CN113296228A

CN113296228A - Beam splitting prism fixed knot constructs and projection ray apparatus

Info

Publication number: CN113296228A
Application number: CN202110177495.5A
Authority: CN
Inventors: 孙峰; 朱青; 杨浩
Original assignee: Shenzhen Anhua Optoelectronics Technology Co Ltd
Current assignee: Shenzhen Anhua Photoelectric Technology Co ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2021-08-24
Anticipated expiration: 2041-02-07
Also published as: CN113296228B

Abstract

The invention provides a fixing structure of a beam splitter prism and a projection optical machine, wherein the fixing structure of the beam splitter prism comprises a main case made of plastic materials, the beam splitter prism, an upper cover, an elastic body and a heat dissipation cover made of metal materials; the cavity of the main machine shell is upward opened and is provided with a prism mounting area; the prism mounting area comprises a first limiting surface and a second limiting surface which are crossed; the first limiting surface is provided with a first mounting opening, and the second limiting surface is provided with a second mounting opening; a window is arranged on the bottom wall of the main machine shell corresponding to the prism mounting area; a vertical groove is formed in the side wall surface of the main case, and the beam splitter prism is mounted in the prism mounting area; the elastic body is embedded in the vertical groove, and the elastic force of the elastic body acts on the beam splitting prism to tightly press the beam splitting prism; the heat dissipation cover comprises a bottom heat conduction part and a side heat dissipation part, the bottom heat conduction part covers the window and is fixedly connected with the beam splitter prism and the mainframe shell respectively, and the side heat dissipation part extends upwards to the outer side of the mainframe shell from one end of the bottom heat conduction part. The invention solves the problem that volatile matters are generated when the OFF light of the beam splitter prism burns a component and improves heat dissipation.

Description

Beam splitting prism fixed knot constructs and projection ray apparatus

Technical Field

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

Background

The projection light machine is a core component of the projector, and the projection light machine of the portable projector comprises a main machine shell, a light source, an illumination optical element, a DMD light modulator and a lens, and further comprises a beam splitter prism. The main components of the projection optical machine are generally laid horizontally along the same horizontal plane, the main case is designed to be a cavity part with an opening at the upper side, the light source and the DMD optical modulator are arranged on the side wall of the main case, and the illumination optical element (such as a collimating lens) and the beam splitter prism are arranged in the inner cavity of the main case.

In order to ensure enough dimensional accuracy and assemblability in mass production, the main chassis is of an integral structure and is made of plastic materials. However, when the OFF light of the beam splitter prism has a downward component, on the one hand, under high intensity light, the bottom wall of the main chassis can be burned, and the volatile matters generated therewith can be solidified and attached to the beam splitter prism and the adjacent lens and DMD light modulator, which can cause a significant reduction in projection quality; on the other hand, since the heat is concentrated and not easily dissipated, the thermal environment of the optical element is also deteriorated, and thus the projection quality is also reduced.

Disclosure of Invention

In view of the above situation, the main objective of the present invention is to provide a fixing structure of a beam splitter prism and a projection optical apparatus with good heat dissipation, which can avoid the generation of volatile matter containing fine solid particles.

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

a fixing structure of a beam splitter prism comprises a main machine shell, a beam splitter prism, an upper cover and an elastic body, wherein the main machine shell is made of plastic materials;

the main machine shell forms a cavity with an upward opening, and the cavity is provided with a prism mounting area for mounting the beam splitter prism; the prism mounting area comprises a first limiting surface and a second limiting surface, and the first limiting surface and the second limiting surface are arranged in a crossed mode; the first limiting surface is provided with a first mounting hole for mounting a projection lens, and the second limiting surface is provided with a second mounting hole for mounting a DMD (digital micromirror device) optical modulator;

a window corresponding to the light splitting prism is arranged on the bottom wall of the host shell corresponding to the prism mounting area; a side wall surface of the main case opposite to the first limiting surface is provided with a vertical groove extending along the up-down direction, the upper end of the vertical groove is communicated to the upper opening of the cavity, and the lower end of the vertical groove is communicated to the window;

the beam splitter prism is arranged in the prism installation area; the elastic body is embedded in the vertical groove, and the elastic force of the elastic body acts on the beam splitter prism to tightly press the beam splitter prism to the first limiting surface and the second limiting surface; the upper cover covers the upper opening of the cavity;

the heat dissipation cover comprises a bottom heat conduction part and a side heat dissipation part, the bottom heat conduction part covers the window and is fixedly connected with the beam splitter prism and the main case respectively, the side heat dissipation part extends upwards from one end, far away from the first limiting surface, of the bottom heat conduction part, and the side heat dissipation part is located on the outer side of the side wall of the main case.

Preferably, the bottom surface of the main chassis is provided with a plurality of fixing holes and a plurality of step-shaped concave portions on the periphery of the window, and the bottom heat conducting portion is provided with a plurality of through holes which are matched with the fixing holes one by one; the beam splitter prism also comprises a plurality of first fasteners, and the first fasteners penetrate through the through holes to be matched with the fixing holes so as to be fixedly connected with the heat dissipation cover and the main case; the stepped recess comprises a bottom step surface and a side step surface, the bottom step surface is attached to the upper surface of the bottom heat conducting portion, and the side step surface faces the center of the window and is abutted to the side face of the bottom heat conducting portion.

Preferably, the step-shaped concave part is arranged on the edge of the window extending along the first limiting surface, the edge extending along the second limiting surface and the edge opposite to the second limiting surface; a flat groove is formed in the edge, opposite to the first limiting surface, of the window, and the flat groove penetrates through the outer side face of the main case; the light splitting prism fixing structure further comprises a sealing strip, the sealing strip is arranged between the bottom wall surface of the flat groove and the bottom heat conducting portion, and sealing glue is filled between the edge of the bottom heat conducting portion and the window.

Preferably, the diapire face of straight flute with the junction of the lateral surface of host computer shell is equipped with the mounting groove, the sealing strip is embedded in mounting groove and protrusion in the diapire face of straight flute.

Preferably, a process groove is formed in a joint of the bottom wall surface of the flat groove and the side wall surface of the mounting groove, the bottom wall surface of the process groove is flush with the bottom wall surface of the mounting groove, one part of the fixing holes in the plurality of fixing holes penetrates through the bottom wall surface of the flat groove, and the other part of the fixing holes penetrates through the bottom wall surface of the process groove.

Preferably, the light splitting prism comprises a primary prism and a secondary prism fixedly bonded with the primary prism, glue dispensing holes are respectively formed in the bottom heat conduction part corresponding to the primary prism and the secondary prism, and openings on the inner sides of the glue dispensing holes are arranged in a gradually expanding manner from bottom to top.

Preferably, the side step surface of the stepped recess portion arranged corresponding to the first and second limiting surfaces is provided with a clamping protrusion, and the clamping protrusion abuts against the lower surface of the bottom heat conducting portion.

Preferably, the edge of the first mounting opening and the edge of the second mounting opening are respectively provided with a demolding notch corresponding to the upward projection areas of the two clamping protrusions.

Preferably, the fixing structure of the beam splitter prism further includes a light blocking member, the light blocking member is disposed on a side of the beam splitter prism away from the second limiting surface, and the light blocking member is disposed adjacent to the first limiting surface; two fixing holes are arranged, one fixing hole is arranged close to the sealing strip, and the other fixing hole is arranged on one side, away from the beam splitter prism, of the light blocking piece; the edge of the bottom heat conducting part, which is far away from the second limiting surface, is provided with a lug, and one of the two through holes is arranged on the lug.

Preferably, the upper cover is made of metal, a gap is formed between the side heat dissipation part and the outer side surface of the main chassis, and heat dissipation fins are arranged on the outer side surface of the side heat dissipation part.

Preferably, the fixing structure of the beam splitter prism further includes a support member, and the elastic force of the elastic body acts on the support member to press the beam splitter prism to the first and second limiting surfaces.

A projection optical machine comprises a DMD optical modulator, a lens and the fixing structure of the beam splitter prism, wherein the fixing structure of the beam splitter prism comprises a host shell, a beam splitter prism, an upper cover and an elastic body;

the main machine shell forms a cavity with an upward opening, and one prism mounting area of the cavity is used for mounting the beam splitter prism; the prism mounting area comprises a first limiting surface and a second limiting surface which are arranged in a crossed mode; the first limiting surface is provided with a first mounting hole for mounting a projection lens, and the second limiting surface is provided with a second mounting hole for mounting a DMD (digital micromirror device) optical modulator;

a window corresponding to the light splitting prism is arranged on the bottom wall of the host shell corresponding to the prism mounting area; a side wall surface of the main case opposite to the first limiting surface is provided with a vertical groove extending along the vertical direction, the upper end of the vertical groove is communicated to the upper opening of the cavity, and the lower end of the vertical groove is communicated to the window;

the beam splitter prism is arranged in the prism installation area; the elastic body is embedded in the vertical groove, and the elastic force of the elastic body acts on the beam splitter prism so as to tightly press the beam splitter prism to the first limiting surface and the second limiting surface through the supporting piece; the upper cover covers the upper opening of the cavity;

the heat dissipation cover comprises a bottom heat conduction part and a side heat dissipation part, the bottom heat conduction part covers the window and is fixedly connected with the beam splitter prism and the main case respectively, and the side heat dissipation part extends upwards to the outer side of the main case from one end, far away from the first limiting surface, of the bottom heat conduction part.

According to the fixing structure of the beam splitter prism, the main machine shell is still made of the plastic material, but the OFF light irradiated downwards by the beam splitter prism is locally received through the heat dissipation cover made of the metal material, so that the sufficient size precision and assembly performance are ensured, and the problem of volatile matters generated due to part burning caused by high-intensity light beam irradiation is solved on the premise that the cost is not obviously increased. In addition, the outer side radiating piece of the side wall of the main case is also provided with a side radiating part which is connected with the bottom heat conducting part, so that the heat absorbed by the bottom heat conducting part can be quickly radiated, the thermal environment inside the main case is improved, and the working reliability of the projection light machine is ensured from the other side surface.

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

A preferred embodiment of a projection light engine 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 according to the present invention;

FIG. 2 is a schematic diagram of a partially exploded optical engine of the projector of FIG. 1;

FIG. 3 is a schematic view of a portion of the enlarged structure of FIG. 2 at Structure A;

FIG. 4 is a schematic diagram of the structure of FIG. 2, further exploded;

FIG. 5 is a schematic view of a portion of the enlarged structure at B in FIG. 4;

FIG. 6 is a schematic structural diagram of the main chassis in FIG. 5;

FIG. 7 is a bottom view of the optical projection engine of FIG. 1;

FIG. 8 is an enlarged partial view of the structure at C in FIG. 7;

FIG. 9 is a schematic view of the optical projection engine of FIG. 1 in a partially exploded view from another angle;

FIG. 10 is an enlarged partial schematic view of FIG. 9 at D;

FIG. 11 is a schematic structural diagram of the main chassis of FIG. 9;

FIG. 12 is an enlarged partial view of FIG. 11 at E;

FIG. 13 is a schematic top view of the projector of FIG. 1;

FIG. 14 is a schematic cross-sectional view taken along line XIV-XIV in FIG. 13;

FIG. 15 is an enlarged partial view of FIG. 14 at F;

FIG. 16 is a rear view of the optical projection engine of FIG. 1;

FIG. 17 is a schematic cross-sectional view taken along line XVII-XVII in FIG. 16;

fig. 18 is a partially enlarged view of the structure at G in fig. 17.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)	Reference numerals	Name (R)
						100	DMD light modulator	18b	Stepped recess	45	Positioning projection
200	Lens barrel	18c	Stepped recess	50	Elastic body
						10	Main machine case	181a，181b	Clamping projection		60	Heat dissipation cover
11	Hollow cavity	19	Flat groove	61	Bottom heat conducting part
						12	Prism mounting area	191	Mounting groove	611a，611b	Through hole
13	A first limit surface	192	Art groove	612	Glue dispensing hole
						131	The first mounting port	20	Light splitting prism	613	Convex lug
132	Demoulding gap	21	Primary prism	62	Side heat dissipation part
						14	Second limit surface	22	Secondary prism	621	Radiating fin
141	Second mounting port	30	Upper cover	63	Gap
						142	Demoulding gap	40	Support piece	70	First fastener
15	Window opening	41	Clamp hole	80	Sealing strip
						16	Vertical groove	42	Pressing plate	90	Light barrier
17a，17b	Fixing hole		43	Wing plate
						18a	Stepped recess	44	Reinforced rib plate

Detailed Description

Referring to fig. 1 to 6 and 11, the fixing structure of the beam splitter prism of the present invention includes a main housing 10, a beam splitter prism 20, an upper cover 30 and an elastic body 50, wherein the main housing 10 is made of plastic, and the fixing structure of the beam splitter prism 20 further includes a heat dissipation cover 60 made of metal;

the main machine shell 10 forms an upward open cavity 11, and the cavity 11 is provided with a prism mounting area 12 for mounting the beam splitter prism 20; the prism mounting area 12 comprises a first limiting surface 13 and a second limiting surface 14, and the first limiting surface 13 and the second limiting surface 14 are arranged in a crossed manner; the first limiting surface 13 is provided with a first mounting hole 131 for mounting the projection lens 200, and the second limiting surface 14 is provided with a second mounting hole 141 for mounting the DMD light modulator 100;

a window 15 corresponding to the beam splitter prism 20 is formed on the bottom wall of the main chassis 10 corresponding to the prism mounting area 12; a vertical groove 16 extending in the vertical direction is formed in the side wall surface of the main case 10 opposite to the first limit surface 13, the upper end of the vertical groove 16 is communicated with the upper opening of the cavity 11, and the lower end of the vertical groove 16 is communicated with the window 15;

the beam splitter prism 20 is arranged in the prism mounting area 12; the elastic body 50 is embedded in the vertical groove 16, and the elastic force of the elastic body 50 acts on the beam splitter prism 20 to press the beam splitter prism 20 to the first limiting surface 13 and the second limiting surface 14; the upper cover 30 covers the upper opening of the cavity 11;

the heat dissipation cover 60 includes a bottom heat conduction portion 61 and a side heat dissipation portion 62, the bottom heat conduction portion 61 covers the window 15 and is fixedly connected with the beam splitter prism 20 and the main chassis 10, the side heat dissipation portion 62 extends upward from one end of the bottom heat conduction portion 61 far away from the first limiting surface 13, and the side heat dissipation portion 62 is located outside the side wall of the main chassis 10.

In this embodiment, the main chassis 10 is used to provide cavity parts for supporting and protecting a plurality of main components of the projection light engine, and the main chassis 10 made of plastic material may be formed by an injection molding process. The cavity 11 of the main chassis 10 may be divided into a plurality of regions according to functions, such as a region for mounting a collimating lens, a region for mounting a reflecting mirror, and the like.

The bottom window 15 of the main chassis 10 is designed to allow the downward OFF light component of the splitting prism 20 to reach the heat dissipation cover 60 installed therein, and the size of the upper window 15 is designed to be adapted to the size of the cross section of the OFF light component, but for the convenience of assembling the heat dissipation cover 60 and the splitting prism 20, the shape and size of the window 15 are similar to the shape and size of the bottom surface of the splitting prism 20. The vertical grooves 16 are used for installing the elastic body 50, and ensure that the elastic body 50 generates designed compression amount in a preset direction, thereby ensuring that enough elastic force is generated in a correct direction, and because the lower ends of the vertical grooves 16 are communicated to the windows 15, the vertical grooves 16 are more suitable for demolding and the position of the elastic body 50 in the longitudinal direction can be conveniently adjusted. It is understood that the elastic force of the elastic body 50 is greater than zero in both the component toward the first stopper surface 13 and the component toward the second stopper surface 14, so that the positional accuracy of the splitting prism 20 can be ensured in the horizontal plane.

The beam splitter prism 20 is used for initially receiving the light beam and converting the direction of the light beam to project the light beam to the DMD light modulator 100, and then projects the light beam modulated by the DMD light modulator 100 to the projection lens 200.

The upper cover 30, the heat dissipation cover 60 and the main chassis 10 form a closed space, the heat dissipation cover 60 can be fixed at the window 15 of the bottom wall of the main chassis 10 by a first fastening member 70, such as a screw or a bolt, and the upper cover 30 can be fixed at the upper opening of the main chassis 10 by a second fastening member (not numbered). In assembly, in order to provide support for the splitting prism 20 at the bottom, the heat dissipation cover 60 is preferably assembled prior to the splitting prism 20, and the upper cover 30 covers the upper opening of the main housing 10 after the assembly of the components of the inner cavity of the main housing 10 is completed. The top cover 30 is made of metal, and thus, together with the heat dissipation cover 60, the heat dissipation can be further improved.

The elastic body 50 may directly or indirectly apply elastic force to the prism 20. In order to mount the elastic body 50 using the side wall of the main chassis 10, when there is a large distance between the vertical groove 16 and the prism 20, the support member 40 may be provided to transmit the elastic force of the elastic body 50. In addition, in order to facilitate the movement of the splitting prism 20 during the assembly process, the support member 40 is adhesively fixed to the splitting prism 20, and preferably, the support member 40 is formed with a clamp hole 41 such that the side wall of the clamp hole 41 is clamped by a clamp to move the splitting prism 20 together, thereby preventing the splitting prism 20 from being stained or damaged.

In the fixing structure of the beam splitter prism 20 of the present invention, the main housing 10 is still made of plastic material, but the OFF light irradiated downwards by the beam splitter prism 20 is locally received by the heat dissipation cover 60 made of metal material, so that not only enough dimensional accuracy and assemblability are ensured, but also the problem of volatile matter generation due to component burn caused by high intensity light beam irradiation is solved without significantly increasing the cost. In addition, the outer side heat sink of the side wall of the main chassis 10 is further provided with a side heat sink 62, and the side heat sink 62 is connected with the bottom heat conducting part 61, so that heat absorbed by the bottom heat conducting part 61 can be rapidly dissipated, the thermal environment inside the main chassis 10 is improved, and the working reliability of the projection light machine is ensured from the other side surface.

Further, referring to fig. 7 to 12, in an embodiment, the bottom surface of the main chassis 10 is provided with a plurality of fixing holes (17a, 17b) and a plurality of stepped recesses (18a, 18b, 18c) at the periphery of the window 15, and the bottom heat conducting portion 61 is provided with a plurality of through holes (611a, 611b) adapted to the fixing holes (17a, 17b) one by one; the beam splitter prism 20 further comprises a plurality of first fasteners 70, wherein the first fasteners 70 penetrate through the through holes (611a, 611b) to be matched with the fixing holes (17a, 17b) so as to fixedly connect the heat dissipation cover 60 and the main chassis 10; the stepped recess (18a, 18b, 18c) includes a bottom step surface that is attached to the upper surface of the bottom heat-conducting portion 61, and a side step surface that faces the center of the window 15 and is in contact with the side surface of the bottom heat-conducting portion 61.

In the present embodiment, the stepped recesses (18a, 18b, 18c) are provided, so that the bottom heat conduction part 61 of the heat sink can be relatively fitted into the bottom wall of the main chassis 10, and the assembly accuracy of the heat sink can be ensured by the stopper effect of the bottom step surfaces and the side step surfaces of the stepped recesses (18a, 18b, 18 c). The coupling strength between the heat sink and the main chassis 10 can be secured by coupling the heat sink and the main chassis 10 using first fasteners 70, preferably, the first fasteners 70 are screws, and the fixing holes (17a, 17b) are screw holes.

Further, the edge of the window 15 extending along the first stopper face 13, the edge extending along the second stopper face 14, and the edge opposite to the second stopper face 14 are provided with stepped recesses (18a, 18b, 18 c); the edge of the window 15 opposite to the first limiting surface 13 is provided with a flat groove 19, and the flat groove 19 penetrates through the outer side surface of the main case 10. Referring to fig. 13 to 15, the fixing structure of the splitting prism further includes a sealing strip 80, the sealing strip 80 is disposed between the bottom wall surface of the flat groove 19 and the bottom heat conducting portion 61, and a sealing glue is filled between the edge of the bottom heat conducting portion 61 and the window 15.

In this embodiment, the flat groove 19 is provided so that the bottom heat conduction portion 61 and the side heat dissipation portion 62 can be made into a simple plate shape to cover the window 15 and extend to the outside of the side wall of the main chassis 10. Before filling the sealing glue, the side step surfaces of the stepped recesses (18a, 18b, 18c) may serve to position the bottom heat conduction portion 61 at the horizontal plane. Because the connecting part of bottom heat conduction portion 61 and side heat dissipation portion 62 is difficult to apply liquid sealing glue, through setting up sealing strip 80 as the substitution for sealing connection has all been realized at the edge of whole window 15, so, avoided external dust to invade the inner chamber of main case 10 from the fitting surface of heat dissipation piece and main case 10, thereby guaranteed the reliability of projection ray apparatus long-term use.

Further, referring to fig. 10, 12 and 15, in an embodiment, a connection portion between a bottom wall surface of the flat slot 19 and the outer side surface of the main chassis 10 is provided with a mounting slot 191, and the sealing strip 80 is embedded in the mounting slot 191 and protrudes out of the bottom wall surface of the flat slot 19.

In this embodiment, the installation groove 191 is provided to position the sealing strip 80, and in addition, the contact area between the sealing strip 80 and the main chassis 10 can be increased, thereby improving the sealing performance.

Further, referring to fig. 10 and 12 again, in an embodiment, a process groove 192 is disposed at a connection portion between a bottom wall surface of the flat groove 19 and a side wall surface of the mounting groove 191, a bottom wall surface of the process groove 192 is flush with a bottom wall surface of the mounting groove 191, and a portion of one fixing hole (17a, 17b) of the plurality of fixing holes (17a, 17b) penetrates through the bottom wall surface of the flat groove 19, and another portion penetrates through the bottom wall surface of the process groove 192.

In this embodiment, the provision of the process groove 192 prevents an excessively thin structure from being formed between the adjacent fixing holes (17a, 17b) and the side wall surface of the mounting groove 191; the bottom surface of the process groove 192 is flush with the bottom surface of the mounting groove 191, which facilitates the manufacturing of the injection mold of the main chassis 10.

Further, referring to fig. 7 to 9 and fig. 13 to 15, in an embodiment, the light splitting prism 20 includes a primary prism 21 and a secondary prism 22 bonded and fixed with the primary prism 21, glue dispensing holes 612 are respectively formed on the bottom heat conduction portion 61 corresponding to the primary prism 21 and the secondary prism 22, and inner openings of the glue dispensing holes 612 are gradually enlarged from bottom to top.

In the present embodiment, the two prisms are independently bonded to the bottom heat conduction part 61 of the heat sink, which is advantageous for enhancing the stability of the splitting prism 20, and particularly, the splitting prism 20 is an RTIR prism.

Further, in order to reduce the number of the first fastening members 70 used to improve the assembly efficiency and ensure the stable assembly of the heat sink, referring to fig. 3, 5 to 8, 10 to 12, and 18, in an embodiment, the stepped surfaces of the stepped recesses (18a, 18b, 18c) corresponding to the first and second limiting

surfaces

13 and 14 are provided with locking protrusions (181a, 181b), and the locking protrusions (181a, 181b) are abutted against the lower surface of the bottom heat conduction portion 61. During assembly, one side of the bottom heat conducting part 61 of the heat radiating piece can be plugged between the clamping protrusions (181a and 181b) and the bottom step surfaces of the corresponding step-shaped concave parts (18a and 18b), and then the first fastening piece 70 is locked, so that the assembly efficiency can be improved on the premise of ensuring stable assembly.

Furthermore, for convenience of molding the snap protrusions (181a, 181b) by using an injection molding process, the edge of the first mounting opening 131 and the edge of the second mounting opening 141 are respectively formed with a mold release notch (132, 142) corresponding to the upward projection area of the two snap protrusions (181a, 181b), so that the snap protrusions (181a, 181b) can be molded by drawing from bottom to top only by moving the mold.

Further, referring to fig. 2 to 12, in an embodiment, the fixing structure of the light splitting prism further includes a light blocking member (90), the light blocking member (90) is disposed on a side of the light splitting prism 20 away from the second position-limiting surface 14, and the light blocking member (90) is disposed adjacent to the first position-limiting surface 13. In order to ensure the stability of the assembly and provide enough assembly space for the light blocking member (90), two fixing holes (17a, 17b) are arranged, one fixing hole (17a, 17b) is arranged adjacent to the sealing strip 80, and the other fixing hole is arranged on the side, away from the light splitting prism 20, of the light blocking member (90); the edge of the bottom heat conduction part 61 far away from the second limit surface 14 is provided with a lug (613), and one of the two through holes (611a, 611b) is arranged on the lug (613).

Further, referring to fig. 1, fig. 2, and fig. 13 to fig. 15, in order to further enhance the heat dissipation effect, in an embodiment, the upper cover 30 is made of a metal material, a gap 63 is formed between the side heat dissipation portion 62 and the outer side surface of the main chassis 10, and heat dissipation fins 621 are disposed on the outer side surface of the side heat dissipation portion 62.

In this embodiment, the upper cover 30 can receive the upward-directed stray light component or receive the heat from the inner cavity of the main chassis 10, and then dissipate the heat through the upper surface of the upper cover 30. By arranging the gap 63 between the side heat dissipation part 62 and the main chassis 10, on one hand, the increase of a heat dissipation path from the side heat dissipation part 62 to the main chassis 10 can be avoided, and the heat quantity returned to the main chassis 10 is reduced; on the other hand, the presence of the gaps 63 also improves the heat circulation condition of the side heat dissipation portions 62, so that heat can be more quickly exchanged into the air, thus improving the heat dissipation effect. The heat dissipation fins 621 are provided to increase the contact area between the heat dissipation member and the air, so as to further improve the heat dissipation effect.

Further, referring to fig. 2 to 4, 9, and 13 to 15, in an embodiment, the fixing structure of the beam splitter prism further includes a supporting member 40, and the elastic force of the elastic body 50 acts on the supporting member 40 to press the beam splitter prism 20 to the first position-limiting surface 13 and the second position-limiting surface 14 through the supporting member 40.

In the present embodiment, the outer side wall of the main chassis 10 is configured to have a relatively regular shape, so that a relatively large gap 63 may be formed between the prism having the inclined side surface, and the supporting member 40 is configured to facilitate the transmission of the elastic force of the elastic body 50. In addition, it is preferable that the support member 40 is adhesively fixed to the prism 20, and the prism 20 can be easily moved during the assembly process. Further, the supporting member 40 is formed with a clamping hole 41, so that the side wall of the clamping hole 41 is clamped by the clamp to move the splitting prism 20 together, thereby preventing the splitting prism 20 from being stained or damaged.

Further, referring to fig. 2 to 4, 9, and 16 to 18, in an embodiment, the supporting member 40 includes a pressing plate 42 and a wing plate 43, the pressing plate 42 is attached to a surface of the beam splitter prism 20 away from the first limiting surface 13, the wing plate 43 extends from the pressing plate 42 and is inclined to the first limiting surface 13 and the second limiting surface 14, the clamping hole 41 is formed between the pressing plate 42 and the wing plate 43, and the elastic body 50 is elastically abutted to the wing plate 43.

In this embodiment, the pressing plate 42 is provided to ensure a sufficient bonding area between the supporting member 40 and the splitting prism 20, and to ensure the bonding strength. The elastic force of the elastic body 50 can indirectly apply pressure to the beam splitter prism 20 in a correct direction by the inclined arrangement of the wing plate 43 relative to the first and second limiting

surfaces

13 and 14, so that the beam splitter prism 20 abuts against the first and second limiting

surfaces

13 and 14. By designing the supporting member 40 to have a thin wall structure while ensuring the structural design strength, the supporting member 40 can also be manufactured by an injection molding process suitable for mass production without generating a shrinkage cavity. It is understood that if the support member 40 itself has low dimensional accuracy, the assembling accuracy of the prism 20 is also reduced. Preferably, in order to increase the strength of the supporting member 40 itself, the pressing plate 42 is provided with a plurality of reinforcing ribs 44 on the side facing the wing plate 43.

Further, the side of the pressing plate 42 departing from the wing plate 43 is provided with a positioning protrusion 45, and the positioning protrusion 45 is attached to the side of the beam splitter prism 20 departing from the second limiting surface 14.

In the present embodiment, when the support member 40 is bonded to the beam splitter prism 20, the positioning protrusion 45 abuts against a side surface, for example, an initial incident surface, of the beam splitter prism 20, thereby achieving accurate positioning between the support member 40 and the beam splitter prism 20.

Further, the positioning protrusions 45 are located at the edge of the pressing plate 42, which is far away from the second limiting surface 14, two positioning protrusions 45 are arranged, and the two positioning protrusions 45 are arranged at intervals in the vertical direction. It is understood that, if there is only one positioning protrusion 45, since the limit area between one positioning protrusion 45 and the beam splitter prism 20 is small, the support member 40 may swing excessively due to an excessively small contact area during the process of bonding the support member 40, and thus the support member 40 may not be reliably engaged with the elastic body 50. Through setting up two location arch 45 to increase the distance between two location arch 45, so can reach better location effect.

Referring to fig. 1 to fig. 6 and fig. 11, the present invention further provides a projection optical machine, which includes a DMD optical modulator 100, a lens 200, and a fixing structure of a beam splitter prism, where the specific structure of the fixing structure of the beam splitter prism refers to the above embodiments, and since the projection optical machine adopts all technical solutions of all the above embodiments, the projection optical machine also has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated here.

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

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

Claims

1. A fixing structure of a beam splitter prism comprises a main machine shell (10), a beam splitter prism (20), an upper cover (30) and an elastic body (50), wherein the main machine shell (10) is made of plastic materials, and is characterized by further comprising a heat dissipation cover (60) made of metal materials;

the main machine shell (10) forms an upward-opening cavity (11), and the cavity (11) is provided with a prism mounting area (12) for mounting the beam splitter prism (20); the prism mounting area (12) comprises a first limiting surface (13) and a second limiting surface (14), and the first limiting surface (13) and the second limiting surface (14) are arranged in a crossed mode; the first limiting surface (13) is provided with a first mounting opening for mounting a projection lens (200), and the second limiting surface (14) is provided with a second mounting opening for mounting a DMD (digital micromirror device) light modulator (100);

a window (15) corresponding to the light splitting prism (20) is formed in the bottom wall of the main case (10) corresponding to the prism mounting area (12); a vertical groove (16) extending in the vertical direction is formed in the side wall surface, opposite to the first limiting surface (13), of the main case (10), the upper end of the vertical groove (16) is communicated with the upper opening of the cavity (11), and the lower end of the vertical groove (16) is communicated with the window (15);

the beam splitter prism (20) is mounted on the prism mounting area (12); the elastic body (50) is embedded in the vertical groove (16), and the elastic force of the elastic body (50) acts on the beam splitter prism (20) to press the beam splitter prism (20) to the first limiting surface (13) and the second limiting surface (14); the upper cover (30) covers the upper opening of the cavity (11);

the heat dissipation cover (60) comprises a bottom heat conduction part (61) and a side heat dissipation part (62), the bottom heat conduction part (61) covers the window (15) and is fixedly connected with the beam splitter prism (20) and the main case (10) respectively, the side heat dissipation part (62) extends upwards from one end, far away from the first limiting surface (13), of the bottom heat conduction part (61), and the side heat dissipation part (62) is located on the outer side of the side wall of the main case (10).

2. The fixing structure of a splitting prism according to claim 1, wherein the bottom surface of the main chassis (10) is provided with a plurality of fixing holes (17a, 17b) and a plurality of stepped recesses (18a, 18b, 18c) at the periphery of the window (15), and the bottom heat conducting part (61) is provided with a plurality of through holes (611a, 611b) adapted to the fixing holes (17a, 17b) one by one; the light splitting prism (20) further comprises a plurality of first fasteners (70), and the first fasteners (70) penetrate through the through holes (611a, 611b) to be matched with the fixing holes (17a, 17b) so as to fixedly connect the heat dissipation cover (60) and the main machine shell (10); the stepped recess (18a, 18b, 18c) includes a bottom step surface that is fitted to the upper surface of the bottom heat-conducting portion (61), and a side step surface that faces the center of the window (15) and is in abutment with the side surface of the bottom heat-conducting portion (61).

3. The fixing structure of a splitting prism according to claim 2, wherein an edge of the window (15) extending along the first stopper face (13), an edge extending along the second stopper face (14), and an edge opposite to the second stopper face (14) are provided with the stepped recesses (18a, 18b, 18 c); a flat groove (19) is formed in the edge, opposite to the first limiting surface (13), of the window (15), and the flat groove (19) penetrates through the outer side face of the main case (10); the light splitting prism fixing structure further comprises a sealing strip (80), the sealing strip (80) is arranged between the bottom wall surface of the flat groove (19) and the bottom heat conducting portion (61), and sealing glue is filled between the edge of the bottom heat conducting portion (61) and the window (15).

4. The fixing structure of the splitting prism of claim 3, wherein a mounting groove is provided at a junction of the bottom wall surface of the flat groove (19) and the outer side surface of the main chassis (10), and the sealing strip (80) is embedded in the mounting groove and protrudes from the bottom wall surface of the flat groove (19).

5. The fixing structure of the splitting prism of claim 4, wherein a process groove is formed at the junction of the bottom wall surface of the flat groove (19) and the side wall surface of the mounting groove, the bottom wall surface of the process groove is flush with the bottom wall surface of the mounting groove, and one fixing hole (17a, 17b) of the plurality of fixing holes (17a, 17b) partially penetrates through the bottom wall surface of the flat groove (19) and partially penetrates through the bottom wall surface of the process groove.

6. The fixing structure of any one of claims 3 to 5, wherein the splitting prism (20) comprises a primary prism (21) and a secondary prism (22) bonded and fixed to the primary prism (21), the bottom heat conducting portion (61) is provided with adhesive dispensing holes (612) corresponding to the primary prism (21) and the secondary prism (22), respectively, and the inner openings of the adhesive dispensing holes (612) are gradually enlarged from bottom to top.

7. The fixing structure of a splitting prism according to claim 3, wherein the side step surfaces of the stepped recesses (18a, 18b, 18c) arranged corresponding to the first stopper surface (13) and the second stopper surface (14) are provided with a snap projection which abuts against the lower surface of the bottom heat conduction portion (61).

8. The fixing structure of claim 7, wherein the edge of the first mounting opening and the edge of the second mounting opening are formed with a mold release notch corresponding to the upward projection areas of the two locking protrusions, respectively.

9. The fixing structure of the beam splitter prism as claimed in claim 7 or 8, further comprising a light blocking member disposed on a side of the beam splitter prism (20) facing away from the second limiting surface (14), and disposed adjacent to the first limiting surface (13); the fixing holes (17a, 17b) are arranged in two, one fixing hole (17a, 17b) is arranged adjacent to the sealing strip (80), and the other fixing hole is arranged on the side, away from the light splitting prism (20), of the light blocking piece; the edge of the bottom heat conducting part (61) far away from the second limit surface (14) is provided with a lug, and one of the two through holes (611a, 611b) is arranged on the lug.

10. The fixing structure of a splitting prism according to claim 1, wherein the upper cover (30) is made of metal, a gap (63) is formed between the side heat dissipating part (62) and the outer side surface of the main chassis (10), and heat dissipating fins (621) are provided on the outer side surface of the side heat dissipating part (62).

11. The fixing structure of claim 1, further comprising a supporting member (40), wherein the elastic force of the elastic member (50) acts on the supporting member (40) to press the splitting prism (20) to the first and second limiting surfaces (13, 14) via the supporting member (40).

12. A projection optical machine comprising a DMD light modulator (100) and a lens (200), further comprising the fixing structure of the splitting prism according to any one of claims 1 to 11.