CN213634086U

CN213634086U - Laser projection lens and laser projection equipment

Info

Publication number: CN213634086U
Application number: CN202023028162.6U
Authority: CN
Inventors: 逄相来
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-07-06
Anticipated expiration: 2030-12-15

Abstract

The application discloses laser projection camera lens and laser projection equipment belongs to laser projection technical field. This laser projection lens includes: lens mount, lens group, metal side cap and radiator unit. The lens group is positioned on the lens base and comprises a reflector. The metal side cover is connected with the lens base and is positioned on one side of the lens group close to the reflector. The heat dissipation assembly is connected with one side of the metal side cover, which is far away from the reflector. Because the rigidity of this metal side cap is stronger, consequently this metal side cap is difficult for the deformation for this metal side cap is after assembling on the lens mount, and this lens mount is difficult for taking place the deformation, has reduced the probability that the speculum that sets up in this lens mount takes place to remove, makes the speculum to the influence degree of light propagation path less, has improved this laser projection lens's power of resolving a picture.

Description

Laser projection lens and laser projection equipment

Technical Field

The application relates to the technical field of laser projection, in particular to a laser projection lens and laser projection equipment.

Background

The laser projection system comprises a projection screen and a laser projection device, wherein the laser projection device can project pictures on the projection screen to realize the functions of video playing and the like.

Currently, the laser projection apparatus generally includes: laser projection lens, optical engine, etc. The laser projection lens may generally include: lens mount, lens group and subassembly such as plastics side cap. For example, referring to fig. 1 and 2, fig. 1 is an exploded view of a laser projection lens provided in the related art, and fig. 2 is an exploded view of another laser projection lens provided in the related art. The laser projection lens 00 includes: lens mount 01, lens group 02 and plastic side cover 03. The lens group 02 is disposed on the lens mount 01, and the lens group 02 has a reflecting mirror 021. The plastic side cover 03 is connected to the lens mount 01 and is located on the side close to the mirror 021 in the lens group 02. This laser projection lens 00 plays decisive role as the imaging element to the display effect of picture. In order to ensure the definition of the image projected by the laser projection apparatus, it is necessary to ensure that the resolving power of the laser projection lens 00 is high. The factors affecting the resolution of the laser projection lens 00 include: the resolution of the mirror 021 in the laser projection lens 00, the stability of each component in the laser projection lens 00 in the using process, and the like.

However, since the plastic side cover 03 has low manufacturing accuracy and the plastic side cover 03 has low rigidity, the plastic side cover 03 is easily deformed. After the deformed plastic side cover 03 is fastened and connected with the lens mount 01, a certain acting force is generated between the plastic side cover 03 and the lens mount 01, the lens mount 01 is deformed to a certain degree, so that the position of a reflecting mirror 021 on the lens mount 01 is changed, and the reflecting mirror 021 after the position is changed can cause the change of a light propagation path to influence the resolving power of the laser projection lens. Moreover, the plastic side cover 03 has poor heat conductivity, and when the laser projection device works, the heat generated by the laser projection device can cause the working temperature of the laser projection lens 00 to be higher, which causes the phenomenon that the plastic side cover 03, the lens mount 01, the reflecting mirror 021 and other parts expand due to heating. Parts such as this plastics side cap 03, lens mount 01 and speculum 021 all have deformation of different degree, so, not only can aggravate the degree that the position of speculum 021 on the lens mount 01 changes, the speculum 021 that takes place deformation also can further influence the propagation path of light, further influence laser projection lens 00's resolving power, lead to the picture definition that laser projection lens 00 throws to be lower.

SUMMERY OF THE UTILITY MODEL

The application provides a laser projection lens and laser projection equipment, can solve the lower problem of the picture definition that laser projection lens throws out among the prior art. The technical scheme is as follows:

the application provides a laser projection lens, includes:

in one aspect, a laser projection lens is provided, which includes:

a lens mount;

a lens group on the lens mount, the lens group comprising: a mirror;

the metal side cover is connected with the lens mount and is positioned on one side of the lens group close to the reflector;

and the heat dissipation assembly is connected with one side of the metal side cover, which is far away from the reflector.

In another aspect, there is provided a laser projection apparatus including: the laser projection lens is provided.

The beneficial effect that technical scheme that this application provided brought is:

the laser projection lens comprises a lens base, a lens group, a metal side cover and a heat dissipation assembly, wherein the lens group comprises a reflector. Because the rigidity of this metal side cap is stronger, consequently this metal side cap is difficult for the deformation for this metal side cap is after assembling on the lens mount, and this lens mount is difficult for taking place the deformation, has reduced the probability that the speculum that sets up in this lens mount takes place to remove, makes the speculum to the influence degree of light propagation path less, has improved this laser projection lens's power of resolving a picture. And the radiating effect of this metal side cap is better, this laser projection camera lens has still set up radiator unit, under this condition, when the laser projection equipment during operation at this laser projection camera lens place, help the heat dissipation of laser projection camera lens through this metal side cap and radiator unit, the operating temperature of this radiator lens has been reduced, the degree that takes place to deform after making the speculum of lens mount and lens group thermal expansion is less, and the coefficient of expansion of metal side cap is lower, the phenomenon of thermal expansion is difficult to appear, the influence degree of speculum to light propagation path has further been reduced, thereby further improved this laser projection camera lens's image resolving power, make the picture definition that this laser projection camera lens throws out higher, guarantee that this laser projection equipment's imaging effect is better.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is an exploded view of a laser projection lens provided in the related art;

fig. 2 is an exploded view of another laser projection lens provided in the related art;

fig. 3 is an exploded view of a laser projection lens according to an embodiment of the present disclosure;

fig. 4 is an exploded view of another laser projection lens provided in the embodiments of the present application;

fig. 5 is an exploded view of another laser projection lens provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of another laser projection lens provided in an embodiment of the present application;

FIG. 7 is an exploded view of the laser projection lens shown in FIG. 6;

FIG. 8 is a partial schematic structural view of the connecting member shown in FIG. 4 after connecting the lens holder and the metal side cover;

fig. 9 is a schematic structural diagram of a laser projection system according to an embodiment of the present application.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 3, fig. 3 is an exploded view of a laser projection lens according to an embodiment of the present disclosure. The laser projection lens 000 may include:

lens mount 100, lens group 200, metal side cover 300 and heat sink assembly 400.

The lens set 200 is disposed on the lens holder 100, and the lens set 200 includes a reflector 201. In an embodiment of the present application, the lens set 200 may further include: the lens comprises a plurality of convex lenses and a plurality of concave lenses, and the convex lenses and the concave lenses can be arranged in various combinations. The plurality of convex lenses and the plurality of concave lenses may project the illumination light beam reflected by the optical engine into an image.

The metal side cover 300 is connected to the lens holder 100, and the metal side cover 300 is located on a side of the lens assembly 200 close to the reflector 201.

The heat sink assembly 400 is connected to a side of the metal side cover 300 away from the reflector 201.

In the embodiment of the present application, since the rigidity of the metal side cover 300 is stronger than that of the plastic side cover, the metal side cover 300 is less prone to deform compared to the plastic side cover, so that after the metal side cover 300 is assembled on the lens mount 100, the lens mount 100 is less prone to deform, the probability of movement of the mirror 201 disposed in the lens mount 100 is reduced, the influence degree of the mirror 021 on the light propagation path is smaller, and the resolving power of the laser projection lens 000 is improved. In addition, the heat dissipation effect of the metal side cover 300 is better than that of the plastic side cover, and the laser projection lens 000 is further provided with a heat dissipation assembly 400. In this case, when the laser projection apparatus where the laser projection lens 000 is located works, the metal side cover 300 and the heat dissipation assembly 400 help to dissipate heat of the laser projection lens 000, and reduce the working temperature of the heat dissipation lens 000, so that the degree of deformation of the lens mount 100 and the reflector 201 in the lens group 200 after being heated and expanded is small, and the expansion coefficient of the metal side cover 300 is low, so that the phenomenon of thermal expansion is not easy to occur. The influence of the reflecting mirror 201 on the light propagation path is further reduced, and the resolution of the laser projection lens 000 is further improved.

To sum up, the present application provides a laser projection lens, which includes: lens mount, lens group, metal side cap and radiator unit. Because the rigidity of this metal side cap is stronger, consequently this metal side cap is difficult for the deformation for this metal side cap is after assembling on the lens mount, and this lens mount is difficult for taking place the deformation, has reduced the probability that the speculum that sets up in this lens mount takes place to remove, makes the speculum to the influence degree of light propagation path less, has improved this laser projection lens's power of resolving a picture. And the radiating effect of this metal side cap is better, this laser projection camera lens has still set up radiator unit, under this condition, when the laser projection equipment during operation at this laser projection camera lens place, help the heat dissipation of laser projection camera lens through this metal side cap and radiator unit, the operating temperature of this radiator lens has been reduced, the degree that takes place to deform after making the speculum of lens mount and lens group thermal expansion is less, and the coefficient of expansion of metal side cap is lower, the phenomenon of thermal expansion is difficult to appear, the influence degree of speculum to light propagation path has further been reduced, thereby further improved this laser projection camera lens's image resolving power, make the picture definition that this laser projection camera lens throws out higher, guarantee that this laser projection equipment's imaging effect is better.

In the embodiment of the present application, there are various realizable manners of the structure of the heat dissipation assembly 400 in the laser projection lens 000, and the embodiment of the present application is schematically illustrated by taking the following two realizable manners as examples:

in a first implementation manner, please refer to fig. 4, where fig. 4 is an exploded view of another laser projection lens provided in an embodiment of the present application. The heat sink assembly 400 may include: and a plurality of heat dissipation fins 401 fixedly connected with one side of the metal side cover 300 far away from the reflector 201.

In the embodiment of the present application, the heat dissipation area of the metal side cover 300 can be increased by the plurality of heat dissipation fins 401, the heat dissipation capability of the metal side cover 300 is improved, the working temperature of the laser projection lens 000 is further reduced, and then the degree of deformation after the lens mount 100 in the laser projection lens 000 and the reflector 201 in the lens group 200 are heated and expanded is reduced, so that the image resolving capability of the laser projection lens 000 is ensured to be better.

Alternatively, the plurality of heat dissipation fins 401 may be welded to a side of the metal side cover 300 away from the reflector 201, or the plurality of heat dissipation fins 401 may be integrated with the metal side cover 300, or the plurality of heat dissipation fins 401 may be fixed to a side of the metal side cover 300 by other connection methods, which is not limited in this embodiment of the present invention.

In a second implementation manner, please refer to fig. 5, where fig. 5 is an exploded view of another laser projection lens provided in an embodiment of the present application. The metal side cover 300 has a vent K, and the heat dissipation assembly 400 includes a bracket 402 fixedly connected to the metal side cover 300, and a fan (not shown) movably connected to the bracket 402, wherein an air outlet surface of the fan faces the vent K.

In the embodiment of the present application, when the laser projection apparatus where the laser projection lens 000 is located operates, the fan can blow air to the lens holder 100 of the laser projection lens 000, which is helpful for dissipating heat of the laser projection lens 000, and reduces the operating temperature of the heat dissipation lens 000, and the temperature of each position of the reflector 201 (not shown in fig. 5) on the lens holder 100 can be made to be the same through the blowing of the fan. Further, the degree of deformation of the lens mount 100 and the reflector 201 in the laser projection lens 000 after thermal expansion is reduced, and the laser projection lens 000 is ensured to have good resolving power.

Optionally, there are various ways of fixing the bracket 402 and the metal side cover 300 in the heat dissipation assembly 400, and the following two cases are taken as examples for the present application to schematically illustrate:

in a first case, referring to fig. 5, the heat dissipation assembly 400 further includes a plurality of screws (not shown), the bracket 402 is provided with a plurality of through holes 402a corresponding to the plurality of screws one by one, and a plurality of threaded holes 300a communicating with the plurality of through holes 402a one by one are formed around the metal side cover 300 near the vent K. Each screw of the plurality of screws passes through the corresponding through hole and then is in threaded connection with the corresponding threaded hole, so that the fixed connection between the bracket 402 and the metal side cover 300 is realized. The number and the arrangement positions of the plurality of screws, the plurality of screw holes 402a and the plurality of screw holes 300a may be set according to actual requirements, which is not limited in the embodiment of the present application.

In the second case, the bracket 402 and the metal side cover 300 can be fixedly connected by means of snap-fit connection. For example, a plurality of clamping blocks are arranged on the side of the bracket 402, a plurality of clamping grooves corresponding to the clamping blocks in a one-to-one manner are arranged on the periphery of the metal side cover 300 close to the ventilation opening K, or a plurality of clamping grooves are arranged on the side of the bracket 402, and a plurality of clamping blocks corresponding to the clamping grooves in a one-to-one manner are arranged on the periphery of the metal side cover 300 close to the ventilation opening K. The plurality of clamping blocks are clamped into the corresponding plurality of clamping grooves, so that the bracket 402 and the metal side cover 300 are fixedly connected. The setting positions and the number of the plurality of clamping blocks and the plurality of clamping grooves can be set according to actual requirements, and the embodiment of the application does not limit the setting positions and the number.

It should be noted that the connection manner of the bracket 402 and the metal side cover 300 is not limited to the connection manner in the above two cases, and in other possible implementation manners, the connection manner of the bracket 402 and the metal side cover 300 may be modified according to actual requirements, which is not limited in this embodiment of the application.

In this application, the fan may include a fan body, and a fan rotating shaft connected to the body. The fan shaft can be movably connected to the bracket 402, and the fan can be assembled to the bracket 402.

Optionally, as shown in fig. 5, the heat dissipation assembly 400 may further include: a heat sink 403, and a heat transfer pipe 404 having a first end connected to the heat sink 403. A second end of the heat pipe 404 may be connected to a side of the bracket 402 away from the metal side cover 300. The heat generated by the laser projection apparatus in which the laser projection lens 000 is located during operation can be conducted to the heat sink 403 through the metal side cover 300, the bracket 402 and the heat pipe 404 in sequence to dissipate the heat. Therefore, the working temperature of the laser projection lens 000 can be further reduced by the heat sink 403, and then the degree of deformation of the lens mount 100 of the laser projection lens 000 and the reflector 201 of the lens group 200 after thermal expansion is reduced, so as to ensure that the resolution of the laser projection lens 000 is better.

For example, the heat conducting pipe 404 in the heat dissipation assembly 400 can be a liquid cooling pipe or a metal heat conducting pipe. When the heat conducting pipe 404 is a liquid cooling pipe, the liquid in the liquid cooling pipe can be a heat conducting liquid flowing circularly.

It should be noted that the heat dissipation assemblies shown in the two implementation manners can be combined arbitrarily according to actual requirements. For example, a combined structure of the metal side cover 300 and the heat radiating fins 401 in fig. 4 is provided in the laser projection lens 000 in fig. 5. For another example, the metal side cover 300 having the vent K in fig. 5, the holder 402, the fan, the heat sink 403, and the heat pipe 404 are provided in the laser projection lens 000 in fig. 4.

In the related art, as shown in fig. 1 and 2, the laser projection lens 00 further includes: a plurality of screws 04, a plurality of through holes 05 corresponding to the plurality of screws 04 one to one are arranged on the plastic side cover 03, and a plurality of threaded holes 06 corresponding to the plurality of through holes 05 one to one are arranged on the lens mount 01. Each screw of the plurality of screws passes through the corresponding through hole and then is in threaded connection with the corresponding threaded hole, so that the lens mount 100 and the metal side cover 300 are fixedly connected. The arrangement positions of the plurality of screws 04, the plurality of through holes 05 and the plurality of threaded holes 06 can be set according to actual requirements.

For example, the laser projection lens 00 includes 4 screws 04, the plastic side cover 03 is provided with 4 through holes 05 corresponding to the 4 screws 04 one by one, and the lens holder 01 is provided with 4 threaded holes 06 corresponding to the 4 through holes 05 one by one. As shown in fig. 1, the 4 screws 04 all extend in the same direction. As shown in fig. 2, the 4 screws 04 include: 2 first screws 041 with the same extension direction, and 2 second screws 042 with the same extension direction, wherein the extension direction of the first screws 041 is crossed with the extension direction of the second screws 042.

When each screw 04 of the plurality of screws 04 passes through the corresponding through hole 05 and then is in threaded connection with the corresponding threaded hole 06, the plastic side cover 03 and the lens mount 01 can be locked through the screws 04, and the lens mount 01 and the plastic side cover 03 can be firmly connected. After the plastic side cover 03 and the lens mount 01 are locked by the screw 04, a force applied by the screw 04 to the lens mount 01 may be referred to as a locking force. However, the magnitude of the locking force of the screw 04 cannot be precisely controlled in the process of assembling the screw 04. Therefore, in order to ensure a secure connection between the plastic side cover 03 and the lens holder 01, the locking force of the screw 04 is generally large, resulting in a large force applied to the lens holder 01 by the screw 04. Therefore, the degree of deformation of the lens mount 01 is increased, the displacement degree of the reflecting mirror 021 on the lens mount 01 is further increased, and the resolving power of the laser projection lens 00 is influenced.

In view of this, in the embodiment of the present application, the laser projection lens further includes: the connection member 500, the metal side cover 300 and the lens holder 100 can be connected by the connection member 500. The connecting piece 500 can ensure the stable connection between the metal side cover 300 and the lens mount 100, the acting force on the lens mount 100 is small, and after the metal side cover 300 is connected with the lens mount 100 through the connecting piece 500, the probability of deformation of the lens mount 100 under the action of the connecting piece 500 is small. In the present application, there are various realizations of the structure of the connection member 500, and the embodiments of the present application are schematically illustrated by taking the following two alternative realizations as examples:

in a first alternative implementation manner, please refer to fig. 5, 6, and 7, fig. 6 is a schematic structural diagram of another laser projection lens provided in an embodiment of the present application, and fig. 7 is an exploded view of the laser projection lens shown in fig. 6. The connection 500 in the laser projection lens 000 may include: a first clip 501 on the lens holder 100, and a second clip 502 on the metal side cover 300 for clipping the first clip 501. The first clip 501 is clipped to the second clip 502 to fasten the metal side cover 300 to the lens holder 100. Because in the design process of the laser projection lens 000, the sizes of the first clamping piece 501 and the second clamping piece 502 can be designed, and it is ensured that after the first clamping piece 501 and the second clamping piece 502 are clamped, the acting force applied to the lens mount 100 by the first clamping piece 501 and the second clamping piece 502 is ensured to be smaller on the premise of realizing the fastening connection between the metal side cover 300 and the lens mount 100. Therefore, the probability of deformation of the lens mount 100 under the action of the first clamping piece 501 and the second clamping piece 502 can be effectively reduced, and then the probability of displacement of the reflector 201 on the lens mount 100 is reduced, so that the resolution of the laser projection lens 00 is better.

Alternatively, the number of the first clamping members 501 may be multiple, and the first clamping members 501 are disposed on the side wall of the lens mount 100 close to the metal side cover 300. The number of the second fasteners 502 can be multiple, and the second fasteners 502 are disposed on the side wall of the metal side cover. The number of the first fasteners 501 is equal to that of the second fasteners 502, and the first fasteners and the second fasteners correspond to each other. For example, as shown in fig. 5 and fig. 6, the number of the first fasteners 501 is 4, the 4 first fasteners 501 are respectively disposed on the sidewall of the lens mount 100 close to the metal side cover 300 in a pairwise opposite manner, the number of the second fasteners 502 is 4, the 4 second fasteners 502 are respectively disposed on the sidewall of the metal side cover 300 in a pairwise opposite manner, the 4 first fasteners 501 correspond to the 4 second fasteners 502 one by one, and each first fastener 501 may be fastened with the corresponding second fastener 502.

In this application, the first clamping member 501 may be a clamping block, and the second clamping member 502 may be a clamping groove matched with the clamping block, or the first clamping member 501 may be a clamping groove, and the second clamping member 502 may be a clamping block, which is not limited in this application. Optionally, the first clip 501 is fixedly connected with the lens mount 100 by welding, and the second clip 502 is fixedly connected with the metal side cover 300 by welding, or the first clip 501 and the lens mount 100 are integrated, and the second clip 502 and the metal side cover 300 are integrated, which is not limited in this application.

Optionally, referring to fig. 6, after the first clip 501 is clipped to the second clip 502, a gap b is formed between the first clip 501 and the second clip 502.

In the embodiment of the present application, since the laser projection apparatus generates a certain amount of heat during operation, various components inside the laser projection apparatus may be expanded by heat, for example, the first clamping member 501 and the second clamping member 502 in the laser projection lens 000 may be expanded by heat. Therefore, in the embodiment of the present application, the gap b is provided between the first clamping member 501 and the second clamping member 502, and the phenomenon that the clamping fails due to overlarge interaction force after the first clamping member 501 and the second clamping member 502 are heated and expanded can be avoided through the gap b.

It should be noted that, as the temperature of the laser projection apparatus increases, the expansion amount of the first clip 501 and the second clip 502 expanding when heated increases gradually, so that the gap b between the first clip 501 and the second clip 502 decreases continuously.

The gap b is calculated by the difference between the use temperature of the laser projection equipment and the ambient temperature of the laser projection equipment. After the materials of the first clamping member 501 and the second clamping member 502 are determined, the thermal expansion coefficients of the first clamping member 501 and the second clamping member 502 can be determined according to the materials, the expansion amounts of the first clamping member 501 and the second clamping member 502 after thermal expansion are determined according to the difference between the thermal expansion coefficients and the service temperature of the laser projection device and the ambient temperature of the laser projection device, and then the gap b between the first clamping member 501 and the second clamping member 502 is set according to the thermal expansion amounts.

Optionally, referring to fig. 5 and fig. 6, the laser projection mirror 000 further includes: an annular elastic sealing member 600 is disposed between the lens holder 100 and the metal side cover 300.

After the lens mount 100 and the metal side cover 300 are connected with the second clamping member 502 through the first clamping member 501, the annular elastic sealing member 600 is located between the lens mount 100 and the metal side cover 300, and the annular elastic sealing member 600 is used for sealing the laser projection lens 000, so that the phenomenon that external impurities invade the inside of the laser projection lens 000 is effectively avoided, the phenomenon that the lens group 200 is polluted by impurities is avoided, and the image resolving power of the laser projection lens 000 is better. Moreover, since the elastic sealing member 600 has a certain elasticity, when the laser projection apparatus in which the laser projection lens 000 is located operates, the lens mount 100 inside the laser projection lens 000 is heated to expand, and then the expanded lens mount 100 presses the elastic sealing member 600, so that the elastic sealing member 600 is compressed. In this way, the force between the lens holder 100 and the metal side cover 300 can be converted into the elastic force inside the compressed elastic sealing member 600, and the elastic force is uniformly distributed on the elastic sealing member 600. In this case, the elastic sealing member 600 can reduce the force between the lens holder 100 and the metal side cover 300 after the lens holder 100 expands due to heat, and prevent the lens holder 100 and the metal side cover 300 from relative displacement after the lens holder expands due to heat.

For example, the annular elastic seal 600 may be an elastic seal with a high compression ratio, for example, the annular elastic seal 600 may be an annular foam.

Assuming that the free thickness of the elastic sealing member 600 (i.e. the thickness of the elastic sealing member 600 when not compressed) is H and the limit compression thickness (i.e. the thickness of the elastic sealing member 600 after maximum compression) is H, after the lens holder 100 and the metal side cover are fastened together, when the laser projection apparatus in which the laser projection lens 000 is located is in the non-operating state (power-off state), the effective thickness of the elastic sealing member 600 is a₁When the laser projection apparatus is in a stable operation state (after a period of startup operation), the thickness of the elastic sealing member 600 is a₂. Then h < a₂＜a₁< H, i.e., the active thickness a of the elastomeric seal 600 in the rest state₁Larger than the elastic sealing member 600 in a stable operation stateThickness a of action of₂。

In a second alternative implementation manner, please refer to fig. 4 and 8, fig. 8 is a partial structural schematic view of the connecting piece in fig. 4 after connecting the lens holder and the metal side cover, the lens holder 100 has a threaded hole 100a, and the metal side cover 300 has a through hole 300b communicated with the threaded hole 100 a; the laser projection lens 000 further includes: the first end of the shoulder screw 503 has an external thread matching with the threaded hole 100a, and the first end of the shoulder screw 503 passes through the through hole 300b and then is in threaded connection with the threaded hole 100a through the external thread, the first end of the elastic element 504 abuts against the metal side cover 300, and the second end abuts against the second end of the shoulder screw 503. It should be noted that a section of the shoulder screw 503 provided with the external thread may be referred to as a threaded section 503a, and a section of the shoulder screw 503 not provided with the external thread may be referred to as a shoulder section 503 b.

For example, the elastic element 504 sleeved on the shoulder screw 503 may be a compression spring, and the compression spring may be compressed after the shoulder screw 503 passes through the through hole 300b on the metal side cover 300 and is screwed with the threaded hole 100a on the lens holder 100. The elastic force of the compression spring can be calculated by the compression amount of the compression spring, and the magnitude of the elastic force is the same as the magnitude of the acting force exerted by the shoulder screw 503 on the lens holder 100. In this way, in the design process of the laser projection lens 000, it can be determined that the shoulder screw 503 needs to apply a target acting force to the lens mount 100 on the premise of ensuring the fastening connection between the metal side cover 300 and the lens mount 100. Then, the length of the shoulder section 503b of the shoulder screw 503, the length and the elastic coefficient of the compression spring, and the like may be designed to ensure that the compression amount of the compression spring fitted to the shoulder screw 503 is a spring compression amount corresponding to the target acting force after the shoulder screw 503 is screwed to the screw hole 100a of the lens holder 100. Therefore, the probability of deformation of the lens mount 100 under the action of the shoulder screw 503 and the compression spring can be effectively reduced, and the probability of displacement of the reflector 201 on the lens mount 100 is further reduced, so that the resolution of the laser projection lens 00 is better.

Optionally, the number of the threaded holes 100a, the through holes 300b, the shoulder screws 503 and the elastic elements 504 may be multiple, and the threaded holes 100a, the through holes 300b, the shoulder screws 503 and the elastic elements 504 are arranged in a one-to-one correspondence. Illustratively, as shown in fig. 4, the number of the threaded holes 100a, the through holes 300b, the shoulder screws 503 and the elastic elements 504 is 4, the threaded holes 100a are respectively disposed at four corners of one side of the lens holder 100 close to the metal side cover 300, the through holes 300b are respectively disposed at four corners of the metal side cover 300, the through holes 300b are in one-to-one correspondence with the threaded

holes

100a, 1 elastic element 504 is sleeved on each shoulder screw 503, and each screw 503 sleeved with an elastic element 504 can pass through the corresponding through hole 300b and then is in threaded connection with the corresponding threaded hole 100 a.

Optionally, the laser projection lens 000 further includes an annular flexible sealing tape 900 located at an edge of the metal side cover 300, the flexible sealing tape 900 is located at a side of the metal side cover 300 away from the lens holder 100, and the flexible sealing tape 900 is respectively bonded to the metal side cover 300 and the lens holder 100.

The flexible sealing tape 900 is used for sealing the laser projection lens 000, so that the phenomenon that external sundries invade the inside of the laser projection lens 000 is effectively avoided, the phenomenon that the lens group 200 is polluted by the sundries is further avoided, and the laser projection lens 000 is guaranteed to have better resolving power.

Fig. 4 is a view illustrating sealing when the metal side cover 300 and the lens holder 100 are bonded by a flexible sealing tape 900. In other alternative implementations, the metal side cover 300 and the lens holder 100 may be sealed by using an elastic sealing member 600 such as that shown in fig. 5 or fig. 6, and the principle of this sealing may refer to the foregoing corresponding contents, which is not described herein again in this embodiment of the present application.

Fig. 4 is a schematic illustration of an example in which heat is dissipated from the lens projection lens 000 through the heat dissipation fins 401. In other optional implementation manners, for the laser projection lens 000 that realizes the metal side cover 300 and the lens mount 100 by the cooperation of the shoulder screw 503 and the elastic element 504, and the heat dissipation assembly 400 inside may also dissipate heat by a fan, the principle of which may refer to the foregoing corresponding contents, and the embodiment of the present application is not described herein again.

Alternatively, the material of the metal side cover 300 in the above embodiment may include: metallic materials such as metallic aluminum, metallic copper, or alloys.

The embodiment of the present application further provides a laser projection apparatus, which may include: a laser projection lens 000. The laser projection lens 000 may be the laser projection lens shown in the above embodiments. Optionally, the laser projection apparatus may further include: a light source assembly and an optical engine. For example, the light source may include: laser, fluorescence wheel, filter color wheel and reflection assembly etc.. The laser may be a blue laser. After the blue laser emits blue light, red light and green light are generated by the fluorescent wheel, and then the blue light, the red light and the green light can be reflected to the optical engine through the reflecting component after passing through the color filter wheel.

The optical engine includes: a light adjusting component, a prism component, and a Digital Micromirror Device (DMD) light valve. The light adjusting component can receive an illumination beam provided by the light source component and enables the illumination beam to be incident to the prism component; the prism assembly can receive the illumination light beam emitted from the light adjusting assembly and make the illumination light beam emitted from the light adjusting assembly incident to the light receiving surface of the DMD light valve after being reflected twice; the DMD light valve may modulate the illumination beam emitted from the prism assembly based on the image signal and reflect the modulated illumination beam to the laser projection lens 000. The laser projection lens 000 projects and images the illumination beam reflected by the DMD light valve in the optical engine through the lens group 200.

An embodiment of the present application further provides a laser projection system, as shown in fig. 9, fig. 9 is a schematic structural diagram of the laser projection system provided in the embodiment of the present application. The laser projection system may include: a laser projection device 1 and a projection screen 2. The laser projection apparatus 1 may be the laser projection apparatus shown in the above-described embodiment. The laser projection apparatus 1 may emit light obliquely upward so that the laser projection apparatus 1 may project a picture to the projection screen 2.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is only exemplary of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A laser projection lens, comprising:

a lens mount;

a lens group on the lens mount, the lens group comprising: a mirror;

2. The laser projection lens of claim 1,

the heat dissipation assembly includes: and the side of the metal side cover, which is far away from the reflector, is fixedly connected with a plurality of radiating fins.

3. The laser projection lens of claim 1,

the metal side cover has a vent, the heat dissipation assembly includes: the fan comprises a support fixedly connected with the metal side cover and a fan movably connected with the support, wherein the air outlet surface of the fan faces the ventilation opening.

4. The laser projection lens of any of claims 1 to 3,

the laser projection lens further includes: the first clamping piece is positioned on the lens mount, and the second clamping piece is positioned on the metal side cover and clamped with the first clamping piece.

5. The laser projection lens of claim 4,

after the first clamping piece and the second clamping piece are clamped, a gap is formed between the first clamping piece and the second clamping piece.

6. The laser projection lens of claim 4,

the laser projection lens further includes: and the annular elastic sealing element is positioned between the lens seat and the metal side cover.

7. The laser projection lens of any of claims 1 to 3,

the lens mount is provided with a threaded hole, and the metal side cover is provided with a through hole communicated with the threaded hole;

the laser projection lens further includes: the first end of the shaft shoulder screw is provided with an external thread matched with the threaded hole, the first end of the shaft shoulder screw penetrates through the through hole and then passes through the external thread and is in threaded connection with the threaded hole, the first end of the elastic element is abutted against the metal side cover, and the second end of the elastic element is abutted against the second end of the shaft shoulder screw.

8. The laser projection lens of claim 7,

the elastic element is a compression spring.

9. The laser projection lens of claim 7,

the laser projection lens further includes: the flexible sealing adhesive tape is positioned on one side of the metal side cover, which is far away from the lens mount, and the flexible sealing adhesive tape is respectively bonded with the metal side cover and the lens mount.

10. A laser projection device, comprising: the laser projection lens of any of claims 1 to 9.