CN1480783A - Lens optical shutter means - Google Patents

Abstract

A lens shutter system has an inner drive ring which is rotated by a drive motor and an outer drive ring which is rotated by the drive motor. A plurality of shutter blades of the lens shutter system are driven through drive pins of the inner drive ring and drive pins of the outer drive ring so as to be opened and closed or are rotatably supported by the respective pins of the rings. Upon shutter opening, only the inner drive ring is driven clockwise to open the shutter blades. Upon shutter closing, only the outer drive ring is similarly driven clockwise to close the shutter blades. As mentioned above, upon switching between shutter opening mode and shutter closing mode, the direction of rotation of the inner and outer drive rings is not changed. Thus, the shutter operation can be performed at high speed.

Description

Lens shutter apparatus

Technical field

The present invention relates to the structure of front shutter.

Background technology

With regard to front shutter in the past,,, after above-mentioned shutter is temporarily moved to open position, must carry out antiport along closing direction at once and drive in the occasion of the switching of carrying out shutter being fit to adopt in the type of 1 group of scallop of carrying out driven for opening and closing.So, be difficult in order to carry out above-mentioned reverse rotation action, and realize the switching of above-mentioned scallop apace.

As the type of the speed of the front shutter that improves the above-mentioned past, in the real public clear 45-26780 document of JP etc. disclosed front shutter be fit to adopt open with scallop with close 2 groups of rotatable scallop using scallop.In this front shutter, because when the shutter on-off action, make respectively to open and only move with closing along a direction opening direction and closing direction with scallop with scallop, so do not carry out above-mentioned reverse rotation action, owing to do not produce the time lag of causing thus, so but shutter high speed motion.

In addition, disclosed aperture device has a plurality of scallop of rotating driving for the switching of carrying out aperture in the flat 6-43520 document of TOHKEMY, the rotating center section of above-mentioned scallop rotatably is supported on the fulcrum post of cover plate, is arranged at sliding pin on the end of above-mentioned scallop and slidably embeds in the slotted hole of the fanning strip that rotation drives.The position of above-mentioned fulcrum post and sliding pin is arranged at the position of clamping aperture openings.Drive above-mentioned fanning strip by rotation, above-mentioned scallop rotation, aperture changes.

In the real public clear 45-26780 document of above-mentioned Japan in the disclosed front shutter, if rotation drives scallop, and acquisition is the opening at center with the optical axis, and then minimum needs are respectively applied for 2 scallop opening and be used to close, the quantity of scallop increases, complex structure.If be equipped with aperture separately, then the quantity of scallop further increases.Also but the dual-purpose aperture is used and the scallop of closing usefulness, and still, it is just round that opening shape is approached, and scallop quantity still increases, and still is difficult to high speed motion.

Disclosed aperture device is used for the occasion of front shutter in considering the flat 6-43520 document of above-mentioned TOHKEMY, in order to realize the switching of shutter, must be from opening direction, towards closing direction, resisting in the kinergety of opening direction, above-mentioned fanning strip with this kinergety is carried out reverse rotation drive, necessarily require very large energy, shutter is difficult to high speed motion.

The flat 4-44253 of Jap.P. discloses a kind of iris apparatus, this iris apparatus adopts inside and outside two frameworks to drive and is connected two aperture blades between the framework, by relatively rotating between the internal and external frame aperture blades is rotated, aperture is opened or closed.In this scheme, alternately drive internal and external frame by a motor, make the equidirectional alternately rotation of two frameworks, thereby make the aperture blades open and close alternately between two frameworks.Though this scheme is applied on the aperture, because it can realize the open and close of aperture with unidirectional rotation, having overcome needs to make shutter alternately to rotate the defective of the action of the opening and closing that could realize shutter on opposite both direction in the aforementioned prior art, but itself also exists the some shortcomings part:

1) though the scheme of the flat 4-44253 of Jap.P. only adopts a drive unit to drive inside and outside two frameworks, structurally seem simple, but rotate owing to need make a motor can alternately drive two frameworks, its attachment device that adopts is but very complicated, thereby causes its complexity on one-piece construction.

2) in this scheme, shown in Fig. 3 and 4, carrying out driven by a motor is to satisfy condition simultaneously and just can make motor alternately drive internal and external frame to rotate at the position matching that is respectively tooth portion and toothless portion) on its outer peripheral face and groove pin 1b stroke and these three matching relationships of matching relationship between the size that tooth portion and toothless portion) are arranged on the outer peripheral face of two frameworks in deep-slottedchip breaker 3b by the slip cooperating relationship among the deep-slottedchip breaker 3b of groove pin 1b onoutside framework 3 on theinner frame 1 and two frameworks, any one matching relationship does not satisfy condition, then can cause this whole device not work, therefore the structure of this complexity is very easy to break down at work.

3) in this scheme, owing to need accurate cooperation between each parts, it has a higher requirement in shape each parts, and these parts also need high dimension precision, so that cooperatively interact, this has just increased the difficulty of processing of making these parts.For example, need to produce respectively on the outer peripheral face of two frameworks the shape that tooth portion and toothless portion) replace, this itself just than making full-depth tooth shape complexity, and it also requires two flute profile sizes between the framework to cooperatively interact, this has just increased manufacture difficulty widely.

4) in this scheme, not only make complexity, and maintenance in use is also complicated, and the life-span of this structure is shorter.Because the driven wheel of two frame requirements motors is breaking away from the engagement with the tooth portion of a framework, just begin to begin engagement with the tooth portion of another framework, and the easiest wearing and tearing of end tooth of tooth portion, cause not matching and can't work on the size, therefore, even safeguard that often its life-span is also shorter.

5) in this scheme, there are the factors of instability in the work of its iris apparatus.When the output gear of motor when the state with the tooth portion engagement of a framework transfers engagement with another framework to, control and the out-of-gear framework transfixion of output gear by ratchet spring, and the kinetic energy of framework when high speed rotating is bigger, and the kinetic energy when low speed rotation is less, like this, be difficult to set control, cause fault easily all suitable ratchet spring of all rotating speeds.

Summary of the invention

The present invention proposes in order to solve the above problems, the object of the present invention is to provide a kind ofly to have simple composition, but the structure of the lens shutter apparatus of high speed motion.

The present invention can overcome the shortcoming that needs to make the shutter back and forth movement could switching station to cause in the prior art, can high speed motion by adopting equidirectional rotating manner, and can overcome again by a drive unit simultaneously and drive the labyrinth that is caused.

The present invention is achieved through the following technical solutions:

A kind of shutter device, this shutter device is provided with:

The first and second ring rotation parts, two ring rotation parts are provided with one heart and are concentric with the optical axis of photography light beam;

A plurality of blades, it is around the optical axis setting of photography light beam, one end of blade is articulated on the ring rotation parts, the other end is slidingly connected on another ring rotation parts, the inboard of each blade all is provided with the opening edge portion of a part that forms fast door opening, and each opening edge portion makes up mutually to open or close fast door opening;

First and second drive units drive the equidirectional rotation of the first and second ring rotation parts respectively.

Among the present invention, it does not make the blade antiport in shutter opening action and closing motion, and this blade is constituted along the mode of a direction rotation, and shutter can carry out on-off action at high speed.And, simplified the fit structure between the two ring rotation parts, thereby simplified one-piece construction widely by adopting two drive units.Particularly, adopt two drive units to drive two ring rotation parts respectively, this each self-driven mode, motion between two parts is not conditioned each other, its forms of motion can be realized by the controlling and driving parts, thereby can realize several working ways, and not be subjected to the influence of the structure between the ring rotation parts.And the relativeness between the size of each parts is simple, as long as can roughly cooperate, makes simply, and is not easy to break down, and the life-span is longer.

Preferably, in described shutter device, described drive unit is a motor driver, and it comprises motor and output gear, is provided with outer toothed portion in the periphery of described ring rotation parts; Outer toothed portion engagement on this output gear and the ring rotation parts.

In above-mentioned shutter device, described outer toothed portion is arranged on the part excircle or whole excircle of ring rotation parts.

Preferably, in described shutter device, described drive unit is the elastic drive device, it comprises opener, flexible member and resetting-mechanism, and an end of this flexible member is connected on the pedestal, and the other end is connected on the ring rotation parts, this flexible member is when opener is closed, be in energy accumulating state, described opener is used to discharge the energy accumulating state of flexible member, and described resetting-mechanism is used to make flexible member to be returned to energy accumulating state.

In above-mentioned shutter device, described resetting-mechanism includes stirs ring, and this is stirred ring and is provided with plectrum, the corresponding jut of conflicting with described plectrum that is provided with on the ring rotation parts, rotate this and stir the moving plectrum of endless belt and stir jut, ring rotation parts backward rotation is resetted.

At described shutter device, described opener includes first clutching member that is arranged on the ring rotation upper-part and second clutching member that is arranged on the described pedestal, and this first, second clutching member is controlled its clutch by electromagnetic force or by the machinery engaging.Preferably, described first, second clutching member is respectively electromagnet and iron plate portion.

In described shutter device, this shutter device also includes range controlling mechanism, is used to control the rotational travel of the first and second ring rotation parts.

Preferably, on described first, second ring rotation parts respectively correspondence be provided with two or more backstop protuberances, the backstop protuberance on the two ring rotation parts is spacing mutually, constitutes described range controlling mechanism.

Preferably, described motor is a stepper motor, and this stepper motor and the control device of controlling its rotational angle thereof constitute described range controlling mechanism.

In described shutter device, an end of blade is provided with pin or circular hole, is provided with corresponding circular hole or pin on the corresponding annular rotary part, constitutes the hinged of blade and corresponding annular rotary part; Described blade and being slidingly connected of corresponding annular rotary part are set to, and are provided with pin on one in blade and corresponding annular rotary part, and another is provided with corresponding slotted hole or chute.Thereby realize the rotation of blade between two ring rotation parts.

Description of drawings

Fig. 1 is the skeleton view of the lens shutter apparatus of the 1st embodiment of the present invention;

Fig. 2 is the decomposition diagram of the lens shutter apparatus of above-mentioned Fig. 1;

Fig. 3 be the A of lens shutter apparatus of above-mentioned Fig. 1 to view, the full-shut position in its expression on-off action state;

Fig. 4 be the A of lens shutter apparatus of above-mentioned Fig. 1 to view, the open state midway in its expression on-off action state, or set open state;

Fig. 5 be the A of lens shutter apparatus of above-mentioned Fig. 1 to view, the full-gear in its expression on-off action state;

Fig. 6 for the A of lens shutter apparatus of the above-mentioned Fig. 1 of expression to view, the open state midway in its expression on-off action state, or set open state;

Fig. 7 be the A of lens shutter apparatus of above-mentioned Fig. 1 to view, the full-shut position in its expression on-off action state;

Fig. 8 be the A of lens shutter apparatus of above-mentioned Fig. 1 to view, the shutter close state behind the setting opening in its expression on-off action state;

Fig. 9 is the skeleton view of the lens shutter apparatus of the 2nd embodiment of the present invention that watches from front side;

Figure 10 is the skeleton view of the lens shutter apparatus of above-mentioned Fig. 9 of watching from rear side;

Figure 11 is the decomposition diagram of the lens shutter apparatus of Fig. 9 of seeing from front side;

Figure 12 is the decomposition diagram of the lens shutter apparatus of Fig. 9 of seeing from rear side;

Figure 13 be the B of Figure 11 of lens shutter apparatus of Fig. 9 to view, the initial full-shut position in its expression on-off action state;

Figure 14 be the C of Figure 11 of lens shutter apparatus of Fig. 9 to view, the initial full-shut position in its expression on-off action state;

Figure 15 is the cut-open view along the E-E line of Figure 11 of the lens shutter apparatus of Fig. 9, the initial full-shut position in its expression on-off action state;

Figure 16 be the B of Figure 11 of lens shutter apparatus of Fig. 9 to view, the full-shut position in its expression on-off action state;

Figure 17 be the C of Figure 11 of lens shutter apparatus of Fig. 9 to view, the full-shut position in its expression on-off action state;

Figure 18 is the cut-open view along the E-E line of Figure 11 of the lens shutter apparatus of Fig. 9, the full-shut position in its expression on-off action state;

Figure 19 be the C of Figure 11 of lens shutter apparatus of Fig. 9 to view, the state the when opening action in its expression on-off action state begins;

Figure 20 is the cut-open view along the E-E line of Figure 11 of the lens shutter apparatus of Fig. 9, the state the when opening action in its expression on-off action state begins;

Figure 21 be the C of Figure 11 of lens shutter apparatus of Fig. 9 to view, the state in the opening procedure in its expression on-off action state;

Figure 22 is the cut-open view along the E-E line of Figure 11 of the lens shutter apparatus of Fig. 9, the state in the opening procedure in its expression on-off action state;

Figure 23 be the B of Figure 11 of lens shutter apparatus of Fig. 9 to view, the full-gear in its expression on-off action state;

Figure 24 be the C of Figure 11 of lens shutter apparatus of Fig. 9 to view, the full-gear in its expression on-off action state;

Figure 25 is the cut-open view along the E-E line of Figure 11 of the lens shutter apparatus of Fig. 9, the full-gear in its expression on-off action state;

Figure 26 be the C of Figure 11 of lens shutter apparatus of Fig. 9 to view, the state in the locking process in its expression on-off action state;

Figure 27 is the cut-open view along the E-E line of Figure 11 of the lens shutter apparatus of Fig. 9, the state in the locking process in its expression on-off action state;

Figure 28 be the C of Figure 11 of lens shutter apparatus of Fig. 9 to view, the state before the locking in its expression on-off action state;

Figure 29 is the cut-open view along the E-E line of Figure 11 of the lens shutter apparatus of Fig. 9, the state before the locking in its expression on-off action state;

Figure 30 be the C of Figure 11 of lens shutter apparatus of Fig. 9 to view, the full-shut position in its expression on-off action state;

Figure 31 is the cut-open view along the E-E line of Figure 11 of the lens shutter apparatus of Fig. 9, the full-shut position in its expression on-off action state;

Figure 32 be the C of Figure 11 of lens shutter apparatus of Fig. 9 to view, the shutter full cut-off in its expression on-off action state, load condition;

Figure 33 is the cut-open view along the E-E line of Figure 11 of the lens shutter apparatus of Fig. 9, the shutter full cut-off in its expression on-off action state, load condition;

Figure 34 be the C of Figure 11 of lens shutter apparatus of Fig. 9 to view, the setting aperture openings state in its expression on-off action state;

Figure 35 is the cut-open view along the E-E line of Figure 11 of the lens shutter apparatus of Fig. 9, the setting aperture openings state in its expression on-off action state;

Figure 36 be the C of Figure 11 of lens shutter apparatus of Fig. 9 to view, the full-shut position in its expression on-off action state;

Figure 37 is the cut-open view along the E-E line of Figure 11 of the lens shutter apparatus of Fig. 9, the full-shut position in its expression on-off action state.

Embodiment

Below with reference to the accompanying drawings, embodiments of the invention are described.

Fig. 1 is the skeleton view of the lens shutter apparatus of the 1st embodiment of the present invention, and Fig. 2 is the decomposition diagram of above-mentioned lens shutter apparatus.The figure of the on-off action state of the lens shutter apparatus that Fig. 3～8 expression is represented to view by the A of Fig. 1, Fig. 3 represents full-shut position, open state midway behind the state of Fig. 4presentation graphs 3, or, set open state, the full-gear behind the state of Fig. 5presentation graphs 4, Fig. 6 is the open state midway behind the state of Fig. 5, or, set open state, the full-shut position behind the state of Fig. 7 presentation graphs 6.Fig. 8 is the figure of the shutter close state behind the expression setting opening.In addition, in the description of each embodiment below, the light incident side of projected light is a front side.In addition, the sense of rotation of sense of rotation for watching from photographed side (the A direction of Fig. 1) refers to the rotation of D1 direction around clockwise direction, around the rotation that counterclockwise refers to the D2 direction.

Thelens shutter apparatus 1 of present embodiment mainly comprisesinner drive ring 2,outer driving ring 3, andblade 11,12,13 is as the CD-ROM drive motor 14 and 15 of step motor.

Above-mentionedinner drive ring 2 comprises: be the fast door opening 2a at center with optical axis O; The2nd drive pin 4,5,6, thisdrive pin 4,5,6 is according to towards the front, along being arranged at the foreign side position of fast door opening 2a with the outstanding mode of the parallel direction of optical axis O; 3jut 2b, these 3jut 2b are atdrive pin 4,5, and 6 support position is side-prominent towards periphery;Gear part 2e, thisgear part 2e is arranged at the peripheral part rear.In addition, the right flank of above-mentioned eachjut 2b (from the place ahead) forms surface ofcontact 2c, and the left surface of above-mentioned eachjut 2b (from the place ahead) forms surface ofcontact 2d.

Above-mentionedouter driving ring 3 comprises:fitting portion 3a, and thisfitting portion 3a is for being the opening at center with optical axis O, the peripheral part ofinner drive ring 2 rotatably embeds thisfitting portion 3a inside; The1st drive pin 7,8,9, thisdrive pin 7,8,9 is according to towards the front, along being arranged at the outer fix of fast door opening 2a with the outstanding mode of the parallel direction of optical axis O; Surface ofcontact 3c, 3d, this surface ofcontact 3c, 3d is formed atdrive pin 7,8, the left and right side (from the front) of 9 support position; 3 circular-arc recess 3b, these 3recess 3b are positioned at surface ofcontact 3c, between the 3d, and alongdrive pin 7,8, the circumferencial direction setting between 9;Gear part 3e, thisgear part 3e is arranged at peripheral part.

Above-mentionedouter driving ring 3 is supporting by driving ring support unit (not shown) around the mode of the center of optical axis O rotation, and above-mentionedinner drive ring 2 is supporting byouter driving ring 3 around the mode of the center of optical axis O rotation.

Above-mentionedblade 11 comprises slottedhole 11b, and above-mentioneddrive pin 4 slidably embeds among this slottedhole 11b, and this slottedhole 11b forms the 2nd rotation center; Pin-and-hole 11c, above-mentioneddrive pin 7 rotatably embed among this pin-and-hole 11c, and this pin-and-hole 11c forms the 1st rotation center; The 11a of opening edge portion, the 11a of this opening edge portion is arranged between slottedhole 11b and the pin-and-hole 11c, forms the part of fast door opening.

Above-mentionedblade 12 comprises slottedhole 12b, and above-mentioneddrive pin 5 slidably embeds among this slottedhole 12b, and this slottedhole 12b forms the 2nd rotation center; Pin-and-hole 12c, above-mentioneddrive pin 8 rotatably embed among this pin-and-hole 12c, and this pin-and-hole 12c forms the 1st rotation center; The 12a of opening edge portion, the 12a of this opening edge portion forms the part of fast door opening.

Above-mentionedblade 13 comprises slottedhole 13b, and above-mentioneddrive pin 6 slidably embeds among this slottedhole 13b, and this slottedhole 11b forms the 2nd rotation center; Pin-and-hole 13c, above-mentioneddrive pin 9 rotatably embed among this pin-and-hole 13c, and this pin-and-hole 13c forms the 1st rotation center; The 13a of opening edge portion, the 13a of this opening edge portion forms the part of fast door opening.

Above-mentionedrespective drive pin 4,5,6 and above-mentioned corresponding slottedhole 11b, 12b, 13b can do to slide relatively along the long axis direction of above-mentioned these slotted holes.

Be fixed in thegear part 2e engagement inpinion wheel 16 and theinner drive ring 2 on the output shaft of above-mentioned CD-ROM drive motor 14, in addition, thepinion wheel 17 that is fixed on the output shaft of above-mentioned CD-ROM drive motor 15 meshes withgear part 3e in theouter driving ring 3.

In thelens shutter apparatus 1 of present embodiment with above-mentioned scheme, can carry out the control action that various front shutters open and close, below by Fig. 3～8, wherein the 1st shutter control action is described.

Be suitable under the occasion of the 1st shutter control action,, additionally adopt iris apparatus simultaneously with respect to lens shutter apparatus.In this shutter control action, make the said aperture device be in the aperture settings state of regulation, shutter full-shut position from Fig. 3, the state that stops in CD-ROM drive motor 15, around counterclockwise driving CD-ROM drive motor 14, only makeinner drive ring 2 along D1 direction (around clockwise direction), rotation drives predetermined angular.The rotation of the D1 direction by above-mentionedinner drive ring 2, above-mentionedjut 2b slides onrecess 3b,drive pin 4,5,6 is that the center rotatablely moves with optical axis O.By this rotation,blade 11,12,13 respectively withdrive pin 7,8,9 (that is, and pin-and-hole 11c, 12c, 13c) for the center rotates, simultaneously, corresponding pin-and-hole 11c, 12c, the relativecorresponding driving pin 7,8,9 of 13c and moving.So, form shutter shown in Figure 4 opening Pa midway.

In addition, iff makinginner drive ring 2 along D1 direction (around clockwise direction), rotation drives predetermined angular, and is then identical with above-mentioned situation,blade 11,12,13 withdrive pin 7,8,9 are rotated continuously for the center, as shown in Figure 5, the surface ofcontact 2c of thejut 2b ofinner drive ring 2 contacts with surface ofcontact 3c in theouter driving ring 3, is in the shutter full-gear that fast door opening 2a (standard-sized sheet mouth Pb) is opened.So, CD-ROM drive motor 14 is stopped.

Then, for through regulation second number, be in the shutter close state, at the state that CD-ROM drive motor 14 is stopped, drive CD-ROM drive motor 15 around rotation counterclockwise, only makeouter driving ring 3 along D1 direction rotation predetermined angular, at this moment, drivepin 7,8,9 is that the center rotatablely moves with optical axis O.Follow this rotation,blade 11,12,13 respectively withdrive pin 4,5,6 (that is, and slottedhole 11b,12b 13b) is the center rotation, simultaneously, corresponding pin-and-hole 11c, 12c, the relativecorresponding driving pin 7,8,9 of 13c and moving.So, be in the state of the Pc of opening midway that is shown in Figure 6.

Then, drivingring 3 further drives with the predetermined angular rotation along D1 direction (around clockwise direction) outside making, thenblade 11,12,13 carry out continuously withdrive pin 4,5,6 is the rotation at center, as shown in Figure 7, the surface ofcontact 3d in theouter driving ring 3 contacts with surface ofcontact 2d in theinner drive ring 2, is in the shutter close state.So, CD-ROM drive motor 15 is stopped.

Then, carry out the occasion that shutter opens and closes once more, carrying out above-mentioned Fig. 3～drive controlling action shown in Figure 7 repeatedly.

The 2nd shutter control action to the 1stlens shutter apparatus 1 is described below.

In above-mentioned the 1st shutter control action, in making respectively,outer driving ring 2,3 rotates along D1 direction (around clockwise direction) as shown in Fig. 4 waits, but, in the action of the 2nd shutter open and close controlling, outside making respectively,inner drive ring 3,2 along D2 direction (around counterclockwise changeing) rotation, carries out the switching of shutter.That is, can makeouter driving ring 3 along the rotation of D2 direction, from the shutter close state of Fig. 7, through the open state midway of Fig. 6, be in the full-gear of Fig. 5, then,inner drive ring 2 rotated along the D2 direction, from the shutter open mode of Fig. 5,, be in the full-shut position of Fig. 3 through the open state midway of Fig. 4.

Below, the 3rd shutter control action of thelens shutter apparatus 1 of above-mentioned the 1st embodiment is described.

Also have, in the occasion that is fit to adopt the 3rd shutter control action, becauselens shutter apparatus 1 has the aperture function, so iris apparatus needn't be set in addition.

This shutter open and close controlling action is controlled in the following manner, and this mode is: the open state of blade arrives the setting aperture openings state of regulation, then, from opening action, switches to closing motion.At first, from shutter close state shown in Figure 3, only makeinner drive ring 2 along D1 direction (around clockwise direction), rotation drives predetermined angular.Follow the rotation of above-mentionedinner drive ring 2,blade 11,12,13 respectively withdrive pin 7,8, and 9 for the center rotates, and the shutter of Fig. 4 that is in the setting aperture state of regulation is set the state of opening Pa.So,inner drive ring 2 is stopped, then, along the D1 direction, rotation drives outer driving ring 3.Follow the rotation of above-mentionedouter driving ring 3,blade 11,12,13 withdrive pin 4,5, and 6 for the center rotates, and is in shutter close state shown in Figure 8.

Afterwards,,, still makeinner drive ring 2, then, makeouter driving ring 3, carry out the switching of shutter along the rotation of D1 direction along the rotation of D1 direction from the state of Fig. 8 in the occasion of carrying out the shutter on-off action once more.

As above-mentioned, be fit to adopt the above-mentioned the 1st at thelens shutter apparatus 1 of the 1st embodiment, the occasion of 2 shutter control actions, from the shutter opening action, when switching to closing motion, in needn't carrying out,outer driving ring 2, the reverse spinning movement of 3 driver part thus, can be carried out the on-off action of shutter number second at a high speed.In addition, because forblade 11,12,13, be equidirectional (D1 direction during at opening action and during closing motion around the sense of rotation component of the center of gravity of corresponding blade, or D2 direction), so compare, can move at high speed with the mechanism of the lens shutter apparatus in the past of the round action of blade when opening and closing.

Particularly, in the occasion that is fit to adopt the 3rd above-mentioned shutter control action, owing to need not iris apparatus, so the composition of the exposure device of camera is simple.

In addition, thelens shutter apparatus 1 of above-mentioned the 1st embodiment is fit to adopt 2 CD-ROM drive motor 14,15, but is not limited thereto, and it also can constitute like this,, by clutch coupling, switches forward and reverse rotation of 1 CD-ROM drive motor that is, makes 2,3 rotations of 2 driving rings respectively.

In addition, CD-ROM drive motor is fit to adopt step motor, still, if the sensor that detects rotation amount is set, then also can be fit to adopt common direct current (DC) motor.

Then, at the shutter control action of above-mentioned the 1stlens shutter apparatus 1, the control action beyond above-mentioned the 1st, 2,3 the shutter control action is described.

The 4th shutter control action refers to alternately carry out the above-mentioned the 1st and the 2nd shutter control action, realizes the switching of shutter.At first, according to aforesaid the 1st shutter control action, makeinner drive ring 2 along the rotation of D1 direction, from the shutter close state of Fig. 3, rotation is driven into the open mode of Fig. 5.In addition, along the D1 direction, makeouter driving ring 3 rotations, from the shutter open mode of Fig. 5, rotation is driven into the closed condition of Fig. 7.

In addition, when proceeding the shutter switching, according to above-mentioned the 2nd shutter control action, makeouter driving ring 3 along reverse D2 direction rotation, blade is from the closed condition of Fig. 7, and rotation is driven into the open mode of Fig. 5.In addition, makeinner drive ring 2,, change to the closed condition of Fig. 7 from the shutter open mode of Fig. 5 along the rotation of D2 direction.

In the occasion that is fit to adopt the 4th shutter control action, in shutter on-off action once, in not making,outer driving ring 2,3 reverse rotations drive equally, and shutter can move at high speed.

In addition, in needn't making,outer driving ring 2,3 revolves and turns around, and can will be arranged at the gear part of the periphery of outer driving ring, only is located at 1 part of periphery.So, in the occasion that is fit to adopt the 4th shutter control action, other portion of mechanism can be arranged at this gear part outer peripheral portion in addition, can form lens shutter apparatus compactly.In addition,, also can constitute like this be fit to adopting the occasion of this shutter control action, that is, in,outer driving ring 2,3 is along bidirectional-movement, still, still can be with 1 CD-ROM drive motor as drive source, by clutch coupling, in the driving,outer driving ring 2,3.

The 5th shutter control action to above-mentioned the 1st lens shutter apparatus is described below.

In the above-mentioned the 1st～4 shutter control action, when the shutter standard-sized sheet moves, or shutter is when setting the opening action, make the CD-ROM drive motor 14 of opening driving, or 15 stop, but in the 5th shutter control action, in the time must continuing above-mentioned shutter standard-sized sheet or shutter setting open state, control like this, promptly with the stipulated time, do not make and carry out the above-mentioned CD-ROM drive motor 14 of opening driving, or 15 stop, and in addition, makes another CD-ROM drive motor 15, or 14 start, and constant speed ground drives these two CD-ROM drive motor.By controlling and driving motor so, can make above-mentioned shutter standard-sized sheet, or shutter is set the state continuance required time of opening.

Through after the stipulated time, make and carried out the above-mentioned CD-ROM drive motor 14 of opening driving, or 15 stop, making another CD-ROM drive motor 15, or 14 continuous drive same as before, carry out closing motion, when full cut-off, also make above-mentioned CD-ROM drive motor 15, or 14 stop.

According to the 5th shutter control action, because with certain time more than certain second number,blade 11,12,13 opening shape rotates same as before, so exposure is averaged processing, can obtain not have anisotropic fuzzy, can obtain to pass through bluring that equalization is handled, the not fuzzy sense of printing.

Lens shutter apparatus to the 2nd embodiment of the present invention is described below.

Fig. 9,10 is the skeleton view of the lens shutter apparatus of above-mentioned the 2nd embodiment, the figure of Fig. 9 for seeing from front side, the figure of Figure 10 for seeing from rear side.Figure 11,12 is the decomposition diagram of above-mentioned lens shutter apparatus, the figure of Figure 11 for seeing from front side, the figure of Figure 12 for seeing from rear side.Figure 13～37 are the figure of the on-off action state of the above-mentioned lens shutter apparatus of expression.Figure 13,16,23 be the B of Figure 11 to view, in addition, Figure 14,17,19,21,24,26,28,30,32,34,36 is that the C of Figure 11 is to view, in addition, Figure 15,18,20,22,25,27,29,31,33,35,37 are the figure of expression by each on-off action state of the lens shutter apparatus represented along the cut-open view of the E-E line of Figure 11.In addition, the above-mentioned Figure 13～initial full-shut position of 15 expressions, the full-shut position after above-mentioned Figure 16～18 expression aperture settings.Above-mentioned Figure 19, the state when 20 expression shutter opening actions begin, Figure 21, the state in the 22 expression shutter opening procedures, Figure 23～25 expression shutter full-gears.In addition, above-mentioned Figure 26, the state in the 27 expression shutter lock closed procedures, above-mentioned Figure 28, the state before the 29 expression shutter lockings, above-mentioned Figure 30,31 expression shutter full-shut positions.Above-mentioned Figure 32,33 expression shutter full cut-offs, load condition.Above-mentioned Figure 34,35 expressions are in the open state of the shutter setting aperture of regulation aperture state, above-mentioned Figure 36, the above-mentioned shutter of 37 expressions is set the shutter full-shut position after aperture is opened.

Thelens shutter apparatus 21 of present embodiment encircles 23 as opening of the 1st rotary driving part, as theclosed loop 24 of the 2nd rotary driving part mainly bybase plate 22;Blade 27,28,blade pressing tablet 25,aperture ring 26, the CD-ROM drive motor 51 as step motor that is connected withgear case 52 constitutes.

Above-mentionedbase plate 22 is fixedly attached on the camera body (not shown), and portion hasopening 22a therebetween, in its front face side, be equipped with as the shutter of clapper type (absorption type) electromagnet and open withelectromagnet 41, shutterclose electromagnet 42, in addition, be provided withdrive pin 22b, 22c is at thisdrive pin 22b, on the 22c, be hung with andopen spring 43, close spring 44.In addition, trickle adjustment can be carried out in the installation site of above-mentionedelectromagnet 41,42, according to when being in the shutter close state, opening of will describing in the back encircles 23, or theiron plate portion 29 of closedloop 24,30adsorption plane 29a, the mode that 30a fits tightly is carried out fine adjustments.

The above-mentionedring 23 of opening is being supported on the camera body (not shown) around the mode of optical axis O rotation.This opensring 23 at pars intermedia, hasopening 23a, and side is provided withiron plate portion 29 in the back, thisiron plate portion 29 is formed by magnetic, hasadsorption plane 29a, and side is provided withgathering sill 23b in front, 23c on the peripheral side of the outstanding jut of foreign side, is provided with surface ofcontact 23d, 23e.In addition, an end of openingspring 43 hangs on to be opened on thering 23, opensring 23 in the load condition of openingspring 43, makes it along D1 direction (watching from the place ahead, around clockwise direction) rotation biasing.

Above-mentionedclosed loop 24 has embeddedhole 24a, and this embeddedhole 24a rotatably with above-mentioned to openring 23 periphery chimeric, rotatably is supported on above-mentioned opening on the ring 23.On thisclosed loop 24, side is provided withiron plate portion 30 and surface ofcontact 24b in the back, 24c, and thisiron plate portion 30 is formed by magnetic, haveadsorption plane 30a, this surface ofcontact 24b, 24c circumferentially is provided with along the back side, in front side, be provided withdrive pin 31,32, thisdrive pin 31,32 is outstanding along optical axis O.In addition, an end of closingspring 44 hangs on theclosed loop 24, in the load condition of closingspring 44, makes this closed loop along D1 direction (watching from the place ahead, around clockwise direction) rotation biasing.

Above-mentionedblade 27,28 comprises the 27a of opening edge portion that forms fast door opening respectively, 28a; Pin-and-hole 27b, 28b, this pin-and-hole 27b, 28b are the 1st rotation center, above-mentioneddrive pin 31,32 rotatably embeds this pin-and-hole 27b, among the 28b;Drive pin 33,34, thisdrive pin 33,34 is side-prominent towards the back, is the 2nd rotation center, can be at gatheringsill 23b, the direction along this groove among the 23c is slided, and embeds in this gathering sill in the mode of rotatable slip.Thisblade 27,28 is bydrive pin 31, or 32 andgathering sill 23b, or 23c, by openingring 23 and closedloop 24 drives, in optical axis O rotation, carries out shutter and opens and closes rotation and drive.

Above-mentionedblade pressing tablet 25 is the parts that move of the optical axis O direction ofrestriction blade 27,28, and according to having fast door opening 25a at the place, centre, the mode that drivepin 31,32embeds 2 pin-and-hole 25b is installed, and drives with 24 one-tenth whole rotations of closed loop.

Saidaperture ring 26 rotatably is supported on the camera body (not shown).On thisaperture ring 26, have opening 26a at pars intermedia, on the part of periphery, be provided withgear part 26c, circumferential along the rear side teat, surface ofcontact 26b is set, forwardly, have 7outstanding pins 35 along optical axis O.Respectively sell on 35 above-mentioned, rotatably be supported with the aperture blades (not shown) respectively.If before shutter opens and closes, by CD-ROM drive motor 51,drive aperture ring 26 with the predetermined angular rotation, then rotation drives the said aperture blade, sets the opening (not shown) of the f-number of regulation.

The shutter control action that shutter in thelens shutter apparatus 21 of the 2nd embodiment with such scheme is opened and closed usefulness is described below.

The original state of this shutter control action refers to as shown in Figure 13～15, makeaperture ring 26 along the D2 direction (around counterclockwise, but, in Figure 15, around along clockwise direction) state of rotary-cut, by the surface ofcontact 26b ofaperture ring 26, push the surface ofcontact 23e that opensring 23, and by opening the surface ofcontact 23d ofring 23, push the surface ofcontact 24c of closedloop 24, above-mentioned 3rings 26,23,24 rotate to ironplate portion 29,30adsorption plane 29a, the adsorption plane 41a of 30a andelectromagnet 41,42,42a position contacting (Figure 15).In addition,close spring 44 and open the state that spring 43 remains on load.In addition, the said aperture blade remains on minimal openings, or full-shut position.This state keeps by the cogging torque (cogging torque) of motor.

From above-mentioned original state, the shutter on-off action of exposure usefulness during shooting that beginning provides below.That is, when the shutter on-off action begins,,, be in the adsorbed state ofiron plate portion 29,30 toelectromagnet 41,42 energisings in above-mentioned 3 occasions that ring 26,23,24 is in the state of Figure 15.In addition, the occasion in adsorptingiron plate portion 29,30 is even be waiting status, betweenelectromagnet 41,42 andiron plate portion 29,30, because of factors such as vibrations, produce under the situation in gap, follow the initial spinning movement of the D2 direction of above-mentionedaperture ring 26, by the surface ofcontact 26b ofaperture ring 26, push andopen ring 23, and closedloop 24, thus, remain on the adsorption plane state very close to each other of above-mentionediron plate portion 29,30, really above-mentionediron plate portion 29,30 is adsorbed on theelectromagnet 41,42.

In the occasion of carrying out the action of shutter standard-sized sheet, makeaperture ring 26 along D1 direction (around clockwise direction) rotation, the aperture blades (not shown) is set in the state (Figure 16) of setting f-number.Blade 27,28 keeps closed condition (Figure 17), andelectromagnet 41,42 keeps adsorbed state (Figure 18).

So if stop to open the energising ofelectromagnet 41, then the magnetic force ofelectromagnet 41 disappears,iron plate portion 29 is discharged, by opening the bias force ofspring 43,open ring 23 along D1 direction rotation (Figure 20).Follow above-mentioned rotation of openingring 23, thedrive pin 33 ofblade 27,28,34 along gatheringsill 23b, and the groove direction of 23c moves among the 23c at guidinggroove section 23b, that is,drive pin 33,34 andgathering sill 23b, 23c relatively moves, and simultaneously they is pushed driving, thisblade 27,28 drive pins 31 with closedloop 24,32 is the center, along the D1 direction, begins opening action (Figure 19) respectively.

Ifopen ring 23 further along D1 direction rotation, thenblade 27,28 is proceeded above-mentioned opening action, and through open state (Figure 21) midway, the surface ofcontact 23e that opensring 23 contacts with the surface ofcontact 26b ofaperture ring 26 and stops.In this halted state,blade 27,28 is by the 27a of opening edge portion, and 28a forms shutter standard-sized sheet mouth (Figure 23,24).Figure 25 represents theiron plate portion 29 of above-mentioned shutter standard-sized sheet mouth state and opens isolated state between theelectromagnet 41.

If behind shutter number second through regulation, interrupt the energising ofelectromagnet 42, then the magnetic force ofelectromagnet 42 disappears,iron plate portion 30 withclose electromagnet 42 and leave, closedloop 24 is in the effect lower edge of the bias force of closingspring 44 D1 direction rotation (Figure 27).Follow above-mentioned rotation, by thedrive pin 31,32 of closedloop 24, makingblade 27,28 is the center withdrive pin 33,34, drive along the rotation of D1 direction, follow this situation, drivepin 33,34 at above-mentionedgathering sill 23b, moves in the groove of 23c, promptly, drivepin 33,34 andgathering sill 23b, 23c relatively moves, meanwhile, beginning shutter close action (Figure 26).

In addition,, pass through Figure 28 if the D1 direction of closedloop 24 is rotated continuously, 29 state, the surface ofcontact 24c of closedloop 24 contacts with the surface ofcontact 23d that opensring 23, and then closedloop 24 stops, and is in shutter full-shut position (Figure 30,31).

Then, from Figure 30,31 full-shut position drives CD-ROM drive motor 51, makeaperture ring 26 along the rotation of D2 direction, byaperture ring 26, push andopen ring 23, by openingring 23, push closedloop 24, make its rotation, turn back to above-mentioned Figure 13, the original state shown in 14 along the D2 direction.When above-mentioned rotation, owing to openingring 23 and closedloop 24, be rotated at not counterrotating state, soblade 27,28 keeps closed conditions, realize rotating.In addition,,, rotate to theadsorption plane 29a ofiron plate portion 29,30 as above-mentioned shown in Figure 15 in original state, the adsorption plane 41a of 30a andelectromagnet 41,42, the 42a position contacting in addition, is closedspring 44 and is openedspring 43 and remain on the state that is in load.

To being described by the action less than the occasion of the regulation shutter open state of the opening of standard-sized sheet, in above-mentioned original state shown in Figure 13, toelectromagnet 41,42 energisings,iron plate portion 29,30 is in adsorbed state withelectromagnet 41,42 below.During before this "on" position, its action is identical with above-mentioned shutter full cut-off action.

At first, makeaperture ring 26 along the rotation of D1 direction, the aperture blades (not shown) is in the state of the setting f-number of regulation.Rotation status at thisaperture ring 26 resembles Figure 32, shown in 33 like that, keep the shutter close state.

So, if interrupt the energisingopen electromagnet 41, thenopen ring 23 under the effect of the bias force of openingspring 43, along the rotation of D1 direction, the surface ofcontact 23e that opensring 23 contacts with the surface ofcontact 26b ofaperture ring 26 and stops.Follow above-mentioned rotation of openingring 23,, push thedrive pin 33 that drivesblade 27,28 by guidinggroove section 23b, 34,blade 27,28 is the center with thedrive pin 31,32 of closedloop 24, along the rotation of D1 direction, rotate to the shutter aperture position (Figure 34,35) of regulation.At this state, the opening diameter ofblade 27,28 is bigger slightly than the opening diameter S1 of aperture blades (not shown).

Then, if behind process regulation shutter number second, the energising of impedingshutdown electromagnet 42, then closedloop 24 is in the rotation of the effect lower edge of the bias force of closingspring 44 D1 direction, and the surface ofcontact 24c of closedloop 24 contacts with the surface ofcontact 23d that opensring 23 and stops.Follow the rotation of above-mentionedclosed loop 24, bydrive pin 31,32, makingblade 27,28 is the center withdrive pin 33,34, drives along the rotation of D1 direction, is in shutter full-shut position (Figure 36,37).

If from above-mentioned shutter full-shut position,aperture ring 26 is rotated along the D2 direction, then openingring 23 and 24 whiles of closed loop rotates along the D2 direction,blade 27,28 remain under the closing state, turn back to above-mentioned Figure 13,14 original state, but the action of this moment is identical with the occasion of above-mentioned shutter standard-sized sheet action.

If adopt thelens shutter apparatus 21 of the 2nd above-mentioned embodiment, identical with the occasion of thelens shutter apparatus 1 of above-mentioned the 1st embodiment, when the shutter opening action switches to closing motion, needn't openclosed loop 23,24 reverse rotation action, thus, can carry out the on-off action of shutter number second at a high speed.Particularly, occasion at present embodiment, by closing motion, form thedrive pin 33 of the rotation center ofblade 27,28,34 with the focus point of blade be approaching from the blade shape aspect, thus, can shorten, switch to the time of closing motion from opening action, owing to this reason, help carrying out the high speed processing of shutter number second equally.

In addition, in thelens shutter apparatus 21 of the 2nd embodiment, because blade is 2, so the opening shape of opening is near oval shape, still midway, because when opening action and during closing motion, the opening rotation meanwhile, realizes opening and closing, so compare with the blade that carries out round spinning movement merely that has in the past, the influence of above-mentioned opening shape is little.

In addition, thelens shutter apparatus 21 of the 2nd embodiment can drive by 1 CD-ROM drive motor 51, needn't adopt clutch coupling etc., forms simple.

In addition, in thelens shutter apparatus 21 of the 2nd embodiment, aperture blades (not shown) andblade 27,28 are set respectively, still, also can be identical with the occasion of above-mentioned the 1st embodiment, make blade have the aperture function, both dual-purposes.At this moment,aperture ring 26 has only opens spring, closes the load of spring and opens ring, the function of the control of the stop position of closed loop.

In addition, in thelens shutter apparatus 21 of the 2nd embodiment, follow the opening diameter of aperture, the stop position of blade is changed, still, the rotation of blade can only be the standard-sized sheet spinning movement.In this occasion, in full-gear, the surface ofcontact 23e that opensring 23 is contacted with the surface ofcontact 24b of closedloop 24, thus, can improve the speed of the closedloop 24 when switching to closing motion from full-gear.

Also have, in thelens shutter apparatus 21 of the 2nd embodiment,, realize the loading of blade, still, the independent load maintainer that is independent of aperture ring mechanism can be set also by the rotation of aperture ring.

Have again, also can form like this, that is, the adsorption plane by theelectromagnet 41,42 in thelens shutter apparatus 21 that changes the 2nd embodiment towards etc., will open ring and closed loop transposing.

In addition, at above-mentioned the 1st embodiment, or in the lens shutter apparatus of the 2nd embodiment, when the shutter on-off action, in the mode that mechanically contacts, in making, outer driving ring is opened, and closed loop stops, but, if constitute like this, promptly, be provided with and detect this contact, or arrive the sensor of this contact relevant position, and carry out following action, then can carry out the control that is fit to more.

In addition, in other words, the lens shutter apparatus in past and lens shutter apparatus of the present invention are as following.

That is, if the tachometer of blade is shown velocity, then can with the perpendicular line of the Plane of rotation of blade on, adopt the value (length) of rotational speed, with the sense of rotation of blade direction as the vector on this line.So, in the lens shutter apparatus in the past, because the motion of opening direction of blade is opposite with the motion of closing direction, so the direction of its vector is just opposite, in contrast, lens shutter apparatus of the present invention is characterised in that with regard to the opening action of blade and closing motion these velocities are the vector of equidirectional.And, in other words, lens shutter apparatus with blade constitutes in the following manner, and this mode is: the rotation velocity vector that blade had the during opening action of above-mentioned blade, the rotation velocity vector that blade had during with closing motion has identical direction.

As above-mentioned, the speed of front shutter on-off action of the present invention improves specifically, depends on from opening action, switches to the shortening of the time of closing motion.Carrying out in the past comes and goes in the mechanism of action, owing to after the blade that makes motion temporarily stops, it is moved in opposite directions, so the raising of speed is restricted.But in device of the present invention, because driver part do not come and go action, and blade itself do not change in the occasion of opening action and closing motion around the sense of rotation of center of gravity, so can switch to and close apace from opening.In addition, carrying out in the past comes and goes in the mechanism of action, if improve the speed of blade itself, owing to be difficult to antiport, so on the whole, speed is less fast, still, in device of the present invention, the load resistance during owing to antiport is less, so can improve the speed of blade itself.

Since as the mechanism of the high speed motion in past, that people propose is multinomial, it is closed and open in the scheme of employing blade separately, owing to there is not the antiport of parts incomplete really, so utilize raising speed, but, it is many that the number of blade becomes, and in addition, mechanism is also complicated.The advantage of device of the present invention is and can realizes the raising of speed by less blade number, can be arranged in the less space.

Claims (11)

1, a kind of lens shutter apparatus, this lens shutter apparatus is provided with:

The first and second ring rotation parts, two ring rotation parts are provided with one heart and are concentric with the optical axis of photography light beam;

A plurality of blades, it is around the optical axis setting of photography light beam, one end of blade is articulated on the ring rotation parts, the other end is slidingly connected on another ring rotation parts, the inboard of each blade all is provided with the opening edge portion of a part that forms fast door opening, and each opening edge portion makes up mutually to open or close fast door opening;

First and second drive units drive the equidirectional rotation of the first and second ring rotation parts respectively.

2, lens shutter apparatus as claimed in claim 1 is characterized in that, described drive unit is a motor driver, and it comprises motor and output gear, is provided with outer toothed portion on the periphery of described ring rotation parts; Outer toothed portion engagement on this output gear and the ring rotation parts.

3, lens shutter apparatus as claimed in claim 2 is characterized in that, described outer toothed portion is arranged on the part excircle or whole excircle of ring rotation parts.

4, lens shutter apparatus as claimed in claim 1, it is characterized in that, described drive unit is the elastic drive device, it comprises opener, flexible member and resetting-mechanism, and an end of this flexible member is connected on the pedestal, and the other end is connected on the ring rotation parts, this flexible member is when opener is closed, be in energy accumulating state, described opener is used to discharge the energy accumulating state of flexible member, and described resetting-mechanism is used to make flexible member to be returned to energy accumulating state.

5, lens shutter apparatus as claimed in claim 4, it is characterized in that, described resetting-mechanism includes stirs ring, this is stirred ring and is provided with plectrum, the corresponding jut of conflicting that is provided with on the ring rotation parts with described plectrum, rotate this and stir the moving plectrum of endless belt and stir jut, ring rotation parts backward rotation is resetted.

6, lens shutter apparatus as claimed in claim 4, it is characterized in that, described opener includes first clutching member that is arranged on the ring rotation upper-part and second clutching member that is arranged on the described pedestal, and this first, second clutching member is controlled its clutch by electromagnetic force or by the machinery engaging.

7, lens shutter apparatus as claimed in claim 6 is characterized in that, described first, second clutching member is respectively electromagnet and iron plate portion.

8. lens shutter apparatus as claimed in claim 1 is characterized in that this shutter device also includes range controlling mechanism, is used to control the rotational travel of the first and second ring rotation parts.

9, lens shutter apparatus as claimed in claim 8, it is characterized in that, on described first, second ring rotation parts respectively correspondence be provided with two or more backstop protuberances, the backstop protuberance on the two ring rotation parts is spacing mutually, constitutes described range controlling mechanism.

10, lens shutter apparatus as claimed in claim 8 is characterized in that, described motor is a stepper motor, and this stepper motor and the control device of controlling its rotational angle thereof constitute described range controlling mechanism.

11, as the described lens shutter apparatus of above-mentioned arbitrary claim, it is characterized in that, one end of blade is provided with pin or circular hole, is provided with corresponding circular hole or pin on the corresponding annular rotary part, constitutes the hinged of blade and corresponding annular rotary part; Described blade and being slidingly connected of corresponding annular rotary part are set to, and are provided with pin on one in blade and corresponding annular rotary part, and another is provided with corresponding slotted hole or chute.

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