CN112904651A

CN112904651A - Laser projection device

Info

Publication number: CN112904651A
Application number: CN201911137406.3A
Authority: CN
Inventors: 侯乃文
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2021-06-04

Abstract

A laser projection device is disclosed, which belongs to the projection technology field. The laser projection equipment comprises a light source, an optical machine and a lens; the optical machine comprises a shell, wherein a digital micromirror device is arranged on the shell; the back side of the digital micromirror device is connected and fixed with the circuit board, a fixed plate is stacked on the circuit board, the fixed plate is fixed with the circuit board and the shell through a first group of screws, the fixed plate and the circuit board are provided with openings, and the digital micromirror device is exposed out of the openings; the fixing plate is provided with a first group of screws, the shell is fixed with the fixing plate through a first group of screws, the fixing plate is provided with a second group of screws, the cooling component comprises a cooling terminal, and the cooling terminal penetrates through the fixing plate and the opening of the circuit board to conduct heat with the back of the digital micromirror device. The problem of among the correlation technique cooling module when taking place to rock, can drive digital micromirror device position and take place the skew is solved. The effect of improving the firmness of the installation of the digital micromirror device is achieved.

Description

Laser projection device

Technical Field

The present disclosure relates to the field of projection technologies, and in particular, to a laser projection apparatus.

Background

A Digital Micromirror Device (DMD) is applied to a laser projection apparatus and is mounted on a housing of the laser projection apparatus for processing light.

One laser projection device in the related art includes a cooling component and 4 screws, where the cooling component has 4 through holes, and the 4 screws penetrate through the 4 through holes to be in threaded connection with a housing of the laser projection device, so that the cooling component presses the DMD on the housing of the laser projection device.

But cooling module is heavier usually, and when laser projection equipment rocked, cooling module took place thereupon and rocked, and then leads to DMD's position to take place the skew easily, causes comparatively serious optical problem.

Disclosure of Invention

The embodiment of the disclosure provides a laser projection device, which can solve the problem that the DMD position is easy to deviate in the related art. The technical scheme is as follows:

according to a first aspect of the present disclosure, there is provided a laser projection apparatus, characterized by comprising a light source for providing an illumination beam; the optical machine is used for modulating the image signals of the illumination light beams; the lens is used for projecting and imaging the modulated illumination light beam;

the optical machine comprises a shell, a plurality of optical lenses are accommodated in the shell, and a digital micromirror device is mounted on the shell;

the front surface of the digital micromirror device is a light receiving surface and faces the inside of the shell, and the back surface of the digital micromirror device is connected and fixed with the circuit board;

a fixing plate is stacked on the circuit board and fixed with the circuit board and the shell through a first group of screws, openings are formed in the fixing plate and the circuit board, and the digital micromirror device is exposed out of the openings;

the fixing plate top still is provided with cooling module, cooling module with the casing passes through the second group screw fixation, cooling module includes cooling terminal, cooling terminal passes the fixing plate and the opening of circuit board with the back of digital micro mirror device carries out heat-conduction.

Optionally, the back surface of the dmd has a carrying area and a heat dissipation area, the circuit board abuts against the carrying area to press the dmd on the housing, and the cooling terminal contacts with the heat dissipation area.

Optionally, the first set of screws includes at least four first screws, the fixing plate has at least four first through holes, and the four first screws penetrate through the at least four first through holes in a one-to-one correspondence manner and are in threaded connection with the housing.

Optionally, each first screw includes a screw rod, a screw head located at one end of the screw rod, and a spring sleeved on the screw rod, one end of the spring abuts against the screw head, and the other end of the spring abuts against the fixing plate.

Optionally, an orthographic projection of the cooling assembly on the housing does not overlap with an orthographic projection of the at least four first screws on the housing.

Optionally, the second set of screws includes at least four second screws, the cooling assembly has at least four second through holes, and the four first screws penetrate through the at least four second through holes in a one-to-one correspondence manner and are in threaded connection with the housing.

Optionally, each second screw includes a screw rod, a screw head located at one end of the screw rod, and a spring sleeved on the screw rod, one end of the spring abuts against the screw head, and the other end of the spring abuts against the cooling assembly.

Optionally, an orthographic projection of the at least four second screws on the housing does not overlap with an orthographic projection of the fixing plate on the housing.

Optionally, the sum of the pressure applied by the fixing plate to the bearing area and the pressure applied by the cooling terminal to the heat dissipation area is less than the design bearing pressure of the digital micromirror device.

Optionally, the fixing plate applies a pressure to the carrier region that is greater than twice a pressure applied by the cooling terminal to the heat dissipation region.

Optionally, a circuit board is disposed on the housing, the digital micromirror device is located on the circuit board, and the fixing plate fixes the digital micromirror device and the circuit board on the housing.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

the present disclosure provides a laser projection device,

including the fixed plate, the fixed plate is fixed the digital micromirror device on the casing alone, and cooling module also is fixed alone with the casing, and cooling terminal wherein contacts through the opening on fixed plate and the circuit board and the heat dissipation area of digital micromirror device to realize radiating function, under this structure, cooling module and digital micromirror device have carried out fixedly with the casing respectively. The problem of among the correlation technique cooling module when taking place to rock, can drive digital micromirror device position and take place the skew is solved. The effect of improving the firmness of the installation of the digital micromirror device is achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, 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 disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a structural diagram of an optical engine in a laser projection apparatus according to an embodiment of the present disclosure;

fig. 2 is an overall structural diagram of a laser projection apparatus provided in an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a separating structure of an optical engine in the laser projection apparatus shown in FIG. 2;

FIG. 4 is a top view of the back side of the digital micromirror device in the optical bench of FIG. 1;

FIG. 5 is a schematic diagram of a first screw and its connecting components in the optical-mechanical device shown in FIG. 3;

FIG. 6 is a top view of the fixed plate shown in FIG. 5;

FIG. 7 is a top view of an optical engine of the laser projection device of FIG. 1;

FIG. 8 is a left side view of an optical engine of the laser projection device of FIG. 7;

FIG. 9 is a top view of the cooling assembly of the light engine of FIG. 8;

FIG. 10 is a schematic diagram of the positions of at least four second screws and a digital micromirror device fixing plate in the optical machine of FIG. 2;

FIG. 11 is an exploded view of the optical engine of the laser projection device of FIG. 2;

fig. 12 is an assembly structure diagram of the optical machine shown in fig. 3.

With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

At present, in a laser projection device, the laser projection device includes a cooling component and 4 screws, the cooling component has 4 through holes, and the 4 screws penetrate through the 4 through holes to be in threaded connection with the projection device housing, so that the cooling component presses the DMD on the projection device housing.

However, because cooling module is heavier usually, when projection equipment rocked, cooling module takes place to rock thereupon, and cooling module and digital micro mirror device adopt the fixed installation device of integral type, lead to digital micro mirror device to be driven by cooling module easily and take place offset, cause comparatively serious optical problem.

Fig. 1 is a structural diagram of an optical engine in a laser projection apparatus according to an embodiment of the present disclosure. A laser projection device comprising a light source (not shown in fig. 1) for providing an illumination beam; an optical machine 10 for modulating the image signal of the illumination beam; and a lens (not shown in fig. 1) for projecting and imaging the modulated illumination beam.

The optical engine 10 includes a housing 17, a plurality of optical lenses (not shown in fig. 1) are disposed in the housing 17, and the digital micromirror device 15 is mounted on the housing 17.

The front surface of the digital micromirror device 15 is a light receiving surface facing the inside of the housing 17, the back surface of the digital micromirror device 15 is connected and fixed with the circuit board 16, the fixing plate 11 is stacked on the circuit board 16, the fixing plate 11 is fixed with the circuit board 16 and the housing 17 through the first set of screws 13, the fixing plate 11 and the circuit board 16 are both provided with openings, the fixing plate 11 is provided with an opening a, the circuit board 16 is provided with an opening b, and the digital micromirror device 15 is exposed at the opening a and the opening b.

A cooling assembly 12 is further disposed above the fixing plate 11, the cooling assembly 12 is fixed to the housing 17 by a second set of screws 14, the cooling assembly 12 includes a cooling terminal 122, and the cooling terminal 122 is thermally conducted to the back surface of the digital micromirror device 15 through an opening a of the fixing plate 11 and an opening b of the circuit board 16.

Fig. 2 is an overall structural diagram of a laser projection apparatus provided in an embodiment of the present disclosure, and the laser projection apparatus 100 may include a light source 20, an optical engine 10, and a lens 30. The light source 20 is configured to provide an illumination light beam, the optical engine 10 is configured to perform image signal modulation on the illumination light beam, and the lens 30 is configured to perform projection imaging on the modulated illumination light beam. Wherein the structure of the optical engine 10 can be as shown in fig. 1.

To sum up, the embodiment of the present disclosure provides a laser projection apparatus, including the fixed plate, the fixed plate fixes the digital micromirror device on the casing alone, and cooling module also fixes with the casing alone, and cooling terminal wherein passes through the opening on fixed plate and the circuit board and contacts with the heat dissipation area of digital micromirror device to realize radiating function, under this structure, cooling module and digital micromirror device have carried out fixedly with the casing respectively. The problem of among the correlation technique cooling module when taking place to rock, can drive digital micromirror device position and take place the skew is solved. The effect of improving the firmness of the installation of the digital micromirror device is achieved.

Fig. 3 is a schematic diagram of a separated structure of an optical engine in the laser projection apparatus shown in fig. 2.

The fixing plate 11 fixes the digital micromirror device 15 to the circuit board 16 and the housing 17 by at least four first screws 13, the heat dissipation area of the digital micromirror device 15 is exposed in the openings of the fixing plate 11 and the circuit board 16, the cooling assembly 12 is fixed to the housing 17 by at least four second screws 14, the cooling assembly includes a cooling terminal, and the cooling terminal passes through the openings of the fixing plate 11 and the circuit board 16 and contacts with the heat dissipation area of the digital micromirror device 15.

Alternatively, as shown in fig. 4, it is a top view of the back surface of the dmd 15 in the optical bench shown in fig. 1. The back surface of the dmd 15 has a carrying region 152 and a heat dissipation region 151, the circuit board 16 abuts against the carrying region 152 to press the dmd 15 against the housing 17, and the cooling terminals 122 are in contact with the heat dissipation region 151.

Optionally, as shown in fig. 5, it is a schematic structural diagram of the first screw and the connecting component thereof in the optical machine shown in fig. 3. The first set of screws 130 includes at least four first screws 13, the fixing plate 11 has at least four first through holes 111, and the at least four first screws 13 correspondingly penetrate through the at least four first through holes 111 one by one and are in threaded connection with the housing 17.

Wherein each first screw 13 may be a shoulder screw. The fixing plate 11 presses the dmd 15 against the housing 17 by the first screw 13. The circuit board 16 may have at least four through holes, and the at least four first screws 13 may first pass through the four first through holes in a one-to-one correspondence, then pass through the at least four through holes on the circuit board 16, and be screwed with the housing 17.

Each first screw 13 includes a screw 131, a screw head 132 at one end of the screw 131, and a spring 133 sleeved on the screw 131, wherein one end of the spring 133 abuts against the screw head 132, and the other end abuts against the fixing plate 11.

One end of the spring 133 abuts against the screw head 132, and the other end abuts against the fixing plate 11, so that the magnitude of the force applied to the digital micromirror device 15 by the spring 133 can be accurately determined according to the relationship between the deformation of the spring 133 and the force applied thereto when the first screw 13 is rotated.

Fig. 6 is a plan view of the fixing plate 11 shown in fig. 5. The first through holes 111 may be located at four corners of the fixing plate 11.

The laser projection device 100 provided by the embodiment of the present disclosure can fix the fixing plate 11 and the digital micromirror device 15 on the housing 17 through the at least four first screws 13 and the at least four first through holes 111 on the fixing plate 11 when in use, and can avoid the problem that the digital micromirror is driven to shift when the cooling component shakes.

Fig. 7 is a top view of the optical engine 10 of the laser projection apparatus shown in fig. 1. Wherein the orthographic projection of the cooling assembly 12 on the housing 17 does not overlap with the orthographic projection of the at least four first screws 13 on the housing 17. By adopting the structure, the cooling component 12 can be prevented from shielding at least four first screws 13, and the negative effects of damage and the like of the cooling component 12 caused by the at least four first screws 13 can also be avoided.

Fig. 8 is a left side view of the optical engine 10 in the laser projection apparatus shown in fig. 7. The second set of screws 140 includes at least four second screws 14, the cooling assembly 12 has at least four second through holes, and the four second screws 14 correspondingly penetrate through the at least four second through holes 121 and are in threaded connection with the housing 17.

Wherein, the cooling module 12 is fixed with the housing 17 by the second screw 14, and the fixing plate 11, the circuit board 16 and the digital micro-mirror device 15 are arranged between the cooling module 12 and the housing 17. The cooling terminal 122 of the cooling module 12 is in contact with the dmd 15 through the fixing plate 11 and the circuit board 16.

Each second screw 14 includes a screw rod 141, a screw head 142 at one end of the screw rod 141, and a spring 143 fitted over the screw rod 141, one end of the spring 143 abutting against the screw head 142, and the other end abutting against the cooling assembly 12.

One end of the spring 143 abuts against the screw head 142, and the other end abuts against the cooling assembly 12, so that the magnitude of the force applied to the digital micromirror device 15 by the spring 143 through the cooling terminal 122 can be accurately judged according to the relationship between the deformation of the spring 143 and the force applied thereto when the second screw 14 is rotated.

Fig. 9 is a top view of the cooling module 12 in the optical bench of fig. 8. Wherein the second through holes 121 may be located at corners of the cooling module 12.

In the embodiment of the present disclosure, each second screw may be the same screw as the first screw, or may be a screw different from the first screw, and the embodiment of the present disclosure is not limited in any way.

The cooling assembly is in threaded connection with the shell through the at least four second screws and the at least four second through holes, so that the problem that the cooling assembly drives the digital micromirror device to generate position deviation when the cooling assembly and the digital micromirror device are installed by using a group of screws can be avoided.

Fig. 10 is a schematic diagram showing positions of at least four second screws and a dmd fixing plate in the optical machine shown in fig. 2. Wherein, the orthographic projection of the at least four second screws 14 on the shell 17 is not overlapped with the orthographic projection of the fixing plate 11 on the shell 17.

The structure can ensure that the cooling component 12 fixed by the at least four second screws 14 and the digital micro-mirror device 15 are separately fixed on the shell 17, and the negative influence caused by integrally fixing the cooling component 12 and the digital micro-mirror device 15 is avoided.

Fig. 11 is an exploded view of the optical engine 10 of the laser projection apparatus shown in fig. 2. Wherein the sum of the pressure applied by the fixing plate 11 to the carrying region 152 and the pressure applied by the cooling terminal (not shown) to the heat dissipation region 151 is smaller than the design carrying pressure of the digital micromirror device 15.

The pressure applied by the fixing plate 11 to the bearing region 152 and the pressure applied by the cooling terminal (not shown in the figure) to the heat dissipation region 151 can be precisely controlled by the relationship between the force applied by the spring 133 and the spring 143 and the characteristics thereof, and the sum of the two pressures is smaller than the design bearing pressure of the digital micromirror device 15, so as to avoid the damage to the digital micromirror device 15 caused by the sum of the two pressures being larger than the design bearing pressure of the digital micromirror device 15.

Alternatively, the pressure applied by the fixing plate 11 to the bearing region 152 is more than twice the pressure applied by the cooling terminal (not shown) to the heat dissipation region 151.

The pressure applied by the fixing plate 11 to the bearing region 152 is much greater than the pressure applied by the cooling terminal (not shown) to the heat dissipation region 151, which is more beneficial to protecting the digital micromirror device 15, and meanwhile, when the cooling terminal (not shown) contacting the heat dissipation region 151 is driven by the cooling assembly 12, the cooling terminal (not shown) drives the digital micromirror device 15, so that the digital micromirror device 15 can be fixed more firmly.

Fig. 12 is an assembly structure diagram of the optical machine shown in fig. 3. The fixed plate 11 and the cooling block 12 are fixed to the housing 17.

Taking the laser projection apparatus shown in fig. 3 as an example, the step of mounting the digital micromirror device in any one of the laser projection apparatuses provided by the present disclosure may include:

1) fixing a fixed plate on a shell of the projection equipment;

when the fixing plate 11 is fixed on the housing 17 of the projection apparatus, the heat dissipation area 151 of the dmd 15 is exposed at the opening a of the fixing plate 11 and the opening b of the circuit board 16, so that the cooling terminals of the cooling assembly 12 are subsequently brought into contact with the heat dissipation area 151 of the dmd 15 through the two openings to perform heat dissipation processing on the dmd 15. The fixing plate 11, the dmd 15 and the circuit board are fixed on the housing 17 by at least four first screws 13 and at least four first through holes 111 on the fixing plate 11, and the circuit board 16 abuts against the bearing region 151 to press the dmd 15 against the housing 17, during which the magnitude of the force applied to the bearing region 152 of the dmd 15 can be accurately controlled by the spring 133.

2) Fixing the cooling assembly on a shell of the projection equipment;

the cooling module 12 is placed above the fixing plate 11 so that the orthographic projection of the cooling module 12 on the housing 17 does not overlap with the orthographic projection of the at least four first screws 13 on the housing 17, and the orthographic projection of the at least four second screws 14 on the housing 17 does not overlap with the orthographic projection of the fixing plate 11 on the housing 17, while the cooling terminals of the cooling module 12 are in contact with the heat dissipation area 151 of the digital micromirror device 15 through the openings a of the fixing plate 11 and the openings b of the circuit board, and the cooling module 12 is fixed on the housing 17 through the at least four second screws 14 and the at least four second through holes 121 on the cooling module 12, during which the magnitude of the force applied to the heat dissipation area 151 of the digital micromirror device 15 can be accurately controlled by the springs 143.

By applying the laser projection equipment provided by the embodiment of the disclosure, the problem that the position of a digital micromirror device is driven to deviate when a cooling assembly shakes in the related technology can be avoided. The effect of improving the firmness of the installation of the digital micromirror device is achieved.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A laser projection device (100) comprising a light source (20) for providing an illumination beam; an optical machine (10) for image signal modulation of the illumination beam; a lens (30) for projecting and imaging the modulated illumination beam;

the optical machine (10) comprises a shell (17), a plurality of optical lenses are arranged in the shell (17), and a digital micro-mirror device (15) is installed on the shell (17);

the front surface of the digital micro-mirror device (15) is a light receiving surface and faces the inside of the shell (17), and the back surface of the digital micro-mirror device (15) is connected and fixed with a circuit board (16);

a fixing plate (11) is stacked on the circuit board (16), the fixing plate (11) is fixed with the circuit board (16) and the shell (17) through a first group of screws (130), the fixing plate (11) and the circuit board (16) are provided with openings, and the digital micromirror device (15) is exposed out of the openings;

the cooling module (12) is further arranged above the fixing plate (11), the cooling module (12) and the shell (17) are fixed through a second group of screws (140), the cooling module (12) comprises a cooling terminal (122), and the cooling terminal (122) penetrates through openings of the fixing plate (11) and the circuit board (16) to conduct heat with the back face of the digital micromirror device (15).

2. The laser projection device (100) according to claim 1, wherein the back side of the dmd (15) has a carrying region (152) and a heat dissipation region (151), the circuit board (16) abuts against the carrying region (152) to press the dmd (15) against the housing (17), and the cooling terminal (122) is in contact with the heat dissipation region (151).

3. The laser projection device (100) according to claim 1, wherein the first set of screws (130) comprises at least four first screws (13), the fixing plate (11) has at least four first through holes (111), and the four first screws (13) are respectively inserted through the at least four first through holes (111) in a one-to-one correspondence manner and are in threaded connection with the housing (17).

4. A laser projection device (100) according to claim 3, wherein each first screw (13) comprises a screw (131), a screw head (132) at one end of the screw (131), and a spring (133) sleeved on the screw (131), wherein one end of the spring (133) abuts against the screw head (132) and the other end abuts against the fixing plate (11).

5. The laser projection device (100) according to claim 3, wherein an orthographic projection of the cooling assembly (12) on the housing (17) does not overlap with an orthographic projection of the at least four first screws (13) on the housing (17).

6. The laser projection device (100) according to claim 1, wherein the second set of screws (140) comprises at least four second screws (14), the cooling assembly (12) has at least four second through holes (121), and the four second screws (14) are threaded through the at least four second through holes (121) in a one-to-one correspondence manner and are in threaded connection with the housing (17).

7. The laser projection device (100) according to claim 6, wherein each of the second screws (14) comprises a screw (141), a screw head (142) at one end of the screw (141), and a spring (143) sleeved on the screw (141), wherein one end of the spring (143) abuts against the screw head (142) and the other end abuts against the cooling assembly (12).

8. The laser projection device (100) according to claim 6, wherein an orthographic projection of the at least four second screws (14) on the housing (17) does not overlap with an orthographic projection of the fixation plate (11) on the housing (17).

9. The laser projection device (100) according to claim 2, wherein the sum of the pressure applied by the fixture plate (11) to the bearing region (152) and the pressure applied by the cooling terminal (122) to the heat dissipation region (151) is less than the design bearing pressure of the digital micromirror device (15).

10. The laser projection device (100) according to claim 9, wherein the pressure exerted by the fixation plate (11) on the bearing region (152) is greater than twice the pressure exerted by the cooling terminal (122) on the heat dissipation region (151).