CN109669310B

CN109669310B - Optical machine and projection equipment

Info

Publication number: CN109669310B
Application number: CN201811617083.3A
Authority: CN
Inventors: 田文凯
Original assignee: Shenzhen Zijing Photoelectric Technology Co ltd
Current assignee: Shenzhen Zijing Photoelectric Technology Co.,Ltd.
Priority date: 2018-12-27
Filing date: 2018-12-27
Publication date: 2021-04-23
Anticipated expiration: 2038-12-27
Also published as: CN109669310A

Abstract

The invention discloses an optical machine and projection equipment, wherein the optical machine comprises a shell, a Fresnel mirror and a driving assembly, wherein a cavity is formed in the shell; the Fresnel mirror is rotatably connected to the inner wall of the cavity; the driving assembly comprises a first magnetic body and a second magnetic body, the first magnetic body is mounted on the Fresnel mirror and abutted against the inner wall of the cavity, the second magnetic body is abutted against the outer wall surface of the shell and magnetically connected with the first magnetic body to move the second magnetic body to isolate and drive the first magnetic body to move so as to drive the Fresnel mirror to move. The light machine of the technical scheme of the invention has good dustproof effect and can avoid light leakage.

Description

Optical machine and projection equipment

Technical Field

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

Background

The optical machine is a core display module of the projector and is used for generating images and projecting pictures on a display screen through an optical imaging system of the optical machine. The projector is usually unbalanced when being placed or fixed, thereby causing the projection picture of the optical machine to present a T-shaped distortion phenomenon. At present, an optical machine for correcting T-shaped distortion by utilizing optics is generally characterized in that an opening is formed in a shell, a connecting rod is arranged on the shell and penetrates through the opening to be connected onto a Fresnel lens, the other end of the connecting rod is connected with a handle, the handle is arranged outside the shell, and the Fresnel lens is driven to move when the handle is moved, so that the purpose of correcting distortion is achieved. However, this method requires an opening on the housing, which causes light leakage of the light machine and light spots on the screen to affect viewing; and dust or foreign matters can enter the optical machine through the opening and attach to the optical assembly, and spots are generated on a projection picture through the amplification of the optical system.

Disclosure of Invention

The invention mainly aims to provide an optical machine, and aims to obtain an optical machine which is dustproof and reduces light leakage.

In order to achieve the above object, the present invention provides an optical machine, including:

a housing formed with a cavity;

the Fresnel mirror is rotatably connected to the inner wall of the cavity;

the driving assembly comprises a first magnetic body and a second magnetic body, the first magnetic body is installed on the Fresnel mirror and abutted against the inner wall of the cavity, the second magnetic body is abutted against the outer wall surface of the shell and magnetically connected with the first magnetic body to move the second magnetic body to isolate and drive the first magnetic body to move so as to drive the Fresnel mirror to move.

Optionally, the middle parts of the two sides of the Fresnel mirror are rotatably connected with the inner side wall of the shell, the second magnetic body is installed at one end of the Fresnel mirror, and the first magnetic body is isolated and drives the second magnetic body to move along an arc track so as to drive the Fresnel mirror to swing.

Optionally, the top wall of casing to the cavity is inside to be equipped with the holding tank in the concave way, the second magnetic substance subsides are located the inside wall of holding tank, first magnetic substance corresponds to paste and locates the outer wall of holding tank.

Optionally, the protruding baffle that is equipped with of interior roof of cavity, the baffle with the lateral wall interval of holding tank sets up, the second magnetic substance subsides are located the inside wall of holding tank, first magnetic substance butt the baffle deviates from the surface of second magnetic substance.

Optionally, the drive assembly further comprises a handle, one end of the handle is connected with the second magnetic body, the other end of the handle is lapped on the outer edge of the notch of the accommodating groove, and the handle is pulled to drive the second magnetic body to move.

Optionally, the optical machine further includes a lens disposed on one side of the fresnel mirror, the housing is provided with a mounting hole for mounting the lens, and the mounting hole is communicated with the cavity;

the driving assembly further comprises a crank, the crank is mounted on the shell and can swing by taking the center of the lens as a circle center, one end of the crank is connected with the second magnetic body, and the crank is rotated to drive the second magnetic body to move in an isolation mode so as to drive the first magnetic body to move.

Optionally, the protruding mounting bracket that is equipped with of cavity roof, the mounting bracket has seted up the mounting hole, the mounting bracket seted up with the same slide of mounting hole interval and radian, the crank install in the slide and for the slide slides, the operation mouth has been seted up to the mounting bracket, the crank expose in the operation mouth.

Optionally, the mounting bracket includes that the cooperation forms first mounting bracket and the second mounting bracket of slide, the half slot is seted up to first mounting bracket, the second mounting bracket half hold in the half slot, the center of second mounting bracket is seted up the mounting hole, the concave storage tank that is equipped with of internal face of half slot, and seted up the operation mouth, second magnetic substance butt in the internal face of storage tank, first magnetic substance butt the outer wall of storage tank.

Optionally, the driving assembly further includes a connecting rod, one end of the connecting rod is connected to one end of the fresnel mirror, and the other end of the connecting rod is connected to the first magnetic body.

The invention also provides projection equipment which comprises a box body and the optical machine arranged in the box body.

The technical scheme of the invention realizes the non-opening structure by adopting a magnetic connection mode. Specifically, the fresnel mirror rotates to be connected in the casing, a drive assembly for driving the fresnel mirror includes first magnetic substance and second magnetic substance, first magnetic substance is located in the casing and is connected with the fresnel mirror, the second magnetic substance is located outside the casing, utilize the magnetism of first magnetic substance and second magnetic substance to inhale the principle mutually, it can drive first magnetic substance to remove to be located the outside second magnetic substance of casing, thereby need not set up the opening and can drive the regulation to the fresnel mirror, and then adjust the projection distortion. The structure has the advantages that dust or sundries can be effectively prevented from entering the optical machine without opening or holes, the problem of light spots caused by light leakage is avoided, and the effect of projection is effectively improved while distortion is corrected.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a projection apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an optical engine of the projection apparatus shown in FIG. 1;

FIG. 3 is a schematic diagram of the light engine shown in FIG. 2 with the upper housing removed;

FIG. 4 is a schematic diagram of the optical engine shown in FIG. 2 with a lower housing removed;

FIG. 5 is a cross-sectional view of the light engine of FIG. 2;

FIG. 6 is an enlarged view taken at A in FIG. 5;

FIG. 7 is another cross-sectional view of the light engine of FIG. 2;

FIG. 8 is a schematic structural diagram of a projection apparatus according to another embodiment of the present invention;

FIG. 9 is an exploded view of the projection device shown in FIG. 8;

FIG. 10 is a cross-sectional view of the projection device shown in FIG. 8;

FIG. 11 is an enlarged view at B of FIG. 10;

FIG. 12 is a schematic structural diagram of a projection apparatus according to another embodiment of the present invention;

FIG. 13 is a schematic diagram of an optical engine of the projection apparatus shown in FIG. 12;

FIG. 14 is a schematic view of the projector of FIG. 12 with a lens removed;

FIG. 15 is a partial exploded view of the housing and drive assembly of the light engine shown in FIG. 13;

fig. 16 is a partial exploded view of the housing and the driving element of the light engine shown in fig. 13 from another perspective.

The reference numbers illustrate:

reference numerals

Name (R)

Reference numerals

Name (R)

Reference numerals

Name (R)

100

Optical machine

17

Accommodating tank

55

Handle (CN)

10

Shell body

18

Second mounting rack

551

Hand-held board

10a

Hollow cavity

181

Mounting hole

551a

Clamp hook

10b

Slide way

183

Clamping groove

553

Fastening plate

11

Upper shell

19

Baffle plate

57

Crank arm

13

Lower casing

30

Fresnel mirror

571

Magnet seat

15

Spectacle frame

40

Mounting seat

59

Connecting rod

151

Shaft hole

41

Clamping groove

70

Lens barrel

16

First mounting rack

43

Rotating shaft

200

Projection device

161

Semi-circular groove

50

Drive assembly

201

Box body

163

Operation port

51

A first magnetic body

201a

Mounting cavity

165

Containing groove

53

Second magnetic body

201b

Avoiding hole

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The present invention provides an optical engine 100.

Referring to fig. 2 to 6, in an embodiment of the invention, the optical engine 100 includes a housing 10, a fresnel mirror 30 and a driving element 50, the housing 10 forms a cavity 10a, and the housing 10 is generally made of plastic, is non-conductive and is convenient for injection molding. The housing 10 is a split structure, specifically, the housing 10 includes an upper housing 11 and a lower housing 13 connected up and down, the upper housing 11 and the lower housing 13 enclose a cavity 10a, and the connection mode of the upper housing 11 and the lower housing 13 may be a snap connection, a threaded connection, or other connection modes, which is not limited herein. The detachable connection facilitates mounting of the optical element in the housing 10, thereby implementing optical projection and facilitating maintenance of the optical engine 100. Of course, the housing 10 may be provided as a unitary structure. Generally, the housing 10 has a substantially rectangular parallelepiped shape, but the shape of the housing 10 may be designed to have a square structure, a polygonal structure, or other irregular shapes according to actual needs.

The method of driving the fresnel lens by isolating the two magnetic bodies through the inner wall and the outer wall of the housing 10 of the optical engine 100 is not limited to the installation positions of the two magnetic bodies and the structural characteristics of the optical engine 100. The fresnel mirror 30 is rotatably connected to the inner wall of the cavity 10a, the fresnel mirror 30 is substantially in the shape of a rectangular plate, and the fresnel mirror 30 can increase the display brightness of the projected image by focusing or adjusting the collimation of light in the optical machine 100. The fresnel mirror 30 is vertically erected in the housing 10 and rotatably connected to the inner wall surface of the cavity 10a, so that when the driving assembly 50 is used to adjust the fresnel mirror 30, the adjustment of the angle of the fresnel mirror 30 is changed conveniently, thereby improving the efficiency of correcting the T-shaped distortion.

The driving assembly 50 of the present embodiment includes a first magnetic body 51 and a second magnetic body 53, where magnetism refers to magnetic permeability, the first magnetic body 51 and the second magnetic body 53 may both be magnets, and the magnets may be permanent magnets or non-permanent magnets, of course, one of the first magnetic body 51 and the second magnetic body 53 is a magnet, and the other is a metal material with magnetic permeability, such as iron, nickel and cobalt, as long as mutual magnetic attraction is achieved. The first magnetic body 51 is mounted on the fresnel mirror 30 and abuts against the inner wall of the cavity 10a, and the connection between the first magnetic body 51 and the fresnel mirror 30 may be detachable, such as a snap connection or a screw connection, or may be fixed, such as an adhesive connection or other connections. Specifically, the mounting base 40 is fixedly mounted at the edge of the fresnel mirror 30, the mounting base 40 is provided with a clamping groove 41, and the outer diameter of the first magnetic body 51 is in interference fit with the inner diameter of the clamping groove 41, so that the first magnetic body 51 can be conveniently mounted. The first magnetic body 51 is a cylinder, and correspondingly, the fastening groove 41 formed in the mounting base 40 is also a circle, but of course, the shape of the first magnetic body 51 may be other shapes, and the shape of the fastening groove 41 is matched with the shape.

The second magnetic body 53 abuts against the outer wall surface of the housing 10 and is magnetically connected with the first magnetic body 51, and the second magnetic body 53 is moved to drive the first magnetic body 51 to move in an isolated manner, so as to drive the fresnel mirror 30 to move. The second magnetic body 53 is provided on the outer wall surface of the housing 10, and may be magnetically attracted to the first magnetic body 51 through the housing 10, and the second magnetic body 53 may be cylindrical so that the generated magnetic force is uniformly distributed corresponding to the first magnetic body 51, and the size of the second magnetic body 53 may be the same as that of the first magnetic body 51, so that the magnetic force action of the two is balanced, and the connection stability of the two is maintained. Of course, the size of the second magnetic body 53 may be larger than that of the first magnetic body 51. The second magnetic member 53 is unlikely to have an excessively large movement locus, and the magnetic attraction with the first magnetic member 51 is prevented from being lost.

The technical scheme of the invention realizes the non-opening structure by adopting a magnetic connection and isolation driving mode. Specifically, the fresnel mirror 30 is rotatably connected in the housing 10, a driving assembly 50 for driving the fresnel mirror 30 includes a first magnetic body 51 and a second magnetic body 53, the first magnetic body 51 is arranged in the housing 10 and connected with the fresnel mirror 30, the second magnetic body 53 is arranged outside the housing 10, by using the magnetic attraction principle of the first magnetic body 51 and the second magnetic body 53, the second magnetic body 53 positioned outside the housing 10 can be moved to drive the first magnetic body 51, so that the fresnel mirror 30 can be driven and adjusted without opening, and further projection distortion can be adjusted. In this structure do not opening or hole can effectively avoid dust or debris to get into in the ray apparatus 100, and avoid taking place the facula problem that the light leak condition leads to, effectively improve the projected effect when correcting the distortion.

Referring to fig. 7, optionally, the middle portions of the two sides of the fresnel mirror 30 are rotatably connected to the inner side wall of the housing 10, the second magnetic body 53 is installed at one end of the fresnel mirror 30, and the first magnetic body 51 drives the second magnetic body 53 to move along an arc track to drive the fresnel mirror 30 to swing.

On the basis of the above embodiment, the middle parts of the two sides of the fresnel mirror 30 are connected with the casing 10, so that the stability of fixing the fresnel mirror 30 is improved, and meanwhile, the second magnetic body 53 is installed at one end of the fresnel mirror 30, so that the force for driving the fresnel mirror 30 to move is light and handy, and the driving and adjusting are convenient. Specifically, the middle part of the mounting seat 40 of the both sides of the fresnel mirror 30 is convexly provided with a rotating shaft 43, the bottom wall of the lower shell 13 is convexly provided with two mirror frames 15 which are oppositely arranged, each mirror frame 15 is provided with a shaft hole 151, and the two rotating shafts 43 respectively penetrate into the two shaft holes 151, so that stable rotation is realized, and the rotating process is smooth.

Referring to fig. 6 again, in the driving assembly 50 of an embodiment based on the above embodiment, the top wall of the housing 10 is recessed into the cavity 10a to form an accommodating groove 17, the second magnetic body 53 is attached to the inner side wall of the accommodating groove 17, and the first magnetic body 51 is correspondingly attached to the outer wall of the accommodating groove 17.

In this embodiment, in order to make the driving assembly 50 more hidden and improve the overall appearance of the optical machine 100, the accommodating groove 17 is inwardly recessed from the top wall of the housing 10, and the outer wall surface of the accommodating groove 17 is the inner wall surface of the cavity 10a, so that the second magnetic body 53 can be hidden in the accommodating groove 17, the second magnetic body 53 is prevented from being accidentally touched, and the corrected fresnel mirror 30 is moved again. There is the lens 70 that is used for the projection in the ray apparatus 100, and this lens 70 is usually located the direction of height of cuboid, and when ray apparatus 100 normally placed promptly, lens 70 is located the side of ray apparatus 100, so sets up holding tank 17 at the roof of casing 10 to do not influence the projection performance of ray apparatus 100, and this structural position is comparatively hidden. The second magnetic body 53 and the first magnetic body 51 are magnetically attracted by the groove walls of the accommodating groove 17, and the magnitude of the magnetic force between the two is influenced by the thickness of the housing 10, so that the magnitude of the magnetic force is adjusted by changing the thickness of the housing 10. In addition, an arc-shaped track can be arranged between the second magnetic body 53 and the groove wall of the accommodating groove 17, so that the second magnetic body 53 can move conveniently when being adjusted, the stability of the magnetic force between the first magnetic body 51 and the second magnetic body 53 is ensured, and the efficiency of adjusting the angle change of the Fresnel mirror 30 is improved.

In order to enlarge and adjust the magnetic force range between the first magnetic body 51 and the second magnetic body 53, a baffle 19 is convexly arranged on the inner top wall of the cavity 10a, the baffle 19 and the side wall of the accommodating groove 17 are arranged at intervals, the second magnetic body 53 is attached to the inner side wall of the accommodating groove 17, and the first magnetic body 51 is abutted to the surface of the baffle 19 departing from the second magnetic body 53.

In this embodiment, baffle 19 has been add between the lateral wall of first magnetic substance 51 and holding tank 17 to make and be formed with the space between the lateral wall of baffle 19 and holding tank 17, this space can design according to actual need, thereby the magnetic force size between regulation and control first magnetic substance 51 and the second magnetic substance 53 guarantees the convenience and the stability of regulation. Meanwhile, the baffle 19 is arranged so that the material of the shell 10 can be selected without thickness limitation, thereby facilitating processing.

Referring to fig. 8 to 10, in a first embodiment of the present invention, the driving assembly 50 further includes a handle 55, wherein in the second embodiment, one end of the handle 55 is connected to the second magnetic body 53, and the other end of the handle 55 is overlapped on an outer edge of the notch of the receiving groove 17, and the handle 55 is pulled to drive the second magnetic body 53 to move.

In this embodiment, set up handle 55 and be convenient for the user to adjust, handle 55 one end is connected in second magnetic substance 53, and the other end protrusion is in the notch of holding tank 17, and the user need not stretch into in the holding tank 17 just can remove second magnetic substance 53 and adjust the operation. Handle 55 and second magnetic substance 53 be connected and can be the joint, for example, handle 55 includes handheld board 551 and two relative settings's of following handheld board 551 middle part vertical extension card 553, form the jack between two card 553, the size of this jack is identical with the outer fringe size of second magnetic substance 53, thereby insert handle 55 in holding tank 17, second magnetic substance 53 forms stable connection in inserting the jack, handheld board 551 butt holding tank 17's notch outward flange, handheld board 551 can take place rectilinear movement relative holding tank 17, and then make second magnetic substance 53 remove, this simple structure easily installs, convenience and the efficiency of regulation have been improved under the open-ended condition. Of course, the handle 55 may be integrally formed with the second magnetic body 53.

Referring to fig. 12 to fig. 16, in another sub-embodiment of the handle 55 based on the above embodiment, the optical engine 100 further includes a lens 70 disposed on one side of the fresnel mirror 30, the housing 10 is provided with a mounting hole 181 for mounting the lens 70, and the mounting hole 181 is communicated with the cavity 10 a;

the driving assembly 50 further includes a crank 57, the crank 57 is mounted on the housing 10 and can swing around the center of the lens 70, one end of the crank 57 is connected to the second magnetic body 53, and the crank 57 is rotated to drive the second magnetic body 53 to move in an isolated manner, so as to drive the first magnetic body 51 to move.

Generally, the optical engine 100 needs to be provided with a hole for the lens 70, and the lens 70 is detachably connected to the hole, so in this embodiment, the housing 10 is provided with a mounting hole 181 communicating with the cavity 10a, and the lens 70 is installed in the mounting hole 181 to receive the light transmitted by the fresnel mirror 30, thereby completing the projection. The lens 70 may be mounted by a screw connection or a snap connection, or may be inserted or mounted by other means, so as to facilitate replacement of the lens 70. Specifically, the inner wall of the mounting hole 181 is provided with an internal thread, and correspondingly, the circumferential surface of the lens 70 is provided with an external thread, so that the lens 70 is quickly mounted on the housing 10 through the connection between the internal thread and the external thread. The crank 57 is used for driving and connected with the second magnetic body 53, the crank 57 is installed on the housing 10 in an arc shape and can swing around the center of the lens 70, so as to drive the second magnetic body 53 to swing and drive the first magnetic body 51 to move, thereby correcting the distortion. The driving assembly 50 in this structure utilizes the position and structure setting of the lens 70 to further reduce the setting of the slot hole, improve the dustproof effect of the optical machine 100 and prevent the light leakage, and then improve the projection effect. Meanwhile, the crank 57 swings around the center of the lens 70, thereby achieving the accuracy of adjustment. In addition, in order to improve convenience of holding, an outer wall surface of the crank 57 is provided as a rough surface, and particularly, a plurality of protrusions may be provided side by side, thereby increasing friction with a hand, reducing effort of a user, and improving convenience.

Specifically, the protruding mounting bracket that is equipped with of cavity 10a roof, the mounting bracket has seted up mounting hole 181, the mounting bracket seted up with mounting hole 181 interval and the same slide 10b of radian, crank 57 install in slide 10b and for slide 10b slides, the internal wall face of slide 10b is concave establishes storage tank 165, second magnetic substance 53 butt storage tank 165's internal wall face, first magnetic substance 51 butt storage tank 165's outer wall face.

In this embodiment, the mounting bracket includes a first mounting bracket 16 and a second mounting bracket 18, and the first mounting bracket 16 is connected to the second mounting bracket 18 by a screw thread. This first mounting bracket 16 is set up by the protruding top wall of cavity 10a and forms, and the middle part of second mounting bracket 18 is mounting hole 181, and first mounting bracket 16 is formed with half slot 161, and second mounting bracket 18 is the ring form, and second mounting bracket 18 is half to be held in half slot 161 to form slide 10b with the cooperation of first mounting bracket 16, in order to hold crank 57. Specifically, the outer wall surface of the second mounting bracket 18 and the inner wall surface of the first mounting bracket 16 are provided with clamping grooves 183, and the two clamping grooves 183 are butted to form a slide 10b so as to limit the crank 57, so that the crank 57 can swing more smoothly. One end of the crank 57 is provided with a magnet holder 571, the magnet holder 571 is provided with a circular hole, and the second magnetic body 53 is installed in the circular hole. The inner wall surface of the slot 183 forming the slide 10b is recessed with a receiving slot 165, the magnet holder 571 is received in the receiving slot 165, the second magnetic body 53 abuts against the inner side wall of the receiving slot 165, the first magnetic body 51 abuts against the outer side wall of the receiving slot 165, when the crank 57 slides along the outer periphery of the lens 70 holder, the second magnetic body 53 slides in the receiving slot 165, the first magnetic body 51 is driven to move, the fresnel mirror 30 is driven to swing, and the T-shaped distortion of the optical machine 100 is adjusted. Can improve gliding smooth and easy nature and the stability of crank 57 in this structure to can realize the accurate swing of second magnetic substance 53, it is unanimous with fresnel mirror 30's swing, improve the accuracy of adjusting, further improve the degree of accuracy of correcting, realize better projection effect.

In addition, an operation opening 163 is opened in the middle of the semicircular groove 161 of the first mounting frame 16, and the crank 57 is exposed to the operation opening 163.

In this embodiment, in order to enable the crank 57 to be adjusted outside the housing 10, the side wall of the semicircular groove 161 is provided with an operation opening 163, the operation opening 163 faces the lower side of the optical engine 100 and is not communicated with the mounting hole 181, and the crank 57 is exposed from the operation opening 163, so that dust or impurities cannot enter the housing 10 through the operation opening 163, and the dustproof performance of the optical engine 100 is effectively improved.

Optionally, the center line of the lens 70 is parallel to the surface of the fresnel mirror 30, i.e. the lens of the lens 70 is perpendicular to the surface of the fresnel mirror 30. The driving assembly 50 further includes a connecting rod 59, one end of the connecting rod 59 is connected to one end of the fresnel mirror 30, and the other end is connected to the first magnetic body 51.

In this embodiment, because lens 70 is located one side of fresnel mirror 30, and have certain distance with fresnel mirror 30, and the lens of lens 70 and fresnel mirror 30's surface are perpendicular setting, so set up a connecting rod 59, the one end of connecting rod 59 and fresnel mirror 30's be connected, the other end buckle closure is in first magnetic substance 51, thereby realize the swing that second magnetic substance 53 drove first magnetic substance 51 through the slip of crank 57, and then make connecting rod 59 drive fresnel mirror 30 swing, can set up the length of connecting rod 59 according to actual demand, thereby adjust the transmission of light, reach better projection effect.

The invention further provides a projection device 200, which comprises a box 201 and an optical machine 100 arranged in the box 201. The specific structure of the optical machine 100 refers to the above embodiments, and since the present photographing apparatus adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

The cabinet 201 has a mounting cavity 201a, a control element (not shown) is mounted in the mounting cavity 201a, and the optical machine 100 is mounted in the mounting cavity 201a and electrically connected to the control element, thereby completing automatic control of projection. Correspondingly, in order to realize the heat dissipation of the heating element in the box 201, the box 201 is provided with a plurality of heat dissipation holes (not labeled), so as to ensure the stable performance of the projection device 200. In the first embodiment of the corresponding drive assembly 50, the handle 55 is inserted into the receiving groove 17, and the grip panel 551 thereof directly abuts against the outer surface of the housing 201, thereby facilitating adjustment for correcting the distortion. In order to increase the connection stability between the handle 55 and the second magnetic body 53, the inner surface of the handheld plate 551 is further provided with a hook 551a, when the inner wall surface of the handheld plate 551 abuts against the outer surface of the box 201, the hook 551a is hooked on the inner surface of the box 201, so as to improve the structural stability of the handle 55, and meanwhile, the box 201 is provided with an avoiding hole 201b, so that the handle 55 can move along the avoiding hole 201b to realize the movement of the second magnetic body 53. In the second embodiment corresponding to the driving assembly 50, the box 201 is also provided with an avoiding hole 201b, so that the crank 57 is exposed to the outside for sliding by hand, thereby adjusting the position of the second magnetic body 53.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An optical bench, comprising:

a housing formed with a cavity;

the Fresnel mirror is rotatably connected to the inner wall of the cavity;

the driving assembly comprises a first magnetic body and a second magnetic body, the first magnetic body is arranged on the Fresnel mirror and abutted against the inner wall of the cavity, the second magnetic body is abutted against the outer wall surface of the shell and magnetically connected with the first magnetic body, and the second magnetic body is moved to drive the first magnetic body to move in an isolation manner so as to drive the Fresnel mirror to move;

the middle parts of two sides of the Fresnel mirror are rotatably connected with the inner side wall of the shell, the second magnetic body is installed at one end of the Fresnel mirror, and the first magnetic body drives the second magnetic body to move in an arc track in an isolated manner so as to drive the Fresnel mirror to swing;

the optical machine also comprises a lens arranged on one side of the Fresnel mirror, the shell is provided with a mounting hole for mounting the lens, and the mounting hole is communicated with the cavity;

the driving assembly further comprises a crank, the crank is mounted on the shell and can swing by taking the center of the lens as a circle center, one end of the crank is connected with the second magnetic body, and the crank is rotated to drive the second magnetic body to move in an isolated mode so as to drive the first magnetic body to move;

the top wall of the cavity is convexly provided with a mounting frame, the mounting frame is provided with the mounting hole, the mounting frame is provided with a slide way which is spaced from the mounting hole and has the same radian as the mounting hole, the crank is mounted in the slide way and slides relative to the slide way, the mounting frame is provided with an operation opening, and the crank is exposed out of the operation opening;

the mounting frame comprises a first mounting frame and a second mounting frame which are matched to form the slideway, the first mounting frame is provided with a semicircular groove, the second mounting frame is half accommodated in the semicircular groove, the center of the second mounting frame is provided with the mounting hole, the inner wall surface of the semicircular groove is concavely provided with an accommodating groove and is provided with the operation opening, the second magnetic body abuts against the inner wall surface of the accommodating groove, and the first magnetic body abuts against the outer wall surface of the accommodating groove;

the second mounting bracket is half held in the semicircular groove, the outer wall surface of the second mounting bracket and the inner wall surface of the first mounting bracket 1 are provided with clamping grooves, the two clamping grooves are in butt joint to form a slide, one end of the crank is provided with a magnet seat, a round hole is formed in the magnet seat, and the second magnet is mounted in the round hole.

2. The optical bench according to claim 1, wherein the top wall of the housing has a receiving groove recessed toward the cavity, the second magnetic member is attached to an inner sidewall of the receiving groove, and the first magnetic member is correspondingly attached to an outer wall of the receiving groove.

3. The optical bench according to claim 2, wherein a baffle is protruded from an inner top wall of the cavity, the baffle is spaced from a side wall of the accommodating groove, the second magnetic member is attached to an inner side wall of the accommodating groove, and the first magnetic member abuts against a surface of the baffle facing away from the second magnetic member.

4. The optical bench according to claim 2 or 3, wherein the driving assembly further comprises a handle, one end of the handle is connected to the second magnetic body, the other end of the handle is connected to the outer edge of the notch of the accommodating groove, and the handle is moved to drive the second magnetic body to move.

5. The optical bench of claim 1 wherein the driving assembly further comprises a link, one end of the link is connected to one end of the fresnel mirror, and the other end of the link is connected to the first magnetic body.

6. A projection device, comprising a housing and the optical engine of any one of claims 1 to 5 disposed in the housing.