CN113075845B

CN113075845B - Fixed subassembly of beam splitting prism and projection ray apparatus

Info

Publication number: CN113075845B
Application number: CN202011547233.5A
Authority: CN
Inventors: 朱青; 孙峰; 杨浩; 高怡玮
Original assignee: Shenzhen Anhua Optoelectronics Technology Co Ltd
Current assignee: Shenzhen Anhua Photoelectric Technology Co ltd
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2022-04-22
Anticipated expiration: 2040-12-23
Also published as: CN113075845A

Abstract

The invention discloses a fixing component for a beam splitter prism, which comprises a shell, the beam splitter prism, an upper cover, a first elastic piece, a second elastic piece and two third elastic pieces, wherein the shell is provided with a first side wall and a second side wall which are opposite to each other left and right; a rear limiting surface is arranged in an inner cavity of the shell, and a first boss and a second boss are respectively arranged on the first side wall and the second side wall; the beam splitter prism is arranged in the inner cavity of the shell, and the upper cover fixedly covers the upper mounting opening; the first elastic piece is connected with one end face of the beam splitting prism and the second boss; the second elastic piece is connected with the upper end of the beam splitting prism and the upper cover; the two third elastic pieces are respectively positioned on the front sides of the first boss and the second boss, and are connected with the lower end of the beam splitting prism and the shell. The invention also discloses a projection optical machine, and the stable beam splitting prism has high and compact structure practicability.

Description

Fixed subassembly of beam splitting prism and projection ray apparatus

Technical Field

The invention relates to the technical field of optical projection equipment, in particular to a beam splitter prism fixing assembly and a projection optical machine.

Background

The core component of the micro projector is a projector, and the beam splitter prism and the DMD optical modulator are two major core components of the projector. The accuracy of the relative position between the beam splitting prism and the DMD light modulator has a considerable impact on the projection quality. In the production process, in order to modulate the projector, the common practice includes: firstly, taking a DMD optical modulator as a fixed reference to adjust the position of a beam splitting prism; in contrast to the first method, the positions of the DMD light modulator and/or the lens are adjusted with the beam splitter prism as a fixed reference. The latter method requires a high and stable assembling height of the beam splitter prism itself.

In the related art, a housing of a projection optical machine has a cavity with an open top, a splitter prism is often installed in the cavity of the housing in a direction perpendicular to upper and lower end surfaces of the splitter prism, a rectangular modulation region of a DMD optical modulator, an initial incident surface of the splitter prism for receiving an illumination beam, and an imaging exit surface for transmitting an imaging beam to a projection lens are all perpendicular to a horizontal plane, that is, are parallel to the vertical direction. However, the spatial position of the beam splitter prism is changed into a structure that the initial incident surface of the beam splitter prism faces downwards, and at present, a mature scheme which is compact in structure and can ensure the stability of the beam splitter prism does not exist.

Disclosure of Invention

Based on the above situation, the main objective of the present invention is to provide a fixing assembly for a splitting prism and a projector capable of stably limiting the splitting prism arranged with an initial incident surface facing downward and having a compact structure.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a fixing component for a beam splitter prism comprises a shell, a beam splitter prism, an upper cover, a first elastic part, a second elastic part and two third elastic parts, wherein the shell is provided with an inner cavity, a front mounting port, a rear mounting port, an upper mounting port and a lower light inlet which are communicated with the inner cavity, and a first side wall and a second side wall which are oppositely arranged in the left-right direction, and the inner cavity is formed between the first side wall and the second side wall;

a rear limiting surface positioned on the periphery of the rear mounting port is arranged in the inner cavity, a first boss is arranged on the inner side surface of the first side wall, a second boss is arranged on the inner side surface of the second side wall, one opposite surface of each of the first boss and the second boss is provided with a first protruding strip, the two first protruding strips are adjacent to the lower light inlet, each first protruding strip obliquely downwards extends from back to front, a side limiting surface is formed on one surface of each first boss facing the second boss, and a lower limiting surface is formed on the top surface of each first protruding strip;

the beam splitter prism penetrates through the upper mounting opening and is mounted in the inner cavity of the shell, and the upper cover fixedly covers the upper mounting opening; the beam splitting prism comprises an initial incident surface, an emergent incident surface, a first end surface and a second end surface which are oppositely arranged in the left-right direction, and the first end surface is oppositely arranged with the first side wall;

the first elastic piece is connected with the second end face and the second boss so that the first end face is attached to the side limiting face; the second elastic piece is connected with the upper end of the beam splitter prism and the inner side surface of the upper cover so that the initial incidence surface is attached to the lower limiting surface and the emergent incidence surface is attached to the rear limiting surface; the two third elastic pieces are respectively positioned in the front side spaces of the inner cavity, which are positioned on the first boss and the second boss, and the two third elastic pieces are connected with the lower end of the beam splitter prism and the shell so that the emergent and incident surfaces are attached to the rear limiting surface.

Preferably, the inner side surface of the first side wall is further provided with a third boss located on the front side of the first boss and spaced from the first boss, and the inner side surface of the second side wall is further provided with a fourth boss located on the front side of the second boss and spaced from the second boss; and one of the two third elastic pieces is elastically abutted against the rear side surface of the third boss and connected with the lower end of the beam splitting prism, and the other third elastic piece is elastically abutted against the rear side surface of the fourth boss and connected with the lower end of the beam splitting prism.

Preferably, the fixing component of the splitting prism further comprises two bottom supporting pieces fixedly connected with the first end face and the second end face respectively, one bottom supporting piece is located between the first boss and the third boss, and the other bottom supporting piece is located between the second boss and the fourth boss;

the two bottom support pieces are respectively provided with a forward supporting surface, one third elastic piece is elastically abutted between the rear side surface of the third boss and the supporting surface of the adjacent bottom support piece, and the other third elastic piece is elastically abutted between the rear side surface of the fourth boss and the supporting surface of the adjacent bottom support piece.

Preferably, the bottom support piece comprises a side connecting plate and a front baffle, the side connecting plate of the bottom support piece is respectively attached and adhesively fixed to the first end face and the second end face, the front baffle is connected with one face, deviating from the beam splitting prism, of the side connecting plate, and the supporting face is formed on the front baffle.

Preferably, a chamfer inclined plane is arranged at the joint of the top surface of the first boss and the front side surface of the first boss.

Preferably, one surface of the second boss facing the first side wall is provided with an accommodating groove, and the accommodating groove extends to intersect with the top surface of the second boss along the up-down direction; the first elastic piece is embedded in the accommodating groove and elastically abutted to the second end face.

Preferably, one surface of the first boss facing the second side wall is provided with a first process groove, the first process groove extends to intersect with the top surface of the first boss along the up-down direction, and the side limiting surfaces are formed on two sides of the first process groove in the side view direction.

Preferably, the top surface of the first boss is centrally provided with a material reducing hole extending in the up-down direction.

Preferably, the inner side surface of the upper cover comprises a rear inclined surface, the upper end of the beam splitter prism is provided with a front abutting surface opposite to the rear inclined surface, the rear inclined surface and the front abutting surface are both arranged in a downward inclined mode from back to front, and the second elastic piece is elastically abutted between the rear inclined surface and the front abutting surface.

Preferably, the beam splitting prism includes a near side prism and a far side prism glued to each other, the initial incident surface and the exit incident surface are formed on the near side prism, the near side prism further includes a near side critical surface glued to the far side prism, and the front abutment surface is formed on a part of the near side critical surface protruding upwards out of the far side prism.

Preferably, the top of the distal prism has an exit connection surface adjacent to the proximal critical surface, the exit connection surface slants backward from top to bottom, and the proximal critical surface and the exit connection surface enclose a concave part with an upward opening;

the inner side surface of the upper cover further comprises a front inclined surface, the front inclined surface and the rear inclined surface extend into the concave portion, the upper cover is further provided with glue dispensing holes which penetrate through the outer side surface of the upper cover and the front inclined surface, the light splitting prism fixing assembly further comprises elastic glue, and the elastic glue flows through the glue dispensing holes and is solidified and bonded with the front inclined surface and the emergent connecting surface.

Preferably, a space is formed between the rear side surfaces of the first boss and the second boss and the rear wall surface of the inner cavity; the shell further comprises a first connecting part and a second connecting part, the first connecting part is connected with the rear side face of the first boss and the rear wall face of the inner cavity, and the second connecting part is connected with the rear side face of the second boss and the rear wall face of the inner cavity; the two first raised strips extend backwards to be connected with the first connecting part and the second connecting part respectively.

Preferably, the first connecting portion is connected to the lower portion of the first boss, a step structure is arranged at a connection position between one surface of the first connecting portion, which faces the second side wall, and the top surface of the first connecting portion, the bottom surface of the step structure is flush with the lower limiting surface, and the vertical surface of the step structure is closer to the first side wall than the side limiting surface.

Preferably, a second process groove is formed in the lower limiting surface close to the first boss, the second process groove comprises a front extension section and a rear extension section, the front extension section extends along the intersection line of the lower limiting surface and the side limiting surface, and the side extension section extends along the intersection line of the rear side surface of the first boss and the bottom surface of the stepped structure.

Preferably, the second connecting portion extends in the vertical direction and is in a long strip shape, one surface of the second connecting portion, facing the first side wall, is flush with one surface of the second boss, facing the first side wall, and a cavity is formed between one surface of the second connecting portion, facing away from the first side wall, and the second side wall.

Preferably, a fifth boss is arranged on the rear wall surface of the inner cavity, and in a backward observation visual angle, the fifth boss is positioned on the upper side of the rear mounting opening; in a downward viewing perspective, the fifth boss is located between left and right edges of the rear mounting opening; the rear limiting surface is formed on the front side surface of the fifth boss.

Preferably, the rear wall surface of the inner cavity is further provided with a second convex strip, the second convex strip is positioned on the lower side of the rear mounting opening in a rearward observation angle, and the second convex strip extends along the lower edge of the rear mounting opening; the rear limiting surface is formed on the front side surface of the second convex strip.

The invention also provides a projection optical machine which comprises the DMD optical modulator, a projection lens and the beam splitting prism fixing component, wherein the DMD optical modulator is arranged at the rear mounting port, and the projection lens is arranged at the front mounting port.

The fixing component of the beam splitting prism is matched with the first elastic piece through the side limiting surface in the left and right directions to limit the beam splitting prism; in the front and back directions, the limit of the lower end of the beam splitter prism is realized by the cooperation of a third elastic part and a back limit surface, and the limit of the upper end of the beam splitter prism is realized by the cooperation of a second elastic part and the back limit surface; the beam splitting prism is limited by the matching of the second elastic piece and the lower limiting surface in the up-down direction. Therefore, the limiting of the beam splitting prism is realized in three directions, wherein the second elastic part is also used for limiting in two directions and is connected with the inner side surface of the upper cover, and the distance between the second elastic part and the inner side surface of the upper cover is short, so that the structure is compact and the assembly is easy; secondly, the third elastic piece is installed to fully utilize the space at the rear sides of the first boss and the second boss, so that the design purpose of compact structure can be achieved; furthermore, the lower limiting surface is formed on the first convex strip with the narrower width, so that not only is the occupied space small, but also the lower limiting surface is easy to process and the flatness of the lower limiting surface is ensured. In summary, the fixing component of the splitting prism can realize the stable assembly of the splitting prism, has high practicability and corresponding compact structure.

Other advantages of the present invention will be described in the detailed description, and those skilled in the art will understand the technical features and technical solutions presented in the description.

Drawings

Preferred embodiments according to the present invention will be described below with reference to the accompanying drawings. In the figure:

FIG. 1 is a schematic perspective view of a preferred embodiment of a projection light machine according to the present invention, wherein the front side of the lens is a simulated projection beam;

FIG. 2 is a schematic top view of the projector of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG. 2;

FIG. 4 is a schematic view of a portion of the enlarged structure at A in FIG. 3;

FIG. 5 is a schematic side view of the projector of FIG. 1;

FIG. 6 is a schematic cross-sectional view taken along line VI-VI in FIG. 5;

FIG. 7 is a schematic view of a portion of the upper housing of FIG. 1;

FIG. 8 is an exploded view of the structure of FIG. 7;

FIG. 9 is a schematic view of the mating structures of the beam splitter prism, the bottom mounting member and the second elastic member of FIG. 8;

FIG. 10 is a schematic view of the structure of FIG. 9 from another angle;

FIG. 11 is a schematic structural view of the structure of FIG. 8 with the bottom bracket, the second elastic element, and the DMD light modulator removed;

FIG. 12 is a partial enlarged view of the structure at B in FIG. 11;

FIG. 13 is a schematic view of the structure of FIG. 11 from another angle;

FIG. 14 is an enlarged partial view of the structure at C in FIG. 13;

FIG. 15 is a top view of the structure of FIG. 8 with the upper cover, second spring, and DMD light modulator removed;

FIG. 16 is a schematic cross-sectional view taken along line XVI-XVI in FIG. 15;

FIG. 17 is an enlarged partial schematic view of FIG. 16 at D;

fig. 18 is a schematic sectional view taken along line XVIII-XVIII in fig. 15.

The reference numbers illustrate:

Detailed Description

In order to better illustrate the technical solution and the advantages of the fixing assembly of the splitting prism of the present invention, a projection light machine according to a preferred embodiment of the present invention will be described together with the fixing assembly of the splitting prism of the present invention.

Referring to fig. 1-6, fig. 11-14 and fig. 18, in an embodiment, the optical projection engine of the present invention includes a DMD optical modulator 30, a projection lens 40 and a beam splitter prism fixing assembly, wherein the DMD optical modulator 30 is installed at a rear installation opening 111b of the housing 10, and the projection lens 40 is installed at a front installation opening 111a of the housing 10.

The fixing component of the light splitting prism comprises a shell 10, a light splitting prism 20, an upper cover 50, a first elastic part 61, a second elastic part 62 and two third elastic parts 63, wherein the shell 10 is provided with an inner cavity 111, a front mounting hole 111a, a rear mounting hole 111b, an upper mounting hole 111c and a lower light inlet hole 111d which are communicated with the inner cavity 111, and a first side wall 112 and a second side wall 113 which are oppositely arranged in the left-right direction, and the inner cavity 111 is formed between the first side wall 112 and the second side wall 113;

a rear limiting surface 111e positioned at the periphery of the rear mounting port 111b is arranged in the inner cavity 111, a first boss 112a is arranged on the inner side surface of the first side wall 112, a second boss 113a is arranged on the inner side surface of the second side wall 113, a first convex strip 112b is respectively arranged on the opposite surfaces of the first boss 112a and the second boss 113a, the two first convex strips 112b are both adjacent to the lower light inlet 111d, each first convex strip 112b obliquely extends downwards from back to front, a side limiting surface 111f is formed on one surface, facing the second boss 113a, of the first boss 112a, and a lower limiting surface 111g is formed on the top surface of the first convex strip 112 b;

the beam splitter prism 20 is installed in the inner cavity 111 of the shell 10 through the upper installation opening 111c, and the upper cover 50 is fixedly covered on the upper installation opening 111 c; the beam splitter prism 20 includes an initial incident surface 211, an outgoing incident surface 212, and a first end surface 214 and a second end surface 215 which are arranged opposite to each other in the left-right direction, the first end surface 214 being arranged opposite to the first sidewall 112;

the first elastic piece 61 connects the second end surface 215 and the second boss 113a to make the first end surface 214 adhere to the side limiting surface 111 f; the second elastic piece 62 connects the upper end of the beam splitter prism 20 and the inner side surface of the upper cover 50 so that the initial incident surface 211 is attached to the lower limiting surface 111g and the emergent incident surface 212 is attached to the rear limiting surface 111 e; the two third elastic members 63 are respectively located in the front side spaces of the inner cavity 111 located on the first boss 112a and the second boss 113a, and the two third elastic members 63 are connected to the lower end of the beam splitter prism 20 and the housing 10 so that the exit and entrance surface 212 is attached to the rear limiting surface 111 e.

In this embodiment, the housing 10 is used to provide support for various components inside or outside the housing, and is a relatively complex component of the projection optical device. Specifically, referring to fig. 6 to 8, the projection light engine may further include a projection lens 40, an optical illumination system, and a reflector 90; the optical illumination system includes a light source (81a, 81b, 81c, 81d), a three-color modulation assembly including a collimating lens group (821a, 821b, 821c), a dichroic mirror (822a, 822b), a relay lens 823, and a fly-eye lens group 824, and a condensing lens group (83a, 83 b).

The housing 10 may be an integral structure or a separate structure, and specifically, may include a first housing 11 and a second housing 12, where the inner cavity 111, and a front mounting port 111a, a rear mounting port 111b, an upper mounting port 111c, and a lower light inlet port 111d communicating with the inner cavity 111 are formed in the first housing 11; or the main housing of the projector includes a housing 10 located at the upper portion and a second housing 12 located at the lower portion and connected to the first housing 11, where the housing 10 is only referred to as the first housing 11. The optical illumination system, the reflector 90 and the beam splitter prism 20 may be laid on the housing 10 along the same plane, and may be installed on the housing 10 along more than one plane, for example, the optical illumination system, the reflector 90 are installed to the second housing 12 along a horizontal plane, and the beam splitter prism 20 is installed to the first housing 11 from top to bottom along a vertical plane, so that the height of the whole projection light machine may be reduced and the effect of entering the illumination light path along the long side perpendicular to the DMD light modulator 30 may be achieved.

In the inner cavity 111 of the housing 10, the arrangement of the first bosses 112a and the first protruding strips 112b is beneficial to protruding the corresponding side limiting surfaces 111f and the lower limiting surfaces 111g out of the peripheral mechanism, so that the processing area of the high-precision plane is reduced, and the corresponding flatness is easily ensured. The second bosses 113a are provided to provide attachment points for the first elastic member 61 to facilitate installation of the first elastic member 61.

It should be understood that, referring to fig. 9 and 10, the beam splitter prism 20 may be a TIR (Total Internal Reflection) prism, an RTIR prism, or a single prism. Referring to fig. 3, 4, and 8 to 10, in an embodiment, the beam splitter prism 20 is matched with the DMD digital micromirror to convert the illumination light path into the projection light path under the action of the DMD light modulator 30. Specifically, the splitting prism 20 includes a near side prism 21 and a far side prism 22, the initial incident surface 211, the exit incident surface 212, the first end surface 214 and the second end surface 215 are all formed on the near side prism 21, and the near side prism 21 further includes a near side critical surface 213; the initial entrance face 211, the exit entrance face 212 and the proximal critical face 213 are all located between the first end face 214 and the second end face 215; the far-side prism 22 comprises a far-side critical surface 221 and an imaging emergent surface 222 facing the projection lens 40, and the top of the far-side prism 22 is provided with an emergent connecting surface 224 inclining backwards from top to bottom; the distal prism 22 further includes a third end face 225, a fourth end face 226, wherein the third end face 225 is flush with the first end face 214 and the fourth end face 226 is flush with the second end face 215; the distal critical surface 221 is glued to said proximal critical surface 213 with an air gap formed between them. In order to reduce the cost, the proximal prism 21 and the distal prism 22 are made of materials with the same refractive index, and the two prisms have the same shape, so that the molding dies can be shared. Initial incident surface 211 faces downward and abuts lower limit surface 111g, output connection surface 224 abuts on near-side boundary surface 213, the upper portion of near-side boundary surface 213 protrudes from output connection surface 224, and near-side boundary surface 213 and output connection surface 224 enclose recess 23 with an upward opening.

Referring to fig. 3, 4 and 6, the DMD light modulator 30 is used for controlling the on/off of the light beam according to the received image signal, thereby realizing image display. The projection lens 40 is used to enlarge and project the image modulated by the DMD light modulator 30 onto a screen. Referring again to fig. 3 and 6, the optical illumination system is used to generate parallel three-color light, which is not strictly parallel light but is a substantially parallel light beam with a certain angle error. The light sources (81a, 81b, 81c, 81d) of the optical illumination system are in particular LED light sources. In a variant embodiment of the optical illumination system, the light source may be an RGB laser, a mixed light laser, and a bulb type light source. The constitution of trichromatic modulation subassembly has multiple deformation according to prior art, if trichromatic modulation subassembly for example can arrange again and select for use dichroic mirror, colour wheel, fluorescence wheel and X prism etc. according to the difference of light source.

The light emitted by the light sources (81a, 81b, 81c, 81d) of the optical illumination system is parallel light output after being adjusted by the three-color modulation component, and the reflector 90 is used for changing the propagation direction of the parallel light. The optical illumination system further comprises a converging lens group (83a, 83b), the converging lens group (83a, 83b) being configured to convert the light beam having a substantially circular cross section into a light beam having a substantially rectangular cross section. In this embodiment, the parallel light transmitted through the fly eye lens is irradiated onto the reflecting mirror 90 after being processed by the lens on the lower side of the converging lens group (83a, 83b), and is further transmitted to the free-form surface lens on the upper side of the converging lens group (83a, 83b) with changing direction. The light converted by the converging lens groups (83a, 83b) is transmitted to the initial incident surface 211 of the beam splitting prism 20. The cross section of the beam splitter prism 20 is perpendicular to the initial incident surface 211, and when the beam splitter prism 20 is TIR (Total Internal Reflection) and is formed by gluing two prisms, the cross section of the beam splitter prism 20 is also perpendicular to the gluing surfaces of the two prisms.

The first elastic member 61, the second elastic member 62, and the third elastic member 63 may apply an elastic force to the prism 20 by compressing the first elastic member itself, or may apply an elastic force to the prism 20 by stretching the first elastic member itself. For example, the stretching direction of the second elastic member 62 is designed to be consistent with the front-back direction, and if the rear end of the second elastic member 62 is connected to the front side surface of the first boss 112a, the front end is connected to the first end surface 214 of the beam splitter prism 20, and the distance between the front end connection point and the rear end connection point of the second elastic member 62 is greater than the natural extension length of the second elastic member 62, the second elastic member 62 can apply a backward elastic force to the beam splitter prism 20. The third elastic member 63 may be directly connected to the lower end of the prism 20, or may be indirectly connected to the lower end of the prism 20 via a third member, as long as the elastic force can be reliably transmitted. In order for the second elastic member 62 to generate downward and rearward acting forces, the stretching or compressing direction of the second elastic member 62 may be inclined with respect to the up-down direction and the front-rear direction; and/or the second elastic member 62 is caused to act on a plane inclined with respect to the up-down direction and the front-rear direction.

The fixing component of the beam splitter prism is matched with the first elastic piece 61 through the side limiting surface 111f in the left and right directions to realize the limiting of the beam splitter prism 20; in the front-back direction, the lower end of the beam splitter prism 20 is limited by the third elastic member 63 and the rear limiting surface 111e, and the upper end of the beam splitter prism 20 is limited by the second elastic member 62 and the rear limiting surface 111 e; the beam splitter prism 20 is vertically retained by the second elastic member 62 engaging with the lower retaining surface 111 g. Thus, the limiting of the beam splitter prism 20 is realized in all three directions, wherein, firstly, the second elastic piece 62 is also used for limiting in two directions and is connected with the inner side surface of the upper cover 50, and the distance from the upper mounting opening 111c is short, so that the structure is compact and the assembly is easy; secondly, the third elastic element 63 is mounted to fully utilize the space behind the first boss 112a and the second boss 113a, so that the design purpose of compact structure can be achieved; further, the lower stopper surface 111g is formed on the first convex strip 112b having a narrow width, so that not only the occupied space is small, but also the processing is easy and the flatness of the lower stopper surface 111g is ensured. In summary, the fixing assembly of the splitting prism can realize the stable assembly of the splitting prism 20, high practicability and corresponding compact structure.

Further, referring to fig. 11 to 15 and fig. 18 again, in an embodiment, the inner side surface of the first sidewall 112 is further provided with a third boss 112c located in front of the first boss 112a and spaced from the first boss 112a, and the inner side surface of the second sidewall 113 is further provided with a fourth boss 113b located in front of the second boss 113a and spaced from the second boss 113 a; of the two third elastic members 63, one third elastic member 63 elastically abuts against the rear side surface of the third boss 112c and connects to the lower end of the prism 20, and the other third elastic member 63 elastically abuts against the rear side surface of the fourth boss 113b and connects to the lower end of the prism 20.

In this embodiment, the third boss 112c and the fourth boss 113b provide a backward supporting position for the two third elastic members 63, so that the two third elastic members 63 can apply backward elastic force to the lower end of the beam splitter prism 20 by utilizing their own compression; in addition, since the front side of the beam splitter prism 20 is usually provided with a light shielding plate for shielding Off light beams of the DMD light modulator 30 in a dark state, the temperature near the front mounting opening 111a is relatively high, so that the third boss 112c and the fourth boss 113b can shield a part of heat radiation for the corresponding third elastic member 63, and prevent the elastic change of the third elastic member 63 under excessive heat radiation from being too fast, such as aging.

Further, referring to fig. 9, 10 and 15 to 18, in an embodiment, the fixing assembly of the splitting prism further includes two bottom supporting members 70 fixedly connected to the first end surface 214 and the second end surface 215, respectively, one bottom supporting member 70 is located between the first boss 112a and the third boss 112c, and the other bottom supporting member 70 is located between the second boss 113a and the fourth boss 113 b;

both mounts 70 have forwardly facing support surfaces, one third resilient member 63 resiliently abuts between the rear side of the third boss 112c and the adjacent support surface of the mount 70, and the other third resilient member 63 resiliently abuts between the rear side of the fourth boss 113b and the adjacent support surface of the mount 70.

In this embodiment, during the assembly process, the third elastic member 63 is compressed and then inserted between the supporting surface of the base member 70 and the rear side surface of the corresponding third boss 112c or fourth boss 113 b. The bottom support member 70 can simplify the connection between the third elastic member 63 and the beam splitter prism 20 or reduce the manufacturing difficulty of the beam splitter prism 20, and meanwhile, the smooth transmission of the elastic force is ensured. For example, it is not necessary to directly bond the third elastic member 63 to the prism 20 or to integrally mold a lug for facilitating the connection of the third elastic member 63 to the prism 20.

Further, the bottom support 70 comprises side connecting plates 71 and a front baffle plate 72, the side connecting plates 71 of the two bottom support 70 are respectively attached and adhesively fixed on the first end surface 214 and the second end surface 215, the front baffle plate 72 is connected with one surface of the side connecting plate 71, which is far away from the beam splitter prism 20, and a supporting surface is formed on the front baffle plate 72.

In this embodiment, the side connecting plate 71 of the bottom support 70 is adhered to the end surface of the beam splitter prism 20, so that the assembly is facilitated, and a sufficient contact area is ensured to increase the resistance to the shear stress in the front-back direction. And through setting up preceding baffle 72 and supplying third elastic component 63 to butt, because preceding baffle 72 is little in the thickness of back and forth direction, consequently it is little in the space that its front and back direction occupy to more do benefit to from top to bottom to the position of design, for example the mount 70 is assembled to predetermined position from top to bottom along with beam splitter prism 20 after with beam splitter prism 20 bonding fixation.

Further, referring to fig. 11, 12 and 15, in an embodiment, a connection portion between the top surface of the first boss 112a and the front side surface of the first boss 112a is provided with a chamfered slope 112 d.

In this embodiment, when the bottom bracket 70 is tilted at a specific angle and touches the chamfer 112d during the assembly process of the splitting prism 20 from top to bottom, the chamfer 112d can perform a corresponding guiding function, i.e. guiding the relevant components to move to the correct position.

Further, referring to fig. 13 to 16, in an embodiment, a receiving groove 113c is disposed on a surface of the second boss 113a facing the first sidewall 112, and the receiving groove 113c extends in an up-down direction to intersect with a top surface of the second boss 113 a; the first elastic piece 61 is embedded in the receiving groove 113c and elastically abuts against the second end surface 215.

In this embodiment, by providing the receiving groove 113c for the first elastic member 61 to be installed, the first elastic member 61 can provide the beam splitter prism 20 with an elastic force toward the first sidewall 112 by self-compression, and the assembly is easier than applying an elastic force by self-tension. In addition, by utilizing the limiting function of the side wall surface of the accommodating groove 113c in the front-rear direction, the position of the first elastic member 61 in the front-rear direction is not deviated, and the first elastic member 61 is ensured to generate elastic force meeting the design requirement.

Further, referring to fig. 11 and 12 again, in an embodiment, a first process groove 112e is formed in a surface of the first boss 112a facing the second sidewall 113, the first process groove 112e extends along a vertical direction to intersect with a top surface of the first boss 112a, and side limiting surfaces 111f are formed on two sides of the first process groove 112e in a side view direction.

In this embodiment, the area of the side limiting surface 111f and the minimum size of each component of the side limiting surface 111f can be reduced by providing the first process groove 112e, which is further beneficial to ensuring the machining accuracy of the side limiting surface 111 f. In addition, the first process groove 112e extends in the vertical direction and penetrates upward, which is beneficial to the pattern drawing of the structural feature in the vertical direction. Since the first sidewall 112 has a certain thickness, the first bosses 112a are disposed to increase a local thickness of the case 10 in a thickness direction of the first sidewall 112, i.e., a left-right direction, for example, a distance from an outer side surface of the first sidewall 112 to a surface of the first boss 112a facing the second sidewall 113 is increased. Excessive thickness may cause shrinkage cavity defects in injection molding or die casting of the part, which may result in deformation of the associated surface. In order to reduce deformation of the important side stopper surface 111f caused during the manufacturing process, it is preferable that the top surface of the first boss 112a is centrally provided with a material reducing hole 112f extending in the up-down direction.

Further, referring to fig. 4 again, in an embodiment, the inner side surface of the upper cover 50 includes a rear inclined surface 51, the upper end of the beam splitter prism 20 is provided with a front abutting surface 213 opposite to the rear inclined surface 51, the rear inclined surface 51 and the front abutting surface 213 are both inclined downward from back to front, and the second elastic member 62 is elastically abutted between the rear inclined surface 51 and the front abutting surface 213.

In this embodiment, the second elastic member 62 is fitted between the rear inclined surface 51 and the front abutment surface 213 of the prism 20 by self-compression, so that the fitting is facilitated. Since the elastic force of the second elastic member 62 is substantially perpendicular to the front contact surface 213, the second elastic member 62 can generate backward and forward elastic forces, so that the beam splitter prism 20 can simultaneously abut against the lower limit surface 111g and the rear limit surface 111 e. The front contact surface 213 may be formed on a third member separate from the beam splitter prism 20, or may be formed directly on the beam splitter prism 20.

Further, referring to fig. 4 and fig. 8 to 10, in an embodiment, the light splitting prism 20 includes a near-side prism 21 and a far-side prism 22 glued to each other, the initial incident surface 211 and the exit incident surface 212 are formed on the near-side prism 21, the near-side prism 21 further includes a near-side critical surface 213 glued to the far-side prism 22, and the front abutment surface 213 is formed on a portion of the near-side critical surface 213 protruding upward out of the far-side prism 22.

In this embodiment, since the near-side critical surface 213 needs to totally reflect the illumination light beam to the DMD light modulator 30 located at the rear side, the position of the near-side critical surface 213 itself is tilted forward from top to bottom, so that the second elastic member 62 abuts on the near-side critical surface 213 to generate downward and backward elastic forces. The second elastic member 62 is abutted by directly using the near-side critical surface 213 of the splitting prism 20, so that the number of parts required for assembly is reduced, and the assembly efficiency is improved.

Further, the top of distal prism 22 has an exit connection surface 224 adjacent to proximal critical surface 213, exit connection surface 224 is inclined backward from top to bottom, and proximal critical surface 213 and exit connection surface 224 enclose a recess 23 with an upward opening;

the inner side surface of the upper cover 50 further includes a front inclined surface 52, the front inclined surface 52 and the rear inclined surface 51 both extend into the concave portion 23, the upper cover 50 is further provided with a dispensing hole 53 penetrating through the outer side surface of the upper cover 50 and the front inclined surface 52, the light splitting prism fixing assembly further includes an elastic glue (not shown), and the elastic glue flows through the dispensing hole 53 and is cured and bonded with the front inclined surface 52 and the emergent connection surface 224.

In this embodiment, the front inclined surface 52 and the rear inclined surface 51 extend into the concave portion 23, so that the vertical height of the structure can be reduced, and the structure is more compact. The application of a liquid, uncured elastomer between the front bevel 52 and the exit connection face 224 is facilitated by the dispensing aperture 53. Through setting up elastic glue bonding fixed preceding inclined plane 52 and the face 224 is connected to the outgoing, can prevent to rock around the horizontal axis that is on a parallel with the left and right sides direction, and then guarantee the projection stability of the projection ray apparatus that corresponds.

Further, referring to fig. 11 to 14 again, in an embodiment, a space is formed between the rear side surfaces of the first boss 112a and the second boss 113a and the rear wall surface of the inner cavity 111; the housing 10 further includes a first connecting portion 114 and a second connecting portion 115, the first connecting portion 114 connects the rear side of the first boss 112a and the rear wall of the cavity 111, and the second connecting portion 115 connects the rear side of the second boss 113a and the rear wall of the cavity 111; the two first protruding strips 112b extend backward to connect with the first connecting portion 114 and the second connecting portion 115, respectively.

In this embodiment, the first protruding strip 112b can extend backward by providing the first connecting portion 114 and the second connecting portion 115, and the strength of the first protruding strip is ensured. After the first protruding strip 112b extends backwards, the length of the corresponding lower limiting surface 111g in the front-back direction is correspondingly lengthened, so that the rear sides of the first boss 112a and the second boss 113a are hollowed out, which is beneficial to reducing the local wall thickness, and thus the precision of the machining and forming dimension is improved. The first connection portion 114 is connected to the first boss 112a, and the second connection portion 115 is connected to the second boss 113a, so that the strength of the first boss 112a and the second boss 113a can be increased correspondingly.

Further, the first connecting portion 114 is connected to a lower portion of the first boss 112a, a step structure 114a is disposed at a connection portion between a surface of the first connecting portion 114 facing the second side wall 113 and a top surface of the first connecting portion 114, a bottom surface of the step structure 114a is flush with the lower limiting surface 111g, and a vertical surface of the step structure 114a is closer to the first side wall 112 than the side limiting surface 111 f.

In this embodiment, the wall thickness of the local structure is reduced to a greater extent by providing the step structure 114a on the first boss 112a, but the structural reinforcement effect of the first connecting portion 114 is not weakened too much, and the bottom surface of the step structure 114a is arranged to be flush with the lower limiting surface 111g, so that the lower limiting surface 111g can be directly processed conveniently, or the processing of the mold surface corresponding to the lower limiting surface 111g can be facilitated.

Further, a second process groove 112g is formed in the lower limiting surface 111g close to the first boss 112a, the second process groove 112g includes a front-back extension section and a lateral extension section, the front-back extension section extends along an intersection line of the lower limiting surface 111g and the lateral limiting surface 111f, and the lateral extension section extends along an intersection line of the rear side surface of the first boss 112a and the bottom surface of the step structure 114 a.

In this embodiment, the second process groove 112g is provided to facilitate the processing of the lower limiting surface 111g, on one hand, because the area of the lower limiting surface 111g is reduced, and on the other hand, because the lower limiting surface 111g is easier to process when it is higher than the outer peripheral surface. In addition, since the first end surface 214 of the beam splitter prism 20 abuts against the side limiting surface 111f and the initial incident surface 211 abuts against the lower limiting surface 111g, the second process groove 112g can also play a role in avoiding the corner part at the connection between the first end surface 214 and the initial incident surface 211, so as to prevent the assembly interference.

Further, the second connection portion 115 extends in the vertical direction and is in a long shape, one surface of the second connection portion 115 facing the first sidewall 112 is flush with one surface of the second boss 113a facing the first sidewall 112, and a cavity is formed between one surface of the second connection portion 115 facing away from the first sidewall 112 and the second sidewall 113.

In this embodiment, first, the second connecting portion 115 is formed in a long strip shape, which is beneficial to fully ensure the reinforcing effect of the second connecting portion on the second boss 113 a; secondly, a cavity is formed between the second connecting portion 115 and the second side wall 113, so that the increase of the local wall thickness is avoided; furthermore, the second connecting portion 115 is flush with the second boss 113a on the side facing the first side wall 112, which is beneficial for forming.

Further, a fifth boss 116 is provided on the rear wall surface of the inner cavity 111, and in a rearward viewing angle, the fifth boss 116 is located on an upper side of the rear mounting opening 111 b; the fifth boss 116 is located between the left and right edges of the rear mounting opening 111b in a downward-looking perspective; a rear stopper surface 111e is formed on the front side surface of the fifth boss 116.

In this embodiment, the fifth boss 116 is provided to form the rear limiting surface 111e, which is beneficial to reducing the difficulty in machining and forming the rear limiting surface 111e by protruding the rear limiting surface 111e and reducing the area of the rear limiting surface 111 e; in addition, the fifth boss 116 does not completely block the rear mounting opening 111b in the up-down direction, so that, in the left-right direction, the fifth boss 116 and the first side wall 112 and the second side wall 113 respectively form a channel communicated with the front side space of the rear mounting opening 111b, so that a part of heat generated by the DMD optical modulator 30 can be diffused to the upper part of the inner cavity 111, thereby increasing the heat dissipation effect of the DMD optical modulator 30 on the one hand, and secondly, balancing the temperature of the air at the periphery of the beam splitter prism 20 to avoid deformation caused by temperature difference.

Further, a second rib 117 is further disposed on the rear wall surface of the inner cavity 111, and in a rearward viewing angle, the second rib 117 is located at a lower side of the rear mounting opening 111b, and the second rib 117 extends along a lower edge of the rear mounting opening 111 b; the rear stopper surface 111e is formed on the front side surface of the second protrusion 117.

In the present embodiment, the second convex strips 117 are provided to form the rear limiting surface 111e, so that the rear limiting surface 111e has a vertically dispersed characteristic, and the support of the exit and entrance surface 212 of the beam splitter prism 20 is more stable.

Referring to fig. 1-6, fig. 11 to 14 and fig. 18, in an embodiment, the optical projector includes a DMD optical modulator 30, a projection lens 40 and the above beam splitter prism fixing assembly, the DMD optical modulator 30 is installed in the rear installation opening 111b, and the projection lens 40 is installed in the front installation opening 111 a. The specific structure of the splitting prism fixing component refers to the above embodiments, and since the projection optical machine adopts all the technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not repeated here.

It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.

It will be understood that the embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the invention.

Claims

1. A fixing component for a beam splitter prism comprises a shell (10), a beam splitter prism (20), an upper cover (50), a first elastic piece (61), a second elastic piece (62) and two third elastic pieces (63),

the shell (10) is provided with an inner cavity (111), a front mounting port (111a), a rear mounting port (111b), an upper mounting port (111c) and a lower light inlet (111d) which are communicated with the inner cavity (111), and a first side wall (112) and a second side wall (113) which are oppositely arranged in the left-right direction, wherein the inner cavity (111) is formed between the first side wall (112) and the second side wall (113);

a rear limiting surface (111e) located on the periphery of the rear mounting port (111b) is arranged in the inner cavity (111), a first boss (112a) is arranged on the inner side surface of the first side wall (112), a second boss (113a) is arranged on the inner side surface of the second side wall (113), one opposite surface of each of the first boss (112a) and the second boss (113a) is provided with a first convex strip (112b), the two first convex strips (112b) are adjacent to the lower light inlet (111d), each first convex strip (112b) slants downwards and extends from back to front, one surface, facing the second boss (113a), of each first convex strip (112a) forms a side limiting surface (111f), and the top surface of each first convex strip (112b) forms a lower limiting surface (111 g);

the light splitting prism (20) is installed in the inner cavity (111) of the shell (10) through the upper installation opening (111c), and the upper cover (50) is fixedly covered on the upper installation opening (111 c); the beam splitting prism (20) comprises an initial incident surface (211), an emergent incident surface (212), a first end surface (214) and a second end surface (215), wherein the first end surface (214) and the second end surface are oppositely arranged in the left-right direction, and the first end surface (214) is oppositely arranged with the first side wall (112);

the first elastic piece (61) is connected with the second end surface (215) and the second boss (113a) so that the first end surface (214) is attached to the side limiting surface (111 f); the second elastic piece (62) is used for connecting the upper end of the beam splitter prism (20) and the inner side surface of the upper cover (50) so that the initial incidence surface (211) is attached to the lower limiting surface (111g) and the emergent incidence surface (212) is attached to the rear limiting surface (111 e); the two third elastic pieces (63) are respectively positioned in the front side spaces of the inner cavity (111) and positioned on the first boss (112a) and the second boss (113a), and the two third elastic pieces (63) are connected with the lower end of the beam splitter prism (20) and the shell (10) so that the emergent and incident surface (212) is attached to the rear limiting surface (111 e).

2. The fixing assembly of claim 1, wherein the inner side surface of the first sidewall (112) is further provided with a third boss (112c) spaced apart from the first boss (112a) at the front side of the first boss (112a), and the inner side surface of the second sidewall (113) is further provided with a fourth boss (113b) spaced apart from the second boss (113a) at the front side of the second boss (113 a); of the two third elastic members (63), one third elastic member (63) elastically abuts against the rear side surface of the third boss (112c) and is connected to the lower end of the beam splitter prism (20), and the other third elastic member (63) elastically abuts against the rear side surface of the fourth boss (113b) and is connected to the lower end of the beam splitter prism (20).

3. The beam splitting prism holder assembly of claim 2,

the fixing component of the light splitting prism further comprises two bottom support pieces (70) fixedly connected with the first end face (214) and the second end face (215), one bottom support piece (70) is positioned between the first boss (112a) and the third boss (112c), and the other bottom support piece (70) is positioned between the second boss (113a) and the fourth boss (113 b);

the two bases (70) are respectively provided with a support surface facing forwards, one third elastic piece (63) is elastically abutted between the rear side surface of the third boss (112c) and the adjacent support surface of the base (70), and the other third elastic piece (63) is elastically abutted between the rear side surface of the fourth boss (113b) and the adjacent support surface of the base (70).

4. The fixing assembly of claim 3, wherein the base member (70) comprises a side connecting plate (71) and a front baffle plate (72), the side connecting plates (71) of the two base members (70) are respectively attached and bonded to the first end surface (214) and the second end surface (215), the front baffle plate (72) is connected with a surface of the side connecting plate (71) facing away from the beam splitter prism (20), and the supporting surface is formed on the front baffle plate (72).

5. The fixing assembly of any one of claims 2 to 4, wherein a junction of the top surface of the first boss (112a) and the front side surface of the first boss (112a) is provided with a chamfered slope (112 d).

6. The fixing assembly of any one of claims 1 to 4, wherein a face of the second boss (113a) facing the first sidewall (112) is provided with a receiving groove (113c), and the receiving groove (113c) extends in an up-down direction to intersect with a top face of the second boss (113 a); the first elastic piece (61) is embedded in the accommodating groove (113c) and elastically abuts against the second end face (215).

7. The prism fixing assembly of claim 6, wherein a surface of the first boss (112a) facing the second sidewall (113) is provided with a first process groove (112e), the first process groove (112e) extends in an up-down direction to intersect with a top surface of the first boss (112a), and the side limiting surfaces (111f) are formed at both sides of the first process groove (112e) in a side view direction.

8. The fixing unit of claim 7, wherein the top surface of the first boss (112a) is centrally provided with a material reducing hole (112f) extending in the up-down direction.

9. The fixing assembly of claim 1, wherein the inner side surface of the upper cover (50) comprises a rear inclined surface (51), the upper end of the beam splitter prism (20) is provided with a front abutment surface (213) opposite to the rear inclined surface (51), the rear inclined surface (51) and the front abutment surface (213) are both arranged to be inclined downward from back to front, and the second elastic member (62) is elastically abutted between the rear inclined surface (51) and the front abutment surface (213).

10. The fixing assembly of claim 9, wherein the splitting prism (20) comprises a near side prism (21) and a far side prism (22) glued to each other, the initial incident surface (211) and the exit incident surface (212) are formed on the near side prism (21), the near side prism (21) further comprises a near side critical surface (213) glued to the far side prism (22), and the front abutment surface (213) is formed on the near side critical surface (213) at a position protruding upward from the far side prism (22).

11. The beam splitting prism holder assembly of claim 10,

the top of the far-side prism (22) is provided with an exit connecting surface (224) adjacent to the near-side critical surface (213), the exit connecting surface (224) slants backwards from top to bottom, and the near-side critical surface (213) and the exit connecting surface (224) enclose a concave part (23) with an upward opening;

the inner side surface of the upper cover (50) further comprises a front inclined surface (52), the front inclined surface (52) and the rear inclined surface (51) extend into the concave part (23), the upper cover (50) is further provided with a glue dispensing hole (53) which penetrates through the outer side surface of the upper cover (50) and the front inclined surface (52), the light splitting prism fixing assembly further comprises elastic glue, and the elastic glue flows through the glue dispensing hole (53) and is solidified and bonded with the front inclined surface (52) and the emergent connecting surface (224).

12. The fixing assembly of any one of claims 1 and 9 to 11, wherein a space is formed between the rear side surfaces of the first boss (112a) and the second boss (113a) and the rear wall surface of the inner cavity (111); the shell (10) further comprises a first connecting portion (114) and a second connecting portion (115), the first connecting portion (114) is connected with the rear side surface of the first boss (112a) and the rear wall surface of the inner cavity (111), and the second connecting portion (115) is connected with the rear side surface of the second boss (113a) and the rear wall surface of the inner cavity (111); the two first convex strips (112b) extend backwards to be respectively connected with the first connecting part (114) and the second connecting part (115).

13. The fixing assembly of claim 12, wherein the first connecting portion (114) is connected to a lower portion of the first boss (112a), a step structure (114a) is provided at a connection between a surface of the first connecting portion (114) facing the second side wall (113) and a top surface of the first connecting portion (114), a bottom surface of the step structure (114a) is flush with the lower limiting surface (111g), and a vertical surface of the step structure (114a) is closer to the first side wall (112) than the side limiting surface (111 f).

14. The prism holder as claimed in claim 13, wherein a second groove (112g) is formed on the lower limiting surface (111g) adjacent to the first boss (112a), the second groove (112g) includes a front-rear extension extending along an intersection of the lower limiting surface (111g) and the side limiting surface (111f), and a lateral extension extending along an intersection of the rear side surface of the first boss (112a) and the bottom surface of the step structure (114 a).

15. The fixing assembly of claim 12, wherein the second connecting portion (115) extends in an elongated shape in a vertical direction, a surface of the second connecting portion (115) facing the first sidewall (112) is flush with a surface of the second projection (113a) facing the first sidewall (112), and a cavity is formed between a surface of the second connecting portion (115) facing away from the first sidewall (112) and the second sidewall (113).

16. The fixing assembly of any one of claims 1 and 9 to 11, wherein a fifth boss (116) is provided on a rear wall surface of the inner cavity (111), the fifth boss (116) being located on an upper side of the rear mounting opening (111b) in a rearward viewing angle; the fifth boss (116) is located between left and right edges of the rear mounting opening (111b) in a downward-looking perspective; the rear stopper surface (111e) is formed on a front side surface of the fifth boss (116).

17. The fixing assembly of claim 16, wherein the rear wall surface of the inner cavity (111) is further provided with a second rib (117), the second rib (117) is located at a lower side of the rear mounting opening (111b) in a rearward viewing angle, and the second rib (117) extends along a lower edge of the rear mounting opening (111 b); the rear stopper surface (111e) is formed on a front side surface of the second protrusion (117).

18. A projection light machine, comprising a DMD light modulator (30), a projection lens (40) and the beam splitting prism fixing assembly of any one of claims 1 to 17, wherein the DMD light modulator (30) is installed at the rear installation opening (111b), and the projection lens (40) is installed at the front installation opening (111 a).