CN1093192A - Optical disk reproducing apparatus - Google Patents

Abstract

A kind of lens cleaning device of lens of optical head of optical disk reproducing apparatus, it has: the lens Moving apparatus (25) that makes the cleaning member (21) of object lens (11) contact dumb bids (22) with the focus control mechanism of optical head (4); With with the tracking Control mechanism of optical head, make by described lens Moving apparatus and make the object lens that contact with cleaning member vibrating device (26) along the tracking direction vibration.

Description

Optical disk reproducing apparatus

The present invention relates to have the optical disk reproducing apparatus of lens cleaning device of lens of optical head that cleaning is used for the recorded information of optical regeneration disc.

Recently, the CD of small-sized compact substance dish (CD) (compact disk) etc. popularize quite surprising.The following basically formation of the optical disc apparatus of the recorded information of this disc of photo reversal: on one side CD is supported in rotation on the rotating disk and makes to give that set a distance separates and to move with the optical head of this card face-off radial direction along above-mentioned CD; Regenerate on one side by this optical head irradiating laser and with the reflected light reading and recording information that above-mentioned optical head receives this laser that is caused by the information recording surface that coils.

And CD generally forms with the bit of digitized information representation and forms spiral helicine track record along card and carries out record.Optical head is followed the tracks of the renewable recorded information of track, and the rotation interlock of it and CD also moves along radial direction.At this moment, the object lens of optical head should be controlled and make it move the line focusing of going forward side by side along this optical axis direction with laser focusing on track record, and the object lens of this optical head edge moves forward into line trace control with the direction that track record intersects.

As above carry out the object lens of focus control and tracking Control, usually it is moved freely along optical axis direction with the direction of this direction quadrature and supporting by the elastomeric element in the optical head body.The driving force light with the spy should be able to obtain good control, supports object lens etc. with the elastomeric element that elastic force is more weak, and this supporting structure is very accurate.

In the general environment for use of optical disk reproducing apparatus, pollute because of make objective lens surface unavoidably with dust.So so, wish object lens are regularly cleaned in order to keep the characteristic of optical head.

Yet the supporting structure of above-mentioned object lens has numerous precise parts.For this reason, if be used in reference to direct removing lens face, then excessive loading meeting adds to this holding components, makes existence support the worry that characteristic changes by the elasticity of the object lens of elastomeric element generation.If elasticity supports that characteristic takes place so to change, then the characteristic of focus control and tracking Control changes significantly and loses High Accuracy Control.

This point has been used the dumb bid that cleaning brush is installed on card real opening in the clear 62-57931 communique, has disclosed this dumb bid optical disk reproducing apparatus of packing into is purified the technology of the object lens of optical head.That is, technology shown in this communique is the action of regenerating of a kind of dumb bid of packing into, while the cleaning brush contact object lens that the dumb bid rotation made be installed on it, to reach the effect of cleaning its surface.

Yet in as above constituting, must make the dumb bid rotation for purifying object lens.Like this, if, then or cause and damage the elastomeric element of supporting object lens, or have the worry that makes this elasticity support characteristic degradation while make dumb bid rotation make cleaning brush contact object lens.

And, need long brush hairs to contact to be separated by predetermined distance and the object lens that stand facing each other with card as being installed on cleaning brush on the dumb bid.And the dumb bid of the cleaning brush that becomes mildewed is housed, and its operability is bad sometimes.

The present invention has considered above-mentioned situation and has proposed that its purpose is can not damage the characteristic of optical head, and a kind of optical disc apparatus that has the lens cleaning device with simple structure that can effectively purify these object lens is provided.

The present invention relates to a kind of with optical head be held in the CD that rotates on the rotating disk and stand facing each other mutually and this optical head is moved and the optical disk reproducing apparatus of the recorded information of this CD of photo reversal along above-mentioned CD radial direction;

Relate in particular to and cleaning member is located at dumb bid on the card can props up and be held in a lens cleaning device that makes it on the rotating disk to drive,

It is characterized in that described lens cleaning device has: the lens Moving apparatus that above-mentioned object lens is contacted with the focus control mechanism of above-mentioned optical head with the cleaning member of above-mentioned dumb bid; Make the object lens that contact with above-mentioned cleaning member vibrating device along the vibration of tracking Control direction with the tracking Control mechanism of above-mentioned optical head by this lens Moving apparatus.

And the said lens cleaning device is characterised in that, only moves when dumb bid stops the rotation when adorning dumb bid and only.

According to the present invention who as above constitutes, the object lens that use optical head along focus control mechanism that optical axis direction moves and make above-mentioned object lens along and the tracking Control mechanism that moves of the above-mentioned optical axis direction of intersecting, make object lens when above-mentioned dumb bid is being adorned be located at this dumb bid on cleaning member contact, owing in this state, make object lens along the vibration of card direction, so loading especially is added on the surface that object lens can clean lens effectively.

And owing to object lens self are moved contact cleaning member, and carry out the removing on this surface by vibration, so there is no need specially to make the dumb bid rotation that cleaning member is installed.Therefore, owing in not damaging, make these object lens contact cleaning member gently by the scope of elastomeric element to the support characteristic of object lens, and object lens are vibrated along card, so can effectively and simply carry out this cleaning.

Below, the accompanying drawings embodiments of the invention.

Fig. 1 is the oblique view of the major part summary formation of the optical disk reproducing apparatus of expression one embodiment of the invention;

Fig. 2 is the summary pie graph of the control loop in expression one embodiment of the invention device;

Fig. 3 constitutes the illustration oblique view for the dumb bid that expression is used for one embodiment of the invention device.

In above-mentioned figure, the 1-rotating disk; The 4-optical head; The 11-object lens; The 12-lens mount; 13-cylindrical spring (elastic supporting member); The 14-permanent magnet; The 15-focusing coil; The 16-tracking coil; The 21-cleaning member; The 22-dumb bid; 25-bias supply (lens Moving apparatus); 26-oscillator (vibrating device).

Fig. 1 is the oblique view that the major part summary of embodiment device constitutes; Fig. 2 is the block scheme of the control loop part among the same embodiment; Fig. 3 is the pie graph of dumb bid.

Among Fig. 1,1 is rotating disk, and it is installed on the turning axle of themotor 3 on thechassis 2 that is fixed on optic pick-up.Small-sized compact substance dish (CD) is installed on the above-mentioned rotatingdisk 1, gives as security into installing and fixing with the square from it side of securing member not shown in the figures, drives its rotation by above-mentionedmotor 3.

Yet in the position, side of the rotatingdisk 1 on above-mentionedchassis 2,optical head 4 moves and is arranged on freely on the CD radial direction that is contained on the above-mentioned rotating disk 1.That is, thisoptical head 4 is moved to be held in and makes its body 4a be parallel to 2guide poles 5,6 thatchassis 2 is provided with, and the tooth bar 7 that is arranged on the sidepiece of body 4a along thisguide pole 5,6 is meshed withpinion wheel 8, and the rotation formation straight line by thispinion wheel 8 moves.And thispinion wheel 8 is installed on and carries out positive and reverse return commentaries on classics driving on the turning axle that is fixed on the control motor 9 on the above-mentionedchassis 2.

Yetoptical head 4 is that main body constitutes with lasing fluorescence body, photosensitive device, object lens, beam splitter etc., above-mentioned lasing fluorescence body, by the card of irradiation CD after the laser pack of 11 pairs of luminous outputs of object lens, the reflected light by above-mentionedobject lens 11 these cards is received by light activated element and so constitutes.And beam splitter separate to penetrate laser and its reflected light and has the function that prevents this mutual interference.

Yetobject lens 11 should penetrate the laser pack on the card of CD by adjusting to focus on to make, and are provided with and it is moved freely along this optical axis direction.In addition,object lens 11, along with the spiral helicine track record that should be able to correctly follow the tracks of on the card that will be formed on this CD from the ejaculation laser of thisoptical head 4 that moves of the rotation of CD andoptical head 4, and theseobject lens 11 move and are arranged on freely that (moving direction of optic pick-up 4) constitutes tracking Control on the direction of reporting to the leadship after accomplishing a task with track record.

Particularly,object lens 11 are installed in the upper end of tubular lens mount 12.Thislens mount 12 is fixed in the other end of 4 parallelcylindrical springs 13 on the sidewall 4b that the one end is fixed in body 4a, like this, thislens mount 12 move respectively be supported in freely this optical axis direction (vector directions X) and with the direction (vector Y direction) of its quadrature on.

Again, on the Z direction sidepiece oflens mount 12, thepermanent magnet 14 of コ word shape is installed with downwards with its peristome.And body 4a goes up with the limit portion around a utmost point that constitutes above-mentionedpermanent magnet 14 focusingcoil 15 is set, and slotting leading in the central space portion ofpermanent magnet 14 is provided withtracking coil 16.

Move up and downlens mount 12 by the energising (magnitude of current) of controlling this focusingcoil 15, thereby moveobject lens 11, to the card formation focusing of CD along optical axis direction.And the energising (magnitude of current) bycontrol tracking coil 16 makes lens mount about 12 (on the Y direction) move the horizontal level displacement that makesobject lens 11, thereby forms the tracking Control for track record.

And, though herepermanent magnet 14 is located on thelens mount 12, showed and to be located at structure on the body 4a corresponding to the focusingcoil 15 ofpermanent magnet 14 andtracking coil 16, but also focusingcoil 15 andtracking coil 16 can be located at the side oflens mount 12,permanent magnet 14 be located at the side of body 4a.

So, in the optical disk reproducing apparatus that has theoptical head 14 that constitutes as mentioned above basically, at this embodiment is under the situation of feature, as shown in Figure 3, thedumb bid 22 that the removing portion material of felt etc. is affixed on this card substitutes common CD and packs on the above-mentionedrotating disk 1, should be with the surface of this dumb bid by mechanicalremoval object lens 11, Here it is adds to the control loop part ofoptical head 4 with function shown in Figure 2.

That is,object lens 11 are driven by 31 energisings of focusing coil driver along the moving up and down focusingcoil 15 of this optical axis direction, this focusingcoil driver 31 collectiong focusing servosignals and moving.Andobject lens 11 are driven by 32 energisings of tracking coil driver along thetracking coil 16 that the CD radial direction moves, and thistracking coil driver 32 is accepted tracking servo signal and is moved.Control loop part with theoptical head 4 that constitutes as feature among this embodiment, it has: for above-mentioned eachdriver 31,32, when pack into rotatingdisk 1 and when satisfying the compulsory exercise condition ofdumb bid 22 as mentioned above, by change focus servo signal and with the device (bias supply 25) that applies predetermined direct current biasing signal as lens Moving apparatus, and by change tracking servo signal with the device (oscillator 26) of the AC signal that applies 1-5Hz as vibrating device.

By the way, the above-mentioned direct current biasing signal that is applied bybias supply 25 is that a kind oflens 11 that should make when surpassing common focusing actuating range produce the signal that a certain amount of rising displacement thereby 31 pairs of focusingcoils 15 of driver pass to a certain amount of electric current along described optical axis direction.By applying the position of thecleaning member 21 that such direct current biasing signal moves to objectlens 11 to be contacted with gently on the card that is attached todumb bid 22.

Be that a kind oflens 11 that should make vibrate in tracking Control direction (with the direction of light shaft positive cross) thereby 32 pairs oftracking coils 16 of driver pass to the used signal of a certain amount of electric current periodically along card by the AC signal ofoscillator 26 added 1-5Hz again.

If focusingcoil 15 and trackingcoil 16 energisings are controlled with above-mentioned direct current biasing signal and AC signal, then be installed on theobject lens 11 of the front end that moves the lens mount of supporting freely 12 by 4 parallelcylindrical springs 13, so that it constitutes side-to-side vibrations at the state that moves on the position contacting gently with thecleaning member 22 of thedumb bid 22 that is loaded on rotatingdisk 1, by the surface of thiscleaning member 21 cleaning object lens.

And, by above-mentioned action, condition as the object lens cleanup action, for example confirm respectively: load ontodumb bid 22, stop rotating disk 1(dumb bid) rotation, add to the cleaning instruction of cleaning status switch operation etc. etc., in adorning the common user mode of CD, consider owing to misoperation not allowobject lens 11 contact the card of CD.

Say again, be set on the write area of interior all sides of card of CD, because writing down the specific address information (TOC of this recorded information; Catalogue listing), so be common CD ordumb bid 22 by for example the time whether detecting the dish of adorning in the TOC decidable rotatingdisk 1 in the initial stage action of the regeneration of dish.Therefore judge it is the situation ofdumb bid 22, rotatingdisk 1 is stopped the rotation, can start above-mentioned cleanup action by judging whether to add by the cleaning signal that instruction manipulation produced.

When carrying out this cleanup action, there is no need to make actions such as signal regeneration loop.And in this case much less, there is no need to makeoptical head 4 to move, would rather wish that along the radial direction of CDoptical head 4 is fixed inobject lens 11 and stands facing each other on the assigned position ofcleaning member 22.

And for the control of above-mentioned cleanup action, though available various sensing element and action control element carry out separate type control, with putting speech, available microprocessors is not carried out software control yet.

According to the foregoing description, because the state that makesobject lens 11 contact thecleaning member 21 of the card that is attached atdumb bid 22 gently makesobject lens 11 side-to-side vibrationss, so can clear up the surface ofobject lens 11 effectively with the contact pressure state of regulation.Do not makedumb bid 22 rotation and can the not simple and easy removing of carrying outobject lens 11 because do not exist, so there is not the supporting structure that makes unnecessary load (loading) add toobject lens 11 again.Because so, so have can not produce the support characteristic of elastic supporting member (cylindrical spring) is degenerated, thereby make and focus on and the effect of the unfavorable condition of the control performance damage of tracking etc. because of excessive loading adds toobject lens 11.

Again,, carry out the removing of object lens, so, have advantages such as the member of making is simple as long as existing optical disk reproducing apparatus is done some changes just can realize this device because still utilize the mobile control gear ofobject lens 11.

And, the invention is not restricted to the foregoing description, for example for thecleaning member 21 that is arranged on thedumb bid 22, replace felt promptly to use the flexible paper wood of Japan paper etc. also passable, even the cleaning solution of available alcohol etc. soak and is contained in the cleaning member 21.Again, the structure of optic pick-up also is not limited to the foregoing description, even can be suitable for too in the structure of the removable support lens mount of the laminated spring that makes up on by the mutually orthogonal direction.

And, in the cleaning control loop, be provided with the cleaning time management function of actuation time, when adding to the cleaning instruction, just can carry out the cleaning action of a stipulated time.With putting speech, cleaning can manually not set actuation time yet.And when action cleaning also can make dumb bid slowly rotate with extremely low speed.

Have, cleaning process is stored, the position of thecleaning member 21 ofcontact object lens 11 is different successively along the radial direction of dish, so just can control with the non-staining position ofcleaning member 21 and clean object lens 11.And, on the extra-regional precalculated position that thecleaning member 21 ofdumb bid 22 attaches, the test signal recording areas is set, after the cleaning action is finished, the information of above-mentioned test signal recording areas is regenerated, just can differentiate its optical characteristics.

It is to be noted, can make many variations to embodiment not breaking away from essential scope of the present invention, and the present invention is applicable to the optical disk reproducing apparatus of various forms and can be implemented.

According to optical disk reproducing apparatus of the present invention, cleaning member for dumb bid, object lens are risen to be in contact with it gently, owing to make this object lens side-to-side vibrations with this state, so can be so that move the initial contact pressure that the supporting structure support object lens freely preserves from, come simple and easy, clean the surface of object lens and effects such as this structure has simply, practicality effectively.

Claims (5)

1, a kind ofly optical head (4) is stood facing each other mutually with the CD of being supported rotation by rotating disk (1) and this optical head is moved and the optical disk reproducing apparatus of the recorded information of this CD of optical regeneration along the radial direction of above-mentioned CD, it is characterized in that it has:

The lens cleaning device that makes the dumb bid (22) that on card, is provided with cleaning member (21) be held in rotating disk and drive and make the object lens of above-mentioned optical head to contact above-mentioned cleaning member and clean,

Described lens cleaning device has:

Make described object lens contact the lens Moving apparatus (25) of the cleaning member of described dumb bid with the focus control mechanism of described optical head, with the follower of described optical head, make by described lens Moving apparatus and make the object lens that contact with described cleaning member vibrating device (26) along the tracking direction vibration.

2, optical disk reproducing apparatus according to claim 1 is characterized in that, described lens cleaning device is only just permitted its action when stopping the dumb bid rotation.

3, lens cleaning device according to claim 1 is characterized in that having only the recorded information of the write area of the CD from be contained in rotating disk to confirm just to permit when this CD is dumb bid its action.

4, lens cleaning device as claimed in claim 1 is characterized in that, only just permits its action when receiving the signal that is sent by lens cleaning instruction manipulation.

5, lens cleaning device as claimed in claim 1 is characterized in that, makes object lens move to cleaning member position contacting with dumb bid with the moving range that surmounts described focusing action.

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