Projection lens assembly

Abstract

The invention relates to the technical field of projection optical devices, in particular to a projection lens assembly, and the whole optical lens or a part of the optical lens can be adjusted in a tilting manner relative to an optical axis. The projection lens assembly can achieve movement of a projection picture in a side projection mode, the needed adjustment activity space is small, reduction of the size and implementation cost of a projector is facilitated, the resolution of the projection picture is improved through deflection of the lens during side projection, clear imaging of a large-range side projection angle can be achieved, and the projection effect is good. And viewing experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of projection optical devices, and in particular to a projection lens assembly. Background Art

[0002] At present, in order to move the image projected by the projector, the user usually adjusts the position of the projector to move the projected image or uses a built-in drive device to move the entire lens to move the projected image. It is troublesome for the user to move the projector, and it will trigger the function of trapezoidal correction of the image, resulting in a poor user experience. The built-in drive device has a complex structure and high cost. The built-in drive device used in the prior art is usually a shift module, which drives the entire lens to shift and adjust the direction perpendicular to the optical axis to achieve the movement of the projected image. However, the space required for the movable adjustment is large, which makes the volume of the entire projector larger and the implementation cost is high. Summary of the invention

[0003] The technical problem to be solved and the technical task proposed by the present invention are to improve the existing technology and provide a projection lens assembly to solve the problem that the lens structure required for moving the projection image in the current technology has a large movable adjustment space, resulting in an excessively large projection volume.

[0004] In order to solve the above technical problems, the technical solution of the present invention is:

[0005] A projection lens assembly includes a lens, a lens holding component and a base component, wherein the lens is held on the lens holding component, and the lens holding component is rotatably connected to the base component via a rotating bearing portion, wherein the rotation axis of the rotating bearing portion is a first direction perpendicular to the optical axis direction of the projection lens assembly, and a tilt adjustment mechanism for driving the lens holding component to tilt relative to the base component is also provided between the lens holding component and the base component, and the tilt adjustment mechanism is provided in an orientation perpendicular to the first direction. The projection lens assembly of the present invention can tilt and adjust the lens held on the lens holding component relative to the optical axis, thereby deflecting the projected light, and thus realizing the movement of the projection image in a side projection manner. Compared with the axis shift mode, the angle of deflection required for the lens during side projection is smaller, thereby requiring a smaller adjustment space, thereby facilitating the reduction of the volume and implementation cost of the projector, and improving the resolution of the projection image by deflecting the lens during side projection, thereby realizing clear imaging at a wide range of side projection angles and improving the viewing experience.

[0006] Furthermore, the rotating bearing part includes a roller and a pin, the pin is connected to the lens holding component, the roller is connected to the assembly hole opened on the base component, and the pin is rotatably connected to the roller. The structure is simple, the implementation is convenient, and the rotation stability is good.

[0007] Furthermore, the outer wall of the roller is provided with a conical surface, and the assembly hole is provided with a conical portion that matches the conical surface. The conical surface and the conical portion cooperate to achieve automatic centering, thereby improving installation accuracy and ensuring more precise and stable deflection adjustment; or the roller and the assembly hole thread cooperate to adjust the lens retaining member along the rotation axis of the rotating bearing part, that is, the lens can be driven to move in a direction perpendicular to the optical axis, thereby realizing eccentricity adjustment and flexibly meeting the needs.

[0008] Furthermore, the tilt adjustment mechanism includes a guide portion and a guide groove. The base component is provided with a guide groove whose length direction is along the optical axis direction. The guide portion is connected to the lens holding component. The guide portion moves along the guide groove to tilt the lens holding component. The structure is simple and easy to implement. The guide portion moves along the guide groove to drive the lens holding component to rotate around the rotating bearing part. The stability is good, and the accuracy of the tilt adjustment is ensured.

[0009] Furthermore, the tilt adjustment mechanism further includes a control member, the control member is slidably connected to the base member, a driving groove inclined relative to the optical axis direction is provided on the control member, the guide part is slidably matched with the driving groove, and the control member slides relative to the base member to drive the guide part to move along the guide groove through the driving groove. The structure is simple, the movement of the control member is converted into the movement of the guide part along the guide groove, and the operation and control are easy.

[0010] Furthermore, the control component is driven by a driving mechanism to further improve the convenience of operation.

[0011] Furthermore, the driving mechanism includes a lever connected to the control member to facilitate manual operation; or the driving mechanism includes a motor, and the control member is provided with a gear part. The motor is connected to the gear part to drive the control member to move, without manual operation, and has a high degree of automation.

[0012] Furthermore, the base member is a cylindrical member, the lens holding member is inserted into the base member, and the control member is a cylindrical member, which is rotatably sleeved and connected to the base member along the circumference of the base member. The structure is simple and compact, occupies little space, and has good stability.

[0013] Furthermore, the driving groove satisfies the relationship k=180*sinθ / (α*π), where k is the slope of the driving groove, θ is the preset maximum tilt angle of the lens holding member, and α is the angle range covered by the driving groove in the rotation circumferential direction. When the lens held on the lens holding member is tilted, the projection screen can be shifted. The preset maximum tilt angle of the lens holding member is related to the supported center offset angle of the projection screen. The adjustment stroke of the driving groove needs to meet the preset maximum tilt angle requirement of the lens holding member, thereby ensuring that the set center offset angle range of the projection screen can be supported, ensuring that the resolution of the projection screen can be improved while supporting side projection.

[0014] Furthermore, the outer wall of the base member is provided with a plurality of limiting rollers at intervals along the circumference thereof, the control member is provided with a sliding groove whose length direction is along the circumference of the base member, and the limiting rollers are slidably matched with the sliding groove, so as to ensure that the control member can accurately and stably rotate along the circumference of the base member, thereby ensuring the accuracy and stability of the tilt adjustment lens.

[0015] Furthermore, the lens and the lens holding member are combined to form the entire optical lens; or the lens held on the lens holding member is a single lens or a lens group in the optical lens, and the base member is the lens barrel of the entire optical lens. When side projection is performed, the entire optical lens can be tilted or a part of the optical lens can be tilted. Both structures can realize side projection to move the projection picture, and improve the resolution of the projection picture when side projection is performed.

[0016] Compared with the prior art, the present invention has the advantages of:

[0017] The projection lens assembly described in the present invention can adjust the entire optical lens or a part of the optical lens by tilting relative to the optical axis, and can realize the movement of the projection picture in a side projection manner. The required adjustment space is small, which is beneficial to reducing the size and implementation cost of the projector. When side projection is performed, the resolution of the projection picture is improved by deflecting the lens, and clear imaging can be achieved in a wide range of side projection angles, thereby improving the viewing experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a cross-sectional structure of a projection lens assembly along a first direction of the present invention;

[0019] Figure 2 is a schematic diagram of a cross-sectional structure of a projection lens assembly of the present invention perpendicular to a first direction;

[0020] Figure 3 for Figure 1 A schematic diagram of the exploded structure of the projection lens assembly shown;

[0021] Figure 4 A structural schematic diagram of a rotating bearing part;

[0022] Figure 5 is another structural schematic diagram of a rotating bearing part;

[0023] Figure 6 It is another structural schematic diagram of the rotating bearing part;

[0024] Figure 7 is a schematic cross-sectional structure diagram of another projection lens assembly of the present invention along a first direction;

[0025] Figure 8 is a schematic diagram of a cross-sectional structure of another projection lens assembly of the present invention that is perpendicular to a first direction;

[0026] Fig. 9 is a side cross-sectional schematic diagram of another tilt adjustment mechanism of a projection lens assembly of the present invention;

[0027] Fig.10 for Fig. 9 A perspective schematic diagram of the tilt adjustment mechanism shown;

[0028] Fig.11 The present invention is a schematic diagram of the cross-sectional structure of a projection lens assembly.

[0029] In the figure:

[0030] Lens 1, lens holding component 2, base component 3, rotating bearing part 4, roller 41, pin 42, guiding part 51, guide groove 52, control component 53, driving groove 54, limiting roller 55, sliding groove 56, lever 61, motor 62, gear part 63, rotating part 71, eccentric part 72, limiting groove 73, adjusting column assembly 8, component one 81, component two 82 and component three 83. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] A projection lens assembly disclosed in an embodiment of the present invention can realize the movement of the projection picture, and the required adjustment space is small, which is conducive to reducing the volume and implementation cost of the projector, and can achieve clear imaging in a wide range of side projection angles, thereby improving the viewing experience.

[0033] Embodiment 1

[0034] like Figures 1 to 3As shown, a projection lens assembly mainly includes a lens 1, a lens holding component 2 and a base component 3. The lens 1 is held on the lens holding component 2. The lens holding component 2 is rotatably connected to the base component 3 via a rotating bearing part 4. The rotation axis of the rotating bearing part 4 is a first direction perpendicular to the optical axis direction of the projection lens assembly. A tilt adjustment mechanism is also provided between the lens holding component 2 and the base component 3 for driving the lens holding component 2 to tilt relative to the base component 3. The tilt adjustment mechanism is provided in an orientation perpendicular to the first direction.

[0035] In this embodiment, the lens 1 mounted on the lens holding member 2 is only a single lens, the lens 1 is a part of the entire optical lens, the base member 3 is the lens barrel of the entire optical lens, and the remaining lenses in the optical lens are mounted and connected to the base member 3, so that a part of the lenses in the optical lens are fixed and unadjustable relative to the optical axis, while the lens 1 mounted on the lens holding member 2 is adjustable relative to the optical axis, so that the lens 1 held on the lens holding member 2 can be tilted relative to the optical axis to deflect the projected light, and then the projection image can be moved in a side projection manner. Compared with the projection slide door moved in an axis-shift manner, the angle of deflection required for the lens 1 during side projection is smaller, so the required adjustment space is smaller, which is conducive to reducing the volume and implementation cost of the projector. Of course, the lens 1 mounted on the lens holding member 2 can also be a plurality of lenses, specifically a lens group in the optical lens, which can also be tilted relative to the optical axis to achieve side projection, and can improve the resolution of the projection image when performing side projection, and can achieve clear imaging at a wide range of side projection angles, thereby improving the viewing experience.

[0036] More specifically, the lens holding member 2 is an annular support member, the center of which is a through hole for light to pass through, and the lens 1 is placed on the lens holding member 2 and fixed on the lens holding member 2 by a pressure ring, which has a simple structure and is easy to assemble and disassemble for maintenance. In this embodiment, the base member 3 is the lens barrel of the entire optical lens, so that the base member 3 is a cylindrical member as a whole, and the annular lens holding member 2 is inserted into the inside of the base member 3. The two sides of the lens holding member 2 in the diameter direction are respectively connected to the base member 3 by a rotating bearing part 4, and the rotation stability is good. The rotation axis of the rotating bearing part 4 passes through the optical axis, which ensures that the lens 1 will only tilt relative to the optical axis when the tilt adjustment is performed, avoiding the eccentricity of the lens 1 relative to the optical axis (that is, the lens 1 has a lateral displacement relative to the optical axis in a direction perpendicular to the optical axis), improving the accuracy of the tilt adjustment, and avoiding the occurrence of eccentricity and affecting the projection adjustment effect.

[0037] Further, such as Figures 4 to 6As shown, the rotating bearing part 4 includes a roller 41 and a pin 42. The pin 42 is specifically a screw connected to the side of the outer periphery of the lens holding member 2. The roller 41 is connected to the assembly hole opened on the wall surface of the base member 3. The pin 42 is rotatably connected with the roller 41. The roller 41 is cylindrical. The pin 42 passes through the through hole of the roller 41 and is screwed to the lens holding member 2. The structure is simple and the assembly is convenient. Figure 4 As shown, the outer circumference of the roller 41 is a cylindrical surface, and the assembly hole on the base member 3 is a matching cylindrical hole, which has a simple structure and is easy to assemble. Figure 5 As shown, the outer peripheral wall of the roller 41 is provided with a conical surface, and correspondingly, the assembly hole is provided with a conical portion that matches the conical surface, so that when the roller 41 is installed in the assembly hole, the conical surface and the conical portion cooperate to perform automatic centering, thereby improving the installation accuracy and stability, and ensuring that the rotation axis formed by the rotating bearing part 4 is accurately perpendicular to the optical axis and passes through the optical axis. Figure 6 As shown, the outer wall surface of the roller 41 is provided with a thread, and the roller 41 is threadedly connected to the assembly hole. The through hole of the roller 41 is provided with a step portion to limit the pin 42 along the axial direction. The roller 41 is screwed to drive the pin 42 to move along the first direction, that is, the lens holding component 2 can be adjusted along the first direction. The rotating bearing portion 4 is used as a rotating connection portion to support the lens holding component 2, so that the lens holding component 2 has a rotational freedom to rotate along the first direction relative to the base component 3. At the same time, the rotating bearing portion 4 can also be used to move the lens holding component 2 along the first direction, which is convenient for precise assembly of the lens, ensuring that the lens 1 on the lens holding component 2 can be coaxial with the optical axis, avoiding the occurrence of eccentricity, and ensuring the accuracy of tilt adjustment during side projection.

[0038] like Figure 2 As shown, the tilt adjustment mechanism includes a guide portion 51 and a guide groove 52. The guide groove 52 is provided on the wall surface of the base member 3, and the guide groove 52 is provided along the optical axis in the length direction. Since the tilt adjustment mechanism is provided in an orientation perpendicular to the first direction, that is, the distribution orientation of the guide groove 52 and the rotating bearing portion 4 in the circumferential direction of the base member 3 differs by 90°, the guide portion 51 is connected and provided on the lens holding member 2, and correspondingly, the distribution orientation of the guide portion 51 and the rotating bearing portion 4 in the circumferential direction of the lens holding member 2 differs by 90°. The guide portion 51 moves along the guide groove 52, thereby driving the lens holding member 2 to rotate relative to the base member 3 along the rotation axis of the rotating bearing portion 4, that is, driving the lens 1 provided on the lens holding member 2 to tilt relative to the optical axis. In this embodiment, the tilt adjustment mechanism is provided with only one group, that is, only one guide groove 52 is provided on the base member 3, and the lens holding member 2 can be driven to deflect by driving the guide portion 51 along the guide groove 52 on one side of the lens holding member 2.

[0039] Furthermore, in order to improve the convenience and stability of driving the lens holding component 2 to deflect, a control component 53 is also provided. The control component 53 is a cylindrical component, and the control component 53 is sleeved on the periphery of the base component 3. The control component 53 is rotatably connected to the base component 3 along the circumference of the base component 3, that is, the control component 53 can slide relative to the base component 3 in a direction perpendicular to the optical axis. A driving groove 54 is provided on the control component 53, and the driving groove 54 is inclined relative to the optical axis direction. The guide portion 51 is slidably matched with the driving groove 54, so that when the control member 53 slides relative to the base component 3 along the circumference of the base component 3, the driving groove 54 drives the guide portion 51 to move along the guide groove 52, that is, when the control member 53 rotates relative to the base component 3, it realizes driving the lens holding component 2 to tilt.

[0040] In order to ensure that the control member 53 rotates accurately and stably along the circumferential direction of the base member 3, three limiting rollers 55 are arranged on the outer wall of the base member 3 at intervals along the circumference of the base member 3, and the control member 53 is provided with a sliding groove 56 along the circumference of the base member 3 in the length direction. Correspondingly, the sliding groove 56 is distributed with three circumferential intervals to slide with one limiting roller 55 respectively, and the two side edges of the sliding groove 56 are in contact with the limiting roller 55 to achieve limitation in the axial direction of the base member 3, ensuring that the control member 53 rotates accurately and stably along the circumferential direction of the base member 3, thereby ensuring that the control member 53 can accurately and stably drive the guide part 51 to move along the guide groove 52 to achieve the tilt adjustment of the lens holding member 2.

[0041] The angle at which the lens 1 on the lens holding member 2 can be tilted relative to the optical axis is determined by the stroke length of the guide groove 52, and the tilt angle of the lens 1 is related to the center offset angle of the projection image during side projection. Based on Sham's law, when the extended surfaces of the three planes, the subject plane, the image plane, and the lens plane, intersect in a straight line, a fully clear image can be obtained, and a great depth of field can be obtained. For the projection system, the light valve (DMD chip, LCD panel, etc.) corresponds to the image plane, the screen corresponds to the subject plane, and the optical lens corresponds to the lens plane, that is, when the extended surfaces of the image plane of the light valve, the screen, and the optical lens plane intersect in a straight line, a clear projection image can be obtained. Therefore, when side projection is performed, the plane of the projection lens assembly is tilted and adjusted according to the tilt angle between the lens plane and the screen to achieve the conditions of Sham's law to obtain a clear projection image, wherein tilting and adjusting one lens in the optical lens can achieve adjustment of the plane of the entire optical lens.

[0042] Preferably, the lens or lens group with the smallest absolute value of magnification in the optical lens is placed on the lens holding member 2 to form a component that can be tilted and adjusted relative to the optical axis. The smaller the absolute value of the magnification, the smaller the angle that needs to be rotated and adjusted during side projection, which can reduce the activity space required for tilt adjustment, which is conducive to improving the compactness of the structure and reducing the difficulty of designing the driving mechanism. For a single lens or lens group, its magnification is

[0043]

[0044] Wherein, n is the refractive index on the object side, n' is the refractive index on the image side, for a single lens or a lens group, both sides of which are air, then n and n' are the same, l' is the image distance, l is the object distance, for a single lens or a lens group, the object distance is the distance from the image of the screen obtained by all lenses on the magnification side of the lens to the lens, and the image distance is the distance from the image of the light valve obtained by all lenses on the reduction side of the lens to the lens. In this embodiment, the lens 1 closest to the reduction side is placed on the lens holding member 2 to form a tiltable and adjustable component. Assuming that the projector supports a projection screen center offset of ±30°, the angle at which the lens 1 needs to be tilted relative to the optical axis is converted to ±1.8°, and then the travel of the guide portion 51 moving in one direction along the guide groove 52 is calculated to be 1.82mm, so that the overall travel length of the guide groove 52 is at least 3.64mm. In order to meet the requirements of the optical side projection screen, the travel length is set to 4.0mm, and the circumferential angle range covered by the driving groove 54 on the control member 53 is set to 60°. That is, the control component 53 can rotate 60° relative to the base component 3 to drive the lens 1 to rotate from -1.8° to +1.8° relative to the optical axis, and then the slope of the driving groove 54 can be calculated to be 0.0175. The slope of the driving groove 54 specifically refers to the slope of the cross section of the driving groove 54 relative to the vertical optical axis when the cylindrical control component 53 is unfolded into a plane. The driving groove 54 satisfies the relationship k=180*sinθ / (α*π), wherein k is the slope of the driving groove 54, θ is the preset maximum tilt angle of the lens holding component 2, and α is the angle range covered by the driving groove 54 in the rotation circumferential direction.

[0045] Furthermore, in this embodiment, if Figure 2 and Figure 3 As shown, the control member 53 is driven by a driving mechanism. Specifically, the driving mechanism is a lever 61 connected to the control member 53. The lever 61 is threadedly connected to the control member 53, and is convenient and simple to assemble and disassemble. By manually pushing the lever 61 to rotate the control member 53 relative to the base member 3, the lens 1 can be driven to tilt and adjust relative to the optical axis. The structure is simple and easy to operate.

[0046] Since the lens holding component 2 is a movable part relative to the base component 3, there is a risk of dust ingress, and a dustproof part can be provided between the lens holding component 2 and the base component 3. The dustproof part can be foam or Mylar sheet.

[0047] Embodiment 2

[0048] like Figure 7 and Figure 8 As shown, the difference from the first embodiment is that the lens 1 and the lens holding member 2 are combined to form the entire optical lens, so that the lens holding member 2 is the lens barrel of the entire optical lens, and the base member 3 is a flange member for carrying and connecting the entire optical lens. In this embodiment, the entire optical lens is tilted and adjusted to perform side projection to move the projection picture. Also based on Sham's law, when performing side projection, the entire optical lens is tilted and adjusted to make the extended planes of the image plane of the light valve, the screen and the plane of the optical lens intersect in a straight line, thereby obtaining a clear projection picture.

[0049] Furthermore, the driving mechanism adopted in this embodiment includes a motor 62, which is fixedly arranged on the base member 3. The control member 53 is provided with a gear portion 63, and the output shaft of the motor 62 is provided with a gear that is transmission-connected to the gear portion 63, so that when the motor 62 is working, it drives the control member 53 to rotate relative to the base member 3, thereby driving the entire optical lens to tilt relative to the optical axis.

[0050] In this embodiment, assuming that the projector supports a projection screen center offset of ±40°, the angle at which the optical lens needs to be tilted relative to the optical axis is converted to ±1.65°, and then the stroke of the guide portion 51 moving in one direction along the guide groove 52 is calculated to be 1.72 mm, so that the overall stroke length of the guide groove 52 is at least 3.44 mm. In order to meet the requirements of the optical side projection screen, the stroke length is set to 3.5 mm, and the circumferential angle range covered by the drive groove 54 on the control member 53 is set to 60°, that is, the control member 53 rotates 60° relative to the base member 3 to drive the optical lens to rotate from -1.65° to +1.65° relative to the optical axis, and then the slope of the drive groove 54 can be calculated to be 0.0174.

[0051] Since the entire optical lens needs to be tilted, there is a risk of dust entering between the end side of the optical lens and the projector body. A dustproof rubber sleeve can be installed on the end side of the optical lens, which can elastically deform with the movement of the optical lens to ensure good sealing and dustproof effect.

[0052] Embodiment 3

[0053] like Fig. 9 and Fig.10As shown, different from the tilt adjustment mechanism used in the first two embodiments, the tilt adjustment mechanism of this embodiment includes a rotating member 71 rotatably connected to the base member 3, the rotation axis of the rotating member 71 is perpendicular to the optical axis and perpendicular to the first direction, the rotating member 71 is specifically arranged in an orientation perpendicular to the first direction, that is, the distribution orientation of the rotating member 71 and the rotating bearing part 4 in the circumferential direction of the base member 3 differs by 90°, the rotating member 71 is provided with an eccentric portion 72 eccentric to the rotation axis of the rotating member 71, and the lens holding member 2 is provided with an eccentric portion 72 eccentric to the rotation axis of the rotating member 71. The rotating member 71 is rotated to drive the lens holding member 2 to rotate around the first direction by cooperating with the limiting groove 73. Specifically, the limiting groove 73 is a groove along the circumference of the lens holding member 2. The two side edges of the limiting groove 73 along the optical axis direction are in contact with the eccentric portion 72 for limiting, so that the rotating member 71 can adjust the position of the eccentric portion 72 in the optical axis direction during rotation, and then drive the side of the lens holding member 2 to move in the optical axis direction through the eccentric portion 72, and finally drive the lens holding member 2 to tilt around the rotating bearing portion 4. The tilt adjustment mechanism described in this embodiment has a simple structure, can omit the control member 53 sleeved on the outer circumference of the base member 3, and the structure is more streamlined and compact.

[0054] like Fig.11As shown, the eccentric adjustment and the tilt adjustment can be integrated into one. Specifically, the lens 1 is set on the lens holding member 2, and the lens holding member 2 is connected to the base member 3 through the adjustment column assembly 8. A plurality of adjustment column assemblies 8 can be arranged along the circumferential direction between the lens holding member 2 and the base member 3. The adjustment column assembly 8 includes a component 1 81, a component 2 82 and a component 3 83. The component 1 81 can be rotatably connected to a connection hole opened on the wall surface of the base member 3. The rotation direction of the component 1 81 is along the radial direction of the base member 3, that is, the rotation axis of the component 1 81 is perpendicular to the optical axis. An adjustment hole 61 is provided axially along the radial direction of the base component 3 on component one 81, and component two 82 is rotatably set in the adjustment hole 61. The axis of the adjustment hole 61 is eccentric to the rotation axis of component one 81, so that the rotation axis of component two 82 is also perpendicular to the optical axis. Component three 83 is connected to the lens holding component 2, and component two 82 and component three 83 are threadedly connected to form a radial screw adjustment pair. Screwing component two 82 can drive component three 83 to move radially, and then component three 83 will drive the lens 1 to radially offset so that the lens 1 can be adjusted eccentrically perpendicular to the optical axis. Moreover, since the axis of the adjustment hole 61 is eccentric to the rotation axis of the component 1 81, it is equivalent to forming an eccentric wheel structure. When the component 1 81 is rotated, the height of the component 2 82 can be changed. The component 3 83 and the component 2 82 are in a screw connection relationship. The component 3 83 will change its height together with the component 2 82, thereby realizing the height adjustment of the connection between the lens holding member 2 and the component 3 83, so that the lens holding member 2 can be tilted relative to the axial direction of the base member 3, that is, the tilt adjustment of the lens 1 is realized. In this embodiment, the eccentric adjustment and the tilt adjustment are integrated into one, with high integration, compact structure, and small space occupation, but poor adjustability, small adjustment range, and poor adjustment accuracy. When performing eccentric adjustment or tilt adjustment, it is easy to cause linkage, that is, when adjusting the tilt, it is easy to cause eccentricity, which affects the adjustment accuracy. In the first to third embodiments, the eccentric adjustment and the tilt adjustment are separated and independent, and can be adjusted without being affected by each other, effectively improving the adjustment accuracy, ensuring the projection effect after adjustment, and better improving the resolution of the projection picture.

[0055] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A projection lens assembly, characterized in that: The invention comprises a lens (1), a lens holding component (2) and a base component (3), wherein the lens (1) is held on the lens holding component (2), and the lens holding component (2) is rotatably connected to the base component (3) via a rotatable bearing part (4), wherein the axial rotation direction of the rotatable bearing part (4) is a first direction perpendicular to the optical axis direction of the projection lens assembly, and a tilt adjustment mechanism for driving the lens holding component (2) to tilt relative to the base component (3) is also provided between the lens holding component (2) and the base component (3), and the tilt adjustment mechanism is provided in an orientation perpendicular to the first direction.

2. The projection lens assembly according to claim 1, wherein: The rotating bearing part (4) comprises a roller (41) and a pin (42), wherein the pin (42) is connected to the lens holding component (2), the roller (41) is connected to an assembly hole opened on the base component (3), and the pin (42) is connected to the roller (41) in a rotationally matched manner.

3. The projection lens assembly according to claim 2, wherein: The outer wall of the roller (41) is provided with a tapered surface, and the assembly hole is provided with a tapered portion that matches the tapered surface; or the roller (41) is threadedly matched with the assembly hole to adjust the lens holding member (2) along the first direction.

4. The projection lens assembly according to any one of claims 1 to 3, characterized in that: The tilt adjustment mechanism comprises a guide portion (51) and a guide groove (52); the base member (3) is provided with a guide groove (52) whose length direction is along the optical axis direction; the guide portion (51) is connected to the lens holding member (2); the guide portion (51) moves along the guide groove (52) to tilt the lens holding member (2).

5. The projection lens assembly according to claim 4, wherein: The tilt adjustment mechanism also includes a control member (53), which is slidably connected to the base member (3), and is provided with a driving groove (54) inclined relative to the optical axis direction. The guide portion (51) is slidably matched with the driving groove (54), and the control member (53) slides relative to the base member (3) to drive the guide portion (51) to move along the guide groove (52) through the driving groove (54).

6. The projection lens assembly according to claim 5, wherein: The control component (53) is driven to move by a driving mechanism.

7. The projection lens assembly according to claim 6, wherein: The driving mechanism comprises a lever (61) connected to the control member (53); or the driving mechanism comprises a motor (62), the control member (53) is provided with a gear portion (63), and the motor (62) is transmission-connected to the gear portion (63) to drive the control member (53) to move.

8. The projection lens assembly according to claim 5, wherein: The base member (3) is a cylindrical member, the lens holding member (2) is inserted into the base member (3), and the control member (53) is a cylindrical member and is rotatably sleeved and connected to the base member (3) along the circumference of the base member (3).

9. The projection lens assembly according to claim 5, wherein: The driving groove (54) satisfies the relationship k=180*sinθ / (α*π), wherein k is the slope of the driving groove (54), θ is the preset maximum tilting angle of the lens holding member (2), and α is the angle range covered by the driving groove (54) in the circumferential direction of rotation when the control member (53) is connected to the base member (3) along the circumferential rotation of the base member (3).

10. The projection lens assembly according to claim 8, wherein: The outer wall of the base member (3) is provided with a plurality of limiting rollers (55) at intervals along its circumference, and the control member (53) is provided with a sliding groove (56) whose length direction is along the circumference of the base member (3), and the limiting rollers (55) are slidably matched with the sliding groove (56).

11. The projection lens assembly according to claim 1, wherein: The lens (1) and the lens holding component (2) are combined to form an entire optical lens; alternatively, the lens (1) held on the lens holding component (2) is a single lens or a lens group in the optical lens, and the base component (3) is a lens barrel of the entire optical lens.

Images