CN219872089U

CN219872089U - Lens adjusting mechanism, projection device, optical-mechanical system and photo-curing printer

Info

Publication number: CN219872089U
Application number: CN202321011235.1U
Authority: CN
Inventors: 邢永锋
Original assignee: Guangzhou Heygears IMC Inc
Current assignee: Guangzhou Heygears IMC Inc
Priority date: 2023-04-27
Filing date: 2023-04-27
Publication date: 2023-10-20
Anticipated expiration: 2033-04-27

Abstract

The application provides a lens adjusting mechanism, a projection device, an optical-mechanical system and a photo-curing printer, and relates to the technical field of printing. The lens adjusting mechanism is used for adjusting the position of the projection lens of the photo-curing printer relative to the irradiation assembly, and the clamping assembly of the lens adjusting mechanism comprises a frame, an elastic clamping piece and an adjusting piece, wherein the elastic clamping piece and the adjusting piece are arranged on the frame. The projection lens can be pushed to generate displacement by adjusting the position of the adjusting piece, the elastic clamping piece is used for elastically abutting against the outer peripheral surface of the projection lens in the adjusting space, the projection lens in the adjusting space of the frame can be clamped by the elastic clamping piece, and the elastic clamping piece can provide resistance in the adjusting process of the projection lens, so that the projection lens is relatively stable in the adjusting process, and the projection lens is prevented from being displaced uncontrollably. The position of the projection lens relative to the irradiation assembly can be controllably and accurately adjusted by the lens adjusting mechanism. The projection device, the optical-mechanical system and the photo-curing printer comprise the lens adjusting mechanism.

Description

Lens adjusting mechanism, projection device, optical-mechanical system and photo-curing printer

Technical Field

The utility model relates to the technical field of printing, in particular to a lens adjusting mechanism, a projection device, an optical-mechanical system and a photo-curing printer.

Background

The optical-mechanical system is a core component of the photo-curing printer, and the main components are an irradiation component and a projection lens. The imaging accuracy of the optical-mechanical system directly affects the quality of the print, while the main factors affecting the accuracy of the optical-mechanical system are the accuracy of the optics in the irradiation assembly and projection lens, as well as the structural components that hold the optics. The optical device itself and the structure for fixing the optical device have certain errors under the influence of the manufacturing process; there is also some assembly error in assembling the optical device. Together, these error contributions cause the actual projected image to deviate from the theoretical standard image. In order to overcome the influence of the screen deviation on the printing effect, the projection screen can be close to the theoretical standard drawing surface until the theoretical standard drawing surface is completely overlapped finally by fine adjusting the position of the projection lens. However, the existing mode of adjusting the projection lens is simpler, and the controllability and the precision of adjustment are poorer.

Disclosure of Invention

The utility model aims to provide a lens adjusting mechanism, an optical system and a photo-curing printer, which can conveniently adjust the position of a projection lens and have better controllability and precision.

Embodiments of the present application are implemented as follows:

in a first aspect, the present application provides a lens adjustment mechanism for adjusting a position of a projection lens of a photo-curing printer relative to an irradiation assembly, the lens adjustment mechanism comprising a base for mounting the irradiation assembly and a clamping assembly connected to the base, the clamping assembly comprising:

a frame coupled to the base, the frame forming an adjustment space for accommodating at least a portion of the projection lens;

the elastic clamping piece is arranged on the frame and is used for elastically abutting against the outer peripheral surface of the projection lens in the adjusting space so as to clamp the projection lens and maintain the optical axis of the projection lens to extend along the first direction;

the adjusting piece is connected to the frame and used for abutting against the outer peripheral surface of the projection lens, and the position of the adjusting piece in the direction perpendicular to the first direction is adjustable.

In an alternative embodiment, the number of resilient clips is a plurality; the elastic clamping pieces are arranged at intervals along the circumferential direction and are used for surrounding and jointly clamping the projection lens.

In an alternative embodiment, the resilient clip is a spring plunger.

In an alternative embodiment, the side of the frame facing the adjustment space is provided with a plurality of mounting holes, and the elastic clamping member is arranged in the mounting holes.

In an alternative embodiment, the number of adjustment members is a plurality; the adjusting members are arranged at intervals along the circumferential direction and are used for abutting the projection lens from a plurality of directions perpendicular to the first direction.

In an alternative embodiment, the number of the adjusting members is equal to the number of the elastic clamping members, and the adjusting members and the elastic clamping members are alternately arranged at intervals in the circumferential direction.

In an alternative embodiment, the frame comprises a fixing portion and a locking piece, the fixing portion is connected to the base, the fixing portion and the locking piece are detachably connected, and the fixing portion and the locking piece jointly enclose an adjusting space.

In an alternative embodiment, one end of the projection lens in the axial direction is provided with a connecting part, the connecting part is used for being detachably connected with the irradiation assembly, and the connecting part is provided with a limiting chute; the frame is provided with a limiting boss, and the limiting boss is used for being in sliding fit with the limiting sliding groove so as to restrict the projection lens to translate relative to the limiting boss along a second direction, and the second direction is perpendicular to the first direction.

In an alternative embodiment, the frame is provided with a guide rail extending in a third direction perpendicular to the first and second directions, and the limit boss is slidably engaged with the guide rail.

In an alternative embodiment, the frame is provided with a mounting groove, the guide rail is arranged in the mounting groove, the part of the limiting boss is embedded in the mounting groove and is in sliding fit with the guide rail, and the size of the mounting groove in the third direction is larger than that of the limiting boss in the third direction.

In an alternative embodiment, a resilient abutment is provided on the frame for resiliently abutting the projection lens and providing the projection lens with a tendency to move towards the irradiation assembly.

In an alternative embodiment, one end of the projection lens in the axial direction is provided with a connecting portion for detachably connecting with the irradiation assembly, and the elastic abutment is for elastically abutting against the connecting portion.

In an alternative embodiment, the resilient abutment is adapted to resiliently abut the connection portion in the first direction.

In an alternative embodiment, the resilient abutment is a spring plunger.

In an alternative embodiment, a locating pin is provided on the base for mating with the irradiation assembly to define the position of the irradiation assembly relative to the base.

In an alternative embodiment, the lens adjusting mechanism further includes a support base, the base is connected to the support base, and a position of the base relative to the support base in the first direction is adjustable.

In an alternative embodiment, the base is slidably connected to the support, the support is provided with a screw micrometer, a measuring rod of the screw micrometer extends along a first direction, and an end of the measuring rod is in transmission connection with the base.

In an alternative embodiment, the adjustment member is an adjustment screw threaded to the frame.

In a second aspect, the present application provides a projection apparatus, comprising:

the lens adjustment mechanism of any one of the embodiments of the first aspect described above;

the projection lens is clamped by the clamping component of the lens adjusting mechanism;

the irradiation assembly is connected to the base of the lens adjusting mechanism and matched with one end of the projection lens in the axial direction, and the irradiation assembly can emit light beams passing through the projection lens.

In an alternative embodiment, the projection lens includes, in order from an object side to an image side along an optical axis thereof:

a first lens having positive optical power;

a second lens having negative optical power;

a third lens having negative optical power;

a fourth lens having positive optical power;

a fifth lens having negative optical power;

a sixth lens having positive optical power;

a seventh lens having positive optical power;

an eighth lens having positive optical power;

a ninth lens having positive optical power;

the first lens to the ninth lens are spherical lenses.

In an alternative embodiment, the object side surface of the first lens is convex, and the image side surface is concave;

and/or the object side surface of the second lens is a convex surface, and the image side surface is a concave surface;

and/or, the object side surface and the image side surface of the third lens are concave surfaces;

And/or, the object side surface and the image side surface of the fourth lens are convex;

and/or, the object side surface and the image side surface of the fifth lens are concave surfaces;

and/or the object side surface of the sixth lens is a concave surface, and the image side surface is a convex surface;

and/or, the object side surface and the image side surface of the seventh lens are convex;

and/or, the object side surface and the image side surface of the eighth lens are convex;

and/or, the object side surface of the ninth lens is a convex surface, and the image side surface is a concave surface.

In an alternative embodiment, the radius of curvature of the object-side surface of the first lens is 40-50 mm, and the radius of curvature of the image-side surface is 700-800 mm;

and/or the curvature radius of the object side surface of the second lens is 30-40 mm, and the curvature radius of the image side surface is 12-18 mm;

and/or the curvature radius of the object side surface of the third lens is-30 to-40 mm, and the curvature radius of the image side surface is 15 to 20mm;

and/or the curvature radius of the object side surface of the fourth lens is 40-50 mm, and the curvature radius of the image side surface is-35 to-40 mm;

and/or the curvature radius of the object side surface of the fifth lens is-12 to-18 mm, and the curvature radius of the image side surface is 3000 to 5000mm;

and/or the curvature radius of the object side surface of the sixth lens is-50 to-70 mm, and the curvature radius of the image side surface is-15 to-20 mm;

And/or the curvature radius of the object side surface of the seventh lens is 80-120 mm, and the curvature radius of the image side surface is-25 to-30 mm;

and/or the curvature radius of the object side surface of the eighth lens is 60-70 mm, and the curvature radius of the image side surface is-100 to-120 mm;

and/or the radius of curvature of the object side surface of the ninth lens is 20-30 mm, and the radius of curvature of the image side surface is 70-100 mm.

In a third aspect, the present application provides an optical-mechanical system, including the projection device according to any one of the embodiments of the second aspect.

In an alternative embodiment, at least two projection devices are included, each capable of forming a projection screen on the same target imaging surface.

In a fourth aspect, the present application provides a photo-curing printer comprising an optical-mechanical system according to any of the embodiments of the third aspect.

The embodiment of the application has the beneficial effects that:

the application provides a lens adjusting mechanism for adjusting the position of a projection lens of a photo-curing printer relative to an irradiation assembly. The clamping assembly is connected to the base and comprises a frame, an elastic clamping piece and an adjusting piece, wherein the elastic clamping piece and the adjusting piece are arranged on the frame. The frame is connected to the base, and the frame forms an adjustment space for accommodating at least a portion of the projection lens. The elastic clamping piece is used for elastically abutting against the outer peripheral surface of the projection lens in the adjusting space so as to clamp the projection lens and maintain the optical axis of the projection lens to extend along the first direction. The adjusting piece is used for abutting against the outer peripheral surface of the projection lens. The projection lens in the adjusting space of the frame can be clamped by the elastic clamping piece, and the projection lens still has a certain displacement in the direction perpendicular to the axial direction due to the elastic characteristic of the elastic clamping piece. The position of the adjusting piece can be adjusted to push the projection lens to generate displacement, and compared with the way of directly pushing or knocking the projection lens by hands, the position adjustment of the projection lens can be controlled more by using the adjusting piece. And moreover, the projection lens is clamped by the elastic clamping piece, and the elastic clamping piece can provide resistance in the adjustment process of the projection lens, so that the projection lens is relatively stable in the adjustment process, and the projection lens is prevented from being displaced uncontrollably. When the projection lens is adjusted to a proper position, the relative position of the projection lens and the irradiation assembly can be locked by utilizing the related locking structure, so that the adjustment is completed. Therefore, the lens adjusting mechanism provided by the application can controllably and accurately adjust the position of the projection lens relative to the irradiation component.

The projection device provided by the application comprises the lens adjusting mechanism; the optical-mechanical system comprises the projection device, and the photo-curing printer comprises the optical-mechanical system. Because the photo-curing printer uses the lens adjusting mechanism provided by the application, the position of the projection lens relative to the irradiation component can be accurately adjusted, which is beneficial to improving the imaging precision of an optical-mechanical system, thereby ensuring the printing quality.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an optical system and a target imaging surface according to an embodiment of the application;

FIG. 2 is an exploded view of an optical-mechanical system at a first viewing angle in accordance with one embodiment of the present application;

FIG. 3 is an exploded view of an optical-mechanical system at a second viewing angle in an embodiment of the present application;

FIG. 4 is an exploded view of the clamping assembly and the base at a first view angle in accordance with one embodiment of the present application;

FIG. 5 is an exploded view of the clamping assembly and the base at a second view angle in accordance with one embodiment of the present application;

FIG. 6 is a schematic diagram illustrating an assembly of a lens adjusting mechanism at a first viewing angle according to an embodiment of the present application;

FIG. 7 is a schematic diagram illustrating an assembly of a lens adjusting mechanism at a second viewing angle according to an embodiment of the present application;

FIG. 8 is a schematic view of a projection lens according to an embodiment of the application;

FIG. 9 is a diagram showing the optical distortion of the projection lens according to the embodiment of Table 1;

FIG. 10 is a chart showing the MTF of the projection lens of the embodiment of Table 1;

FIG. 11 is a schematic diagram of an optical-mechanical system according to an embodiment of the application.

010-optomechanical system; 011-projection means; 020-a target imaging plane; 100-a lens adjusting mechanism; 110-a base; 111-a sliding part; 112-locating pins; 120-a clamping assembly; 121-a frame; 1211-a fixing portion; 1212-locking block; 1213-locking piece set screw; 1214-mounting holes; 1215-mounting slots; 1216-a through hole; 122-elastic clamps; 123-an adjusting member; 124-limit boss; 125-guide rail; 1251-end cap; 1252-end cap set screw; 126-resilient abutments; 127-adjusting space; 130-a supporting seat; 131-helix micrometer; 200-a projection lens; 201-a first lens; 202-a second lens; 203-a third lens; 204-a fourth lens; 205-a fifth lens; 206-a sixth lens; 207-seventh lens; 208-eighth lens; 209-ninth lens; 210-a cylinder; 220-connecting part; 221-limiting sliding grooves; 222-lens fixing screws; 230-diaphragm; 300-irradiation assembly.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

The primary factors affecting the accuracy of the projection device are the accuracy of the optics in the irradiation assembly and projection lens and the structural components that hold the optics. In the related art, a light curing printer adopts a projection device mainly based on DLP and LCD imaging chips, and the chips are limited by the production process although the accuracy is very high, and certain design tolerance still exists, namely the actual imaging area deviates from the theoretical standard area. Other optical devices such as prisms and lenses also suffer from dimensional errors during their fabrication. The precision of the structural members for fixing the optical devices, such as the structural members for fixing the optical devices in the projection lens and the irradiation component, is affected by the multi-dimensions of the mold making, the material injection molding conditions, the post-processing treatment and the like, and is poorer than that of the optical devices. There is also some assembly error in assembling the optical device. Together, these error contributions cause the actual projected image to deviate from the theoretical standard image. In order to improve the influence of the screen deviation on the printing effect, the projection screen can be close to the theoretical standard drawing until the theoretical standard drawing is completely overlapped finally by adjusting the position of the projection lens. However, the existing process of adjusting the projection lens is rough, the projection lens is mainly knocked by a hard object to enable the projection lens to be displaced, or the projection lens is manually moved, the adjustment amount is uncontrollable, and the operability is poor.

In order to solve the problems of inconvenient adjustment, poor controllability and poor precision of the position of the projection lens in the related art, the embodiment of the application provides a lens adjusting mechanism, which can remarkably improve the precision and the controllability of the position adjustment of the projection lens by matching an adjusting piece with an elastic clamping piece. In addition, the embodiment of the application also provides a projection device, an optical system and a photo-curing printer.

Fig. 1 is a schematic diagram of a projection device 011 and a target imaging surface 020 according to an embodiment of the present application. Referring to fig. 1, a projection apparatus 011 is provided in the present embodiment, which includes a projection lens 200, an irradiation assembly 300, and a lens adjusting mechanism 100. Wherein, one axial end of the projection lens 200 is matched with the irradiation assembly 300, and the light emitted by the irradiation assembly 300 is projected onto the target imaging surface 020 after passing through the projection lens 200, so as to form an image.

In this embodiment, the projection lens 200 includes a barrel 210, a lens (not shown) disposed in the barrel 210, and a connecting portion 220 disposed at an end of the barrel 210, and the projection lens 200 can be fixedly connected with the housing of the irradiation assembly 300 through the connecting portion 220. The connection part 220 of the projection lens 200 may be detachably connected with the housing of the irradiation assembly 300 by a lens fixing screw 222. Specifically, the connection part 220 is a rectangular plate body, and four lens fixing screws 222 are disposed at four corners of the connection part 220, so that the connection part 220 can be firmly connected with the irradiation assembly 300. The specific structure and operation principle of the projection lens 200 may refer to the prior art, and will not be described herein.

FIG. 2 is an exploded view of a projection device 011 at a first viewing angle in an embodiment of the present application; fig. 3 is an exploded view of a projection device 011 at a second viewing angle in an embodiment of the present application. As shown in fig. 2 and 3, the adjusting assembly of the projection lens 200 provided in the present embodiment includes a base 110, a clamping assembly 120, and a supporting base 130. Wherein the base 110 is used for installing the irradiation assembly 300, and fixing the position of the irradiation assembly 300. The clamping assembly 120 is connected to the base 110, and is used for clamping the projection lens 200, so that a generally fixed relative positional relationship between the projection lens 200 and the irradiation assembly 300 is maintained, fine adjustment can be performed on the position of the projection lens 200 through the clamping assembly 120, the relative position between the projection lens 200 and the irradiation assembly 300 can be made to be optimal through fine adjustment, and the imaging precision of the projection device 011 is also higher. The base 110 is connected to the support 130, and the position of the base 110 relative to the support 130 is adjustable, so that the distance between the projection lens 200 and the overall structure of the irradiation assembly 300 relative to the target imaging surface 020 can be adjusted. In this embodiment, the optical axis of the projection lens 200 extends along the first direction (i.e. z direction in the figure) when the projection lens 200 is clamped by the clamping assembly 120, and the clamping assembly 120 can adjust the position of the projection lens 200 in the direction perpendicular to the first direction. By adjusting the position of the base 110 relative to the support 130, the position of the overall structure of the projection lens 200 and the irradiation assembly 300 in the first direction can be adjusted, and since the projection lens 200 and the target imaging surface 020 are spaced apart in the first direction, adjusting the position of the base 110 relative to the support 130 is equivalent to adjusting the distance between the projection lens 200 and the target imaging surface 020.

In this embodiment, the base 110 is slidably connected to the supporting seat 130, the supporting seat 130 is provided with a screw micrometer 131, a measuring rod of the screw micrometer 131 extends along a first direction, and an end of the measuring rod is in transmission connection with the base 110. Specifically, a sliding portion 111 is fixedly connected to the base 110, and is slidably connected to the supporting seat 130 through the sliding portion 111, and a spindle end of the screw micrometer 131 is connected to the sliding portion 111. By rotating the screw micrometer 131, the measuring rod can be extended and contracted along the axial direction, so that the base 110 is driven to move in the first direction, and the projected size can be adjusted to a proper size, so that the alignment of the subsequent projected picture is facilitated. The screw micrometer 131 is used for driving the base 110, so that the adjustment accuracy is high, and the corresponding reading after adjustment can be recorded to provide reference for subsequent adjustment; alternatively, in the case where the lens adjustment mechanism 100 is used only to adjust the position of the projection lens 200, which is not part of the projection apparatus 011, consistency in the first direction of the different projection lenses 200 adjusted by the lens adjustment mechanism 100 can be known by recording the adjusted corresponding readings.

The clamping assembly 120 includes a frame 121, a resilient clamping member 122, and an adjustment member 123. The adjusting member 123 is connected to the frame 121, the adjusting member 123 is used for abutting against the outer peripheral surface of the projection lens 200, and the position of the adjusting member 123 in the direction perpendicular to the first direction is adjustable. In the present embodiment, the adjusting member 123 is an adjusting screw screwed to the frame 121. The frame 121 is coupled to the base 110, and the frame 121 forms an adjustment space 127 (see fig. 7) for accommodating at least a portion of the projection lens 200. The elastic clamping member 122 is disposed on the frame 121, and the elastic clamping member 122 is configured to elastically abut against an outer peripheral surface of the projection lens 200 (i.e., an outer peripheral surface of the cylinder 210 of the projection lens 200) disposed in the adjusting space 127, so as to clamp the projection lens 200 and maintain an optical axis of the projection lens 200 extending along the first direction. An adjusting screw as the adjusting member 123 is screwed to the frame 121, and a front end of the adjusting screw is used to abut against an outer circumferential surface of the projection lens 200, and by screwing the adjusting screw, the projection lens 200 can be pushed to move in a radial direction thereof, that is, a position of the projection lens 200 in a direction perpendicular to the first direction is adjusted. During the adjustment process, the elastic clamping member 122 deforms and keeps abutting against the projection lens 200. In alternative other embodiments, the adjusting member 123 may be any structure capable of supporting the projection lens 200 in the art, and is used to push the projection lens 200 to generate a position offset. In one particular example, the adjustment member 123 may comprise an ejector bar that is axially movable along itself and locked in position by a locking mechanism; optionally, the pushing rod is sleeved in the locking mechanism, and one end of the pushing rod abuts against the projection lens 200.

FIG. 4 is an exploded view of the clamping assembly 120 and the base 110 from a first perspective in accordance with one embodiment of the present application; FIG. 5 is an exploded view of the clamping assembly 120 and the base 110 from a second perspective in accordance with one embodiment of the present application; FIG. 6 is a schematic diagram illustrating an assembly of the lens adjustment mechanism 100 at a first viewing angle according to an embodiment of the present application; fig. 7 is an assembly schematic diagram of the lens adjusting mechanism 100 under a second view angle according to an embodiment of the application. Referring to fig. 4 to 7, in the present embodiment, the frame 121 includes a fixing portion 1211 and a locking piece 1212, the fixing portion 1211 is connected to the base 110, the fixing portion 1211 and the locking piece 1212 are detachably connected, and the fixing portion 1211 and the locking piece 1212 jointly enclose an adjusting space 127 of the frame 121, in other words, the fixing portion 1211 and the locking piece 1212 jointly enclose the projection lens 200. In this embodiment, the fixing portion 1211 is generally U-shaped, and the opening thereof faces in a second direction (i.e., an x direction in the drawing), which is perpendicular to the first direction. The locking piece 1212 is detachably connected to the opening of the fixing portion 1211, thereby enclosing the projection lens 200 within the frame 121. By attaching and detaching the lock 1212, the projection lens 200 can be more conveniently attached to and detached from the holding space. In the present embodiment, the lock block 1212 is connected to the fixing portion 1211 by two lock block fixing screws 1213; in alternative other embodiments, the locking piece 1212 may also be detachably coupled to the fixed portion 1211 via a snap-fit arrangement.

It should be appreciated that in other embodiments of the present application, the frame 121 may also be unitary, in which case the projection lens 200 may penetrate into the adjustment space 127 of the frame 121 in the first direction and be clamped by the clamping assembly 120.

Further, the clamping assembly 120 includes a plurality of elastic clamping members 122 disposed at intervals along a circumferential direction, and the plurality of elastic clamping members 122 are used for surrounding and commonly clamping the projection lens 200. In the present embodiment, the clamping assembly 120 includes four elastic clamping members 122, and the four elastic clamping members 122 are uniformly spaced along the circumferential direction, so that the abutment force of the projection lens 200 by each elastic clamping member 122 can be relatively uniform along the circumferential direction of the projection lens 200. In the present embodiment, two elastic clamping pieces 122 are disposed inside the lock block 1212, and the other two elastic clamping pieces 122 are disposed inside the fixing portion 1211. It will be appreciated that the frame 121 has an inner side facing the adjustment space 127 and an outer side facing away from the adjustment space 127, the inner side of the locking block 1212 and the inner side of the fixing portion 1211 constituting the inner side of the frame 121. In this embodiment, a plurality of mounting holes 1214 are disposed on a side of the frame 121 facing the adjustment space 127, and the elastic clamping member 122 is disposed on the mounting holes 1214.

In alternative embodiments, the number of elastic clamping members 122 may be increased or decreased as desired, such as using three, five or six elastic clamping members 122 to jointly clamp the projection lens 200. In other embodiments, the elastic clamping member 122 and the adjusting member 123 may be used to clamp the projection lens 200 together, so that the plurality of elastic clamping members 122 are not required to be disposed around the projection lens 200. In this case, two or even one elastic clamping member 122 may be provided on the frame 121, and it is also possible to clamp the projection lens 200 using the clamping assembly 120 and to achieve adjustment of the position of the projection lens 200.

Alternatively, the resilient clamp member 122 is a spring plunger, and in particular a roller spring plunger, which is comprised of a ball and a spring, the ball being located at one end of the spring and adapted to contact an object of action. The ball of the spring plunger may roll freely to reduce the frictional resistance of the projection lens 200 relative to the spring plunger during adjustment of the projection lens 200. The specific structure and working principle of the spring plunger can be referred to the prior art, and will not be described here.

In the present embodiment, the clamping assembly 120 includes a plurality of adjusting members 123 disposed at intervals along the circumferential direction, and the plurality of adjusting members 123 are configured to abut against the projection lens 200 from a plurality of directions perpendicular to the first direction. In this embodiment, the number of the adjusting members 123 is equal to (also four) the number of the elastic clamping members 122, and the adjusting members 123 and the elastic clamping members 122 are alternately arranged at intervals in the circumferential direction. Further, the adjustment members 123 are also uniformly spaced in the circumferential direction. Specifically, in this embodiment, the adjusting member 123 is screwed into the screw hole from the outside of the frame 121, and the front end of the adjusting member 123 extends into the inside of the frame 121, so as to abut against the projection lens 200. Two adjusting members 123 may abut against the outer circumferential surface of the projection lens 200 in the second direction (the direction of the applied force is opposite), and the other two adjusting members 123 may abut against the outer circumferential surface of the projection lens 200 in the third direction (i.e., the y direction in the drawing) (the direction of the applied force is opposite). The position of the projection lens 200 can be adjusted in the second direction and the third direction by screwing the four adjusting members 123 according to the adjustment requirement. It should be noted that when one adjustment member 123 is screwed in, the other opposite adjustment member 123 should be screwed out a distance appropriately to avoid blocking the movement of the projection lens 200. When the projection lens 200 is pushed by the adjusting member 123, at least part of the elastic clamping member 122 will deform, and the elastic clamping member 122 always keeps clamping the projection lens 200, so that the elastic clamping member 122 can provide a certain resistance in the displacement process of the projection lens 200, and the movement of the projection lens 200 is relatively stable and is not easy to shake or lose control. In this embodiment, three adjusting members 123 are disposed through the fixing portion 1211 of the frame 121 (one of the adjusting members 123 also passes through the base 110), and the other adjusting member 123 is disposed through the locking piece 1212.

In alternative embodiments, the number of the adjusting members 123 may be adjusted, for example, only one adjusting member 123 is used, and the adjusting member 123 and the elastic clamping member 122 jointly clamp the projection lens 200 to adjust the position of the projection lens 200 in one direction; alternatively, two adjusting members 123 having adjusting directions perpendicular to each other are used, and the two adjusting members 123 and the elastic clamping member 122 clamp the projection lens 200 together to adjust the position of the projection lens 200 in the second direction and the third direction; alternatively, three, five, or more adjustment members 123 are used, so that the plurality of adjustment members 123 can collectively firmly clamp and fix the projection lens 200.

In this embodiment, the connection portion 220 of the projection lens 200 is provided with a limiting chute 221, the frame 121 is provided with a limiting boss 124, and the limiting boss 124 is used for sliding fit with the limiting chute 221 to restrict the projection lens 200 from translating relative to the limiting boss 124 along the second direction. Further, a guide rail 125 is disposed on the frame 121, the guide rail 125 extends along a third direction, and the limiting boss 124 is slidably engaged with the guide rail 125. Through the sliding fit relation between the limiting sliding groove 221 and the limiting boss 124 and the fit relation between the limiting boss 124 and the guide rail 125, the projection lens 200 can move relative to the base 110 in the second direction, and can also drive the limiting boss 124 to move relative to the base 110 in the third direction, so that the requirement of adjusting the position on a plane perpendicular to the first direction can be met, and the movement can be more stable under the guiding action of the limiting sliding groove 221 and the guide rail 125. In the present embodiment, the size of the limit chute 221 in the second direction is larger than that of the limit boss 124, and the sizes of the limit chute 221 and the limit boss 124 in the third direction are equivalent, so that the limit boss 124 can be limited to slide only in the second direction relative to the limit chute 221. Further, the cross section of the limiting boss 124 perpendicular to the first direction may be non-circular, and in this embodiment is specifically rectangular, so that the relative rotation of the limiting boss 124 and the limiting chute 221 can be limited, and the projection lens 200 is prevented from rotating around its optical axis (or other axis parallel to the optical axis), so that the projection lens 200 can only translate, and unnecessary deflection of the projection lens 200 during the position adjustment process is avoided.

Specifically, the frame 121 is provided with a mounting groove 1215, the guide rail 125 is disposed in the mounting groove 1215, the local part of the limit boss 124 is embedded in the mounting groove 1215 and slidably engaged with the guide rail 125, the size of the mounting groove 1215 in the third direction is greater than the size of the limit boss 124 in the third direction, so that the limit boss 124 can translate relative to the frame 121 in the third direction. In this embodiment, two cylindrical guide rails 125 are disposed in the mounting groove 1215, the two guide rails 125 are disposed in parallel at intervals, and two mating holes slidably matched with the guide rails 125 are disposed on the limiting boss 124, so that the limiting boss 124 can stably slide on the guide rails 125. In alternative embodiments, the specific form of the rail 125 and the manner of engagement with the stop boss 124 may be modified, such as where the rail 125 is a T-shaped table and the stop boss 124 is provided with a T-shaped slot that engages the T-shaped table.

Referring to fig. 6, in the present embodiment, two through holes 1216 are provided on the fixing portion 1211 of the frame 121, the through holes 1216 extend from the outside of the fixing portion 1211 to the mounting groove 1215, and two guide rails 125 are inserted into the mounting groove 1215 through the two through holes 1216. In order to prevent the guide rail 125 from sliding out of the through hole 1216, an end cap 1251 is further provided outside the fixing portion 1211, the end cap 1251 is connected to the fixing portion 1211 by an end cap fixing screw 1252, and the end cap 1251 can block one end of the through hole 1216 outside the fixing portion 1211, thereby preventing the guide rail 125 from sliding out. Further, in order to ensure the stability of the guide rail 125, the inner wall of the mounting groove 1215 is further provided with a limiting hole matched with the end of the guide rail 125, and the limiting hole is a blind hole. When the guide rail 125 is installed, one end of the guide rail 125 is first inserted into the installation groove 1215, then further inserted into the limiting hole in the installation groove 1215, and finally the end cap 1251 is installed.

In this embodiment, the frame 121 is further provided with an elastic supporting member 126, and the elastic supporting member 126 is used for elastically supporting the projection lens 200 and providing the projection lens 200 with a tendency to move toward the irradiation assembly 300. It should be appreciated that during adjustment of the position of the projection lens 200, the projection lens 200 and the irradiation assembly 300 are not locked, in other words, the lens set screw 222 is not installed or locked, and therefore the resilient abutment 126 is used to press the projection lens 200 against the housing of the irradiation assembly 300, so that the position of the projection lens 200 in the first direction is relatively stable. In the present embodiment, the elastic propping members 126 elastically prop against the connecting portion 220 along the first direction, and the number of the elastic propping members 126 is four to improve the stability during the prop-against. The resilient abutment 126 may alternatively be a spring plunger.

In this embodiment, the base 110 is provided with a positioning pin 112, and the positioning pin 112 is used for being in plug-fit with the irradiation assembly 300 so as to define the position of the irradiation assembly 300 relative to the base 110. When the irradiation assembly 300 is installed, the irradiation assembly 300 may be inserted into the positioning pins 112, and then the irradiation assembly 300 may be fixed to the base 110 using screws or other clamping structures, so that the installation accuracy of the irradiation assembly 300 may be improved.

In the embodiment of the present application, the process of adjusting the position of the projection lens 200 is as follows:

1) When the locking block 1212 is removed, the projection lens 200 and the irradiation assembly 300 are mounted on the lens adjusting mechanism 100, the projection lens 200 is put into the fixing portion 1211 of the frame 121, and the limit boss 124 is inserted into the limit chute 221; the irradiation assembly 300 is inserted into the positioning pin 112 and fixed with the base 110, and the lens fixing screw 222 is not assembled or the lens fixing screw 222 is not locked, so that the projection lens 200 can move within a certain range relative to the irradiation assembly 300; the elastic supporting member 126 abuts against the connecting portion 220 of the projection lens 200, so as to press the projection lens 200 against the housing of the irradiation assembly 300.

2) The lock block 1212 is attached to the fixing portion 1211, and the projection lens 200 is clamped by the elastic clamp 122 of the clamp assembly 120, thereby completing the preparation before adjustment.

3) A standard image, i.e., the target image to be aligned by the projection lens 200, is placed on the target imaging surface 020, and may be a piece of developing paper with a calibration pattern, semi-transparent glass, or other plane for viewing.

4) By adjusting the position of the base 110 relative to the slider, the projected frame size can be adjusted to a suitable size to facilitate subsequent projected frame alignment; then, the adjusting piece 123 arranged at 90 degrees in four directions of the projection lens 200 is adjusted to enable the projection lens 200 to move in the second direction and the third direction, and the aligning process is completed after the standard drawing is aligned.

5) The relative positions of the projection lens 200 and the irradiation assembly 300 are locked by the lens fixing screw 222.

In this embodiment, the lens adjustment mechanism 100 may be used as a part of the projection apparatus 011, and after the adjustment work of the projection lens 200 is completed, the projection apparatus 011 including the lens adjustment mechanism 100 may be integrally mounted to the photo-curing printer, and the projection lens 200 may be clamped by the adjustment member 123 on the basis of this. In other embodiments, the lens adjustment mechanism 100 may be an adjustment tool independent of the projection device 011, and after the relative positions of the projection lens 200 and the irradiation assembly 300 are locked, the projection lens 200 and the irradiation assembly 300, which have been fastened, may be removed from the lens adjustment mechanism 100 and then installed into the photo-curing printer.

Fig. 8 is a schematic diagram of a projection lens 200 according to an embodiment of the application. As shown in fig. 8, the lens assembly provided in this embodiment includes, in order from an object side (left side in fig. 8) to an image side (right side in fig. 8) along an optical axis (i.e., a dashed line L in the drawing), a first lens 201, a second lens 202, a third lens 203, a fourth lens 204, a fifth lens 205, a sixth lens 206, a seventh lens 207, an eighth lens 208, and a ninth lens 209. Wherein the first lens 201 has positive power, the second lens 202 has negative power, the third lens 203 has negative power, the fourth lens 204 has positive power, the fifth lens 205 has negative power, the sixth lens 206 has positive power, the seventh lens 207 has positive power, the eighth lens 208 has positive power, and the ninth lens 209 has positive power. When the lens has positive optical power, it has a converging (converging) effect on the light beam, and when the lens has negative optical power, it has a diverging effect on the light beam.

When the projection lens 200 provided in the present embodiment is used in the projection device 011, the light of the irradiation assembly 300 enters from the image side of the projection lens 200 and exits from the object side of the projection lens 200; depending on the reversibility of light, in other embodiments, the light of the irradiation assembly 300 may also enter from the object side of the projection lens 200 and exit from the image side of the projection lens 200.

In the embodiment of the present application, the first lens 201 to the ninth lens 209 are spherical lenses, that is, the first lens 201, the second lens 202, the third lens 203, the fourth lens 204, the fifth lens 205, the sixth lens 206, the seventh lens 207, the eighth lens 208 and the ninth lens 209 are spherical lenses.

The projection lens 200 provided by the embodiment of the application ensures that the better imaging effect can be ensured while the lenses with smaller number are used by reasonably setting the positive and negative relations and the arrangement sequence of the focal power of each lens, thereby being beneficial to the miniaturization of equipment. In addition, each lens adopts a spherical lens, so that the manufacturing cost can be reduced to a large extent.

Further, in the present embodiment, the object side surface of the first lens element 201 is convex, and the image side surface is concave; the second lens element 202 has a convex object-side surface and a concave image-side surface; the object side surface and the image side surface of the third lens 203 are concave surfaces; the object-side surface and the image-side surface of the fourth lens element 204 are convex; the object side surface and the image side surface of the fifth lens element 205 are concave; the sixth lens element 206 has a concave object-side surface and a convex image-side surface; the object side surface and the image side surface of the seventh lens 207 are both convex; the object-side surface and the image-side surface of the eighth lens element 208 are convex; the ninth lens element 209 has a convex object-side surface and a concave image-side surface. It will be appreciated that the object side of the lens, i.e. the side facing the object side, i.e. the left side in the figure; the image side of the lens is the side facing the image side, i.e. the right side in the figure. In alternative other embodiments, the shapes of the first lens 201 to the ninth lens 209 may be partially selected from the above shapes, or may be completely different from the above shapes, but the positive-negative relationship of the optical powers of the respective lenses should be ensured to be unchanged.

Further, the radius of curvature of the object-side surface of the first lens element 201 is 40-50 mm, and the radius of curvature of the image-side surface is 700-800 mm; the radius of curvature of the object-side surface of the second lens element 202 is 30-40 mm, and the radius of curvature of the image-side surface is 12-18 mm; the radius of curvature of the object side surface of the third lens element 203 is-30 to-40 mm, and the radius of curvature of the image side surface is 15 to 20mm; the curvature radius of the object side surface of the fourth lens element 204 is 40-50 mm, and the curvature radius of the image side surface is-35 to-40 mm; the radius of curvature of the object side surface of the fifth lens element 205 is-12 to-18 mm, and the radius of curvature of the image side surface is 3000 to 5000mm; the radius of curvature of the object-side surface of the sixth lens element 206 is-50 to-70 mm, and the radius of curvature of the image-side surface is-15 to-20 mm; the radius of curvature of the object side of the seventh lens element 207 is 80-120 mm, and the radius of curvature of the image side is-25 to-30 mm; the radius of curvature of the object-side surface of the eighth lens element 208 is 60-70 mm, and the radius of curvature of the image-side surface is-100 to-120 mm; the object-side surface of the ninth lens 209 has a radius of curvature of 20 to 30mm, and the image-side surface has a radius of curvature of 70 to 100mm. In the above embodiment, the radius of curvature is positive, which means that the object-facing side (left) arches, and the radius of curvature is negative, which means that the image-facing side (right) arches. In other words, the object side surface is convex when the radius of curvature is positive, and concave when the radius of curvature is negative; the curvature radius of the image side surface is concave when positive, and the curvature radius is convex when negative.

Further, the thickness of the first lens 201 is 5 to 7mm; the thickness of the second lens 202 is 3.5-5 mm; the thickness of the third lens 203 is 1.2-1.8 mm; the thickness of the fourth lens 204 is 5-7 mm; the thickness of the fifth lens 205 is 1.2 to 1.8mm; the thickness of the sixth lens 206 is 4 to 6mm; the thickness of the seventh lens 207 is 4 to 6mm; the thickness of the eighth lens 208 is 4 to 6mm; the thickness of the ninth lens 209 is 4 to 6mm. It should be noted that the thickness of each lens defined above is the thickness of the lens at the position where the optical axis passes through (i.e., the center position). In alternative other embodiments, the thickness of each lens may be partially selected from the thickness definitions described above, or each lens may take on other thickness values entirely.

Further, the lens focal length f of the projection lens 200 satisfies: f is more than or equal to 8mm and less than or equal to 30mm. The lens focal length f is a combined focal length of the nine lenses of the first lens 201 to the ninth lens 209.

In the present embodiment, the relationship between the focal length of each lens and the lens focal length f of the projection lens 200 is as follows:

the focal length f1 of the first lens 201 and the lens focal length f of the projection lens 200 satisfy: f1/f is more than or equal to 1 and less than or equal to 8;

the focal length f2 of the second lens 202 and the lens focal length f of the projection lens 200 satisfy: -7.ltoreq.f2/f.ltoreq.0.5;

The focal length f3 of the third lens 203 and the lens focal length f of the projection lens 200 satisfy: -7.ltoreq.f3/f.ltoreq.0.5;

the focal length f4 of the fourth lens 204 and the lens focal length f of the projection lens 200 satisfy: f4/f is more than or equal to 0.5 and less than or equal to 7;

the focal length f5 of the fifth lens 205 and the lens focal length f of the projection lens 200 satisfy: -8.ltoreq.f5/f.ltoreq.0.5;

the focal length f6 of the sixth lens 206 and the lens focal length f of the projection lens 200 satisfy: f6/f is more than or equal to 0.5 and less than or equal to 9;

the focal length f7 of the seventh lens 207 and the lens focal length f of the projection lens 200 satisfy: f7/f is more than or equal to 0.5 and less than or equal to 6;

the focal length f8 of the eighth lens 208 and the lens focal length f of the projection lens 200 satisfy: f8/f is more than or equal to 1 and less than or equal to 7;

the focal length f9 of the ninth lens 209 and the lens focal length f of the projection lens 200 satisfy: f9/f is more than or equal to 1 and less than or equal to 7.

In alternative other embodiments, only a portion of the focal length relationship of each lens described above may be used.

Optionally, the aperture value F of the projection lens 200 satisfies: f is more than or equal to 1.4 and less than or equal to 16; in a specific embodiment, the aperture F of the projection lens 200 is 2, and a larger aperture can ensure a sufficient amount of light.

In the present embodiment, the first lens 201 to the ninth lens 209 are all glass lenses. The glass lens has low cost and better UV light resistance, so that the glass lens is more suitable for being applied to a photo-curing printer, and the service life of the lens can be ensured (while the plastic lens is easy to yellow or burn). In alternative other embodiments, especially in a use scenario where the light intensity is not high, the first lens 201 to the ninth lens 209 may be made of plastic, or partly made of plastic, and partly made of glass.

Further, the projection lens 200 further includes a diaphragm 230, and the diaphragm 230 is disposed between the fourth lens 204 and the fifth lens 205. The stop 230 may act to limit the beam edge position, and thus the field of view size.

Optionally, the wavelength band of the matching light of the projection lens 200 provided by the embodiment of the application is 350 nm-500 nm, which can be a single wavelength band or a wavelength band with a certain width in the range. The clear range of the projection surface is 0.1m to infinity.

The parameters of the projection lens 200 in one embodiment of the present application are shown in table 1.

Table 1:

in table 1, the thickness of the object plane indicates the distance (air thickness) between the object plane and the object side of the first lens 201. Each lens has two thickness values, the first (upper) thickness being the thickness of the lens itself and the second (lower) thickness being the distance (air thickness) between the lens and the latter part. The thickness value of the stop 230 refers to the distance of the stop 230 from the object side of the fifth lens 205.

When the projection lens 200 is applied to a photo-curing printer, the projection lens can be arranged at an image plane position, and the material tray is positioned at an object plane position, so that a projection image can be just projected on a printing material at the bottom of the material tray, and the printing material can be cured and molded according to the projection image.

FIG. 9 is a diagram showing the optical distortion of the projection lens 200 according to the embodiment of Table 1; fig. 10 is an MTF diagram of the projection lens 200 in the embodiment of table 1. As can be seen from fig. 9 and 10, the projection lens 200 provided in this embodiment has smaller distortion, and the MTF design value of the lens is greater than 0.7 (the lens in the prior art is generally acceptable by greater than 0.4) at a cutoff frequency of 93lp/mm, so that the resolution is stronger, and the projected characters and images are sharper.

Fig. 11 is a schematic diagram of an optical system 010 according to an embodiment of the present application. As shown in fig. 11, the optical-mechanical system 010 provided in the embodiment of the present application includes the projection device 011 provided in the foregoing embodiment. Further, the optical system 010 includes two projection devices 011, and each projection device 011 can form a projection screen on the same target imaging plane 020. It should be appreciated that in alternative other embodiments, the optical-mechanical system 010 may include more projection devices 011. By using two or more projection devices 011, two or more projection images can be formed on the target imaging surface 020, and these projection images can be spliced or superimposed. When the optical-mechanical system 010 is applied to a photo-curing printer, two or more formed projection pictures are overlapped, so that the curing speed of photo-curing materials can be accelerated, namely the printing speed is improved. The printing speed is improved by the method, the power of a single irradiation assembly 300 and the performance requirement of a single light valve are lower, so that the service life of the irradiation assembly 300 and the light valve is prolonged, and the heat dissipation requirement is reduced. And the total optical power is improved by increasing the number of the projection devices 011, so that the performance requirement on the single irradiation assembly 300 is reduced, the upper limit of the total optical power is higher, and the printing speed is easier to improve. Furthermore, if the projection pictures are stitched together, it can be used to print larger volumes of devices. In addition, the optical-mechanical system 010 is provided with a plurality of sets of projection devices 011 arranged in one device, so that the precision and consistency can be improved, the assembly process is simplified, and the printing speed and the expansibility of the breadth are improved.

The photo-curing printer (not shown in the figure) provided by the embodiment of the application comprises the optical-mechanical system 010 provided by the previous embodiment.

In summary, the present application provides a lens adjusting mechanism 100 for adjusting a position of a projection lens 200 of a photo-curing printer relative to an irradiation assembly 300, wherein the lens adjusting mechanism 100 includes a base 110 and a clamping assembly 120, and the base 110 is used for mounting the irradiation assembly 300. The clamping assembly 120 is connected to the base 110, and the clamping assembly 120 includes a frame 121, an elastic clamping member 122 disposed on the frame 121, and an adjusting member 123. The frame 121 is coupled to the base 110, and the frame 121 forms an adjustment space 127 for accommodating at least a portion of the projection lens 200. The elastic clamping member 122 is used for elastically abutting against the outer peripheral surface of the projection lens 200 located in the adjusting space 127, so as to clamp the projection lens 200 and maintain the optical axis of the projection lens 200 to extend along the first direction. One end of the adjuster 123 is used to abut against the outer peripheral surface of the projection lens 200. The projection lens 200 in the adjusting space 127 of the frame 121 can be clamped by the elastic clamping member 122, and due to the elastic property of the elastic clamping member 122, the projection lens 200 still has a certain displaceable amount in the direction perpendicular to the axial direction thereof. By adjusting the position of the adjusting member 123, the projection lens 200 can be pushed to generate displacement, and the position adjustment of the projection lens 200 can be controlled more by using the adjusting member 123 than by directly pushing or knocking the projection lens 200 by hand. Moreover, the projection lens 200 is clamped by the elastic clamping member 122, and the elastic clamping member 122 can provide resistance in the adjusting process of the projection lens 200, so that the projection lens 200 is relatively stable in the adjusting process, and the projection lens 200 is prevented from being uncontrollably displaced. When the projection lens 200 is adjusted to the proper position, the relative position of the projection lens 200 and the irradiation assembly 300 may be locked using the associated locking structure, thereby completing the adjustment. It can be seen that the position of the projection lens 200 relative to the irradiation assembly 300 can be controllably and precisely adjusted by the lens adjustment mechanism 100 provided by the present application.

The projection device 011 provided by the application comprises the lens adjusting mechanism 100, and the optical-mechanical system 010 provided by the application comprises the lens adjusting mechanism 100 of the projection device 011; the photo-curing printer provided by the application comprises the optical-mechanical system 010. Due to the use of the lens adjusting mechanism 100 provided by the application, the position of the projection lens 200 relative to the irradiation assembly 300 can be accurately adjusted, which is beneficial to improving the imaging precision of the optical system 010, thereby ensuring the printing quality.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A lens adjustment mechanism for adjusting the position of a projection lens of a photo-curing printer relative to an irradiation assembly, the lens adjustment mechanism comprising a base for mounting the irradiation assembly and a clamping assembly connected to the base, the clamping assembly comprising:

the elastic clamping piece is arranged on the frame and is used for elastically abutting against the outer peripheral surface of the projection lens in the adjusting space so as to clamp the projection lens and maintain the optical axis of the projection lens to extend along a first direction;

2. The lens adjusting mechanism according to claim 1, wherein the number of the elastic holding members is plural; the elastic clamping pieces are arranged at intervals along the circumferential direction and are used for surrounding and commonly clamping the projection lens.

3. The lens adjustment mechanism of claim 2, wherein the resilient clamping member is a spring plunger.

4. The lens adjusting mechanism according to claim 2, wherein a side of the frame facing the adjustment space is provided with a plurality of mounting holes, and the elastic clamping member is provided in the mounting holes.

5. The lens adjusting mechanism according to claim 1, wherein the number of the adjusting members is plural; each adjusting piece is arranged at intervals along the circumferential direction and is used for abutting against the projection lens from a plurality of directions perpendicular to the first direction.

6. The lens adjusting mechanism according to claim 5, wherein the number of the adjusting members is equal to the number of the elastic holders, and the adjusting members and the elastic holders are alternately arranged at intervals in a circumferential direction.

7. The lens adjusting mechanism according to claim 1, wherein the frame includes a fixing portion and a lock piece, the fixing portion is connected to the base, the fixing portion and the lock piece are detachably connected, and the fixing portion and the lock piece together enclose the adjusting space.

8. The lens adjusting mechanism according to any one of claims 1 to 7, wherein a connecting portion is provided at one end in an axial direction of the projection lens, the connecting portion being for detachably connecting with the irradiation assembly, the connecting portion being provided with a restricting chute; the frame is provided with a limiting boss, the limiting boss is used for being in sliding fit with the limiting chute so as to restrain the projection lens from translating relative to the limiting boss along a second direction, and the second direction is perpendicular to the first direction.

9. The lens adjusting mechanism according to claim 8, wherein a guide rail is provided on the frame, the guide rail extends in a third direction, the limit boss is slidably engaged with the guide rail, and the third direction is perpendicular to the first direction and the second direction.

10. The lens adjusting mechanism according to claim 9, wherein a mounting groove is formed in the frame, the guide rail is disposed in the mounting groove, a part of the limit boss is embedded in the mounting groove and is slidably matched with the guide rail, and the size of the mounting groove in the third direction is larger than the size of the limit boss in the third direction.

11. The lens adjustment mechanism of any one of claims 1-7, wherein a resilient abutment is provided on the frame for resiliently abutting the projection lens and providing the projection lens with a tendency to move towards the irradiation assembly.

12. The lens adjusting mechanism according to claim 11, wherein one end in an axial direction of the projection lens is provided with a connecting portion for detachably connecting with the irradiating unit, and the elastic abutment member is for elastically abutting against the connecting portion.

13. The lens adjustment mechanism of claim 12, wherein the resilient abutment is adapted to resiliently abut the connecting portion in the first direction.

14. The lens adjustment mechanism of claim 11, wherein the resilient abutment is a spring plunger.

15. The lens adjustment mechanism of any one of claims 1-7, wherein a locating pin is provided on the base for mating with the irradiation assembly to define the position of the irradiation assembly relative to the base.

16. The lens adjustment mechanism of any one of claims 1-7, further comprising a support base, the base being coupled to the support base, the position of the base relative to the support base being adjustable in the first direction.

17. The lens adjustment mechanism of claim 16, wherein the base is slidably connected to the support, a screw micrometer is disposed on the support, a spindle of the screw micrometer extends along the first direction, and an end of the spindle is in driving connection with the base.

18. The lens adjustment mechanism of any one of claims 1-7, wherein the adjustment member is an adjustment screw threaded to the frame.

19. A projection device, the projection device comprising:

the lens adjustment mechanism of any one of claims 1-18;

20. The projection device of claim 19, wherein the projection lens comprises, in order from an object side to an image side along an optical axis thereof:

a first lens having positive optical power;

a second lens having negative optical power;

a third lens having negative optical power;

a fourth lens having positive optical power;

a fifth lens having negative optical power;

a sixth lens having positive optical power;

a seventh lens having positive optical power;

an eighth lens having positive optical power;

a ninth lens having positive optical power;

the first lens to the ninth lens are spherical lenses.

21. The projection device of claim 20, wherein the first lens element has a convex object-side surface and a concave image-side surface;

And/or, the object side surface of the second lens is a convex surface, and the image side surface is a concave surface;

and/or, the object side surface of the sixth lens is a concave surface, and the image side surface is a convex surface;

22. The projection device of claim 20, wherein the first lens has an object-side radius of curvature of 40-50 mm and an image-side radius of curvature of 700-800 mm;

and/or the curvature radius of the object side surface of the ninth lens is 20-30 mm, and the curvature radius of the image side surface is 70-100 mm.

23. An optical-mechanical system comprising the projection device of any of claims 19-22.

24. The optical-mechanical system according to claim 23, comprising at least two of said projection devices, each of said projection devices being capable of forming a projection screen on a same target imaging surface.

25. A photo-curing printer comprising the optical-mechanical system of claim 23 or 24.