CN113075844B - Projection optical machine and projector - Google Patents

Abstract

The invention discloses a projection optical machine and a projector, wherein the projection optical machine comprises a shell, a beam splitter prism, a first elastic part, two second elastic parts and a DMD (digital micromirror device) optical modulator, wherein the inner cavity of the shell comprises a rear limiting surface and a side limiting surface, the rear limiting surface is positioned at the periphery of a rear mounting port of the shell, and the side limiting surface is adjacent to a first side wall surface and faces to a second side wall surface; the beam splitter prism passes through the upper mounting port and is arranged in the inner cavity of the shell; the initial incidence surface of the beam splitter prism is arranged downwards; the inner cavity of the shell forms a first clamping cavity and a second clamping cavity on the left side and the right side of the beam splitter prism respectively; the first elastic piece is arranged in the first clamping cavity or the second clamping cavity and is connected with the shell and the left end face or the right end face of the beam splitting prism so that the beam splitting prism is abutted against the side limiting face; two second elastic pieces are respectively positioned at the lower parts of the first clamping cavity and the second clamping cavity, and the second elastic pieces are connected with the shell and the lower end of the beam splitting prism to enable the beam splitting prism to abut against the rear limiting surface. The elastic piece is easy to assemble, and the beam splitter prism is assembled stably in two transverse directions.

Description

Projection optical machine and projector

Technical Field

The invention relates to the technical field of optical projection equipment, in particular to a projection optical machine and a projector.

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, a housing of the projection optical machine has a cavity with an open top, a beam splitter prism is installed in the housing cavity along a direction perpendicular to upper and lower end surfaces of the housing, a rectangular modulation region of the DMD optical modulator, an initial incident surface of the beam splitter prism for receiving an illumination beam, and an imaging exit surface for transmitting an imaging beam to the projection lens are all perpendicular to a horizontal plane, that is, are parallel to the vertical direction. In the structure, in order to limit the beam splitter prism in the direction perpendicular to the end face of the beam splitter prism, a first elastic piece is required to be arranged between the pressing cover and the prism; in order to limit the beam splitter prism in the front-back direction and enable the beam splitter prism to abut against the rear limiting surface of the cavity, a plurality of second elastic pieces are usually adopted to directly abut against a forward setting inclined surface or an imaging emergent surface and are arranged at two ends of the beam splitter prism along the long edge of the rectangular modulation area of the DMD light modulator. However, after the spatial position of the beam splitter prism is changed to change the original orientation of the upper and lower end surfaces to the horizontal direction, if the stable assembly technical scheme in the related technology is directly applied, an installation opening and a side cover need to be additionally arranged on the side surface of the shell; and because the space for the elastic member to install on the original inclined plane or the imaging emergent plane is relatively dispersed relative to the installation space of the first elastic member, and the installation space of the second elastic member adjacent to the upstream position of the optical path is further away from the upper opening of the cavity and is also located at the bottom of the cavity, the assembly difficulty of the second elastic member and/or the components related to the elastic force transmission around the second elastic member is inevitably caused.

Disclosure of Invention

In view of the above-described situation, a main object of the present invention is to provide a compact projector and a projector that can facilitate stable attachment of a beam splitter prism in a direction perpendicular to an end surface of the beam splitter prism and toward a DMD optical modulator.

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

a projection optical machine comprises a shell, a beam splitter prism, a first elastic part, two second elastic parts and a DMD optical modulator, wherein the shell is provided with an inner cavity, an upper mounting port and a rear mounting port, and the upper mounting port and the rear mounting port are communicated with the inner cavity; the inner cavity comprises a rear limiting surface, a side limiting surface, a first side wall surface and a second side wall surface which are oppositely arranged in the left-right direction, the rear limiting surface is positioned at the periphery of the rear mounting opening, and the side limiting surface is adjacent to the first side wall surface and faces the second side wall surface;

the rear mounting port is used for mounting a DMD optical modulator; the beam splitter prism passes through the upper mounting port and is mounted in the inner cavity of the shell; the beam splitting prism comprises an initial incident surface, an emergent incident surface, a first end surface and a second end surface which are oppositely arranged in the left-right direction, the initial incident surface is arranged downwards, and the emergent incident surface faces the DMD optical modulator;

the first end face is opposite to the first side wall face, a first clamping cavity is formed between the first end face and the first side wall face, a second clamping cavity is formed between the second end face and the second side wall face, and the first clamping cavity and the second clamping cavity are longitudinally communicated to the upper mounting opening;

the first elastic piece is arranged in the first clamping cavity or the second clamping cavity and is connected with the shell and the first end surface or the second end surface adjacent to the first elastic piece so that the beam splitter prism abuts against the side limiting surface; the two second elastic pieces are respectively positioned at the lower parts of the first clamping cavity and the second clamping cavity, and the second elastic pieces are connected with the lower ends of the shell and the light splitting prism so that the light splitting prism is abutted against the rear limiting surface.

Preferably, the first elastic member is disposed in the second clamping cavity, and the first elastic member elastically abuts against the second end surface and the second side wall surface.

Preferably, a first boss is arranged on the second side wall surface, an accommodating groove is formed in one surface, facing the second end surface, of the first boss, and the first elastic piece is embedded in the accommodating groove and elastically abutted to the second end surface.

Preferably, the first boss and the accommodating groove extend in the vertical direction to form a long strip shape, the first elastic piece is in the long strip shape, the length direction of the first elastic piece is consistent with the vertical direction, and the first elastic piece is embedded in the accommodating groove from top to bottom.

Preferably, a second boss is arranged on the first side wall surface, and the side limiting surface is formed on one surface of the second boss facing the first end surface.

Preferably, the second elastic element is located at the front side of the second boss, and a guide inclined plane is formed at the joint of the upper end surface of the second boss and the front side surface of the second boss.

Preferably, the projection optical engine further includes two bottom supports, and the two bottom supports are respectively located at the lower portions of the first clamping cavity and the second clamping cavity and are respectively and fixedly connected to the first end face and the second end face;

third bosses are arranged on the first side wall surface and the second side wall surface, the third bosses are positioned at the front sides of the adjacent bottom supporting pieces, and the bottom supporting pieces of the second clamping cavities are positioned at the front sides of the first convex strips; the second elastic piece is elastically abutted against the third boss and the bottom support piece.

Preferably, the bottom support piece includes that the side links board and preceding baffle, two the bottom support piece the side links the board and pastes respectively and bonds and be fixed in first terminal surface and second terminal surface, preceding baffle with the side links deviating from of board the one side of beam splitting prism is connected, preceding baffle has the face that sets up forward, the third boss have with the relative trailing flank that sets up of preceding baffle, second elastic component elasticity butt in the trailing flank of third boss and the preceding face of preceding baffle.

Preferably, the projection optical machine further includes a pressing cover and a third elastic member, the pressing cover covers the upper mounting opening, the third elastic member is disposed between the pressing cover and the beam splitting prism, the pressing cover has a first backward fitting surface, the upper end of the beam splitting prism has a second backward fitting surface, and the third elastic member elastically abuts against the first fitting surface and the second fitting surface so that the beam splitting prism abuts against the rear limiting surface.

A projector comprises a main board and the projection optical machine, wherein the main board is electrically connected with the DMD optical modulator.

The projection optical machine of the invention is provided with the first clamping cavity and the second clamping cavity which are communicated with the upper mounting port, so that the first elastic element can be mounted to the first clamping cavity or the second clamping cavity from top to bottom, and the mounting port does not need to be formed from the side wall of the shell for mounting the first elastic element to the inner cavity of the shell; and because the first terminal surface and the second terminal surface of beam splitting prism form the side wall face of first double-layered chamber and second double-layered chamber correspondingly, so, first elastic component is after connecting the casing, and the elasticity of first elastic component can direct action on first terminal surface or second terminal surface to can not rely on the side cap to realize the firm assembly of beam splitting prism on the direction of perpendicular to first terminal surface or second terminal surface. Therefore, in combination, the two second elastic pieces can be respectively installed by utilizing the first clamping cavity and the second clamping cavity to realize the purpose of stabilizing the limiting beam splitting prism in the direction close to the DMD optical modulator, wherein one second elastic piece and the first elastic piece share one clamping cavity, so that the related stable structure is compact; and the second elastic piece and/or the related parts for realizing the elastic force transmission around the second elastic piece can be installed to the first clamping cavity and the second clamping cavity from top to bottom like the first elastic piece, and the side covers are not needed to be matched, so that the stable structure of the light splitting prism in two directions is easy to assemble.

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

Drawings

Preferred embodiments of a projector optical machine and a projector according to the present invention will be described below with reference to the accompanying drawings. In the figure:

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

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

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

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

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

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

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

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

FIG. 9 is a schematic view of the mating structures of the beam splitter prism, the shoe assembly, and the gland assembly of FIG. 8;

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

FIG. 11 is a schematic diagram of the structure of FIG. 8 with the collet assembly, the gland assembly, and the DMD light modulator removed;

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

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

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

FIG. 15 is a top view of the structure of FIG. 8 with the cover press assembly and DMD light modulator removed;

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

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

FIG. 18 is a schematic cross-sectional view taken along line XVIII-XVIII in FIG. 15;

fig. 19 is a partially enlarged schematic view of a portion E in fig. 18.

The reference numbers illustrate:

Detailed Description

Referring to fig. 4, fig. 8, and fig. 15 to fig. 19, in an embodiment, the optical projection engine of the present invention includes a housing 10, a beam splitter prism 20, a first elastic member 31, and two second elastic members 32, wherein the housing 10 has an inner cavity 111, and an upper mounting port 112 and a rear mounting port 113 which are communicated with the inner cavity 111; the inner cavity 111 comprises a rear limiting surface 111a, a side limiting surface 111b, a first side wall surface 111c and a second side wall surface 111d which are oppositely arranged in the left-right direction, the rear limiting surface 111a is positioned at the periphery of the rear mounting opening 113, and the side limiting surface 111b is adjacent to the first side wall surface 111c and faces the second side wall surface 111 d;

the rear mounting port 113 is used for mounting the DMD light modulator 60; the beam splitter prism 20 is arranged in the inner cavity 111 of the shell 10 through the upper mounting port 112; the beam splitter prism 20 includes an initial incident surface 211, an exit incident surface 212, and a first end surface 214 and a second end surface 215 that are provided opposite to each other in the left-right direction, the initial incident surface 211 being disposed downward, and the exit incident surface 212 facing the DMD light modulator 60;

the first end face 214 is opposite to the first side wall face 111c, a first clamping cavity 114 is formed between the first end face 214 and the first side wall face 111c, a second clamping cavity 115 is formed between the second end face 215 and the second side wall face 111d, and the first clamping cavity 114 and the second clamping cavity 115 penetrate through the upper mounting opening 112 along the longitudinal direction;

the first elastic member 31 is disposed in the first clamping cavity 114 or the second clamping cavity 115, and the first elastic member 31 connects the housing 10 and the first end surface 214 or the second end surface 215 adjacent to the first elastic member 31, so that the splitting prism 20 abuts against the side limiting surface 111 b; the two second elastic members 32 are respectively located at the lower portions of the first clamping cavity 114 and the second clamping cavity 115, and the second elastic members 32 are connected to the housing 10 and the lower end of the beam splitter prism 20 to make the beam splitter prism 20 abut against the rear limiting surface 111 a.

In this embodiment, the housing 10 is used to provide support for various components inside or outside the housing, and is a relatively complex component of the projection optical device. Specifically, referring to fig. 1 to 6, the optical projection engine may further include a projection lens 70, an optical illumination system, and a reflector 90; the optical illumination system includes a light source (81a, 81b, 81c, 81d), a three-color modulation assembly including a collimating lens group (821a, 821b, 821c), a dichroic mirror (822a, 822b), a relay lens 823, and a fly-eye lens group 824, and a condensing lens group (83a, 83 b).

The housing 10 may be an integral structure or a separate structure, and specifically, may include a first housing 11 and a second housing 12, and the inner cavity 111 and an upper mounting port 112 and a rear mounting port 113 communicating with the inner cavity 111 are formed in the first housing 11. The optical illumination system, the reflector 90 and the beam splitter prism 20 may be laid on the housing 10 along the same plane, and may be installed on the housing 10 along more than one plane, for example, the optical illumination system, the reflector 90 are installed to the second housing 12 along a horizontal plane, and the beam splitter prism 20 is installed to the first housing 11 from top to bottom along a vertical plane, so that the height of the whole projection light machine may be reduced and the effect of entering the illumination light path along the long side perpendicular to the DMD light modulator 60 may be achieved. The housing 10 further includes a front mounting opening (not labeled) communicated with the inner cavity 111, and the DMD light modulator 60 and the projection lens 70 are respectively mounted at the front mounting opening and the rear mounting opening 113; the bottom wall surface of the cavity 111 is formed with a lower limiting surface (not shown) adjacent to the left and right wall surfaces, and the bottom surface of the prism 20 abuts against the lower limiting surface.

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, 8-10, and 15-19, in an embodiment, the beam splitter prism 20 is used with a DMD digital micromirror to convert the illumination light path into the projection light path under the action of the DMD light modulator 60. Specifically, the splitting prism 20 includes a near side prism 21 and a far side prism 22, the initial incident surface 211, the exit incident surface 212, the first end surface 214 and the second end surface 215 are all formed on the near side prism 21, and the near side prism 21 further includes a near side critical surface 213; the initial entrance face 211, the exit entrance face 212 and the proximal critical face 213 are all located between the first end face 214 and the second end face 215; the far-side prism 22 comprises a far-side critical surface 221 and an imaging emergent surface 222 facing the projection lens 70, and the top of the far-side prism 22 is provided with an emergent connecting surface 224 inclining backwards from top to bottom; the distal prism 22 further includes a third end face 225, a fourth end face 226, wherein the third end face 225 is flush with the first end face 214 and the fourth end face 226 is flush with the second end face 215; the distal critical surface 221 is glued to said proximal critical surface 213 with an air gap formed between them. In order to reduce the cost, the proximal prism 21 and the distal prism 22 are made of materials with the same refractive index, and the two prisms have the same shape, so that the molding dies can be shared. Initial incidence plane 211 faces downward and is bonded to the lower limiting plane, emission connection plane 224 is adjacent to near-side critical plane 213, the upper portion of near-side critical plane 213 protrudes from emission connection plane 224, and near-side critical plane 213 and emission connection plane 224 enclose a recess with an upward opening.

Referring to fig. 1 to 6 again, the DMD light modulator 60 is used to control the on/off of the light beam according to the received image signal, thereby realizing image display. The projection lens 70 is used to enlarge and project the image modulated by the DMD light modulator 60 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 and select dichroic mirror, colour wheel, fluorescence wheel and X prism etc. again according to the difference of light source.

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

Referring to fig. 15 to 19 again, the first elastic member 31 and the second elastic member 32 may apply an elastic force to the beam splitter prism 20 by self-compression or by self-extension. For example, if the first elastic member 31 is disposed in the first clamping cavity 114, i.e. located on the same side of the splitting prism 20 together with the side limiting surface 111b, after the first elastic member 31 is mounted, one end is connected to the housing 10, and the other end is connected to the first end surface 214, so that the elastic force is applied to the splitting prism 20 by using its own stretching state, so that the splitting prism 20 abuts against the side limiting surface 111 b. The second elastic member 32 may be directly connected to the lower end of the prism 20, or may be indirectly connected to the lower end of the prism 20 via a third member, as long as the elastic force can be reliably transmitted.

The projection light machine of the present invention is provided with the first clamping cavity 114 and the second clamping cavity 115 penetrating through the upper mounting port 112, so that the first elastic member 31 can be mounted to the first clamping cavity 114 or the second clamping cavity 115 from top to bottom, and thus, it is not necessary to provide a mounting port from the side wall of the housing 10 for the first elastic member 31 to be mounted to the inner cavity 111 of the housing 10; and because the first end surface 214 and the second end surface 215 of the beam splitting prism 20 correspondingly form the side wall surfaces of the first clamping cavity 114 and the second clamping cavity 115, after the first elastic member 31 is connected with the housing 10, the elastic force of the first elastic member 31 can directly act on the first end surface 214 or the second end surface 215, so that the beam splitting prism 20 can be stably assembled in the direction perpendicular to the first end surface 214 or the second end surface 215 without depending on a side cover. In combination, therefore, two second elastic members 32 can be respectively installed by using the first clamping cavity 114 and the second clamping cavity 115 to realize the stabilization of the limiting beam splitting prism 20 in the direction close to the DMD light modulator 60, wherein one second elastic member 32 and the first elastic member 31 share one clamping cavity, so that the related stabilization structure is compact; and the second elastic member 32 itself and/or components related to the transmission of the elastic force around the second elastic member 32 can be installed to the first and second clamping cavities 114 and 115 from top to bottom like the first elastic member 31, without using a side cover to cooperate, thereby making it easy to assemble the stable structure of the prism 20 in both directions.

Further, referring to fig. 9 to 19, in an embodiment, the first elastic member 31 is disposed in the second clamping cavity 115, and the first elastic member 31 elastically abuts against the second end surface 215 and the second side wall surface 111 d.

In the present embodiment, the first elastic member 31 applies an elastic force to the beam splitter prism 20 by self-compression, and the assembly of the present embodiment is easier than that of the self-tension method, and the first elastic member 31 only needs to be compressed between the second end surface 215 and the second side wall surface 111 d.

Further, referring to fig. 13 to 18, in an embodiment, the second sidewall 111d is provided with a first boss 116, a receiving groove 116a is provided on a surface of the first boss 116 facing the second end surface 215, and the first elastic member 31 is embedded in the receiving groove 116a and elastically abuts against the second end surface 215.

In this embodiment, it can be understood that, when a sufficient distance is maintained between the second sidewall surface 111d and the second end surface 215, the volume or width of the second clamping cavity 115 can be ensured to facilitate the installation of other components. The first boss 116 is arranged to well support the first elastic member 31 while achieving the above purpose, so as to prevent the first elastic member 31 from being out of position; or the first elastic member 31 may be located closer to the prism 20 as a whole, so that the corresponding stable structure may be more compact.

Further, the first bosses 116 and the receiving grooves 116a both extend in the up-down direction to form a strip shape, the first elastic members 31 are in the strip shape, the length direction of the first elastic members 31 is consistent with the up-down direction, and the first elastic members 31 are embedded in the receiving grooves 116a from top to bottom.

In this embodiment, the first elastic member 31 is arranged in a long strip shape, which is beneficial to apply evenly distributed elastic force to the beam splitting prism 20. And in position, the length direction of the first elastic member 31 is consistent with the assembling direction from top to bottom, so that the convenience in assembling the first elastic member 31 is also improved.

Further, referring to fig. 11, 12, 15 and 18, in an embodiment, the first side wall 111c is provided with a second boss 117, and the side limiting surface 111b is formed on a surface of the second boss 117 facing the first end surface 214.

In the present embodiment, similarly to the embodiment in which the first projecting strip is provided, by providing the second projection 117 such that the side restriction surface 111b is closer to the prism 20 than the first side wall surface 111c, it is advantageous to ensure the volume and the width in the left-right direction of the first nip 114 to facilitate the assembly of each component including the prism 20.

Further, the second elastic member 32 is located at the front side of the second boss 117, and a guide slope 117a is formed at the connection of the upper end surface of the second boss 117 and the front side surface of the second boss 117.

In this embodiment, by providing the guide slope 117a, if the initial position of the second elastic member 32 or the third component connected between the second elastic member 32 and the splitting prism 20 is biased toward the DMD light modulator 60 when the second elastic member 32 or the third component is assembled independently or with the splitting prism 20 from top to bottom, the assembled corresponding component can be returned to the correct position under the guiding action of the guide slope 117 a.

Further, referring to fig. 4, 9 to 19, in an embodiment, the projection optical engine further includes two bottom supports 40, and the two bottom supports 40 are respectively located at lower portions of the first clamping cavity 114 and the second clamping cavity 115 and respectively fixedly connected to the first end surface 214 and the second end surface 215;

the first side wall surface 111c and the second side wall surface 111d are both provided with a third boss 118, the third boss 118 is positioned at the front side of the adjacent bottom bracket 40, and the bottom bracket 40 in the second clamping cavity 115 is positioned at the front side of the first convex strip; the second elastic element 32 elastically abuts against the third boss 118 and the bottom bracket 40.

In this embodiment, the elastic force of the second elastic member 32 is transmitted by the base member 40, and the compression of the second elastic member 32 itself is utilized to provide the elastic force, which is beneficial to simplify the assembly of the second elastic member 32. For example, the base member 40 may be fixed to the splitting prism 20, then assembled with the splitting prism 20 to the inner cavity 111 of the housing 10, and finally the second elastic member 32 is clamped between the third boss 118 and the base member 40 to abut the splitting prism 20 against the rear limiting surface 111 a.

Further, the bottom support member 40 includes a side connecting plate 41 and a front baffle 42, the side connecting plates 41 of the two bottom support members 40 are respectively attached and adhesively fixed to the first end surface 214 and the second end surface 215, the front baffle 42 is connected with a surface of the side connecting plate 41 departing from the beam splitter 20, the front baffle 42 has a surface arranged forward, the third boss 118 has a rear side surface arranged opposite to the front baffle 42, and the second elastic member 32 elastically abuts against the rear side surface of the third boss 118 and the front surface of the front baffle 42.

In this embodiment, the side connecting plate 41 is provided to increase the bonding area between the base member 40 and the splitting prism 20, thereby increasing the connection strength between the base member 40 and the splitting prism 20. The provision of the front baffle 42 facilitates providing a larger supporting area for the second elastic member 32, so that the second elastic member 32 can be more smoothly compressed and clamped between the front baffle 42 and the third boss 118.

Further, referring to fig. 1 to 4 and fig. 7 to 9, in an embodiment, the optical projection engine further includes a pressing cover 50 and a third elastic member 33, the pressing cover 50 covers the upper mounting opening 112, the third elastic member 33 is disposed between the pressing cover 50 and the beam splitter prism 20, the pressing cover 50 has a first mating surface 51 facing backward, the upper end of the beam splitter prism 20 has a second mating surface 213 facing backward, and the third elastic member 33 elastically abuts against the first mating surface 51 and the second mating surface 213 so that the beam splitter prism 20 abuts against the rear limiting surface 111 a.

In this embodiment, the gland 50 and the upper mounting port 112 cooperate to seal the inner cavity 111 of the housing 10; further, the provision of the first mating face 51 supporting the third elastic member 33 in the front-rear direction by the pressing cover 50 and the action of the third elastic member 33 on the second mating face 213 in the compressed state facilitate both the application of a backward elastic force to the splitting prism 20 at the upper end of the splitting prism 20 to more firmly abut the splitting prism 20 against the rear stopper face 111a and the assembly of the third elastic member 33 itself. In a specific embodiment, the second matching surface 213 is formed at the upper portion of the near-side critical surface 213 of the near-side prism 21 exposed at the upper end of the far-side prism 22, so that since the near-side critical surface 213 is inclined with respect to the up-down direction, i.e., inclined forward from the top to the bottom, the elastic force of the third elastic member 33 can push the splitting prism 20 backward and can push the splitting prism 20 downward against the lower limiting surface. It will be appreciated that a third component may be provided to fixedly attach to the upper end of the beam splitter prism 20 to provide a second mating surface, as with the base member 40.

The invention further provides a projector, which comprises a main board and the projection optical machine, wherein the main board is electrically connected with the DMD optical modulator 60. The main board is used for driving the micro-mirrors on the DMD light modulator 60 to deflect according to the image signal, so as to make and break the light beams corresponding to the image pixels, and further convert the illumination light beams into imaging light beams. The specific structure of the optical projection machine refers to the above embodiments, and since the optical projection machine adopts all technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are also 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 embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the invention.

Claims (10)

1. A projection optical machine comprises a shell (10), a beam splitter prism (20), a first elastic part (31), two second elastic parts (32) and a DMD optical modulator (60),

the shell (10) is provided with an inner cavity (111), an upper mounting port (112) communicated with the inner cavity (111) and a rear mounting port (113); the inner cavity (111) comprises a rear limiting surface (111a), a side limiting surface (111b), a first side wall surface (111c) and a second side wall surface (111d) which are oppositely arranged in the left-right direction, the rear limiting surface (111a) is positioned at the periphery of the rear mounting opening (113), and the side limiting surface (111b) is adjacent to the first side wall surface (111c) and faces the second side wall surface (111 d);

the rear mounting port (113) is used for mounting a DMD optical modulator (60); the light splitting prism (20) is installed in an inner cavity (111) of the shell (10) through the upper installation opening (112); the beam splitting prism (20) comprises an initial incident surface (211), an emergent incident surface (212), a first end surface (214) and a second end surface (215) which are oppositely arranged in the left-right direction, wherein the initial incident surface (211) is arranged downwards, and the emergent incident surface (212) faces the DMD optical modulator (60);

the first end face (214) is opposite to the first side wall face (111c), a first clamping cavity (114) is formed between the first end face (214) and the first side wall face (111c), a second clamping cavity (115) is formed between the second end face (215) and the second side wall face (111d), and the first clamping cavity (114) and the second clamping cavity (115) penetrate through the upper mounting opening (112) along the longitudinal direction;

the first elastic piece (31) is arranged in the first clamping cavity (114) or the second clamping cavity (115), and the first elastic piece (31) is connected with the shell (10) and the first end surface (214) or the second end surface (215) adjacent to the first elastic piece (31) so that the light splitting prism (20) abuts against the side limiting surface (111 b); the two second elastic pieces (32) are respectively positioned at the lower parts of the first clamping cavity (114) and the second clamping cavity (115), and the second elastic pieces (32) are connected with the lower ends of the shell (10) and the splitting prism (20) so that the splitting prism (20) abuts against the rear limiting surface (111 a).

2. The optical projection engine according to claim 1, wherein the first elastic member (31) is disposed in the second clamping cavity (115), and the first elastic member (31) elastically abuts against the second end surface (215) and the second side wall surface (111 d).

3. The optical projection engine according to claim 2, wherein the second side wall surface (111d) is provided with a first protrusion (116), a surface of the first protrusion (116) facing the second end surface (215) is provided with a receiving groove (116a), and the first elastic member (31) is embedded in the receiving groove (116a) and elastically abuts against the second end surface (215).

4. The optical projection engine according to claim 3, wherein the first protrusion (116) and the receiving groove (116a) are both elongated in a vertical direction, the first elastic member (31) is elongated, a length direction of the first elastic member (31) is substantially aligned with the vertical direction, and the first elastic member (31) is embedded in the receiving groove (116a) from top to bottom.

5. The optical projection engine according to claim 3 or 4, characterized in that the first side wall surface (111c) is provided with a second boss (117), and the side limiting surface (111b) is formed on a surface of the second boss (117) facing the first end surface (214).

6. The light engine of claim 5, characterized in that the second elastic member (32) is located at the front side of the second boss (117), and a guide slope (117a) is formed at the connection of the upper end surface of the second boss (117) and the front side surface of the second boss (117).

7. The light engine of claim 3 or 4,

the projection optical engine further comprises two bottom supporting pieces (40), wherein the two bottom supporting pieces (40) are respectively positioned at the lower parts of the first clamping cavity (114) and the second clamping cavity (115) and are respectively and fixedly connected to the first end surface (214) and the second end surface (215);

third bosses (118) are arranged on the first side wall surface (111c) and the second side wall surface (111d), the third bosses (118) are positioned at the front sides of the adjacent bottom support pieces (40), and the bottom support pieces (40) of the second clamping cavities (115) are positioned at the front sides of the first convex strips; the second elastic piece (32) is elastically abutted against the third boss (118) and the bottom support piece (40).

8. The projection optical engine according to claim 7, wherein the bottom bracket (40) includes a side connecting plate (41) and a front baffle (42), the side connecting plates (41) of the two bottom bracket (40) are respectively attached and adhesively fixed to the first end surface (214) and the second end surface (215), the front baffle (42) is connected to a surface of the side connecting plate (41) facing away from the beam splitter prism (20), the front baffle (42) has a plate surface arranged forward, the third boss (118) has a rear side surface arranged opposite to the front baffle (42), and the second elastic member (32) elastically abuts against the rear side surface of the third boss (118) and the front plate surface of the front baffle (42).

9. The optical engine according to claim 1, further comprising a cover (50) and a third elastic member (33), wherein the cover (50) covers the upper mounting opening (112), the third elastic member (33) is disposed between the cover (50) and the beam splitter prism (20), the cover (50) has a first mating surface (51) facing backward, the upper end of the beam splitter prism (20) has a second mating surface (213) facing backward, and the third elastic member (33) elastically abuts against the first mating surface (51) and the second mating surface (213) to make the beam splitter prism (20) abut against the rear limiting surface (111 a).

10. A projector comprising a motherboard and a light engine according to any of claims 1 to 9, the motherboard being electrically connected to the DMD light modulator (60).

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