CN114624944B

CN114624944B - Projection apparatus

Info

Publication number: CN114624944B
Application number: CN202210197298.4A
Authority: CN
Inventors: 宋乐乐; 江浩
Original assignee: Formovie Chongqing Innovative Technology Co Ltd
Current assignee: Formovie Chongqing Innovative Technology Co Ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2024-05-07
Anticipated expiration: 2042-03-01
Also published as: CN114624944A

Abstract

The invention relates to projection equipment, which comprises a shell, a light machine, a lens assembly, a first sound and a second sound, wherein the light machine, the lens assembly, the first sound and the second sound are arranged in the shell, the lens assembly comprises a lens, a focusing ring and a driving device, the light-emitting side of the light machine is provided with a mounting hole, one end of the lens is arranged in the mounting hole, the focusing ring is sleeved on the lens, the first sound and the second sound are respectively arranged on two opposite sides of the lens, the driving device is detachably arranged on one side of the lens and between the first sound and the second sound, and the driving device is connected with the focusing ring and is used for driving the focusing ring and the lens to rotate so as to drive the lens to move forwards and backwards along the axial direction of the lens. Through setting up drive arrangement detachably in one side of camera lens and be located between first stereo set and the second stereo set, can make full use of the clearance between first stereo set and the second stereo set for compact structure, small, drive arrangement also conveniently dismantles moreover, can realize automatic focusing and manual focusing two modes's nimble selection.

Description

Projection apparatus

Technical Field

The present invention relates to the field of projection technologies, and in particular, to a projection apparatus.

Background

The lens of the projection device is mainly used for amplifying and projecting an image formed by an imaging device in the projection device onto a projection screen, when the distance between the screen and the imaging device is different, the relative position of the lens between the screen and the imaging device needs to be adjusted, so that a picture of the imaging device can be clearly imaged on the projection screen, and the process is called focusing of the lens.

Generally, focusing of a lens by a projection device adopts either a manual focusing mode or an electric focusing mode. The general LCD projection equipment has large lens volume, the shell is internally provided with devices such as a sound box, the space in the shell is limited, and if the electric focusing function is to be realized, the stacking difficulty of the devices is large, so that the miniaturization of the LCD projection equipment is not facilitated.

Disclosure of Invention

Based on this, it is necessary to provide a projection apparatus for the problem that the conventional projection apparatus is bulky for realizing the electric focusing function.

The utility model provides a projection equipment, includes the casing and sets up ray apparatus, lens subassembly, first stereo set and the second stereo set in the casing, the lens subassembly includes camera lens, focusing ring and drive arrangement, the mounting hole has been seted up to the light-emitting side of ray apparatus, the one end of camera lens install in the mounting hole, the focusing ring cover is located the camera lens, first stereo set and second stereo set are located respectively the relative both sides of camera lens, drive arrangement detachably set up in one side of camera lens and be located between first stereo set and the second stereo set, drive arrangement with the focusing ring is connected, is used for the drive focusing ring and camera lens rotate, in order to drive the camera lens is followed its axis direction and is moved back and forth.

In one embodiment, the lower parts of the first sound and the second sound extend downwards beyond the lower side of the lens to form an accommodating space, and the driving device is located below the lens and in the accommodating space.

In one embodiment, the light emitting side of the light machine is provided with a light emitting barrel protruding forwards, and the mounting hole is formed in the light emitting barrel; the first sound equipment and the second sound equipment face to one part of the side face of the light-emitting barrel to form an arc face, the first sound equipment and the second sound equipment are respectively arranged on two sides of the light-emitting barrel in a holding mode through the arc face, and the part, located below the arc face, of the first sound equipment and the second sound equipment is arranged on the lower side wall of the light-emitting barrel to form the accommodating space.

In one embodiment, the projection device further includes a first bracket and a heat dissipation component, the heat dissipation component is fixed on the optical machine and located below the light emitting barrel, the first bracket is mounted on the heat dissipation component, and the driving device is mounted on the first bracket and located between the light emitting barrel and the heat dissipation component.

In one embodiment, the heat dissipation assembly includes a heat conducting substrate, a heat conducting pipe and a radiator, one side surface of the heat conducting substrate is attached to the optical machine, one end of the heat conducting pipe is connected with the side surface of the heat conducting substrate away from the optical machine, the other end of the heat conducting pipe is connected with the radiator, the lower part of the first bracket is mounted on the side surface of the heat conducting substrate away from the optical machine, and the driving device is mounted on the upper part of the first bracket.

In one embodiment, the driving device comprises a driving motor and a gear arranged at the output end of the driving motor, and the outer wall of the focusing wheel is provided with matching teeth meshed with the gear; the inner wall of focusing ring is equipped with the edge the guiding gutter that the axis direction of camera lens extended and set up, the outer wall of camera lens is equipped with spacing post, the focusing ring cover is located the camera lens outside just spacing post is located in the guiding gutter, the gear drives when the focusing wheel rotates, spacing post can be followed the guiding gutter removes.

In one embodiment, the lens is in threaded connection with the inner wall of the mounting hole; or the lens assembly further comprises a fixing ring, wherein the fixing ring is fixed in the mounting hole and is in threaded connection with the lens.

In one embodiment, the projection device further includes a second bracket and a sensor switch mounted on the second bracket, the second bracket is fixed on the optical machine and located above the lens, the sensor switch is located at the periphery of the focusing wheel, a blocking piece extending along the circumferential direction of the focusing ring is arranged on the outer wall of the focusing ring, the blocking piece has a first end and a second end capable of triggering the sensor switch, the blocking piece can correspond to the sensor switch when the focusing ring rotates, and the sensor switch is electrically connected with the driving device.

In one embodiment, a window corresponding to the lens is formed in the housing, a first limiting portion is arranged on the inner side of the housing, the first limiting portion surrounds the window, a second limiting portion is arranged at one end of the light emitting tube, which faces the window, of the light emitting tube, one side of the focusing ring is abutted to the first limiting portion, and the other side of the focusing ring is abutted to the second limiting portion so as to limit the focusing ring to move back and forth along the axial direction of the lens.

In one embodiment, the projection device further includes a front cover decoration, the front cover decoration is provided with a light hole corresponding to the window, the front cover decoration is mounted on the outer side of the housing, and the first limiting part is arranged on the inner side of the front cover decoration and is abutted to the focusing ring through the window;

and/or the first limiting part comprises an annular bulge, an annular groove is formed in one side of the focusing ring, which faces the first limiting part, and the annular bulge is inserted into the annular groove.

Above-mentioned projection equipment, through setting up drive arrangement detachably in one side of camera lens and be located between first stereo set and the second stereo set, through drive arrangement drive focusing ring rotation, and then drive the camera lens rotation of establishing with the focusing ring cover to make the camera lens follow its axis direction and reciprocate and realize automatic focusing, make full use of clearance between first stereo set and the second stereo set, compact structure, small, drive arrangement also conveniently dismantles, can realize automatic focusing and manual focusing both modes's nimble selection, satisfies different customer's demand.

Drawings

FIG. 1 is an exploded view of a projection device according to an embodiment of the present application;

FIG. 2 is a schematic diagram illustrating a first view angle of a projection apparatus according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a projection apparatus according to an embodiment of the present application at a second view angle (with the first sound removed);

FIG. 4 is a schematic view of a projection apparatus according to an embodiment of the present application at a third viewing angle (with the first sound removed);

FIG. 5 is a schematic view of a projection apparatus according to an embodiment of the present application at a fourth viewing angle (with the first sound removed);

FIG. 6 is a schematic cross-sectional view of a projection apparatus according to an embodiment of the present application;

Fig. 7 is an enlarged partial schematic view of fig. 6.

FIG. 8 is a schematic view of a second bracket of a projection apparatus according to an embodiment of the present application;

fig. 9 is a schematic view of a front cover trim of a projection apparatus according to an embodiment of the present application.

Reference numerals illustrate:

10. A housing; 110. a front shell; 101. a window; 120. a rear case; 122. a first sound outlet hole; 124. a second sound outlet hole; 126. focusing holes; 130. a front cover trim; 103. a light hole; 132. a first limit part; 134. inserting a ring; 20. a light machine; 201. a mounting hole; 210. a light emitting barrel; 212. a second limit part; 31. a lens; 310. a limit column; 32. a fixing ring; 40. a focusing ring; 410. a guide groove; 420. a baffle; 421. a first end; 422. a second end; 430. mating teeth; 440. a slot; 50. a driving device; 510. a drive motor; 520. a gear; 61. a first sound box; 62. a second sound box; 601. an arc surface; 602. an upper fixing part; 603. a lower fixing part; 71. a second bracket; 710. a first mounting portion; 711. a connection part; 712. a second mounting portion; 72. an inductive switch; 80. a first bracket; 90. a heat dissipation assembly; 91. a thermally conductive substrate; 92. a heat conduction pipe; 93. a heat sink.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "first", "second", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "first," "second," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1, an embodiment of the present application provides a projection apparatus, which includes a housing 10, and an optical engine 20, a lens 31 assembly, a first sound box 61 and a second sound box 62 disposed in the housing 10. The lens 31 assembly includes a lens 31, a focusing ring 40 and a driving device 50. Referring to fig. 2 and 3, the light-emitting side of the optical engine 20 is provided with a mounting hole 201, one end of the lens 31 is mounted in the mounting hole 201, and the focusing ring 40 is sleeved on the lens 31. The lens 31 and the focusing ring 40 can synchronously rotate relative to the optical machine 20, and meanwhile, the lens 31 can move along the axial direction.

Further, the first sound 61 and the second sound 62 are respectively disposed on two opposite sides of the lens 31. The driving device 50 is detachably disposed on one side of the lens 31 and located between the first sound 61 and the second sound 62. The driving device 50 is connected to the focusing ring 40, and is used for driving the focusing ring 40 and the lens 31 to rotate so as to drive the lens 31 to move back and forth along the axial direction thereof.

Specifically, the projection device is a single-chip LCD projection device, and since the LCD is used as the light modulator, the LCD area is larger than that of other types of modulators (DMD, etc.), so that a larger lens 31 is required to be used. Wherein, the light machine 20 is internally provided with a light source, an LCD and other imaging devices, and an image formed by the imaging devices is amplified and projected to a projection screen through the lens 31, when a projection picture is unclear, the driving device 50 can drive the focusing ring 40 to drive the lens 31 to move back and forth along the axial direction until the projection picture is clear.

The projection device of this embodiment, through setting up drive arrangement 50 detachably in one side of camera lens 31 and drive arrangement 50 is located between first stereo set 61 and the second stereo set 62, drive focusing ring 40 through drive arrangement 50 and rotate, and then drive the camera lens 31 that establishes with focusing ring 40 cover and rotate, so that camera lens 31 moves back and forth along its axis direction and realizes automatic focusing, make full use of the clearance between first stereo set 61 and the second stereo set 62, make compact structure, small, drive arrangement 50 also conveniently dismantles moreover, can realize automatic focusing and manual focusing two mode nimble selection, satisfy different customer's demands.

Referring to fig. 2, further, the driving device 50 is located below the lens 31, the lower parts of the first sound 61 and the second sound 62 extend downward beyond the lower side of the lens 31 to form a receiving space, and the driving device 50 is located in the receiving space. The driving device 50 is located in the accommodating space, and does not affect the use of other parts in the housing 10. Because the lower parts of the first sound box 61 and the second sound box 62 extend downwards beyond the lower side of the lens 31, the first sound box 61 and the second sound box 62 are ensured to have enough large volumes, so that the first sound box 61 and the second sound box 62 can have better sound effects, and the driving device 50, the first sound box 61 and the second sound box 62 fully utilize the space below the lens 31, so that the structure is compact, and the volume of projection equipment is reduced. In other embodiments, the upper parts of the first sound 61 and the second sound 62 may be located above the lens 31 and in the accommodating space formed above the lens 31, so that the accommodating space is formed above the lens 31.

Referring to fig. 1-5, in one embodiment, the light-emitting side of the light engine 20 is provided with a light-emitting barrel 210 protruding forward, and the mounting hole 201 is opened in the light-emitting barrel 210. I.e. the light-emitting barrel 210 is suspended relative to the front side of the optical machine 20. An arc surface 601 is formed on a portion of the side surfaces of the first sound box 61 and the second sound box 62 facing the light emitting tube 210, and the first sound box 61 and the second sound box 62 are respectively embraced on two sides of the light emitting tube 210 through the arc surface 601. The portion of the first sound box 61 and the second sound box 62 located below the arc-shaped surface 601 and the lower side of the light emitting tube 210 form the accommodating space. By arranging a part of the side surfaces of the first sound box 61 and the second sound box 62 as an arc-shaped surface 601 matched with the outer surface of the light emitting tube 210, the first sound box 61 and the second sound box 62 are tightly attached to the light emitting tube 210, the whole structure is more compact, and the space occupied by the first sound box 61 and the second sound box 62 in the shell 10 is reduced. The first sound box 61 and the second sound box 62 each have an upper fixing portion 602 located above the arcuate surface 601 and a lower fixing portion 603 located below the arcuate surface 601, and the first sound box 61 and the second sound box 62 are connected to the optical machine 20 by the upper fixing portion 602 and the lower fixing portion 603. The two lower fixing portions 603 are formed with a gap below the light-emitting tube 210; the driving device 50 is located below the light-emitting barrel 210.

In one embodiment, referring to fig. 1-5 in particular, in one embodiment, the projection apparatus further includes a heat dissipation assembly 90, the heat dissipation assembly 90 is fixed to the optical engine 20, and the heat dissipation assembly 90 is disposed below the lens 31, and is disposed below the light output barrel 210 in particular. The heat dissipation assembly 90 is used for dissipating heat generated by the optical engine 20, especially heat generated by a light source in the optical engine 20. Further, the projection device further includes a first bracket 80, and the first bracket 80 is mounted to the heat dissipation assembly 90. The driving device 50 is mounted on the first bracket 80 and located between the light-emitting barrel 210 and the heat dissipation assembly 90. The radiating component 90 of the projection equipment can be utilized to fix the first bracket 80, and the first bracket 80 is locked on the radiating component 90 by screws penetrating through the hole sites on the first bracket 80 and the hole sites of the radiating component 90, so that the radiating component is convenient to assemble and disassemble and can be flexibly configured according to requirements.

Referring to fig. 1 and 4, in particular, in one embodiment, the heat dissipating assembly 90 includes a heat conducting substrate 91, a heat conducting tube 92, and a heat sink 93. One side surface of the heat conducting substrate 91 is attached to the optical engine 20, one end of the heat conducting tube 92 is connected with the side surface of the heat conducting substrate 91 away from the optical engine 20, and the other end of the heat conducting tube 92 is connected with the heat radiator 93. The lower portion of the first bracket 80 is mounted on the side of the heat conducting substrate 91 away from the optical engine 20, and the driving device 50 is mounted on the upper portion of the first bracket 80. The heat generated by the optical engine 20 is transferred to the heat conductive pipe 92 through the heat conductive substrate 91, and then transferred to the heat sink 93 through the heat conductive pipe 92 for discharging. The lower part of the first bracket 80 is provided with a yielding groove corresponding to the heat conducting pipe 92, the first bracket 80 avoids the heat conducting pipe 92 when being mounted on the heat conducting substrate 91, the heat transfer of the heat conducting pipe 92 is not affected, the upper part of the first bracket 80 is used for mounting the driving device 50, the upper part of the first bracket 80 is provided with a U-shaped mounting groove, the driving device 50 is mounted in the mounting groove, and the driving device 50 can be fixed on the upper part of the first bracket 80 through screws. The driving device 50 is vertically offset from the heat conductive substrate 91 by the first bracket 80, and heat is prevented from being transferred to the driving device 50.

Further, the lower end of the radiator 93 extends downward beyond the bottom side of the optical engine 20, the bottom side of the optical engine 20 is provided with a fan, and the air outlet of the fan faces the radiator 93, so that the air flow generated by the fan passes through the radiator 93 to rapidly carry away the heat on the radiator 93. Alternatively, the lower end of the radiator 93 is aligned with the lower end of the fan, so that the air flow generated by the fan passes through the radiator 93 entirely to improve the heat dissipation efficiency.

In one embodiment, the driving device 50 includes a driving motor 510 and a gear 520 disposed at an output end of the driving motor 510; the outer wall of the focusing wheel is provided with mating teeth 430 which mesh with the gear 520. The driving motor 510 is mounted to the first bracket 80. The driving motor 510 and the gear 520 are fixed between the first sound box 61 and the second sound box 62 by the first bracket 80, and stability and reliability are ensured. The driving motor 510 drives the gear 520 to rotate, and drives the mating teeth 430 meshed with the gear 520 to synchronously rotate, so as to drive the lens 31 connected with the focusing ring 40 to rotate.

Further, a guiding groove 410 extending along the axial direction of the lens 31 is provided on the inner wall of the focusing ring 40, a limiting post 310 is provided on the outer wall of the lens 31, the focusing ring 40 is sleeved on the outer side of the lens 31 and the limiting post 310 is provided in the guiding groove 410, and the limiting post 310 can move along the guiding groove 410 when the gear 520 drives the focusing wheel to rotate. Further, referring to fig. 1, the projection apparatus in this embodiment further includes a fixing ring 32, where the fixing ring 32 is fixed in the mounting hole 201 and the fixing ring 32 is screwed with the lens 31. The lens 31 and the focusing ring 40 are movably connected with the limit post 310 through the guide groove 410, and the focusing ring 40 drives the lens 31 to rotate around the axial direction of the focusing ring 40 when rotating, and the guide groove 410 extends along the axial direction of the lens 31 and is matched with the fixing ring 32 in a threaded manner, so that the threads on the fixing ring 32 push the lens 31 to move along the guide groove 410 in the rotating process of the lens 31, and then the lens 31 moves back and forth along the axial direction of the focusing ring 40. The lens 31 is in threaded fit with the fixing ring 32, so that the lens 31 is mounted in the mounting hole 201 of the optical machine 20 on one hand, and the lens 31 can be telescopic in the mounting hole 201 in the rotating process on the other hand.

Alternatively, referring to fig. 5, the inner wall of the focusing ring 40 is provided with a plurality of guide grooves 410, and the plurality of guide grooves 410 are uniformly spaced around the circumferential direction of the focusing ring 40. Because of the difference of the lenses 31, the initial focusing limiting positions of the lenses 31 of different manufacturers are different, when the lenses 31 are at a focusing limiting position, the positions of the limiting posts 310 of the lenses are possibly different, the setting positions of the inductive switches 72 are relatively fixed, a circle of guide grooves 410 are uniformly distributed on the inner wall of the focusing ring 40, when the limiting posts 310 of the lenses 31 are arranged at different positions of the outer wall of the focusing ring, the focusing ring 40 can be assembled with the lenses 31 at a position with relatively small tolerance, the rechecking requirement of the focusing range of the lenses 31 is ensured, and the lenses 31 of different manufacturers are compatible, so that the product quantization production is realized.

Alternatively, in other embodiments, the lens 31 may be directly screwed to the inner wall of the mounting hole 201 without the fixing ring 32, and the lens 31 is pushed to move back and forth by the threads in the mounting hole 201.

Alternatively, in other embodiments, the lens 31 and the focusing ring 40 may be fixedly connected, the lens 31 is screwed to the mounting hole 201 or the fixing ring 32, and when the driving device 50 drives the focusing ring 40 to rotate, the lens 31 and the focusing ring 40 synchronously rotate and move back and forth together.

In one embodiment, the projection apparatus further includes a second bracket 71 and a sensor switch 72 mounted on the second bracket 71, wherein the second bracket 71 is fixed on the optical bench 20 and located above the lens 31. The second bracket 71 does not interfere with the first bracket 80. The inductive switch 72 is located at the outer periphery of the focusing wheel, and a blocking piece 420 extending along the circumferential direction of the outer wall of the focusing ring 40 is provided on the outer wall. The blocking piece 420 has a first end 421 and a second end 422 capable of triggering the inductive switch 72, the blocking piece 420 can correspond to the inductive switch 72 when the focusing ring 40 rotates, and the inductive switch 72 is electrically connected with the driving device 50.

The sensor switch 72 senses whether the shutter is in its signal position and is used to determine whether the focus ring 40 is in the limit position. Referring to fig. 4, when the first end 421 of the baffle triggers the signal of the sensor switch 72, the sensor switch 72 changes, the system controls the driving device 50 to rotate reversely, when the focusing ring 40 rotates to a certain position according to the direction indicated by the arrow in fig. 4, the second end 422 of the baffle moves to the position of the sensor switch 72, the sensor switch 72 gives a signal, and the system controls the driving device 50 to rotate reversely again, so as to ensure that the lens 31 can move in a required stroke when the focusing ring 40 drives the lens 31 to focus. Alternatively, the inductive switch 72 is a light-sensitive switch. In other embodiments, the inductive switch 72 may employ other devices, such as a hall switch, a proximity switch, and the like.

Alternatively, referring to fig. 1 and 8, in one embodiment, the second bracket 71 includes a first mounting portion 710, a connecting portion 711, and a second mounting portion 712 that are sequentially connected in a "C" shape. The two inductive switches 72 are respectively mounted on the first mounting portion 710 and the second mounting portion 712, and the connecting portion 711 is connected to the top of the optical bench 20. The first mounting portion 710 and the second mounting portion 712 are respectively provided with a switch PCB electrically connected to the inductive switch 72, and the switch PCB is electrically connected to the driving device 50. After the inductive switch 72 is triggered, a signal is transmitted to the switch PCB board, and the steering of the driving device 50 is adjusted. The rotation position of the focusing ring 40 is monitored by the two inductive switches 72, so that the logic is simple and the reliability is high. In other embodiments, only one sensing switch 72 may be provided, so that the rotation position of the focusing ring 40 may be monitored, and the structure is simple and the cost is reduced.

Referring to fig. 1, 6, 7, and 9, in one embodiment, a window 101 corresponding to the lens 31 is formed on the housing 10, a first limiting portion 132 is disposed on the inner side of the housing 10, and the first limiting portion 132 is disposed around the window 101. One end of the light emitting tube 210 facing the window 101 has a second limiting portion 212. One side of the focusing ring 40 abuts against the first limiting portion 132, and the other side of the focusing ring 40 abuts against the second limiting portion 212, so as to limit the focusing ring 40 from moving back and forth along the axial direction of the lens 31. The focusing ring 40 is limited by the first limiting part 132 and the second limiting part 212, so that the focusing ring 40 can only coaxially rotate with the lens 31 and cannot move back and forth along the axial direction of the focusing ring, and the stability of the back and forth movement of the lens 31 and the focusing reliability are ensured. Specifically, referring to fig. 1, the housing 10 includes a front shell 110 and a rear shell 120 that are detachably connected, and the front shell 110 and the rear shell 120 are clamped by a fastening structure, so as to enclose an inner cavity for accommodating each part. The window 101 is opened on the front case 110.

Further, referring to fig. 6, 7 and 9, in one embodiment, the projection apparatus further includes a front cover decoration 130, and the front cover decoration 130 is provided with a light hole 103 corresponding to the window 101. The front cover decoration 130 is mounted on the outer side of the housing 10, and the first limiting portion 132 is disposed on the inner side of the front cover decoration 130 and abuts against the focusing ring 40 through the window 101. The focusing ring 40 is abutted against the first limiting portion 132 of the front cover decoration 130, and the light emitted from the lens 31 is projected to the projection screen through the window 101 and the light hole 103. By arranging the front cover decoration 130, on one hand, the aesthetic property of the projection device is improved, and on the other hand, the first limiting part 132 is arranged on the inner side of the front cover decoration 130, so that the first limiting part 132 is convenient to be in butt fit with the focusing ring 40.

Further, the first limiting portion 132 includes an annular protrusion, and an annular groove is disposed on a side of the focusing ring 40 facing the first limiting portion 132, and the annular protrusion is inserted into the annular groove. The focusing ring 40 is matched with the annular groove through the annular bulge, so that the focusing ring 40 rotates around the annular bulge, the stability of the focusing ring 40 is ensured, and the focusing reliability is improved.

Alternatively, referring to fig. 3, 5 and 6, in one embodiment, a portion of the side surface of the light output tube 210 of the light engine 20 below the light output tube 210 is an inclined surface facing upward, i.e. a portion of the front side surface of the light engine 20 is an inclined surface. The light emitting tube 210, the first sound 61, the second sound 62, and the inclined surface are surrounded to form the accommodating space, and the driving device 50 is positioned in the accommodating space, so that the use of other parts in the housing 10 is not affected. The heat conductive substrate 91 is provided on the inclined surface.

Optionally, a focusing hole 126 corresponding to the focusing ring 40 is formed on the top of the rear housing 120. According to requirements, a thumb wheel matched with the focusing ring 40 can be arranged in the focusing hole 126 to realize manual focusing. The automatic focusing and manual focusing modes of the projection equipment are not interfered, and the focusing requirements of different customers are met.

In one embodiment, a first sound outlet 122 corresponding to the first sound 61 is formed on one side of the rear housing 120, and a second sound outlet 124 corresponding to the second sound 62 is formed on the other side of the rear housing 120. Specifically, the first sound box 61 and the second sound box 62 are respectively disposed on the left and right sides of the lens 31, and the first sound outlet 122 and the second sound outlet 124 are respectively disposed on the left and right sides of the rear case 120. Further, the front housing 110 is further provided with a heat dissipation hole corresponding to the heat dissipation assembly 90, so as to drain the heat generated by the optical engine 20 out of the housing 10.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The projection equipment is characterized by comprising a shell, a light machine, a lens assembly, a first sound and a second sound, wherein the light machine, the lens assembly, the first sound and the second sound are arranged in the shell, the lens assembly comprises a lens, a focusing ring and a driving device, a mounting hole is formed in the light emergent side of the light machine, one end of the lens is mounted in the mounting hole, the focusing ring is sleeved on the lens, the first sound and the second sound are respectively arranged on two opposite sides of the lens, the driving device is detachably arranged on one side of the lens and between the first sound and the second sound, and the driving device is connected with the focusing ring and used for driving the focusing ring and the lens to rotate so as to drive the lens to move forwards and backwards along the axial direction of the lens;

The projection device comprises a light-emitting device, a projection device and a heat radiation assembly, wherein the light-emitting side of the light-emitting device is provided with a light-emitting cylinder protruding forwards, and the projection device further comprises a first bracket and the heat radiation assembly; the driving device is arranged on the first bracket and is positioned between the light emitting cylinder and the heat dissipation component;

The heat dissipation assembly comprises a heat conduction substrate, a heat conduction pipe and a radiator, wherein one side surface of the heat conduction substrate is attached to the optical machine, one end of the heat conduction pipe is connected with the side surface of the heat conduction substrate, which is far away from the optical machine, the other end of the heat conduction pipe is connected with the radiator, the lower part of the first support is installed on the side surface of the heat conduction substrate, which is far away from the optical machine, and the driving device is installed on the upper part of the first support.

2. The projection device of claim 1, wherein the lower portions of the first and second speakers extend downward beyond the underside of the lens to form a receiving space, and the driving means is located below the lens and within the receiving space.

3. The projection device of claim 2, wherein the mounting hole is formed in the light-emitting barrel; the first sound equipment and the second sound equipment face to one part of the side face of the light-emitting barrel to form an arc face, the first sound equipment and the second sound equipment are respectively arranged on two sides of the light-emitting barrel in a holding mode through the arc face, and the part, located below the arc face, of the first sound equipment and the second sound equipment is arranged on the lower side wall of the light-emitting barrel to form the accommodating space.

4. The projection apparatus according to claim 1, wherein a lower portion of the first bracket is provided with a relief groove corresponding to the heat conduction pipe, and the first bracket is disposed so as to avoid the heat conduction pipe when mounted on the heat conduction substrate.

5. The projection device of claim 3 or 4, wherein the driving means comprises a driving motor and a gear provided at an output end of the driving motor, and the outer wall of the focusing ring is provided with mating teeth meshed with the gear; the inner wall of focusing ring is equipped with the edge the guiding gutter that the axis direction of camera lens extended and set up, the outer wall of camera lens is equipped with spacing post, the focusing ring cover is located the camera lens outside just spacing post is located in the guiding gutter, the gear drives when the focusing ring rotates, spacing post can be followed the guiding gutter removes.

6. The projection device of claim 5, wherein the lens is threadably coupled to an inner wall of the mounting hole; or the lens assembly further comprises a fixing ring, wherein the fixing ring is fixed in the mounting hole and is in threaded connection with the lens.

7. The projection device of claim 5, further comprising a second bracket and a sensor switch mounted on the second bracket, wherein the second bracket is fixed on the optical machine and is located above the lens, the sensor switch is located at the periphery of the focusing ring, a blocking piece extending along the circumferential direction of the outer wall of the focusing ring is provided with a first end and a second end capable of triggering the sensor switch, and the blocking piece can correspond to the sensor switch when the focusing ring rotates, and the sensor switch is electrically connected with the driving device.

8. The projection device of claim 5, wherein a window corresponding to the lens is formed in the housing, a first limiting portion is disposed on the inner side of the housing, the first limiting portion is disposed around the window, a second limiting portion is disposed at one end of the light emitting tube, which faces the window, of the light emitting tube, one side of the focusing ring is abutted to the first limiting portion, and the other side of the focusing ring is abutted to the second limiting portion, so that the focusing ring is limited to move back and forth along the axial direction of the lens.

9. The projection apparatus according to claim 8, further comprising a front cover trim piece provided with a light hole corresponding to the window, the front cover trim piece being mounted on an outer side of the housing, the first limiting portion being provided on an inner side of the front cover trim piece and abutting the focus ring through the window.

10. The projection device of claim 8, wherein the first limiting portion includes an annular protrusion, and an annular groove is disposed on a side of the focusing ring facing the first limiting portion, and the annular protrusion is inserted into the annular groove.