CN113075843B - 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, an optical illumination system, a reflector, a beam splitter prism, a DMD (digital micromirror device) optical modulator and a projection lens, wherein the optical illumination system comprises a light source and a three-color modulation assembly; the shell comprises an upper shell and a lower shell, a first containing cavity and a second containing cavity are respectively formed in the lower shell and the upper shell, and an upper splicing port of the lower shell is butted with a lower splicing port of the upper shell; the light source is arranged on the lower shell, and the three-color modulation assembly is arranged in the first containing cavity; the reflector is arranged in the first cavity through the upper splicing opening; the reflector is used for reflecting the three-color light modulated by the three-color modulation assembly towards the upper side of the upper splicing interface; the projection lens is connected with the upper shell, and the beam splitter prism is arranged in the second accommodating cavity; the initial incidence surface of the beam splitter prism faces the lower splicing interface, and the cross section of the beam splitter prism is perpendicular to the optical axis plane of the three-color modulation assembly at the upstream of the reflecting mirror. The projection light machine can emit the illumination light beams from the long edge of the modulation area of the DMD light modulator, and has a low height and a compact structure.

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 projection light machine, the core component of the projection light machine comprises a shell, an optical illumination system, a reflector, a beam splitter prism, a DMD (digital micromirror device) light modulator and a projection lens, and the optical illumination system comprises a light source and a three-color modulation component.

The existing projection light machine is usually of a horizontal structure, a three-color modulation assembly, a reflector and a light splitting prism are often tiled along the same plane (the horizontal plane in the use state) and installed in a shell, the shell is usually designed to be of a single structure in order to adapt to the structure, and at least the three-color modulation assembly and the light splitting prism are installed in the inner cavity of the shell along the same direction. The existing structure can be directly adapted to the DMD light modulator used for modulating wide-screen pictures, because the horizontal illumination light beam processed by the beam splitter prism can be incident from the short side of the rectangular modulation area of the DMD light modulator.

However, there is also a DMD optical modulator in which the rectangular modulation region has a long side as the incident side of the illumination light beam, and in this case, if the optical element arrangement structure of the existing projector is directly applied to modulate a wide screen image, the corresponding housing needs to be vertically turned by 90 ° and the color modulation component, the reflecting mirror and the splitting prism are arranged along the same vertical plane. The size in the vertical direction is inevitably increased, the gravity center position of the projection light machine is increased, and the practicability of the corresponding projector is influenced if the projection light machine is applied to the projector.

Disclosure of Invention

In view of the above situation, a main object of the present invention is to provide a projector optical device and a projector that can make an illumination light beam incident from a long side of a modulation region of a DMD optical modulator and have a compact structure with a low housing height.

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

a projection optical machine comprises a shell, an optical illumination system, a reflector, a beam splitter prism, a DMD optical modulator and a projection lens, wherein the optical illumination system comprises a light source and a three-color modulation assembly;

the shell comprises an upper shell and a lower shell, a first containing cavity is formed in the lower shell, and an upper splicing port communicated with the first containing cavity is formed in the top of the lower shell; a second cavity is formed in the upper shell, a lower splicing port communicated with the first cavity is formed in the bottom of the upper shell, and the lower splicing port is in butt joint with the upper splicing port;

the light source is arranged on the lower shell, and the three-color modulation assembly is arranged in the first cavity; the upper splicing opening has a size allowing the reflector to pass through, and the reflector passes through the upper splicing opening and is installed in the first cavity; the reflector is used for reflecting the three-color light modulated by the three-color modulation assembly towards the upper side of the upper splicing opening;

the projection lens is connected with the upper shell, and the beam splitter prism is arranged in the second accommodating cavity; the initial incidence surface of the light splitting prism faces the lower splicing interface to receive the light reflected by the reflecting mirror, and the cross section of the light splitting prism is perpendicular to the optical axis plane of the three-color modulation assembly at the upstream of the reflecting mirror.

Preferably, the projection optical machine further includes a support member for supporting the reflector, a guide protrusion is disposed on a side edge of the support member, the guide protrusion extends toward a side wall of the lower housing, a guide groove is disposed on the side wall of the lower housing corresponding to the guide protrusion, and the guide groove extends in an up-down direction and penetrates through an edge of the upper splicing port.

Preferably, the bottom of the guide groove is provided with a positioning surface, and the guide protrusion abuts against the positioning surface.

Preferably, the support member is formed with a handle adjacent to the upper splice opening.

Preferably, a lower opening with a downward opening is formed at the bottom of the lower housing, the three-color modulation assembly is mounted in the first cavity through the lower opening, and the housing further includes a lower cover covering the lower opening of the lower housing;

the bottom of the lower shell comprises a limiting flange, and the limiting flange extends from the side wall of the lower shell and is positioned below the lower ends of the supporting piece and the reflector;

the limiting flange limits a part of the lower opening edge, and the lower ends of the supporting piece and the reflector are located on one side, far away from the center of the lower opening, of the lower opening edge.

Preferably, the projection optical machine further comprises a first sealing ring, the first sealing ring is arranged along the edge of the lower opening to be in sealing connection with the edge of the lower opening, two opposite surfaces of the lower cover and the limiting flange are in sealing fit with the first sealing ring, the inner side surface of the limiting flange is provided with a clearance groove, and the lower end of the supporting piece extends into the clearance groove.

Preferably, the side wall of the lower housing adjacent to the support member includes a vertical wall located at an upper portion and an inclined wall inclined from a lower edge of the vertical wall to a direction adjacent to the three-color modulation assembly from top to bottom; the reflector is arranged along the inclined wall, and the upper end of the support is adjacent to the vertical wall;

the projection optical machine further comprises a reflector adjusting assembly, the reflector adjusting assembly comprises a connecting piece and a plurality of adjusting pieces, the connecting piece is used for connecting the supporting piece and enabling the supporting piece to be fixed relative to the lower shell in advance, and the adjusting pieces are used for adjusting the distance between each part of the supporting piece and the inclined wall.

Preferably, the mirror adjustment assembly further comprises an adaptor, the adaptor being located between the inclined wall and the support, and the adaptor having a modulus of elasticity greater than that of the inclined wall;

the inclined wall is provided with a first avoiding hole and a plurality of second avoiding holes; the adapter is provided with a first connecting hole and a plurality of adjusting holes, the first connecting hole is arranged corresponding to the first avoiding hole, and the plurality of adjusting holes are arranged corresponding to the plurality of second avoiding holes one to one;

the support piece is provided with a second connecting hole corresponding to the first connecting hole; the connecting piece penetrates through the first connecting hole and the second connecting hole to fixedly connect the supporting piece and the adapter piece; the adjusting pieces are arranged in the adjusting holes in a one-to-one correspondence mode, and the adjusting pieces can movably act on the supporting pieces along the axis of the adjusting holes so that the supporting pieces can swing relative to the inclined wall.

Preferably, the projection lens is located in a concave portion formed by the top surface of the lower shell and the side surface of the upper shell in an enclosing manner, and the downward projection of the projection lens falls on the top surface of the lower shell;

the top surface of the lower shell is provided with a first annular groove surrounding the upper splicing opening, the bottom surface of the upper shell is provided with a second annular groove surrounding the lower splicing opening, and the first annular groove and the second annular groove are correspondingly arranged in position; the projection optical machine further comprises a second sealing ring, and the second sealing ring is installed in the first annular groove and the second annular groove.

The invention also provides a projector, which comprises a main control board and a projection optical machine, wherein the projection optical machine is the projection optical machine, and the main control board is electrically connected with the light source and the DMD optical modulator.

The casing can be divided into an upper casing and a lower casing which are butted up and down, so that the reflector arranged on the lower casing can reflect three color lights which are approximately horizontal light beams upwards, and the light beams processed by the beam splitter prism can directly enter through the long edge of the modulation area of the DMD optical modulator, thereby ensuring that the DMD optical modulator modulates a rectangular picture. Because the light beam received by the reflector is approximately horizontal, the light source and the three-color modulation assembly can still be arranged and installed on the lower shell along the horizontal plane, and therefore the overall height of the projection light machine is reduced. In addition, because the lower splicing port is utilized for installing the reflector, the reflector does not need to be installed by arranging an installation port at other positions of the lower shell, so that the shell structure of the projector is more compact.

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 light 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 front view of a preferred embodiment of a projection light according to the present invention;

FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 1;

FIG. 3 is a schematic top view of the projector of FIG. 1;

FIG. 4 is a schematic cross-sectional view taken along line IV-IV of FIG. 3;

fig. 5 is a schematic view of a partially enlarged structure at a point a in fig. 4, in which fig. 5.1 is an enlarged view of a splicing position of the upper casing and the lower casing, and fig. 5.2 is an enlarged view of a covering position of the lower cover and the lower opening;

FIG. 6 is a schematic perspective view of the optical projection engine of FIG. 1;

FIG. 7 is an exploded view of the optical projector of FIG. 6;

FIG. 8 is a partial enlarged view of the structure at B in FIG. 7;

FIG. 9 is an exploded view of the partial structure at B in FIG. 7;

FIG. 10 is an enlarged partial view of the structure at C in FIG. 9;

FIG. 11 is a schematic perspective view of the optical projection engine of FIG. 1 at another angle;

FIG. 12 is a schematic view of a portion of the structure of FIG. 11 at D;

FIG. 13 is an exploded view of the partial structure of FIG. 12;

FIG. 14 is a schematic front view of a partial structure of FIG. 12;

FIG. 15 is a schematic sectional view taken along line XV-XV.

The reference numbers indicate:

Detailed Description

Referring to fig. 1 to 4, in an embodiment, the optical projection engine of the present invention includes a housing 10, an optical illumination system 20, a reflector 30, a beam splitter prism 40, a dmd optical modulator 50, and a projection lens 60, where the optical illumination system 20 includes a light source (21a, 21b,21c, 21d) and a tristimulus modulation element;

the shell 10 comprises an upper shell 11 and a lower shell 12, a first accommodating cavity 121 is formed in the lower shell 12, and an upper splicing opening 122 communicated with the first accommodating cavity 121 is formed in the top of the lower shell 12; a second cavity 111 is formed inside the upper shell 11, a lower splicing port 112 communicated with the first cavity 121 is formed at the bottom of the upper shell 11, and the lower splicing port 112 is in butt joint with the upper splicing port 122;

light sources (21a, 21b,21c, 21d) are mounted in the lower housing 12, and a tristimulus modulation assembly is mounted in the first cavity 121; the upper splicing opening 122 has a size for the reflector 30 to pass through, and the reflector 30 is installed in the first cavity 121 through the upper splicing opening 122; the reflector 30 is used for reflecting the three-color light modulated by the three-color modulation assembly towards the upper side of the upper splicing interface 122;

the projection lens 60 is connected with the upper shell 11, and the beam splitter prism 40 is installed in the second cavity 111; the initial entrance surface of the beam splitter prism 40 faces the lower pin interface 112 to receive the light reflected by the reflector 30, and the cross section of the beam splitter prism 40 is perpendicular to the optical axis plane of the three-color modulation assembly upstream of the reflector 30.

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 system. Specifically, the upper housing 11 and the lower housing 12 of the housing 10 may be formed by a molding process, such as integral injection molding or metal die casting, and if the metal die casting is used, the material removing finish process may be performed on the basis of the molding process. For convenience of maintenance or adjustment, the upper housing 11 and the lower housing 12 are detachably connected, specifically, a fixing hole may be disposed on the periphery of the lower connection port 112, and a through hole corresponding to the upper connection port 122 is disposed on the periphery of the lower connection port, and then the upper housing 11 and the lower housing 12 may be fixedly connected by passing a bolt through the through hole and screwing the bolt into the fixing hole.

The optical illumination system 20 is used to produce three parallel colors of light, not strictly parallel, but generally parallel beams that allow for some angular error. The light sources of the optical illumination system 20 are specifically LED light sources (21a, 21b,21c, 21d). In alternative embodiments of the optical illumination system 20, the light source may be an RGB laser, a mixed light laser, or 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. Specifically, the three-color modulation assembly includes a three-color modulation assembly including collimating lens groups (221a, 221b,221c, 221d), dichroic mirrors (222a, 222b), a relay lens 223, and a fly-eye lens group 224.

The light emitted from the light sources (21a, 21b,21c, 21d) of the optical illumination system 20 is internally adjusted to output parallel light, and the mirror 30 changes the propagation direction of the parallel light. The optical illumination system 20 further comprises a converging lens group (23a, 23b) 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 (23a, 23b) and then irradiated onto the reflecting mirror 30, and further transmitted to the free-form surface lens on the upper side of the converging lens group (23a, 23b) with changing direction. The light converted by the converging lens groups (23a, 23b) is transmitted to the initial incident surface of the beam splitter prism 40. The cross section of the beam splitter prism 40 is perpendicular to the initial incident surface, and when the beam splitter prism 40 is TIR (Total Internal Reflection) and is formed by gluing two prisms, the cross section of the beam splitter prism 40 is also perpendicular to the gluing surface of the two prisms.

The DMD light modulator 50 is used to control the on/off of the light beam according to the received image signal, thereby realizing image display. The beam splitter prism 40 is matched with the DMD digital micromirror to realize a more compact structure, and converts the projection light path into a projection light path under the action of the DMD optical modulator 50. The projection lens 60 is used to enlarge and transmit the image modulated by the DMD light modulator 50 onto the screen.

In the optical projection engine of the present invention, the housing 10 may be configured as a split upper housing 11 and a lower housing 12 which are butted up and down, so that the reflector 30 disposed on the lower housing 12 may reflect the substantially horizontal three-color light, i.e., the illumination light beam, upward, so that the illumination light beam processed by the beam splitter prism 40 may directly enter through the long side of the modulation region of the DMD optical modulator 50, thereby ensuring that the DMD optical modulator 50 modulates a rectangular picture. Since the light beam received by the mirror 30 is substantially horizontal, the light sources (21a, 21b,21c, 21d) and the three-color modulation assembly can still be mounted on the lower housing 12 along the horizontal plane arrangement, thereby reducing the overall height of the projection light engine. In addition, since the lower splicing opening 112 is used for installing the reflector 30, the reflector 30 does not need to be installed by opening an installation opening at other positions of the lower shell 12, so that the shell 10 of the projector is more compact in structure.

Further, referring to fig. 7 to 10 and fig. 13 together, in an embodiment, the projection optical system further includes a support 70 for carrying the reflector 30, a guide protrusion 71 is disposed on a side edge of the support 70, the guide protrusion 71 extends toward a side wall of the lower housing 12, the side wall of the lower housing 12 is provided with a guide groove 123 corresponding to the guide protrusion 71, and the guide groove 123 extends in the up-down direction and penetrates through an edge of the upper splice opening 122.

In this embodiment, the reflector 30 cannot be directly fixed, because the reflector 30 is a thin-walled structure and is usually made of a brittle material, the support member 70 needs to be disposed for carrying, for example, the reflector 30 is adhered to the support member 70, and for facilitating glue storage, a plurality of glue storage grooves may be formed on the carrying surface of the support member 70. In order to enlarge the bonding area and reduce the volume, the support 70 is generally provided in a plate shape, so that the reflecting mirror 30 and the support 70 can be assembled to each other in a stacked manner. According to the position of the reflector 30, the bearing surface of the supporting member 70 is inclined with respect to the depth direction of the upper splice opening 122, i.e. the up-down direction, and the assembling of the supporting member 70 can be ensured to be rapidly achieved by providing the guide protrusions 71 on the supporting member 70 such that the guide protrusions 71 are engaged with the guide grooves 123 on the lower housing 12. Preferably, in order to allow the supporter 70 to be quickly and accurately fitted to a predetermined depth, the bottom of the guide groove 123 is formed with a positioning surface 124, and the guide projection 71 is abutted against the positioning surface 124. And a handle 72 is formed on the support member 70 near the upper splice opening 122 in order to facilitate clamping of the support member 70 during the process of disassembling and assembling the support member 70.

Further, referring to fig. 1 to 6, in an embodiment, a lower opening 125 opened downward is formed at the bottom of the lower casing 12, the three-color modulation assembly is installed in the first cavity 121 through the lower opening 125, and the casing 10 further includes a lower cover 13 covering the lower opening 125 of the lower casing 12;

the bottom of the lower housing 12 includes a position-limiting flange 126, the position-limiting flange 126 extending from the sidewall of the lower housing 12 and being located below the lower ends of the support 70 and the reflector 30;

the position-defining flange 126 defines a part of the edge of the lower opening 125, and the lower end of the support 70 and the reflector 30 is located on the side of the edge of the lower opening 125 away from the center of the lower opening 125.

In the present embodiment, by providing the lower opening 125 that is open downward at the bottom of the lower housing 12, it is possible to ensure the supporting strength of the lower housing 12 in the up-down direction while facilitating the installation of these optical elements, as compared to providing the side walls of the lower housing 12 with the three-color modulation components, such as the collimator lens, the dichroic mirrors (222a, 222b), and the relay lens 223, for installation.

The supporting member 70 and the reflecting mirror 30 which are already installed can be better protected by providing the limiting flange 126 on the lower shell 12, and the installation of foreign objects or the lower cover 13 can be prevented from touching and interfering with the supporting member 70 and the lower end of the reflecting mirror 30.

Further, the projection optical engine further includes a first sealing ring 80a, the first sealing ring 80a is disposed along the edge of the lower opening 125 to be in sealing connection with the edges of the lower cover 13 and the lower opening 125, two opposite sides of the lower cover 13 and the limiting flange 126 are both in sealing fit with the first sealing ring 80a, the inner side surface of the limiting flange 126 is provided with a avoiding groove 126a, and the lower end of the supporting member 70 extends into the avoiding groove 126 a.

In this embodiment, the first sealing ring 80a is disposed to prevent water vapor and dust from entering the inner cavity of the lower housing 12 from the matching position of the lower cover 13 and the lower opening 125, so as to ensure the reliability of the operation of each optical element inside the lower housing 12. Since the limit flange 126 is in sealing engagement with the first seal ring 80a by its side facing the center of the lower opening 125, the inner side of the limit flange 126 is provided with the avoiding groove 126a, which not only ensures the lower end of the effective first avoiding support 70, but also ensures that the limit flange 126 has a sufficiently wide seal surface that engages with the first seal ring 80 a.

Further, referring to fig. 4, fig. 6 and fig. 11 to fig. 15, in an embodiment, the side wall of the lower housing 12 close to the supporting member 70 includes a vertical wall 127 and an inclined wall 128, wherein the vertical wall 127 is located at an upper portion, and the inclined wall 128 is inclined from the lower edge of the vertical wall 127 to a direction close to the three-color modulation assembly from top to bottom; the mirror 30 is disposed along the inclined wall 128 with the upper end of the support 70 adjacent the vertical wall 127;

the projection light engine further includes a mirror adjusting assembly, which includes a connector 91 and a plurality of adjusting members 92, wherein the connector 91 is used for connecting the supporting member 70 and pre-fixing the supporting member 70 with respect to the lower casing 12, and the plurality of adjusting members 92 are used for adjusting the distance between each position of the supporting member 70 and the inclined wall 128.

In this embodiment, the side wall of the lower housing 12 includes an inclined wall 128, so that the empty space between the support 70 or the reflector 30 and the side wall of the lower housing 12 is reduced, i.e. the compactness of the optical-mechanical projector is improved. And by providing the inclined wall 128 adjacent to the mirror 30, it is also facilitated that the connecting member 91 or the adjusting member 92 acts directly or indirectly on the inclined wall 128, i.e. while ensuring compactness of the mirror adjustment assembly.

Further, the mirror adjustment assembly further comprises an adaptor 93, the adaptor 93 is located between the inclined wall 128 and the support 70, and the elastic modulus of the adaptor 93 is greater than that of the inclined wall 128;

the inclined wall 128 is provided with a first avoiding hole 128a and a plurality of second avoiding holes 128b; the adaptor 93 is provided with a first connection hole 931 and a plurality of adjustment holes 932, the first connection hole 931 is disposed corresponding to the first avoiding hole 128a, and the plurality of adjustment holes 932 are disposed corresponding to the plurality of second avoiding holes 128b one to one;

the support member 70 is provided with a second connecting hole 73 corresponding to the first connecting hole 931; the connecting member 91 is inserted into the first connecting hole 931 and the second connecting hole 73 to fixedly connect the supporting member 70 and the adaptor member 93; the adjusting pieces 92 are disposed in the adjusting holes 932 in a one-to-one correspondence, and the adjusting pieces 92 are movably applied to the supporting member 70 along the axis of the adjusting holes 932 to swing the supporting member 70 relative to the inclined wall 128.

In this embodiment, since the bending strength of the inclined wall 128 is smaller than that of the adaptor 93, the inclined wall 128 may be made of a larger number of materials and at a lower cost. For example, when the adaptor 93 is made of stainless steel, engineering plastics may be used as the material of the inclined wall 128. And thus helps to reduce the material cost of the angled wall 128, since lower strength structural materials are generally less expensive than stronger structural materials. Preferably, the inclined wall 128 is made of plastic, the adaptor 93 is made of stainless steel, and the support 70 is made of aluminum alloy.

The fastening between the adapter 93 and the inclined wall 128 may be a screw fastening or an adhesive fastening, and the adapter 93 is not limited to the same structure as the inclined wall 128. For a more compact construction, the adapter 93 fits into the installation space between the support 70 and the inclined wall 128. For example, when the inclined wall 128 and the support 70 are both plate-shaped, the adaptor 93 may also be adapted plate-shaped, so that the inclined wall 128 and the adaptor 93 are assembled with the support 70 stacked two by two.

The structure of the connecting piece 91 may correspond to a standard piece such as a bolt, and the head of the connecting piece may be provided with a structure such as an internal hexagonal groove, a straight groove or a cross groove which facilitates the rotation of the connecting piece 91.

The adjustment of the support member 70 by the adjustment member 92 may be performed by pushing the support member 70 away from the inclined wall 128, by pulling the inclined wall 128 toward the inclined wall 128, or by a combination of pushing and pulling. The structure of the adjusting member 92 is corresponding to the adjusting manner, for example, if the adjusting member is only pushed away, one end of the adjusting member 92 abuts against one surface of the supporting member 70 facing the inclined wall 128; if the pushing away and pulling away are combined, one end of the adjusting member 92 may be embedded in the supporting member 70; the form of the adjusting hole 932 may also correspond to the moving manner of the adjusting member 92, for example, the adjusting member 92 only moves along a straight line, and the adjusting hole 932 may be a fixed through hole or a clamping hole; if a screw drive is desired, the adjustment holes 932 may be threaded to threadably engage the adjustment members 92. In order to increase the strength of the through hole 128c, annular ribs surrounding the through hole 128c may be provided on the surfaces of the inclined walls 128 facing away from the support member 70, respectively.

The inventive projection light machine adopts a separated structure design for adjusting and fixing the reflector 30, i.e. a connector 91 is separately arranged to fixedly support the support 70 for bearing the reflector 30, and the adjusting piece 92 mainly plays a role of adjusting the position of the support 70. By connecting the support element 70 to the inclined wall 128 by means of the connecting element 91, a preliminary positioning between the two parts to be connected is achieved, so that on this basis a smaller number of adjusting elements 92 and with a smaller adjustment range the mirror 30 can be adjusted to the correct position. In addition, the adjusting stress and the fixing stress of the reflector 30 are directly borne by the adapter 93, and the inclined wall 128 only needs to bear the fixing stress of the fixing adapter 93, so that the strength requirement of the inclined wall 128 is reduced, the inclined wall 128 can be made of more extensive and cheaper materials, and the deformation of the inclined wall 128 corresponding to the fixing stress of the fixing adapter 93 is not beyond the tolerance error range, so that the stability of the position state of the reflector 30 after adjustment is ensured.

Further, the reflector adjustment assembly further comprises a plurality of fasteners 94, the inclined wall 128 is further provided with a plurality of through holes 128c, the adaptor 93 is provided with a plurality of fixing holes 933, and the plurality of through holes 128c and the plurality of fixing holes 933 are arranged in one-to-one correspondence; the fasteners 94 are correspondingly inserted into the through holes 128c and the fixing holes 933 one to fixedly connect the adaptor 93 and the fixing base. Compared with the bonding fixation, the process is easier to control by adopting the fastener 94 to fixedly connect the adaptor 93 and the inclined wall 128. The fastener 94 may rivet, snap, or thread the adaptor 93 to the angled wall 128. However, in order to adjust the fixing position and reduce the material cost, the connecting member 91 includes a rod portion and a head portion disposed at one end of the rod portion, and the head portion abuts against a surface of the inclined wall 128 facing away from the supporting member 70; the first connecting hole 931 is a light hole, the second connecting hole 73 is an internally threaded hole, and the connecting member 91 is threadedly engaged with the second connecting hole 73. After the position of the reflector 30 is adjusted, in order to further ensure the stability of the adjusted position state of the reflector 30, the first clearance hole 128a is filled with fixing glue, and the fixing glue fixedly connects the connector 91 and the inclined wall 128.

Further, referring to fig. 4 to 8 again, in an embodiment, the projection lens 60 is located in a concave portion formed by the top surface of the lower housing 12 and the side surface of the upper housing 11, and the downward projection of the projection lens 60 falls on the top surface of the lower housing 12;

the top surface of the lower shell 12 is provided with a first annular groove 129 surrounding the upper splicing port 122, the bottom surface of the upper shell 11 is provided with a second annular groove 113 surrounding the lower splicing port 112, and the first annular groove 129 and the second annular groove 113 are correspondingly arranged in position; the projection light engine further comprises a second sealing ring 80b, and the second sealing ring 80b is installed in the first annular groove 129 and the second annular groove 113.

In this embodiment, the projection lens 60 is located in a concave portion formed by the top surface of the second housing 12 and the side surface of the first housing 11, so that the structure of the projection optical engine is more compact; on the other hand, due to the spatial layout, the projection of the center of gravity of the projection lens 60 in the horizontal plane is close to the projection of the center of gravity of the second housing 12 in the horizontal plane, so that the placement stability of the projector itself is high, and the installation and detection of the product are facilitated. By arranging the sealing structure at the joint of the upper joint port 122 and the lower joint port 112 for sealing, external water vapor and dust can be prevented from entering the inner cavity of the lower shell 12 or the inner cavity of the upper shell 11 through the upper joint port 122 and the lower joint port 112, so that the working reliability of the projection light machine is ensured. It can be understood that by providing the first annular groove 129 and the second annular groove 113 to cooperate with the second seal ring 80b, the contact area of each of the upper housing 11 and the lower housing 12 with the second seal ring 80b can be increased, thereby improving the sealing performance.

The invention also provides a projector which comprises a main control board and a projection optical machine, wherein the projection optical machine is the projection optical machine, and the main control board is electrically connected with the light sources (21a, 21b,21c and 21d) and the DMD optical modulator 50. In the embodiment, the main control board is electrically connected with the light sources (21a, 21b,21c and 21d) to drive the light sources (21a, 21b,21c and 21d) to be started and adjust the brightness of the light sources (21a, 21b,21c and 21d); the main control board is electrically connected to DMD light modulator 50 for converting the video signal into a deflection voltage signal for driving the deflection of the micromirrors in DMD light modulator 50. The specific structure of the projection optical machine refers to the above embodiments, and since the projector adopts all the technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not repeated here.

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

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

Claims (9)

1. A projection light machine comprises a shell (10), an optical illumination system (20), a reflector (30), a beam splitter prism (40), a DMD light modulator (50) and a projection lens (60), wherein the optical illumination system (20) comprises light sources (21a, 21b,21c, 21d) and a three-color modulation assembly, and is characterized in that,

the shell (10) comprises an upper shell (11) and a lower shell (12), a first containing cavity (121) is formed inside the lower shell (12), and an upper splicing opening (122) communicated with the first containing cavity (121) is formed in the top of the lower shell (12); a second containing cavity (111) is formed in the upper shell (11), and a lower splicing port (112) communicated with the first containing cavity (121) is formed in the bottom of the upper shell (11); the lower splicing port (112) is butted with the upper splicing port (122);

the light sources (21a, 21b,21c, 21d) are mounted to the lower housing (12), and the tristimulus modulation assembly is mounted to the first cavity (121); the upper splicing opening (122) has a size for the reflector (30) to pass through, and the reflector (30) passes through the upper splicing opening (122) and is installed in the first accommodating cavity (121); the reflector (30) is used for reflecting the three-color light modulated by the three-color modulation component towards the upper side of the upper splicing opening (122);

the projection lens (60) is connected with the upper shell (11), and the beam splitter prism (40) is arranged in the second accommodating cavity (111); the initial incidence surface of the light splitting prism (40) faces the lower splicing interface (112) to receive the light reflected by the reflecting mirror (30), and the cross section of the light splitting prism (40) is perpendicular to the optical axis plane of the three-color modulation assembly at the upstream of the reflecting mirror (30);

the projection optical machine further comprises a supporting piece (70) used for bearing the reflecting mirror (30), a guide protrusion (71) is arranged on the side edge of the supporting piece (70), the guide protrusion (71) extends towards the side wall of the lower shell (12), a guide groove (123) is formed in the side wall of the lower shell (12) corresponding to the guide protrusion (71), and the guide groove (123) extends in the up-down direction and penetrates through the edge of the upper splicing opening (122).

2. The optical projection engine according to claim 1, wherein a positioning surface (124) is formed at the bottom of the guide groove (123), and the guide protrusion (71) abuts against the positioning surface (124).

3. The light engine of claim 1, wherein the support member (70) is formed with a handle (72) proximate the top splice opening (122).

4. The projection engine of any of claims 1-3,

a lower opening (125) which is opened downwards is formed at the bottom of the lower shell (12), the three-color modulation assembly is installed in the first accommodating cavity (121) through the lower opening (125), and the shell (10) further comprises a lower cover (13) which covers the lower opening (125) of the lower shell (12);

the bottom of the lower shell (12) comprises a limiting flange (126), and the limiting flange (126) extends from the side wall of the lower shell (12) and is positioned below the lower ends of the support (70) and the reflector (30);

the limiting flange (126) limits a part of the edge of the lower opening (125), and the lower ends of the support (70) and the reflector (30) are positioned on one side of the edge of the lower opening (125) far away from the center of the lower opening (125).

5. The optical engine according to claim 4, further comprising a first sealing ring (80 a), wherein the first sealing ring (80 a) is disposed along an edge of the lower opening (125) to sealingly connect the lower cover (13) and the edge of the lower opening (125), two opposite surfaces of the lower cover (13) and the position-limiting flange (126) are sealingly engaged with the first sealing ring (80 a), an inner side surface of the position-limiting flange (126) has a position-avoiding groove (126 a), and a lower end of the support member (70) extends into the position-avoiding groove (126 a).

6. The projection engine of any of claims 1-3,

the side wall of the lower shell (12) close to the support (70) comprises a vertical wall (127) and an inclined wall (128), wherein the vertical wall (127) is positioned at the upper part, and the inclined wall (128) is obliquely arranged from top to bottom from the lower edge of the vertical wall (127) to the direction close to the three-color modulation assembly; the mirror (30) being disposed along the inclined wall (128), the upper end of the support (70) being adjacent the vertical wall (127);

the projection light machine further comprises a reflector adjusting assembly, the reflector adjusting assembly comprises a connecting piece (91) and a plurality of adjusting pieces (92), the connecting piece (91) is used for connecting the supporting piece (70) and enabling the supporting piece (70) to be pre-fixed relative to the lower shell (12), and the adjusting pieces (92) are used for adjusting the distance between each part of the supporting piece (70) and the inclined wall (128).

7. The projection light engine of claim 6, characterized in that the mirror adjustment assembly further comprises an adapter (93), the adapter (93) is located between the slanted wall (128) and the support (70), and the modulus of elasticity of the adapter (93) is greater than the modulus of elasticity of the slanted wall (128);

a first avoiding hole (128 a) and a plurality of second avoiding holes (128 b) are formed in the inclined wall (128); the adaptor (93) is provided with a first connecting hole (931) and a plurality of adjusting holes (932), the first connecting hole (931) is arranged corresponding to the first avoiding hole (128 a), and the adjusting holes (932) are arranged corresponding to the second avoiding holes (128 b) one by one;

the support piece (70) is provided with a second connecting hole (73) corresponding to the first connecting hole (931); the connecting piece (91) penetrates through the first connecting hole (931) and the second connecting hole (73) to fixedly connect the support piece (70) and the adapter piece (93); the adjusting pieces (92) are arranged in the adjusting holes (932) in a one-to-one correspondence mode, and the adjusting pieces (92) can movably act on the supporting piece (70) along the axis of the adjusting holes (932) to enable the supporting piece (70) to swing relative to the inclined wall (128).

8. The light engine of claim 1,

the projection lens (60) is positioned in a concave part formed by enclosing the top surface of the lower shell (12) and the side surface of the upper shell (11), and the downward projection of the projection lens (60) falls on the top surface of the lower shell (12);

the top surface of the lower shell (12) is provided with a first annular groove (129) surrounding the upper splicing opening (122), the bottom surface of the upper shell (11) is provided with a second annular groove (113) surrounding the lower splicing opening (112), and the first annular groove (129) and the second annular groove (113) are correspondingly arranged in position; the projection light machine further comprises a second sealing ring (80 b), and the second sealing ring (80 b) is installed in the first annular groove (129) and the second annular groove (113).

9. A projector comprising a main control board and a projection light machine, wherein the projection light machine is the projection light machine according to any one of claims 1-8, and the main control board is electrically connected with the light sources (21a, 21b,21c, 21d) and the DMD light modulator (50).

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