CN114879437B

CN114879437B - Dodging device, projection optical machine and projection equipment

Info

Publication number: CN114879437B
Application number: CN202210537089.XA
Authority: CN
Inventors: 欧阳剑; 唐晓峰; 徐旭升; 陈仁喆; 张聪; 胡震宇
Original assignee: Shenzhen Huole Science and Technology Development Co Ltd
Current assignee: Shenzhen Huole Science and Technology Development Co Ltd
Priority date: 2022-05-17
Filing date: 2022-05-17
Publication date: 2023-07-25
Anticipated expiration: 2042-05-17
Also published as: CN114879437A

Abstract

The application discloses a dodging device, a projection light machine and projection equipment. The light homogenizing device comprises a bracket, a light homogenizing rod body and a magnetic field coil group. The support is provided with an accommodating space for accommodating the light homogenizing rod body along the length direction. The light-homogenizing rod body comprises a first light guide rod movably arranged relative to the bracket and a second light guide rod fixedly arranged relative to the bracket, and the first light guide rod and the second light guide rod are mutually overlapped to define a light outlet of the light-homogenizing rod body. The magnetic field coil group is arranged at the position of the bracket close to the light outlet. The magnetic field coil assembly comprises a magnetic part and a coil, one of the magnetic part and the coil is fixed on the first light guide rod, and the other is fixed on the bracket; when the coil is electrified, the coil generates ampere force in the magnetic field of the magnetic part, and the first light guide rod is displaced along the first direction under the action of the ampere force so as to adjust the initial size of the light outlet to the target size, thereby solving the problems of black shadow and low display brightness at the edge of the traditional projection picture and further improving the display effect and the display quality.

Description

Dodging device, projection optical machine and projection equipment

Technical Field

The application relates to the technical field of projection, in particular to a light homogenizing device, a projection light machine and projection equipment.

Background

The projection equipment can give people an open visual field because of the projection picture, and is popular with users. With the development of electronic technology and multimedia technology, the requirements of users on projection devices are also increasing. The projection effect of the projection equipment is continuously optimized, and simultaneously, the projection equipment is miniaturized, light and thin, so that the projection equipment is convenient to carry and enjoys the visual effect of a large screen at any time and any place.

The conventional projection apparatus generally includes a light source and a light homogenizing device, where the light homogenizing device is used to homogenize outgoing light emitted by the light source, and then enter a display chip of the imaging assembly, so as to form a uniform rectangular illumination spot at the display chip and cover the display chip. The light homogenizing mode of the light homogenizing device is generally two, namely compound eye light homogenizing, and uniform rectangular illumination is formed by imaging a plurality of compound eye subunits on a display chip; the other is that the rectangular dodging rod body is dodged, the rectangular dodging rod body dodges light rays which are incident to the dodging rod body inlet are received, the light rays are reflected in the dodging rod body for multiple times to form a plurality of sub-light sources, the sub-light sources are overlapped at the light outlet of the dodging rod body to form uniform rectangular illumination, then uniform rectangular light spots of the light outlet of the dodging rod body are imaged on the display chip to realize a uniform illumination scheme, and finally the display chip with uniform illuminance is projected by the lens to form a uniform picture. However, when the aspect ratio of the projection screen changes, black shadows appear at the edges of the projection screen and the display brightness of the projection screen becomes low, thereby affecting the immersion and experience of the user when watching the shadows.

Disclosure of Invention

In view of this, the present application provides a light uniformizing device, a projection light machine and a projection apparatus, so as to solve the problems of black shadows appearing at the edges of the projection screen and low display brightness.

In a first aspect, the present application provides a light homogenizing device, comprising:

the bracket is provided with an accommodating space along the length direction;

the light homogenizing rod body is accommodated in the accommodating space and comprises a light outlet; the light homogenizing rod body comprises a first light guide rod movably arranged relative to the bracket and a second light guide rod fixedly arranged relative to the bracket, and the first light guide rod and the second light guide rod are mutually overlapped to define the light outlet;

the magnetic field coil set is arranged at the position, close to the light outlet, of the bracket, and comprises a magnetic piece and a coil, one of the magnetic piece and the coil is fixed on the first light guide rod, and the other of the magnetic piece and the coil is fixed on the bracket;

when the coil is electrified, the coil generates ampere force in the magnetic field of the magnetic piece, and the first light guide rod is displaced along a first direction under the action of the ampere force so as to adjust the initial size of the light outlet to a target size, wherein the first direction is parallel to the direction of the ampere force.

In some embodiments, the light homogenizing device further comprises a first elastic element, and the first elastic element is fixed on the bracket and the first light guide rod; when the coil is electrified, the first elastic piece deforms along with the displacement of the first light guide rod, and the first light guide rod can be displaced to a preset displacement under the action of the elastic force of the first elastic piece and the ampere force, so that the size of the light outlet is adjusted to the target size; when the coil is powered off, the first elastic piece gradually recovers deformation, so that the size of the light outlet is recovered to the initial size.

In some embodiments, the light homogenizing device further includes a second elastic member, the light homogenizing rod body includes a light inlet opposite to the light outlet, and the first elastic member is disposed at a position of the support near the light inlet, where the torsional strength of the first elastic member is smaller than the torsional strength of the second elastic member.

In some embodiments, the support is further provided with a mounting groove communicated with the accommodating space, the first elastic element and the second elastic element are arranged in the corresponding mounting groove and are attached to the support and the first light guide rod, a space for avoiding the position, which is communicated with the mounting groove, is formed at the lap joint of the first light guide rod and the second light guide rod, and the first elastic element and the second elastic element can deform in the space for avoiding the position.

In some embodiments, the first elastic element and the second elastic element each include a first connection portion, two second connection portions, and a deformation portion connected between the first connection portion and the second connection portion, where the first connection portion is attached to the first light guide rod, the two second connection portions are respectively attached to the support in a corresponding manner, and the deformation portion is opposite to the second light guide rod and is spaced from the second light guide rod.

In some embodiments, the light homogenizing device further includes a control circuit board electrically connected to the coil, where the control circuit board is configured to control a current magnitude of the coil, so that a displacement amount of the first light guide rod is adjusted to a preset displacement amount, and the displacement amount of the first light guide rod has a corresponding relationship with the current magnitude of the coil.

In some embodiments, the control circuit board comprises a flexible circuit board fixed on the bracket, the light homogenizing device further comprises a magnetic inductor arranged on the flexible circuit board, the magnetic inductor is used for detecting the magnetic signal of the magnetic piece in real time, and the flexible circuit board is used for receiving the magnetic signal and acquiring the displacement of the first light guide rod according to the magnetic signal.

In some embodiments, a window communicated with the accommodating space is formed in the position, close to the light outlet, of the support, and a positioning structure connected with the magnetic field coil assembly in a matched mode is arranged at the edge of the window.

In some embodiments, the magnetic field coil assembly further comprises a magnetically permeable member, the coil comprising an active segment and an inactive segment, the magnetically permeable member disposed between the active segment and the inactive segment.

In some embodiments, the magnetic conductive member includes a first magnetic conductive plate attached to the first light conductive rod and a second magnetic conductive plate bent relative to the first magnetic conductive plate, and the coil is sleeved on the second magnetic conductive plate, and the second magnetic conductive plate is disposed opposite to the magnetic member.

In some embodiments, the magnetic conductive member further includes a third magnetic conductive plate opposite to the second magnetic conductive plate, and the magnetic member is fixed on the first magnetic conductive plate and/or the third magnetic conductive plate, and the first magnetic conductive plate, the second magnetic conductive plate, and the third magnetic conductive plate surround to form an accommodating space, and the effective section of the magnetic conductive member and the magnetic member are both accommodated in the accommodating space.

In some embodiments, the light homogenizing rod is configured as a strip structure having a hollow cavity, the first light guide rod comprises one or more,

When the number of the first light guide rods comprises one, the magnetic field coil group comprises one magnetic piece and one coil, and the magnetic piece and the coil are arranged on the same side of the first light guide rods;

when the number of the first light guide rods comprises a plurality of magnetic pieces and one coil, the magnetic field coil group comprises a plurality of magnetic pieces and one coil, one side, away from the hollow cavity, of each first light guide rod is provided with the corresponding magnetic piece, and the coils are sleeved outside the plurality of first light guide rods or are arranged on different sides of the first light guide rods with any one of the magnetic pieces; or alternatively, the process may be performed,

when the number of the first light guide rods comprises a plurality of magnetic pieces and a plurality of coils, the magnetic field coil group comprises a plurality of magnetic pieces and a plurality of coils, and one side, away from the hollow cavity, of each first light guide rod is provided with the corresponding magnetic piece and coil;

the coils are sleeved on all the magnetic pieces or are arranged opposite to the magnetic pieces side by side, and the magnetic pieces comprise at least one of N pole magnetic pole units and S pole magnetic pole units.

In some embodiments, a window which is communicated with the accommodating space is formed in the position, close to the light outlet, of the bracket, and the coil and the magnetic piece are both arranged at the position corresponding to the window; or alternatively, the process may be performed,

The light homogenizing rod comprises an extending part which extends outwards relative to the support, the coil and the magnetic piece are arranged at positions corresponding to the extending part, and the light outlet is arranged at one end of the extending part, which is away from the support.

In some embodiments, the support is configured as an integrally formed annular structure, the accommodating space is configured as a through groove, the first light guide rod is movably arranged in the through groove and is in sliding contact with the second light guide rod, and the second light guide rod is fixed on the groove wall of the through groove.

In some embodiments, the number of the second light guide rods includes two, the two second light guide rods are oppositely arranged and respectively correspondingly abut against two side edges of the first light guide rod, and a light guide chute for the first light guide rod to slide is formed between the two second light guide rods.

In some embodiments, a first limiting block and a second limiting block are disposed in the accommodating space, the first limiting block is used for being abutted to the first light guide rod, and the second limiting block is used for being abutted to the second light guide rod, so that the first light guide rod and the second light guide rod overlap each other to define the light outlet with the initial size. In a second aspect, the present application provides a projection light machine, including a light source and a light homogenizing device as described above, where the light homogenizing device is configured to homogenize incident light emitted by the light source.

In a third aspect, the present application provides a projection device comprising a projection light engine as described above.

The utility model provides a dodging device, projection ray apparatus and projection equipment is based on dodging device includes support, dodging stick body and magnetic field coil group. The support is provided with an accommodating space for accommodating the light homogenizing rod body along the length direction. The light-homogenizing rod body comprises a first light guide rod movably arranged relative to the bracket and a second light guide rod fixedly arranged relative to the bracket, and the first light guide rod and the second light guide rod are mutually overlapped to define a light outlet of the light-homogenizing rod body. The magnetic field coil group is arranged at the position of the bracket close to the light outlet. One of the magnetic member and the coil is fixed on the first light guide rod, and the other of the magnetic member and the coil is fixed on the bracket. When the coil is electrified, the coil generates ampere force in the magnetic field of the magnetic piece, the first light guide rod is displaced along the first direction under the action of the ampere force so as to adjust the initial size of the light outlet to the target size, wherein the first direction is parallel to the direction of the ampere force, so that the problems of black shadow and low display brightness at the edge of the traditional projection picture are solved, and the display effect and the display quality are improved.

Drawings

Fig. 1 is an assembly diagram of a light evening device according to an embodiment of the present disclosure.

Fig. 2 is an exploded view of the light homogenizing device of fig. 1 at a first viewing angle.

Fig. 3 is an exploded view of the light homogenizing device of fig. 1 at a second viewing angle.

Fig. 4 is a front view of the dodging device in fig. 1.

Fig. 5 is a cross-sectional view of the dodging device illustrated in fig. 4 taken along line A-A.

Fig. 6A is a schematic structural diagram of a first embodiment of a magnetic field coil assembly of the dodging device illustrated in fig. 1.

Fig. 6B is a schematic diagram illustrating a motion principle of a magnetic field coil set of the dodging device illustrated in fig. 6A.

Fig. 7A is a schematic structural diagram of a second embodiment of a magnetic field coil assembly of the dodging device illustrated in fig. 1.

Fig. 7B is a schematic diagram of a motion principle of the magnetic field coil set of the dodging device illustrated in fig. 7A.

Fig. 8A is a schematic structural diagram of a third embodiment of a magnetic field coil assembly of the dodging device illustrated in fig. 1.

Fig. 8B is a schematic diagram illustrating a motion principle of a magnetic field coil set of the dodging device illustrated in fig. 8A.

Fig. 9A is a schematic structural view of a fourth embodiment of a magnetic field coil assembly of the dodging device illustrated in fig. 1.

Fig. 9B is a schematic diagram illustrating a motion principle of a magnetic field coil set of the dodging device illustrated in fig. 9A.

Fig. 10A is a schematic structural diagram of a fifth embodiment of a magnetic field coil assembly of the dodging device illustrated in fig. 1.

Fig. 10B is a schematic diagram illustrating a motion principle of a magnetic field coil set of the dodging device illustrated in fig. 10A.

Fig. 11 is a schematic view of an optical path structure of a projection optical engine according to a first embodiment of the present disclosure.

Fig. 12 is a schematic view of an optical path structure of a projection optical engine according to a second embodiment of the present disclosure.

Fig. 13 is a schematic view of an optical path structure of a projection optical engine according to a third embodiment of the present disclosure.

Fig. 14 is a schematic view of an optical path structure of a projection optical engine according to a fourth embodiment of the present disclosure.

Fig. 15 is a schematic view of an optical path structure of a projection optical engine according to a fifth embodiment of the present disclosure.

Description of the main reference signs

Projection light machine 1000, 2000, 3000, 4000, 5000

Dodging device 100

Bracket 10

Accommodation space 101

Groove wall 102

Window 103

Mounting groove 105

Bottom plate 11

Top plate 12

Side plate 13

Positioning structure 14

First limiting block 15

Second limiting block 16

Mounting post 17

Uniform light bar body 30

Light inlet 301

Light outlet 302

Hollow cavity 303

Avoidance space 304

First light guide rod 31

Second light guide rod 32

Guide chute 320

Magnetic field coil assembly 50

Magnetic member 51

Coil 52

Effective section 521

Invalid segment 522

Magnetic conductive member 53

Accommodation space 530

First magnetic conductive plate 531

Second magnetic conductive plate 532

Third magnetic conductive plate 533

First elastic member 61

Second elastic member 62

First connecting portion 611, 621

Second connecting portion 612, 622

Deformation portion 613, 623

Magnetic inductor 70

Control circuit board 80

First circuit board 81

Second circuit board 82

Mounting hole 801

Light source 200

Light focusing system 300

Relay lens system 400

Optical prisms 500, 500a, 500b

Display chips 600, 600a, 600b, 600c, 600d

Projection lens 700

The following detailed description will further illustrate the application in conjunction with the above-described figures.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. The singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "comprising" and any variations thereof is intended to cover a non-exclusive inclusion. Furthermore, the present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following specific embodiments are provided to facilitate a more thorough understanding of the present disclosure, in which words of upper, lower, left, right, etc., indicating orientations are used solely for the illustrated structure in the corresponding figures.

The description is then made of the preferred embodiments for carrying out the present application, although the above description is made for the purpose of illustrating the general principles of the present application and is not meant to limit the scope of the present application. The scope of the present application is defined by the appended claims.

Currently, the aspect ratio of the display chip of the projection device is generally 16:9. when the user is watching 21:9, black shadows appear at the upper edge and the lower edge of the projection picture, and the immersion and experience of a user during watching are affected. This is because the upper and lower edges of the projection screen should display black without brightness due to low contrast, and actually display a black shadow with a certain brightness. The application provides a dodging device solves the problem that the shadow and the display brightness are low in the edge of the existing projection picture, so that the display effect and the display quality are improved, and the immersion feeling and the experience of a user in watching the shadow are further improved.

Referring to fig. 1 to 3, fig. 1 is an assembly diagram of an dodging device 100 according to an embodiment of the present disclosure; fig. 2 is an exploded view of the light homogenizing device 100 of fig. 1 at a first viewing angle; fig. 3 is an exploded view of the dodging device 100 illustrated in fig. 1 at a second viewing angle. The dodging device 100 includes a bracket 10, a dodging rod 30 and a magnetic field coil assembly 50. The holder 10 is provided with an accommodation space 101 in a longitudinal direction. The light-homogenizing rod 30 is accommodated in the accommodation space 101. The light bar 30 includes a light exit 302. The light-homogenizing rod 30 comprises a first light guide rod 31 movably arranged relative to the bracket 10 and a second light guide rod 32 fixedly arranged relative to the bracket 10. The first light guide rod 31 and the second light guide rod 32 overlap each other to define a light outlet 302. The magnetic field coil assembly 50 is disposed on the bracket 10 near the light outlet 302. The magnetic field coil assembly 50 includes a magnetic member 51 and a coil 52. One of the magnetic member 51 and the coil 52 is fixed to the first light guide rod 31, and the other of the magnetic member 51 and the coil 52 is fixed to the bracket 10. When the coil is energized, the coil 52 generates an ampere force in the magnetic field of the magnetic member 51, and the first light guide rod 31 is displaced in a first direction under the ampere force to adjust the initial size of the light outlet 302 to the target size, wherein the first direction is parallel to the direction of the ampere force.

Specifically, in the present embodiment, the magnetic member 51 is fixed to the first light guide rod 31, and the coil 52 is fixed to the bracket 10. When the coil 52 is energized, the coil 52 generates the ampere force in the magnetic field of the magnetic member 51, and the magnetic member 51 drives the first light guide rod 31 to displace in the opposite direction to the ampere force under the reaction force of the ampere force. In other embodiments, the coil 52 is fixed to the first light guide rod 31 and the magnetic member 51 is fixed to the bracket. When the coil 52 is energized, the coil 52 generates the ampere force in the magnetic field of the magnetic member 51, and the coil 52 drives the first light guide rod 31 to displace in the ampere force direction under the action of the ampere force. In this way, the first light guide rod 31 can be displaced relative to the second light guide rod 32 to adjust the initial size of the light outlet 302 to the target size, so as to solve the problems of black shadow and low display brightness at the edge of the existing projection screen, and further improve the display effect and display quality.

It should be understood by those skilled in the art that fig. 1 is merely an example of the light homogenizing device 100 and is not meant to be limiting of the light homogenizing device 100, and that the light homogenizing device 100 may include more or less components than those shown in fig. 1, or may combine certain components, or different components, such as the light homogenizing device 100 may also include, but not limited to, a power supply to energize the coil 52, a mounting structure for mounting the light homogenizing device 100 to an external device, and the like.

The number of the first light guide rods 31 and the second light guide rods 32 may include one or more. The light-homogenizing rod 30 is mainly described herein as including two first light-guiding rods 31 and two second light-guiding rods 32. The two first light guide rods 31 and the two second light guide rods 32 overlap each other to form a hollow cavity 303. The walls of the hollow cavity 303 are coated with a high reflection film to ensure that the light emitted from the light source maintains high reflectivity. The cross-section of the light bar 30 is rectangular in shape. In some embodiments, the cross-section of the light homogenizing rod 30 may also have a hexagonal shape or other polygonal shape. In this embodiment, the size of the light outlet 302 indicates the ratio of the length to the width of the light outlet 302, which is abbreviated as the aspect ratio of the light outlet 302. The aspect ratio of the light outlet 302 may be 16:9; alternatively, 21:9. the target size may be user-defined, or may be set by default for the light outlet 302 of the light evening device 100, which is not specifically limited in this application. For example, the initial size of the light exit 302 is 16:9, and the target size of the light exit 302 is 21:9. the aspect ratio of the light outlet 302 is merely for explanation, and is not particularly limited. The aspect ratio of the light outlet 302 of the light homogenizing rod 30 corresponds to the aspect ratio of the projection screen, so that the size of the projection screen can be adjusted by adjusting the size of the light outlet 302. In other embodiments, the size of the light outlet 302 may also indicate the area of the light outlet 302, and the like, which is not particularly limited in this application.

In the present embodiment, the window 103 communicating with the accommodating space 101 is provided at the position of the bracket 10 close to the light outlet 302, and the coil 52 and the magnetic element 51 are disposed at the positions corresponding to the window 103, so that the space occupied by the magnetic field coil assembly 50 by the light homogenizing device 100 is saved, the overall structure of the light homogenizing device 100 is more compact, and the light homogenizing device 100 is suitable for miniaturization and light and thin design. Specifically, the bracket 10 includes a bottom plate 11, a top plate 12, and two opposite side plates 13. The bottom plate 11, the top plate 12, and the two side plates 13 together define a housing space 101 for housing the light-equalizing rod 30. The two first light guide rods 31 are installed at positions of the bracket 10 corresponding to the two side plates 13, and the two second light guide rods 32 are arranged at positions of the bracket 10 corresponding to the bottom plate 11 and the top plate 12. The window 103 is opened in the side plate 13 of the bracket 10 to expose the first light guide bar 31, thereby facilitating the installation of the magnetic member 51 and the coil 52. The first light guide rod 31 is movable relative to the bracket 10 and the second light guide rod 32. Specifically, the first light guide rod 31 is movably disposed in the accommodating space 101 and slidably abuts against the second light guide rod 32, and the second light guide rod 32 is fixed on the groove wall 102 of the accommodating space 101, so that the first light guide rod 31 is ensured to always overlap the second light guide rod 32, the light leakage phenomenon is avoided, and the light homogenizing effect of the light homogenizing device 100 is improved. Preferably, the bracket 10 is configured as an integrally formed annular structure, the accommodating space 101 is configured as a through groove, the first light guide rod 31 is movably arranged in the through groove and is slidably abutted against the second light guide rod 32, and the second light guide rod 32 is fixed on the groove wall 102 of the through groove, so that the mounting precision of the light homogenizing rod 30 can be improved while stable support is provided for the light homogenizing rod 30, and the phenomenon of light leakage of the light homogenizing rod 30 is avoided.

In some embodiments, the light homogenizing rod includes an extension portion (not shown) extending outwards relative to the bracket 10, the coil 52 and the magnetic element 51 are disposed at positions corresponding to the extension portion, and the light outlet 302 is disposed at one end of the extension portion facing away from the bracket 10, so as to facilitate assembly and simplify the manufacturing process of the bracket 10. Specifically, the coil 52 is attached to the end face of the bracket 10.

Specifically, in some embodiments, the number of the second light guide rods 32 includes two, the two second light guide rods 32 are disposed opposite to each other and respectively abut against two side edges of the first light guide rod 31, and a sliding guide groove 320 for sliding the first light guide rod 31 is formed between the two second light guide rods 32. Since the first light guide rod 31 is limited to move in the guide chute 320, the first light guide rod 31 can be ensured to be always tightly attached to the first light guide rod 31, thereby avoiding the phenomenon of light leakage of the light evening device 100.

Referring to fig. 1 to 6B together, in some embodiments, a first limiting block 15 and a second limiting block 16 are disposed in the accommodating space 101, the first limiting block 15 is used for being abutted against the first light guiding rod 31, and the second limiting block 16 is used for being abutted against the second light guiding rod 32, so that the first light guiding rod 31 and the second light guiding rod 32 overlap each other to define a light outlet 302 with an initial size, thereby reducing the contact area between the first light guiding rod 31 and the second light guiding rod 32 and facilitating assembly.

In this embodiment, the light homogenizing device 100 further includes a first elastic member 61. The first elastic member 61 is fixed to the bracket 10 and the first light guide rod 31. When the coil 52 is energized, the first elastic member 61 deforms along with the displacement of the first light guide rod 31, and the first light guide rod 31 can be displaced to a preset displacement under the action of the elastic force and ampere force of the first elastic member 61, so that the size of the light outlet 302 is adjusted to the target size. When the coil 52 is de-energized, the first elastic member 61 gradually resumes the deformation, so that the size of the light outlet 302 is restored to the original size. Optionally, the first elastic member 61 is close to the magnetic field coil assembly 50 to better balance the stress of the end of the first light guide rod 31 close to the light outlet 302.

The light homogenizing rod 30 further comprises a light inlet 301 opposite to the light outlet 302. The dodging rod body 30 is fixedly arranged on the light inlet 301 side relative to the bracket 10, and the dodging rod body 30 is movably arranged on the light outlet 302 side relative to the bracket 10, so that the magnetic field coil assembly 50 for driving the first light guide rod 31 to move is arranged at the light outlet 302 end of the dodging rod body 30, the integral structure of the dodging device 100 is simplified, and the dodging effect of the dodging device 100 is improved. Specifically, in the present embodiment, the light evening device 100 further includes a second elastic member 62, and the first elastic member 61 is disposed at a position of the support 10 near the light inlet 301. Wherein the torsional strength of the first elastic member 61 is smaller than the torsional strength of the second elastic member 62. In this way, when the first light guide rod 31 moves towards the center of the support 10 relative to the support 10, the first elastic member 61 can be used to balance the ampere force reaction force of the coil 52 acting on the magnet, so as to stop moving when the first light guide rod 31 is displaced for a certain distance, so that the situation that the first elastic member 61 is disconnected from the support 10 and the first light guide rod 31 due to overlarge displacement of the first light guide rod 31 and the situation that the deformation of the first elastic member 61 is overlarge and the first light guide rod 31 cannot be driven to reset is avoided. In addition, since the torsional strength of the second elastic member 62 is relatively large, the displacement of the end of the first light guide rod 31 near the light outlet 302 is greater than the displacement of the first light guide rod 31 near the light inlet 301, so that the hollow cavity 303 of the light homogenizing rod 30 is substantially cone-shaped. At this time, the light inlet 301 of the light-homogenizing rod 30 is fixed relative to the support 10, and the light outlet 302 is movably disposed relative to the support 10, so that the light-homogenizing effect of the light-homogenizing rod 30 is improved, and the second elastic member 62 provides a vertical supporting effect on the first light-guiding rod 31, so that the motion stability of the first light-guiding rod 31 is improved.

The bracket 10 is further provided with a mounting groove 105 communicated with the accommodating space 101, the first elastic piece 61 and the second elastic piece 62 are arranged in the corresponding mounting groove 105 and are attached to the bracket 10 and the first light guide rod 31, a space 304 communicated with the mounting groove 105 is formed at the joint of the first light guide rod 31 and the second light guide rod 32, and the first elastic piece 61 and the second elastic piece 62 can deform in the space 304. Optionally, a clearance space 304 is also formed between the first limiting block 15 and the second limiting block 16 and the groove wall 102 of the accommodating space 101, so that the space required by the deformation of the first elastic member 61 and the second elastic member 62 is further increased, and other structures of the light evening device 100 are convenient to install.

The first elastic member 61 and the second elastic member 62 may be fixed to the bracket 10 and the first light guide rod 31 by means of gluing, welding, locking of a mounting structure, etc. The first elastic member 61 includes a first connection portion 611, two second connection portions 612, and a deformation portion 613 connecting between the first connection portion 611 and each of the second connection portions 612. The second elastic member 62 includes a first connection portion 621, two second connection portions 622, and a deformation portion 623 connecting between the first connection portion 621 and each of the second connection portions 622. The first connecting portions 611 and 621 are attached to the first light guiding rod 31. The two second connecting portions 612 and 622 are respectively attached to the bracket 10. The deformed portions 613 and 623 are opposed to the second light guide rod 32 and are disposed at a distance from the second light guide rod 32.

The torsional strength of the deformed portion 613 of the first elastic member 61 is smaller than the torsional strength of the deformed portion 623 of the second elastic member 62, i.e., the bending amplitude of the deformed portion 613 of the first elastic member 61 is relatively large and the bending amplitude of the deformed portion 623 of the second elastic member 62 is relatively small. Wherein the shape of the first elastic member 61 is different from the shape of the second elastic member 62. The first elastic member 61 has a candy shape, and the second elastic member 62 has a serpentine shape. Specifically, the number of bending points formed between the first connection portion 611 and the second connection portion 612 of the first elastic member 61 and the deformation portion 613 is greater than the number of bending points formed between the first connection portion 621 and the second connection portion 622 of the second elastic member 62 and the deformation portion 623. In the present embodiment, two bending points are formed between the first connection portion 611 and the second connection portion 612 of the first elastic member 61 and the deformation portion 613, respectively, and one bending point is formed between the first connection portion 621 and the second connection portion 622 of the second elastic member 62 and the deformation portion 623, respectively. The bending point may be designed according to the maximum displacement amount of the first light guide rod 31, and the present application is not particularly limited. The first elastic member 61 and the second elastic member 62 may be, but are not limited to, a structure having elasticity of a reed, rubber, or the like.

In this embodiment. The light evening device 100 further includes a control circuit board 80 electrically connected to the coil 52, where the control circuit board 80 is used to control the current level of the coil 52, so that the displacement of the first light guide rod 31 is adjusted to a preset displacement. The displacement of the first light guide rod 31 has a corresponding relationship with the current of the coil 52, so that the displacement of the first light guide rod 31 can be controlled more precisely, the display proportion of the projection picture can be adjusted rapidly, and the immersion and experience of the user during watching can be improved.

Optionally, the control circuit board 80 comprises a flexible circuit board secured to the stand 10. The light homogenizing device 100 further comprises a magnetic sensor 70 disposed on the flexible circuit board. The magnetic sensor 70 is used for detecting the magnetic signal of the magnetic member 51 in real time. The flexible circuit board is used for receiving the magnetic signals and acquiring the displacement of the first light guide rod 31 according to the magnetic signals. In this way, the light evening device 100 can quickly obtain the real-time position of the first light guide rod 31 based on the obtained magnetic signal of the magnetic member 51, so as to accurately and quickly adjust the display proportion of the projection screen.

In the present embodiment, the flexible circuit board includes a first circuit board 81 and a second circuit board 82 provided to be bent with respect to the first circuit board 81. The second circuit board 82 covers the magnetic member 51 and is provided with the magnetic sensor 70, so that the magnetic sensor 70 is located in the magnetic field range of the magnetic member 51, the detection range of the magnetic sensor 70 is reduced, the structure is compact, and the accuracy and efficiency of adjusting the display proportion of the projection picture are improved. The flexible circuit board is fixed to the bracket 10. Specifically, the first circuit board 81 and the second circuit board 82 are provided with a plurality of mounting holes 801, and the bracket 10 is provided with mounting posts 17 which are connected with the mounting holes 801 in a matching manner, so that the assembly and disassembly are convenient, and the structure is simplified.

Optionally, a window 103 communicated with the accommodating space 101 is formed at a position of the bracket 10 close to the light outlet 302, and a positioning structure 14 in fit connection with the magnetic field coil assembly 50 is arranged at the edge of the window 103, so that the magnetic field coil assembly 50 is convenient to assemble. In this embodiment, the positioning structure 14 is cooperatively coupled with the coils 52 of the magnetic field coil assembly 50. Specifically, the coil 52 is fixed to the positioning structure 14. Because the coil 52 is annular in shape, the positioning structure 14 is configured as a curved surface matched with the shape of the coil 52, so that the contact area between the bracket 10 and the coil 52 is increased, and the connection stability and reliability between the coil 52 and the bracket 10 are further improved. Preferably, the coil 52 is fixed to the support 10 by a heat conductive glue, thereby achieving efficient heat dissipation of the coil 52. In some embodiments, the positioning structure 14 is cooperatively connected with the magnetic member 51 of the magnetic field coil assembly 50, and the shape of the positioning structure 14 is matched with the shape of the coil 52, so that the connection stability and reliability between the magnetic member 51 and the positioning structure 14 are improved.

In some embodiments, the magnetic field coil assembly 50 further includes a magnetically permeable member 53. The coil 52 includes an effective section 521 and an ineffective section 522, and the magnetic conductive member 53 is disposed between the effective section 521 and the ineffective section 522. Wherein the current direction of inactive segment 522 is opposite to the current direction of active segment 521. Thus, the magnetic field of the inactive section 522 of the coil 52 is shielded by the magnetic conductive member 53, and the magnetic field of the active section 521 of the coil 52 is enhanced, thereby greatly improving the utilization rate of the magnetic field. When the coil 52 is energized, the effective section 521 can generate an ampere force under the magnetic field of the magnetic element 51 to drive the first light guide rod 31 to displace along the opposite direction of the ampere force, and the magnetic field generated by the magnetic element 51 returns the magnetic field direction to the magnetic element 51 through the magnetic guide plate, so that the problems that the displacement of the first light guide plate is slow and the displacement error amount is large due to the fact that the ineffective section 522 also generates another ampere force with opposite direction under the magnetic field of the magnetic element 51 are avoided.

The magnetic conductive piece 53 is movably arranged in the coil 52 in a penetrating way, and the magnetic piece 51 is fixed on the first light guide rod 31 through the magnetic conductive piece 53, so that the magnetic piece 51 drives the first light guide rod 31 to displace along the opposite direction of ampere force under the action of ampere force reaction force. Specifically, the magnetic conductive member 53 includes a first magnetic conductive plate 531 attached to the first light conductive rod 31 and a second magnetic conductive plate 532 bent relative to the first magnetic conductive plate 531, the coil 52 is sleeved on the second magnetic conductive plate 532, and the second magnetic conductive plate 532 is disposed opposite to the magnetic member 51, so that a closed magnetic field line is formed between the magnetic member 51 and the magnetic conductive member 53, and an effective section 521 of the coil 52 is located between the magnetic member 51 and the magnetic conductive member 53, so that a magnetic field generated by the magnetic member 51 is effectively utilized. In this embodiment, the magnetic conductive member 53 further includes a third magnetic conductive plate 533 disposed opposite to the second magnetic conductive plate 532, the magnetic member 51 is fixed on the first magnetic conductive plate 531 and/or the third magnetic conductive plate 533, the first magnetic conductive plate 531, the second magnetic conductive plate 532 and the third magnetic conductive plate 533 surround to form an accommodating space 530, and the effective section 521 of the magnetic conductive member 53 and the magnetic member 51 are accommodated in the accommodating space 530, so that the structure is simplified, and the stability and reliability of the connection between the magnetic member 51 and the first light guide rod 31 are enhanced.

Wherein the magnetic member 51 includes, but is not limited to, at least one of a magnet and a magnetic alloy element. Magnetic sensor 70 includes, but is not limited to, one or more of a linear tunnel magnetoresistive sensor, a linear hall sensor, an anisotropic magnetoresistive sensor, and a giant magnetoresistive sensor. It can be appreciated that the above-mentioned sensor can be matched with the magnetic member 51 to achieve a better sensing effect, which is beneficial to focusing accuracy. Among these, the magnetic sensor 70 is preferably a linear tunnel magneto-resistance sensor and a linear hall sensor. The linear tunnel magneto-resistance sensor and the linear hall sensor map the linear distance change of the magnetic element 51 relative to the sensor through the change of the magnetic flux density, and the displacement information of the magnetic element 51 is obtained through conversion.

The light-homogenizing rod 30 is configured in a bar-like structure having a hollow cavity 303, and the first light-guiding rod 31 includes one or more. When the number of the first light guide rods 31 includes one, the magnetic field coil assembly 50 includes one magnetic member 51 and one coil 52, and the magnetic member 51 and the coil 52 are disposed on the same side of the first light guide rods 31. When the number of the first light guide rods 31 includes a plurality of magnetic elements 51 and a coil 52, a corresponding magnetic element 51 is disposed on a side of each first light guide rod 31 facing away from the hollow cavity 303, and the coil 52 is sleeved outside the plurality of first light guide rods 31 or the coil 52 and any one of the magnetic elements 51 are disposed on different sides of the first light guide rods 31. When the number of the first light guide rods 31 includes a plurality of magnetic members 51 and a plurality of coils 52, the magnetic field coil group 50 includes a plurality of magnetic members 51 and a plurality of coils 52, and a side of each first light guide rod 31 facing away from the hollow cavity 303 is provided with a corresponding magnetic member 51 and coil 52. The coil 52 is sleeved on all the magnetic pieces 51 or the coil 52 and all the magnetic pieces 51 are arranged side by side and opposite to each other. The magnetic member 51 includes at least one of an N-pole unit and an S-pole unit.

Referring to fig. 2, fig. 6A and fig. 6B together, in the first embodiment, the number of the first light guide rods 31 includes two, and the magnetic field coil assembly 50 includes two magnetic members 51, two coils 52 and two magnetic conductive members 53. The two magnetic members 51 are respectively configured as an N-pole magnetic pole unit and an S-pole magnetic pole unit. One side of each first light guide rod 31, which faces away from the hollow cavity 303, is provided with a corresponding magnetic element 51, coil 52 and magnetic conductive element 53. The same side coil 52 is arranged side by side with the magnetic member 51 at intervals. The current direction D2 of the coil 52 is counterclockwise. The magnetic field direction D1 of the magnetic member 51 is perpendicular to the current direction D2. Specifically, the magnetic induction line starts from the N pole unit, passes through the annular coil 52 to the side close to the N pole unit (i.e., the effective section 522 of the coil 52), and flows into the inside of the magnetic conductive member 53 to return to the S pole unit. The magnetic element 51 and the magnetic conductive element 53 form a closed magnetic field line in a counterclockwise direction D1, so that the magnetic field of the inactive section 522 of the energized coil 52 is shielded, thereby enhancing the magnetic field of the active section 521 of the coil 52 and further improving the utilization rate of the magnetic field. The effective section 521 can generate an ampere force F1 under the magnetic field of the magnetic element 51, and since the coil 52 is fixed on the bracket 10, the two magnetic elements 51 are respectively fixed on the corresponding first light guide rods 31, so that the two magnetic elements 51 are both driven by the ampere force reaction force F2 to displace along the opposite direction of the ampere force, so as to drive the two first light guide rods 31 to approach each other and generate relative motion, thereby realizing the adjustment of the aspect ratio of the light outlet 302, namely the adjustment of the aspect ratio of the projection picture, not only solving the problems of black shadow and low display brightness at the edge of the existing projection picture, but also improving the display effect and display quality, and improving the immersion feeling and experience of the user during watching.

Referring to fig. 2, 7A and 7B together, in the second embodiment, the number of the first light guide rods 31 includes two, and the magnetic field coil set 50 includes two magnetic members 51 and two coils 52. One side of each first light guide rod 31, which is away from the hollow cavity 303, is provided with a corresponding magnetic piece 51 and a coil 52, the coils 52 on the same side are arranged opposite to the magnetic pieces 51 side by side, and the coils 52 are arranged on one side of the magnetic pieces 51, which is away from the first light guide rods 31. The current direction D2 of the coil 52 is counterclockwise. The magnetic field direction D1 of the magnetic member 51 is perpendicular to the current direction D2. The coil 52 can generate an ampere force F1 under the magnetic field of the magnetic members 51, and since the coil 52 is fixed on the bracket 10, the two magnetic members 51 are respectively fixed on the corresponding first light guide rods 31, and therefore, the two magnetic members 51 are both subjected to the ampere force reaction force F2 to drive the first light guide rods 31 to displace along the direction opposite to the ampere force, so as to drive the two first light guide rods 31 to approach each other to perform relative motion.

Referring to fig. 2, 8A and 8B together, in the third embodiment, the number of the first light guide rods 31 includes two, and the magnetic field coil set 50 includes two magnetic members 51 and one coil 52. One side of each first light guide rod 31 facing away from the hollow cavity 303 is provided with a corresponding one of the magnetic members 51. The coil 52 is sleeved outside the two magnetic pieces 51 and the two first light guide rods 31. The current direction D2 of the coil 52 is clockwise. The magnetic field direction D1 of the magnetic member 51 is perpendicular to the current direction D2. The coil 52 can generate an ampere force F1 under the magnetic field of the magnetic members 51, and since the coil 52 is fixed on the bracket 10, the two magnetic members 51 are respectively fixed on the corresponding first light guide rods 31, and therefore, the two magnetic members 51 are both subjected to the ampere force reaction force F2 to drive the first light guide rods 31 to displace along the direction opposite to the ampere force, so as to drive the two first light guide rods 31 to approach each other to perform relative motion.

Referring to fig. 2, 9A and 9B together, in the fourth embodiment, the number of the first light guide rods 31 includes two, and the magnetic field coil set 50 includes two magnetic members 51 and two coils 52. One side of each first light guide rod 31 facing away from the hollow cavity 303 is provided with a corresponding one of the magnetic members 51 and coil. Each of the magnetic pieces 51 includes an N-pole magnetic pole unit and an S-pole magnetic pole unit. The N-pole magnetic pole unit and the S-pole magnetic pole unit of each magnetic member 51 and each first light guide rod 31 are disposed above or below the corresponding coil 52, that is, each magnetic member 51 and each first light guide rod 31 are disposed on the same side of the corresponding coil 52. The current direction D2 of the coil 52 is clockwise. The magnetic field direction D1 of the magnetic member 51 is perpendicular to the current direction D2. The coil 52 can generate an ampere force F1 under the magnetic field of the magnetic members 51, and since the coil 52 is fixed on the bracket 10, the two magnetic members 51 are respectively fixed on the corresponding first light guide rods 31, and therefore, the two magnetic members 51 are both subjected to the ampere force reaction force F2 to drive the first light guide rods 31 to displace along the direction opposite to the ampere force, so as to drive the two first light guide rods 31 to approach each other to perform relative motion.

Referring to fig. 2, 10A and 10B together, in the fifth embodiment, the number of the first light guide rods 31 includes two, and the magnetic field coil assembly 50 includes two magnetic members 51 and one coil 52. One side of each first light guide rod 31 facing away from the hollow cavity 303 is provided with a corresponding one of the magnetic members 51. The two magnetic members 51 and the two first light guide rods 31 are disposed above or below the coil 52, i.e. the two magnetic members 51 and the two first light guide rods 31 are disposed on the same side of the coil 52. The current direction D2 of the coil 52 is clockwise. The magnetic field direction D1 of the magnetic member 51 is perpendicular to the current direction D2. The coil 52 can generate an ampere force F1 under the magnetic field of the magnetic members 51, and since the coil 52 is fixed on the bracket 10, the two magnetic members 51 are respectively fixed on the corresponding first light guide rods 31, and therefore, the two magnetic members 51 are both subjected to the ampere force reaction force F2 to drive the first light guide rods 31 to displace along the direction opposite to the ampere force, so as to drive the two first light guide rods 31 to approach each other to perform relative motion.

The magnetic conductive member 53 of the magnetic field coil assembly 50 of the first embodiment is also applicable to the magnetic field coil assemblies of the second to fifth embodiments. The number and arrangement of the magnetic members 51 and the coils 52 are merely illustrative, and are not particularly limited.

Referring to fig. 11, a projection optical engine 1000 according to a first embodiment of the present application is provided. The projection light machine 1000 includes the light source 200 and the light homogenizing device 100 as described above. The light evening device 100 is used for evening incident light emitted by the light source 200. The projector engine 1000 may be, but is not limited to, an electronic device with a projection function such as a liquid crystal on silicon (liquid crystal on silicon, LCoS) projector, a liquid crystal display (liquid crystal display, LCD) projector, a digital light processing (digital light processor, DLP) projector, etc. The light source 200 may be a collimated light source or a non-collimated light source. Light source 200 includes, but is not limited to, a laser, LED, or other light source. The projection optical engine 1000 further includes, but is not limited to, a condensing system 300, a relay lens system 400, an optical prism 500, a display chip 600, a projection lens 700, and the like, which are sequentially disposed on the light-emitting path.

Specifically, in the present embodiment, the light source 200 is configured as a collimated light source. The optical prism 500 is configured as a polarization splitting (polarization beam splitter, PBS) prism. The display chip is configured as an LCoS chip. The collimated light source is focused to the light inlet 301 of the light homogenizing rod 30 of the light homogenizing device 100 after passing through the light condensing system 300, the light is reflected for several times in the light homogenizing rod 30, then the light outlet 302 of the light homogenizing rod forms a uniform rectangular light spot, the light reflected by the PBS prism is imaged on the LCoS chip through the relay lens system 400 and the PBS prism, and finally the illuminated effective area of the LCoS chip is projected through the projection lens 700.

As shown in fig. 12, in the second embodiment, the light source 200 of the projection light machine 2000 is configured as a collimated light source, the optical prism 500a includes a total internal reflection (total internal reflector, TIR) prism 501 and a compensation prism 502, and the display chip 600a is configured as a DLP chip. The collimated light source is focused to the light inlet 301 of the light homogenizing rod 30 after passing through the light condensing system 300, the light is reflected for several times in the light homogenizing rod 30, then the light outlet 302 of the light homogenizing rod 30 forms a uniform rectangular light spot, the light is imaged on the DLP chip through the relay lens system 400, the TIR prism 501 and the compensation prism 502, and finally the illuminated effective area of the DLP chip is projected through the projection lens 700.

As shown in fig. 13, in the third embodiment, the light source 200 of the projector 3000 is configured as a collimated light source, the optical prism 500b is configured as a refractive total reflection prism (refraction total internal reflection, RTIR), and the display chip 600b is configured as a DLP chip. The collimated light source is focused to the light inlet 301 of the light homogenizing rod 30 after passing through the light condensing system 300, and the light is reflected for several times in the light homogenizing rod 30, and then the light outlet 302 of the light homogenizing rod 30 forms a uniform rectangular light spot, and passes through the relay lens system 400 and the RTIR prism. Light totally reflected by the RTIR prism is imaged on the DLP chip, and finally the illuminated active area of the DLP chip is projected by the projection lens 700.

As shown in fig. 14, in the fourth embodiment, the projection light machine 4000 may not include an optical prism. The light source 200 of the projector light machine 4000 is configured as a collimated light source, and the display chip 600c is configured as an LCD chip. The collimated light source is focused to the light inlet 301 of the light homogenizing rod 30 after passing through the light condensing system 300, the light is reflected for several times in the light homogenizing rod 30, then the light outlet 302 of the light homogenizing rod 30 forms a uniform rectangular light spot, then the uniform rectangular light spot is imaged on the LCD chip through the relay lens system 400, and finally the illuminated effective area of the LCD chip is projected through the projection lens 700.

As shown in fig. 15, in the fifth embodiment, the projection light machine 5000 may not include an optical prism and a relay lens system. The light source 200 of the projection light engine 5000 may be configured as a collimated light source or a non-collimated light source. The display chip 600d is configured as an LCD chip. The collimated light source directly irradiates the light inlet 301 of the light homogenizing rod 30, the light is reflected for several times in the light homogenizing rod 30, then the light outlet 302 of the light homogenizing rod 30 forms a uniform rectangular light spot, the light emitted from the light homogenizing rod 30 is imaged on the LCD chip, and finally the illuminated effective area of the LCD chip is projected through the projection lens 700. The non-collimated light source is closely attached to the light inlet 301 of the light homogenizing rod 30 or is a small distance away from the light inlet 301 of the light homogenizing rod 30, so that the light incident into the light homogenizing rod 30 is increased, and the projection effect is further improved.

The embodiment of the application also provides projection equipment, which comprises the projection optical machines 1000, 2000, 3000, 4000 and 5000. Projection devices may also include, but are not limited to, housings, circuit boards, heat dissipating modules, and the like. The circuit board is electrically connected with the heat dissipation module and the projection light machine 1000, 2000, 3000, 4000 and 5000, and the heat dissipation module is fixed on the shell around the projection light machine 1000, 2000, 3000, 4000 and 5000 so as to realize that the circuit board controls the heat dissipation module to dissipate heat of the projection light machine 1000, 2000, 3000, 4000 and 5000.

The foregoing has outlined rather broadly the more detailed description of embodiments of the invention, wherein the principles and embodiments of the invention are explained in detail using specific examples, the above examples being provided solely to facilitate the understanding of the method and core concepts of the invention; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.

Claims

1. A light homogenizing device, comprising:

the bracket is provided with an accommodating space along the length direction;

2. The light homogenizing apparatus of claim 1, further comprising a first elastic member, the first elastic member being fixed to the bracket and the first light guide bar; when the coil is electrified, the first elastic piece deforms along with the displacement of the first light guide rod, and the first light guide rod can be displaced to a preset displacement under the action of the elastic force of the first elastic piece and the ampere force, so that the size of the light outlet is adjusted to the target size; when the coil is powered off, the first elastic piece gradually recovers deformation, so that the size of the light outlet is recovered to the initial size.

3. The light homogenizing apparatus of claim 2 further comprising a second elastic member, wherein the homogenizing rod comprises a light inlet opposite the light outlet, and wherein the first elastic member is disposed on the support adjacent the light inlet, wherein the torsional strength of the first elastic member is less than the torsional strength of the second elastic member.

4. The light homogenizing device of claim 3 wherein the bracket is further provided with a mounting groove communicated with the accommodating space, the first elastic element and the second elastic element are arranged in the corresponding mounting groove and are attached to the bracket and the first light guide rod, a space which is communicated with the mounting groove is formed at the joint of the first light guide rod and the second light guide rod, and the first elastic element and the second elastic element can deform in the space.

5. The light homogenizing device of claim 3 wherein the first elastic member and the second elastic member each comprise a first connecting portion, two second connecting portions, and a deformation portion connecting the first connecting portion and the second connecting portion, wherein the first connecting portion is attached to the first light guide bar, the two second connecting portions are respectively attached to the bracket in a corresponding manner, and the deformation portion is opposite to the second light guide bar and is spaced apart from the second light guide bar.

6. The light homogenizing apparatus of claim 1, further comprising a control circuit board electrically connected to the coil, the control circuit board configured to control a current magnitude of the coil such that a displacement amount of the first light guide bar is adjusted to a preset displacement amount, wherein the displacement amount of the first light guide bar has a correspondence with the current magnitude of the coil.

7. The light homogenizing apparatus of claim 6 wherein the control circuit board comprises a flexible circuit board fixed to the support, the light homogenizing apparatus further comprises a magnetic sensor disposed on the flexible circuit board, the magnetic sensor is configured to detect a magnetic signal of the magnetic element in real time, and the flexible circuit board is configured to receive the magnetic signal and obtain a displacement of the first light guide bar according to the magnetic signal.

8. The dodging device as recited in claim 1, wherein a window communicating with said receiving space is provided at a position of said bracket adjacent to said light outlet, and a positioning structure connected with said magnetic field coil assembly is provided at an edge of said window.

9. The light homogenizing apparatus of claim 1 wherein the magnetic field coil assembly further comprises a magnetically permeable member, the coil comprising an active segment and an inactive segment, the magnetically permeable member disposed between the active segment and the inactive segment.

10. The light homogenizing device of claim 9, wherein the magnetic conductive member comprises a first magnetic conductive plate attached to the first light conductive rod and a second magnetic conductive plate bent relative to the first magnetic conductive plate, the coil is sleeved on the second magnetic conductive plate, and the second magnetic conductive plate is disposed opposite to the magnetic member.

11. The light evening device of claim 10, wherein the magnetic conductive member further comprises a third magnetic conductive plate opposite to the second magnetic conductive plate, the magnetic member is fixed on the first magnetic conductive plate and/or the third magnetic conductive plate, an accommodating space is formed by surrounding the first magnetic conductive plate, the second magnetic conductive plate and the third magnetic conductive plate, and the effective section of the magnetic conductive member and the magnetic member are accommodated in the accommodating space.

12. The light evening device of claim 1, wherein said light evening bar body is configured as a strip structure having a hollow cavity, said first light guide bar comprises one or more,

13. The dodging device as claimed in claim 1, wherein a window communicating with said accommodation space is provided at a position of said bracket near said light outlet, and said coil and said magnetic member are both disposed at positions corresponding to said window; or alternatively, the process may be performed,

14. The light homogenizing apparatus of claim 1 wherein the bracket is configured as an integrally formed annular structure, the receiving space is configured as a through slot, the first light guide rod is movably disposed in the through slot and slidingly abuts the second light guide rod, and the second light guide rod is fixed on a wall of the through slot.

15. The light homogenizing device of claim 1, wherein the number of the second light guide bars comprises two, the two second light guide bars are oppositely arranged and respectively correspondingly abut against two side edges of the first light guide bar, and a light guide chute for sliding the first light guide bar is formed between the two second light guide bars.

16. The light evening device as recited in claim 1 wherein a first stopper and a second stopper are disposed in the accommodating space, the first stopper is configured to abut against the first light guiding rod, and the second stopper is configured to abut against the second light guiding rod, so that the first light guiding rod and the second light guiding rod overlap each other to define the light outlet with an initial size.

17. A projection light machine, comprising a light source and a light homogenizing device according to any one of claims 1 to 16, wherein the light homogenizing device is configured to homogenize incident light emitted by the light source.

18. A projection device comprising a projection engine as claimed in claim 17.