CN112824967A

CN112824967A - Laser projection device

Info

Publication number: CN112824967A
Application number: CN201911136299.2A
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: 2021-05-21
Anticipated expiration: 2039-11-19
Also published as: CN112824967B

Abstract

The application discloses laser projection equipment relates to projection display technical field. The embodiment of the application provides a laser projection device, which can comprise: light source, ray apparatus and camera lens. Light adjusting assembly in the ray apparatus, prism subassembly and digital micro mirror device all are located the holding intracavity that the casing formed, and digital micro mirror device sets up at the top of casing, and prism subassembly sets up in the bottom of casing, and the optical axis of the illuminating beam that the light source sent, and the difference in height between the prism subassembly is less, and the longitudinal dimension of ray apparatus is less, and the shared space of ray apparatus is less, and then makes the shared space of laser projection equipment less.

Description

Laser projection device

Technical Field

The application relates to the technical field of projection display, in particular to laser projection equipment.

Background

Laser projection devices typically include: light source assembly, illumination assembly and imaging assembly. The light beam that this light source subassembly produced can show the image on this formation of image subassembly after illumination subassembly to formation of image subassembly.

In the related art, the light source module may be a laser, and the imaging module may be a lens. The illumination assembly includes a plurality of lenses, a prism, and a Digital Micromirror Device (DMD). The light beam generated by the laser passes through a plurality of lenses and prisms in sequence, is finally reflected by the digital micromirror device and irradiates into the lens.

An illumination path of an axisymmetric total-reflection prism in the optical machine shown in fig. 1 is schematically illustrated, and an optical engine structure using the axisymmetric total-reflection prism illumination path shown in fig. 2 is schematically illustrated.

An axisymmetric total reflection (TIR) prism 01 includes two prisms, the size of which is usually 5 cm × 4 cm, and for a DLP (digital light processing) ultra-short focus lens 02, a light receiving surface of a DMD 03 and a light incident surface of the lens 02 are parallel and offset, so that an illumination beam reflected by the DMD 03 enters the lens 02 at a certain angle instead of an asymmetric light cone, and finally the illumination beam is emitted to a projection screen in an oblique direction, thereby realizing a small projection ratio. In this illumination light path, the height of the lens 02 determines the position where the DMD 02 is mounted, and also determines the position where the TIR 01 is mounted.

As shown in fig. 1 and fig. 2, since the DMD 03 is parallel to and offset from the light incident surface of the lens 02, the DMD 03 needs to be disposed on the other side of the housing 04 of the optical engine opposite to the lens 02, and the TIR 01 is used to receive the illumination beam incident at a certain angle, reflect the illumination beam to the surface of the DMD 03, transmit the illumination beam reflected by the DMD 03, and irradiate the illumination beam to the light incident surface of the lens 02 parallel to the surface of the DMD 03.

Since the TIR 01 needs to be disposed close to the DMD 03 surface, the TIR 01 is mounted at the side of the housing of the light engine. The illumination optical component (such as the light collecting lens 05) of the optical engine is usually disposed at the bottom of the housing 04 of the optical engine, and the optical axis of the illumination light beam has a large height difference h from the TIR 01. Moreover, in order to enlarge the illumination light beam to match the area and the uniformity of the surface of the DMD 03, the illumination light beam needs to overcome the large height difference to perform high-quality illumination light beam transmission, which results in more lenses in the illumination optical assembly, a large transverse dimension of the optical engine, a large longitudinal dimension of the optical engine caused by the height difference between the optical axis of the light beam and the TIR 01, and a large space occupied by the optical engine.

Disclosure of Invention

The application provides a laser projection equipment can connect the great problem of ray apparatus occupation space among the relevant art laser projection equipment. The technical scheme is as follows:

there is provided a laser projection device comprising:

a light source for providing an illumination beam;

the optical machine is used for modulating the image signal of the illumination light beam;

the lens is used for projecting and imaging the modulated illumination light beam;

the optical machine comprises a shell, wherein the shell forms an accommodating cavity, and the accommodating cavity comprises a light adjusting assembly, a prism assembly and a digital micro-mirror device;

the light adjusting component is used for receiving and adjusting the angle or the size of the illumination light beam and enabling the illumination light beam to be incident to the prism component;

the prism assembly is arranged at the bottom of the shell and used for receiving the illumination light beams emitted by the optical adjusting assembly and reflecting the illumination light beams emitted by the optical adjusting assembly twice and then emitting the illumination light beams to the light receiving surface of the digital micromirror device;

the digital micromirror device is arranged at the top of the shell, a light receiving surface of the digital micromirror device faces the accommodating cavity, the light receiving surface of the digital micromirror device reflects the illumination light beams emitted by the prism assembly and then enters the prism assembly again, and the prism assembly is also used for reflecting the illumination light beams reflected by the digital micromirror device for the third time so as to project the illumination light beams into the lens;

the vertical axis of the light receiving surface of the digital micromirror device is perpendicular to the optical axis of the light incident surface of the lens.

The beneficial effect that technical scheme that this application provided brought includes at least:

the application provides a laser projection equipment, and the embodiment of the application provides a laser projection equipment, and this laser projection equipment can include: light source, ray apparatus and camera lens. Light adjusting assembly in the ray apparatus, prism subassembly and digital micro mirror device all are located the holding intracavity that the casing formed, and digital micro mirror device sets up at the top of casing, and prism subassembly sets up in the bottom of casing, and the optical axis of the illuminating beam that the light source sent, and the difference in height between the prism subassembly is less, and the longitudinal dimension of ray apparatus is less, and the shared space of ray apparatus is less, and then makes the shared space of laser projection equipment less.

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 a schematic diagram of an illumination path of an axisymmetric total-reflection prism in a light engine of the related art;

FIG. 2 is a schematic diagram of an optical engine employing an axisymmetric total-reflection prism illumination path according to the related art;

FIG. 3 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present application;

FIG. 4 is a front view of the laser projection device shown in FIG. 3;

FIG. 5 is a schematic structural diagram of another laser projection apparatus provided in an embodiment of the present application;

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

FIG. 7 is a schematic optical path diagram of a laser projection apparatus provided in an embodiment of the present application;

FIG. 8 is a schematic optical path diagram of another laser projection apparatus provided in an embodiment of the present application;

FIG. 9 is a schematic partial structural diagram of a laser projection apparatus according to an embodiment of the present disclosure;

fig. 10 is a top view of a prism assembly provided by an embodiment of the present application;

fig. 11 is a schematic structural diagram of a prism holder according to an embodiment of the present disclosure;

FIG. 12 is a schematic diagram of another prism holder according to an embodiment of the present disclosure;

FIG. 13 is a schematic partial structure diagram of another laser projection apparatus provided in an embodiment of the present application;

FIG. 14 is a schematic optical path diagram of a laser projection apparatus provided in an embodiment of the present application;

FIG. 15 is a schematic structural diagram of an optical engine in a laser projection apparatus according to an embodiment of the present disclosure;

fig. 16 is a schematic overall structure diagram of a laser projection apparatus according to an embodiment of the present application;

FIG. 17 is a schematic diagram of a separating structure of an optical engine in the laser projection apparatus shown in FIG. 16;

FIG. 18 is a top view of the back side of the digital micromirror device in the optical bench of FIG. 15;

FIG. 19 is a schematic diagram of the first screw and its connecting part of the opto-mechanical device shown in FIG. 17;

fig. 20 is a top view of the fixing plate shown in fig. 19;

FIG. 21 is a top view of an optical engine of the laser projection device shown in FIG. 15;

FIG. 22 is a left side view of an optical engine of the laser projection device of FIG. 21;

FIG. 23 is a top view of the cooling assembly of the light engine of FIG. 22;

FIG. 24 is a schematic diagram of the positions of at least four second screws and a DMD mounting plate in the optical bench of FIG. 16;

FIG. 25 is an exploded view of the optical engine of the laser projection device shown in FIG. 16;

FIG. 26 is a schematic diagram of an assembly structure of the optical-mechanical device shown in FIG. 17;

FIG. 27 is a schematic structural diagram of a light pipe fixture according to an embodiment of the present disclosure;

FIG. 28 is a schematic structural diagram of another light pipe fixture according to an embodiment of the present disclosure;

fig. 29 is a schematic structural diagram of an exterior of a housing in a laser projection apparatus according to an embodiment of the present application;

FIG. 30 is a schematic view of a light pipe carrying assembly of the light pipe fixing apparatus according to the embodiment of the present application;

FIG. 31 is a schematic diagram of a mounting assembly of the light pipe mounting apparatus according to an embodiment of the present disclosure;

FIG. 32 is a schematic partial structure diagram of another laser projection apparatus provided in an embodiment of the present application;

FIG. 33 is a schematic perspective view of the galvanometer of FIG. 32;

FIG. 34 is a schematic diagram illustrating a partially exploded view of a laser projection apparatus according to an embodiment of the present disclosure;

FIG. 35 is a schematic view of the construction of the first flexible mat of FIG. 34;

figure 36 is a cross-sectional view of the galvanometer of figure 34.

Detailed Description

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

Fig. 3 is a schematic structural diagram of a laser projection apparatus according to an embodiment of the present application. Fig. 4 is a front view of the laser projection device shown in fig. 3. Fig. 5 is a schematic structural diagram of another laser projection apparatus provided in an embodiment of the present application. Fig. 6 is a schematic structural diagram of another laser projection apparatus provided in an embodiment of the present application. As can be seen in conjunction with fig. 3 to 6, the laser projection apparatus may include: a light source 101, an optical engine 102 and a lens 103. The light source 101 may be used to provide an illumination beam. The optical engine 102 may be used to modulate the illumination beam with an image signal. The lens 103 may be used to project the modulated illumination beam into an image.

The optical engine 102 may include a housing 1021, and the housing 1021 may form a receiving cavity 1021a, and the receiving cavity 1021a includes a light adjustment assembly 1022, a prism assembly 1023, and a digital micromirror device 1024. The light adjustment assembly 1022 can be used to receive and adjust the angle or size of the illumination beam and to inject the illumination beam into the prism assembly 1023. The prism assembly 1023 may be disposed at the bottom of the housing 1021, and the prism assembly 1023 may be configured to receive the illumination light beam emitted by the optical adjustment assembly 1022, and reflect the illumination light beam emitted by the optical adjustment assembly 1022 twice and then enter the light receiving surface 1024a of the digital micro-mirror device 1024.

The digital micromirror device 1024 may be disposed on the top of the housing 1021, a light receiving surface 1024a of the digital micromirror device 1024 may face into the accommodating cavity 1021a, and the light receiving surface 1024a of the digital micromirror device 1024 may reflect the illumination light beam emitted from the prism assembly 1023 and then enter the prism assembly 1023 again. The prism assembly 1023 can be used to reflect the illumination beam reflected by the digital micromirror device 1024a third time for projection into the lens 103.

The vertical axis of the light receiving surface 1024a of the dmd 1024 is perpendicular to the optical axis of the light incident surface of the lens 103.

Since the digital micromirror device 1024 in the embodiment of the present application is disposed on the top of the housing 1021, the prism assembly 1023 is disposed on a side of the digital micromirror device 1024 away from the top of the housing 1021, a height difference between an optical axis of an illumination light beam emitted from the light source 101 and the prism assembly 1023 is small, and a vertical axis of a light receiving surface 1024a of the digital micromirror device 1024 is perpendicular to an optical axis of a light incident surface of the lens 103, a longitudinal dimension of the optical engine 102 is small. Moreover, because the longitudinal size of the optical machine 102 is small, the number of lenses in the light receiving lens can be reduced, the space occupied by the optical machine 102 is small, and further the space occupied by the laser projection equipment is small.

It should be noted that the digital micromirror device 1024 can be disposed at the bottom of the casing 1021, and the digital micromirror device 1024 is not shown in fig. 5 because the prism assembly 1023 in fig. 5 shields the digital micromirror device 1024. In order to show the positional relationship between the digital micromirror device 1024 and the prism assembly 1023, the housing 1021 is not shown in the laser projection apparatus shown in fig. 6.

In summary, the embodiment of the present application provides a laser projection apparatus, which may include: light source, ray apparatus and camera lens. Light adjusting assembly in the ray apparatus, prism subassembly and digital micro mirror device all are located the holding intracavity that the casing formed, and digital micro mirror device sets up at the top of casing, and prism subassembly sets up in the bottom of casing, and the optical axis of the illuminating beam that the light source sent, and the difference in height between the prism subassembly is less, and the longitudinal dimension of ray apparatus is less, and the shared space of ray apparatus is less, and then makes the shared space of laser projection equipment less.

Fig. 7 is a schematic optical path diagram of a laser projection apparatus according to an embodiment of the present application. Referring to fig. 7, the prism assembly 1023 may include: a first prism 10231 and a second prism 10232. The optical path of the laser projection equipment is as follows: the illumination light beam provided by the light source 101 passes through the light adjusting assembly 1022, enters the first prism 10231 from the light incident surface 10231a of the first prism 10231, is reflected by the emitting surface 10231b of the first prism 10231 and the reflecting surface 10232b of the first prism 10231 in sequence, enters the second prism 10232, exits from the digital micromirror arrangement surface 10232a of the second prism 10232 to the light receiving surface 1024a of the digital micromirror device 1024, reflects the illumination light beam on the light receiving surface 1024a of the digital micromirror device 1024, enters the second prism 10232, and reflects the illumination light beam on the light reflecting surface 10232b of the second prism 10232, and enters the lens from the light emitting surface 10232c of the second prism 10232.

Fig. 8 is a schematic optical path diagram of another laser projection apparatus provided in an embodiment of the present application. Referring to fig. 8, the prism assembly 1023 may further include: the third prism 10233. The third prism 10233 may be positioned between the exit surface 10231b of the first prism 10231 and the reflective surface 10232b of the second prism 10232.

In this embodiment, an included angle between the illumination light beam incident on the light incident surface 10231a of the first prism 10231 and the illumination light beam exiting from the light exiting surface 10232c of the second prism 10232 is smaller than a first included angle threshold, which may be equal to 20 degrees. That is, an included angle between the illumination light beam incident on the light incident surface 10231a of the first prism 10231 and the illumination light beam emitted from the light emitting surface 10232c of the second prism 10232 is less than 20 degrees. The included angle between the illumination beam incident on the light incident surface 10231a of the first prism 10231 and the illumination beam emergent from the light emergent surface 10232c of the second prism 10232 is small, so that the light adjusting assembly 1022, the prism assembly 1023 and the lens 103 can be arranged in a linear manner, the layout of the laser projection equipment is more compact, and the space occupied by the laser projection equipment is reduced.

For example, an included angle between the illumination light beam incident on the light incident surface 10231a of the first prism 10231 and the illumination light beam emitted from the light emitting surface 10232c of the second prism 10232 is 0 degree, that is, the illumination light beam incident on the light incident surface 10231a of the first prism 10231 and the illumination light beam emitted from the light emitting surface 10232c of the second prism 10232 can be parallel or coincident.

Alternatively, the reflective surface 10232b of the first prism 10231 may be a curved reflective surface. This curved reflecting surface 10232b can be used to shape the illumination beam on the one hand, and the lens used to shape the illumination beam can be disposed between light source 101 and prism assembly 1023 without the need to reduce the number of parts included in the laser projection apparatus, thereby reducing the space occupied by the laser projection apparatus. On the other hand, when the illumination light beam enters the first prism 10231 through the light incident surface 10231a of the first prism 10231, the illumination light beam can be reflected by the curved reflecting surface 10232b of the first prism 10231, and the illumination light beam is ensured to pass through the second prism 10232 and then be reflected by the digital micromirror device 1024 arranged outside the digital micromirror arrangement surface 10232a of the second prism 10232.

In the embodiment of the present application, the curved reflective surface 10232b of the first prism 10231 is a spherical reflective surface or an aspherical reflective surface. The embodiment of the present application does not limit the structure of the curved reflective surface 10232b of the first prism 10231, and it is only necessary to ensure that the curved reflective surface 10232b can effectively reflect the illumination beam incident into the first prism 10231 from the incident surface 10231a of the first prism 10231.

In the embodiment of the present application, the third prism 10233 may be a flat plate prism. In order to ensure that the illumination light beams can be totally reflected on the exit surface 10231b of the first prism 10231 and the reflective surface 10232b of the second prism 10232, gaps are required between the exit surface 10232c of the first prism 10231 and the third prism 10233, and between the reflective surface 10232b of the second prism 10232 and the third prism 10233. At this time, when the light emitting surface 10232c of the first prism 10231 is totally reflected, the illumination light flux enters a gap between the light emitting surface 10232c of the first prism 10231 and the third prism 10233 from the first prism 10231. When the second prism 10232 totally reflects, the illumination light flux is incident from the second prism 10232 to a gap between the reflection surface 10232b of the third prism 10233 and the second prism 10232. The medium at the gap may be air.

In the present embodiment, the illumination light beam incident from the first prism 10231 to the third prism 10233 may be refracted, and the illumination light beam incident from the third prism 10233 to the second prism 10232 may be refracted. The thickness of the third prism 10233 may be related to the angle of the illumination light beam incident from the first prism 10231 to the third prism 10233, ensuring that the illumination light beam can be incident on the light receiving surface 1024a of the dmd 1024. Also, since the digital micromirror device 1024 is generally disposed on a circuit board, by disposing the third prism 10233 between the emission surface 10231b of the first prism 10231 and the reflective surface 10232b of the second prism 10232, the distance between the first prism 10231 and the circuit board can be increased, and the first prism 10231 and the circuit board are prevented from interfering with each other.

In order to allow a gap between the exit surface 10231b of the first prism 10231 and the third prism 10233, and between the light-reflecting surface 10232b of the second prism 10232 and the third prism 10233, the first prism 10231 and the third prism 10233, and the second prism 10232 and the third prism 10233 can be fixedly connected by dispensing. Since the glue is melted easily at a high temperature, the illumination light beam is difficult to enter the lens 103 after passing through the prism assembly 1023.

Therefore, in order to reduce the effect of melting the dispensing dots, referring to fig. 9, the optical engine 102 may include: at least one prism holder 1025. Fig. 10 is a top view of a prism assembly provided in embodiments of the present application. Referring to fig. 10, the second prism 10232 may have at least one fixing portion 10232d extending therefrom, and the at least one prism fixing member 1025 may be fixedly connected to the housing 1021, and may press the at least one fixing portion 10232d of the second prism 10232 against the housing 1021 in a one-to-one correspondence manner.

In the embodiment of the present application, only at least one prism fixing member 1025 is used to fix the second prism 10232 on the housing 1021, and neither the third prism 10233 nor the first prism 10231 is fixed with the housing 1021, so that the third prism 10233 and the first prism 10231 can change their positions along with melting of the glue at a higher temperature, and the illumination light beam can be ensured to enter the lens 103 after passing through the prism assembly 1023.

Referring to fig. 10, it can be seen that the length of the orthographic projection of the second prism 10232 on the digital micro-mirror device 1024 along the first direction X may be greater than the length of the orthographic projection of the first prism 10231 on the digital micro-mirror device 1024 along the first direction X. In addition, both ends of the second prism 10232 in the first direction X extend beyond the first prism 10231, and two prism holders 1025 can be respectively pressed on both ends of the second prism 10232. The portion of the second prism 10232 beyond the first prism 10231 can form a fixing portion 10232 d. The first direction X may be parallel to the light receiving surface 1024a of the dmd 1024 and perpendicular to the illumination light beam emitted from the second prism 10232.

Fig. 11 is a schematic structural diagram of a prism fixing member according to an embodiment of the present disclosure. Referring to fig. 11, the prism holder 1025 may include: a bracket 10251 and a spring plate 10252 connected to the bracket 10251. The bracket 10251 may be connected to the housing 1021, and the elastic piece 10252 may abut against the fixing portion 10232d of the second prism 10232. The third prism 10233 is fixed on the shell 1021 by the support 10251 and the spring piece 10252, so that the reliability of fixing the second prism 10232 and the shell 1021 can be ensured. Two resilient tabs 10252 are shown in fig. 10.

In the embodiment of the present application, the second prism 10232 may be a triangular prism. That is, the second prism 10232 may have a triangular cross section. Two fixing portions 10232d are shown in fig. 10, and accordingly, referring to fig. 9, the laser projection apparatus may include a first prism holder 1025a and a second prism holder 1025 b.

The prism holder 1025 shown in fig. 10 may be a first prism holder 1025a, the bracket 10251 of the first prism holder 1025a may include a baffle 10251a1, and the spring 10252 of the first prism holder 1025a may abut against the designated side of the second prism 10232. The designated side may refer to a side of the second prism 10232 far from the digital micromirror device 1024, that is, the designated side may be a light-reflecting surface 10232b of the second prism 10232.

Fig. 12 is a schematic structural diagram of another prism holder according to an embodiment of the present disclosure. The prism fixing member 1025 shown in fig. 12 may be a second prism fixing member 1025b, and referring to fig. 12, the elastic sheet 10252 of the second prism fixing member 1025b may include a first elastic sheet 10252a and a second elastic sheet 10252 b. The first elastic piece 10252a can abut against one bottom surface of the second prism 10232, the first elastic piece 10252a can press the other bottom surface of the second prism 10232 against the baffle 10251a1 of the first prism fixing piece 1025a, and the second elastic piece 10252b can abut against the designated side surface of the second prism 10232. In fig. 12, two first elastic sheets 10252a and two second elastic sheets 10252b are shown. One and the other bottom surfaces of the second prism 10232 may be triangular in shape.

The relative position of the second prism 10232 and the shell 1021 can be fixed by adopting the first prism fixing piece 1025a and the second prism fixing piece 1025b, so that the second prism 10232 is ensured not to shake relative to the shell 1021, and the illuminating light beam can shoot to the lens 103 after passing through the prism assembly 1023.

Referring to fig. 11 and 12, the second prism fixing member 1025b may have one more spring piece 10252a for abutting against the bottom surface of the second prism 10232 with respect to the first prism fixing member 1025 a. Of course, the second prism fixing member 1025b may not be provided with the first elastic sheet 10252 a. That is, the shapes of the first prism holder 1025a and the second prism holder 1025b may be the same or different, which is not limited in the embodiments of the present application.

Alternatively, the first and

second prism holders

1025a and 1025b may be made of a stainless steel material. Alternatively, the first prism holder 1025a and the second prism holder 1025b may be made of other materials, which is not limited in the embodiments of the present invention.

Referring to fig. 7 and 8, an optical axis (a light path of the illumination light beam) of the laser projection apparatus may pass through the light incident surface 10231a of the first prism 10231 and the light emitting surface 10232c of the second prism 10232, and the digital micromirror device 1024 may be positioned at one side of the optical axis. The light adjusting component 1022, the prism component 1023 and the lens 103 in the laser projection equipment can be arranged in a linear manner, so that the layout of the laser projection equipment is more compact, and the space occupied by the laser projection equipment is reduced.

As can be seen with reference to fig. 6, the light adjustment assembly 1022 may include: a light pipe 10221 and a light-collecting lens 10222. The light pipe 10221 may include a light inlet 10221a and a light outlet 10221b, and the light pipe 10221 may be fixedly coupled to the housing 1021. The light receiving lens 10222 may be located at the light outlet 10221b of the light guide 10221, and the light receiving lens 10222 may be fixedly connected to the housing 1021. That is, the light-receiving lens 10222 can be located between the light pipe 10221 and the prism assembly 1023.

The light pipe 10221 and the light collection lens 10222 may both be used to shape the illumination beam. Also, the light pipe 10221 can integrate the circular light spot emitted by the light adjustment assembly 1022 into a rectangular light spot that can be used to match the dmd 1024. Wherein, the rectangular light spot matching the dmd 1024 may mean that the rectangular light spot may completely cover the dmd 1024. Alternatively, the product of the diagonal size of the light outlet 10221b of the light pipe 10221 and the magnification of the light receiving lens 10222 is equal to the diagonal size of the dmd 1024.

Fig. 13 is a partial schematic structural diagram of another laser projection apparatus provided in an embodiment of the present application. As can be seen in fig. 13, the optical engine 102 may further include a contoured cover 1026 corresponding to the light collecting lens 10222. Accordingly, the housing 1021 may have a contoured mirror groove corresponding to the light collecting lens 10222, the light collecting lens 10222 may be located in the contoured mirror groove, and the contoured cover 1026 may be snapped onto the contoured mirror groove to fix the light collecting lens 10222 in the contoured mirror groove.

By disposing the light-receiving lens 10222 in the profile mirror groove and fixing the light-receiving lens 10222 in the profile mirror groove by using the profile cover 1026, the light-receiving lens 10222 can be prevented from shaking relative to the housing 1021, and the light-receiving lens 10222 can be stably fixed on the housing 1021.

A flexible layer may be disposed on a side of the profiling cover plate 1026 close to the light-receiving lens 10222, and the flexible layer may prevent the light-receiving lens 10222 from being damaged. Of course, a flexible layer may be disposed on a side of the profiling mirror groove close to the light receiving lens 10222, so as to further prevent the light receiving lens 10222 from being damaged. Alternatively, the flexible layer may be rubber.

As can be seen with reference to fig. 6, the light-collecting lens 10222 may include: a first lens 102221 and a second lens 102222. The first lens 102221 may be proximate to the light pipe 10221 relative to the second lens 102222.

The first lens 102221 may be configured to diverge the illumination beam shaped by the light pipe 10221, and the second lens 102222 may be configured to converge the illumination beam diverged by the first lens 102221.

The first lens 102221 is protruded from a surface of the first lens 102221 facing away from the light pipe 10221, the surface of the first lens 102221 facing away from the light pipe 10221 is protruded from a surface of the first lens 102221 facing away from the light pipe 10221. The side of the second lens 102222 adjacent to the light pipe 10221 is convex toward the side adjacent to the light pipe 10221, and the side of the second lens 102222 remote from the light pipe 10221 is convex toward the side remote from the light pipe 10221.

Alternatively, the first lens 102221 and the second lens 102222 may be spherical lenses or aspheric lenses. For example, the first lens 102221 may be a positive lens, and the second lens 102222 may be a positive aspheric lens.

In the embodiment of the present application, the illumination light beam received by the second lens 102222 can be parallel to the extending direction of the light guide 10221, i.e. the illumination light beam is emitted perpendicularly from the second lens 102222, so as to ensure that the illumination light beam can be reflected by the emitting surface 10231b of the first prism 10231 after entering the first prism 10231 from the light incident surface 10231a of the first prism 10231. Of course, the illumination light beam received by the second lens 102222 may have a certain angle with the extending direction of the light guide 10221, so long as the illumination light beam is reflected by the exit surface 10231b of the first prism 10231.

As can be seen with reference to fig. 6, the optical adjustment assembly 1022 may further include: a mirror 10223, the mirror 10223 being fixedly connected to the housing 1021. The mirror 10223 can be positioned between the light receiving lens 10222 and the prism assembly 1023, and the mirror 10223 can be used to adjust the optical path of the illumination beam emitted by the light adjustment assembly 1022 toward the prism assembly 1023.

Optionally, an angle between the illumination beam incident on the mirror 10223 and the illumination beam reflected by the mirror 10223 may be greater than or equal to a second angle threshold. The second angle threshold may be equal to 80, that is, the angle between the illumination beam incident to the mirror 10223 and the illumination beam reflected by the mirror 10223 may be greater than or equal to 80 degrees.

For example, the illumination beam incident on the mirror 10223 may be perpendicular to the illumination beam reflected by the mirror 10223.

In the embodiment of the present application, referring to fig. 8 and 14, the optical path of the laser projection apparatus is: the illumination light beam provided by the light source 101 is shaped by the light guide 10221 and then is diverged by the first lens 102221, and the illumination light beam is diverged by the first lens 102221 and then is converged by the second lens 102222. Then, the illumination light beam received by the second lens 102222 may be reflected by the mirror 10223 and incident into the first prism 10231 from the light incident surface 10231a of the first prism 10231, the illumination light beam may be reflected by the light emitting surface 10231b of the first prism 10231 and then emitted to the curved reflecting surface 10232b of the first prism 10231, the illumination light beam may be reflected by the curved reflecting surface 10232b of the first prism 10231 and then emitted from the light emitting surface 10231b of the first prism 10231, the illumination light beam may pass through the third prism 10233 and then incident into the third prism 10233 from the light reflecting surface 10232b of the second prism 10232 and then emitted from the light receiving surface 1024a of the digital micro-mirror device 1024a of the second prism 10232, the light receiving surface 1024a of the digital micro-mirror 10232 may reflect the illumination light beam to the digital micro-mirror 10232a and enter the second prism 10232c, the light reflecting surface 10232b of the second prism 10232 reflects the illumination light beam and then emitted from the light emitting surface 10232c of the second prism 10232, and toward the lens 103.

It should be noted that the illumination light beams provided by the light source 101 may be multiple illumination light beams, the multiple illumination light beams may be parallel to each other, or at least two illumination light beams of the multiple illumination light beams may have a certain included angle therebetween. The illumination light beams in the plurality of illumination light beams that can be reflected by the exit surface 10231b of the first prism 10231 can finally be directed to the lens 103. By way of example, the optical paths of two illumination beams are shown in fig. 7 and 8.

Fig. 15 is a schematic structural diagram of an optical engine in a laser projection apparatus according to an embodiment of the present application. Referring to fig. 15, the optical engine 102 includes a housing 1021, a plurality of optical lenses (not shown in fig. 15) are disposed in the housing 1021, and a digital micromirror device 1024 is mounted on the housing 1021.

The front surface of the digital micromirror device 1024 is a light receiving surface 1024a facing the inside of the housing 1021, the back surface of the digital micromirror device 1024 is connected and fixed with the circuit board 1027, a fixing plate 1028 is stacked on the circuit board 1027 and fixed with the circuit board 1027 and the housing 1021 by a first set of screws a1, the fixing plate 1028 and the circuit board 1027 are both provided with openings, the fixing plate 1028 is provided with an opening a, the circuit board 1027 is provided with an opening b, and the digital micromirror device 1024 is exposed at the openings a and b.

A cooling module 1029 is further disposed above the fixing plate 1028, the cooling module 1029 and the housing 1021 are fixed by a second set of screws a2, the cooling module 1029 includes a cooling terminal 10291, and the cooling terminal 10291 is in heat conduction with the back side of the dmd 1024 through an opening a of the fixing plate 1028 and an opening b of the circuit board 1027.

Fig. 16 is a schematic overall structural diagram of a laser projection apparatus according to an embodiment of the present application. The laser projection device may include a light source 101, an optical engine 102, and a lens 103. The optical engine 102 may be configured as shown in fig. 15.

Fig. 17 is a schematic diagram of a separated structure of an optical engine in the laser projection apparatus shown in fig. 16. The fixing plate 1028 fixes the dmd 1024 to the circuit board 1027 and the housing 1021 by at least four first screws a11, a heat dissipation area of the dmd 1024 is exposed in openings of the fixing plate 1028 and the circuit board 1027, the cooling module 1029 is fixed to the housing 1021 by at least four second screws a21, and the cooling module includes a cooling terminal, which passes through the fixing plate 1028 and the openings of the circuit board 1027 to contact the heat dissipation area of the dmd 1024.

Alternatively, as shown in fig. 18, it is a top view of the back surface of the dmd 1024 in the optical engine shown in fig. 15. The back surface of the dmd 1024 has a bearing area 1024b and a heat dissipation area 1024c, the circuit board 1027 abuts against the bearing area 1024b to press the dmd 1024 against the housing 1021, and the cooling terminal 122 contacts with the heat dissipation area 1024 c.

Alternatively, as shown in fig. 19, it is a schematic structural diagram of the first screw and its connecting component in the optical machine shown in fig. 17. The first set of screws a1 includes at least four first screws a11, the fixing plate 1028 has at least four first through holes 1028a, and the at least four first screws a11 pass through the at least four first through holes 1028a in a one-to-one correspondence manner and are threadedly connected to the housing 1021.

Wherein each first screw a11 may be a shoulder screw. The fixing plate 1028 presses the dmd 1024 against the housing 1021 by the first screw a 11. The circuit board 1027 may have at least four through holes, and the at least four first screws a11 may pass through the four first through holes one by one, then pass through the at least four through holes of the circuit board 1027, and be connected with the housing 1021 by screw.

Each first screw a11 includes a screw a111, a screw head a112 at one end of the screw a111, and a spring a113 sleeved on the screw a111, where one end of the spring a113 abuts against the screw head a112 and the other end abuts against the fixing plate 1028.

One end of the spring a113 abuts against the screw head a112, and the other end abuts against the fixing plate 1028, so that the magnitude of the force applied to the digital micromirror device 1024 by the spring a113 can be accurately determined according to the relationship between the deformation of the spring a113 and the force applied thereto when the first screw a11 is rotated.

Fig. 20 is a top view of the fixation plate of fig. 19. The first through holes 1028a may be located at four corners of the fixing plate 1028.

The laser projection equipment provided by the embodiment of the application can fix the fixing plate 1028 and the digital micromirror device 1024 on the shell 1021 through at least four first screws a11 and at least four first through holes 1028a on the fixing plate 1028 when in use, and can avoid the displacement of the digital micromirror caused by the shaking of the cooling assembly.

Fig. 21 is a top view of the optical engine of the laser projection apparatus shown in fig. 15. Wherein an orthographic projection of the cooling module 1029 on the housing 1021 does not overlap with an orthographic projection of at least four first screws a11 on the housing 1021. With such a structure, the cooling module 1029 can be prevented from shielding at least four first screws a11, and adverse effects such as damage to the cooling module 1029 caused by at least four first screws a11 can also be avoided.

Fig. 22 is a left side view of the optical engine of the laser projection apparatus shown in fig. 21. The second set of screws a2 includes at least four second screws a21, the cooling module 1029 has at least four second through holes, and the four second screws a21 correspondingly pass through the at least four second through holes 1029a and are screwed with the housing 1021.

The cooling module 1029 is fixed to the housing 1021 by a second screw a21, and a fixing plate 1028, a circuit board 1027 and a digital micromirror device 1024 are disposed between the cooling module 1029 and the housing 1021. The cooling terminals 122 of the cooling assembly 1029 pass through the fixing plate 1028 and the circuit board 1027 to contact the dmd 1024.

Each second screw a21 includes a screw a211, a head a212 at one end of the screw a211, and a spring a213 sleeved on the screw a211, wherein one end of the spring a213 abuts against the head a212, and the other end abuts against the cooling assembly 1029.

One end of the spring a213 abuts against the screw head a212, and the other end abuts against the cooling module 1029, so that when the second screw a21 is rotated, the magnitude of the force applied to the digital micromirror device 1024 by the spring a213 through the cooling terminal 122 can be accurately determined according to the relationship between the deformation of the spring a213 and the force applied thereto.

Fig. 23 is a top view of the cooling module of the light engine of fig. 22. Wherein the second through holes 1029a may be located at corners of the cooling module 1029.

In the embodiment of the present application, each second screw may be the same screw as the first screw, or may be a different screw from the first screw, and the embodiment of the present application 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. 24 is a schematic diagram showing positions of at least four second screws and the dmd fixing plate in the optical machine shown in fig. 16. The orthographic projection of the at least four second screws a21 on the shell 1021 and the orthographic projection of the fixing plate 1028 on the shell 1021 do not overlap.

This structure allows the cooling module 1029 and the dmd 1024 fixed by the at least four second screws a21 to be fixed on the housing 1021 separately, thereby avoiding the negative effect caused by integrally fixing the cooling module 1029 and the dmd 1024.

Fig. 25 is an exploded view of the optical engine of the laser projection apparatus shown in fig. 16. Wherein the sum of the pressure applied by the fixing plate 1028 to the bearing region 1024b and the pressure applied by the cooling terminal (not shown) to the heat dissipation region 1024c is smaller than the designed bearing pressure of the dmd 1024.

The pressure applied by the fixing plate 1028 to the bearing region 1024b and the pressure applied by the cooling terminal (not shown in the figure) to the heat dissipation region 1024c can be precisely controlled by the springs a113 and a213 according to the relationship between the force applied by the springs and the characteristics thereof, and the sum of the two pressures is smaller than the design bearing pressure of the digital micromirror device 1024, so as to avoid the damage to the digital micromirror device 1024 caused by the sum of the two pressures being larger than the design bearing pressure of the digital micromirror device 1024.

Alternatively, the fixing plate 1028 applies a pressure to the bearing region 1024b that is greater than twice a pressure applied by the cooling terminal (not shown) to the heat dissipation region 1024 c.

The pressure applied by the fixing plate 1028 to the bearing region 1024b is much greater than the pressure applied by the cooling terminal (not shown) to the heat dissipation region 1024c, so as to protect the dmd 1024, and meanwhile, when the cooling terminal (not shown) contacting the heat dissipation region 1024c is driven by the cooling module 1029, the cooling terminal (not shown) drives the dmd 1024, so that the dmd 1024 can be fixed more firmly.

Fig. 26 is an assembly structure diagram of the optical-mechanical device shown in fig. 17. The fixing plate 1028 and the cooling module 1029 are fixed to the housing 1021.

Taking the laser projection apparatus shown in fig. 17 as an example, the step of mounting the digital micromirror device in any one of the laser projection apparatuses provided in this application may include:

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

when the fixing plate 1028 is fixed to the housing 1021 of the laser projection apparatus, the heat dissipation region 1024c of the dmd 1024 is exposed at the opening a of the fixing plate 1028 and the opening b of the circuit board 1027, so that the cooling terminal of the cooling assembly 1029 is subsequently brought into contact with the heat dissipation region 1024c of the dmd 1024 through the two openings to perform heat dissipation processing on the dmd 1024. The fixing plate 1028, the dmd 1024 and the circuit board are fixed on the casing 1021 by at least four first screws a11 and at least four first through holes 1028a on the fixing plate 1028, and the circuit board 1027 abuts against the bearing area 151 to press the dmd 1024 on the casing 1021, during which the magnitude of the force applied to the bearing area 1024b of the dmd 1024 can be accurately controlled by the spring a 113.

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

the cooling module 1029 is placed above the fixing plate 1028, so that the orthographic projection of the cooling module 1029 on the housing 1021 is not overlapped with the orthographic projection of at least four first screws a11 on the housing 1021, and the orthographic projection of at least four second screws a21 on the housing 1021 is not overlapped with the orthographic projection of the fixing plate 1028 on the housing 1021, while the cooling terminal of the cooling module 1029 is in contact with the heat dissipation region 1024c of the digital micromirror device 1024 through the opening a of the fixing plate 1028 and the opening b of the circuit board 1027, and the cooling module 1029 is fixed on the housing 1021 through at least four second screws a21 and at least four second through holes 1029a of the cooling module 1029, during which the magnitude of the force applied to the heat dissipation region 1024c of the digital micromirror device 1024 can be accurately controlled by the spring 143.

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

In an embodiment of the present invention, the laser projection apparatus may further include a light pipe fixing device. Fig. 27 is a schematic structural diagram of a light pipe fixing device according to an embodiment of the present application. The light pipe fixture 104 may include: a fixing assembly 1041, at least one adjusting screw 1042, and a tubular light pipe bearing assembly 1043, wherein the light pipe bearing assembly 1043 is internally provided with a light pipe 10221.

The fixing assembly 1041 is fixedly connected to the housing 1021, and fixes the light pipe supporting assembly 1043 inside the housing 1021.

The housing 1021 has at least one threaded through hole 1021b, at least one adjusting screw 1042 is correspondingly assembled in the at least one threaded through hole 1021b from the outside of the housing 1021, and an end of each adjusting screw 1042 abuts against an outer wall of the light guide bearing assembly 1043.

Referring to fig. 28, which shows a schematic structural diagram of another light pipe fixing device according to an embodiment of the present disclosure, a housing 1021 has an L-shaped retaining wall 10211, a fixing assembly 1041 includes at least two elastic pieces 10411, the at least two elastic pieces 10411 respectively abut against two adjacent outer walls of a light pipe supporting assembly 1043, and the other two adjacent outer walls of the light pipe supporting assembly 1043 abut against the L-shaped retaining wall 10211 under the action of the at least two elastic pieces 10411. An L-shaped wall 10211 is disposed inside the housing 1021 to define the position of two adjacent outer walls of the light guide carrying assembly 1043. Since the L-shaped retaining wall 10211 has a larger area, at this time, the light pipe bearing assembly 1043 is pressed on the other two surfaces by the spring pieces 10411 occupying a smaller space, and the light pipe bearing assembly 1043 is pressed against the L-shaped retaining wall 10211 to fix the light pipe bearing assembly 1043.

Optionally, the light pipe bearing assembly 1043 is rectangular, the number of the adjusting screws 1042 is two, and the two adjusting screws 1042 abut against two adjacent outer walls of the light pipe bearing assembly 1043 respectively. The light pipe supporting assembly 1043 has the same shape as the light pipe 10221 and can be more closely attached to the light pipe 10221, so that the light pipe 10221 is more stably disposed in the light pipe supporting assembly 1043. The light pipe 10221 is a tubular glass product, which is fragile, and if the adjusting screw 1042 is directly pressed against two adjacent outer walls of the light pipe 10221, the light pipe 10221 is easily broken during the adjustment process. The light pipe 10221 is disposed in the light pipe supporting assembly 1043, the tubular light pipe supporting assembly 1043 is attached to the light pipe 10221, the adjusting screw 1042 abuts against two adjacent outer walls of the light pipe supporting assembly, and the light pipe 10221 is also pushed when the light pipe supporting assembly 1043 is pushed in the adjusting process. The light pipe bearing assembly 1043 may be a sheet metal part, and the sheet metal part is formed by performing a comprehensive cold working process on a metal sheet, and the thickness of the formed same part is consistent. The light pipe carrying component sheet metal part is made of metal iron, and the light pipe carrying component can be made of other materials. The adjusting screw 1042 is pressed against two adjacent outer walls of the iron light guide bearing assembly, so that the light guide 10221 can be finely adjusted, and the light guide 10221 can be protected from being damaged in the adjusting process.

Fig. 29 is a schematic view of the structure of the exterior of the housing in the laser projection apparatus. The housing 1021 has two through holes, two adjusting screws 1042 pass through the two through holes from the outside of the housing 1021, and the end of each adjusting screw 1042 abuts against the outer wall of the light pipe carrying assembly. The adjusting end of the adjusting screw 1042 is located outside the casing 1021, when the position of the light guide tube 10221 is adjusted subsequently, the adjusting screw 1042 can be operated directly from outside the casing 1021, and when the adjusting screw 1042 is glued and fixed after adjustment is completed, the adjusting end of the adjusting screw 1042 is glued and fixed and sealed directly from outside the casing 1021, and when the glue is volatilized at high temperature, the parts inside the casing 1021 are not affected, so that the service life of the laser projection device is prolonged.

Fig. 30 is a schematic structural diagram of a light pipe carrying assembly in a light pipe fixing device according to an embodiment of the present disclosure. Optionally, a protruding structure 10431 is disposed on an outer wall of the light pipe bearing assembly 1043, and one elastic piece 10411 of the at least two elastic pieces 10411 abuts against the protruding structure 10431. If the elastic piece 10411 directly contacts the light pipe supporting assembly 1043, the elastic piece 10411 may slide on the outer wall of the light pipe supporting assembly 1043 during the adjustment of the fixing assembly 1041, so that the light pipe supporting assembly 1043 may be deviated. The protrusion 10431 is disposed on a surface of the light guide tube assembly 1043, and the protrusion 10431 cooperates with the elastic sheet 10252 of the fixing assembly 1041 to fix the light guide tube assembly 1043 more stably.

Optionally, at least one pair of the 4 sides of the opening at one end of the light guide bearing assembly 1043 has a wall 10432, and the height of the wall 10432 is smaller than the thickness of the inner wall of the light guide 10221. The light guide 10221 is pushed into the other end of the light guide bearing assembly 1043 from one end of the light guide bearing assembly 1043 until the other end contacts the retaining wall 10432, and the retaining wall 10432 can limit the light guide 10221. Because the light guide 10221 is made of transparent glass, the light source 101 passes through the light guide 10221 and also reflects light on the four walls of the light guide 10221, the light reflected by the four walls is messy and affects the effect of the light guide 10221, the retaining wall 10432 can block the reflected light, the height of the retaining wall is less than the thickness of the inner wall of the light guide 10221, and the light source 101 can be blocked without affecting the path of the light source 101 passing through the tubular light guide 10221.

Optionally, the light pipe carrier 1043 has at least one through hole 1043a on an outer wall thereof, and the through hole 1043a has an adhesive thereon to adhere the light pipe carrier 1043 to the light pipe 10221. In fig. 30a, the light guide bearing assembly 1043 has claws 10433 on two adjacent outer walls of four outer walls, and the claws 10433 are folded into the light guide bearing assembly 1043 for pressing the light guide 10221 toward the opposite inner wall so as to make the light guide 10221 closer to the other two inner walls without claws 10433. In fig. 30b, at least one through hole 1043a may be formed in two adjacent outer walls where the claws 10433 are not formed, and the shape of the through hole may be rectangular or other shapes. After the light pipe 10221 enters the light pipe supporting assembly 1043, a gap is formed between the light pipe 10221 and the inner wall of the light pipe supporting assembly 1043, and an adhesive is injected from the through hole 1043a, so that the light pipe 10221 can be more firmly fixed inside the light pipe supporting assembly 1043. The adhesive may be a shadowless adhesive or other adhesives, and the embodiments of the present application are not limited herein.

Optionally, the number of through holes 1043a on the outer wall of the light pipe carrier assembly 1043 is 4. The through holes 1043a on the outer wall of the light pipe supporting assembly 1043 may be distributed two by two on two adjacent outer walls, and the adhesive is injected from each through hole 1043a, so that the adhesive can bond the light pipe 10221 and the light pipe supporting assembly 1043 more uniformly. Through holes may also be disposed on four outer walls of the light pipe bearing assembly 1043, which is not limited in this embodiment.

Optionally, the housing 1021 has an L-shaped positioning structure 10212, two adjacent outer walls at one end of the light pipe carrying assembly have an opening, and two adjacent outer walls of the light pipe 10221 are exposed at the opening and abut against the L-shaped positioning structure. As shown in fig. 28, the L-shaped positioning structure 10212 may be arranged in advance in the housing 1021 by theoretical design, so as to more stably fix the position of the light source 101 entrance end of the light guide 10221, the light source 101 entrance end of the light guide 10221 is directly disposed on the L-shaped positioning structure 10212, and the portion contacting with the L-shaped positioning structure 10212 does not cover the light guide carrying assembly, which is more favorable for the light source 101 to be collected by the light guide 10221.

Fig. 31 is a schematic structural diagram of a fixing assembly in the light pipe fixing device according to the embodiment of the present application. Referring to fig. 31, the fixing assembly 1041 includes an L-shaped baffle 10412 formed by connecting two baffles with a specified included angle and a connecting plate 10413, and at least two elastic pieces 10411 are respectively connected with the two baffles 10412; the connection plates 10413 are respectively connected to the two flaps 10412, and each connection plate has a threaded hole 10413a, and the connection plate 10413 is screwed to the housing 1021 through the threaded hole 10413 a. The two adjacent surfaces of the L-shaped baffle 10412 and the light pipe carrying assembly are two surfaces of the light pipe carrying assembly which is not adjacent to the L-shaped retaining wall, and the light pipe carrying assembly is fixed on all four surfaces under the combined action of the L-shaped baffle 10412 and the L-shaped retaining wall. Connecting plate 10413 that extends from L shape baffle 10412, can fix with casing 1021, there are a plurality of screw hole 10413a on the connecting plate 10413, because casing 1021 inner space is less, fixed subassembly size is also less, a plurality of screw holes are difficult to set up, the fixed ability of a screw hole is relatively weak, consequently, the quantity of screw hole on each connecting plate 10413 can be two, can be through this screw hole 10413a and casing 1021 threaded connection, do not influence the fixed of L shape baffle 10412 light pipe carrier assembly promptly, can also use simple and convenient firm threaded connection to fix fixed subassembly, thereby fixed light pipe carrier assembly. At least two elastic pieces 10411 are symmetrically disposed on two sides of the two baffles 10412, and when two elastic pieces 10252 are disposed on each side, the fixing assembly has four elastic pieces 10411. Two spring plates 10252 are disposed on one side to adjust the position of the light guide assembly on two sides not adjacent to the L-shaped retaining wall. Other numbers of spring pieces 10411 and threaded holes may also be provided, and the embodiment of the present application is not limited herein. The fixed component 1041 may be a sheet metal part, and may also be processed by using other processing methods, which is not limited herein in the embodiment of the present application.

As shown in fig. 28, optionally, the housing 1021 has a positioning protrusion 10213, the connecting plate has a positioning hole, and the positioning protrusion 10213 is located in the positioning hole of the connecting plate. Positioning protrusions 10213 are arranged at fixed positions in the housing 1021 in advance, and positioning holes for the positioning protrusions 10213 to pass through are arranged on the connecting plate on the fixing assembly, and as shown in fig. 31, the positioning hole 10413b is arranged at the middle position of the plurality of threaded holes 10413a on the connecting plate 10413. When the fixing component is installed, the position of the fixing component can be determined according to the positioning protrusion 10213, so that light transmission errors of different laser projection devices caused by position errors of the fixing component can be avoided. The fixing assembly 1041 and the positioning protrusion 10213 cooperate to fix the light pipe carrying assembly and the light pipe 10221 in a theoretical position in the housing 1021.

Fig. 32 is a schematic partial structural diagram of another laser projection apparatus provided in an embodiment of the present application. As can be seen with reference to fig. 32, the laser projection apparatus may further include: the galvanometer 105 and the galvanometer bracket 106, the galvanometer 105 is arranged in a light path between the digital micro-mirror device 1024 and the lens 103 and is used for being driven by electricity to periodically move at four positions, and modulated light beams passing through the galvanometer 105 enter the lens 103 in a staggered mode in sequence. The galvanometer 105 is fixed to the housing 1021 by a galvanometer bracket 106.

The galvanometer 105 and the galvanometer bracket 106 are in non-rigid connection, and/or the galvanometer bracket 106 and the shell 1021 are in non-rigid connection.

Fig. 33 is a schematic perspective view of the galvanometer and the galvanometer holder in fig. 32. The galvanometer 105 is connected to a galvanometer bracket 106.

Referring to fig. 34, which shows a schematic diagram of a partial explosion structure of a laser projection apparatus provided in an embodiment of the present application, referring to fig. 34, a galvanometer 105 may include a mounting plate 1051, and a mirror 1052 and a mirror driving structure 1053 mounted on the mounting plate 1051. The galvanometer 105 includes at least four first screws 1054 and at least four first flexible pads 1055, and the at least four first screws 1054 respectively penetrate the at least four first flexible pads 1055 and the mounting plate 1051 and are screwed with the galvanometer bracket 106. After the laser projection device is powered on, the lens driving structure 1053 converts the electric signal into vibration, so as to drive the lens 1052 to swing along the axis at high frequency, and project a pixel point in the image reflected by the digital micro-mirror device 1024 to two positions, thereby improving the resolution. The lens driving structure 1053 is assembled on the mounting plate 1051, and drives the mounting plate 1051 to vibrate. In the related art, the galvanometer transmits vibration to the galvanometer bracket through a screw. In the embodiment of the present application, the first screw 1054 in the galvanometer 105 connects the mounting plate 1051 with the galvanometer bracket 106, and the first flexible pad 1055 separates the first screw 1054 from the galvanometer bracket 106, so as to weaken the transmission of vibration by the first screw 1054, that is, the galvanometer 105 can weaken the vibration frequency transmitted from the galvanometer to the galvanometer bracket 106, thereby reducing the noise generated by a part of vibration. Wherein the first screw 1054 can be a shoulder screw.

Optionally, the first flexible pad 1055 includes a tubular structure and two ring structures extending from two ends of the tubular structure, respectively. The mounting plate 1051 is provided with at least four first through holes 1051a, the tubular structures of the at least four first flexible cushions 1055 are correspondingly positioned in the at least four first through holes 1051a, and the two annular structures are respectively positioned at two sides of the mounting plate 1051. Fig. 35 is a schematic diagram of the first flexible mat 1055 of fig. 34, including a tubular structure 10551 and two

loop structures

10552 and 10553 extending from opposite ends of the tubular structure 10551.

Optionally, the first screw 1054 includes a first shaft 10541 and a head 10542 at one end of the first shaft, the first shaft being located in the tubular structure with a gap between the head and the annular structure. Figure 36 is a cross-sectional view of the galvanometer of figure 34 with a first screw 10541 of a first screw 1054 passing through the tubular structure of the first flexible pad 1055 and a head 10542 of the first screw 1054 having a gap, i.e., a non-rigid connection, with the annular structure 10552. The mounting plate 1051 is not in direct contact with the first screw 1054. The first flexible pad may also have other shapes, and the embodiments of the present application are not limited herein. The first flexible pad 1055 blocks most of the vibration transmission, but the first flexible pad 1055 cannot completely block the vibration transmission, the vibration of the galvanometer is transmitted to the first screw 1054, the first screw 1054 transmits the vibration to the first flexible pad 1055, and the first flexible pad 1055 transmits the vibration to the galvanometer bracket 106. And because the first flexible cushion 1055 has low manufacturing tolerance, the compression amount of each machine may have slight difference, and the noise level of the whole machine is poor in consistency. A gap may be provided between the galvanometer 105 and the galvanometer holder 106, which gap completely blocks the transmission of vibrations. The clearance between the spiral head 10542 of first screw 1054 and the loop configuration 1252 can be 0.1mm (millimeter), 0.1 mm's clearance both can make and shake mirror 105 and shake and leave certain space between the mirror support 106, also can not lead to connecting firmly inadequately because the space is too big, and the optical index of the mirror slope 1 degree that shakes can be guaranteed to 0.1 mm's clearance, will shake secondary vibrations that the mirror vibrations induced under the prerequisite that does not influence the picture quality and thoroughly eliminate, and then improve complete machine noise level. The gap may also be set to other widths, and the embodiments of the present application are not limited herein.

Optionally, the material of the first flexible pad 1055 comprises rubber. Rubber is a high-elasticity polymer material, and the viscoelasticity of the rubber enables the rubber to have good damping performance. The vibration generated by the mounting plate 1051 is attenuated by the first flexible pad 1055 made of rubber, so that the vibration transmitted to the galvanometer bracket 106 is reduced. Thereby playing the effect of shock attenuation and noise reduction. The material of the first flexible pad 1055 may also be other materials with good shock absorption effect, and the embodiment of the present application is not limited herein.

Optionally, the galvanometer 105 includes at least four second screws 1056 and at least four second flexible pads 1057, and the at least four second screws 1056 respectively penetrate through the at least four second flexible pads 1057 and the galvanometer bracket 106 and are connected with the housing by screw threads. The galvanometer bracket 106 is connected to the housing 1021 through the galvanometer 105 to fix the galvanometer 105 inside the housing. In the related art, after the vibration mirror is transmitted to the vibration mirror support, the vibration mirror support transmits the vibration to the inside of the shell through the screw, the vibration frequency is gradually multiplied in the transmission process, and the whole shell generates larger noise in the vibration. In the embodiment of the present application, a first screw 1054 and a first flexible pad 1055 are used to attenuate a part of the vibration transmitted from the galvanometer 105 to the galvanometer holder 106, and a second screw 1056 and a second flexible pad 1057 which can reduce the transmission of the vibration are also provided at the connecting portion of the galvanometer holder 106 and the housing. The second flexible pad 1057 in the galvanometer 105 is in contact with the second screw 1056, which prevents the second screw from directly contacting the galvanometer bracket 106, and may hinder the transmission of vibrations. Wherein the second screw 1056 can be a shoulder screw.

Optionally, the second flexible pad 1057 comprises a tubular structure and two ring structures extending from two ends of the tubular structure, respectively. The galvanometer bracket 106 is provided with at least four second through holes 106a, the tubular structures of the at least four second flexible pads 1057 are positioned in the at least four second through holes 106a in a one-to-one correspondence, and the two annular structures are respectively positioned at two sides of the galvanometer bracket 106. Referring to fig. 35, the second flexible mat is the same as the first flexible mat 1055 of fig. 35, and includes a tubular structure through which the stud can pass and two ring structures which are clamped at both ends of the second through hole.

Optionally, the second screw includes a second screw rod and a screw head located at one end of the second screw rod, the second screw rod is located in the tubular structure, and a gap is provided between the screw head and the annular structure. When the second screw 1056 connects the mirror support 106 and the housing 1021, the second screw rod passes through the tubular structure of the second flexible pad 1057 in the second through hole 106a, and a gap is formed between the head of the second screw 1056 and the annular structure, so that the second screw 1056 does not directly contact with the mirror support 106, thereby reducing the transmission of vibration. The number of the second through holes 106a may be four, and a second flexible pad 1057 is inserted into each second through hole 106a, and is connected by a second screw 1056. When the mirror support 106 is connected to the housing, part of the vibration is transmitted from the mirror support 106 to the second screw 1056, the second screw 1056 transmits the vibration to the second flexible pad 1057, and the second flexible pad 1057 transmits the vibration to the housing, so that the mirror support 106 and the housing have a gap, which completely blocks the transmission of the vibration. The gap between the head of the second screw 1056 and the annular structure may be 0.1mm, or may be set to other widths, and the embodiment of the present application is not limited herein.

Optionally, the material of the second flexible pad 1057 comprises rubber. The second flexible pad 1057 functions to attenuate vibration transmitted from the galvanometer holder 106 to the housing, and therefore the second flexible pad 1057 may also be made of rubber having good vibration-damping properties. The material of the second flexible pad 1057 may also be other materials with good shock absorption effect, and the embodiment of the present application is not limited herein.

Carry out the first layer through first flexible pad 1055 and second flexible pad 1057 and block the transmission of vibrations, through be clearance fit between screw and flexible pad, shake and carry out the second layer for clearance fit to the transmission of vibrations between mirror support 106 and the casing and block to make the vibrations of shaking the mirror can't transmit other parts in the casing to this noise that has reduced vibrations and has produced has improved user experience.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement 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 device, characterized in that the laser projection device comprises:

a light source (101) for providing an illumination beam;

an optical machine (102) for modulating the illumination beam with an image signal;

a lens (103) for projecting the modulated illumination beam into an image;

the optical machine (102) comprises a shell (1021), wherein the shell (1021) forms an accommodating cavity (1021a), and the accommodating cavity (1021a) comprises a light adjusting component (1022), a prism component (1023) and a digital micro-mirror device (1024);

the light adjustment assembly (1022) is used for receiving and adjusting the angle or size of the illumination light beam and enabling the illumination light beam to be incident to the prism assembly (1023);

the prism assembly (1023) is arranged at the bottom of the shell (1021) and is used for receiving the illumination light beam emitted by the light adjusting assembly (1022) and reflecting the illumination light beam emitted by the light adjusting assembly (1022) twice and then entering a light receiving surface (1024a) of the digital micro-mirror device (1024);

the digital micro-mirror device (1024) is arranged on the top of the shell (1021), a light receiving surface (1024a) of the digital micro-mirror device (1024) faces the accommodating cavity (1021a), the light receiving surface (1024a) of the digital micro-mirror device (1024) reflects the illumination light beam emitted by the prism assembly (1023) and then enters the prism assembly (1023), and the prism assembly (1023) is further used for reflecting the illumination light beam reflected by the digital micro-mirror device (1024) for the third time so as to project the illumination light beam into the lens (103);

the vertical axis of the light receiving surface (1024a) of the digital micro-mirror device (1024) is perpendicular to the optical axis of the light incident surface of the lens (103).

2. A laser projection device as claimed in claim 1, wherein the prism assembly (1023) comprises: a first prism (10231) and a second prism (10232);

the illumination light beam enters the first prism (10231) from the light incident surface (10231a) of the first prism (10231), is reflected by the light emitting surface (10231b) of the first prism (10231) and the reflecting surface (10232b) of the first prism (10231) in sequence and then enters the second prism (10232), exits from the digital micro-mirror arrangement surface (10232a) of the second prism (10232) to the light receiving surface (1024a) of the digital micro-mirror device (1024), the light receiving surface (1024a) of the digital micro-mirror device (1024) reflects the illumination light beam and then enters the second prism (10232), and the light reflecting surface (2 b) of the second prism (10232) reflects the illumination light beam and then enters the lens (103) from the light emitting surface (10232c) of the second prism (10232).

3. The laser projection device of claim 2, further comprising: at least one prism holder (1025);

the second prism (10232) is provided with at least one fixing part (10232d) extending out, the at least one prism fixing part (1025) is fixedly connected with the shell (1021), and the at least one fixing part (10232d) is pressed on the shell (1021) in a one-to-one correspondence mode.

4. A laser projection device according to claim 3, wherein each prism holder (1025) comprises a bracket (10251) and a spring plate (10252) connected to the bracket (10251), the bracket (10251) is connected to the housing (1021), and the spring plate (10252) abuts on the fixing portion (10232d) of the second prism (10232).

5. A laser projection device as claimed in claim 4, wherein the second prism (10232) is a triangular prism;

the number of the at least one prism fixing piece (1025) is 2, and the two prism fixing pieces (1025) are a first prism fixing piece (1025a) and a second prism fixing piece (1025 b);

the first prism fixing piece (1025a) comprises a baffle (10251a1), and an elastic sheet (10252) of the first prism fixing piece (1025a) abuts against a designated side face of the third prism (10233);

the elastic piece (10252) of the second prism fixing piece (1025b) comprises a first elastic piece (10252a) and a second elastic piece (10252b), the first elastic piece (10252a) abuts against one bottom surface of the second prism (10232) and presses the other bottom surface against the baffle (10251a1) of the first prism fixing piece (1025a), and the second elastic piece (10252b) abuts against the appointed side surface of the second prism (10232).

6. A laser projection device as claimed in claim 2, wherein the optical axis of the laser projection device passes through the light incident surface (10231a) of the first prism (10231) and the light emitting surface (10232c) of the second prism (10232), the dmd (1024) being located at one side of the optical axis.

7. A laser projection device as claimed in any one of claims 2 to 6, wherein the prism assembly (1023) further comprises: a third prism (10233);

the third prism (10233) is located between an exit surface (10231b) of the first prism (10231) and a reflective surface (10232b) of the second prism (10232).

8. A laser projection device as claimed in any one of claims 1 to 6, wherein the light adjustment assembly (1022) comprises a light pipe (10221) and a light collecting lens (10222);

the light guide (10221) comprises a light inlet (10221a) and a light outlet (10221b), and the light guide (10221) is fixedly connected with the shell (1021);

the light receiving lens (10222) is positioned at the light outlet (10221b) and is fixedly connected with the shell (1021).

9. The laser projection device of claim 8, further comprising a contoured cover plate (1026) corresponding to the light collecting lens (10222), wherein the housing (1021) has a contoured mirror groove corresponding to the light collecting lens (10222), the light collecting lens (10222) is located in the contoured mirror groove, and the contoured cover plate (1026) is buckled on the contoured mirror groove to fix the light collecting lens (10222) in the contoured mirror groove.

10. A laser projection device as claimed in claim 9, characterized in that the profiled cover sheet (1026) is provided with a flexible layer on a side close to the light collecting lens (10222).