CN214670032U - 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 gland component, a beam splitter prism, a DMD optical modulator and a projection lens, wherein, the shell is provided with an upper mounting port communicated with the inner cavity of the shell; the initial incidence surface of the beam splitter prism faces downwards and is attached to the lower limiting surface, and the emergent incidence surface of the beam splitter prism faces the DMD optical modulator and is attached to the rear limiting surface; the beam splitter prism comprises a concave part with an upward opening formed at the top, the concave part comprises a first matching surface and a second matching surface, the first matching surface inclines forwards from top to bottom, and the second matching surface inclines backwards from top to bottom; the gland component comprises a gland, an elastic pressing block and elastic glue, the gland is fixed to cover the upper mounting opening, the inner surface of the gland comprises a front inclined plane and a rear inclined plane, the front inclined plane extends into the concave portion, the front inclined plane is adjacent to the emergent connecting surface and is fixed with the emergent connecting surface through the elastic glue, and the elastic pressing block is pressed between the rear inclined plane and the near side critical surface. The utility model discloses an its beam split prism of ray apparatus subassembly easily assembles and the steadiness is high.

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 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 position of the DMD light modulator is adjusted with the beam splitter prism as a fixed reference. In the latter approach, the splitting prism itself is required to be assembled highly stably.

In the related art, in the optical-mechanical assembly comprising a shell and a light splitting prism, the shell is provided with a cavity with an upward opening, the light splitting prism is arranged in the cavity of the shell along the direction perpendicular to the cross section, the end face of the light splitting prism except the parallel cross section faces upward or downward, and the orientation of other light processing interfaces is parallel to the assembling direction of the light splitting prism. In the structure, the limiting and fixing of the beam splitter prism are realized by adopting the extrusion assembly of a plurality of elastic pieces. However, if the above related art is still directly applied after the spatial position of the beam splitter prism is changed to set the initial exit surface of the beam splitter prism downward, the beam splitter prism needs to be laterally installed on one hand, and on the other hand, the original extrusion assembly may be unbalanced under the action of additional inertia to cause the beam splitter prism to swing and further cause an assembly error with the DMD optical modulator.

SUMMERY OF THE UTILITY MODEL

Based on above-mentioned current situation, the utility model discloses a main aim at provides an installation that can make things convenient for beam splitter prism and can guarantee the ray apparatus subassembly and the projection ray apparatus that the mounted position of beam splitter prism is firm.

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

an optical-mechanical assembly comprises a housing, a cover assembly, a beam splitter prism, a DMD optical modulator and a projection lens,

the shell is provided with an inner cavity, an upper mounting port, a front mounting port and a rear mounting port, wherein the upper mounting port, the front mounting port and the rear mounting port are communicated with the inner cavity; the bottom wall surface of the inner cavity is provided with lower limiting surfaces at the 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 DMD optical modulator and the projection lens are respectively arranged at the rear mounting port and the front mounting port; the upper mounting opening is provided with a size for the beam splitter prism to pass through, and the beam splitter prism passes through the upper mounting opening and is mounted in the inner cavity of the shell;

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

the initial incidence surface of the beam splitter prism faces downwards and is attached to the lower limiting surface, and the emergent incidence surface of the beam splitter prism faces towards the DMD optical modulator and is attached to the rear limiting surface;

the top of the light splitting prism forms a concave part with an upward opening; the concave part comprises a first matching surface and a second matching surface, the first matching surface is inclined forwards from top to bottom, and the second matching surface is inclined backwards from top to bottom

The gland component comprises a gland, an elastic pressing block and elastic glue, the gland is fixedly covered on the upper mounting opening, the inner surface of the gland comprises a front inclined plane and a rear inclined plane which extend into the concave part, and the front inclined plane is adjacent to the second matching surface and is fixed with the second matching surface through the elastic glue; the back inclined plane is opposite to the first matching surface, and the elastic pressing block is pressed between the back inclined plane and the first matching surface.

Preferably, the gland includes base plate and preceding baffle, the base plate lid closes go up the installing port, preceding baffle is certainly the inboard face downwardly extending of base plate forms and stretches into the concave part, preceding baffle is from top to bottom to incline the setting backward, preceding inclined plane forms on the preceding baffle.

Preferably, the gland further comprises a rear baffle plate, the rear baffle plate extends downwards from the inner side surface of the base plate and extends into the concave part, and the rear inclined surface is formed on the rear baffle plate; the lower edge of the rear baffle is connected with the lower edge of the front baffle.

Preferably, the base plate is recessed downwards from the top surface to form an outer groove, the front baffle plate forms the front side part of the outer groove, and the rear baffle plate forms the rear side part of the outer groove; and the front baffle is provided with a glue dispensing hole penetrating through the front inclined plane.

Preferably, the front baffle is provided with two dispensing holes, and the two dispensing holes are arranged at intervals along the left-right direction; one side of the rear baffle facing the near side critical surface is provided with two mounting grooves, the rear inclined surface forms a bottom wall surface of the mounting grooves, and the mounting grooves are arranged at intervals in the left-right direction; the elastic pressing blocks are provided with two elastic pressing blocks which are correspondingly embedded in the mounting grooves one by one.

Preferably, the inner wall surface of the outer groove is provided with a partition plate extending in the front-rear direction, and the position of the partition plate is between the corresponding positions of the two mounting grooves.

Preferably, the mounting groove is arranged downwards in an open manner.

Preferably, the mounting groove comprises side wall surfaces which are oppositely arranged in the left-right direction and a downward top wall surface, the joints of the top wall surface and the two side wall surfaces are both provided with avoiding grooves, and the elastic pressing block is attached to the top wall surface and the side wall surfaces; the elastic pressing block is fixedly bonded on the rear inclined plane.

Preferably, the back slope is parallel to the proximal critical surface, and the cross-sectional size of the elastic pressing block in the normal direction of the proximal critical surface is constant.

The utility model also provides a projection ray apparatus, include as above ray apparatus subassembly.

The utility model discloses an optical machine subassembly is through offering the installing port on the casing, and beam splitter prism can pack into the appearance chamber of casing from top to bottom equally, and the initial incident surface through making beam splitter prism is to the mode down. The upper end of the beam splitter prism can abut against the rear limiting surface by arranging the rear inclined surface to extend into the concave part, and the elastic pressing block is arranged between the rear inclined surface and the first matching surface, so that the lower end of the beam splitter prism can abut against the lower limiting surface, and the stability of the beam splitter prism in the front-rear direction is ensured. In combination with the above, a concave part is further arranged, wherein the front inclined plane extends into the upper end of the beam splitter prism, and elastic glue is arranged to bond and fix the front inclined plane and the second matching surface, so that when the upper end of the beam splitter prism tilts backwards and the lower end of the beam splitter prism dislocates backwards under the inertia effect of the beam splitter prism or the elastic force of the elastic pressing block is unbalanced, the pressure stress generated by the elastic glue can block or buffer the trend; and when the upper end of the beam splitter prism swings backwards and the lower end of the beam splitter prism turns forwards, the tensile stress generated by the elastic glue can reinforce the elastic pressing block, so that the trend can be hindered or buffered. And because the elastic glue and the elastic pressing block are arranged adjacently and are both positioned in the concave part at the upper end of the beam splitter prism, the force arms of the elastic glue and the elastic pressing block relative to the gravity center of the beam splitter prism are also close to each other, so that the elastic glue and the elastic pressing block can resist larger inertia force which possibly causes the dislocation of the beam splitter prism by mutual matching. Therefore, the optical-mechanical assembly of the utility model has the advantages that on one hand, the beam splitter prism can keep the original assembly mode from top to bottom, so that the assembly is convenient and the space on the side surface of the shell is not occupied, and if the shell is formed by integral injection molding or metal die-casting, the lateral die-drawing direction for manufacturing the shell can be reduced, thereby reducing the manufacturing cost; on the other hand fixes beam splitter prism through elastic pressing block and elastic glue cooperation and has promoted beam splitter prism assembly steadiness, and then has guaranteed the operational reliability of ray apparatus subassembly.

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 of an optical module and a projection optical machine 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 an optical engine assembly according to the present invention, wherein the front side of the lens is a projection beam simulation;

FIG. 2 is a top view of the opto-mechanical assembly 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 side view of the opto-mechanical assembly 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 structural view of the inside of the gland of FIG. 8;

FIG. 10 is a schematic view of a matching structure of the beam splitter prism and the elastic pressing block in FIG. 8;

fig. 11 is a schematic view of the structure of fig. 10 from another angle.

The reference numbers illustrate:

Detailed Description

Referring to fig. 1 to 6, in an embodiment, the opto-mechanical assembly provided by the present invention includes a housing 10, a cover assembly 20, a beam splitter prism 30, a DMD optical modulator 40 and a projection lens 50, wherein,

the housing 10 has an inner cavity 111, and an upper mounting port 112, a front mounting port 113, and a rear mounting port 114 communicating with the inner cavity 111; the bottom wall surface of the inner cavity 111 is provided with lower limiting surfaces 115 at the 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 116 positioned at the periphery of the rear mounting opening 114;

the DMD light modulator 40 and the projection lens 50 are respectively installed at the rear installation port 114 and the front installation port 113; the upper mounting port 112 has a size through which the prism 30 passes, and the prism 30 is mounted in the inner cavity 111 of the housing 10 through the upper mounting port 112;

the initial incident surface 311 of the beam splitter prism 30 faces downward and is attached to the lower limiting surface 115, and the exit incident surface 313 of the beam splitter prism 30 faces the DMD light modulator 40 and is attached to the rear limiting surface 116;

a concave part 33 with an upward opening is formed at the top of the beam splitter prism 30; the concave portion 33 includes a first engagement surface 312 and a second engagement surface 321, the first engagement surface 312 is inclined forward from top to bottom, and the second engagement surface 321 is inclined backward from top to bottom;

the gland assembly 20 includes a gland 21, a resilient pressing block 22 and a resilient glue (not shown), the gland 21 is fixedly covered on the upper mounting opening 112, the inner surface of the gland 21 includes a front inclined surface 211 and a rear inclined surface 212 extending into the recess 33, the front inclined surface 211 is adjacent to the second mating surface 321 and is fixed with the second mating surface 321 by the resilient glue; the back inclined surface 212 is disposed opposite to the first matching surface 312, and the elastic pressing block 22 is pressed between the back inclined surface 212 and the first matching surface 312.

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 optical mechanical assembly. Specifically, the opto-mechanical assembly further comprises an optical illumination system including light sources (61a, 61b, 61c, 61d) and three colors, and a reflector 70

The modulation module and the housing 10 may be integrated or separated, and the optical illumination system, the reflector 70 and the beam splitter prism 30 may be laid on the housing 10 along the same plane, or may be mounted on the housing 10 along more than one plane.

It is understood that the beam splitting prism can be a TIR (Total Internal Reflection) prism, an RTIR prism, or a single prism. The first engagement surface 312 and the second engagement surface 321 may be formed by surfaces of the prism itself that processes the light beam or may be formed by members that are additionally fixed to the prism. Referring to fig. 3, 4, 8, 10 and 11, in an embodiment, the splitting prism 30 includes a near side prism 31 and a far side prism 32 glued to each other, and the near side prism 31 includes an initial incident surface 311, a near side critical surface (a part of the first mating surface 312 constitutes the near side critical surface), and an exit incident surface 313; the top of the distal prism 32 has an exit connection surface 321 inclined backward from top to bottom (a part or the whole area of the exit connection surface 321 constitutes the second mating surface 321); the initial incident surface 311 faces downwards and is attached to the lower limiting surface 115, the near-side critical surface deviates from the DMD optical modulator 40 and is glued with the far-side prism 32, and the emergent incident surface 313 faces towards the DMD optical modulator 40 and is attached to the rear limiting surface 116; the far-side prism 32 is bonded with the near-side critical surface and is arranged far away from the DMD optical modulator 40, the emergent connection surface 321 is adjacent to the near-side critical surface, the upper part of the near-side critical surface protrudes out of the emergent connection surface 321, and the near-side critical surface and the emergent connection surface 321 enclose to form a concave part 33 with an upward opening

The beam splitter prism 30 cooperates with the DMD digital micromirror to convert the illumination light path into a projection light path under the action of the DMD light modulator 40. Proximal prism 31 further includes first end surface 314 and second end surface 315 disposed oppositely, and initial incident surface 311, proximal critical surface, and exit incident surface 313 are located between first end surface 314 and second end surface 315. Distal prism 32 further includes a third end surface 322, a fourth end surface 323, and a distal critical surface 324 and an imaging exit surface 325, which are disposed oppositely, wherein distal critical surface 324, imaging exit surface 325, and exit connection surface 321 are located between third end surface 322 and fourth end surface 323, imaging exit surface 325 is disposed toward projection lens 50, and distal critical surface 324 is glued to the proximal critical surface and an air gap is formed therebetween. In order to reduce the cost, the proximal prism 31 and the distal prism 32 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.

The DMD light modulator 40 is configured to control the on/off of the light beam according to the received image signal, thereby implementing image display. The projection lens 50 is used to enlarge and transmit the image modulated by the DMD light modulator 40 onto the screen.

The DMD optical modulator 40 includes a DMD optical modulator 40 receiving light incident from a long side and a DMD optical modulator 40 receiving light incident from a short side, when the DMD optical modulator 40 receiving light incident from a long side is applied, that is, when a rectangular modulation area of the DMD optical modulator 40 uses the long side as an incident side of an illumination beam, in order to reduce the height of the optical mechanical assembly, the housing 10 includes a first housing 11 and a second housing 12, the first housing 11 and the second housing 12 are spliced up and down, and the spliced portions communicate with respective internal cavities, so that the above-mentioned inner cavity 111, the upper mounting port 112, the front mounting port 113, the rear mounting port 114, the lower limiting surface 115, and the rear limiting surface 116 are formed on the first housing 11. The light source (61a, 61b, 61c, 61d) is arranged in the second shell 12, and the three-color modulation component is arranged in the inner cavity of the second shell 12 along the horizontal plane; the reflector 70 is installed in the inner cavity of the second housing 12 through the splicing opening of the second housing 12; the reflector 70 is used for reflecting the three-color light modulated by the three-color modulation assembly toward the inner cavity 111 of the first housing 11; the projection lens 50 is connected with the first shell 11, and the beam splitter prism 30 is installed in the internal cavity of the first shell 11; the initial incident surface 311 of the splitting prism 30 faces the second housing 12 to receive the light reflected by the reflecting mirror 70. In this way, the mirror 70 provided in the lower case 10 can reflect the illumination light beams of the three substantially horizontal colors upward, so that the illumination light beams processed by the dichroic prism 30 can directly enter through the long side of the modulation area of the DMD optical modulator 40, thereby ensuring that the DMD optical modulator 40 modulates a rectangular picture. Since the light beam received by the reflector 70 is substantially horizontal, the light sources (61a, 61b, 61c, 61d) and the three-color modulation assembly can still be arranged and mounted on the lower housing 10 along the horizontal plane, thereby reducing the height of the optical-mechanical assembly as a whole. In addition, because the lower splicing interface is utilized for installing the reflector 70, installation openings do not need to be arranged at other positions of the lower shell 10 for installing the reflector 70, and the shell 10 of the projector is more compact in structure.

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 (61a, 61b, 61c, 61d) 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 and select dichroic mirror, colour wheel, fluorescence wheel and X prism etc. again according to the difference of light source. Specifically, the trichromatic modulation assembly includes a trichromatic modulation assembly including a collimating lens group (621a, 621b, 621c), a dichroic mirror (622a, 622b), a relay lens 623, and a fly eye lens group 624.

The light emitted from the light sources (61a, 61b, 61c, 61d) of the optical illumination system is internally adjusted to output parallel light, and the reflecting mirror 70 changes the propagation direction of the parallel light. The optical illumination system further comprises a converging lens group (63a, 63b), the converging lens group (63a, 63b) for converting 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 processed by a lens on the lower side of the converging lens group (63a, 63b) and then irradiated onto the reflecting mirror 70, and is further transmitted to the free-form surface lens on the upper side of the converging lens group (63a, 63b) in a changed direction. The light converted by the condensing lens groups (63a, 63b) is transmitted to the initial incident surface 311 of the beam splitting prism 30. The cross section of the prism 30 is perpendicular to the initial incident surface 311, and when the prism 30 is TIR (Total Internal Reflection) and is formed by gluing two prisms, the cross section of the prism 30 is also perpendicular to the gluing surfaces of the two prisms.

Referring to fig. 7 and 8, the cover of the pressing cover 21 and the upper mounting opening 112 is preferably detachable, for example, a plurality of fixing holes are disposed around the upper mounting opening 112 at the edge of the upper mounting opening 112, and a through hole is correspondingly disposed at the edge of the pressing cover 21, and then the detachable cover of the pressing cover 21 can be realized by passing a bolt through the through hole and screwing the bolt into the fixing hole. In order to prevent moisture or dust from entering the inner cavity 111 of the housing 10, an annular seal may be further provided between the gland 21 and the edge portion of the upper mounting port 112.

The utility model discloses an optical-mechanical module is through offering installing port 112 on casing 10, and spectral prism 30 can pack into the appearance chamber of casing 10 from top to bottom equally, and the face 321 is connected with the outgoing through the near side critical surface that makes spectral prism 30 encloses the concave part 33 mode up that closes and form. By providing rear inclined surface 212 extending into recess 33 and providing resilient pressing piece 22 between rear inclined surface 212 and the proximal critical surface, the upper end of proximal prism 31 can abut against rear limiting surface 116, and the lower end can abut against lower limiting surface 115, thereby ensuring the stability of proximal prism 31 in the front-rear direction. In combination with this, the front inclined plane 211 is further provided to extend into the concave part 33 at the upper end of the beam splitter prism 30, and the elastic glue is provided to bond and fix the front inclined plane 211 and the outgoing connecting surface 321, so that when the upper end of the beam splitter prism 30 tilts backwards and the lower end of the beam splitter prism 30 dislocates backwards under the inertia effect of the beam splitter prism 30 or the elastic force of the elastic pressing block 22 is unbalanced, the pressure stress generated by the elastic glue will block or buffer the trend; and when the upper end of the beam splitter prism 30 swings backwards and the lower end of the beam splitter prism 30 turns forwards, the tensile stress generated by the elastic glue can reinforce the elastic pressing block 22 so as to also hinder or buffer the tendency. And because the elastic glue and the elastic pressing block 22 are arranged adjacently and are both positioned in the concave part 33 at the upper end of the beam splitter prism 30, the force arms of the elastic glue relative to the gravity center of the beam splitter prism 30 are also close in size, so that the elastic glue and the elastic pressing block can resist larger inertial force which possibly causes the dislocation of the beam splitter prism 30 by matching. Therefore, the optical-mechanical assembly of the present invention, on one hand, the beam splitter prism 30 can keep the original assembly manner from top to bottom, so that the assembly is convenient and the space on the side of the housing 10 is not occupied, if the housing 10 is formed by integral injection molding or metal die casting, the lateral draft direction for manufacturing the housing 10 can be reduced, thereby reducing the manufacturing cost; on the other hand, the assembly stability of the beam splitter prism 30 is improved by matching the elastic pressing block 22 with the elastic glue to fix the beam splitter prism 30, and the working reliability of the optical-mechanical assembly is further ensured.

Further, referring to fig. 1 to 4 and fig. 7 to 9, in an embodiment, the pressing cover 21 includes a base plate 213 and a front baffle 218, the base plate 213 covers the upper mounting opening 112, the front baffle 218 extends downward from an inner side surface of the base plate 213 and extends into the concave portion 33, the front baffle 218 is disposed to be inclined backward from top to bottom, and the front inclined surface 211 is formed on the front baffle 218.

In the present embodiment, as well as the previous embodiment in which the rear baffle 214 is provided, by providing the thin-walled structure of the front baffle 218 to form the front slope 211, it is advantageous to realize a light-weight design of the gland 21 itself while ensuring the bending strength of the front slope 211, compared to forming the front slope 211 on a solid block-shaped structure.

Further, the gland 21 further includes a back plate 214, the back plate 214 is formed to extend downward from the inner side surface of the base plate 213 and to protrude into the concave portion 33, and a back slope 212 is formed on the back plate 214; the lower edge of the tailgate 214 is connected to the lower edge of the front tailgate 218.

In this embodiment, the front and rear baffles 218 and 214 can be connected to each other to support each other and to make the gland 21 more compact in structure.

Further, the base plate 213 is recessed downward from the top surface to form an outer groove 216, the front bezel 218 forms a front side of the outer groove 216, and the rear bezel 214 forms a rear side of the outer groove 216.

In this embodiment, the substrate 213 is recessed inward from the top surface to form the front and rear baffles 218 and 214, so as to increase the supporting strength of the front and rear baffles 218 and 214; preferably, the front baffle 218 is provided with a dispensing hole 218a penetrating the front inclined plane 211. In this embodiment, by providing the dispensing hole 218a, it is possible to apply the elastic glue from the outside of the gland 21 after the assembly of the gland 21 is completed. Since the elastic glue is generally formed by curing a liquid material, the manner of applying the elastic glue may be to drop the liquid glue into the glue dispensing hole 218a, and then the glue fills between the front inclined surface 211 and the exit connecting surface 321, and after the glue is cured, the elastic glue for adhering and fixing the front inclined surface 211 and the exit connecting surface 321 is formed.

Further, two dispensing holes 218a are provided in the front baffle 218, and the two dispensing holes 218a are arranged at intervals in the left-right direction; one side of the rear baffle plate 214 facing the near-side critical surface is provided with two mounting grooves 215, the rear inclined surface 212 forms a bottom wall surface of the mounting grooves 215, and the mounting grooves 215 are arranged at intervals in the left-right direction; two elastic pressing blocks 22 are correspondingly embedded in the mounting grooves 215 one by one.

In this embodiment, the two elastic pressing blocks 22 are provided, so that the elastic force distribution of the elastic pressing blocks 22 is more balanced and the fixing of the beam splitter prism 30 is more stable. Two glue dispensing holes 218a are also provided to facilitate the application of the elastic glue corresponding to the two elastic pressing blocks 22, so that the elastic glue can be better matched with the elastic pressing blocks 22.

Further, the inner wall surface of the outer groove 216 is provided with a partition 217 extending in the front-rear direction, and the position of the partition 217 is between the positions corresponding to the two mounting grooves 215.

In this embodiment, the partition 217 may further enhance the deformation resistance of the wall body of the outer groove 216, so as to ensure the accuracy of the elastic force of the elastic pressing block 22. Preferably, the mounting groove 215 is open downward for facilitating the drawing and increasing the mounting direction of the elastic pressing piece 22.

Further, the mounting groove 215 includes side wall surfaces 215a disposed opposite to each other in the left-right direction, and a top wall surface 215b facing downward, a clearance groove 215c is disposed at a connection portion between the top wall surface 215b and the side wall surfaces 215a, and the elastic pressing block 22 is attached to the top wall surface 215b and the side wall surfaces 215 a.

In this embodiment, when the elastic pressing block 22 is attached to the top wall surface 215b and the side wall surface 215a, both the avoiding groove 215c and the downward opening of the mounting groove 215 can provide a avoiding space for the lateral deformation of the elastic pressing block 22. Preferably, in order to facilitate assembly and prevent displacement of the spring pressing piece 22, the spring pressing piece 22 is fixed on the rear inclined surface 212 in an adhering manner, so that the spring pressing piece 22 can be installed together with the pressing cover 21 and the connection position of the spring pressing piece 22 is ensured to be unchanged.

Further, trailing slope 212 is parallel to the proximal critical plane, and the cross-sectional size of spring compact 22 normal to the proximal critical plane is constant.

In this embodiment, the rear slope 212 for transmitting the initial pressure to the elastic pressing block 22 is arranged in parallel to the target elastic force acting surface of the elastic pressing block 22, so that when the distance between the rear slope 212 and the near-side critical surface is gradually reduced, the size of the cross section of the elastic pressing block 22 in the normal direction of the near-side critical surface is constant, and thus the change of the generated elastic force is close to linear change, thereby conveniently designing the elastic force with a proper size for the elastic pressing block 22.

The utility model also provides a projection ray apparatus, include as above ray apparatus subassembly. 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 (10)

1. An optical-mechanical assembly, comprising a housing (10), a cover pressing assembly (20), a beam splitter prism (30), a DMD optical modulator (40) and a projection lens (50), wherein,

the shell (10) is provided with an inner cavity (111), and an upper mounting port (112), a front mounting port (113) and a rear mounting port (114) which are communicated with the inner cavity (111); the bottom wall surface of the inner cavity (111) is provided with lower limiting surfaces (115) 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 (116) positioned at the periphery of the rear mounting opening (114);

the DMD light modulator (40) and the projection lens (50) are respectively arranged on the rear mounting port (114) and the front mounting port (113); the upper mounting opening (112) has a size for the beam splitter prism (30) to pass through, and the beam splitter prism (30) is mounted in the inner cavity (111) of the shell (10) through the upper mounting opening (112);

the initial incidence surface (311) of the beam splitter prism (30) faces downwards and is attached to the lower limiting surface (115), and the emergent incidence surface (313) of the beam splitter prism (30) faces towards the DMD optical modulator (40) and is attached to the rear limiting surface (116);

the top of the light splitting prism (30) is provided with a concave part (33) with an upward opening; the concave part (33) comprises a first matching surface (312) and a second matching surface (321), wherein the first matching surface (312) inclines forwards from top to bottom, and the second matching surface (321) inclines backwards from top to bottom;

the gland assembly (20) comprises a gland (21), an elastic pressing block (22) and elastic glue, the gland (21) is fixedly covered on the upper mounting opening (112), the inner surface of the gland (21) comprises a front inclined surface (211) and a rear inclined surface (212) which extend into the concave part (33), and the front inclined surface (211) is adjacent to the second matching surface (321) and is fixed with the second matching surface (321) through the elastic glue; the back inclined surface (212) is opposite to the first matching surface (312), and the elastic pressing block (22) is pressed between the back inclined surface (212) and the first matching surface (312).

2. The opto-mechanical assembly of claim 1, wherein the cover (21) comprises a base plate (213) and a front bezel (218), the base plate (213) covers the upper mounting opening (112), the front bezel (218) extends downward from an inner side surface of the base plate (213) and extends into the recess (33), the front bezel (218) is disposed to be inclined backward from top to bottom, and the front bevel (211) is formed on the front bezel (218).

3. The opto-mechanical assembly of claim 2 wherein the gland (21) further comprises a back plate (214), the back plate (214) extending downwardly from the inner side of the base plate (213) and into the recess (33), the back ramp (212) being formed on the back plate (214); the lower edge of the tailgate (214) is connected to the lower edge of the front tailgate (218).

4. The opto-mechanical assembly of claim 3 wherein the base plate (213) is recessed downwardly from a top surface to form an outer groove (216), the front bezel (218) forming a front side of the outer groove (216), the back bezel (214) forming a back side of the outer groove (216); the front baffle (218) is provided with a dispensing hole (218a) penetrating through the front inclined plane (211).

5. The opto-mechanical assembly of claim 4,

two dispensing holes (218a) are formed in the front baffle (218), and the two dispensing holes (218a) are arranged at intervals in the left-right direction; the rear baffle (214) is provided with a mounting groove (215) towards one side of a near-side critical surface of a near-side prism of the light splitting prism (30), the rear inclined surface (212) forms a bottom wall surface of the mounting groove (215), and two mounting grooves (215) are arranged at intervals in the left-right direction; the two elastic pressing blocks (22) are correspondingly embedded in the mounting grooves (215) one by one; wherein a portion of the first mating face (312) forms the proximal critical face.

6. The opto-mechanical assembly according to claim 5, characterized in that the inner wall surface of the outer groove (216) is provided with a partition plate (217) extending in the front-back direction, and the position of the partition plate (217) is between the corresponding positions of the two mounting grooves (215).

7. The opto-mechanical assembly of claim 6 wherein the mounting slot (215) is open downwardly.

8. The optical-mechanical assembly according to claim 7, wherein the mounting groove (215) includes side wall surfaces (215a) oppositely arranged in the left-right direction and a top wall surface (215b) facing downward, a position avoiding groove (215c) is provided at a connection position of the top wall surface (215b) and the two side wall surfaces (215a), and the elastic pressing block (22) is attached to the top wall surface (215b) and the side wall surfaces (215 a); the elastic pressing block (22) is fixedly bonded on the rear inclined plane (212).

9. The opto-mechanical assembly according to any of claims 1 to 8 characterized in that the back slope (212) is parallel to a proximal critical plane of a proximal prism of the beam splitter prism (30), the cross-sectional size of the spring compact (22) being constant in a direction normal to the proximal critical plane; wherein a portion of the first mating face (312) forms the proximal critical face.

10. A projection light engine comprising the light engine assembly of any one of claims 1-9.

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