CN113031383B

CN113031383B - Projector lens assembly and projector

Info

Publication number: CN113031383B
Application number: CN202110283702.5A
Authority: CN
Inventors: 欧阳剑; 常征; 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: 2021-03-16
Filing date: 2021-03-16
Publication date: 2022-04-19
Anticipated expiration: 2041-03-16
Also published as: CN113031383A

Abstract

The utility model provides a projector lens subassembly and projector, projector lens subassembly includes the reflection piece, the installation component, drive structure, first drive assembly, first support and first lens group, the reflection piece sets up on the installation component, the reflection piece is used for projecting projection picture to the target location, drive structure is used for driving the installation component and drives the reflection piece rotatory, in order to rectify the projection picture of target location department, first lens group sets up on first support, first drive assembly is used for driving first support and drives first lens group and be close to or keep away from the reflection piece and remove, so that it is clear to focus. The first driving assembly drives the first support to drive the first lens group with the focusing function to be close to or far away from the reflecting piece to move so as to complete focusing, and therefore the focusing function and the correction function of the projection picture are achieved simultaneously.

Description

Projector lens assembly and projector

Technical Field

The invention belongs to the technical field of projection, and particularly relates to a projector lens assembly and a projector with the same.

Background

The ultra-short-focus projector is one of the mainstream projection schemes of the current intelligent projection and laser television products, and has the main advantages that a large enough picture can be projected in a short distance, compared with other medium-long-focus projectors, the projection mode can obviously save the projection space, and the projector can be directly placed at a position close to a curtain or a wall. However, due to the imaging principle, the ultra-short focus projection has a complex optical structure and is sensitive to the placement position, and a slight placement error may cause large distortion of the image.

The existing ultra-short-focus projector cannot simultaneously realize the correction of automatic focusing and image distortion deformation, and needs to manually adjust the position of the ultra-short-focus projector for correction, so that the efficiency is low, and the correction effect is not ideal.

Disclosure of Invention

The invention aims to provide a projector lens assembly and a projector, which can realize the focusing function and the projection picture correction function at the same time.

In order to realize the purpose of the invention, the invention provides the following technical scheme:

in a first aspect, the present invention provides a projector lens assembly, where the projector lens assembly includes a reflection element, a mounting element, a driving structure, a first driving element, a first support, and a first lens group, the reflection element is disposed on the mounting element, the reflection element is configured to reflect a projection picture to a target position, the driving structure is configured to drive the mounting element to drive the reflection element to rotate so as to correct the projection picture at the target position, the first lens group is disposed on the first support, and the first driving element is configured to drive the first support to drive the first lens group to move closer to or away from the reflection element, so that the projection picture at the target position is focused clearly.

In one embodiment, the lens assembly of the projector further includes a housing, and the reflector, the mounting assembly, the first bracket and the first lens assembly are disposed in the housing, the mounting assembly is rotatably connected to the housing, and the first bracket is movably connected to the housing.

In one embodiment, the lens assembly of the projector further includes a second driving assembly, and a second bracket and a second lens group both disposed in the housing, the second bracket is movably connected to the housing, the second lens group is disposed on the second bracket, the second bracket is disposed between the first bracket and the reflector, the second driving assembly is configured to drive the second bracket to drive the second lens group to move relative to the housing so as to be close to or away from the reflector, and the second lens group is configured to change a throw ratio of the projection image.

In one embodiment, the first driving assembly includes a first electromagnetic mating part and a second electromagnetic mating part which are oppositely arranged, the first electromagnetic mating part is arranged on the shell, and the second electromagnetic mating part is arranged on the first bracket; the first electromagnetic matching piece or the second electromagnetic matching piece is used for being electrified to generate a magnetic field, so that the second electromagnetic matching piece receives magnetic field force and drives the first support and the first lens group to move relative to the shell.

In one embodiment, the second electromagnetic matching element includes a first matching surface, a second matching surface and a third matching surface, which are connected in sequence, the first matching surface, the second matching surface and the third matching surface are used for being connected with the first bracket, a plane on which the first matching surface is located is perpendicular to a plane on which the third matching surface is located, and the first matching surface and the third matching surface form an included angle greater than 90 degrees with the second matching surface.

In one embodiment, the projector lens assembly further includes a first position sensor, and the first position sensor is configured to detect a moving distance of the second electromagnetic fitting with respect to the first electromagnetic fitting.

In one embodiment, the projector lens assembly further includes a circuit board disposed at an outer periphery of the housing, the first electromagnetic matching element and the first position sensor are electrically connected to the circuit board, and the circuit board is configured to control a current of the first electromagnetic matching element according to a moving distance of the second electromagnetic matching element relative to the first electromagnetic matching element, which is detected by the first position sensor, so as to adjust a magnetic force applied to the second electromagnetic matching element.

In one embodiment, the projector lens assembly further includes a first metal piece disposed on the housing, and the first metal piece and the second electromagnetic mating piece have a magnetic attraction force.

In one embodiment, the projector lens assembly further includes a first rolling member, and the first support is connected to the housing in a rolling manner through the first rolling member.

In one embodiment, the housing is provided with a first guide portion, the first bracket is provided with a second guide portion opposite to the first guide portion, the first guide portion and/or the second guide portion extend along a straight line, and the first rolling member is accommodated in the first guide portion and the second guide portion at the same time.

In one embodiment, the housing includes a bottom case and a cover plate covering the bottom case, the mounting assembly and the first support are disposed on the bottom case, and the mounting assembly, the first support and the first lens group are spaced apart from the cover plate.

In one embodiment, the bottom casing has a light inlet, the light inlet is located on a side of the first lens assembly facing away from the second lens assembly, and the cover plate has a light outlet opposite to the reflector.

In a second aspect, the present invention further provides a projector including the projector lens assembly described in any one of the embodiments of the first aspect.

The first driving assembly drives the first support to drive the first lens group with the focusing function to be close to or far away from the reflecting piece to move so as to complete focusing, and therefore the focusing function and the correction function of the projection picture are achieved simultaneously.

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 other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is an exploded view of a projector lens assembly according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of the projector lens assembly of FIG. 1 with the cover plate removed;

FIG. 3 is a schematic view of the bottom housing of FIG. 1 and components thereon;

FIG. 4 is a top view of the projector lens assembly of FIG. 1;

FIG. 5 is a schematic cross-sectional view of the projector lens assembly of FIG. 4 taken along the A-A direction;

FIG. 6 is a schematic front view of the first electromagnetic fitting of FIG. 1;

FIG. 7 is a schematic cross-sectional view of the projector lens assembly of FIG. 4 taken along the direction B-B;

FIG. 8 is a schematic diagram of the circuit board of FIG. 1 and components thereon;

fig. 9 is a schematic diagram of a projector according to an embodiment of the invention.

Description of reference numerals:

11-a reflector; 12-a mounting assembly; 121-bottom shelf; 122-a top support; 13-a drive structure; 131-a bottom drive assembly; 1311-fifth electromagnetic counterpart; 1312-a sixth electromagnetic counterpart; 132-a top drive assembly; 1321-a seventh electromagnetic partner; 1322-eighth electromagnetic fitting piece; 14-a third metal piece; 15-a first rolling member; 16-a second rolling member; 17-a third position sensor; 18-a fourth position sensor;

21-a first drive assembly; 211-a first electromagnetic counterpart; 212-second electromagnetic counterpart; 2121-a first mating face; 2122-a second mating face; 2123-a third mating surface; 22-a first bracket; 222-a second guide; 23-a first lens group; 24-a first metal piece; 25-a first position sensor; 26-a first rolling member;

30-a housing; 301-a first guide; 302-a third guide; 31-a bottom shell; 311-light inlet; 312-a first mounting hole; 313-a second mounting hole; 314-a third mounting hole; 315-fourth mounting hole; 32-a cover plate; 321-a light outlet;

41-a second drive assembly; 411-a third electromagnetic counterpart; 412-a fourth electromagnetic counterpart; 42-a second stent; 422-a fourth guide; 43-a second lens group; 44 a second metal piece; 45-a second position sensor; 46-a second rolling member;

50-a circuit board;

100-a projector lens assembly; 200-galvanometer; 300-a prism; 400-DMD chip; 1000-projector.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Referring to fig. 1, an embodiment of the invention provides a projector lens assembly 100, and the projector lens assembly 100 may be applied to a desktop projector, a portable projector, a floor-type projector, a reflective projector, a single-function projector, a multifunctional projector, an intelligent projector, and other types of projectors, especially an ultra-short-focus projector. The projector lens assembly 100 includes a reflector 11, a mounting assembly 12, a driving structure 13, a first driving assembly 21, a first bracket 22, and a first lens group 23. A reflecting member 11 is disposed on the mounting assembly 12, and the reflecting member 11 is used for reflecting the projection picture to a target position. The driving structure 13 is used for driving the mounting assembly 12 to drive the reflector 11 to rotate so as to correct the projection picture at the target position. The first lens assembly 23 is disposed on the first bracket 22, and the first driving assembly 21 is configured to drive the first bracket 22 to drive the first lens assembly 23 to move close to or away from the reflector 11, so as to focus the projection image at the target position clearly.

Specifically, the reflector 11 is preferably an aspheric reflector, and the reflector 11 is fixed on the mounting assembly 12 by dispensing. The first lens group 23 is fixed on the first holder 22 by dispensing. The driving structure 13 may be a motor, an electromagnetic, a hydraulic driving, or the like, for driving the mounting assembly 12, so that the mounting assembly 12 drives the reflector 11 to rotate. Similarly, the first driving assembly 21 may drive the first support 22 by using a motor drive, an electromagnetic drive, a hydraulic drive, or the like, so that the first support 22 drives the first lens group 23 to move relative to the reflector 11. The mounting assembly 12 and the first bracket 22 are preferably made of a lightweight plastic. It can be understood that the first lens group 23 is a focusing group, and the first lens group 23 moves linearly during focusing to change the position of the projection focal plane, so that the projection image is focused clearly.

The driving structure 13 drives the mounting assembly 12 to drive the reflector 11 to rotate, so as to adjust the reflection direction of the reflector 11, so as to eliminate the distortion of the projection image, and the first driving assembly 21 drives the first support 22 to drive the first lens assembly 23 with the focusing function to move close to or away from the reflector 11, so as to complete focusing, thereby simultaneously realizing the focusing function and the correction function of the projection image.

In one embodiment, referring to fig. 2, the projector lens assembly 100 further includes a housing 30. The reflecting member 11, the mounting assembly 12, the first support 22 and the first lens group 23 are all arranged in the housing 30, the mounting assembly 12 is rotatably connected with the housing 30, and the first support 22 is movably connected with the housing 30. Specifically, the mounting assembly 12 may be rotated relative to the housing 30 by a sliding or rolling connection, and likewise, the first support 22 may be moved relative to the housing 30 by a sliding or rolling connection. By arranging the mounting assembly 12 to be rotatably connected with the housing 30, the first bracket 22 is movably connected with the housing 30, so as to realize the rotation of the reflector 11 and the movement of the first lens group 23, which is beneficial to simultaneously realizing the focusing function and the correction function of the projection picture.

In one embodiment, referring to fig. 1, the housing 30 includes a bottom shell 31 and a cover plate 32 covering the bottom shell 31. The mounting assembly 12 and the first bracket 22 are both disposed on the bottom case 31. The mounting assembly 12, the first support 22, and the first lens group 23 are all spaced apart from the cover plate 32. Specifically, bottom case 31 is preferably made of plastic, and cover plate 32 is preferably made of metal. In this embodiment, the cover plate 32 is connected to the bottom case 31 by screws. In other embodiments, the cover 32 and the bottom shell 31 may be connected by dispensing. Through setting up apron 32 for projector lens subassembly 100 has better structural stability, and apron 32 can protect the inner structure of shell well in falling or the impact event, and apron 32 also has better sealed and dirt-proof function simultaneously.

In one embodiment, referring to fig. 1, the projector lens assembly 100 further includes a second driving assembly 41, and a second bracket 42 and a second lens group 43 both disposed in the housing 30, wherein the second bracket 42 is movably connected to the housing 30. The second lens group 43 is disposed on the second support 42, and the second support 42 is disposed between the first support 22 and the reflective member 11. The second driving assembly 41 is used for driving the second bracket 42 to drive the second lens group 43 to move relative to the housing 30 so as to approach or depart from the reflector 11. The second lens group 43 is used to change the projection ratio of the projection screen. Specifically, the second lens group 43 may be fixed on the first bracket 22 by dispensing. The second driving assembly 41 can drive the second support 42 by adopting a motor driving mode, an electromagnetic driving mode, a hydraulic driving mode and the like, so that the second support 42 drives the second lens group 43 to move relative to the reflector 11. It is understood that the second lens group 43 is a zoom group, and the second lens group 43 moves linearly during zooming, so that the focal length can be changed uniformly, thereby enlarging or reducing the projection image, i.e. changing the projection ratio of the projection image, so as to adapt to screens with different sizes.

In the prior art, an ultra-short-focus projector only has an automatic focusing function, cannot achieve the effect of optical correction or variable projection ratio (zooming), and not to mention three functions of automatic focusing, optical correction and projection ratio change. The projector lens assembly 100 provided by the embodiment of the invention can simultaneously realize three functions of automatic focusing, optical correction and projection ratio change, is beneficial to the application of the projector lens assembly 100 on an ultra-short-focus projector, can enlarge and reduce a projection picture on the ultra-short-focus projector on the premise of not moving the position, corrects optical distortion caused by placement errors, and has clear focusing so as to be convenient for a user to watch.

In one embodiment, referring to fig. 1, the bottom casing 31 is formed with a light inlet 311, and the light inlet 311 is located at a side of the first lens assembly 23 opposite to the second lens assembly 43. The cover plate 32 is provided with a light outlet 321, and the light outlet 321 is opposite to the reflector 11. Specifically, the light enters the housing from the light inlet 311, sequentially passes through the first lens group 23 and the second lens group 43, reaches the reflector 11, is reflected by the reflector 11, and exits from the light outlet 321, so that the projection image is formed at the target position. The size and position of the light outlet 321 can be adjusted according to the required light path design of the reflector 11. The light inlet 311 and the light outlet 321 are arranged so that the reflector 11 projects a distortion-free and clear projection picture to a target position.

In one embodiment, referring to fig. 1 and 2, the first driving assembly 21 includes a first electromagnetic engaging element 211 and a second electromagnetic engaging element 212 disposed opposite to each other. First electromagnetic engaging element 211 is arranged on housing 30 and second electromagnetic engaging element 212 is arranged on first carrier 22. The first electromagnetic matching element 211 or the second electromagnetic matching element 212 is used for generating a magnetic field when being powered on, so that the second electromagnetic matching element 212 receives a magnetic force and drives the first bracket 22 and the first lens group 23 to move relative to the housing 30. Specifically, one of the first electromagnetic matching element 211 and the second electromagnetic matching element 212 is a coil for energization, and the other one is a magnet having magnetism. When the first electromagnetic engaging element 211 is a coil and is energized, the first electromagnetic engaging element 211 is energized to generate a current, and since the first electromagnetic engaging element 211 is located in the magnetic field generated by the second electromagnetic engaging element 212, the first electromagnetic engaging element 211 is subjected to an ampere force, so that the second electromagnetic engaging element 212 is subjected to a reaction force of the ampere force to drive the first bracket 22 to move relative to the housing 30. When the second electromagnetic engaging element 212 is a coil and is energized, the second electromagnetic engaging element 212 is energized to generate a current, and the second electromagnetic engaging element 212 is located in the magnetic field generated by the first electromagnetic engaging element 211, so that the first bracket 22 is moved relative to the housing 30 under the action of an ampere force applied to the second electromagnetic engaging element 212. The direction (approaching or departing) and the distance of movement of the first support 22 relative to the housing 30 can be controlled by controlling the current direction and the current magnitude of the current of the first electromagnetic matching element 211, so that the first support 22 moves to the position with clear focus.

In this embodiment, referring to fig. 2 and fig. 6, the first bracket 22 is provided with a first electromagnetic engaging element 211 and a second electromagnetic engaging element 212 on two opposite sides of the y-axis, the first electromagnetic engaging element 211 is a coil, and the second electromagnetic engaging element 212 is a magnet. Under the driving action of the two sets of first electromagnetic matching elements 211 and second electromagnetic matching elements 212, the first bracket 22 drives the first lens group 23 to move along the x-axis relative to the bottom case 31. The second electromagnetic matching element 212 includes a sub-magnet 212a and a sub-magnet 212b, and the sub-magnet 212a is fixed to the sub-magnet 212b by an adhesive 212 c. The sub-magnets 212a and 212b are magnetized in both directions, and the magnetization direction is the thickness direction (i.e., the y-axis direction). And the magnetizing directions of the sub-magnet 212a and the sub-magnet 212b are opposite, for example, the magnetizing direction of the sub-magnet 212a is a positive y-axis direction, and the magnetizing direction of the sub-magnet 212b is a negative y-axis direction, so that the loop coil currents in the two first electromagnetic mating parts 211 are mated, and the obtained ampere force and the reaction force thereof are parallel to the x-axis.

In the prior art, most of the traditional focusing transmission structures adopt a stepping motor and a gear to match with a straight line to move a lens barrel back and forth. The open-loop transmission structure has the defects of low transmission precision, low speed, large occupied space, idle rotation of a motor, gear sliding, and the like. The use of a high-precision motor can improve the transmission precision, but also causes a problem of high cost. According to the invention, the first electromagnetic matching piece 211 and the second electromagnetic matching piece 212 are arranged, the VCM is used for electromagnetic driving to achieve the compression of the whole size, the speed is high, and the problems of motor backlash, gear sliding and the like do not exist. In addition, the cost is lower compared with a high-precision motor.

In one embodiment, referring to fig. 1 to fig. 3, the projector lens assembly 100 further includes a first metal piece 24 disposed on the housing 30, and the first metal piece 24 and the second electromagnetic matching piece 212 have a magnetic attraction force. Specifically, the first metal component 24 is preferably a steel sheet, and is fixed on the bottom surface of the bottom case 31 by dispensing. The second electromagnetic engaging element 212 in this embodiment is a magnet, and the structural stability between the first bracket 22 and the housing 30 can be ensured by the magnetic attraction between the second electromagnetic engaging element 212 and the first metal member 24. In addition, the pre-applied magnetic attraction force can ensure that the first bracket 22 and the bottom shell 31 are stably connected in a rolling manner.

It is understood that, from a design point of view, the magnetic attraction between the first metal piece 24 and the second electromagnetic counterpart 212 can be adjusted by adjusting the area of the first metal piece 24 facing the second electromagnetic counterpart 212, the magnetic field strength of the second electromagnetic counterpart 212, and the distance between the first metal piece 24 and the second electromagnetic counterpart 212. In this embodiment, the magnetic attraction force is generally about 10 times the torque generated by gravity when the magnetic attraction force is disposed at 90 degrees. This ensures that the magnetic attraction can attract the first bracket 22 and the bottom case 31 together at any placing position.

In one embodiment, referring to fig. 4 to 6, the second electromagnetic matching component 212 includes a first mating surface 2121, a second mating surface 2122 and a third mating surface 2123 connected in sequence. The first mating surface 2121, the second mating surface 2122, and the third mating surface 2123 are configured to couple to the first bracket 22. The first mating surface 2121 lies in a plane perpendicular to the plane in which the third mating surface 2123 lies. The first mating surface 2121 and the third mating surface 2123 both form an angle with the second mating surface 2122 that is greater than 90 °. Specifically, the first mating surface 2121 is connected to one side of the second mating surface 2122, and the third mating surface 2123 is connected to the other side of the second mating surface 2122. The first bracket 22 is provided with a mounting groove, the second electromagnetic matching element 212 is accommodated in the mounting groove, and the first mating surface 2121, the second mating surface 2122 and the third mating surface 2123 of the second electromagnetic matching element 212 are attached to the side wall of the mounting groove. Preferably, the first mating surface 2121 and the third mating surface 2123 form an angle of 135 ° with the second mating surface 2122. In this embodiment, the second electromagnetic matching element 212 is a magnet, and the four corners of the second electromagnetic matching element 212 are provided with the first matching surface 2121 to the third matching surface 2123, so that the four corners of the second electromagnetic matching element 212 are all chamfered (oblique corners), the arrangement of the magnetic field and the coil is fully considered in the shape design, and on the premise that the magnitude of the driving ampere force is not affected basically, the space utilization rate is improved, more design spaces are created for the first bracket 22 and the housing 30, and thus, the overall structural strength and the design flexibility are enhanced.

In one embodiment, referring to fig. 1, the projector lens assembly 100 further includes a first position sensor 25. First position sensor 25 is used to detect the distance of movement of second electromagnetic engagement element 212 relative to first electromagnetic engagement element 211. Specifically, the first position sensor 25 may be a magnetic sensor such as a linear hall sensor or a tunnel magnetoresistive sensor (TMR sensor). By providing the first position sensor 25, the first position sensor 25 can determine the position change of the second electromagnetic matching element 212 according to the variation of the induced magnetic field strength, and further determine the position of the first bracket 22, so as to adjust the position of the first lens group 23, which is beneficial to better completing focusing.

In this embodiment, referring to fig. 1 to fig. 3, the first electromagnetic matching element 211 and the first position sensor 25 are disposed on two opposite sides of the first bracket 22, and the first metal element 24 is disposed at a position of the housing 30 corresponding to the first electromagnetic matching element 211, so as to ensure driving stability and transmission accuracy. In this embodiment, under the condition that the projector is placed at 90 degrees, the torque provided by the magnetic attraction is 10 times that formed by gravity. Therefore, the first bracket 22 and the bottom shell 31 can be adsorbed together at any placing position by the magnetic attraction force.

In one embodiment, referring to fig. 3 and 7, the projector lens assembly 100 further includes a first rolling member 26, and the first support 22 is connected to the housing 30 through the first rolling member 26. Specifically, the first rolling member 26 is located between the first bracket 22 and the housing 30. In this embodiment, the first rolling members 26 are steel balls, the number of the first rolling members is multiple, and the diameters of the first rolling members 26 are the same. Through setting up first rolling member 26, can effectively reduce the frictional force between first support 22 and casing 30, for sliding friction, the rolling friction that first rolling member 26 brought is littleer, is favorable to improving life, reduces energy loss and improves the transmission precision. In addition, due to the magnetic attraction between the first metal piece 24 and the second electromagnetic matching piece 212, the first rolling piece 26 is stably contacted with the first bracket 22 and the housing 30, and the friction mode between the first bracket 22 and the housing 30 can be ensured to be rolling friction instead of sliding friction.

In one embodiment, referring to fig. 3 and 7, the housing 30 is provided with a first guide portion 301, and the first bracket 22 is provided with a second guide portion 222 opposite to the first guide portion 301. The first guide portion 301 and/or the second guide portion 222 extend in a straight line, and the first roller 26 is accommodated in both the first guide portion 301 and the second guide portion 222. Specifically, the first guide portion 301 and the second guide portion 222 are both groove-shaped. The first guide portion 301 and the second guide portion 222 may both extend along a straight line, and the first rolling member 26 may be movable with respect to both the first bracket 22 and the housing 30. Alternatively, one of the first guide portion 301 and the second guide portion 222 extends along a straight line, for example, the first guide portion 301 extends along a straight line, the second guide portion 222 just accommodates the first rolling member 26, that is, the first rolling member 26 can roll in the first guide portion 301 and move relative to the housing 30, and the first rolling member 26 can roll in the second guide portion 222 but cannot move relative to the first bracket 22. By providing the first guide portion 301 and the second guide portion 222, the first guide portion 301 and the second guide portion 222 provide a linear track for the relative movement of the first bracket 22 and the housing 30, and also can limit the movement distance of the first bracket 22 relative to the housing 30. Moreover, the provision of the first guide portion 301 and the second guide portion 222 facilitates lubrication of the first rolling members 26 by the lubricant, which is advantageous in preventing the first rolling members 26 from being stuck or turning into sliding friction.

In this embodiment, the number of the first guide portions 301 is 4 and the specification is the same, the number of the second guide portions 222 is 4 and the specification is the same, and the 4 first guide portions 301 and the 4 second guide portions 222 all extend linearly in the y-axis direction. The 4 first guide portions 301 are arranged in an array of 2 × 2 on the y-axis and the x-axis, and a separation distance is provided between any two adjacent first guide portions 301.

In one embodiment, referring to fig. 1 and 8, the projector lens assembly 100 further includes a circuit board 50 disposed at the periphery of the housing 30. The first electromagnetic mating element 211 and the first position sensor 25 are electrically connected to the circuit board 50. Circuit board 50 is configured to control the current of first electromagnetic engaging element 211 according to the moving distance of second electromagnetic engaging element 212 relative to first electromagnetic engaging element 211 detected by first position sensor 25, so as to adjust the magnetic force applied to second electromagnetic engaging element 212. Specifically, first electromagnetic matching element 211 and first position sensor 25 are fixed on circuit board 50 through the point and are glued, and first electromagnetic matching element 211 forms the electricity through soldering tin and circuit board 50 and is connected, and first mounting hole 312 has been seted up to bottom shell 31, and circuit board 50 is preferred flexible circuit board, and circuit board 50 is through buckling and laminating in the periphery of bottom shell 31 for first electromagnetic matching element 211 stretches into first mounting hole 312 and is relative with second electromagnetic matching element 212. By providing the circuit board 50 so as to form a closed-loop feedback control, the first electromagnetic engaging element 211 and the second electromagnetic engaging element 212 in the present embodiment can achieve a more precise positioning transmission under the feedback control of the circuit board 50 and the first position sensor 25, compared to the stepping motor engaging gear transmission structure in the prior art.

In this embodiment, referring to fig. 1, the structure of the second driving assembly 41 can refer to the structure of the first driving assembly 21. Specifically, the second driving assembly 41 includes a third electromagnetic mating element 411 (refer to the first electromagnetic mating element 211) disposed on the bottom case 31 and a fourth electromagnetic mating element 412 (refer to the second electromagnetic mating element 212) disposed on the second bracket 42. Under the driving action of the first driving assembly 21 and the second driving assembly 41, the first bracket 22 and the second bracket 42 are close to or far away from the reflecting member 11 along the x-axis relative to the bottom case 31.

Referring to fig. 1 and 7, the structure of the second bracket 42 can be referred to the structure of the first bracket 22. Specifically, the bottom shell 31 is provided with a third guide portion 302 (refer to the first guide portion 301), and the second bracket 42 is provided with a fourth guide portion 422 (refer to the second guide portion 222). A second rolling member 46 (refer to the first rolling member 26) is disposed between the second bracket 42 and the bottom case 31, and the second rolling member 46 is accommodated in both the third guide portion 302 and the fourth guide portion 422. The bottom shell 31 is provided with a second metal part 44 (refer to the first metal part 24), the second metal part 44 and the fourth electromagnetic mating part 412 (magnet) have magnetic attraction, and under the action of the magnetic attraction, the second rolling part 46 can be well contacted with the second support 42 and the bottom shell 31, so that the structural stability is improved.

Referring to fig. 1 and 5, the driving structure 13 includes a bottom bracket 121 and a top bracket 122, the reflector 11 is mounted on the top bracket 122, the bottom bracket 121 is rotatably connected to the top bracket 122, and the bottom bracket 121 is rotatably connected to the bottom case 31. The drive structure 13 includes a bottom drive assembly 131 and a top drive assembly 132, the bottom drive assembly 131 being used for driving the bottom bracket 121 to rotate about the z-axis relative to the bottom shell 31, and the top drive assembly 132 being used for driving the top bracket 122 to rotate about the y-axis relative to the bottom bracket 121. Bottom drive assembly 131 includes a fifth electromagnetic mating element 1311 mounted on bottom housing 31 and a sixth electromagnetic mating element 1312 mounted on top bracket 122, where one of fifth electromagnetic mating element 1311 and sixth electromagnetic mating element 1312 is a magnet and the other is a coil, and preferably, fifth electromagnetic mating element 1311 is a coil and sixth electromagnetic mating element 1312 is a magnet. Fifth electromagnetic engagement element 1311 is energized such that sixth electromagnetic engagement element 1312 causes top bracket 122 and bottom bracket 121 to jointly rotate about the z-axis relative to bottom housing 31. The top driving assembly 132 includes a seventh electromagnetic mating element 1321 (refer to the first electromagnetic mating element 211) mounted on the bottom housing 31 and an eighth electromagnetic mating element 1322 (refer to the second electromagnetic mating element 212) mounted on the top bracket 122, wherein one of the seventh electromagnetic mating element 1321 and the eighth electromagnetic mating element 1322 is a magnet and the other one is a coil, preferably, the seventh electromagnetic mating element 1321 is a coil, and the eighth electromagnetic mating element 1322 is a magnet. Seventh electromagnetic engagement element 1321 is energized so that eighth electromagnetic engagement element 1322 causes top bracket 122 to rotate about the y-axis with respect to bottom bracket 121. Wherein, sixth electromagnetic mating elements 1312 and fifth electromagnetic mating elements 1311 are disposed on the z-axis, and eighth electromagnetic mating elements 1322 and seventh electromagnetic mating elements 1321 are both two in number and disposed on opposite sides of top bracket 122 on the y-axis. The shape structure of eighth electromagnetic engaging element 1322 may be referred to that of second electromagnetic engaging element 212, that is, eighth electromagnetic engaging element 1322 is a combination of two sub-magnets, whose magnetizing directions are y-axis directions and opposite to each other, such that the resultant ampere force and the reaction force are parallel to the x-axis. And, the four corners of the eighth electromagnetic counterpart 1322 are all chamfered corners (oblique corners), which can fully consider the arrangement of the magnetic field and the coil, and improve the space utilization rate on the premise of not influencing the magnitude of the driving ampere force, thereby creating more design spaces for the second support 42 and the housing 30, and further enhancing the overall structural strength and design flexibility. A third rolling member 15 is arranged between the top bracket 122 and the bottom bracket 121, and the top bracket 122 and the bottom bracket 121 are connected in a rotating manner on the y axis through the third rolling member 15. A fourth rolling member 16 is disposed between the bottom bracket 121 and the bottom shell 31, and the bottom bracket 121 and the bottom shell 31 are rotatably connected in the z-axis direction by the fourth rolling member 16. Because the friction mode is rolling friction, the friction force between the friction mode and the rolling friction mode can be effectively reduced, and the energy consumption is reduced.

Referring to fig. 1 and 8, the fifth electromagnetic mating element 1311, the seventh electromagnetic mating element 1321, the first electromagnetic mating element 211 and the third electromagnetic mating element 411 are disposed on the circuit board 50. The projector lens assembly 100 further includes a second position sensor 45, a third position sensor 17, and a fourth position sensor 18. The first position sensor 25, the second position sensor 45, the third position sensor 17 and the fourth position sensor 18 are disposed on the circuit board 50, and the second position sensor 45 is used for detecting the moving distance of the fourth electromagnetic matching element 412 relative to the bottom case 31 to obtain the position of the second bracket 42 relative to the bottom case 31. Third position sensor 17 is used for detecting the rotation angle of sixth electromagnetic matching element 1312 relative to bottom case 31 to obtain the position of reflecting element 11 relative to bottom case 31. Fourth position sensor 18 is used for detecting the rotation angle of eighth electromagnetic fitting 1322 with respect to bottom case 31 to obtain the position of reflecting member 11 with respect to bottom case 31. Wherein the second position sensor 45 is located in the inner bore of the third electromagnetic counterpart 411 (coil), the third position sensor 17 is located in the inner bore of the fifth electromagnetic counterpart 1311, and the fourth position sensor 18 is located in the inner bore of the seventh electromagnetic counterpart 1321.

Referring to fig. 1 and 3, bottom shell 31 further has a second mounting hole 313, a third mounting hole 314, and a fourth mounting hole 315. The third electromagnetic mating element 411 is received in the second mounting hole 313, the seventh electromagnetic mating element 1321 is received in the third mounting hole 314, and the fifth electromagnetic mating element 1311 is received in the fourth mounting hole 315. The projector lens assembly 100 further includes a third metal component 14, the third metal component 14 is disposed on a side of the circuit board 50 facing away from the bottom case 31, a magnetic attraction force is provided between the third metal component 14 and the sixth electromagnetic matching component 1312, and because the sixth electromagnetic matching component 1312 is fixed on the top bracket 122, under the action of the magnetic attraction force, the top bracket 122, the bottom bracket 121 and the bottom case 31 have better structural stability, which is beneficial for sufficient contact between the third rolling component 15 and the fourth rolling component 16.

Referring to fig. 9, an embodiment of the invention further provides a projector 1000, and the projector 1000 includes the projector lens assembly 100 according to the embodiment of the invention. Specifically, the projector 1000 may further include a galvanometer 200, a prism 300, and a DMD chip 400 arranged in order on an optical axis 1001. Wherein, the side of the galvanometer 200 back to the prism 300 is opposite to the first lens group 23. By adding the projector lens assembly 100 provided by the invention into the projector 1000, the projector 1000 can simultaneously realize focusing and optical correction functions, and the projector 1000 has higher transmission precision and smaller volume, thereby being beneficial to realizing the miniaturization design of ultra-short focus.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a projector lens subassembly, its characterized in that includes reflection piece, installation component, drive structure, first drive assembly, first support and first lens group, the reflection piece sets up on the installation component, the reflection piece is used for reflecting the projection picture to the target location, the drive structure is used for driving the installation component drives the reflection piece is rotatory, in order to rectify the projection picture of target location department, first lens group sets up on the first support, first drive assembly is used for driving first support drives first lens group is close to or keeps away from the reflection piece removes, so that the focus of the projection picture of target location department is clear.

2. The projector lens assembly of claim 1 wherein the projector lens assembly further comprises a housing, the reflector, the mounting assembly, the first bracket, and the first lens group being disposed within the housing, the mounting assembly being rotationally coupled to the housing, the first bracket being movably coupled to the housing.

3. The projector lens assembly of claim 2, wherein the projector lens assembly further comprises a second driving assembly, and a second bracket and a second lens group both disposed in the housing, the second bracket is movably connected to the housing, the second lens group is disposed on the second bracket, the second bracket is disposed between the first bracket and the reflector, the second driving assembly is configured to drive the second bracket to drive the second lens group to move relative to the housing to approach or separate from the reflector, and the second lens group is configured to change a throw ratio of the projection screen.

4. The projector lens assembly as recited in claim 2 or 3, wherein the first driving assembly comprises a first electromagnetic mating member and a second electromagnetic mating member which are oppositely arranged, the first electromagnetic mating member is arranged on the shell, and the second electromagnetic mating member is arranged on the first bracket;

the first electromagnetic matching piece or the second electromagnetic matching piece is used for being electrified to generate a magnetic field, so that the second electromagnetic matching piece receives magnetic field force and drives the first support and the first lens group to move relative to the shell.

5. The projector lens assembly of claim 4, wherein the projector lens assembly further comprises a first position sensor for detecting a distance of movement of the second electromagnetic fitting relative to the first electromagnetic fitting.

6. The projector lens assembly of claim 5, wherein the projector lens assembly further comprises a circuit board disposed at an outer periphery of the housing, the first electromagnetic matching element and the first position sensor are electrically connected to the circuit board, and the circuit board is configured to control a current of the first electromagnetic matching element according to a moving distance of the second electromagnetic matching element relative to the first electromagnetic matching element detected by the first position sensor, so as to adjust a magnetic force applied to the second electromagnetic matching element.

7. The projector lens assembly of claim 4, wherein the second electromagnetic mating member comprises a first mating surface, a second mating surface and a third mating surface which are connected in sequence, the first mating surface, the second mating surface and the third mating surface are used for being connected with the first bracket, a plane in which the first mating surface is located is perpendicular to a plane in which the third mating surface is located, and both the first mating surface and the third mating surface form an included angle larger than 90 degrees with the second mating surface.

8. The projector lens assembly of claim 4, wherein the projector lens assembly further comprises a first metallic element disposed on the housing, the first metallic element having a magnetic attraction with the second electromagnetic mating element.

9. The projector lens assembly of claim 2 wherein the projector lens assembly further comprises a first roller, the first bracket being in rolling connection with the housing via the first roller.

10. The lens assembly for a projector as claimed in claim 9, wherein the housing is provided with a first guide portion, the first bracket is provided with a second guide portion opposite to the first guide portion, the first guide portion and/or the second guide portion extend along a straight line, and the first rolling member is accommodated in both the first guide portion and the second guide portion.

11. The projector lens assembly of claim 3 wherein the housing includes a bottom shell and a cover plate covering the bottom shell, the mounting assembly and the first bracket being disposed on the bottom shell, the mounting assembly, the first bracket, and the first lens group being spaced apart from the cover plate.

12. The lens assembly of a projector as claimed in claim 11, wherein the bottom casing defines a light inlet, the light inlet is located on a side of the first lens assembly facing away from the second lens assembly, and the cover plate defines a light outlet, the light outlet is opposite to the reflector.

13. A projector lens assembly according to any one of claims 1 to 12, comprising the projector lens assembly.