CN116125735A

CN116125735A - Lens adjusting device and projection display equipment

Info

Publication number: CN116125735A
Application number: CN202310404885.0A
Authority: CN
Inventors: 王志煌
Original assignee: Shenzhen Shengyang Optical Technology Co ltd
Current assignee: Shenzhen Shengyang Optical Technology Co ltd
Priority date: 2023-04-17
Filing date: 2023-04-17
Publication date: 2023-05-16
Anticipated expiration: 2043-04-17
Also published as: CN116125735B

Abstract

The application discloses a lens adjusting device and projection display equipment relates to the technical field of optical display, and can improve and even avoid the problems of unclear imaging picture and imaging picture distortion. Wherein, lens adjusting device includes: the front group fixing seat is provided with an accommodating space; the reflector system is accommodated in the accommodating space; the relay optical system is positioned outside the accommodating space and is used for projecting the imaging light beam to the direction of the imaging surface through the reflector system; the relay optical system comprises a lens barrel and a plurality of optical lenses arranged in the lens barrel; and the eccentric adjusting mechanism is used for connecting the lens cone with the front group fixing seat, and adjusting the relative position between the lens cone and the front group fixing seat under the action of external force so as to adjust the eccentric degree between the relay optical system and the reflecting mirror system.

Description

Lens adjusting device and projection display equipment

Technical Field

The present disclosure relates to the field of optical display technologies, and in particular, to a lens adjusting device and a projection display device.

Background

With the continuous development of optical display technology, projection display devices have been widely used in the fields of home use, education, office use, etc., wherein ultra-short-focus projection display devices can project large-sized pictures in the case of short-distance projection.

In the related art, an ultra-short focal projection display apparatus generally includes: a relay optical system and a mirror system arranged along an optical axis of the imaging light beam, a focusing device, and an eccentric adjustment mechanism. The relay optical system is used for receiving the imaging light beam generated by the image light source generating device and passing through the imaging light beam, and the reflector system is used for projecting the imaging light beam emitted by the relay optical system to the imaging surface direction. The relay optical system comprises a lens barrel and a plurality of lenses arranged in the lens barrel, wherein at least one lens is fixed on the focusing device, and when the focusing device rotates, the relative position of the lens fixed on the lens barrel can be adjusted so as to realize the function of adjusting the focal length of the relay optical system.

However, in the above-mentioned ultra-short focal projection display device, due to poor precision of the assembly tolerance of the structural design of the lens barrel, the optical axis direction of the relay optical system is easily changed when the rotary focusing is performed, so that the definition of the picture displayed on the imaging surface is very easy to be poor, and even the picture is malformed due to the fact that the mirror system deviates from the axis.

Disclosure of Invention

In order to solve the above technical problems or at least partially solve the above technical problems, an embodiment of the present invention provides a lens adjusting device and a projection display device.

In a first aspect, an embodiment of the present application provides a lens adjustment apparatus, including:

the front group fixing seat is provided with an accommodating space;

a mirror system accommodated in the accommodation space;

the relay optical system is positioned outside the accommodating space and is used for projecting an imaging light beam to the direction of an imaging surface through the reflector system; the relay optical system comprises a lens barrel and a plurality of optical lenses arranged in the lens barrel; the method comprises the steps of,

and the eccentric adjusting mechanism is used for connecting the lens barrel with the front group fixing seat, and adjusting the relative position between the lens barrel and the front group fixing seat under the action of external force so as to adjust the eccentric degree between the relay optical system and the reflecting mirror system.

In some embodiments, the eccentric adjustment mechanism comprises: the adjusting screw is used for driving the lens barrel to move under the action of external force so as to adjust the eccentric degree between the relay optical system and the reflector system.

In some embodiments, the adjusting screws have a plurality of, at least two of the adjusting screws are symmetrically disposed about a preset center plane of the relay optical system.

In some embodiments, the adjusting screw has at least three, at least three of the adjusting screws are respectively located at three vertices of a preset triangle.

In some embodiments, the adjustment screw comprises: the first screws are multiple, and the first screws and the second screws are distributed in a nonlinear mode.

In some embodiments, the second screw has a threaded section, a non-threaded section, and a head, the non-threaded section being connected between the threaded section and the head;

the lens cone is provided with a limiting hole, the non-threaded section movably penetrates through the limiting hole, and the non-threaded section can be in contact with the hole wall of the limiting hole.

In some embodiments, the eccentric adjustment mechanism further comprises: the first elastic piece is propped between the lens cone and the second screw;

wherein, in adjusting the eccentric degree between the relay optical system and the mirror system by the first screw, the first elastic member is used to be compressed to absorb the error amount in the adjustment.

In some embodiments, the eccentric adjustment mechanism further comprises: one end of the second elastic piece is propped against the front group fixing seat, and the other end of the second elastic piece is propped against the lens cone;

Wherein, in adjusting the eccentric degree between the relay optical system and the mirror system by the first screw, the second elastic member is used to be compressed to absorb the error amount in the adjustment.

In some embodiments, the mirror system comprises: the reflector is fixedly arranged on the reflector fixing seat, and the reflector fixing seat is in sliding connection with the front group fixing seat.

In some embodiments, the mirror system further comprises an optical refractive element located between the mirror and the relay optical system.

In some embodiments, the optical refraction element is fixedly disposed on the reflector fixing seat, and the reflector is a reflective film layer structure attached to a side of the optical refraction element away from the optical lens.

In some embodiments, the lens adjustment device further comprises a focus adjustment mechanism comprising: the guide rail is respectively connected with the front group fixing seat and the reflector fixing seat and is used for guiding the reflector fixing seat to slide relative to the front group fixing seat along the optical axis direction of the relay optical system.

In some embodiments, the guide rail has a plurality of guide rails, and at least two guide rails are respectively located at two opposite sides of the reflector fixing seat.

In some embodiments, the focus adjustment mechanism comprises: the driving piece is installed on the front group fixing seat, and is connected with the reflector fixing seat through the driving piece so as to drive the reflector fixing seat to move relative to the front group fixing seat.

In some embodiments, the mirror comprises: a reflector body and a connecting edge connected to the edge of the reflector body;

the reflector fixing seat is provided with a dispensing groove, the dispensing groove is correspondingly arranged with the connecting edge, so that adhesive entering from the dispensing groove can contact with the connecting edge, and the connecting edge is bonded with the reflector fixing seat.

In some embodiments, the mirror system further comprises: the baffle plate is fixedly connected with the reflector fixing seat through a fastener, so that the connecting edge is clamped between the baffle plate and the reflector fixing seat.

In a second aspect, embodiments of the present application provide a projection display device, including: a lens adjustment device according to any preceding claim.

In the lens adjusting device and the projection display device provided by the embodiment of the application, the lens barrel can be connected with the front group fixing seat through the arrangement of the eccentric adjusting mechanism, the relative position between the lens barrel and the front group fixing seat is adjusted under the action of external force, so that the eccentric degree between the relay optical system and the reflecting mirror system is adjusted, the problem of axial deviation caused by factors such as assembly tolerance of the lens barrel or optical focusing is favorably solved, imaging light beams of the relay optical system can be projected in an effective imaging area of the reflecting mirror system, and the problems of unclear imaging pictures and imaging picture distortion are improved and even avoided.

Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.

Drawings

FIG. 1 is a schematic diagram of a relay optical system, a reflector system and an image light source generating device according to an exemplary embodiment;

fig. 2 is a schematic perspective view of a lens adjusting device according to an exemplary embodiment;

FIG. 3 is a schematic diagram of a mirror system according to an exemplary embodiment;

FIG. 4 is a side view of a lens adjustment apparatus according to an exemplary embodiment;

FIG. 5 is a schematic cross-sectional view of a lens adjustment apparatus according to an exemplary embodiment along the direction A-A in FIG. 4;

fig. 6 is a partially exploded view of a lens adjusting apparatus according to an exemplary embodiment;

fig. 7 is a front view of a lens adjustment apparatus according to an exemplary embodiment;

FIG. 8 is a schematic cross-sectional view of a lens adjustment apparatus according to an exemplary embodiment along the direction B-B in FIG. 7;

FIG. 9 is a schematic diagram of a partial structure of a reflector holder, a front group holder and a guide rail according to an exemplary embodiment;

FIG. 10 is a schematic view of a partial structure of a reflector holder and guide rail according to an exemplary embodiment;

FIG. 11 is a schematic diagram showing an exploded structure of a reflector holder, a front group holder and a focus adjustment mechanism according to an exemplary embodiment;

FIG. 12 is a schematic view illustrating a structure of a reflector system according to an exemplary embodiment when a baffle and a reflector holder are disassembled;

fig. 13 is a schematic diagram showing the relative positions of the optical refractive element and the relay optical system in the mirror system according to an exemplary embodiment.

Reference numerals illustrate: 1-an image light source generating device; a 2-relay optical system; 21-a lens barrel; 22-an optical lens; 211-a lens barrel body; 212-a flange plate; 21 A-A limiting hole; a 3-mirror system; 31-a mirror; 311—a mirror body; 312-connecting edges; a 32-mirror mount; 321-dispensing grooves; 33-baffle plates; 34-an optical refractive element; 341-a first optical surface; 342-a second optical surface; 4-front group fixing seats; 40-accommodating space; 5-a focal length adjustment mechanism; 51-a guide rail; 52-a driving member; 6-an eccentric adjusting mechanism; 61-adjusting screws; 611-a first screw; 612-a second screw; 6121-head; 6122-non-threaded segments; 6123-thread segments; 613-a first resilient member; 614-second elastic member.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the imaging process of the ultra-short focal projection display device, the optical lens is a structure for gathering light so that the photosensitive original can obtain clear images, and is a factor affecting the definition of projection imaging. In the related art, adjusting the sharpness based on the optical lens generally adopts a stretching structure to drive the optical lens to move on the axis for focusing, or drives the optical lens to move on the axis for focusing by a driving motor. However, due to factors such as poor precision of structural members such as a lens barrel for mounting the optical lens, the system including the optical lens has assembly tolerance, which causes a problem that the optical lens is easily deviated from the axis in the focusing process, that is, a larger flatness error is generated, so that the definition of part of imaging pictures is poor and even the imaging pictures are distorted.

In order to overcome the above-mentioned problems, the present embodiment provides a lens adjusting device, in which an eccentric adjusting mechanism is provided, the eccentric adjusting mechanism is used for adjusting a relative position between a lens barrel and a front group fixing seat under an external force, so as to adjust an eccentric degree between a relay optical system and a mirror system, so as to improve a flatness error and an axis deviation phenomenon of the relay optical system caused by factors such as assembly tolerance through angle adjustment, so that an imaging beam passing through the relay optical system is projected in an effective imaging area of the mirror system, and thereby, the problems of unclear imaging pictures and picture distortion are improved and even avoided.

The structure, functions and implementation procedures of the lens adjusting device of the embodiment of the present application are described below by way of example with reference to the accompanying drawings.

It will be appreciated that: as for the lens adjustment apparatus, a portion not described in the present embodiment may be set by a conventional setting or according to actual needs.

Referring to fig. 1 to 2, a lens adjusting apparatus provided in an embodiment of the present application includes: a relay optical system 2, a front group fixing base 4, a reflecting mirror system 3 and an eccentric adjusting mechanism 6.

Wherein, the front group fixing seat 4 is provided with an accommodating space 40; the mirror system 3 is accommodated in the accommodating space 40 and is connected with the front group fixing seat 4, and it is worth mentioning that the connection relationship between the mirror system 3 and the front group fixing seat 4 is sliding connection or fixed connection, wherein, the sliding connection means that the mirror system 3 can make relative linear reciprocating motion on the front group fixing seat 4 along a specified direction after the mirror system 3 is connected with the front group fixing seat 4, and the fixed connection means that the relative position between the mirror system and the front group fixing seat is basically fixed after the mirror system is connected with the front group fixing seat; the relay optical system 2 is located outside the accommodating space 40 and is used for projecting the imaging light beam to the direction of the imaging surface through the reflector system 3; the relay optical system 2 includes a lens barrel 21 and a plurality of optical lenses 22 disposed in the lens barrel 21. The eccentric adjusting mechanism 6 is connected with the lens barrel 21 and the front group fixing seat 4, and the eccentric adjusting mechanism 6 is used for adjusting the relative position between the lens barrel 21 and the front group fixing seat 4 under the action of external force so as to adjust the eccentric degree between the relay optical system 2 and the reflector system 3. Wherein the relay optical system 2 is located between the mirror system 3 and the image light source generating device 1 for generating an image light beam. The relay optical system 2 is configured to receive the imaging light beam generated by the image light source generating device 1, and pass through the imaging light beam after being refracted by the plurality of optical lenses 22. The mirror system 3 is configured to reflect and project the imaging light beam passing through the relay optical system 2 toward the imaging plane. The front group fixing base 4 is used for mounting the relay optical system 2 and the mirror system 3, and fixing the lens adjusting device into the ultra-short focal projection display apparatus.

For convenience of description, the direction of the relay optical system 2 toward the image light source generating device 1 will be referred to as the direction indicated by the arrow Y in the figure; the direction of the relay optical system 2 toward the mirror system 3 is set to the rear; the relay optical system 2 is set to be downward (or bottom) in the direction toward the ground; taking the direction of the relay optical system 2 away from the ground as the upward (or top) direction as indicated by an arrow Z in the figure; the remaining two directions are left and right, respectively, wherein the right side is the direction indicated by the arrow X in the figure.

Referring to fig. 3, the mirror system 3 includes: the mirror 31 and the mirror holder 32. In the mirror system 3, the mirror 31 is fixedly disposed on the mirror fixing base 32, and specifically, the mirror 31 may be fixed on the mirror fixing base 32 by adhesion, clamping, or the like. Illustratively, the mirror mount 32 may be a hollow structure, with the hollow portion of the mirror mount 32 being configured for the imaging beam to pass therethrough and then be incident on the mirror 31. The mirror 31 may be mounted to one end of the mirror mount 32. The mirror 31 is substantially semicircular, and accordingly, one end of the mirror holder 32 for mounting the mirror 31 is also substantially semicircular.

With continued reference to fig. 2 and 3, in some embodiments, the mirror holder 32 may be slidably coupled to the front group holder 4. The front group fixing seat 4 is connected with an eccentric adjusting mechanism 6, and the eccentric adjusting mechanism 6 is also connected with the relay optical system 2. The eccentric adjustment mechanism 6 connects the front group fixing base 4 with the relay optical system 2, and the mirror fixing base 32 is slidably connected to the front group fixing base 4, so that the relative distance between the mirror fixing base 32 and the relay lens of the relay optical system 2 along the optical axis changes during the sliding process of the mirror fixing base 32 relative to the front group fixing base 4, thereby realizing the focusing function. It should be noted that, the above structure realizes the optical focusing function on the mirror system 3 side, and the focusing function is not required to be realized by moving the relative position of the optical lens 22 in the relay optical system 2, so that the assembly accuracy of the optical lens 22 on the lens barrel 21 is advantageously ensured, the shift of the optical axis direction of the relay optical system 2 is not caused in the focusing process, and the mirror system 3 makes the linear translational motion along the specific direction in the focusing process, so that the deviation of the axis center between the relay optical system 2 and the mirror system 3 due to the focusing is advantageously avoided, the phenomenon of picture deformity is better suppressed, and the definition and the imaging quality of the picture displayed on the imaging surface are effectively ensured.

Of course, in other embodiments, the mirror fixing base is fixedly connected with the front group fixing base, and the focusing device is disposed at the side of the relay optical system, and the optical lens of the relay optical system is adjusted to move relatively by the focusing device to realize the focusing function.

The eccentric adjusting mechanism 6 movably connects the lens barrel 21 with the reflector system 3, so that the eccentric adjusting mechanism 6 can drive the lens barrel 21 to move relative to the front group fixing seat 4 and the reflector system 3 under the action of external force, so that the relative position between the lens barrel 21 and the front group fixing seat 4 is changed, the relative inclination angle of the connecting part between the lens barrel 21 and the front group fixing seat 4 is adjusted, and the position of the lens barrel 21 relative to the reflector system 3 is swung to change the inclination degree between the lens barrel 21 and the reflector system 3, so that the position of the optical axis of the relay optical system 2 is changed, and the eccentric degree between the relay optical system 2 and the reflector system 3 is adjusted; in actual use, the eccentric adjustment mechanism 6 can reduce the degree of axial misalignment between the relay optical system 2 and the mirror system 3, and in an ideal adjustment state, the relay optical system 2 and the mirror system 3 can be adjusted to a state of coaxial arrangement, and by adjusting the angle, errors in flatness due to factors such as assembly tolerance and the like can be absorbed, and the phenomenon of axial misalignment can be improved, and after adjustment, the imaging light beam passing through the relay optical system 2 can be projected into the effective imaging area of the mirror system 3.

Illustratively, the eccentric adjusting mechanism 6 can swing the lens barrel 21 relative to the mirror system 3 under the action of an external force to adjust the position of the projection area of the imaging light beam passing through the relay optical system 2 on the mirror 31 until the projection area is located within the effective imaging area of the mirror 31. In other embodiments, the eccentric adjustment mechanism 6 may also drive the mirror system 3 to move relative to the relay optical system 2, so as to adjust the angle of the mirror system 3 relative to the relay optical system 2.

Referring to fig. 2 to 5, in some examples, the eccentric adjustment mechanism 6 includes: the adjusting screw 61, the adjusting screw 61 is inserted into the lens barrel 21 of the relay optical system 2 and can be screwed with the front group fixing base 4. The adjusting screw 61 is located in a non-axial region of the relay optical system 2, so that the lens barrel 21 can be driven to swing when the adjusting screw 61 is screwed.

When the adjusting screw 61 is screwed to move towards or away from the front group fixing seat 4 under the action of external force, the lens barrel 21 can be driven to swing correspondingly, that is, the lens barrel 21 is driven to adjust the pitching angle and the left and right angles by taking the axis as the origin, so as to adjust the eccentricity between the relay optical system 2 and the reflecting mirror system 3 until the flatness requirement is met, and the imaging light beam passing through the relay optical system 2 is projected in the effective imaging area of the reflecting mirror system 3. After the adjustment is in place, the external force is removed, the adjustment screw 61 is stationary and fixes the lens barrel 21 with the front group fixing base 4.

In this example, the adjusting screw 61 can connect the lens barrel 21 with the front group fixing base 4, and can adjust the eccentricity between the relay optical system 2 and the mirror system 3 so that the imaging beam passing through the relay optical system 2 is projected in the effective imaging area of the mirror system 3, so that the structure of the lens adjusting device is simpler, the cost is lower, and the miniaturization is facilitated.

In other examples, the eccentric adjustment mechanism 6 may also include an adjusting rod, which may be fixedly connected with the relay optical system 2, and the adjusting rod may also be inserted into the front group fixing seat 4, and a damping member is disposed between the adjusting rod and the front group fixing seat 4. Under the action of external force, the adjusting rod can overcome the damping action of the damping piece and slide along the direction towards or away from the front group fixing seat 4. After the relay optical system 2 is adjusted in place, after the external force is removed, the adjusting rod can be reliably connected with the front group fixing seat 4 under the damping action of the damping piece, so that the relay optical system 2 is fixed with the reflector fixing seat 32.

The lens adjusting device provided by the embodiment is provided with a relay optical system 2, a front group fixing seat 4, a reflecting mirror system 3 and an eccentric adjusting mechanism 6; the relay optical system 2 and the mirror system 3 are arranged along the optical axis of the imaging light beam; the mirror system 3 includes: the reflector 31 and the reflector fixing seat 32, the reflector 31 is fixedly arranged on the reflector fixing seat 32, and the reflector fixing seat 32 is in sliding connection with the front group fixing seat 4; the eccentric adjusting mechanism 6 is connected with the relay optical system 2 and the front group fixing seat 4, and the eccentric adjusting mechanism 6 is used for adjusting the eccentric degree between the relay optical system 2 and the reflector system 3 under the action of external force, so that the imaging light beam passing through the relay optical system 2 is projected in the effective imaging area of the reflector system 3. In this way, the degree of eccentricity between the relay optical system 2 and the mirror system 3 can be adjusted to improve the flatness error of the relay optical system 2 and the axis misalignment phenomenon caused by factors such as assembly tolerance through angle adjustment until the imaging beam passing through the relay optical system 2 is projected into the effective imaging area of the mirror system 3, thereby improving or even avoiding the problems of unclear imaging picture and distortion of the imaging picture.

Referring to fig. 5 to 8, and with continued reference to fig. 2, in some embodiments, the lens barrel 21 includes a lens barrel main body 211 and a flange 212 disposed at an outer periphery of the lens barrel main body 211, and a plurality of optical lenses 22 are disposed inside the lens barrel main body 211, and the adjusting screw 61 can connect the lens barrel main body 211 with the front group fixing base 4 through the flange 212.

It should be noted that the positioning of the adjustment screw 61 on the flange 212 is not limited, for example, in some embodiments, the flange 212 may have an inner edge near the central axis thereof and contacting the outer periphery of the barrel body, and an outer edge remote from the central axis thereof and spaced from the outer periphery of the barrel body, and the adjustment screw 61 may be located at the outer edge of the flange 212. Thus, the interference of other structural members in the relay optical system 2 by the adjusting screw 61 can be avoided, the relay optical system 2 can be driven to have relatively large adjustment amount by the movement of the adjusting screw 61, and the rapid adjustment function of the eccentricity of the relay optical system 2 can be realized in the actual eccentricity adjustment process. Of course, in other embodiments, it is also possible that the adjusting screw is located at the inner edge of the flange, and compared with the adjusting screw disposed at the outer edge of the flange, the movement of the adjusting screw can drive the relay optical system to have a relatively smaller adjustment amount, so as to implement a finer fine adjustment function for the eccentricity of the lens; in addition, in other embodiments, the adjusting screw may be partially disposed at the outer edge of the flange, and another portion may be disposed at the inner edge of the flange, in the actual eccentric degree adjusting process, the eccentric degree of the relay optical system may be quickly adjusted by the adjusting screw disposed at the outer edge of the flange, and then the eccentric degree of the relay optical system may be finely adjusted by the adjusting screw disposed at the inner edge of the flange to achieve final adjustment.

In some examples, the adjustment screws 61 may be multiple, and the multiple adjustment screws 61 may be spaced along the edge of the flange 212. By providing a plurality of adjusting screws 61, not only the connection reliability of the lens barrel 21 and the front group fixing base 4 can be improved, but also the eccentricity of the relay optical system 2 relative to the mirror system 3 can be rapidly adjusted by screwing one or more of the adjusting screws 61, which is beneficial to improving the accuracy and the operation efficiency of adjustment. In other examples, the adjustment screw 61 may have one, and the adjustment screw 61 may be disposed near one of the top corners of the flange 212. For convenience of description, the present embodiment will be described taking the case where the adjustment screw 61 has a plurality of adjustment screws.

In some examples, among the plurality of adjustment screws 61, at least two adjustment screws 61 are symmetrically disposed with respect to a preset center plane of the relay optical system 2. As shown in fig. 5, the preset center plane may be a vertical center plane, wherein two adjustment screws 61 are symmetrically disposed about the vertical center plane.

Illustratively, the adjusting screw 61 has at least three, and the at least three adjusting screws 61 are respectively located at three vertices of the preset triangle. Specifically, among the adjustment screws 61 located at three vertexes of the preset triangle, the adjustment screws 61 located at two vertexes may be symmetrically disposed with respect to the vertical center plane, and the adjustment screw 61 located at the other vertex may be located on the vertical center plane.

Of course, in other examples, in order to avoid other structural members, the adjusting screw 61 may be disposed asymmetrically, and the specific disposition position of the adjusting screw 61 may be set according to actual needs.

With continued reference to fig. 5 and 6, in some examples, the adjustment screw 61 includes: a first screw 611. The first screw 611 is used to move under an external force to adjust the eccentricity of the relay optical system 2 with respect to the mirror system 3. The adjustment screw 61 may also include a second screw 612. The second screw 612 is movably matched with the flange 212 so as not to interfere with the movement of the flange 212 under the driving of the first screw 611.

The first screws 611 are provided with a plurality of first screws 611 and second screws 612, which are distributed in a nonlinear manner. For example, the plurality of first screws 611 and the plurality of second screws 612 may be positioned at three vertices of a predetermined triangle. For example, as shown in fig. 5, the first screws 611 may have two, and the two first screws 611 may be symmetrically disposed about a vertical center plane; the second screw 612 may have one, and the second screw 612 may be located on a vertical center plane.

The second screw 612 has a threaded section 6123, a non-threaded section 6122, and a head 6121. The threaded section 6123 can be screwed with the front group fixing seat 4, and the unthreaded section 6122 is connected between the threaded section 6123 and the head 6121. The flange 212 of the lens barrel 21 is provided with a limiting hole 21a, the unthreaded section 6122 movably penetrates through the limiting hole 21a, and the unthreaded section 6122 can be in contact with the hole wall of the limiting hole 21 a.

The aperture of the limiting hole 21a is larger than the space of the non-threaded section 6122, and in the process that the first screw 611 drives the flange 212 to swing or the like, the limiting hole 21a can also move relative to the non-threaded section 6122 of the second screw 612, so that the non-threaded section 6122 of the second screw 612 is prevented from interfering with the movement of the flange 212. And, part of the surface of the non-threaded section 6122 of the second screw 612 can be in contact with the hole wall of the limit hole 21a, so as to play a limit role on the flange 212 in motion, and ensure stability in the adjustment process.

The first screw 611 may include a head portion and a shaft portion, the head portion is connected to one end of the shaft portion, and the other end of the shaft portion may pass through the flange 212 and be screwed with the front group fixing base 4. The stem may be threaded entirely or may be threaded in a partial region to enable threaded engagement with the mirror mount 32.

In the present embodiment, the angle between the relay optical system 2 and the mirror system 3 can be adjusted by screwing, for example, screwing or unscrewing the first screw 611. As shown in fig. 5, the amounts of screws 611 on the left and right sides may be the same or different, and the angle of the relay optical system 2 with respect to the mirror system 3 may be adjusted by controlling the amounts of screws 611 on the left and right sides, respectively, until the imaging light beam passing through the relay optical system 2 is projected into the effective imaging area of the mirror system 3. The screwing directions of the first screws 611 on the left and right sides may be the same, and for example, the first screws 611 on the left and right sides may be screwed or the first screws 611 on the left and right sides may be unscrewed. The screwing direction of the first screws 611 on the left and right sides may be different, for example, one of the first screws 611 may be screwed and the other first screw 611 may be unscrewed.

In addition, during the process of screwing the first screw 611, the X value distance between the relay optical system 2 and the mirror system 3 may be adjusted to achieve fine adjustment of the focal length. For example, the X-value distance between the relay optical system and the mirror system 3 may be adjusted to be small during tightening of the first screw 611, and the X-value distance between the relay optical system and the mirror system 3 may be adjusted to be large during loosening of the first screw 611. Wherein the X value distance is the distance between the flange 212 of the barrel 21 and the mirror 31 of the mirror system 3. Optionally, during screwing the first screw 611, the maximum stroke of the first screw 611 in the direction parallel to the optical axis does not exceed 2.5 mm, so as to avoid that the adjustment amount is too large to affect the optical parameters.

With continued reference to fig. 6-8, in some embodiments, the eccentric adjustment mechanism 6 further includes: the first elastic member 613, the first elastic member 613 is disposed between the flange 212 and the head 6121 of the second screw 612. The first elastic member 613 is configured to urge the flange 212 in a direction away from the head 6121 of the second screw 612, that is, urge the flange 212 in a direction toward the front group fixing base 4. In this way, in the process of adjusting the eccentric degree between the relay optical system 2 and the mirror system 3 by the first screw 611, the first elastic member 613 can be compressed to absorb the error amount in the adjustment process, so as to avoid the excessive adjustment amount, thereby improving the accuracy and efficiency of adjustment.

In some examples, the first resilient member 613 is a spring that is sleeved outside the unthreaded section 6122 of the second screw 612. In other examples, the first elastic member 613 may be a rubber column abutted between the head of the second screw 612 and the flange 212, or the first elastic member 613 may be a spring plate, which is fixed on the flange 212 and abuts against the head of the second screw 612.

In some embodiments, the eccentric adjustment mechanism 6 further comprises: the second elastic member 614, one end of the second elastic member 614 abuts against the front group fixing base 4, and the other end of the second elastic member 614 abuts against the flange 212 of the lens barrel 21. The second elastic element 614 is used for urging the flange 212 in a direction away from the front group holder 4. In this way, in adjusting the degree of eccentricity between the relay optical system 2 and the mirror system 3 by the first screw 611, the second elastic member 614 is used to be compressed to absorb the error amount in the adjustment process so as not to excessively increase the adjustment amount.

In some examples, the second resilient member 614 is a spring that is sleeved outside the shaft of the first screw 611. In other examples, the second elastic member 614 may be a rubber column abutted between the front group fixing base 4 and the flange 212, or the second elastic member 614 may be a spring plate, which is fixed on the flange 212 and abuts against the front group fixing base 4.

The specific parameters of the first elastic member 613 and the second elastic member 614 may be set according to actual needs, and the embodiment is not specifically limited herein.

In the process of tightening the first screw 611 to adjust, the first screw 611 drives the upper portion of the flange 212 to swing towards the front group fixing seat 4 and compress the second elastic element 614, the second elastic element 614 can absorb the error amount in the adjusting process to play a role of slowing down the swing amplitude of the upper portion of the flange 212, meanwhile, the lower portion of the flange 212 swings along the direction away from the front group fixing seat 4 and compresses the first elastic element 613, the first elastic element 613 applies a force towards the front group fixing seat 4 to the lower portion of the flange 212, the error amount in the adjusting process is absorbed to limit the swing amplitude of the lower portion of the flange 212, and thus, by controlling the tightening amount of the first screw 611 and under the action of the second elastic element 614 and the first elastic element 613, the flatness of the flange 212 (i.e. the flatness of the relay optical system 2) can be quickly adjusted to meet the requirement and kept, so that the imaging light beam passing through the relay optical system 2 is projected in the effective imaging area of the mirror system 3.

In the process of unscrewing the first screw 611 to perform adjustment, the head of the first screw 611 moves in the direction away from the mirror fixing seat 32, under the action of the second elastic member 614, the upper portion of the flange 212 swings in the direction away from the front group fixing seat 4, and simultaneously, the lower portion of the flange 212 swings in the direction toward the front group fixing seat 4 under the action of the first elastic member 613, so that the flatness of the flange 212 (i.e., the flatness of the relay optical system 2) can be quickly adjusted to meet and maintained under the action of the error amount in the process of adjusting the second elastic member 614 and the first elastic member 613 by controlling the unscrewing amount of the first screw 611, so that the imaging light beam passing through the relay optical system 2 is projected into the effective imaging area of the mirror system 3.

In this embodiment, by providing the first elastic member 613 and the second elastic member 614, the first elastic member 613 and the second elastic member 614 can absorb the error amount in the adjustment process, and the excessive adjustment amount of the relay optical system 2 can be avoided, thereby improving the accuracy and the operation convenience in the adjustment process.

In other embodiments, the second elastic member 614 can also be abutted between the front group fixing base 4 and the head of the first screw 611. In the process of tightening the first screw 611 for adjustment, the second elastic member 614 plays a role in slowing down the swing amplitude of the upper portion of the flange 212, and after adjustment is in place, the flatness of the relay optical system 2 will be kept to meet the requirement under the action of the second elastic member 614 and the first elasticity. In the process of loosening the first screw 611 to adjust, the first screw 611 can drive the upper part of the flange 212 fixedly connected with the first screw 611 to swing, and after the adjustment is in place, the flatness of the relay optical system 2 can be kept to meet the requirement under the action of the first elastic piece 613 and the second elastic piece 614. In the above-described process of tightening or loosening the first screw 611, the first elastic member 613 and the second elastic member 614 can absorb the error amount in the adjustment process, thereby improving the accuracy and the operation convenience in the adjustment process.

Referring to fig. 9 to 11, and referring to fig. 2, in some embodiments, the lens adjustment device may further include a focal length adjustment mechanism 5, and the mirror fixing base 32 is slidably connected to the front group fixing base 4 through the focal length adjustment mechanism 5, so that the mirror system 3 can slide relative to the front group fixing base 4 to enable focal length adjustment. Specifically, the focal length adjusting mechanism 5 is slidably connected with one of the reflector fixing seat 32 and the front group fixing seat 4, and is fixedly connected with the other one of the reflector fixing seat 32 and the front group fixing seat 4, so that under the driving of the focal length adjusting mechanism 5, the reflector fixing seat 32 and the front group fixing seat 4 can slide relatively, and focal length adjustment is realized. The focal length adjusting mechanism 5 may be manually adjusted or electrically adjusted.

In some examples, the focal length adjustment mechanism 5 includes: the guide rail 51 is connected to the front group fixing base 4 and the mirror fixing base 32, and the guide rail 51 is used for guiding the mirror fixing base 32 to slide relative to the front group fixing base 4 along the optical axis direction.

For example, the guide rail 51 may be fixedly connected to the front group fixing base 4, and the guide rail 51 is slidably connected to the mirror fixing base 32. For example, the guide rail 51 may have a cylindrical shape, the guide rail 51 may be fixedly connected to the front group fixing base 4 through a guide rail mounting seat, and the guide rail 51 is slidably matched with a sliding hole or a sliding groove of the mirror fixing base 32. Wherein, the guide rail mount pad can be provided with the fixed orifices, and guide rail 51 inserts in the fixed orifices in order to with guide rail mount pad fixed connection, guide rail mount pad pass through a plurality of fasteners and preceding crowd fixing base 4 fastening connection to with guide rail 51 and preceding crowd fixing base 4 fixed connection. The specific structure of the guide rail mounting seat is not limited herein, as long as the guide rail 51 can be fixedly connected with the front group fixing seat 4.

In other examples, the guide rail 51 may also be slidably engaged with the front group fixing base 4, and the guide rail 51 is fixedly connected with the mirror fixing base 32.

The guide rail 51 has a plurality of guide rails. The plurality of guide rails 51 are each provided to extend in the optical axis direction. In this way, in the process that the mirror fixing base 32 drives the mirror 31 to slide relative to the front group fixing base 4, the plurality of guide rails 51 are mutually matched, so that the shaking (or shaking) of the mirror fixing base 32 relative to the front group fixing base 4 in the sliding process can be reduced, the displacement error amount generated in the sliding process can be absorbed, and the larger deviation between the mirror fixing base 32 and the front group fixing base 4 is avoided, thereby avoiding the problems of shaking, unclear and even distortion of an imaging picture in the adjusting process.

In the exemplary embodiment, at least two guide rails 51 are disposed on opposite sides of the mirror holder 32 among the plurality of guide rails 51. For example, the guide rails 51 may have two, and the two guide rails 51 are located on the left and right sides of the mirror holder 32, respectively. For another example, the guide rails 51 may have three, two of which 51 are located at left and right sides of the mirror holder 32, respectively, and the other guide rail 51 may be located at an upper side or a lower side of the mirror holder 32. In addition, one or more guide rails 51 may be provided at the left and right sides of the guide rail 51 of the mirror 31, respectively. In other examples, the guide rail 51 may be provided with one, and the guide rail 51 may be located on the left or right side of the mirror holder 32. It will be appreciated that: the specific number and arrangement of the guide rails 51 are not limited thereto, and may be set according to actual needs in a specific implementation.

Optionally, when the guide rail 51 is slidably connected to the mirror fixing base 32, the guide rail 51 is slidably connected to the mirror fixing base 32 through a ball bearing, so as to reduce the resistance when the mirror fixing base 32 slides relative to the front group fixing base 4.

In this embodiment, the relative sliding between the mirror fixing base 32 and the front group fixing base 4 can be realized by electric control, so as to improve the automation degree of the lens adjusting device and save manpower.

In some examples, the focal length adjustment mechanism 5 may further include: a driving member 52 and a transmission member. The driving piece 52 is installed on the front group fixing seat 4, the driving piece is connected with the reflector fixing seat 32, and the driving piece 52 drives the reflector fixing seat 32 to move relative to the front group fixing seat 4 through the driving piece. The sliding condition of the mirror fixing base 32 relative to the front group fixing base 4 can be controlled by controlling the working state of the driving piece 52. In other examples, the driving member 52 may be mounted on the mirror mount 32, with the driving member being coupled to the front group mount 4.

The driving member 52 may be a motor, and an output end of the motor may be provided with a screw, where the screw is matched with a nut in the clamping member, and the clamping member is connected with the mirror fixing seat 32, so that the motor drives the clamping member and the mirror fixing seat 32 to slide along the guide rail 51 through the screw and the nut. The clamping piece is mainly used for fixing the nut and the reflector fixing seat 32, so that the nut can drive the reflector fixing seat 32 to synchronously move through the clamping piece when the motor drives the nut to linearly move through the lead screw. The specific structure of the clamping piece can be set according to actual needs, so long as the functions can be realized.

In other examples, the focal length adjusting mechanism 5 may further include an air cylinder, where a cylinder body of the air cylinder may be fixed to the front group fixing seat 4, and a piston rod of the air cylinder may be fixedly connected with the reflecting mirror 31, so as to drive the reflecting mirror fixing seat 32 to move relative to the front group fixing seat 4 through sliding of the piston rod relative to the air cylinder, so as to implement focal length adjustment. The air port of the cylinder body can be connected with an electric valve, and the movement condition of the empty box piston rod can be controlled by controlling the working state of the electric valve.

In other embodiments, the relative sliding between the mirror mount 32 and the front group mount 4 may also be achieved by manual control. Illustratively, the focus adjustment mechanism 5 may include a manual operator, which may be coupled to the mirror mount 32. For example, the manual operation member may be a hand wheel, which is connected to the mirror holder 32 by a worm gear structure. Thus, when the manual operation member is manually operated, the manual operation member can drive the mirror holder 32 to slide along the guide rail 51, thereby realizing focal length adjustment. The specific structure of the manual operation member may be set according to actual needs, and the embodiment is not specifically limited herein.

With continued reference to fig. 3, in some embodiments, the mirror 31 includes: the mirror body 311 has a connecting edge 312 connected to an edge of the mirror body 311. The mirror body 311 is used to participate in imaging. The connecting edge 312 is used to fix the mirror 31 to the mirror holder 32.

Referring to fig. 12, with continued reference to fig. 3, the mirror fixing base 32 is provided with a dispensing slot 321, and the dispensing slot 321 is disposed corresponding to the connecting edge 312, so that the adhesive entering from the dispensing slot 321 can contact the connecting edge 312 to adhere the connecting edge 312 to the mirror fixing base 32.

The dispensing grooves 321 may have a plurality of connection points between the reflector 31 and the reflector fixing base 32, so as to improve the mounting reliability of the reflector 31. After the reflector 31 is assembled with the reflector fixing seat 32, at least two of the dispensing grooves 321 can be symmetrically distributed about the vertical central line of the reflector 31, so that the mounting reliability of the reflector 31 can be improved, and the stress of the reflector 31 can be uniform.

In some examples, the number of connecting edges 312 is plural, and the plurality of connecting edges 312 can respectively correspond to the plurality of dispensing slots 321. Wherein, at least two connecting edges 312 may be symmetrically distributed about a vertical center line of the reflecting mirror 31. For example, the connecting sides 312 may have two, and the two connecting sides 312 are symmetrically distributed about the vertical center line of the mirror 31. In other examples, the connection edge 312 may extend in the circumferential direction of the mirror body 311 such that the connection edge 312 can correspond to the plurality of glue dispensing grooves 321, respectively.

In some examples, the mirror system 3 further comprises: the baffle 33, the baffle 33 is fastened and connected with the reflector fixing seat 32 through a fastener, so as to clamp the connecting edge 312 between the baffle 33 and the reflector fixing seat 32.

The number of the blocking pieces 33 may be plural, and at least two blocking pieces 33 may be symmetrically distributed about a vertical center line of the reflecting mirror 31, so that not only the mounting reliability of the reflecting mirror 31 can be improved, but also the stress of the reflecting mirror 31 can be uniform.

The baffle 33 and the glue dispensing groove 321 on the same side of the vertical center line of the reflector 31 can be staggered, so that more connection points between the reflector 31 and the reflector fixing seat 32 are formed, and the installation reliability of the reflector 31 is improved. For example, a portion of the connecting edge 312 sandwiched between the blocking piece 33 and the mirror holder 32 may be located above a portion of the connecting edge 312 bonded to the mirror holder 32 by adhesive.

Optionally, the connecting edge 312 has a first portion clamped between the blocking piece 33 and the mirror holder 32, and a second portion bonded to the mirror holder 32 by an adhesive. The extension of the second portion along the direction away from the mirror body 311 may be greater than the extension of the first portion along the direction away from the mirror body 311, so that the connecting edge 312 and the mirror fixing base 32 have a relatively large bonding area, which not only can improve bonding reliability, but also can prevent the bonding glue from polluting the mirror body 311 to affect the imaging effect.

Of course, in other examples, the extension of the second portion in a direction away from the mirror body 311 may also be equal to the extension of the first portion in a direction away from the mirror body 311. The extension dimensions of the second portion and the first portion of the connecting edge 312 may be specifically set according to actual needs, and the present embodiment is not limited herein.

In this embodiment, during the assembly process of the mirror system 3, the mirror 31 and the mirror fixing base 32 may be pre-positioned, the dispensing is performed at the dispensing slot 321 of the mirror fixing base 32, and a portion of the adhesive entering the dispensing slot 321 can contact with the slot wall of the dispensing slot 321, and another portion can contact with the connecting edge 312 of the mirror fixing base 32, so as to adhere the mirror 31 and the mirror fixing base 32.

Then, the baffle 33 is disposed on a side of the connecting edge 312 facing away from the mirror fixing base 32, such that a portion of the connecting edge 312 is located between the baffle 33 and the mirror fixing base 32, and such that the fastening hole on the baffle 33 is aligned with the fastening hole on the mirror fixing base 32, and the fastener passes through the fastening hole of the baffle 33 and is fastened to the fastening hole on the mirror fixing base 32, thereby clamping the connecting edge 312 between the baffle 33 and the mirror fixing base 32, and further improving the mounting reliability of the mirror 31.

In this embodiment, compared with the manner of fixing the mirror 31 and the mirror fixing base 32 by using screws, the present embodiment can ensure the integrity of the mirror 31, and can avoid the problem that the imaging effect is poor due to deformation of the mirror 31 caused by external force factors such as stretching or extrusion in the adjustment process.

Referring to fig. 1-3 and 13, in some embodiments, the mirror system 3 further comprises an optical refractive element 34, the optical refractive element 34 being located between the mirror 31 of the mirror system 3 and the relay optical system 2.

Specifically, the optical refractive element 34 has a first optical surface 341 and a second optical surface 342 that are opposite to each other, and the second optical surface 342 is disposed toward the relay optical system 2; as shown by an arrow in fig. 13, the imaging light beam passing through the relay optical system 2 enters from the second optical surface 342 and enters from the first optical surface 341 to the reflecting surface of the reflecting mirror 31; reflected by the reflecting surface and projected from the second optical surface 342 toward the imaging plane after passing through the optical refractive element 34.

Preferably, in order to reduce the difficulty of manufacturing the mirror system 3, in some embodiments, the optical refraction element 34 may be fixedly disposed on the mirror fixing base 32, and a reflective film layer is attached to one side of the first optical surface 341 of the optical refraction element 34, that is, the mirror 31 is a reflective film layer structure attached to one side of the optical refraction element, which is far away from the optical lens in the relay optical system 2, so that the structure of the mirror system 3 is simplified, and compared with the reflective bowl in the conventional technology, the difficulty of manufacturing the mirror system 3 is greatly reduced, so that the mirror system 3 is convenient to manufacture and has low manufacturing cost.

Embodiments of the present application also provide a projection display device, which may include at least one of: projector, laser television, AR (english is called Augmented Reality, chinese is called augmented Reality), VR (english is called Virtual Reality, chinese is called Virtual Reality), and vehicle-mounted HUD (english is called Head Up Display, chinese is called Head Up Display).

The projection display device provided in this embodiment includes: the lens adjustment apparatus according to any one of the preceding claims. Optionally, the projection display device is an ultra-short focal projection display device. The structure, function and implementation process of the lens adjusting device are the same as or similar to those of the lens adjusting device in any of the foregoing embodiments, and the description of this embodiment is omitted here.

In addition, other structures and functions of the ultrashort focal projection display device in the embodiments of the present application are known to those skilled in the art, and are not described herein for redundancy reduction.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

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

Furthermore, the terms "first," "second," and the like, as used in embodiments of the present application, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated in the present embodiment. Thus, a feature of an embodiment described herein that is termed a "first," "second," etc., may explicitly or implicitly indicate that at least one such feature is included in the embodiment. In the description of the present application, the word "plurality" means at least two or more, for example, two, three, four, etc., unless explicitly defined otherwise in the embodiments.

In this application, unless explicitly stated or limited otherwise in the examples, the terms "mounted," "connected," and "fixed" as used in the examples should be interpreted broadly, e.g., the connection may be a fixed connection, may be a removable connection, or may be integral, and it may be understood that the connection may also be a mechanical connection, an electrical connection, etc.; of course, it may be directly connected, or indirectly connected through an intermediate medium, or may be in communication with each other, or in interaction with each other. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art depending on the specific implementation.

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

Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. A lens adjustment apparatus, comprising:

the front group fixing seat is provided with an accommodating space;

a mirror system accommodated in the accommodation space;

2. The lens adjustment device according to claim 1, wherein the eccentric adjustment mechanism includes: the adjusting screw is used for driving the lens barrel to move under the action of external force so as to adjust the eccentric degree between the relay optical system and the reflector system.

3. The lens adjusting device according to claim 2, wherein the adjusting screws are plural, and at least two of the adjusting screws are symmetrically disposed with respect to a predetermined center plane of the relay optical system.

4. A lens adjusting device according to claim 2 or 3, wherein the adjusting screws have at least three, at least three of the adjusting screws are respectively located at three vertices of a predetermined triangle.

5. The lens adjusting device according to claim 2, wherein the adjusting screw includes: the first screws are multiple, and the first screws and the second screws are distributed in a nonlinear mode.

6. The lens adjustment device of claim 5, wherein the second screw has a threaded section, a non-threaded section, and a head, the non-threaded section being connected between the threaded section and the head;

the flange plate of the lens barrel is provided with a limiting hole, the non-threaded section movably penetrates through the limiting hole, and the non-threaded section can be in contact with the hole wall of the limiting hole.

7. The lens adjustment device of claim 5, wherein the eccentric adjustment mechanism further comprises: the first elastic piece is propped between the lens cone and the second screw;

8. The lens adjustment device of claim 5, wherein the eccentric adjustment mechanism further comprises: one end of the second elastic piece is propped against the front group fixing seat, and the other end of the second elastic piece is propped against the lens cone;

9. The lens adjustment device of claim 1, wherein the mirror system comprises: the reflector is fixedly arranged on the reflector fixing seat, and the reflector fixing seat is in sliding connection with the front group fixing seat.

10. The lens adjustment device of claim 9, wherein the mirror system further comprises an optical refractive element located between the mirror and the relay optical system.

11. The lens adjusting device according to claim 10, wherein the optical refraction element is fixedly arranged on the reflector fixing seat, and the reflector is a reflective film layer structure attached to one side of the optical refraction element away from the optical lens.

12. The lens adjustment device of claim 9, further comprising a focus adjustment mechanism, the focus adjustment mechanism comprising: the guide rail is respectively connected with the front group fixing seat and the reflector fixing seat and is used for guiding the reflector fixing seat to slide relative to the front group fixing seat along the optical axis direction of the relay optical system.

13. The lens adjusting device of claim 12, wherein the plurality of guide rails are disposed on opposite sides of the mirror mount.

14. The lens adjustment device of claim 12, wherein the focal length adjustment mechanism comprises: the driving piece is installed on the front group fixing seat, and is connected with the reflector fixing seat through the driving piece so as to drive the reflector fixing seat to move relative to the front group fixing seat.

15. The lens adjustment device of claim 9, wherein the mirror comprises: a reflector body and a connecting edge connected to the edge of the reflector body;

16. The lens adjustment device of claim 15, wherein the mirror system further comprises: the baffle plate is fixedly connected with the reflector fixing seat through a fastener, so that the connecting edge is clamped between the baffle plate and the reflector fixing seat.

17. A projection display device, comprising: the lens adjustment apparatus according to any one of claims 1 to 16.