CN214375773U - Optical machine assembly and projection optical machine - Google Patents

Abstract

The utility model discloses an optical-mechanical component and a projection optical-mechanical, the optical-mechanical component comprises a shell, a beam splitter prism, a gland and a shading heat-radiating component, the shell is provided with an inner cavity, a first side wall and a second side wall which are opposite to each other left and right, a front mounting port, a rear mounting port and an upper mounting port; the first side wall is provided with a penetrating groove which is adjacent to the front mounting opening and is communicated with the inner cavity; the upper end of the first side wall and/or the second side wall is/are provided with a fixing structure, and the fixing structure is provided with an upward supporting surface; the beam splitter prism is arranged in the inner cavity and comprises an initial incidence surface, an emergent incidence surface and an imaging emergent surface, the intersection line of the initial incidence surface and the emergent incidence surface is parallel to the left-right direction, and the gland cover covers the upper mounting opening; the shading and radiating assembly comprises a shading piece and a radiating piece connected with the outer end of the shading piece, and the shading piece extends into the inner cavity through the penetrating groove; the light shielding piece is at least arranged opposite to the imaging emergent surface, and the heat dissipation piece comprises a plurality of heat dissipation fins. The utility model discloses a ray apparatus subassembly upper and lower direction compact structure, the radiating piece can fully dispel the heat.

Description

Optical machine assembly and projection optical machine

Technical Field

The utility model relates to an optical projection equipment technical field especially relates to an ray apparatus subassembly and projection ray apparatus.

Background

The core component of the micro projector is a projector, and the existing projector usually applies a DMD light modulator for realizing the projection of a rectangular wide screen picture, i.e. it receives an illumination beam incident perpendicular to the short side of the rectangular modulation area of the DMD light modulator. There is also a DMD optical modulator that has a rectangular modulation region with a long side as the incident side of the illumination beam.

According to the working principle of the projection light machine, when the DMD light modulators are in the dark state (Off state), the Off light heat dissipation structure configured in the projection light machine can shield Off the Off light beams and conduct heat generated by the Off light beams to the external environment. The Off light heat dissipation structure generally comprises a light shielding part and a heat dissipation part, wherein the light shielding part is arranged in the projection light machine and is positioned between a lens and a light splitting prism; the heat dissipation part links to each other with shading part and sets up the surface at the projection ray apparatus, and shading part is used for directly sheltering from the Off light and will shelter from the heat conduction that the Off light produced to the heat dissipation part, and the heat dissipation part then is used for further conducting the heat of receiving to external environment in order to realize radiating function.

Since the splitting prism used with the DMD light modulator usually has such a feature: assuming that the maximum dimension of the beam splitter prism in the direction parallel to the non-incident side of the rectangular modulation region is L1 and the maximum dimension of the beam splitter prism in the direction parallel to the incident side of the rectangular modulation region is L2, L1>1.5L 2. Then, according to the above-mentioned second type DMD light modulator collocated with such a splitting prism, and when the extending direction of the non-incident surface side of the rectangular modulation region is consistent with the up-down direction, it is difficult to balance between saving the installation space in the up-down direction and sufficient heat dissipation according to the existing projector light machine assembling structure, that is, the installation space in the up-down direction can be saved, and sufficient heat dissipation can be satisfied.

SUMMERY OF THE UTILITY MODEL

Based on the above-mentioned current situation, the utility model discloses a main aim at provides one kind both can save about the direction installation space from this increase low reaches product practicality, can satisfy Off light again and shelter from abundant radiating ray apparatus subassembly and projection ray apparatus.

In order to achieve the above object, the utility model adopts the following technical scheme:

an optical machine assembly comprises a shell, a beam splitter prism, a gland and a shading and heat radiating assembly, wherein the shell is provided with an inner cavity, a first side wall and a second side wall which are oppositely arranged in the left-right direction, a front mounting port and a rear mounting port which are oppositely arranged in the front-rear direction, and an upper mounting port which is positioned at the upper part; the inner cavity is formed between the first side wall and the second side wall, and the front mounting port, the rear mounting port and the upper mounting port are communicated with the inner cavity;

a penetrating groove communicated with the inner cavity is formed in the position, adjacent to the front mounting opening, of the first side wall; the upper end of the first side wall and/or the second side wall is/are provided with a fixing structure, and the fixing structure is provided with an upward supporting surface;

the beam splitter prism penetrates through the upper mounting opening and is mounted in the inner cavity, the beam splitter prism comprises an initial incident surface, an emergent incident surface facing the rear mounting opening and an imaging emergent surface facing the front mounting opening, the intersection line of the initial incident surface and the emergent incident surface is parallel to the left-right direction, and the gland covers the upper mounting opening;

the shading and radiating assembly comprises a shading piece and a radiating piece, the shading piece penetrates through the penetrating groove and extends into the inner cavity, and the outer end of the shading piece is connected with the radiating piece; the light shielding piece is at least arranged opposite to the part of the imaging emergent surface far away from the initial incident surface, and the heat dissipation piece comprises a plurality of heat dissipation fins.

Preferably, the heat dissipation element further comprises an inner connecting plate and an outer cover plate, the inner connecting plate penetrates through the penetrating groove and extends into the inner cavity, and the inner connecting plate is fixedly attached to the light shading element;

the outer cover plate is connected with the outer end of the inner connecting plate and covers the penetrating groove; the radiating fins are arranged on the outer side surface of the outer cover plate;

each radiating fin extends along the vertical direction and the horizontal direction; the plurality of radiating fins are divided into a middle radiating fin group, a front radiating fin group positioned on the front side of the middle radiating fin group and a rear radiating fin group positioned on the rear side of the middle radiating fin group;

in the front-rear direction, the middle radiating fin group is closer to the inner connecting plate of the radiating piece than the front radiating fin group and the rear radiating fin group; in the up-down direction, the length of the middle radiating fin group is larger than the lengths of the front radiating fin group and the rear radiating fin group.

Preferably, a fixing structure is arranged at the upper end of the first side wall, and the fixing structure is formed by extending from the outer side surface of the first side wall to the direction far away from the second side wall;

the bottom surface of the fixed structure is provided with a heat dissipation channel, the heat dissipation channel is intersected with the side surface, far away from the second side wall, of the fixed structure, the heat dissipation channel is adjacent to the heat dissipation fins, and at least part of the heat dissipation fins extend into the heat dissipation channel.

Preferably, the upper end of the middle fin group extends into the heat dissipation channel, and the upper end of the middle fin group is higher than the upper ends of the front fin group and the rear fin group.

Preferably, the outer cover plate further comprises a plurality of hollow parts, the hollow parts are positioned at the upper end or the lower end of the rear radiating fin group and the upper end or the lower end of the front radiating fin group, the plurality of hollow parts correspond to the edge part of the penetrating groove, and each hollow part is provided with a through hole; the edge part of the penetrating groove is provided with a fixing hole corresponding to the through hole; the shading and heat-dissipating assembly further comprises a fastener, and the fastener is matched with the through hole and the fixing hole to fix the outer cover plate to the outer side face of the shell.

Preferably, the edge portion of the outer cover plate corresponding to the penetrating groove is provided with a positioning hole, the edge portion of the penetrating groove corresponding to the positioning hole is provided with a positioning column, and the positioning column is in positioning fit with the positioning hole.

Preferably, the positioning hole is a blind hole formed in the inner side surface of the outer cover plate, the shading and heat dissipating assembly further comprises a sealing ring, an annular concave portion surrounding the penetrating groove is formed in the edge portion of the penetrating groove, the sealing ring is adhered and embedded in the annular concave portion and is in press fit with the outer cover plate, and the inner connecting plate and the shading piece penetrate through the sealing ring sleeve and extend into the inner cavity.

Preferably, the rear side surface of the inner joint plate is fixedly attached to the shading piece, and the length of the front radiating fin group is greater than that of the rear radiating fin group in the vertical direction.

Preferably, 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 at a position adjacent to the front mounting opening, and a socket is arranged on the second boss and penetrates through the top surface of the second boss and one surface facing the first side wall; the inserting port is arranged opposite to the penetrating groove in the left-right direction, and the inner end of the shading piece is inserted into the inserting port;

the beam splitting prism also comprises a first end surface and a second end surface which are oppositely arranged in the left-right direction; the first end face is opposite to the first side wall, a first clamping cavity is formed between the first end face and the first side wall, and a second clamping cavity is formed between the second end face and the second side wall; the second boss is positioned at the bottom of the second clamping cavity; the second boss is positioned at the bottom of the first clamping cavity and at the rear side of the shading piece;

the optical-mechanical assembly further comprises two first elastic pieces which are respectively positioned at the bottoms of the first clamping cavity and the second clamping cavity, and the inner cavity further comprises a rear limiting surface positioned on the periphery of the rear mounting port; in the second clamping cavity, the first elastic piece is elastically connected with the second boss and the second end face so that the beam splitter prism abuts against the rear limiting face; the first elastic piece is elastically connected with the first boss and the first end face in the first clamping cavity so that the beam splitter prism abuts against the rear limiting face;

the first side wall and the second side wall are respectively provided with through holes corresponding to the two first elastic pieces, and the two first elastic pieces penetrate through the through holes and are installed at the bottom of the inner cavity; the outer cover plate corresponds to the through hole in the first side wall and is provided with a clearance gap, the lower end of the rear radiating fin group is flush with the upper edge of the clearance gap, and the middle radiating fin group is flush with the front edge of the clearance gap.

Preferably, the optical-mechanical assembly further comprises two bottom supports respectively located at the bottoms of the first clamping cavity and the second clamping cavity, each bottom support comprises a side connecting plate and a front baffle, the side connecting plates of the two bottom supports are respectively attached and adhesively fixed to the first end face and the second end face, and the front baffle is connected with one face, away from the beam splitting prism, of the side connecting plate;

in the second clamping cavity, the first elastic piece is elastically abutted against the rear side face of the second boss and the front plate face of the front baffle plate so that the beam splitter prism is abutted against the rear limiting face; in the first clamping cavity, the first elastic piece is elastically abutted against the rear side face of the first boss and the front plate face of the front baffle so that the beam splitter prism is abutted against the rear limiting face.

Preferably, an insertion port is formed in the position, adjacent to the front mounting port, of the inner side face of the second side wall, the insertion port is arranged opposite to the penetrating groove in the left-right direction, and the inner end of the shading piece is inserted into the insertion port.

Preferably, the bottom wall surface of the inner cavity is provided with lower limiting surfaces at positions adjacent to the left wall surface and the right wall surface, and the rear wall surface of the inner cavity comprises a rear limiting surface positioned at the periphery of the rear mounting opening;

the beam splitting prism comprises a near side prism and a far side prism which are mutually glued, the initial incidence plane, a near side critical plane and an emergent incidence plane are formed on the near side prism, and the near side prism also comprises a near side critical plane; the far-side prism is glued with the near-side critical surface and is arranged far away from the rear mounting opening, and the top of the far-side prism is provided with an emergent connecting surface inclined backwards from top to bottom;

the initial incident surface faces downwards and is attached to the lower limiting surface, the near side critical surface faces away from the rear mounting opening and is glued with the far side prism, and the emergent incident surface faces towards the rear mounting opening and is attached to the rear limiting surface;

the emergent connection surface is adjacent to the near-side critical surface, the upper part of the near-side critical surface protrudes out of the emergent connection surface, and the near-side critical surface and the emergent connection surface enclose to form a concave part with an upward opening;

the optical machine component further comprises a second elastic piece, the inner surface of the gland comprises a rear inclined surface extending into the concave portion, the rear inclined surface is opposite to the near-side critical surface, and the second elastic piece is elastically abutted between the rear inclined surface and the near-side critical surface.

Preferably, the gland includes base plate and backplate, the base plate lid closes go up the installing port, the backplate is followed the inboard face downwardly extending of base plate forms and is stretched into the concave part, the back inclined plane is formed on the backplate.

The utility model also provides a projection optical machine, including DMD light modulator, projection lens and as above-mentioned optical machine subassembly, the DMD light modulator is installed in the back installing port, the light modulation region of DMD light modulator sets up forward; the projection lens is installed at the front installation opening.

The utility model discloses an at first through radiator unit about the edge direction assemble to the casing, the radiator expose in casing about ascending one side of side, so avoided taking this by spectral prism extruded assembly space under the considerable degree in upper and lower direction for the size of direction is less relatively about the part of low reaches product is connected with fixed knot structure. Secondly, set up the multi-disc fin through the radiating piece and thus even under the limited circumstances of the lateral installation space of the side of perpendicular to left and right sides direction, the sufficient heat radiating area also can be guaranteed to the radiating piece to it is easier to expand heat radiating area to compare directly set up flat heat radiation structure at the top of casing, thereby guarantees sufficient heat-sinking capability. Moreover, because the beam splitter prism passes through the upper mounting port from top to bottom and is installed to the inner cavity, the gland covers the upper mounting port and is perpendicular to the main assembling direction of the shading heat-radiating assembly, the assembly of the beam splitter prism and the gland is relatively independent to the assembly of the shading heat-radiating assembly, and more flexibility is brought to the assembly of the optical-mechanical assembly. To sum up, the utility model discloses an ray apparatus subassembly has saved the installation space of holding surface or gland upside, and thereby the radiating piece can guarantee sufficient heat radiating area and fully dispel the heat to assemble more in a flexible way on the whole.

Other advantages of the present invention will be described in the detailed description, and those skilled in the art can understand the technical advantages brought by the technical features and technical solutions through the descriptions of the technical features and the technical solutions.

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 diagram of the DMD light modulator, beam splitter prism, and light blocking member of FIG. 3, illustrating dark state beam positions;

FIG. 8 is a partial structural diagram of the optical projector of FIG. 1 on the upper portion of the housing;

FIG. 9 is an exploded view of the structure of FIG. 8;

FIG. 10 is an enlarged view of a portion of the structure shown at B in FIG. 9;

FIG. 11 is a schematic cross-sectional view taken along line XI-XI in FIG. 8;

FIG. 12 is an enlarged partial view of the structure at C in FIG. 11;

FIG. 13 is a schematic view of an exploded view of the structure of FIG. 8 from another angle;

FIG. 14 is an enlarged partial schematic view of FIG. 13 at D;

fig. 15 is an exploded view of the heat sink assembly of fig. 13;

FIG. 16 is a schematic view of the mating arrangement of the beam splitter prism and the mounting assembly of FIG. 9;

FIG. 17 is a schematic view of the structure of FIG. 16 from another angle;

FIG. 18 is a schematic diagram of the structure of FIG. 8 with the upper cover, the base assembly, the DMD light modulator, etc., removed;

FIG. 19 is a schematic top view of the structure of FIG. 8 with the upper cover, DMD light modulator, etc. removed;

FIG. 20 is a schematic cross-sectional view taken along line XX-XX in FIG. 19;

fig. 21 is a schematic sectional view taken along line XXI-XXI in fig. 19.

The reference numbers illustrate:

Detailed Description

Referring to fig. 1 to 4, 7 and 14, in an embodiment, the optical-mechanical assembly of the present invention includes a housing 10, a beam splitter prism 20, a press cover 51 and a light-shielding and heat-dissipating assembly 60, the housing 10 has an inner cavity 111, a first side wall and a second side wall oppositely disposed in a left-right direction, a front mounting opening 112 and a rear mounting opening 113 oppositely disposed in a front-rear direction, and an upper mounting opening 114 located at an upper portion; an inner cavity 111 is formed between the first side wall and the second side wall, and the front mounting port 112, the rear mounting port 113 and the upper mounting port 114 are communicated with the inner cavity 111;

the first side wall is provided with a penetrating groove 115 communicated with the inner cavity 111 at a position adjacent to the front mounting opening 112; the upper end of the first side wall and/or the second side wall is provided with a fixing structure 116, and the fixing structure 116 is provided with an upward supporting surface 116 a;

the beam splitter prism 20 is installed in the inner cavity 111 through the upper installation port 114, the beam splitter prism 20 comprises an initial incident surface 211, an emergent incident surface 212 facing the rear installation port 113 and an imaging emergent surface 222 facing the front installation port 112, the intersection line of the initial incident surface 211 and the emergent incident surface 212 is parallel to the left-right direction, and the gland 51 covers the upper installation port 114;

the shading and heat dissipating assembly 60 comprises a shading piece 61 and a heat dissipating piece 62, the shading piece 61 passes through the penetrating groove 115 and extends into the inner cavity 111, and the outer end of the shading piece 61 is connected with the heat dissipating piece 62; the light blocking member 61 is disposed opposite to at least a portion of the imaging exit surface 222 away from the initial entrance surface 211, and the heat dissipation member 62 includes a plurality of heat dissipation fins 621.

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. The main function of the front mounting opening 112 and the rear mounting opening 113 is to allow the light beam to pass therethrough. The penetrating slot 115 is mainly used for the light shielding member 61 to penetrate through, but in practical applications, in order to primarily limit or guide the light shielding member 61 to facilitate the rapid assembly of the light shielding member 61, the size of the penetrating slot 115 is the same as that of the portion of the light shielding and heat dissipating assembly 60 located in the penetrating slot 115, and the fit relationship between the penetrating slot 115 and the light shielding and heat dissipating assembly is clearance fit. The fixing structure 116 is used for fixedly connecting with a component of a downstream product, such as a circuit board of a projector, and for facilitating fixing and supporting, as shown in the figure, one fixing structure 116 is disposed on each of the first side wall and the second side wall, and an embedded copper nut is disposed on the fixing structure 116. The support surface 116a on the fixed structure 116 is then used to position the components of the downstream product concerned, for example the circuit board of the projector mentioned above, in an up-and-down direction.

Referring to fig. 1 to 3, 5, 6, and 8, the housing 10 may be an integral structure or a separate structure, and specifically, the housing 10 may include an inner cavity 111 formed by the first housing 11 and the second housing 12, and a front mounting port 112 and a rear mounting port 113 communicated with the inner cavity 111, which are formed on the first housing 11. In the optical projection engine, the optical illumination system, the reflector 90 and the beam splitter prism 20 of the optical projection engine may be laid on the housing 10 along the same plane, or may be mounted on the housing 10 along more than one plane, for example, referring to fig. 3 to 6 again, the optical projection engine may further include the optical illumination system and the 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 optical illumination system and the reflector 90 are mounted to the second housing 12 along a horizontal plane, and the beam splitter prism 20 is mounted to the first housing 11 from top to bottom along a vertical plane, so that the overall height of the projector can be reduced and the effect of incident illumination light path along a long side perpendicular to the DMD light modulator 30 can be achieved. The bottom wall surface of the cavity 111 is formed with lower limiting surfaces 111h (not labeled) at positions adjacent to the left and right wall surfaces, and the bottom surface of the beam splitter prism 20 abuts against the lower limiting surfaces 111 h.

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.

Referring to fig. 4 and 9, regarding the installation of the splitting prism 20, the top of the housing 10 may be provided with an installation opening 114 to facilitate the installation of the splitting prism 20 to the inner cavity 111, or other parts of the housing 10, such as the left side wall or the right side wall, may be provided with an installation opening for the installation of the splitting prism 20 to the inner cavity 111. It is understood that the beam splitting prism 20 can 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, referring to fig. 7, 16 and 17, the splitting prism 20 includes a near-side prism 21 and a far-side prism 22, the initial incident surface 211, the emergent 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 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 is glued to the proximal critical surface 213 with an air gap formed between them. The intersection of the initial incident surface 211 and the exit incident surface 212 is parallel to the left-right direction, and the illumination light beam enters the light modulation region from the long side of the light modulation region of the DMD light modulator 30. 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 111h, 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. 4 and 7 again, when the DMD optical modulator 30 is applied to the projection optical engine, the DMD optical modulator 30 is installed in the rear installation opening 113, and the light modulation area of the DMD optical modulator 30 is disposed forward; the projection lens 40 of the projection light machine is installed at the front installation opening 112. The DMD light modulator 30 is used to control 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 to fig. 3 and 6 again, the optical illumination system is used to generate parallel three-color light beams, which are not strictly parallel light beams, but are substantially parallel light beams allowing 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.

Referring to fig. 7 to 15, the light shielding member 61 is used for shielding the Off beam and determining the boundary between the bright state beam and other stray light. The light shielding member 61 is further provided in a flat plate shape in order to reduce the occupation of space in the front-rear direction. The heat sink 62 is used for receiving the heat conducted by the light shielding member 61 and further exchanging the heat to the external environment, such as air or a liquid heat-conducting medium.

The utility model discloses an at first through radiator unit about the edge direction assemble to casing 10, radiator 62 exposes in casing 10 about ascending one side of side, so avoided taking this by the extruded assembly space of beam splitter prism 20 under the considerable degree in upper and lower direction for the part of low reaches product is connected the size of back upper and lower direction less relatively with fixed knot constructs 116. Secondly, a plurality of fins are provided through the heat sink 62 so that the heat sink 62 can secure a sufficient heat dissipation area even in a case where a lateral installation space of a side surface perpendicular to the left-right direction is limited, and it is easier to expand the heat dissipation area than a case where a flat-plate-shaped heat dissipation structure is directly provided at the top of the case 10, thereby securing a sufficient heat dissipation capability. Moreover, since the beam splitter prism 20 passes through the upper mounting port 114 from top to bottom and is mounted to the inner cavity 111, and the pressing cover 51 covers the upper mounting port 114 and is perpendicular to the main mounting direction of the light-shielding heat dissipation assembly 60, the assembly of the beam splitter prism 20 and the pressing cover 51 is relatively independent from the assembly of the light-shielding heat dissipation assembly 60, thereby providing more flexibility for the assembly of the optical-mechanical assembly. To sum up, the utility model discloses an optical-mechanical component has saved the installation space of holding surface 116a or gland 51 upside, and thereby radiating piece 62 can guarantee sufficient heat radiating area fully dispels the heat to assemble more in a flexible way on the whole.

Further, referring to fig. 1, 8, 9, 11 to 13, 15 and 18 to 20, in an embodiment, the heat dissipating member 62 further includes an inner connecting plate 622 and an outer cover plate 623, the inner connecting plate 622 passes through the through slot 115 and extends into the inner cavity 111, and the inner connecting plate 622 is attached and fixed to the light shielding member 61; the outer cover plate 623 is connected with the outer end of the inner connecting plate 622 and covers the penetrating groove 115; the heat dissipation fins 621 are arranged on the outer side surface of the outer cover plate 623;

each of the heat dissipating fins 621 extends in the up-down direction and the left-right direction; the plurality of fins 621 are divided into a middle fin group 621a, a front fin group 621b located at the front side of middle fin group 621a, and a rear fin group 621c located at the rear side of middle fin group 621 a;

in the front-rear direction, middle fin group 621a is closer to heat sink 62 than front fin group 621b and rear fin group 621 c; in the vertical direction, the length of middle fin group 621a is greater than the lengths of front fin group 621b and rear fin group 621 c.

In this embodiment, the connection between the heat dissipating fins 621 and the light shielding member 61 can be simplified by providing the internal connection plate 622, and it is ensured that heat is quickly transferred to each heat dissipating fin 621. The plurality of heat dissipation fins 621 are divided into a plurality of fin groups according to the lengths in the vertical direction, and the length of the middle fin group 621a closest to the heat dissipation member 62 is set to be longest, so that the heat dissipation fin 621 having the shortest heat transfer path obtains a larger heat dissipation area under the condition that the assembly space is relatively limited, and a better heat dissipation effect can be achieved. It is understood that the lengths of the fins 621 may be the same or different in each fin group. In the case where the lengths of the fins 621 in each fin group are different, the length of the middle fin group 621a being greater than that of the front fin group 621b means that the length of the fin 621 with the shortest length in the middle fin group 621a is greater than that of the fin 621 with the longest length in the front fin group 621 b. The meaning that the length of middle fin group 621a is greater than the length of rear fin group 621c can be compared with the length of middle fin group 621a and front fin group 621 b.

Further, referring to fig. 1, 8, 9, 13 and 18, in an embodiment, a fixing structure 116 is disposed at an upper end of the first sidewall, and the fixing structure 116 is formed by extending from an outer side surface of the first sidewall to a direction away from the second sidewall;

the bottom surface of the fixing structure 116 is provided with a heat dissipation channel 116b, the heat dissipation channel 116b intersects with the side surface of the fixing structure 116 far away from the second side wall, the heat dissipation channel 116b is disposed adjacent to the heat dissipation fins 621, and at least a part of the heat dissipation fins 621 extends into the heat dissipation channel 116 b.

In this embodiment, the fixing structure 116 extends from the second sidewall to form an enlarged mounting area of the top surface of the housing 10 and correspondingly expands the assembly space. And in order to fully utilize the space outside the first sidewall, the fixing structure 116 and the heat sink 62 are disposed adjacent to each other in the up-down direction, in this case, since the fixing structure 116 extends outward to form a shield above the heat sink 62, the heat dissipation condition of the heat sink 62 is reduced to some extent, but the adverse effect on the heat dissipation condition can be reduced by disposing the heat dissipation channel 116b on the bottom surface of the fixing structure 116 and extending part of the heat dissipation fins 621 into the heat dissipation channel 116 b. The part of the heat dissipation fins 621 extending into the heat dissipation channel 116b may be all of the middle heat dissipation fin group 621a, the front heat dissipation fin group 621b, or the rear heat dissipation fin group 621c, or a part of the heat dissipation fins 621 in the middle heat dissipation fin group 621a and the front heat dissipation fin group 621b, or a part of the heat dissipation fins 621 in the middle heat dissipation fin group 621a and the rear heat dissipation fin group 621 c. It is understood that, in the case where the components of the downstream product create an air duct corresponding to the heat dissipation channel 116b, the heat dissipation channel 116b may also penetrate the top surface of the fixing structure 116, thereby communicating the heat dissipation channel 116b with the air duct.

Further, the upper end of middle fin group 621a extends into heat dissipation channel 116b, and the upper end of middle fin group 621a is higher than the upper ends of front fin group 621b and rear fin group 621 c.

In this embodiment, since the average heat transfer path of the middle fin group 621a is shortest and the average heat dissipation area of each heat dissipation fin 621 is largest, the heat dissipation capability can be improved to a greater extent by extending the upper end of the middle fin group 621a into the heat dissipation channel 116 b.

Further, referring to fig. 8, 9, 11 to 13, and 15, in an embodiment, the outer cover plate 623 further includes a plurality of empty portions 623a, the empty portions 623a are located at the upper end or the lower end of the rear fin group 621c and the upper end or the lower end of the front fin group 621b, the empty portions 623a correspond to the edge portion of the penetrating slot 115, and each empty portion 623a is provided with a through hole 623 b; the edge part of the penetration groove 115 is provided with a fixing hole 115a corresponding to the through hole 623 b; the light-shielding heat sink assembly 60 further includes a fastener 63, and the fastener 63 is engaged with the through hole 623b and the fixing hole 115a to fix the outer cover plate 623 to the outer side surface of the housing 10.

In this embodiment, the through hole 623b is disposed in the hollow portion 623a, so that when the fastener 63 is used to cooperate with the through hole 623b and the fixing hole 115a to fix the outer cover plate 623 to the first sidewall, interference of the adjacent heat dissipation fins 621 is reduced, so that a larger space for operating the fastener 63 can be obtained, thereby facilitating assembly.

Furthermore, a positioning hole 623c is formed in the edge portion of the outer cover plate 623 corresponding to the insertion groove 115, a positioning post 115b is formed in the edge portion of the insertion groove 115 corresponding to the positioning hole 623c, and the positioning post 115b is in positioning fit with the positioning hole 623 c.

In the present embodiment, the spatial position of the light shielding member 61 is related to not only the angle for shielding Off light but also the boundary between the bright-state light flux and other stray light. Therefore, the accuracy of the position of the light-shielding member 61 needs to be ensured for better light-shielding and projection effects. And the positioning post 115b is arranged to be matched with the positioning hole 623c, so that the heat dissipation member 62 and the first side wall can be quickly assembled, and the position accuracy of the light shielding member 61 can be ensured.

Furthermore, the positioning hole 623c is a blind hole formed in the inner side surface of the outer cover plate 623, the light-shielding and heat-dissipating component 60 further includes a sealing ring 73, an annular recess 115c surrounding the penetrating groove 115 is formed in the edge portion of the penetrating groove 115, the sealing ring 73 is adhered and embedded in the annular recess 115c and is in press fit with the outer cover plate 623, and the inner connecting plate 622 and the light-shielding member 61 penetrate through the sealing ring 73 and extend into the inner cavity 111.

In this embodiment, the sealing performance between the outer cover plate 623 and the housing 10 can be improved by providing the sealing ring 73, in other words, the difficulty of dust, vapor and the like entering the inner cavity 111 through the penetration groove 115 is improved. Moreover, because the sealing ring 73 is embedded in the annular concave part 115c, compared with the sealing ring directly laid on the planar outer side surface of the shell 10, the contact area between the sealing ring 73 and the shell 10 is larger, and the sealing ring is not too high to protrude out of the outer side surface of the shell 10 for supporting and limiting the outer cover plate 623, so that not only can a better sealing effect be obtained under the pressure action of the outer cover plate 623, but also the outer cover plate 623 can be accurately limited, and the installation precision of the heat sink 62 is ensured.

Further, the rear side surface of the inner connecting plate 622 is attached and fixed to the light shielding member 61, and the length of the front fin group 621b is greater than that of the rear fin group in the vertical direction.

In this embodiment, the light shielding member 61 is attached and fixed to the rear side of the inner connecting plate 622, so that on one hand, a sufficient thermal contact area can be ensured, and a heat transfer effect can be ensured. Since front fin group 621b is closer to the corner where the outer side surface of the first side wall is connected to the front side surface of the housing 10 than rear fin group 621c, the heat dissipation condition of front fin group 621b is better, so that the heat dissipation capability of the whole heat dissipation member 62 is improved by differently increasing the length of front fin group 621 b.

Further, referring to fig. 4, 9 to 11, 13, and 18 to 21, in an embodiment, the inner side surface 111a of the first side wall is provided with a first boss 111d, the inner side surface 111b of the second side wall is provided with a second boss 111c at a position adjacent to the front mounting opening 112, the second boss 111c is provided with a socket 111f, and the socket 111f penetrates through a top surface of the second boss 111c and a surface facing the first side wall; the inserting port 111f is arranged opposite to the penetrating groove 115 in the left-right direction, and the inner end of the light shielding piece 61 is inserted into the inserting port 111 f;

the beam splitting prism 20 further includes a first end surface 214 and a second end surface 215 which are oppositely disposed in the left-right direction; the first end face 214 is opposite to the first side wall, a first clamping cavity 117 is formed between the first end face 214 and the first side wall, and a second clamping cavity 118 is formed between the second end face 215 and the second side wall; the second boss 111c is located at the bottom of the second clip cavity 118; the second boss 111c is located at the bottom of the first clamping cavity 117 and at the rear side of the light shielding member 61;

the optical-mechanical assembly further comprises two first elastic pieces 71 respectively positioned at the bottoms of the first clamping cavity 117 and the second clamping cavity 118, and the inner cavity 111 further comprises a rear limiting surface 111g positioned at the periphery of the rear mounting port 113; in the second clamping cavity 118, the first elastic member 71 elastically connects the second boss 111c and the second end face 215 to make the beam splitter prism 20 abut against the rear limiting face 111 g; the first elastic member 71 elastically connects the first boss 111d and the first end surface 214 in the first clamping cavity 117 to make the beam splitting prism 20 abut against the rear limiting surface 111 g;

the first side wall and the second side wall are respectively provided with through holes 111e corresponding to the two first elastic pieces 71, and the two first elastic pieces 71 pass through the corresponding through holes 111e and are arranged at the bottom of the inner cavity 111; the outer cover plate 623 is provided with a clearance gap 623d corresponding to the via hole 111e on the first side wall, the lower end of the rear fin group 621c is flush with the upper edge of the clearance gap 623d, and the middle fin group 621a is flush with the front edge of the clearance gap 623 d.

In this embodiment, first, the installation of the first elastic member 71 can be facilitated by providing the second bosses 111c and the first bosses 111 d. The first elastic member 71 may provide the lower end of the prism 20 with backward elastic force by compression or extension of itself, but providing elastic force by compression may provide convenience in assembly. The insertion port 111f is used for inserting the inner end of the light shielding piece 61, and similar to the matching of the terminal of the connector and the elastic sheet, the matching of the inner end of the light shielding piece 61 and the insertion port 111f meets certain insertion and extraction force requirements. The second projection 111c is used for opening the insertion opening 111f and providing connection and support for the elastic member located in the second clamping cavity 118, so that the related structure inside the housing 10 is more compact. The detailed function and function of the beam splitting prism 20 can be referred to the foregoing description. Secondly, since the through holes 111e are formed in the first and second sidewalls, the first elastic element 71 is transversely mounted to the inner cavity 111 of the housing 10 through the through holes 111e, and the outer cover plate 623 is provided with the clearance gap 623d at the side of the first sidewall to prevent the first elastic element 71 from being assembled, so that the first elastic element 71 can be assembled before or after the heat dissipation member 62. Preferably, in order to ensure the tightness of the inner cavity 111, the optical-mechanical assembly further comprises a sealing plug 73, and the sealing plug 73 is mounted on the through hole 111e and is in sealing fit with the inner wall surface of the through hole 111 e. Since the first clamping cavity 117 and the second clamping cavity 118 penetrate the upper mounting opening 114, the first elastic member 71 can be adjusted or the components associated with the first elastic member 71 can be mounted from top to bottom.

Further, the optical-mechanical assembly further comprises two bottom supports 72 respectively located at the bottoms of the first clamping cavity 117 and the second clamping cavity 118, the bottom supports 72 comprise side connecting plates 721 and front baffle plates 722, the side connecting plates 721 of the two bottom supports 72 are respectively attached and adhesively fixed to the first end surface 214 and the second end surface 215, and the front baffle plates 722 are connected with one surfaces of the side connecting plates 721 away from the beam splitting prism 20;

in the second clamping cavity 118, the first elastic member 71 elastically abuts against the rear side surface of the second boss 111c and the front plate surface of the front baffle 722 so as to make the beam splitter prism 20 abut against the rear limiting surface 111 g; in the first clamping cavity 117, the first elastic member 71 elastically abuts against the rear side surface of the first boss 111d and the front plate surface of the front baffle 722 so that the splitting prism 20 abuts against the rear limiting surface 111 g.

In this embodiment, since the first end surface 214 and the second end surface 215 of the splitting prism 20 correspondingly form the side wall surfaces of the first clamping cavity 117 and the second clamping cavity 118, the two bottom brackets 72 respectively adhered to the first end surface 214 and the second end surface 215 are conveniently mounted to the inner cavity 111 of the housing 10 along with the splitting prism 20. By providing the front baffle 722, the first elastic member 71 is more firmly mounted, so that the front baffle 722 of the base member 72 is provided with a backward elastic force by the compression of the first elastic member 71 itself, and the splitting prism 20 is firmly abutted against the rear limiting surface 111g in the backward direction. In the assembling process, after the two bases 72 are mounted in the inner cavity 111 of the housing 10 along with the beam splitter prism 20, the first elastic member 71 is assembled between the corresponding second boss 111c and the front baffle 722 of the base 72 and between the first boss 111d and the front baffle 722 of the base 72 through the through hole 111e on the left and right side walls of the housing 10.

Further, the inner side surface 111b of the second side wall is provided with a socket 111f adjacent to the front mounting opening 112, the socket 111f is disposed opposite to the insertion groove 115 in the left-right direction, and the inner end of the light shielding member 61 is inserted into the socket 111 f.

In this embodiment, the inner end of the light shielding member 61 is inserted into the insertion port 111f disposed on the opposite side of the insertion groove 115, so that the spatial position of the light shielding member 61 can be easily and accurately ensured, and the light shielding member 61 is not easily deformed under the action of inertia force or thermal stress. The insertion port 111f is used for inserting the inner end of the light shielding piece 61, and similar to the matching of the terminal of the connector and the elastic sheet, the matching of the inner end of the light shielding piece 61 and the insertion port 111f meets certain insertion and extraction force requirements.

Further, the bottom wall surface of the inner cavity 111 is formed with lower limiting surfaces 111h at positions adjacent to the left and right wall surfaces, and the rear wall surface of the inner cavity 111 includes a rear limiting surface 111g located at the periphery of the rear mounting opening 113;

splitting prism 20 includes proximal prism 21 and distal prism 22 glued to each other, initial incident surface 211, proximal critical surface 213, and exit incident surface 212 are formed on proximal prism 21, and proximal prism 21 further includes proximal critical surface 213; the far-side prism 22 is glued with the near-side critical surface 213 and is arranged far away from the rear mounting port 113, and the top of the far-side prism 22 is provided with an emergent connecting surface 224 inclining backwards from top to bottom;

the initial incident surface 211 faces downwards and is attached to the lower limiting surface 111h, the near side critical surface 213 faces away from the rear mounting opening 113 and is glued with the far side prism 22, and the emergent incident surface 212 faces towards the rear mounting opening 113 and is attached to the rear limiting surface 111 g;

exit connection surface 224 is adjacent to proximal critical surface 213, an upper portion of proximal critical surface 213 protrudes from exit connection surface 224, and proximal critical surface 213 and exit connection surface 224 enclose recess 23 with an upward opening;

the optical-mechanical assembly further includes a second elastic member 52, the inner surface of the gland 51 includes a rear inclined surface 512a extending into the recess 23, the rear inclined surface 512a is disposed opposite to the proximal critical surface 213, and the second elastic member 52 elastically abuts between the rear inclined surface 512a and the proximal critical surface 213.

In this embodiment, by providing the rear inclined surface 512a extending into the concave portion 23 at the upper end of the splitting prism 20 and providing the second elastic member 52 between the rear inclined surface 512a and the near-side critical surface 213, the upper end of the near-side prism 21 can abut against the rear limiting surface 111g, and the lower end thereof can abut against the lower limiting surface 111h, thereby ensuring the stability of the near-side prism 21 in the front-rear direction. The detailed function and function of the beam splitting prism 20 can be referred to the foregoing description.

Further, referring to fig. 1 to 4 and fig. 9 again, in an embodiment, the pressing cover 51 includes a substrate 511 and a rear baffle 512, the substrate 511 is covered on the upper mounting opening 114, the rear baffle 512 extends downward from an inner side surface of the substrate 511 and extends into the concave portion 23, and a rear inclined surface 512a is formed on the rear baffle 512.

In this embodiment, the rear inclined surface 512a is formed on the backplate 512, which is advantageous to realizing a lightweight design of the gland 51 itself on the premise of ensuring the supporting strength of the rear inclined surface 512a, compared with the case where it is formed on a solid block-shaped structure.

The present invention further provides a projection optical machine, please refer to fig. 1 to fig. 4, fig. 7, and fig. 14, in an embodiment, the projection optical machine includes a DMD optical modulator 30, a projection lens 40, and an optical machine assembly as described above, the DMD optical modulator 30 is installed at the rear installation opening 113, and an optical modulation area of the DMD optical modulator 30 is disposed forward; the projection lens 40 is mounted in the front mounting opening 112. The specific structure of the optical-mechanical assembly 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 herein.

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

Claims (14)

1. An optical mechanical component comprises a shell (10), a beam splitter prism (20), a gland (51) and a shading and heat-radiating component (60),

the shell (10) is provided with an inner cavity (111), a first side wall and a second side wall which are oppositely arranged in the left-right direction, a front mounting opening (112) and a rear mounting opening (113) which are oppositely arranged in the front-rear direction, and an upper mounting opening (114) which is positioned at the upper part; the inner cavity (111) is formed between the first side wall and the second side wall, and the front mounting port (112), the rear mounting port (113) and the upper mounting port (114) are communicated with the inner cavity (111);

the first side wall is provided with a penetrating groove (115) communicated with the inner cavity (111) at a position adjacent to the front mounting opening (112); a fixing structure (116) is arranged at the upper end of the first side wall and/or the second side wall, and the fixing structure (116) is provided with an upward supporting surface (116 a);

the beam splitter prism (20) is installed in the inner cavity (111) through the upper installation opening (114), the beam splitter prism (20) comprises an initial incidence surface (211), an emergent incidence surface (212) facing the rear installation opening (113) and an imaging emergent surface (222) facing the front installation opening (112), the intersection line of the initial incidence surface (211) and the emergent incidence surface (212) is parallel to the left-right direction, and the gland (51) covers the upper installation opening (114);

the shading and heat dissipation assembly (60) comprises a shading piece (61) and a heat dissipation piece (62), the shading piece (61) penetrates through the penetrating groove (115) and extends into the inner cavity (111), and the outer end of the shading piece (61) is connected with the heat dissipation piece (62); the light shielding piece (61) is at least arranged opposite to the part of the imaging emergent surface (222) far away from the initial incident surface (211), and the heat dissipation piece (62) comprises a plurality of heat dissipation fins (621).

2. The opto-mechanical assembly of claim 1,

the heat dissipation member (62) further comprises an inner connecting plate (622) and an outer cover plate (623), the inner connecting plate (622) penetrates through the penetrating groove (115) and extends into the inner cavity (111), and the inner connecting plate (622) is attached and fixed with the light shading member (61); the outer cover plate (623) is connected with the outer end of the inner connecting plate (622) and covers the penetrating groove (115); the heat radiating fins (621) are arranged on the outer side surface of the outer cover plate (623);

each heat radiating fin (621) extends along the vertical direction and the horizontal direction; the plurality of radiating fins (621) are divided into a middle radiating fin group (621a), a front radiating fin group (621b) positioned on the front side of the middle radiating fin group (621a), and a rear radiating fin group (621c) positioned on the rear side of the middle radiating fin group (621 a);

in the front-rear direction, the middle fin group (621a) is closer to the inner connecting plate (622) of the heat sink (62) than the front fin group (621b) and the rear fin group (621 c); in the up-down direction, the length of middle fin group (621a) is greater than the lengths of front fin group (621b) and rear fin group (621 c).

3. The opto-mechanical assembly of claim 2,

a fixing structure (116) is arranged at the upper end of the first side wall, and the fixing structure (116) is formed by extending from the outer side surface of the first side wall to the direction far away from the second side wall;

the bottom surface of fixed knot structure (116) is equipped with heat dissipation channel (116b), heat dissipation channel (116b) with the side of fixed knot structure (116) is kept away from the second lateral wall is crossing, heat dissipation channel (116b) are close to heat dissipation fin (621) sets up, and at least part heat dissipation fin (621) stretch into heat dissipation channel (116 b).

4. The optical-mechanical assembly according to claim 3, wherein the upper end of the middle fin set (621a) extends into the heat dissipation channel (116b), and the upper end of the middle fin set (621a) is higher than the upper ends of the front fin set (621b) and the rear fin set (621 c).

5. The bare engine assembly according to claim 4, wherein the outer cover plate (623) further comprises a plurality of empty parts (623a), the empty parts (623a) are located at the upper end or lower end of the rear fin group (621c) and the upper end or lower end of the front fin group (621b), the empty parts (623a) correspond to the edge part of the penetrating slot (115), and each empty part (623a) is provided with a through hole (623 b); the edge part of the penetrating groove (115) is provided with a fixing hole (115a) corresponding to the through hole (623 b); the shading and heat-dissipating assembly (60) further comprises a fastener (63), and the fastener (63) is matched with the through hole (623b) and the fixing hole (115a) to fix the outer cover plate (623) to the outer side face of the shell (10).

6. The optical mechanical assembly according to claim 5, wherein a positioning hole (623c) is formed in an edge portion of the outer cover plate (623) corresponding to the penetrating slot (115), a positioning post (115b) is formed in an edge portion of the penetrating slot (115) corresponding to the positioning hole (623c), and the positioning post (115b) is in positioning fit with the positioning hole (623 c).

7. The optical mechanical assembly according to claim 6, wherein the positioning hole (623c) is a blind hole formed in an inner side surface of the outer cover plate (623), the light shielding and heat dissipating assembly (60) further comprises a sealing ring (64), an annular recess (115c) surrounding the insertion groove (115) is formed in an edge portion of the insertion groove (115), the sealing ring (64) is adhesively embedded in the annular recess (115c) and is in press fit with the outer cover plate (623), and the inner connecting plate (622) and the light shielding member (61) penetrate through the sealing ring (64) and extend into the inner cavity (111).

8. The opto-mechanical assembly according to claim 2, wherein the rear side of the inner plate (622) is attached and fixed to the light shielding member (61), and the length of the front fin group (621b) is greater than that of the rear fin group in the vertical direction.

9. The opto-mechanical assembly of any of claims 2-8,

a first boss (111d) is arranged on the inner side surface (111a) of the first side wall, a second boss (111c) is arranged on the inner side surface (111b) of the second side wall at a position adjacent to the front mounting opening (112), an insertion opening (111f) is formed in the second boss (111c), and the insertion opening (111f) penetrates through the top surface of the second boss (111c) and one surface facing the first side wall; the inserting port (111f) is arranged opposite to the penetrating groove (115) in the left-right direction, and the inner end of the shading piece (61) is inserted into the inserting port (111 f);

the beam splitter prism (20) further comprises a first end surface (214) and a second end surface (215) which are oppositely arranged in the left-right direction; the first end face (214) is opposite to the first side wall, a first clamping cavity (117) is formed between the first end face (214) and the first side wall, and a second clamping cavity (118) is formed between the second end face (215) and the second side wall; the second boss (111c) is located at the bottom of the second clamp cavity (118); the second boss (111c) is positioned at the bottom of the first clamping cavity (117) and at the rear side of the light shielding piece (61);

the optical-mechanical assembly further comprises two first elastic pieces (71) which are respectively positioned at the bottoms of the first clamping cavity (117) and the second clamping cavity (118), and the inner cavity (111) further comprises a rear limiting surface (111g) which is positioned at the periphery of the rear mounting port (113); in the second clamping cavity (118), the first elastic piece (71) elastically connects the second boss (111c) and the second end face (215) to enable the beam splitter prism (20) to abut against the rear limiting face (111 g); the first elastic piece (71) elastically connects the first boss (111d) and the first end face (214) in the first clamping cavity (117) to enable the beam splitter prism (20) to abut against the rear limiting face (111 g);

the first side wall and the second side wall are respectively provided with through holes (111e) corresponding to the two first elastic pieces (71), and the two first elastic pieces (71) penetrate through the through holes (111e) and are installed at the bottom of the inner cavity (111); the outer cover plate (623) is provided with a clearance gap (623d) corresponding to the via hole (111e) on the first side wall, the lower end of the rear radiating fin group (621c) is flush with the upper edge of the clearance gap (623d), and the middle radiating fin group (621a) is flush with the front edge of the clearance gap (623 d).

10. The optical-mechanical assembly according to claim 9, further comprising two bottom brackets (72) respectively located at the bottoms of the first clamping cavity (117) and the second clamping cavity (118), wherein the bottom brackets (72) comprise side connecting plates (721) and front baffle plates (722), the side connecting plates (721) of the two bottom brackets (72) are respectively attached and adhesively fixed to the first end surface (214) and the second end surface (215), and the front baffle plates (722) are connected to the side connecting plates (721) facing away from the beam splitting prism (20);

in the second clamping cavity (118), the first elastic piece (71) elastically abuts against the rear side surface of the second boss (111c) and the front plate surface of the front baffle plate (722) so as to enable the beam splitter prism (20) to abut against the rear limiting surface (111 g); in the first clamping cavity (117), the first elastic piece (71) elastically abuts against the rear side surface of the first boss (111d) and the front plate surface of the front baffle plate (722) so that the beam splitter prism (20) abuts against the rear limiting surface (111 g).

11. The opto-mechanical assembly according to claim 1, characterized in that the inner side surface (111b) of the second side wall is provided with an insertion opening (111f) adjacent to the front mounting opening (112), the insertion opening (111f) is arranged opposite to the penetration groove (115) in the left-right direction, and the inner end of the light shielding member (61) is inserted into the insertion opening (111 f).

12. The opto-mechanical assembly of any of claims 1-8 and 11,

the bottom wall surface of the inner cavity (111) is provided with lower limiting surfaces (111h) at positions adjacent to the left wall surface and the right wall surface, and the rear wall surface of the inner cavity (111) comprises a rear limiting surface (111g) positioned at the periphery of the rear mounting opening (113);

the beam splitter prism (20) comprises a near side prism (21) and a far side prism (22) which are glued with each other, the initial incidence plane (211), a near side critical plane (213) and an emergent incidence plane (212) are formed on the near side prism (21), and the near side prism (21) further comprises a near side critical plane (213); the far-side prism (22) is glued with the near-side critical surface (213) and is arranged far away from the rear mounting opening (113), and the top of the far-side prism (22) is provided with an emergent connecting surface (224) inclining backwards from top to bottom;

the initial incidence surface (211) faces downwards and is attached to the lower limiting surface (111h), the near-side critical surface (213) faces away from the rear mounting opening (113) and is bonded with the far-side prism (22), and the emergent incidence surface (212) faces towards the rear mounting opening (113) and is attached to the rear limiting surface (111 g);

the exit connection surface (224) is adjacent to the near-side critical surface (213), the upper part of the near-side critical surface (213) protrudes out of the exit connection surface (224), and the near-side critical surface (213) and the exit connection surface (224) enclose a recess (23) with an upward opening;

the optical mechanical component further comprises a second elastic member (52), the inner surface of the gland (51) comprises a rear inclined surface (512a) extending into the recess (23), the rear inclined surface (512a) is arranged opposite to the near-side critical surface (213), and the second elastic member (52) is elastically abutted between the rear inclined surface (512a) and the near-side critical surface (213).

13. The opto-mechanical assembly of claim 12 wherein the cover (51) comprises a base plate (511) and a back plate (512), the base plate (511) covers the upper mounting opening (114), the back plate (512) extends downward from an inner side surface of the base plate (511) and extends into the recess (23), and the back inclined surface (512a) is formed on the back plate (512).

14. A projection light engine comprising a DMD light modulator (30), a projection lens (40) and the light engine assembly of any of claims 1 to 13, the DMD light modulator (30) being mounted at the rear mounting opening (113), the light modulation area of the DMD light modulator (30) being arranged forward; the projection lens (40) is mounted at the front mounting opening (112).

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