CN112034669A

CN112034669A - Laser projection device

Info

Publication number: CN112034669A
Application number: CN201910477469.7A
Authority: CN
Inventors: 曹秀燕
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2020-12-04
Also published as: WO2020244050A1

Abstract

The application discloses laser projection equipment belongs to projection technical field. The laser projection apparatus includes: light source system, ray apparatus system and camera lens, ray apparatus system include ray apparatus casing, DMD, lens subassembly, first speculum and RTIR subassembly, and light source system is connected with the first open end of ray apparatus casing, the camera lens with the second open end of ray apparatus casing is connected. In this application, because the RTIR subassembly has small advantage, consequently, after obtaining the ray apparatus system through ray apparatus casing, lens subassembly, RTIR subassembly and DMD assembly, can make the structure of ray apparatus system more simplified, the volume is more compact. In addition, because the included angle between the first reflector and the bottom surface of the optical machine shell is adjustable, the light spots formed by the light beams can completely cover the DMD through adjustment of the first reflector, and high-efficiency transmission of the light beams is realized.

Description

Laser projection device

Technical Field

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

Background

A laser projection apparatus is a display apparatus for generating a projection picture. At present, laser projection equipment mainly comprises a light source system, an optical-mechanical system and a lens, wherein the light source system is used for providing light beams for the optical-mechanical system, the optical-mechanical system is used for modulating the light beams provided by the light source system, and the modulated light beams are emitted to the lens to obtain a projection picture.

Because the optical-mechanical system is a core component of the laser projection device, the size of the optical-mechanical system largely determines the size of the laser projection device, and therefore the structure of the optical-mechanical system needs to be adjusted, and the size of the laser projection device is reduced under the condition of reducing the size of the optical-mechanical system.

Disclosure of Invention

The application provides a laser projection equipment, can solve the great problem of laser projection equipment size. The technical scheme is as follows:

in one aspect, the present application provides a laser projection apparatus, comprising: the optical-mechanical system comprises an optical-mechanical shell, a Digital Micromirror Device (DMD), a lens assembly, a first reflector and a Refraction Total Internal Reflection (RTIR) assembly;

the light source system is connected with a first opening end of the optical-mechanical shell, the lens is connected with a second opening end of the optical-mechanical shell, and the first opening end and the second opening end are perpendicular or parallel to each other;

the DMD is arranged on the top surface of the optical machine shell and is perpendicular to the second opening end, the lens assembly and the first reflector are both fixed on the bottom surface of the optical machine shell, the RTIR assembly is fixed on the top surface of the optical machine shell, the light inlet side of the lens assembly faces the first opening end, the first reflector is located below the RTIR assembly, the RTIR assembly is located below the DMD, the light outlet side of the RTIR assembly faces the second opening end, and an included angle between the first reflector and the bottom surface of the optical machine shell is adjustable;

the light beam emitted by the light source system is transmitted to the first reflector through the lens assembly, the transmitted light beam is reflected to the RTIR assembly through the first reflector, the reflected light beam is refracted to the DMD through the RTIR assembly, the refracted light beam is reflected to the RTIR assembly through the DMD in a rotating mode, and the light beam reflected in the rotating mode is totally reflected to the lens through the RTIR assembly.

Optionally, the opto-mechanical system further comprises a second mirror, the lens assembly comprising a first lens and a second lens;

the first lens is a concave-convex lens, the second lens is a double-convex lens, the concave surface of the first lens faces the first opening end, the first lens is positioned between the second reflector and the first opening end, the second lens is positioned between the second reflector and the first reflector, and the second reflector is fixed on the inner wall of the optical engine shell;

the light beam emitted by the light source system is transmitted to the second reflector through the first lens, the light beam transmitted by the first lens is reflected to the second lens through the second reflector, and the light beam reflected by the second reflector is transmitted to the RTIR component through the second lens.

Optionally, the optical-mechanical system further includes a first light blocking sheet, the first light blocking sheet is fixed to the bottom surface of the optical-mechanical housing, the first light blocking sheet is located between the second reflecting mirror and the second lens, and an overlapping area exists between an orthographic projection of the first light blocking sheet on the second lens and the second lens.

Optionally, the opto-mechanical system further comprises at least one elastic member and three first fixing members;

the first end of at least one elastic component with first speculum is connected, the second end of at least one elastic component with the bottom surface of ray apparatus casing is connected, the one end of three first fixed component is passed the bottom surface of ray apparatus casing with first speculum contact, three first fixed component is triangular distribution, arbitrary first fixed component in the three first fixed component can be adjusted first speculum with the distance between the bottom surface of ray apparatus casing.

Optionally, the RTIR assembly comprises a wedge prism and a plano-convex lens;

the wedge-shaped prism is located between the plano-convex lens and the DMD, a first side surface of the wedge-shaped prism is parallel to the DMD, a second side surface of the wedge-shaped prism is parallel to the second opening end, and a third side surface of the wedge-shaped prism is glued with the plane of the plano-convex lens.

Optionally, a first bearing surface, a second bearing surface and a third bearing surface are arranged on the top surface of the optical engine housing, the second side surface, the first bottom surface and the second bottom surface of the wedge-shaped prism respectively and correspondingly bear against the first bearing surface, the second bearing surface and the third bearing surface, and the third side surface of the wedge-shaped prism is fixed on the top surface of the optical engine housing through at least two second fixing members.

Optionally, the opto-mechanical system further includes a fixing bracket, the lens assembly is fixed on the fixing bracket, and the fixing bracket is fixed on the bottom surface of the opto-mechanical housing.

Optionally, the optical-mechanical system further comprises a light guide rod, the light guide rod is fixed on the bottom surface of the optical-mechanical housing, one end of the light guide rod faces the light source system, and the other end of the light guide rod faces the light incident side of the lens assembly.

Optionally, the optical-mechanical system further includes a galvanometer, the galvanometer is fixed on the bottom surface of the optical-mechanical housing and located between the RTIR assembly and the second open end of the optical-mechanical housing, and the galvanometer is parallel to the second open end of the optical-mechanical housing.

Optionally, the optical-mechanical system further includes a second light barrier, the second light barrier is fixed to the bottom surface of the optical-mechanical housing, the second light barrier is located between the galvanometer and the RTIR component, and the second light barrier is used for blocking the light beam that cannot be emitted to the lens after the DMD is rotated and reflected.

In another aspect, the present application provides an optical engine comprising: the optical-mechanical system comprises an optical-mechanical shell, a DMD (digital mirror device), a lens assembly, a first reflector and an RTIR (real time IR) assembly;

the light source system is connected with the first opening end of the optical-mechanical shell, and the lens is connected with the second opening end of the optical-mechanical shell;

the DMD is arranged on the top surface of the optical machine shell and is perpendicular to the second opening end of the optical machine shell, the lens assembly and the first reflector are both fixed on the bottom surface of the optical machine shell, the RTIR assembly is fixed on the top surface of the optical machine shell, the light inlet side of the lens assembly faces the first opening end, the first reflector is positioned below the RTIR assembly, the RTIR assembly is positioned below the DMD, the light outlet side of the RTIR assembly faces the second opening end, and an included angle between the first reflector and the bottom surface of the optical machine shell is adjustable;

the light beam emitted by the light source system is transmitted to the first reflector through the lens assembly, the transmitted light beam is reflected to the RTIR assembly through the first reflector, the reflected light beam is refracted to the DMD through the RTIR assembly, the refracted light beam is reflected to the RTIR assembly through the DMD in a rotating mode, and the light beam reflected in the rotating mode is totally reflected to the second opening end through the RTIR assembly.

The technical scheme provided by the application has the beneficial effects that:

in this application, because the RTIR subassembly has small advantage, consequently, after obtaining the ray apparatus system through ray apparatus casing, lens subassembly, RTIR subassembly and DMD assembly, can make the structure of ray apparatus system more simplified, the volume is more compact. Like this, connect light source system at the first open end of ray apparatus system, can make laser projection equipment's volume more compact after the second open end of ray apparatus system connects the camera lens, and then do benefit to laser projection equipment's miniaturization. In addition, because the contained angle between the bottom surface of first speculum and ray apparatus casing is adjustable, like this, adjust the position of first speculum to guarantee that the facula that the light beam after the RTIR subassembly refraction formed can cover DMD's workspace completely.

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 structural diagram of a laser projection apparatus provided in an embodiment of the present application;

fig. 2 is a schematic cross-sectional view of an opto-mechanical system according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a light source system according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a fixing bracket according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of an optical-mechanical system according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of an exploded structure of a second mirror holder according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a first light barrier provided in an embodiment of the present application;

fig. 8 is an exploded view of an opto-mechanical system according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of another opto-mechanical system according to an embodiment of the present disclosure;

FIG. 10 is a pixel distribution diagram of a projection screen according to an embodiment of the present disclosure;

FIG. 11 is a pixel distribution diagram of another projection screen provided in the embodiments of the present application;

FIG. 12 is a pixel distribution diagram of a projection screen according to another embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of a galvanometer provided in an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of another galvanometer provided in an embodiment of the present application;

FIG. 15 is a schematic structural diagram of a stent provided in an embodiment of the present application;

fig. 16 is a schematic structural view of a second blocking plate provided in the embodiment of the present application;

fig. 17 is a schematic structural diagram of an optical engine according to an embodiment of the present application.

Reference numerals:

1: a light source system; 2: an opto-mechanical system; 3: a lens;

201: a light machine shell; 202: DMD; 203: a lens assembly; 2031: a first lens; 2032: a second lens; 204: a first reflector; 205: an RTIR component; 2051: a wedge prism; 2052: a plano-convex lens; 206: a second reflector; 207: a first light-blocking sheet; 208: fixing a bracket; 209: a light guide rod; 210: a galvanometer; 211: and a second light blocking sheet.

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. 1 illustrates a schematic structural diagram of a laser projection apparatus according to an embodiment of the present application, and fig. 2 illustrates a schematic cross-sectional structural diagram of an optical-mechanical system according to an embodiment of the present application. As shown in fig. 1 and 2, the laser projection apparatus includes: light source system 1, ray apparatus system 2 and camera lens 3, ray apparatus system 2 includes ray apparatus casing 201, DMD202, lens subassembly 203, first speculum 204 and RTIR subassembly 205, and light source system 1 is connected with the first open end of ray apparatus casing 201, and camera lens 3 is connected with the second open end of ray apparatus casing 201, and first open end and second open end mutually perpendicular or parallel.

The DMD202 is disposed on the top surface of the optical engine housing 201, and is perpendicular to the second open end, the lens assembly 203 and the first mirror 204 are both fixed on the bottom surface of the optical engine housing 201, the RTIR assembly 205 is fixed on the top surface of the optical engine housing 201, the light incident side of the lens assembly 203 faces the first open end, the first mirror 204 is located below the RTIR assembly 205, the RTIR assembly 205 is located below the DMD202, the light emergent side of the RTIR assembly 205 faces the second open end, and an included angle between the first mirror 204 and the bottom surface of the optical engine housing 201 is adjustable. The light beam emitted from the light source system 1 is transmitted to the first reflector 204 through the lens assembly 203, the transmitted light beam is reflected to the RTIR assembly 205 through the first reflector 204, the reflected light beam is refracted to the DMD202 through the RTIR assembly 205, the refracted light beam is reflected to the RTIR assembly 205 through the DMD202 in a rotating manner, and the light beam reflected in the rotating manner is totally reflected to the lens 3 through the RTIR assembly 205.

In the embodiment of the present application, since the RTIR component 205 has an advantage of small volume, after the optical-mechanical system 2 is assembled by the optical-mechanical housing 201, the lens component 203, the RTIR component 205, and the DMD202, the structure of the optical-mechanical system 2 can be simplified, and the volume is more compact. Like this, connect light source system 1 at the first open end of ray apparatus system 2, can make laser projection equipment's volume more compact after the second open end of ray apparatus system 2 connects camera lens 3, and then do benefit to laser projection equipment's miniaturization. In addition, since the included angle between the first reflecting mirror 204 and the bottom surface of the optical mechanical housing 201 is adjustable, the position of the first reflecting mirror 204 is adjusted to ensure that the light spot formed by the light beam refracted by the RTIR component 205 can completely cover the working area of the DMD 202.

The light source system 1 is a three-color laser system, and as an example, the three-color laser system may include a green laser, a red laser, and a blue laser, so that three red, green, and blue light beams may be emitted directly through the three lasers. In some embodiments, as shown in fig. 3, the three-color laser system may be a three-color MCL laser, specifically including a green laser located in the first row, a blue laser located in the second row, and a red laser located in the third and fourth rows, respectively. The lens 3 may be composed of a series of lenses to ensure the projection effect of the light beam on the screen after the light beam emitted from the optical-mechanical system 2 is transmitted through the lens 3.

In the embodiment of the present application, the optical housing 201 includes an opening housing obtained by a mold molding method, and a cover plate for sealing the opening housing. After the lens assembly 203 and the first mirror 204 are fixedly mounted on the bottom surface of the open housing, and the DMD202 and the RTIR assembly 205 are fixed on the cover plate, that is, the top surface of the opto-mechanical housing 201, the open housing is sealed by the cover plate to obtain the opto-mechanical system 2. Of course, the optical-mechanical housing 201 may be obtained in other manners as long as the lens assembly 203, the RTIR assembly 205, and the DMD202 can be fixedly assembled, which is not limited in this embodiment of the application.

In this embodiment, as shown in fig. 2, when the DMD202 is disposed on the top surface of the optical device housing 201, a light-transmitting opening needs to be disposed on the top surface of the optical device housing 201 to ensure that the DMD202 faces the inside of the optical device housing 201 after being connected to the outer wall of the optical device housing 201. In some embodiments, can form light-transmitting opening on the apron of ray apparatus casing 201 through the fashioned mode of mould to can guarantee the degree of accuracy in light-transmitting opening's position, and then improve DMD 202's assembly precision when assembling DMD202, avoid follow-up processing to light-transmitting opening alone, because of the deviation of light-transmitting opening that machining error caused, thereby cause DMD 202's installation error.

When the DMD202 rotates and reflects the light beam refracted by the RTIR element 205, in some embodiments, when an included angle between a micro mirror included in the DMD202 and the bottom surface of the optical mechanical housing is a first rotation angle, the light beam reflected and rotated by the DMD202 may be totally reflected by the RTIR element 205 and emitted to the lens 3, and when the included angle between the micro mirror included in the DMD202 and the bottom surface of the optical mechanical housing is a second rotation angle, the light beam reflected and rotated by the DMD202 may not be emitted to the lens 3.

The first rotation angle and the second rotation angle may be preset, for example, the first rotation angle may be 10 degrees, the second rotation angle may be-10 degrees, or the first rotation angle may be 12 degrees, the second rotation angle may be-12 degrees, and the like.

In the embodiment of the present application, as shown in fig. 4 and fig. 5, the opto-mechanical system 2 may further include a fixing bracket 208, the lens assembly 203 is fixed on the fixing bracket 208, and the fixing bracket 208 is fixed on the bottom surface of the opto-mechanical housing 201.

When the components are assembled on the optical-mechanical housing, assembly errors inevitably occur, and especially when the optical-mechanical system includes many components, the optical path of the optical-mechanical system is prone to be deviated due to accumulation of errors, and thus, light spots formed by light beams cannot completely cover the working area of the DMD 202. Therefore, in the embodiment of the application, in the assembling process of the optical-mechanical system, the lens assembly 203 can be fixed with the optical-mechanical housing 201 as a whole through the fixing support 208, so that the number of components assembled with the optical-mechanical housing 201 is reduced, the accumulated error in the assembling process is reduced, and the light spot formed by the light beam can completely cover the working area of the DMD 202.

In addition, the lens assembly 203 is integrally fixed through the fixing support 208, so that when the lens assembly 203 needs to be adjusted, only the fixing support 208 needs to be replaced, the replacement of the optical machine housing 201 is avoided, and the universalization of the optical machine housing 201 is facilitated.

In some embodiments, the opto-mechanical system 2 may further include at least one elastic element and three first fixing members, a first end of the at least one elastic element is connected to the first reflector 204, a second end of the at least one elastic element is connected to the bottom surface of the opto-mechanical housing 201, one end of the three first fixing members passes through the bottom surface of the opto-mechanical housing 201 and contacts with the first reflector 204, the three first fixing members are distributed in a triangular shape, and any one of the three first fixing members can adjust a distance between the first reflector 204 and the bottom surface of the opto-mechanical housing 201.

That is, the length of any one of the three first fixing members extending out of the bottom surface of the optical-mechanical housing 201 can be adjusted, and at this time, the first reflecting mirror 204 can rotate by using the straight line where the other two first fixing members are located as a rotating shaft, so as to adjust an included angle between the first reflecting mirror 204 and the bottom surface of the optical-mechanical housing 201, and further adjust the distance between the first reflecting mirror 204 and the bottom surface of the optical-mechanical housing 201.

At least one elastic element between the first reflector 204 and the bottom surface of the optical-mechanical housing 201 is in a compressed state, so that the first reflector 204 can be fixed between the first reflector 204 and the bottom surface of the optical-mechanical housing 201 under the thrust action of the three first fixing members.

As an example, the three first fixing members include one shoulder screw and two adjusting screws, and the three first fixing members are distributed in a right triangle, and the shoulder screws may be distributed at the intersection of the right-angled sides. Can set up three elastic component between the bottom surface of first speculum 204 and ray apparatus casing 201, these three elastic component are the spring, and these three spring can overlap respectively on shoulder screw and adjusting screw, like this, can adjust arbitrary adjusting screw in two adjusting screw, with the distance between the bottom surface of increase or reduction first speculum 204 and ray apparatus casing 201, later first speculum can be under the taut effect of the spring of cover on this arbitrary adjusting screw, the straight line that uses a shoulder screw and another adjusting screw to place rotates as the rotation axis, thereby the realization is to the adjustment of the contained angle between the bottom surface of first speculum 204 and ray apparatus casing 201. In addition, the first reflecting mirror 204 and the bottom surface of the optical machine shell 201 are tensioned by three springs, so that the stability of the first reflecting mirror 204 can be ensured after the first reflecting mirror 204 is adjusted.

In this embodiment, as shown in fig. 4 and fig. 5, the optical-mechanical system 2 may further include a second reflector 206, the lens assembly 203 includes a first lens 2031 and a second lens 2032, the first lens 2031 is a meniscus lens, the second lens 2032 is a biconvex lens, a concave surface of the first lens 2031 faces the first opening end, the first lens 2031 is located between the second reflector 206 and the first opening end, the second lens 2032 is located between the second reflector 206 and the first reflector 204, and the second reflector 206 is fixed on an inner wall of the optical-mechanical housing 201. Thus, the light beam emitted from the light source system 1 can be transmitted to the second reflector 206 through the first lens 2031, the light beam transmitted by the first lens 2031 can be reflected to the second lens 2032 through the second reflector 206, and the light beam reflected by the second reflector 206 can be transmitted to the RTIR component 205 through the second lens 2032.

In order to ensure that the light spot formed by the light beam emitted from the light source system 1 can completely cover the working area of the DMD202, the first lens 2031 may be used to diffuse the light beam emitted from the light source system 1, so as to enlarge the area of the light spot formed by the light beam. After the first lens 2031 diffuses the light beam emitted from the light source system 1, in order to avoid the light spot area formed by the light beam being too large and the light spot formed by the light beam covering the non-working area of the DMD202, the light beam after diffusion processing can be converged by the second lens 2032, so as to avoid that part of the light beam hits other places of the optical engine housing 201 or hits the non-working area of the DMD202, thereby improving the transmission efficiency of the light beam, and avoiding the local temperature rise of the optical engine housing 201 and causing the failure of the laser projection device.

The first lens 2031 may be a positive lens or a negative lens, as long as the light beam emitted from the light source system 1 can be diffused, which is not limited in the embodiment of the present application. When the first lens 2031 and the second lens 2032 are fixed on the fixing bracket 208, grooves matched with the first lens 2031 and the second lens 2032 are provided on the fixing bracket 208, and after the first lens 2031 and the second lens 2032 are respectively mounted in the corresponding grooves, the fixing can be realized by a cover and rubber on the upper parts of the first lens 2031 and the second lens 2032. Since the upper cover applies pressure to the first lens 2031 and the second lens 2032 through rubber, respectively, the stability of the assembly of the first lens 2031 and the second lens 2032 can be ensured.

It should be noted that, when the opto-mechanical system 2 includes the fixing bracket 208, since the first mirror 204 is fixed on the bottom surface of the opto-mechanical housing 201, the fixing and adjustment of the first mirror 204 are not easy to control. In some embodiments, the second mirror 206 is adjustably secured to the inner wall of the opto-mechanical housing 201, such that the adjustment of the first mirror may be replaced by an adjustment of the second mirror 206.

The first mirror 204 may be fixed to the fixing bracket 208 when adjusted by the second mirror 206, so that the lens assembly 203 and the first mirror 204 may be fixed to the fixing bracket 208 as a whole, thereby further assembling the number of components with the optical housing 201.

As shown in fig. 6, the second reflecting mirror 206 and the inner wall of the optical-mechanical housing 201 may be fixed according to a fixing manner between the first reflecting mirror 204 and the bottom surface of the optical-mechanical housing 201, which is not described herein again in this embodiment of the present application.

After the diffusion-processed light beams are converged by the second lens 2032, a part of the light beams may still impinge on the compression ring of the lens 3, which may cause an excessive temperature of the lens 3 and a temperature drift of the lens 3. Therefore, as shown in fig. 5, the optical-mechanical system 2 may further include a first light blocking sheet 207, the first light blocking sheet 207 is fixed on the bottom surface of the optical-mechanical housing 201, the first light blocking sheet 207 is located between the second reflector 206 and the second lens 2032, and there is an overlapping area between the orthographic projection of the first light blocking sheet 207 on the second lens 2032 and the second lens 2032. The temperature drift is a phenomenon that an image of a display screen is shifted in a horizontal or vertical direction.

After the first light blocking sheet 207 is disposed between the first lens 2031 and the second lens 2032, a part of light beams striking the lower portion of the second lens 2032 can be blocked by the first light blocking sheet 207, so that the light beams striking the lower portion of the second lens 2032 are prevented from being converged and then striking the press ring of the lens 3, and heat generated by the light beams striking the first light blocking sheet 207 can be transferred to the optical engine housing 201, thereby preventing the lens 3 from being subjected to temperature drift.

In some embodiments, the first light blocking sheet 207 may be a light blocking sheet provided with an elliptical hole, and when the first light blocking sheet 207 is fixedly installed, a long axis of the elliptical hole may be parallel to the bottom surface of the light engine case 201. Since the outer contour of the second lens 2032 is generally circular, the orthographic projection of the first light blocking sheet 207 on the second lens 2032 can be located at the lower part of the second lens 2032, so that part of the light beam hitting the lower part of the second lens 2032 can be blocked by the first light blocking sheet 207.

It should be noted that, when the first light blocking sheet 207 is installed and fixed, since the top of the optical chassis 201 needs to be provided with a cover plate, in order to avoid the limitation of the first light blocking sheet 207, the upper portion of the first light blocking sheet 207 may be cut off, and the structure of the cut-off first light blocking sheet 207 may be as shown in fig. 7.

In addition, the first light blocking sheet 207 may be disposed between the second reflecting mirror 206 and the second lens 2032, or may be disposed at other positions as long as it can prevent a part of the light beam converged by the second lens 2032 from hitting the lens 3 pressing ring. For example, the first light blocking sheet 207 may be disposed on a side of the second lens 2032 away from the second reflecting mirror 206, which is not limited in this embodiment.

In the embodiment of the application, as shown in fig. 8, the RTIR assembly 205 may include a wedge prism 2051 and a plano-convex lens 2052, the wedge prism 2051 is located between the plano-convex lens 2052 and the DMD202, a first side of the wedge prism 2051 is parallel to the DMD202, a second side of the wedge prism 2051 is parallel to a second open end, and a third side of the wedge prism 2051 is glued to a plane of the plano-convex lens 2052.

Thus, the light beam transmitted by the lens assembly 203 can enter the planoconvex lens 2052 along the convex surface of the planoconvex lens 2052, then be refracted at the convex surface of the planoconvex lens 2052, and exit to the DMD202 along the first side surface of the wedge prism 2051. The DMD202 performs rotating reflection on the refracted light beam, and makes part of the light beam after rotating reflection enter the wedge prism 2051 along the first side surface of the third wedge prism 2051, and then totally reflects on the third side surface of the wedge prism 2051 and exits to the lens 3 along the second side surface of the wedge prism 2051.

In order to ensure the installation accuracy of the RTIR assembly 205, in some embodiments, a first bearing surface, a second bearing surface and a third bearing surface may be disposed on the top surface of the carriage body 201, the second side surface, the first bottom surface and the second bottom surface of the wedge prism 2051 respectively bear on the first bearing surface, the second bearing surface and the third bearing surface, and the third side surface of the wedge prism 2051 is fixed on the top surface of the carriage body 201 by at least two second fixing members.

The first bearing surface, the second bearing surface and the third bearing surface may be bearing surfaces arranged along a depth direction of the carriage case 201. The second fixed component can be for pressing the piece including two faces of buckling, and like this, the first face of buckling that presses the piece can press in wedge prism 2051's third side, and the second face of buckling that presses the piece can with ray apparatus housing 201's bottom surface fixed connection to realize pressing the piece fixed to wedge prism 2051. Of course, the second fixing member may be other members as long as the wedge prism 2051 can be fixed on the bottom surface of the optical chassis 201, and this embodiment of the present application does not limit this.

In this embodiment, as shown in fig. 5 or fig. 8, the optical-mechanical system 2 may further include a light guide rod 209, the light guide rod 209 is fixed on the bottom surface of the optical-mechanical housing 201, one end of the light guide rod 209 faces the light source system 1, and the other end of the light guide rod 209 faces the light incident side of the lens assembly 203.

The light guide rod 209 can perform light uniformizing processing on the light beam emitted from the light source system 1. The light guide rod 209 may be a rectangular light guide rod or a circular light guide rod, i.e., the cross-section of the channel of the light guide rod 209 may be rectangular or circular. Since the light spot formed by the light beam emitted from the light source system 1 is rectangular, the light guide rod 209 can be fixed to the bottom surface of the carriage case 201 in order to avoid the position change of the light guide rod 209 and the large influence on the light spot formed by the light beam. In some embodiments, since the end of the light guide rod 209 facing the lens assembly 203 is more sensitive to the light beam emitted after the light is homogenized, the light guide rod 209 may be fixed in a manner of rear end fixation, that is, the end of the light guide rod 209 facing the lens assembly 203 is fixed. For example, a fourth bearing surface and a fifth bearing surface may be disposed on the bottom surface of the optical device housing 201, then the side surface of the light guide rod 209 is supported on the bottom surface of the optical device housing 201 and the fourth bearing surface, and the end of the light guide rod 209 facing the light incident side of the lens assembly 203 is supported on the fifth bearing surface, then the glue is dispensed between the bottom surface of the optical device housing 201 and the light guide rod 209, and the light guide rod 209 is fixedly connected to the bottom surface of the optical device housing 201 by the second fixing member, thereby fixing the light guide rod 209.

Further, when carrying out even light processing through the light beam of light guide rod 209 to light source system 1 outgoing, can be at the front end of light guide rod 209, also be the light guide rod 209 towards the one end of first open end set up the third light-blocking piece, thereby can shelter from the invalid part of the front end of light guide rod 209 through the third shielding piece, guarantee only the interior aperture of the front end of light guide rod 209 and play a role, so can make the light that light source system 1 sent all pass through light guide rod 209, can prevent again that external environment's stray light from passing through the invalid part entering light guide rod 209 of light guide rod 209, thereby improve the homogenization effect of light beam.

It should be noted that the size of the cross section of the channel of the light guide rod 209 may be in a preset ratio to the size of the working area of the DMD202, so as to ensure that the light beam transmitted through the lens assembly 203 can just cover the working area of the DMD202, thereby ensuring the imaging effect of the laser projection apparatus, and avoiding the temperature increase of the non-working area of the DMD202 caused by the light beam hitting the non-working area of the DMD 202.

In this embodiment, as shown in fig. 9, the optical-mechanical system 2 may further include a vibrating mirror 210, the vibrating mirror 210 is fixed on the bottom surface of the optical-mechanical housing 201 and is located between the RTIR component 205 and the second open end of the optical-mechanical housing 201, and the vibrating mirror 210 is parallel to the second open end of the optical-mechanical housing 201.

The galvanometer 210 may enable a projected picture to achieve 4k resolution. In some embodiments, the pixel arrangement of the projection image implemented by the DMD202 may be as shown in fig. 10, and the galvanometer 210 may deflect the pixel of the projection image of the DMD202 by a certain angle through vibration as shown in fig. 11, so that after the two are superimposed, the arrangement of the pixel of the image presented on the image may be as shown in fig. 12, thereby implementing the 4K resolution of the projection image.

In some embodiments, as shown in fig. 13, the galvanometer 210 is provided with two shorter ear plates and two longer ear plates along a direction perpendicular to the mirror surface, and the four ear plates are provided with through holes, so that two positioning posts corresponding to the two shorter ear plates one to one and two threaded holes corresponding to the two longer ear plates one to one can be arranged in the optical engine housing 201 along the depth direction, so that the two shorter ear plates on the galvanometer 210 can be correspondingly sleeved on the two positioning posts, and the two longer ear plates can be fixedly connected with the two corresponding threaded holes through positioning pieces, so as to fix the galvanometer 210 along the depth direction, thereby avoiding mechanical vibration of the optical engine housing 201 caused by vibration, reducing the fixing process of the galvanometer 210, and improving the fixing efficiency of the galvanometer 210.

In other embodiments, as shown in fig. 14, four through holes are formed in the galvanometer 210, in order to fix the galvanometer 210 in the depth direction of the optical machine housing 201, the optical machine system 2 may further include a galvanometer bracket as shown in fig. 15, through holes matched with lenses of the galvanometer 210 are formed in the galvanometer bracket, the fixing of the galvanometer 210 and the galvanometer bracket is realized through the four through holes in the galvanometer 210, and then the fixing of the galvanometer bracket and the bottom surface of the optical machine housing 201 is realized, so that the fixing of the galvanometer 210 in the depth direction of the optical machine housing 201 is realized. Thus, when the galvanometer 210 needs to be replaced, only the galvanometer bracket and the galvanometer 210 need to be replaced as a whole, and the optical machine housing 201 does not need to be replaced, so that the optical machine housing 201 is beneficial to generalization.

It should be noted that, when the DMD202 is located at the second rotation angle, the light beam reflected by the rotation of the DMD202 cannot exit to the lens 3, and at this time, the light beam may strike the galvanometer, so that the temperature of the galvanometer 210 is easily increased, which affects the reliability of the galvanometer 210 and reduces the 4K effect of the projection image, as shown in fig. 9, the optical-mechanical system 2 may further include a second light blocking plate 211, the second light blocking plate 211 is fixed on the bottom surface of the optical-mechanical housing 201, the second light blocking plate 211 is located between the galvanometer 210 and the RTIR component 205, and the second light blocking plate 211 is used for blocking the light beam reflected by the rotation of the DMD202 and cannot exit to the lens 3.

The part of the light beam which cannot be emitted to the lens 3 can be incident on the second light baffle 211, so that the heat generated by the part of the light beam is absorbed by the second light baffle 211, and the generated heat is transferred to the optical machine shell 201, thereby avoiding the temperature rise phenomenon possibly generated by the galvanometer 210.

The structure of the second light blocking sheet 211 may be an L-shaped structure as shown in fig. 16, a bending portion of a short side of the second light blocking sheet 211 is fixed to the optical engine housing 201, and the short side and the long side of the second light blocking sheet 211 may be attached to the polarizer 210 to block the light beam that cannot exit to the light exit of the optical engine housing 201 after the DMD202 rotates and reflects. Of course, the second light blocking plate 211 may have other structures, and the embodiment of the present application is not limited thereto.

It should be noted that the orientation terms referred to in the embodiments of the present application are only used for explaining the structure of the laser projection apparatus and are not limited to the orientations shown in the corresponding drawings in fig. 1, fig. 2, fig. 5, fig. 8, and fig. 10.

In the embodiment of the application, because the RTIR subassembly has small advantage, consequently, after the ray apparatus system that obtains through ray apparatus casing, lens subassembly, RTIR subassembly and DMD assembly, can make the structure of ray apparatus system more simplified, the volume is compacter. Like this, connect light source system at the first open end of ray apparatus system, can make laser projection equipment's volume more compact after the second open end of ray apparatus system connects the camera lens, and then do benefit to laser projection equipment's miniaturization. Because lens subassembly and the speculum that the ray apparatus system includes pass through the fixed bolster to fix in the ray apparatus casing to can guarantee that lens subassembly and speculum are fixed with the ray apparatus casing as a whole, reduce the quantity with the fixed component of ray apparatus casing, guarantee the accuracy of ray apparatus system assembly. In addition, when the optical-mechanical system needs to be optimized, only the structure of the fixing support needs to be replaced and optimized, and the whole optical-mechanical shell does not need to be replaced, so that the universality of the optical-mechanical shell is facilitated.

Fig. 17 illustrates a structural diagram of an optical engine according to an embodiment of the present application, and fig. 2 illustrates a cross-sectional structural diagram of an optical-mechanical system according to an embodiment of the present application. As shown in fig. 2 and 17, the optical engine may include: light source system 1 and ray apparatus system 2, ray apparatus system 2 includes ray apparatus casing 201, digital micro mirror device DMD202, lens subassembly 203, first speculum 204 and refraction total reflection RTIR subassembly 205, light source system 1 is three-colour laser system, and light source system 1 is connected with the first open end of ray apparatus casing 201, DMD202 sets up the top surface at ray apparatus casing 201, and perpendicular with the second open end of ray apparatus casing 201, lens subassembly 203 and first speculum 204 are all fixed on the bottom surface of ray apparatus casing 201, RTIR subassembly 205 is fixed at the top surface of ray apparatus casing 201, the income light side of lens subassembly 203 is towards the first open end, first speculum 204 is located the below of RTIR subassembly 205, RTIR subassembly 205 is located the below of DMD202, the play light side of RTIR subassembly 205 is towards the second open end, and the contained angle between the bottom surface of first speculum 204 and ray apparatus casing 201 is adjustable. The light beam emitted from the light source system 1 is transmitted to the first reflector 204 through the lens assembly 203, the transmitted light beam is reflected to the RTIR assembly 205 through the first reflector 204, the reflected light beam is refracted to the DMD202 through the RTIR assembly 205, the refracted light beam is reflected to the RTIR assembly 205 through the DMD202 in a rotating manner, and the light beam reflected in the rotating manner is totally reflected to the second opening end through the RTIR assembly 205.

It should be noted that the structures of the light source system 1 and the optical-mechanical system 2 may be the same as or similar to those described in the above embodiments, and the embodiments of the present application are not described herein again.

In the embodiment of the application, because the RTIR subassembly has small advantage, consequently, after the ray apparatus system that obtains through ray apparatus casing, lens subassembly, RTIR subassembly and DMD assembly, can make the structure of ray apparatus system more simplified, the volume is compacter. Therefore, the optical engine can be more compact in size after the first opening end of the optical-mechanical system is connected with the light source system, and the miniaturization of the optical engine is further facilitated. In addition, because the contained angle between the bottom surface of first speculum and ray apparatus casing is adjustable, like this, adjust the position of first speculum to guarantee that the facula that the light beam after the RTIR subassembly refraction formed can cover DMD's workspace completely.

The above description is only exemplary of the present application and should not be taken as limiting the present application, 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: the device comprises a light source system (1), an optical-mechanical system (2) and a lens (3), wherein the optical-mechanical system (2) comprises an optical-mechanical shell (201), a Digital Micromirror Device (DMD) (202), a lens component (203), a first reflector (204) and a refraction total reflection RTIR component (205);

the light source system (1) is connected with a first open end of the optical machine shell (201), the lens (3) is connected with a second open end of the optical machine shell (201), and the first open end and the second open end are perpendicular or parallel to each other;

DMD (202) set up the top surface of ray apparatus casing (201), and with the second open end is perpendicular, lens subassembly (203) with first speculum (204) are all fixed on the bottom surface of ray apparatus casing (201), RTIR subassembly (205) are fixed the top surface of ray apparatus casing (201), the income light side orientation of lens subassembly (203) first open end, first speculum (204) are located the below of RTIR subassembly (205), RTIR subassembly (205) are located the below of DMD (202), the play light side orientation of RTIR subassembly (205) the second open end, just first speculum (204) with the contained angle between the bottom surface of ray apparatus casing (201) is adjustable.

2. A laser projection device as claimed in claim 1, wherein the opto-mechanical system (2) further comprises a second mirror (206), the lens assembly (203) comprising a first lens (2031) and a second lens (2032);

the first lens (2031) is a meniscus lens, the second lens (2032) is a biconvex lens, the concave surface of the first lens (2031) faces the first open end, the first lens (2031) is located between the second reflector (206) and the first open end, the second lens (2032) is located between the second reflector (206) and the first reflector (204), and the second reflector (206) is fixed on the inner wall of the optical engine housing (201);

the light beam emitted by the light source system (1) is transmitted to the second reflector (206) through the first lens (2031), the light beam transmitted by the first lens (2031) is reflected to the second lens (2032) through the second reflector (206), and the light beam reflected by the second reflector (206) is transmitted to the RTIR component (205) through the second lens (2032).

3. The laser projection device according to claim 2, wherein the opto-mechanical system (2) further comprises a first light barrier (207), the first light barrier (207) is fixed on the bottom surface of the opto-mechanical housing (201), the first light barrier (207) is located between the second reflector (206) and the second lens (2032), and the orthographic projection of the first light barrier (207) on the second lens (2032) has an overlapping region with the second lens (2032).

4. The laser projection device according to claim 1, wherein the opto-mechanical system (2) further comprises at least one elastic element and three first fixation members;

the first end of at least one elastic component with first speculum (204) is connected, the second end of at least one elastic component with the bottom surface of ray apparatus casing (201) is connected, the one end of three first fixed component is passed the bottom surface of ray apparatus casing (201) with first speculum (204) contact, three first fixed component is triangle-shaped distribution, arbitrary first fixed component in the three first fixed component can adjust first speculum (204) with the distance between the bottom surface of ray apparatus casing (201).

5. The laser projection device of any of claims 1-4, wherein the RTIR assembly (205) comprises a wedge prism (2051) and a plano-convex lens (2052);

the wedge-shaped prism (2051) is located between the planoconvex lens (2052) and the DMD (202), a first side surface of the wedge-shaped prism (2051) is parallel to the DMD (202), a second side surface of the wedge-shaped prism (2051) is parallel to the second opening end, and a third side surface of the wedge-shaped prism (2051) is glued with the plane of the planoconvex lens (2052).

6. The laser projection device as claimed in claim 5, wherein the optical engine housing (201) is provided with a first bearing surface, a second bearing surface and a third bearing surface on the top surface, the second side surface, the first bottom surface and the second bottom surface of the wedge prism (2051) respectively bear on the first bearing surface, the second bearing surface and the third bearing surface correspondingly, and the third side surface of the wedge prism (2051) is fixed on the top surface of the optical engine housing (201) through at least two second fixing members.

7. A laser projection device as claimed in claim 1, wherein the opto-mechanical system (2) further comprises a fixing bracket (208), the lens assembly (203) being fixed on the fixing bracket (208), the fixing bracket (208) being fixed on a bottom surface of the opto-mechanical housing (201).

8. The laser projection device according to claim 1, wherein the opto-mechanical system (2) further comprises a light guide rod (209), the light guide rod (209) is fixed on the bottom surface of the opto-mechanical housing (201), one end of the light guide rod (209) faces the light source system (1), and the other end of the light guide rod (209) faces the light incident side of the lens assembly (203).

9. The laser projection device of claim 1, wherein the opto-mechanical system (2) further comprises a galvanometer (210), the galvanometer (210) is fixed on a bottom surface of the opto-mechanical housing (201) and is located between the RTIR component (205) and the second open end of the opto-mechanical housing (201), and the galvanometer (210) is parallel to the second open end of the opto-mechanical housing (201).

10. The laser projection device according to claim 9, wherein the opto-mechanical system (2) further comprises a second light barrier (211), the second light barrier (211) is fixed on the bottom surface of the opto-mechanical housing (201), the second light barrier (211) is located between the galvanometer (210) and the RTIR component (205), and the second light barrier (211) is used for blocking the light beam that cannot exit to the lens (3) after the DMD (202) rotates and reflects.