CN113325597A - Speckle eliminating mechanism and laser projection device - Google Patents

Abstract

The invention relates to the technical field of display, and provides a spot dissipation mechanism and a laser projection device. According to the spot dissipation mechanism and the laser projection device, the electromagnetic driving piece is adopted to drive the optical piece to vibrate, the vibration of the optical piece is controlled through the change of the magnetic force, the structure of the controller is convenient to simplify and reduce, the occupied space of the controller is favorably reduced, the electromagnetic driving piece and the controller are simple in structure, and the cost can be reduced.

Description

Speckle eliminating mechanism and laser projection device

Technical Field

The invention belongs to the technical field of display, and particularly relates to a spot dissipation mechanism and a laser projection device.

Background

The laser has the characteristics of wide color gamut, high brightness, good monochromaticity (coherence) and good directivity, and the laser projection display using the laser as a light source has the advantages of high brightness, wide color gamut, long service life and the like. Due to the high coherence of the laser, a high contrast and finely sized granular pattern, i.e. laser speckle, can occur in the laser spot. Laser speckle seriously affects the imaging quality of laser projection, causes picture color distortion or deterioration, and is easy to cause eye fatigue.

The existing laser speckle-dissipating mechanism utilizes the vibration of a piezoelectric ceramic piece to drive an optical device to vibrate so as to reduce the coherence of laser and eliminate speckles. The controller for driving the piezoelectric ceramic chip in the laser spot dissipation mechanism is complex, large in size, occupies the space of the whole machine, and is high in cost.

Disclosure of Invention

The invention aims to provide a speckle eliminating mechanism, which comprises but is not limited to solve the technical problems that a controller for driving a piezoelectric ceramic chip in a laser speckle eliminating mechanism in the prior art is complex, large in size, occupies the space of the whole machine and is high in cost.

In order to solve the above technical problem, an embodiment of the present invention provides a speckle dissipation mechanism, including an optical element and a cantilever base that elastically supports the optical element, wherein the cantilever base is provided with a magnetic attraction element, the speckle dissipation mechanism further includes an electromagnetic driving element that cooperates with the magnetic attraction element to drive the optical element to vibrate, and a controller that is used to control the electromagnetic driving element.

Optionally, the electromagnetic driving member is an electromagnetic chuck.

Optionally, the controller controls the voltage input to the electromagnetic chuck to periodically change, so that the magnetic force of the electromagnetic chuck on the magnetic attraction member periodically changes.

Optionally, the cantilever base includes a support base, an elastic arm fixed on the support base, and a support for supporting the optical element, one end of the elastic arm is connected to the support base, the other end of the elastic arm is connected to the support, and the magnetic element is connected to the support.

Optionally, the magnetic attraction piece is connected with one side of the support far away from the support seat.

Optionally, the magnetic attraction piece includes a connecting plate connected to the bracket, a bending plate bent from one end of the connecting plate away from the optical element to one side of the optical element, and a magnetic attraction plate bent from one end of the bending plate away from the elastic arm to one side of the bending plate away from the optical element.

Optionally, the bracket includes a frame for fixing the optical component, a first mounting plate fixed to one side of the frame, and a second mounting plate fixed to the other side of the frame, the first mounting plate is connected to the elastic arm, and the second mounting plate is connected to the magnetic component; the first mounting plate and the second mounting plate are located on two adjacent sides of the frame body.

Optionally, the resilient arm is a leaf spring.

Optionally, at least one of the incident surface and the exit surface of the optical member is an irregularly undulating surface.

Optionally, the irregular undulations have a peak to valley value of 30 μm to 60 μm.

Optionally, the irregular undulations have a dimension along a plane of the optical member of 3 μm to 100 μm.

Optionally, the optical element has a beam spread angle of 1.5 ° to 7.5 °.

Optionally, the optical member has a thickness of 0.5mm to 1.0 mm.

The invention also provides a laser projection device, which comprises a laser source and the spot dissipation mechanism, wherein laser emitted by the laser source is emitted through the optical piece.

According to the spot dissipation mechanism and the laser projection device, the electromagnetic driving piece is adopted to drive the optical piece to vibrate, the vibration of the optical piece is controlled through the change of the magnetic force, the structure of the controller is simplified and reduced, the occupied space of the controller is reduced, the electromagnetic driving piece and the controller are simple in structure, and the cost can be reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic perspective view of a speckle dissipation mechanism provided in an embodiment of the present invention;

FIG. 2 is a front view of a plaque dissipation mechanism provided by an embodiment of the present invention;

fig. 3 is a schematic perspective view of the magnetic member in fig. 1.

Wherein, in the figures, the respective reference numerals:

1-cantilever seat, 2-electromagnetic driving piece, 3-optical piece, 11-supporting seat, 12-elastic arm, 13-support, 131-frame, 132-first mounting plate, 133-second mounting plate, 14-magnetic piece, 141-connecting plate, 142-bending plate, 143-magnetic plate.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 and 2 together, the speckle dispersing mechanism provided by the present invention will now be described. The speckle dissipation mechanism comprises a cantilever seat 1 and anoptical piece 3, wherein the cantilever seat 1 elastically supports theoptical piece 3. The cantilever base 1 is provided with amagnetic attraction piece 14, the speckle eliminating mechanism further comprises an electromagnetic driving piece 2 and a controller (not shown), the electromagnetic driving piece 2 and themagnetic attraction piece 14 are matched to drive theoptical piece 3 to vibrate, and the controller is used for controlling the electromagnetic driving piece 2. Through controller control electromagnetic driving piece 2, when the voltage change of controller input to electromagnetic driving piece 2, the electric current in the electromagnetic driving piece changes thereupon, and the magnetic field intensity that electromagnetic driving piece 2 produced changes thereupon, and electromagnetic driving piece 2 changes thereupon to the magnetic force ofmagnetism piece 14, and the effort (including magnetic force and elasticity etc.) that cantilever seat 1 received constantly changes, leads to the elastic deformation displacement constantly change of cantilever seat 1 for the lastoptical member 3 vibration of cantilever seat 1. When theoptical element 3 vibrates, the optical path is changed by theoptical element 3, and the phase of the continuous laser beam passing through theoptical element 3 is changed, so that the laser speckle phenomenon caused by high coherence of the laser is eliminated. The suspension arm seat 1 is driven by the electromagnetic driving piece 2 to drive theoptical piece 3 to vibrate, and the vibration of theoptical piece 3 is controlled through the change of magnetic force, so that the structure of the controller is simplified and reduced, the control precision of the vibration of theoptical piece 3 is improved, and the occupied space of the controller is reduced; and the electromagnetic driving part 2 and the controller have simple structures, and the cost can be reduced.

In one embodiment, referring to fig. 1 and fig. 2, the electromagnetic driving component 2 is an electromagnetic chuck, and specifically, the electromagnetic chuck includes a magnetic core and a coil, the coil is sleeved on the magnetic core, when a voltage input to the electromagnetic chuck by the controller changes, a current in the coil changes with the voltage, the current in the coil magnetizes the magnetic core, and a change in the current in the coil changes a magnetic field intensity generated by the magnetic core, so that a magnetic force of the magnetic core on themagnetic attraction component 14 changes continuously. The electromagnetic chuck can increase the area of the generated magnetic field, the magnetic core can enhance the magnetic field intensity generated by the coil, and the magnetic force of the electromagnetic chuck on themagnetic suction piece 14 is enhanced. Here, it can be understood that: the electromagnetic chuck enables the controller to form a channel, the current I in the electromagnetic chuck is equal to U/R, and the power W for the electromagnetic chuck to drive theoptical element 3 to vibrate is equal to U × I (where U denotes the voltage input by the controller to the coil, R denotes the resistance of the coil, and the coil resistance R is usually small); for the piezoelectric ceramics, the similarity to capacitance (resistance is extremely large) is equivalent to the circuit breaking of the controller; in order to generate the same vibration effect for theoptical element 3, when the same output power is generated by the electromagnetic chuck and the piezoelectric ceramic, respectively, the voltage applied to the piezoelectric ceramic is much larger than the voltage applied to the coil. The power supply arranged in the laser projection device has relatively low voltage, cannot meet the input voltage requirement of piezoelectric ceramics, but can meet the input voltage requirement of the electromagnetic chuck. Therefore, the voltage of each electronic element in the internal circuit of the controller in the embodiment of the invention is lower, which is beneficial to reducing the size of each electronic element; meanwhile, an electronic element for boosting the input voltage of the controller power supply is not needed, and the controller of the electromagnetic chuck is facilitated to be simplified and reduced. Of course, in other embodiments, electromagnets or the like of other configurations may be employed.

Alternatively, the magneticallyattractive element 14 may be a magnet; alternatively, themagnetic element 14 is a non-magnetic element that can be attracted by a magnet, such as an alloy of iron, cobalt, nickel, etc. When the electromagnetic chuck generates a magnetic field, the electromagnetic chuck can generate a magnetic force on themagnetic attraction piece 14, and when the magnetic force changes, the elastic deformation position of the cantilever base 1 changes, resulting in the change of the position of theoptical piece 3.

In one embodiment, the controller controls the voltage inputted to the electromagnetic chuck to periodically change, so that the magnetic force of the electromagnetic chuck on themagnetic attraction member 14 periodically changes. Therefore, when the voltage input by the electromagnetic chuck changes periodically, the current and the magnetic field of the electromagnetic chuck can generate the same change period, and the magnetic force and the elastic force drive theoptical element 3 to vibrate periodically. Specifically, the controller may input an alternating current to the electromagnetic chuck, such as a sinusoidal alternating current, a sawtooth wave alternating current, a rectangular wave alternating current, and the like.

Optionally, the controller may include a voltage control unit for adjusting the voltage of the electromagnetic chuck and a frequency conversion unit for adjusting the frequency of the voltage variation, so that the magnetic field strength of the electromagnetic chuck can be adjusted, and the frequency of the magnetic field variation of the electromagnetic chuck can be adjusted, thereby adjusting the amplitude and frequency of themagnetic attraction member 14.

In one embodiment, referring to fig. 1 and 2, the cantilever base 1 includes a supportingbase 11, anelastic arm 12 and abracket 13, the supportingbase 11 is used for being fixed to an external fixing position, theelastic arm 12 is fixed to the supportingbase 11, one end of theelastic arm 12 is connected to the supportingbase 11, the other end of theelastic arm 12 is connected to thebracket 13, and themagnetic member 14 is connected to thebracket 13. Thesupport seat 11 and thebracket 13 are connected through theelastic arm 12, so that the vibration of thebracket 13 is facilitated; thesupport 11 prevents thesupport 13 from being affected by vibrations in the outer fixing position.

Optionally, the supportingseat 11 is a rigid member, which can ensure the stability of the fixing position of theelastic arm 12, reduce the change of the position of theelastic arm 12 along the length direction, and reduce the vibration amplitude of theoptical element 3 along the length direction of theelastic arm 12; meanwhile, the position change of the supportingseat 11 along the light propagation direction can be reduced, and theelastic arm 12 is prevented from swinging back and forth. Alternatively, thesupport 11 and theelastic arm 12 are made of different materials, so as to attenuate resonance and avoid the influence of vibration of thebracket 13 and theoptical element 3 on the external fixing position.

Alternatively, referring to fig. 1 and 2, the supportingseat 11 is a rod, and theelastic arm 12 is disposed perpendicular to the length direction of the supportingseat 11, so as to reduce the swing amplitude of the supportingseat 11 when theelastic arm 12 vibrates.

In one embodiment, referring to fig. 1 to 3, themagnetic element 14 is connected to a side of thebracket 13 away from the supportingbase 11. Thepiece 14 is inhaled to magnetism is located the one side that supportseat 11 was kept away from to support 13, can make like this that thepiece 14 is inhaled to magnetism andelastic arm 12 and be "L" type structure, can form laborsaving lever structure, reduces the power of sucking disc and controller, helps reducing the volume of electromagnetic drive piece 2 volume and controller, improves the sensitivity of vibration.

Optionally, referring to fig. 1 to 3, themagnetic element 14 includes a connectingplate 141, abending plate 142 and amagnetic plate 143, wherein one end of the connectingplate 141 is connected to thebracket 13, the bendingplate 142 is bent from the other end of the connectingplate 141 away from theoptical element 3 to one side of theoptical element 3, and themagnetic plate 143 is bent from one end of thebending plate 142 away from theelastic arm 12 to one side away from theoptical element 3. On one hand, themagnetic attraction plate 143 can keep a certain distance from theoptical element 3, so that labor is saved when theoptical element 3 is driven to vibrate, the power of the electromagnetic driving element 2 is reduced, and the sensitivity of the electromagnetic driving element 2 is improved; on the other hand, the rigidity between themagnetic attraction piece 14 and thebracket 13 can be maintained, so that the vibration amplitude and the frequency of theoptical piece 3 can be adjusted conveniently.

Referring to fig. 1 and fig. 2, optionally, themagnetic attraction plate 143 is disposed opposite to the electromagnetic driving element 2, and themagnetic attraction plate 143 is opposite to the electromagnetic chuck, so that the acting force of the electromagnetic driving element 2 on themagnetic attraction element 14 is perpendicular to theelastic arm 12, and theelastic arm 12, thebracket 13, and themagnetic attraction element 14 can vibrate in the same plane.

Alternatively, referring to fig. 1 and fig. 2, the electromagnetic driving element 2 is mounted on a side of thebracket 13 away from theelastic arm 12, that is: themagnetic attraction 14 is located between theresilient arm 12 and the electromagnetic drive element 2. Therefore, the space on the lower side of thebracket 13 can be fully utilized to install the electromagnetic driving part 2, so that the spot dissipation mechanism is more compact in structure and smaller in size.

Optionally, referring to fig. 1 and fig. 2, a gap between themagnetic attraction plate 143 and the electromagnetic driving element 2 is smaller than a distance between an end of thebracket 13 away from theelastic arm 12 and a mounting surface where an end of the electromagnetic driving element 2 away from theelastic arm 12 is located, when theoptical element 3 swings downward, theelastic arm 12 deforms into an arc shape with an upward-bent middle portion, so as to prevent theoptical element 3 from moving downward; after theoptical element 3 continues to move downward until themagnetic attraction plate 143 contacts the electromagnetic driving element 2, the electromagnetic driving element 2 blocks themagnetic attraction element 14, so that theoptical element 3 stops moving downward, and the portion of theelastic arm 12 adjacent to thebracket 13 bends downward. Therefore, the phenomenon that theoptical part 3 is damaged or theelastic arm 12 deforms due to the fact that thebracket 13 vibrates and collides with the mounting surface in the transportation process of the spot dissipation mechanism can be avoided.

In one embodiment, referring to fig. 1 and fig. 2, thebracket 13 includes aframe 131, afirst mounting plate 132 and asecond mounting plate 133, theoptical component 3 is fixed in theframe 131, the first mountingplate 132 is fixed on the top of theframe 131, thesecond mounting plate 133 is fixed on the side of theframe 131, the first mountingplate 132 is connected to theelastic arm 12, and thesecond mounting plate 133 is connected to themagnetic component 14; the first mountingplate 132 and thesecond mounting plate 133 are located on adjacent sides of theframe 131. Adoptframework 131 to fixoptical element 3, can play better guard action tooptical element 3's edge foroptical element 3 is balanced at the edge atress of vibration in-process, can preventoptical element 3 edge damage of colliding with simultaneously. Thefirst mounting plate 132 and thesecond mounting plate 133 can be used to protect the upper side and the left and right sides of theoptical member 3 in cooperation with theelastic arm 12, themagnetic attraction member 14, and thesupport base 11. And then theoptical element 3 can be surrounded by four sides by matching with the electromagnetic driving element 2, thereby playing a double protection role.

Alternatively, referring to fig. 1 and fig. 2, the first mountingplate 132, thesecond mounting plate 133 and theframe 131 are integrally formed, so that the structural strength of thebracket 13 can be ensured, and theoptical element 3 and thebracket 13 can be kept stable.

When the electromagnetic driving element 2 drives theoptical element 3 to vibrate, theelastic arm 12 and themagnetic attraction element 14 connected to thebracket 13 exert acting forces on theoptical element 3, and the two acting forces and theoptical element 3 are located in the same plane, so that theoptical element 3 is constrained in the same plane in the vibration process, and theoptical element 3 is prevented from being twisted in the light incidence or emission direction in the vibration process of theoptical element 3. The electromagnetic driving part 2 is completely separated from theoptical part 3, themagnetic attraction part 14 is rigidly connected with theoptical part 3, the electromagnetic driving part 2 can better control the vibration amplitude and frequency of theoptical part 3 to the acting force of theoptical part 3, and the interference generated by the vibration of theelastic arm 12, theoptical part 3 and the like when theelastic arm 12 vibrates at high frequency is avoided.

In one embodiment, referring to fig. 1 and 2, theelastic arm 12 is a leaf spring. The leaf spring has good elasticity, and is not easy to swing towards the front and back directions of theoptical piece 3, so that theoptical piece 3 can vibrate in a vertical plane. Optionally, the leaf spring is made of silicon steel 60Si2Mn (silicon manganese spring steel), and the material can ensure the elasticity of theelastic arm 12 on one hand, and on the other hand, the fatigue resistance is good, so that the leaf spring can be prevented from being broken under high-frequency vibration and has a long service life.

Optionally, referring to fig. 1, the supportingseat 11 is in an inverted "T" shape, the lower end of the supportingseat 11 is connected to the external fixing position, the supportingseat 11 is fixed to the external fixing position, and the top end of the supportingseat 11 is connected to theelastic arm 12. Therefore, the contact area between the supportingseat 11 and the external installation position can be increased, the stability of the supportingseat 11 is kept, the vibration of the supportingseat 11 when theelastic arm 12 vibrates is reduced, and theoptical element 3 is prevented from being inclined to cause light ray shake.

Alternatively, theelastic arm 12 includes a vibration plate, a first fixing plate and a second fixing plate; the first fixing plate is positioned at one end where the vibrating plate is connected with the supportingseat 11, the first fixing plate is formed by bending one end where the vibrating plate is connected with the supportingseat 11 to the other end of the supportingseat 11, the first fixing plate is fixed with the side face of the supportingseat 11, and the position, adjacent to the first fixing plate, of the vibrating plate is fixedly connected with the top of the supportingseat 11; the second fixing plate is located at one end where the vibrating plate is fixed to thebracket 13, the second fixing plate is formed by bending one side of the vibrating plate toward thebracket 13, and the first mountingplate 132 of thebracket 13 is connected to one side of the second fixing plate close to the vibrating plate. Therefore, on one hand, the fixing structure of theelastic arm 12 and thebracket 13 can be kept stable, and theelastic arm 12 and the supportingseat 11 or theframe body 131 and theelastic arm 12 are prevented from loosening in the vibration process of theoptical element 3; on the other hand, the incident surface and the exit surface of theoptical element 3 can be positioned in the width area corresponding to thesupport seat 11 and theelastic arm 12, so that the occupied width of the speckle dispersing mechanism is reduced, and the incident surface and the exit surface of theoptical element 3 are protected.

Optionally, theframe 131 is made of a non-magnetic material, such as a material that cannot be attracted by a magnet, such as a hard silica gel, a plastic, aluminum, an aluminum alloy, etc., so as to prevent the magnetism of themagnetic attraction plate 143 from being transmitted to thebracket 13 or theelastic arm 12, and prevent thebracket 13 or theelastic arm 12 from generating magnetism and generating an interaction with other components or external objects, which may interfere with the movement of theoptical element 3.

In one embodiment, theoptical member 3 has an entrance face and an exit face, at least one of which of the entrance face and the exit face of theoptical member 3 is an irregularly undulating surface, namely: theoptical member 3 is a diffusion sheet, and at least one of the incident surface and the exit surface has a structure similar to a ground glass surface and has a certain roughness. Therefore, the light can penetrate through, and random phase change of the light can be caused when the light penetrates through. The irregular fluctuation of the surface of theoptical element 3 can cause the phase of the light beam passing through theoptical element 3 to be changed randomly, so as to achieve the purpose of eliminating the laser speckle. Optionally, the thickness of theoptical element 3 is greater than four times of the peak-to-valley value of the irregular fluctuation on theoptical element 3, and the thickness of theoptical element 3 is not more than forty times of the peak-to-valley value of the irregular fluctuation on theoptical element 3, so that the processing of the surface of theoptical element 3 can be facilitated on the one hand, and on the other hand, the structural strength of theoptical element 3 can be guaranteed, and theoptical element 3 is prevented from being damaged. Optionally, the ratio of the thickness of theoptical member 3 to the thickness of the irregularly undulating peaks and valleys is 10, 15, 20, 25, 30, 35, or the like. Wherein the peak-to-valley value represents the size of the irregular undulations along the normal to theoptic 3.

Optionally, the peak-to-valley value of the irregular fluctuation is 30 μm to 60 μm, so that on one hand, the phase of light can be better changed in the range, a better speckle suppression effect is obtained, and a light emitting effect is ensured, and on the other hand, the influence of the irregular fluctuation on the intensity of theoptical element 3 can be avoided. Alternatively, the peak-to-valley value of the irregular undulations is 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, or the like.

Optionally, the size of the irregular undulations along the plane of theoptical member 3 is 3 μm to 100 μm, and the size of the irregular undulations along the plane of theoptical member 3 is the length and width of the irregular undulations. Therefore, speckle suppression effects at all positions of theoptical element 3 are uniform, and the light emitting effect of theoptical element 3 is prevented from being influenced. Alternatively, the size of the irregular undulations is 10 μm, 30 μm, 50 μm, 70 μm, 90 μm, or the like.

Optionally, theoptical element 3 has a beam spread angle of 1.5 ° to 7.5 °, i.e.: the incident beam vertical to theoptical element 3 passes through the irregular fluctuation on theoptical element 3, and the angle of the emergent beam expanding outwards from the incident beam direction is 1.5-7.5 degrees. The small irregularities cause a large beam spread angle and thus a large beam divergence, and therefore the irregularities are inversely related to and have a correspondence with the beam spread angle of the diffusion sheet. Namely: the beam spread angle is determined by the size of the irregular undulations in the longitudinal and transverse directions on theoptical member 3, and the beam spread angle can be optimized by controlling the size of the irregular undulations, so that the beam spread angle meets the requirements. Therefore, on one hand, the speckle suppression effect can be prevented from being influenced by the undersize angle of the beam spread angle, and on the other hand, the light emitting effect can be prevented from being influenced by the light energy loss caused by the overlarge angle of the beam spread angle. Optionally, the beam spread angle of the irregularity determining optical member is 3 °, 4.5 °, 6 °, 6.5 °, 7 °, or the like.

Optionally, the thickness of theoptical element 3 is 0.5mm to 1.0mm, so that on one hand, the strength of theoptical element 3 can be guaranteed, and the processing of the surface of theoptical element 3 is facilitated, and on the other hand, theoptical element 3 can be made lighter in weight, and the vibration of theoptical element 3 can be controlled conveniently. Optionally, theoptical piece 3 has a thickness of 0.5mm, 0.7mm, 0.8mm, 1mm, or the like.

Optionally, one of the incident surface and the exit surface of theoptical element 3 is irregular, and the other surface is a plane, so that on one hand, the effect of eliminating speckles can be achieved, and on the other hand, the weakened intensity of light passing through theoptical element 3 can be reduced, and the exit intensity of the light can be improved.

The embodiment of the invention also provides a laser projection device which comprises a laser source and the spot dissipation mechanism, wherein laser emitted by the laser source is emitted out through theoptical piece 3. When the cantilever base 1 vibrates elastically, theoptical element 3 can be driven to vibrate along with the cantilever base, at the moment, theoptical element 3 enables the light path to change, the phase of continuous laser beams penetrating through theoptical element 3 can generate random irregular change, and the laser speckle phenomenon caused by high coherence of the laser is eliminated. Adopt electromagnetic drive piece 2 to order about cantilever seat 1 and drive the vibration ofoptical part 3, realize the control tooptical part 3 vibration frequency through the change of magnetic field intensity and frequency, be favorable to improving the control accuracy ofoptical part 3 vibration, and electromagnetic drive piece 2 and controller simple structure are favorable to reducing controller occupation space, can reduce cost.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (13)

1. The spot dissipation mechanism comprises an optical piece and a cantilever seat for elastically supporting the optical piece, and is characterized in that: the spot dissipation mechanism further comprises an electromagnetic driving part and a controller, wherein the electromagnetic driving part is matched with the magnetic attraction part to drive the optical part to vibrate, and the controller is used for controlling the electromagnetic driving part.

2. The plaque dissipating mechanism of claim 1 wherein: the electromagnetic driving part is an electromagnetic chuck.

3. The plaque dissipating mechanism of claim 2 wherein: the controller controls the voltage input to the electromagnetic chuck to periodically change, so that the magnetic force of the magnetic suction piece is periodically changed by the electromagnetic chuck.

4. The plaque dissipating mechanism of claim 1 wherein: the cantilever base comprises a supporting base, an elastic arm fixed on the supporting base and a support supporting the optical piece, one end of the elastic arm is connected with the supporting base, the other end of the elastic arm is connected with the support, and the magnetic piece is connected with the support.

5. The plaque dissipating mechanism of claim 4 wherein: the magnetic attraction piece is connected with one side of the support far away from the supporting seat.

6. The plaque dissipating mechanism of claim 5 wherein: the magnetic attraction piece comprises a connecting plate connected with the support, a bending plate and a magnetic attraction plate, wherein the bending plate is bent from one end, far away from the optical piece, of the connecting plate to one side of the optical piece, and the magnetic attraction plate is formed by bending one end, far away from the elastic arm, of the bending plate to one side, far away from the optical piece.

7. The plaque dissipating mechanism of claim 4 wherein: the bracket comprises a frame body for fixing the optical part, a first mounting plate fixed on one side of the frame body and a second mounting plate fixed on the other side of the frame body, wherein the first mounting plate is connected with the elastic arm, and the second mounting plate is connected with the magnetic part; the first mounting plate and the second mounting plate are located on two adjacent sides of the frame body.

8. The plaque dissipating mechanism of claim 4 wherein: the elastic arm is a leaf spring.

9. The plaque dissipating mechanism of any of claims 1 to 8, wherein: at least one of the incident surface and the emergent surface of the optical element is an irregularly fluctuated surface.

10. The plaque dissipating mechanism of claim 9 wherein: the peak-to-valley value of the irregular fluctuation is 30-60 mu m.

11. The plaque dissipating mechanism of claim 9 wherein: the size of the irregular fluctuation along the plane of the optical piece is 3-100 mu m.

12. The plaque dissipating mechanism of claim 9 wherein: the light beam diffusion angle of the optical piece is 1.5-7.5 degrees.

13. Laser projection apparatus, including laser source, its characterized in that: the speckle dissipating mechanism of any of claims 1-12, further comprising a laser light source emitting laser light through the optical member.

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