Projection light device and projection apparatus

Abstract

A projection light machine and a projection device relate to the technical field of display. The projection light machine comprises a display assembly which comprises a light-in surface, a light-out surface and a first end surface connected with the light-in surface and the light-out surface; the first radiator is located on the side, close to the first end face, of the display assembly and comprises a heat dissipation plate, the surface, close to the display assembly, of the heat dissipation plate is an arc-shaped surface, the arc-shaped surface protrudes towards the side away from the display assembly, in the first direction, the circumferential curvatures of at least two positions on the arc-shaped surface are different, and the first direction is the direction from the light inlet face to the light outlet face.

Description

Projection light machine and projection device TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a projection light machine and a projection device. BACKGROUND

[0002] The projection light machine is generally composed of a light source, an illumination lens, a display assembly, an imaging lens, a mirror and a lens. During projection, the light source emits light, which passes through the illumination lens, the display assembly and the imaging lens in turn and is reflected by the mirror to the screen through the lens.

[0003] SUMMARY

[0004] The present disclosure provides a projection light machine, comprising:

[0005] A display assembly, comprising an incident surface, an exit surface, and a first end surface connecting the incident surface and the exit surface;

[0006] A first heat sink located on a side close to the first end surface of the display assembly, comprising a heat dissipation plate, a surface of the heat dissipation plate close to the display assembly being an arc surface, the arc surface being convex to a side away from the display assembly, in a first direction, the circumferential curvatures of at least two positions on the arc surface being different, the first direction being a direction in which the incident surface points to the exit surface.

[0007] In some embodiments, the arc surface comprises:

[0008] A first arc region, a second arc region and a third arc region arranged in sequence along the first direction, the circumferential curvature of the second arc region being greater than the circumferential curvatures of the first arc region and the third arc region.

[0009] In some embodiments, along the first direction, the circumferential curvature of the first arc region gradually increases, and the circumferential curvature of the third arc region gradually decreases.

[0010] In some embodiments, the circumferential curvature variation rate of the third arc region is greater than or equal to the circumferential curvature variation rate of the first arc region.

[0011] In some embodiments, the third arc region comprises an edge arc region, the edge arc region being arranged away from the second arc region within the third arc region, and the circumferential curvature of the edge arc region being less than or equal to the circumferential curvature of the first arc region.

[0012] In some embodiments, the projection light machine further comprises:

[0013] A first fan; and

[0014] The air guide groove is located on the side of the display assembly away from the first heat sink and close to the air outlet of the first fan, and includes a first groove wall, a second groove wall, and a side wall connecting the first groove wall and the second groove wall. The air inlet of the air guide groove is arranged on the first groove wall and faces the air outlet of the first fan. The second groove wall is arranged opposite to the air outlet of the air guide groove. The connecting joint between the second groove wall and the side wall towards the inside of the air guide groove is a smooth curved surface, and the smooth curved surface protrudes towards the side away from the air inlet and the air outlet of the air guide groove.

[0015] In some embodiments, the smooth curved surface includes a first arc edge, a second arc edge, and a third arc edge connected in sequence. The first arc edge is located on the surface of the side wall close to the display assembly. The second arc edge is located at the connecting joint between the first groove wall and the second groove wall and the side wall. The third arc edge is located on the surface of the second groove wall towards the inside of the air guide groove. The connecting point between the second arc edge and the third arc edge is located at the edge of the air inlet of the air guide groove.

[0016] In some embodiments, the second groove wall is an arc-shaped structure. The arc-shaped structure, the first arc edge, and the second arc edge all protrude towards the side away from the air outlet of the air guide groove. The third arc edge protrudes towards the side away from the first arc edge and the second arc edge.

[0017] In some embodiments, the projection light machine further includes:

[0018] a lens; and

[0019] a reflector located on the light-out side of the display assembly and used for reflecting the incident light from the display assembly to the lens. The reflecting surface of the reflector is in the shape of a trapezoid, and the short side of the trapezoid is arranged close to the lens.

[0020] In some embodiments, the display assembly includes:

[0021] a display panel; and

[0022] a rubber frame located on the light-in side of the display panel. The rubber frame includes a frame body, a stop block, and a buckle structure arranged on the frame body. The stop block and the buckle structure are arranged on the two sides of the display panel opposite to each other. The stop block is used for limiting the display panel, and the buckle structure is used for fixing the display panel.

[0023] In some embodiments, the projection light machine further includes:

[0024] A first casing is connected and fixed with a lens of the projection light machine; and

[0025] A second casing is located on a side of the first casing away from the lens.

[0026] A plurality of connecting holes are arranged on the first casing and the second casing respectively, the connecting holes are used for penetrating a rigid connecting piece, the first casing and the second casing are connected and fixed through the rigid connecting piece, the plurality of connecting holes include a first connecting hole and a second connecting hole, and the first connecting hole and the second connecting hole have different hole diameters.

[0027] In some embodiments, the first connecting hole has a smaller hole diameter than the second connecting hole, and the first connecting hole is arranged close to the display assembly.

[0028] In some embodiments, the projection light machine further comprises:

[0029] A mirror is located on a light-out side of the display assembly, and is used for reflecting incident light from the display assembly.

[0030] A first casing is connected and fixed with a lens of the projection light machine; and

[0031] A second casing is located on a side of the first casing away from the lens, and is connected and fixed with the first casing, the second casing is arranged with a limiting groove, a first mounting surface and a mounting hole on a surface close to the first casing, the two limiting grooves are oppositely arranged on two sides of the mirror along a second direction, the first mounting surface is located on a side of the mirror close to the display assembly, and the mounting hole is located on a side of the mirror away from the first mounting surface, and the limiting groove and the first mounting surface are both used for limiting the mirror.

[0032] A mirror support is connected and fixed with the first casing, and a part of the mirror support penetrating through the mounting hole abuts against the mirror.

[0033] In some embodiments, the projection light machine further comprises:

[0034] A mirror is located on a light-out side of the display assembly, and is used for reflecting incident light from the display assembly.

[0035] A first casing is connected and fixed with a lens of the projection light machine; and

[0036] A second casing is located on a side of the first casing away from the lens, and is connected and fixed with the first casing.

[0037] The first shell is provided with a support part and a second mounting surface on the inner wall of the shell close to the second shell, the support part is used for supporting the edge of the reflecting surface of the mirror, a plurality of support parts are arranged oppositely and symmetrically along a second direction, and two second mounting surfaces are arranged oppositely along the second direction and located on the side of the support part away from the mirror;

[0038] The second shell is provided with a limiting strip and a third mounting surface on the surface close to the first shell, the limiting strip and the third mounting surface are arranged oppositely along a third direction on the two sides of the mirror, the third direction is perpendicular to the second direction, and the second mounting surface, the limiting strip and the third mounting surface are all used for limiting the mirror.

[0039] In some embodiments, the projection light machine further comprises:

[0040] Heat-insulating glass arranged on the light-entering side of the display assembly; and

[0041] An air guide groove located on the side of the display assembly and the heat-insulating glass away from the first heat sink, the surface of the air guide groove facing the first heat sink comprises a first plane and a first concave surface, the first concave surface is recessed relative to the first plane towards the side away from the first heat sink, the first plane abuts against the heat-insulating glass, and the first concave surface abuts against the display assembly.

[0042] In some embodiments, the projection light machine further comprises:

[0043] An imaging field lens arranged on the light-outgoing side of the display assembly; and

[0044] A second heat sink arranged on the side of the imaging field lens and the display assembly away from the first heat sink, the surface of the second heat sink close to the imaging field lens comprises a second plane and a first convex surface, the first convex surface is convex relative to the second plane towards the side close to the first heat sink, and the first convex surface abuts against the imaging field lens.

[0045] In some embodiments, the projection light machine further comprises:

[0046] A second shell located on the side of the display assembly away from the first heat sink;

[0047] A first fan located on the side of the second shell away from the first heat sink; and

[0048] A fan support located between the first fan and the second shell and used for fixing the first fan;

[0049] The second shell is in an integrated structure with the fan support.

[0050] In some embodiments, the projection light machine further comprises:

[0051] a second fan located on a side of the first heat sink away from the display assembly; and

[0052] a wind shield arranged around the second fan along an airflow direction of the second fan; and

[0053] The wind shield comprises a first part and a second part that can be disassembled, the first part has a first protruding part and a first recessed part near one end of the second part, the second part has a second protruding part and a second recessed part near one end of the first part, the first protruding part and the second recessed part are matched with each other, the first recessed part and the second protruding part are matched with each other, or the wind shield is in an integrated structure that cannot be disassembled.

[0054] In some embodiments, the projection light machine further comprises:

[0055] a second fan located on a side of the first heat sink away from the display assembly; and

[0056] a heat sink arranged on a side of the second fan away from the first heat sink, the heat sink and the second fan have a gap therebetween and are connected and fixed by a rigid connecting piece.

[0057] In some embodiments, the projection light machine further comprises:

[0058] a light cup located on an incident light side of the display assembly, comprising a cup body and a cup rim, the cup body is used to form a light channel, the cup rim is connected with the cup body near an edge of the display assembly and is bent away from the light channel; and

[0059] a first fan located on a side of the light cup away from the light channel, the minimum distance between the first fan and the cup rim is less than or equal to 2 mm.

[0060] The present disclosure provides a projection device, comprising:

[0061] a light machine shell comprising a containing cavity, and an air inlet hole and an air outlet hole in communication with the containing cavity; and

[0062] The projection light machine is arranged in the containing cavity.

[0063] In some embodiments, the gap between the air inlet hole and the projection light machine is a first gap, the gap between the air outlet hole and the projection light machine is a second gap, and the first gap is different from the second gap.

[0064] In some embodiments, the first gap is greater than the second gap.

[0065] In some embodiments, the light machine shell further comprises a first shell surface and a second shell surface oppositely arranged along the first direction, the gap between the first shell surface and the projection light machine is a third gap, the gap between the second shell surface and the projection light machine is a fourth gap, the third gap is equal to the fourth gap, the third gap and the fourth gap are greater than the second gap and less than the first gap.

[0066] The above description is only a summary of the technical solutions of the present disclosure. In order to enable a clearer understanding of the technical means of the present disclosure, the contents of the specification can be implemented, and in order to enable the above and other purposes, features and advantages of the present disclosure to be more apparent and easy to understand, the specific embodiments of the present disclosure are described below.

[0067] Brief Description of Drawings

[0068] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to these drawings without creative labor. It should be noted that the proportions in the drawings are only for illustration and do not represent the actual proportions.

[0069] FIG. 1 shows a partial cross-sectional structure schematic diagram of a projection light machine;

[0070] FIG. 2 shows a structure schematic diagram of a first heat sink;

[0071] FIG. 3 shows a variation curve of the circumferential curvature of the first heat sink along the first direction;

[0072] FIG. 4 shows a variation curve of the circumferential curvature of the first heat sink along the first direction in the related art;

[0073] FIG. 5 shows a structure schematic diagram of an air guide groove;

[0074] FIG. 6 shows a cross-sectional structure schematic diagram of a projection light machine;

[0075] FIG. 7 shows a planar structure schematic diagram of two kinds of reflecting mirrors;

[0076] FIG. 8 shows a structure schematic diagram of two kinds of display assemblies;

[0077] Fig. 9 shows a first assembly structure of the reflecting mirror;

[0078] Fig. 10 shows a second assembly structure of the reflecting mirror;

[0079] Fig. 11 shows a limiting structure of the display assembly;

[0080] Fig. 12 shows a first assembly structure of the first fan and the second casing;

[0081] Fig. 13 shows a second assembly structure of the first fan and the second casing;

[0082] Fig. 14 shows a structure of the first wind shield;

[0083] Fig. 15 shows a structure of the second wind shield;

[0084] Fig. 16 shows two assembly structures of the heat sink and the second fan;

[0085] Fig. 17 shows two assembly structures of the light cup and the first fan;

[0086] Fig. 18 shows an assembly structure of the first casing and the optical component;

[0087] Fig. 19 shows an exploded structure of the projection light machine in the first example;

[0088] Fig. 20 shows a structure of the projection light machine in the first example from a first perspective;

[0089] Fig. 21 shows a structure of the projection light machine in the first example from a second perspective;

[0090] Fig. 22 shows a structure of the projection light machine in the first example from a third perspective;

[0091] Fig. 23 shows a structure of the projection light machine in the first example from a fourth perspective;

[0092] Fig. 24 shows a structure of the projection light machine in the first example from a fifth perspective;

[0093] Fig. 25 shows a structure of the projection light machine in the first example from a sixth perspective;

[0094] Fig. 26 shows an exploded structure of the projection light machine in the second example;

[0095] Fig. 27 shows a structure of the projection light machine in the second example from a first perspective;

[0096] Fig. 28 shows a structural schematic diagram of the projection light machine in the second example at a second view angle;

[0097] Fig. 29 shows a structural schematic diagram of the projection light machine in the second example at a third view angle;

[0098] Fig. 30 shows a structural schematic diagram of the projection light machine in the second example at a fourth view angle;

[0099] Fig. 31 shows a structural schematic diagram of the projection light machine in the second example at a fifth view angle;

[0100] Fig. 32 shows a structural schematic diagram of the projection light machine in the second example at a sixth view angle;

[0101] Fig. 33 shows a schematic diagram of the size of two optical components;

[0102] Fig. 34 shows a structural schematic diagram of two first housings at different view angles;

[0103] Fig. 35 shows a structural schematic diagram of two second housings at different view angles;

[0104] Fig. 36 shows a structural schematic diagram of two projection light machines at different view angles;

[0105] Fig. 37 shows a sectional structural schematic diagram of a projection device.

[0106] DETAILED DESCRIPTION

[0107] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0108] The present disclosure provides a projection light machine, as shown in Fig. 1, which comprises a display assembly XS including an incident light surface S1, an outgoing light surface S2, and a first end surface S3 connecting the incident light surface S1 and the outgoing light surface S2; and a first heat sink 2 located at a side of the display assembly XS close to the first end surface S3.

[0109] As shown in Fig. 2, the first heat sink 2 comprises a heat dissipation plate JB, and the surface of the heat dissipation plate JB close to the display assembly XS is an arc surface S4, which protrudes away from the display assembly XS.

[0110] As shown in FIG. 2, a plurality of fins CP are arranged on the arc surface S4, and the plurality of fins CP are arranged on the arc surface S4 to increase the heat dissipation area and improve the heat exchange efficiency, and are also called heat dissipation fins or heat dissipation sheets. The fins CP can be made of metal materials such as aluminum or copper.

[0111] As shown in FIG. 3, in the first direction f1, the circumferential curvatures of at least two positions on the arc surface S4 are different, and the first direction f1 is the direction in which the light-in surface S1 points to the light-out surface S2.

[0112] As shown in FIG. 2, the arrangement direction of the plurality of fins CP is the axial direction fz, and the circumferential direction fr is the direction around the axial direction fz. The circumferential curvature is the curvature of the arc line extending along the circumferential direction fr on the arc surface S4, that is, the curvature of the arc line around the axial direction fz on the arc surface S4.

[0113] As shown in FIG. 1, the internal circulation heat dissipation path of the projection light machine is: the airflow flowing out of the first fan 8 flows through the air guide groove 9, then flows through the light-in surface S1 of the display assembly XS, then flows through the first heat sink 2, then flows to the light-out surface S2 of the display assembly XS, and finally flows to the first fan 8.

[0114] In the related art, as shown in FIG. 4, in the first direction f1, the circumferential curvatures of the arc surface S4 are constant values, for example, all are 0.143mm -1 .

[0115] In the present disclosure, as shown in FIG. 3, the circumferential curvatures of at least two positions on the arc surface S4 are different, that is, in the first direction f1, the circumferential curvatures of the arc surface S4 are variable values, rather than constant values.

[0116] As shown in FIG. 3, four positions P1, P2, P3 and P4 on the arc surface S4 are arranged in sequence along the first direction f1, and the circumferential curvatures of the positions P1, P2, P3 and P4 are, for example, 0.105mm -1 , 0.122mm -1 , 0.112mm -1 , and 0.071mm -1 , respectively. That is, the circumferential curvatures of the four positions P1, P2, P3 and P4 on the arc surface S4 shown in FIG. 3 are all different.

[0117] The projection light machine provided by the present disclosure can adjust the flow direction of the air by setting the circumferential curvatures of at least two positions on the arc surface S4 close to the display assembly XS on the side of the first heat sink 2, so that the airflow after passing through the first heat sink 2 flows more to the light-out surface S2 of the display assembly XS, thereby improving the heat dissipation efficiency of the display assembly XS and improving the display stability and service life of the display assembly XS.

[0118] Exemplarily, as shown in FIG. 3, the arc-shaped surface S4 comprises, in sequence along the first direction f1, a first arc-shaped region A1, a second arc-shaped region A2, and a third arc-shaped region A3, the circumferential curvature of the second arc-shaped region A2 is greater than the circumferential curvature of the first arc-shaped region A1 and the circumferential curvature of the third arc-shaped region A3.

[0119] Exemplarily, as shown in FIG. 3, along the first direction f1, the circumferential curvature of the first arc-shaped region A1 gradually increases, and the circumferential curvature of the third arc-shaped region A3 gradually decreases.

[0120] Exemplarily, the rate of change of the circumferential curvature of the third arc-shaped region A3 is greater than (as shown in FIG. 3) or equal to the rate of change of the circumferential curvature of the first arc-shaped region A1.

[0121] Exemplarily, as shown in FIG. 3, the third arc-shaped region A3 comprises an edge arc-shaped region A31, the edge arc-shaped region A31 is disposed away from the second arc-shaped region A2 within the third arc-shaped region A3, and the circumferential curvature of the edge arc-shaped region A31 is less than or equal to the circumferential curvature of the first arc-shaped region A1.

[0122] Exemplarily, in the first direction f1, the light-emitting surface S2 of the display assembly XS is located at the junction of the second arc-shaped region A2 and the third arc-shaped region A3.

[0123] In some embodiments, as shown in FIG. 1, the projection light machine further comprises a first fan 8 and a wind guide groove 9 located on the side of the display assembly XS away from the first heat sink 2, and the wind guide groove 9 is disposed close to the air outlet of the first fan 8.

[0124] As shown in FIG. 5a, the wind guide groove 9 comprises a first groove wall 51, a second groove wall 52, and a side wall 53 connecting the first groove wall 51 and the second groove wall 52, the air inlet of the wind guide groove 9 is disposed on the first groove wall 51 and faces the air outlet of the first fan 8, the second groove wall 52 is disposed opposite to the air outlet of the wind guide groove 9, the connecting joint between the second groove wall 52 and the side wall 53 towards the inside of the wind guide groove 9 is a smooth curved surface S5, and the smooth curved surface S5 protrudes towards the side away from the air inlet and the air outlet of the wind guide groove 9.

[0125] In the related art, as shown in FIG. 5b, the connecting joint between the second groove wall 52 and the side wall 53 towards the inside of the wind guide groove 9 is an abrupt corner joint LJF, and the airflow flowing out of the centrifugal fan forms a vortex at the corner joint LJF, causing part of the flow to be lost, resulting in poor heat dissipation of the display assembly XS.

[0126] In the present disclosure, as shown in a of FIG. 5, since the connecting joint between the second groove wall 52 and the side wall 53 towards the inside of the air guiding groove 9 is a smooth curved surface S5, the airflow from the centrifugal fan smoothly transitions at the smooth curved surface S5, avoiding vortex, thereby improving the heat dissipation effect of the display assembly XS.

[0127] Exemplarily, as shown in a of FIG. 5, the smooth curved surface S5 includes a first arc edge b1, a second arc edge b2 and a third arc edge b3 connected in sequence, the first arc edge b1 is located on the surface of the side wall 53 close to the display assembly XS, the second arc edge b2 is located at the connecting joint between the first groove wall 51 and the second groove wall 52 and the side wall 53 respectively, and the third arc edge b3 is located on the surface of the second groove wall 52 towards the inside of the air guiding groove 9, and the connecting point of the second arc edge b2 and the third arc edge b3 is located at the edge of the air inlet of the air guiding groove 9.

[0128] Exemplarily, as shown in a of FIG. 5, the second groove wall 52 is an arc structure, and the arc structure, the first arc edge b1 and the second arc edge b2 all protrude towards the side away from the air outlet of the air guiding groove 9, and the third arc edge b3 protrudes towards the side away from the first arc edge b1 and the second arc edge b2.

[0129] Exemplarily, as shown in a of FIG. 5, the two side walls 53 are oppositely arranged on the two sides of the first groove wall 51 and the second groove wall 52, and correspondingly, the two smooth curved surfaces S5 are oppositely arranged.

[0130] Exemplarily, as shown in FIG. 6, the projection light machine further comprises a lens 1, the lens 1 is used for projecting light onto an external screen.

[0131] Exemplarily, as shown in FIG. 6, the projection light machine further comprises a reflector 4, which is located on the light emitting side of the display assembly XS and is used for reflecting the incident light from the display assembly XS.

[0132] Exemplarily, as shown in FIG. 6, the reflecting surface of the reflector 4 is arranged towards the first shell 3, and is used for reflecting the incident light from the display assembly XS to the lens 1.

[0133] Exemplarily, as shown in FIG. 7, the reflecting surface of the reflector 4 is in the shape of a trapezoid, and the short side of the trapezoid is arranged close to the lens 1. In this way, the size and weight of the projection light machine can be reduced, and the cost can be saved.

[0134] Exemplarily, as shown in FIG. 7, the size of the short side of the trapezoidal reflector 4 is greater than or equal to 60mm and less than or equal to 75mm, such as 73.83mm as shown in b of FIG. 7.

[0135] Exemplarily, as shown in FIG. 7, the size of the long side of the trapezoidal reflector 4 is greater than or equal to 100mm and less than or equal to 120mm, such as 111mm as shown in a of FIG. 7, or 109.6mm as shown in b of FIG. 7.

[0136] Exemplarily, as shown in FIG. 7, the distance between the long side and the short side of the trapezoidal reflector 4 is greater than or equal to 70 mm and less than or equal to 100 mm, such as 89 mm as shown by a in FIG. 7, or 78 mm as shown by b in FIG. 7.

[0137] It should be noted that the shape of the reflector 4 can also be a rectangle, a parallelogram, etc., which is not limited in the present disclosure.

[0138] In some embodiments, as shown by a in FIG. 8, the display assembly XS includes the display panel 6, the glue frame 24, and the metal frame 26. The glue frame 24 and the metal frame 26 jointly limit and fix the display panel 6.

[0139] In order to reduce the weight of the projector, in some embodiments, as shown by b in FIG. 8, the display assembly XS includes the display panel 6, and the glue frame 24 located on the light-in side of the display panel 6. The glue frame 24 includes a frame body 81, and a limiting block 82 and a buckle structure 83 arranged on the frame body 81. The limiting block 82 and the buckle structure 83 are arranged on two sides of the display panel 6, respectively. The limiting block 82 is used to limit the display panel 6, and the buckle structure 83 is used to fix the display panel 6.

[0140] In this way, the display panel 6 can be limited and fixed by the glue frame 24, and the metal frame 26 is not needed, so that the size and weight of the projector can be further reduced, the assembly efficiency can be improved, and the cost can be reduced.

[0141] Exemplarily, two limiting blocks 82 are located on one side of the display panel 6 along the long side direction, and two buckle structures 83 are located on the other side of the display panel 6 along the long side direction. The positions of the two limiting blocks 82 and the two buckle structures 83 can be symmetrically arranged.

[0142] Exemplarily, as shown in FIG. 6, the projector further includes a first casing 3 connected and fixed with the lens 1 of the projector.

[0143] Exemplarily, as shown in FIG. 6, the projector further includes a second casing 7 located on the side of the first casing 3 away from the lens 1 and connected and fixed with the first casing 3. The second casing 7 is also located on the side of the display assembly XS away from the first heat sink 2.

[0144] Exemplarily, as shown in FIGS. 34 and 35, a plurality of connecting holes LJK are arranged on the second casing 7 and the first casing 3, respectively. The connecting holes LJK are used to pass through rigid connecting pieces. The second casing 7 and the first casing 3 are connected and fixed by the plurality of rigid connecting pieces.

[0145] Exemplarily, the plurality of connecting holes LJK includes a first connecting hole LJK1 and a second connecting hole LJK2, and the first connecting hole LJK1 and the second connecting hole LJK2 have different hole diameters.

[0146] Exemplarily, as shown in FIGS. 34 and 35, the first connecting hole LJK1 has a smaller hole diameter than the second connecting hole LJK2, and the first connecting hole LJK1 is arranged close to the display assembly XS.

[0147] By arranging the first connecting hole LJK1 with a smaller hole diameter, the size of the first casing 3 and the second casing 7 can be reduced, the weight of the first casing 3 and the second casing 7 can be reduced, and the cost can be saved.

[0148] Exemplarily, an ST2.0 screw can be used to pass through the second casing 7 and the first connecting hole LJK1 on the first casing 3, and an ST2.6 screw can be used to pass through the second casing 7 and the second connecting hole LJK2 on the first casing 3, so as to connect and fix the second casing 7 and the first casing 3.

[0149] The fixing manner of the mirror 4 is exemplarily described below.

[0150] In some examples, as shown in FIG. 9, the second casing 7 is arranged with a limiting groove XWC, a first mounting surface AZM1 and a mounting hole AZK on the surface close to the first casing 3, the two limiting grooves XWC are oppositely arranged on the two sides of the mirror 4 along the second direction f2, the first mounting surface AZM1 is located on the side of the mirror 4 close to the display assembly XS, and the mounting hole AZK is located on the side of the mirror 4 away from the first mounting surface AZM1, the limiting groove XWC and the first mounting surface AZM1 are both used for limiting the mirror 4.

[0151] In this example, as shown in FIG. 9, the projection light machine further includes a mirror support ZJ1 connected and fixed with the first casing 3, and the part of the mirror support ZJ1 passing through the mounting hole AZK abuts against the mirror 4.

[0152] During installation, the mirror 4 is pre-installed into the limiting groove XWC on the second casing 7 through the mounting hole AZK, the first mounting surface AZM1 limits the mirror 4, then the second casing 7 and the first casing 3 are connected and fixed, and finally the mirror support ZJ1 is installed on the first casing 3 while limiting the mirror 4.

[0153] In this example, the mirror 4 is limited and fixed by the first casing 3, the second casing 7 and the mirror support ZJ1.

[0154] Exemplarily, as shown in FIG. 9, the mirror support ZJ1 includes a first panel MB1, and a second panel MB2 and a third panel MB3 which are located on the same side of the first panel MB1 and are connected with the first panel MB1 perpendicularly, the second panel MB2 and the third panel MB3 are arranged separately from each other, the first panel MB1 is located outside the mounting hole AZK, the second panel MB2 and the third panel MB3 pass through the mounting hole AZK, the second panel MB2 abuts against the first casing 3, and the third panel MB3 abuts against the mirror 4.

[0155] Exemplarily, as shown in FIG. 9, the distance between the surface of the third panel MB3 away from the first panel MB1 and the first panel MB1 is greater than the distance between the surface of the second panel MB2 away from the first panel MB1 and the first panel MB1.

[0156] Exemplarily, as shown in FIG. 9, the thickness of the first panel MB1 is, for example, 1.8 mm.

[0157] In other examples, as shown in FIG. 10, the first casing 3 is provided with a support portion ZCB and a second mounting surface AZM2 on the inner wall of the shell of the second casing 7, the support portion ZCB is used for supporting the edge of the reflecting surface of the mirror 4, a plurality of support portions ZCB are arranged oppositely and symmetrically along the second direction f2, and the two second mounting surfaces AZM2 are arranged oppositely along the second direction f2 and are located on the side away from the mirror 4.

[0158] As shown in FIG. 10, the second casing 7 is provided with a limiting strip XWT and a third mounting surface AZM3 on the surface close to the first casing 3, the limiting strip XWT and the third mounting surface AZM3 are arranged oppositely along the third direction f3 on the two sides of the mirror 4, the third direction f3 is perpendicular to the second direction f2, and the second mounting surface AZM2, the limiting strip XWT and the third mounting surface AZM3 are all used for limiting the mirror 4.

[0159] In this example, the mirror support ZJ1 is cancelled, and the mirror 4 is limited and fixed by the first casing 3 and the second casing 7, so that the height of the projection light machine along the first direction f1 is reduced from 186.6 mm in the first example to 184.8 mm, which is reduced by 1.8 mm.

[0160] Exemplarily, as shown in FIG. 11, the projection light machine further includes: a heat insulation glass 23 arranged on the light entering side of the display assembly XS.

[0161] Exemplarily, as shown in FIG. 6, the projection light machine further includes: an air guide groove 9 located on the side away from the first heat sink 2 of the display assembly XS and the heat insulation glass 23.

[0162] In order to limit the positions of the heat insulation glass 23 and the display assembly XS, as shown in FIG. 11, the surface of the air guide groove 9 facing the first heat sink 2 includes a first plane PM1 and a first concave surface AM1, the first concave surface AM1 is recessed relative to the first plane PM1 towards the side away from the first heat sink 2, the first plane PM1 abuts the heat insulation glass 23, and the first concave surface AM1 abuts the display assembly XS.

[0163] As shown in FIG. 11, the projection light machine further includes an imaging field lens 5 arranged on the light emitting side of the display assembly XS.

[0164] As shown in FIG. 11, the projection light machine further includes a second heat sink 10 arranged on the side of the imaging field lens 5 and the display assembly XS away from the first heat sink 2.

[0165] In order to limit the position of the imaging field lens 5, as shown in FIG. 11, the surface of the second heat sink 10 close to the imaging field lens 5 includes a second plane PM2 and a first convex surface TM1, the first convex surface TM1 is convex relative to the second plane PM2 towards the side close to the first heat sink 2, and the first convex surface TM1 abuts the imaging field lens 5.

[0166] As shown in FIG. 11, the second plane PM2 abuts the second casing 7.

[0167] As shown in FIGS. 12 and 13, the projection light machine further includes a first fan 8 arranged on the side of the second casing 7 away from the first heat sink 2, and a fan bracket 27 arranged between the first fan 8 and the second casing 7 for fixing the first fan 8.

[0168] In some examples, as shown in FIG. 12, the second casing 7 and the fan bracket 27 are independent structures. For example, the fan bracket 27 and the second casing 7 are connected by screws, and the fan bracket 27 and the first fan 8 are connected by screws.

[0169] In other examples, as shown in FIG. 13, the second casing 7 and the fan bracket 27 are integrated structures. In this way, the size and weight of the projection light machine can be further reduced, and the sealing performance of the projection light machine can be improved, and the dustproof performance can be improved. As shown in FIG. 35, the total width of the projection light machine in the width direction is reduced from 124 mm to 123 mm, and the main body width is reduced from 123 mm to 115 mm.

[0170] In some embodiments, as shown in FIGS. 14 and 15, the projection light machine further includes a second fan 16 arranged on the side of the first heat sink 2 away from the display assembly XS.

[0171] In some embodiments, as shown in FIGS. 14 and 15, the projection light machine further comprises a wind shield 15, which is arranged around the second fan 16 along the airflow direction of the second fan 16.

[0172] In some examples, as shown in FIG. 14, the wind shield 15 comprises a first part 28 and a second part 29, the first part 28 has a first protruding portion TB1 and a first recessed portion AB1 at one end close to the second part 29, the second part 29 has a second protruding portion TB2 and a second recessed portion AB2 at one end close to the first part 28, the first protruding portion TB1 and the second recessed portion AB2 match each other, and the first recessed portion AB1 and the second protruding portion TB2 match each other.

[0173] In other examples, as shown in FIG. 15, the wind shield 15 is an integral structure that cannot be disassembled. In this way, the size and weight of the projection light machine can be further reduced, and the assembly efficiency can be improved.

[0174] As shown in FIGS. 14 and 15, the width of the wind shield 15 is reduced from 129.4 mm to 101.2 mm, and the length is reduced from 100 mm to 86.442 mm.

[0175] In some embodiments, as shown in FIG. 16, the projection light machine further comprises a heat sink 11 arranged on the side of the second fan 16 away from the first heat sink 2, and the heat sink 11 and the second fan 16 have a gap therebetween.

[0176] For example, a 4 mm gap is reserved between the heat sink 11 and the second fan 16, which can play a role in shock absorption and noise reduction.

[0177] In some examples, as shown in a of FIG. 16, the heat sink 11 and the second fan 16 are not fixedly connected.

[0178] In other examples, as shown in b of FIG. 16, the heat sink 11 and the second fan 16 are fixedly connected through a rigid connecting piece. In this way, on the one hand, the shock absorption and noise reduction can be improved, and on the other hand, the support force of the heat sink 11 can be improved.

[0179] For example, as shown in b of FIG. 16, the heat sink 11 and the second fan 16 are fixedly connected through four rigid connecting pieces passing through four second connecting holes LJK2 arranged on the heat sink 11, and the four second connecting holes LJK2 are arranged close to the four inner corners of the heat sink 11.

[0180] For example, the rigid connecting piece is a screw, and the heat sink 11 and the second fan 16 are locked through four screws.

[0181] In some embodiments, as shown in FIG. 17, the projection light engine further comprises: a light cup 21 located at the light-in side of the display assembly XS, the light cup 21 comprising a cup body 171 for forming a light passage 173 and a cup edge 172 connected with the cup body 171 near the edge of the display assembly XS and bent towards the side away from the light passage 173; and a first fan 8 located at the side of the light cup 21 away from the light passage 173.

[0182] Exemplarily, as shown in a of FIG. 17, the minimum distance between the first fan 8 and the cup edge 172 of the light cup 21 is about 6.8 mm.

[0183] In order to further reduce the size of the projection light engine, exemplarily, as shown in b of FIG. 17, the minimum distance between the first fan 8 and the cup edge 172 of the light cup 21 is less than or equal to 2 mm, and in b of FIG. 17, the minimum distance between the first fan 8 and the cup edge 172 of the light cup 21 is 0 mm.

[0184] Exemplarily, as shown in FIG. 17, the size of the light passage 173 gradually increases in the direction close to the display assembly XS.

[0185] Exemplarily, as shown in a of FIG. 17, the thickness of the first fan 8 is 22 mm.

[0186] In order to further reduce the size of the projection light engine, exemplarily, as shown in b of FIG. 17, the thickness of the first fan 8 is 15 mm.

[0187] As shown in FIG. 17, a second heat sink 10 is further arranged at the side of the first fan 8 away from the light cup 21.

[0188] Exemplarily, in a of FIG. 17, the fin height of the second heat sink 10 away from the first fan 8 is 2 mm, and in b of FIG. 17, the fin height of the second heat sink 10 away from the first fan 8 is 0.746 mm, so that the total width of the light cup 21, the first fan 8 and the second heat sink 10 is reduced from 112.43 mm to 97.38 mm, and the size is reduced by 15.05 mm.

[0189] In the present disclosure, the first heat sink 2 is exemplarily a corner heat sink, and the second heat sink 10 is exemplarily a cast aluminum heat sink.

[0190] In the present disclosure, the first fan 8 is exemplarily a centrifugal fan, and the second fan 16 is exemplarily an axial fan.

[0191] As shown in Fig. 18, a plurality of mounting slots AZC are provided on the first casing 3, the light cup 21 and the illumination lens 22 are mounted in the same mounting slot AZC1, the heat insulation glass 23 is mounted in another mounting slot AZC2, the display assembly XS is mounted in another mounting slot AZC3, and the imaging lens 5 is mounted in another mounting slot AZC4. The illumination lens 22, the heat insulation glass 23, the display assembly XS, and the display assembly XS are arranged in sequence along the first direction f1.

[0192] The overall structure of the projection light machine will be described below with reference to Figs. 19 to 32. Fig. 19 shows an exploded structural schematic diagram of a first projection light machine. Figs. 20 to 25 show schematic diagrams of the overall structure of the first projection light machine from different viewing angles. Fig. 26 shows an exploded structural schematic diagram of a second projection light machine. Figs. 27 to 32 show schematic diagrams of the overall structure of the second projection light machine from different viewing angles.

[0193] As shown in Fig. 19 or Fig. 26, the projection light machine is a vertical closed small-volume projection light machine, which comprises a lens 1, a first heat sink 2, a first casing 3, a reflector 4, an imaging lens 5, a display panel 6, a second casing 7, a first fan 8, a wind guide slot 9, a second heat sink 10, a heat dissipation fin 11, a first heat pipe 12, a second heat pipe 13, a heat pipe copper base 14, a wind shield 15, a second fan 16, a first light cup heat sink 17, a second light cup heat sink 18, a light source base 19, a light source 20, a light cup 21, an illumination lens 22, a heat insulation glass 23, and a rubber frame 24.

[0194] The first casing 3, the second casing 7, the first heat sink 2, the second heat sink 10, and the lens 1 form a sealed cavity, and the reflector 4, the imaging lens 5, the display panel 6, the rubber frame 24, the heat insulation glass 23, the illumination lens 22, the light source base 19, the light source 20, the light cup 21, the first fan 8, and the wind guide slot 9 are arranged inside the sealed cavity. The wind shield 15, the second fan 16, the first heat pipe 12, the second heat pipe 13, and the heat dissipation fin 11 are located on the lower side of the lens 1. The heat pipe copper base 14 is below the light source base 19, and the first fan 8 and the wind guide slot 9 are included between the second casing 7 and the second heat sink 10. The light cup heat sink 17 / 18 is connected to the light cup 21 by thermal conductive glue.

[0195] The first casing 3 and the second casing 7 form the main body of the light machine, which serves as a carrier for mounting optical components and heat dissipation components, and plays a sealing and bearing role.

[0196] The flattened ends of the first heat pipe 12 and the second heat pipe 13 are welded together with the heat pipe copper base 14, and the unflattened ends of the first heat pipe 12 and the second heat pipe 13 are welded together with the radiating fin 11, and the radiating fin 11, the first heat pipe 12, the second heat pipe 13 and the heat pipe copper base 14 together constitute a light source radiating module. The display panel 6 and the rubber frame 24 are positioned by the outer contour, and are fixed by buckling, to form a display assembly XS. The light source base 19 and the light source 20 constitute a light source assembly.

[0197] As shown in FIG. 1, the first radiator 2, the imaging lens 5, the display panel 6, the first fan 8, the air guide groove 9, the second radiator 10, the illumination lens 22 and the heat insulation glass 23 constitute an internal radiating air duct. The airflow discharged by the first fan 8 flows through the air guide groove 9, the light entrance surface S1 of the display assembly XS, the surface of the illumination lens 22 close to the heat insulation glass 23, the surface of the heat insulation glass 23 close to and away from the illumination lens 22, the light exit surface S2 of the display assembly XS and the surface of the imaging lens 5 close to the display assembly XS, and finally returns to the first fan 8 after passing through the first radiator 2.

[0198] The light source assembly and the light source radiating module are locked and fixed to the main body of the light machine by four screws.

[0199] Exemplarily, the diameters of the first heat pipe 12 and the second heat pipe 13 are φ8mm.

[0200] Exemplarily, the second fan 16 and the light source radiating module are locked on the wind shield 15 by four screws.

[0201] In FIG. 19 and FIG. 26, the first radiator 2 and the second radiator 10 play the roles of sealing, limiting and radiating. The first radiator 2 is locked and fixed to the first casing 3 by four screws, and the second radiator 10 is locked and fixed to the second casing 7 by four screws.

[0202] In FIG. 19, the projection light machine further comprises a mirror support 25, a metal frame 26 and a fan support 27. Moreover, the wind shield 15 comprises a first part 28 and a second part 29 which can be disassembled.

[0203] In FIG. 19, the first fan 8 is locked on the fan support 27 by three screws, the air guide groove 9 is locked on the fan support 27 by two screws, and the fan support 27 is locked on the second casing 7 by screws.

[0204] In FIG. 26, the wind shield 15 is a one-piece structure, and the second casing 7 and the fan support 27 are a one-piece structure.

[0205] In FIG. 26, the first fan 8 is locked on the second casing 7 by three screws, and the air guide groove 9 is locked on the second casing 7 by two screws.

[0206] Exemplarily, the imaging lens 5, the display panel 6, the optical element such as the illumination lens 22 and the heat insulation glass 23 are in the shape of a rectangle, and the long side dimension of the rectangle is less than or equal to 120 mm. For example, the long side dimension of the projection light machine shown in FIG. 19 is 112 mm (as shown in FIG. 33a), and the long side dimension of the projection light machine shown in FIG. 26 is 109.6 mm (as shown in FIG. 33b), which is reduced by 1.2 mm.

[0207] It should be noted that a in FIG. 34 is a schematic view of the first casing 3 in the projection light machine shown in FIG. 19 at different viewing angles, and b in FIG. 34 is a schematic view of the first casing 3 in the projection light machine shown in FIG. 26 at different viewing angles. a in FIG. 35 is a schematic view of the second casing 7 in the projection light machine shown in FIG. 19 at different viewing angles, and b in FIG. 35 is a schematic view of the second casing 7 in the projection light machine shown in FIG. 26 at different viewing angles.

[0208] a in FIG. 36 is a schematic view of the projection light machine shown in FIG. 19 at different viewing angles, and b in FIG. 36 is a schematic view of the projection light machine shown in FIG. 26 at different viewing angles.

[0209] On the basis of meeting heat dissipation, the heat pipe is adjusted from φ8 to φ6, as shown in FIG. 36, and the width direction of the light source heat dissipation module on the side of the ultra-wide side is reduced from 16.7 mm to 11.2 mm, and the total width of the light source heat dissipation module is 113.8 mm.

[0210] In the process of assembling the projection light machine shown in FIG. 19, the mirror 4 can be first pre-installed on the second casing 7 through the slot, then the light cup 21 and the illumination lens 22 are installed in the same installation slot AZC of the first casing 3, then the second casing 7 and the first casing 3 are locked by four screws to fix the mirror 4, the light cup 21 and the illumination lens 22. Then, the mirror support 25 is locked on the first casing 3 by four screws to limit the up-down direction of the mirror 4. Then, the imaging lens 5, the display assembly XS and the heat insulation glass 23 are inserted into the corresponding installation slot AZC, and the lens 1 is locked on the first casing 3 by four screws through contour positioning.

[0211] In the process of assembling the projection light machine shown in FIG. 26, the light cup 21 and the illumination lens 22 can be first installed in the same installation slot AZC of the first casing 3, and the mirror 4 is placed on the support part ZCB (such as four ribs) of the first casing 3, and the support part ZCB is used to support the mirror 4, then the second casing 7 and the first casing 3 are locked by four screws to fix the mirror 4, the light cup 21 and the illumination lens 22. Then, the imaging lens 5, the display assembly XS and the heat insulation glass 23 are inserted into the corresponding installation slot AZC, and the lens 1 is locked on the first casing 3 by four screws through contour positioning.

[0212] Compared with the projection light machine shown in FIG. 19, the projection light machine shown in FIG. 26 has fewer parts, smaller volume and weight, simplified assembly steps, and lower cost.

[0213] The projection light machine provided by the present disclosure has fewer parts, compact structure, small volume, can be designed according to the size of the display assembly XS, good dustproof performance, high product reliability, good heat dissipation effect, long service life, and low cost.

[0214] Exemplarily, the total volume of the projection light machine is less than or equal to 5L.

[0215] Exemplarily, the outer dimensions of the projection light machine shown in FIG. 19 are, for example, 186.6mm×129.4mm×192.25mm, and the total volume is <4.7L.

[0216] Exemplarily, the outer dimensions of the projection light machine shown in FIG. 26 are, for example, 184.8mm×123mm×172mm, and the total volume is ≤4.0L.

[0217] The present disclosure provides a projection device, as shown in FIG. 37, which comprises a light machine shell 371 including a containing cavity, and an air inlet hole 372 and an air outlet hole 373 communicating with the containing cavity; and a projection light machine 374 provided by any one of the embodiments, which is arranged in the containing cavity.

[0218] The projection device provided by the present disclosure is, for example, a projector.

[0219] Exemplarily, the gap between the air inlet hole 372 and the projection light machine 374 is a first gap C, the gap between the air outlet hole 373 and the projection light machine 374 is a second gap A, and the first gap C is different from the second gap A.

[0220] By setting the first gap C and the second gap A to be different, the heat dissipation effect of the projection light machine 374 can be improved.

[0221] Exemplarily, the first gap C is greater than the second gap A.

[0222] Exemplarily, the light machine shell 371 further comprises a first shell surface KM1 and a second shell surface KM2 oppositely arranged along a first direction f1, the gap between the first shell surface KM1 and the projection light machine 374 is a third gap B, and the gap between the second shell surface KM2 and the projection light machine 374 is a fourth gap D. Among them, the third gap B, the first gap C and the second gap A are different from each other, and the fourth gap D, the first gap C and the second gap A are different from each other.

[0223] Further, the third gap B is equal to the fourth gap D, the third gap B and the fourth gap D are greater than the second gap A and less than the first gap C.

[0224] As shown in FIG. 37, the outer circulation cooling path of the projector 374 is: the air inlet hole 372→the second heat sink 10→the bottom of the projector→the second fan 16→the cooling fins 11→the air outlet hole 373→out of the whole system.

[0225] Exemplarily, the second gap A is 4 mm, the third gap B is 5 mm, the first gap C is 6 mm, and the fourth gap D is 5 mm.

[0226] In the present disclosure, the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0227] In the present disclosure, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations.

[0228] In the present disclosure, the meaning of "multiple" is two or more, and the meaning of "at least one" is one or more, unless otherwise explicitly specified. "At least one of A, B, and C" has the same meaning as "at least one of A, B, or C", and includes the following combinations of A, B, and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B, and C. "A and / or B" includes the following three combinations: only A, only B, and a combination of A and B.

[0229] In the present disclosure, the use of "for" or "configured to" means open and inclusive language that does not exclude devices that are adapted to or configured to perform additional tasks or steps.

[0230] As used in the present disclosure, "about", "approximately", or "approximately" includes the stated value and the average value within an acceptable deviation range of the specific value, wherein the acceptable deviation range is determined by considering the measurement being discussed and the error related to the measurement of the specific quantity (i.e., the limitations of the measurement system) by a person of ordinary skill in the art.

[0231] As used in the present disclosure, "parallel," "perpendicular," "equal," "flush" include the recited condition and conditions approximating the recited condition within an acceptable deviation range, as determined by one of ordinary skill in the art taking into account the measurement being discussed and the error associated with the particular measurement (i.e., limitations of the measurement system). For example, "parallel" includes absolute parallel and near parallel, where near parallel can have an acceptable deviation range of, for example, within 5°; "perpendicular" includes absolute perpendicular and near perpendicular, where near perpendicular can also have an acceptable deviation range of, for example, within 5°. "Equal" includes absolute equal and near equal, where near equal can have an acceptable deviation range of, for example, a difference between the two that is less than or equal to 5% of either. "Flush" includes absolute flush and near flush, where near flush can have an acceptable deviation range of, for example, a distance between the two that is less than or equal to 5% of either.

[0232] The present disclosure describes example embodiments with reference to cross-sectional and / or plan view illustrations that are schematic illustrations of idealized embodiments. In the drawings, the thickness of layers and regions are exaggerated for clarity. Accordingly, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, the examples embodiments should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region illustrated as a rectangle will typically have rounded or curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the examples embodiments.

[0233] It should be noted finally that the above examples are only used to illustrate the technical solutions of the present disclosure, rather than limit them; even though the present disclosure has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for some technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A projector, comprising: a display assembly comprising an entrance surface, an exit surface, and a first end surface connecting the entrance surface and the exit surface; a first heat sink located on a side close to the first end surface of the display assembly, comprising a heat sink plate, a surface of the heat sink plate close to the display assembly being an arc surface, the arc surface being convex towards a side away from the display assembly, in a first direction, circumferential curvatures of at least two positions on the arc surface being different, the first direction being a direction in which the entrance surface points to the exit surface.

2. The projection engine of claim 1, wherein, the arc surface comprising: a first arc region, a second arc region, and a third arc region arranged in sequence along the first direction, a circumferential curvature of the second arc region being greater than circumferential curvatures of the first arc region and the third arc region.

3. The projection engine of claim 2, wherein, along the first direction, the circumferential curvature of the first arc region gradually increases, and the circumferential curvature of the third arc region gradually decreases.

4. The projection engine of claim 3, wherein, a rate of change of the circumferential curvature of the third arc region is greater than or equal to a rate of change of the circumferential curvature of the first arc region.

5. The projection engine of claim 2, wherein, the third arc region comprises an edge arc region, the edge arc region being located away from the second arc region within the third arc region, a circumferential curvature of the edge arc region being less than or equal to the circumferential curvature of the first arc region.

6. The projection engine of claim 1, wherein, the projector further comprising: a first fan; and an air guide groove located on a side of the display assembly away from the first heat sink and close to an air outlet of the first fan, comprising a first groove wall, a second groove wall, and a side wall connecting the first groove wall and the second groove wall, the first groove wall being provided with an air inlet of the air guide groove, and the air inlet of the air guide groove being arranged towards the air outlet of the first fan, the second groove wall being arranged opposite to an air outlet of the air guide groove, a connecting joint of the second groove wall and the side wall towards the inside of the air guide groove being a smooth curved surface, the smooth curved surface being convex towards a side away from the air inlet and the air outlet of the air guide groove.

7. The projection engine of claim 6, wherein, the smooth curved surface comprising a first arc edge, a second arc edge, and a third arc edge arranged in sequence and connected end to end, the first arc edge being located on a surface of the side wall close to the display assembly, the second arc edge being located at a connecting joint of the first groove wall and the second groove wall and the side wall, and the third arc edge being located on a surface of the second groove wall towards the inside of the air guide groove, a connecting point of the second arc edge and the third arc edge being located at an edge of the air inlet of the air guide groove.

8. The projection engine of claim 7, wherein, the second groove wall being an arc structure, the arc structure, the first arc edge, and the second arc edge being convex towards a side away from the air outlet of the air guide groove, and the third arc edge being convex towards a side away from the first arc edge and the second arc edge.

9. The projection printer according to any one of claims 1 to 8, wherein, the projector further comprising: a lens; and a reflector located on an exit side of the display assembly, configured to reflect incident light from the display assembly to the lens, a reflecting surface of the reflector being shaped as a trapezoid, and a short side of the trapezoid being close to the lens.

10. The projection printer according to any one of claims 1 to 8, wherein, the display assembly comprising: a display panel; and A frame is located on the light-incident side of the display panel. The frame includes a frame body, a stop block and a snap-fit ​​structure disposed on the frame body. The stop block and the snap-fit ​​structure are disposed opposite to each other on both sides of the display panel. The stop block is used to limit the position of the display panel, and the snap-fit ​​structure is used to fix the display panel.

11. The projection printer according to any one of claims 1 to 8, wherein, The projection optical engine also includes: The first housing is connected and fixed to the lens of the projection optical engine; and The second housing is located on the side of the first housing furthest from the lens; The first housing and the second housing are each provided with a plurality of connecting holes, which are used to pass through rigid connecting members, and the first housing and the second housing are connected by the rigid connecting members. Fixed, the plurality of connecting holes include a first connecting hole and a second connecting hole, wherein the diameters of the first connecting hole and the second connecting hole are different.

12. The projection engine of claim 11, wherein, The diameter of the first connecting hole is smaller than that of the second connecting hole, and the first connecting hole is located close to the display component.

13. The projection printer according to any one of claims 1 to 8, wherein, The projection optical engine also includes: A reflector, located on the light-emitting side of the display component, is used to reflect incident light from the display component; The first housing is connected and fixed to the lens of the projection optical engine; A second housing, located on the side of the first housing away from the lens, is connected and fixed to the first housing. A limiting groove, a first mounting surface, and a mounting hole are provided on the surface of the second housing near the first housing. Two limiting grooves are arranged opposite each other on both sides of the reflector along a second direction. The first mounting surface is located on the side of the reflector near the display component, and the mounting hole is located on the side of the reflector away from the first mounting surface. Both the limiting groove and the first mounting surface are used to limit the position of the reflector. The reflector bracket is connected and fixed to the first housing, and the portion of the reflector bracket passing through the mounting hole abuts against the reflector.

14. The projection printer according to any one of claims 1 to 8, wherein, The projection optical engine also includes: A reflector, located on the light-emitting side of the display component, is used to reflect incident light from the display component; The first housing is connected and fixed to the lens of the projection optical engine; and The second housing is located on the side of the first housing away from the lens and is connected and fixed to the first housing; The first housing has a support portion and a second mounting surface on the inner wall of the housing near the second housing. The support portion is used to support the edge of the reflective surface of the reflector. Multiple support portions are arranged opposite to each other and symmetrically along the second direction. Two second mounting surfaces are arranged opposite to each other along the second direction and are located on the side of the support portion away from the reflector. A limiting strip and a third mounting surface are provided on the surface of the second housing near the first housing. The limiting strip and the third mounting surface are arranged opposite each other on both sides of the reflector along a third direction. The third direction is perpendicular to the second direction, and the second mounting surface, the limiting strip, and the third mounting surface are all used to limit the position of the reflector.

15. The projection printer according to any one of claims 1 to 8, wherein, The projection optical engine also includes: Heat-insulating glass is disposed on the light-incident side of the display assembly; and A wind guide groove is located on a side of the display assembly and the heat insulation glass away from the first heat sink, a surface of the wind guide groove facing the first heat sink comprises a first plane and a first concave surface, the first concave surface is recessed relative to the first plane towards a side away from the first heat sink, the first plane is in abutment with the heat insulation glass, and the first concave surface is in abutment with the display assembly.

16. The projection printer according to any one of claims 1 to 8, wherein, The projection light machine further comprises: An imaging field lens is arranged on a light-outgoing side of the display assembly; and A second heat sink is arranged on a side of the imaging field lens and the display assembly away from the first heat sink, a surface of the second heat sink close to the imaging field lens comprises a second plane and a first convex surface, the first convex surface is convex relative to the second plane towards a side close to the first heat sink, and the first convex surface is in abutment with the imaging field lens.

17. The projection printer according to any one of claims 1 to 8, wherein, The projection light machine further comprises: A second machine shell is located on a side of the display assembly away from the first heat sink; A first fan is located on a side of the second machine shell away from the first heat sink; and A fan support is located between the first fan and the second machine shell, and is used for fixing the first fan; The second machine shell and the fan support are an integral structure.

18. The projection printer according to any one of claims 1 to 8, wherein, The projection light machine further comprises: A second fan is located on a side of the first heat sink away from the display assembly; and A wind shield is arranged around the second fan in the airflow direction of the second fan; and The wind shield comprises a first part and a second part which can be disassembled, the first part has a first convex part and a first concave part at one end close to the second part, the second part has a second convex part and a second concave part at one end close to the first part, the first convex part and the second concave part are matched with each other, the first concave part and the second convex part are matched with each other, or the wind shield is an integral structure which cannot be disassembled. The projection light machine further comprises:

19. The projection printer according to any one of claims 1 to 8, wherein, A second fan is located on a side of the first heat sink away from the display assembly; and A heat dissipation fin is arranged on a side of the second fan away from the first heat sink, a gap is formed between the heat dissipation fin and the second fan, and the heat dissipation fin and the second fan are connected and fixed by a rigid connecting piece. The projection light machine further comprises:

20. The projection printer according to any one of claims 1 to 8, wherein, A light cup is located on a light-incoming side of the display assembly, and comprises a cup body and a cup rim, the cup body is used for forming a light channel, the cup rim is connected with the cup body at an edge close to the display assembly, and is bent towards a side away from the light channel; and A first fan is located on a side of the light cup away from the light channel, and the minimum distance between the first fan and the cup rim is less than or equal to 2 mm.

21. A projection device, comprising: A light machine shell comprising a containing cavity, and an air inlet hole and an air outlet hole in communication with the containing cavity; and The projection light machine according to any one of claims 1 to 20 is arranged in the containing cavity. The gap between the air inlet hole and the projection light machine is a first gap, the gap between the air outlet hole and the projection light machine is a second gap, and the first gap and the second gap are different. ​ 22. The projection apparatus of claim 21, wherein, ​ 23. The projection apparatus of claim 22, wherein, The first gap is larger than the second gap.

24. The projection apparatus according to any one of claims 21 to 23, wherein, The optical engine housing further comprises a first housing surface and a second housing surface oppositely arranged along the first direction, a gap between the first housing surface and the projection optical engine is a third gap, a gap between the second housing surface and the projection optical engine is a fourth gap, the third gap is equal to the fourth gap, the third gap and the fourth gap are larger than the second gap and smaller than the first gap.

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