Fresnel lens assembling device

Abstract

The utility model discloses a Fresnel lens assembling device, comprising a positioning seat used for placing and limiting a gluing part; the XY-axis moving platform is connected with the positioning seat and drives the supporting platform to move in the X direction and the Y direction; the moving cavity is in sliding connection with the supporting platform in the Z direction and further provided with an injection port, and a first opening is formed in the end, close to the positioning base, of the moving cavity; the lens clamping unit is arranged at the first opening and used for clamping a Fresnel lens, and the movable cavity, the lens clamping unit and the Fresnel lens form a sealed cavity; during assembly, the moving cavity moves to drive the Fresnel lens to approach the gluing part, the sealing cavity is filled with gas or liquid through the injection port to apply pressure to the Fresnel lens, and then bonding of the Fresnel lens and the gluing part is achieved through the bonding agent attached to the gluing part or the Fresnel lens. According to the device, through a non-hard contact assembly mode, protection and uniform stress of a Fresnel lens tooth tip structure are facilitated, and the optical performance and the assembly yield of a module are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lens assembly, and particularly relates to a Fresnel lens assembly device. Background Art

[0002] At present, the mainstream optical module realizes the purpose of reducing the thickness and weight of the module through the Fresnel lens structure. The Fresnel lens is formed by removing the structural parts that do not affect the curved surface refraction and turning the curved surface into a toothed structural surface. In order to be closer to the curved surface effect, different tooth pitches, draft angles need to be matched, and the R angle of the tooth tip should be controlled within 10 um. Therefore, due to the special structure of the Fresnel lens, the existing assembly methods through profiling tooling and bearing mechanism assembly will damage the optical effective surface structure of the Fresnel lens during the gluing process. The damage to the R angle and the tooth pitch between the teeth of the Fresnel lens will directly affect the performance of the optical system and generate stray light. In addition, the pressure on the flange surface of the Fresnel lens is greater than the pressure on the central effective surface, resulting in uneven stress and uneven glue thickness, etc. Moreover, it will also cause abnormal bubbles or displacement during the film material or gluing process, reducing the assembly yield. Summary of the Utility Model

[0003] The purpose of the utility model is to propose a Fresnel lens assembly device for the above problems. Through the non-hard contact assembly method of air pressure or hydraulic pressure, it is beneficial to protect the tooth tip structure of the Fresnel lens and uniform stress, thereby improving the optical performance and assembly yield of the module.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A Fresnel lens assembly device proposed by the utility model includes a positioning seat, an XY-axis moving platform, a support platform, a moving cavity and a lens clamping unit, wherein:

[0006] The positioning seat is used to place the gluing component and limit the gluing component;

[0007] The XY-axis moving platform is connected to the positioning seat and is used to drive the support platform to move in the X direction and the Y direction;

[0008] The moving cavity is slidably connected to the support platform along the Z direction. The moving cavity is also provided with an injection port and has a first opening at one end close to the positioning seat;

[0009] The lens clamping unit is arranged at the first opening and is used to clamp the Fresnel lens. The tooth surface of the Fresnel lens faces away from the gluing component. The moving cavity, the lens clamping unit and the Fresnel lens form a sealed chamber;

[0010] During assembly, the moving cavity moves to drive the Fresnel lens closer to the bonding component, and gas or liquid is filled into the sealed chamber through the injection port to apply pressure to the Fresnel lens. Then, the adhesive attached to the bonding component or the Fresnel lens is used to bond the Fresnel lens and the bonding component.

[0011] Preferably, the support platform has a plurality of glue injection holes and a first through hole penetrating along the Z direction. The glue injection holes are communicated with the first through hole. The glue injection holes are used to inject adhesive between the Fresnel lens and the bonding component. The moving cavity is disposed inside the first through hole and can move along the axial direction of the first through hole.

[0012] Preferably, the positioning seat is provided with a stepped hole penetrating along the Z direction. The bonding component is placed in the stepped hole for X-direction and Y-direction limiting. The stepped hole and the first through hole are aligned by adjusting the XY-axis moving platform.

[0013] Preferably, the Fresnel lens assembly device further includes at least one guiding mechanism. The guiding mechanism includes a guide rod and a slider connected in a sliding manner. The guide rod is connected to the support platform and is arranged parallel to the Z axis. The slider is connected to the moving cavity.

[0014] Preferably, the support platform includes a connecting seat, a cylinder body, and at least one sliding groove. The connecting seat is connected to the XY-axis moving platform. The cylinder body is connected to the connecting seat. The sliding groove is formed on the cylinder body and is used to avoid the slider. The glue injection holes and the first through hole are both formed on the cylinder body.

[0015] Preferably, the bonding component is an optical lens or a film layer.

[0016] Preferably, the optical lens is a glass lens or a resin lens.

[0017] Preferably, the lens clamping unit is a suction pen, the gas is nitrogen, and the liquid is pure water.

[0018] Preferably, a pressure gauge for detecting the pressure inside the sealed chamber is further provided on the moving cavity.

[0019] Preferably, the XY-axis moving platform is further provided with a position detection unit for detecting the X-axis movement amount and the Y-axis movement amount. The injection port is further connected with a pipe body.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] 1) The device uses a non-hard contact assembly method with air pressure or hydraulic pressure, increasing the force-bearing area of the Fresnel lens, reducing the surface pressure, and differing from the edge-preferential force-bearing in the existing technology during flange bearing position assembly. This solution enables uniform force-bearing assembly from the direction of the Fresnel lens teeth, facilitating the protection of the Fresnel lens tooth tip structure and uniform force-bearing, solving the problems of gluing or film-bubbling caused by the warping of the Fresnel lens, thereby improving the optical performance and assembly yield of the module. It can be processed through fixtures (such as positioning seats, etc.) to meet the assembly requirements for different lens forms, and can also achieve multiple processes such as lens gluing and film pasting.

[0022] 2) The adjustment and positioning of the Fresnel lens are realized through the XY-axis moving platform, which can effectively solve the assembly positioning problem. The positioning accuracy is controlled within 0.01 mm, and a precision motor can be used to drive the moving cavity, and the assembly parameters can be quantified through a pressure gauge, with a stepping accuracy within 0.1 mm and a pressure within 0.002 Mpa, which is conducive to mass production assembly.

[0023] 3) The use of pure water or nitrogen can effectively avoid the problem of appearance pollution of the Fresnel lens and can directly enter the next process, such as the centrifugal cleaning process. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the Fresnel lens assembly device of the present utility model;

[0025] Figure 2 It is a top view of the Fresnel lens assembly device of the present utility model;

[0026] Figure 3 It is a cross-sectional view A-A of the Fresnel lens assembly device of the present utility model.

[0027] Description of the reference numerals: 1, positioning seat; 2, XY-axis moving platform; 3, support platform; 4, moving cavity; 5, guiding mechanism; 6, pipe body; 7, lens clamping unit; 8, Fresnel lens; 9, gluing component; 21, position detection unit; 31, connecting seat; 32, cylinder body; 33, sliding groove; 34, glue injection hole. Detailed Description of the Embodiment

[0028] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0029] It should be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can also be an intermediate component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0030] This device can, during the Fresnel lens assembly process, achieve the purpose of protecting the tip structure of the Fresnel lens from being damaged through a non-hard contact assembly method using air pressure or hydraulic pressure.

[0031] As Figures 1-3 shown, a Fresnel lens assembly device includes a positioning seat 1, an XY-axis moving platform 2, a support platform 3, a moving cavity 4, and a lens clamping unit 7, where:

[0032] The positioning seat 1 is used to place the gluing component 9 and limit the gluing component 9.

[0033] The XY-axis moving platform 2 is connected to the positioning seat 1 and is used to drive the support platform 3 to move in the X direction and the Y direction.

[0034] The moving cavity 4 is slidably connected to the support platform 3 in the Z direction. The moving cavity 4 is also provided with an injection port and has a first opening at one end close to the positioning seat 1.

[0035] The lens clamping unit 7 is arranged at the first opening and is used to clamp the Fresnel lens 8. The tooth surface of the Fresnel lens 8 faces away from the gluing component 9. The moving cavity 4, the lens clamping unit 7, and the Fresnel lens 8 form a sealed chamber.

[0036] During assembly, the moving cavity 4 moves to drive the Fresnel lens 8 closer to the gluing component 9, and gas or liquid is filled into the sealed chamber through the injection port to apply pressure to the Fresnel lens 8, and then the adhesive attached to the gluing component 9 or the Fresnel lens 8 is used to bond the Fresnel lens 8 and the gluing component 9.

[0037] The above X, Y, and Z directions are only three mutually perpendicular directions, and the specific orientation is not limited. For example, X and Y are horizontal directions, and Z is the vertical direction, and can also be adjusted according to actual needs. By setting different placement orientations, it is possible to select to achieve gas or liquid filling to apply pressure to the Fresnel lens 8.

[0038] Among them, the support platform 3 and the moving cavity 4 can be of any shape. The movement of the moving cavity 4 can be driven by a linear motion mechanism fixed on the support platform 3 (not shown in the figure). The linear motion mechanism can be a linear motion module in the prior art or other linear motion mechanisms well-known to those skilled in the art. Preferably, it is driven by a servo motor, which has higher precision. A through avoidance hole can be opened on the XY-axis moving platform 2 to realize the bonding of the Fresnel lens 8 and the bonding component 9, or the support platform 3 and the positioning seat 1 can be in direct contact. The adhesive is UV glue or oca glue film. When it is UV glue, it can be cured by irradiating with an ultraviolet lamp. The light of the ultraviolet lamp can penetrate through the bonding component 9 or the Fresnel lens 8 to realize curing, and the specific setting position is adjusted according to actual requirements.

[0039] This device uses a non-hard contact assembly method of air pressure or hydraulic pressure, which increases the force-bearing area of the Fresnel lens, reduces the surface pressure, and is different from the edge-first force-bearing in the flange bearing position assembly in the prior art. This solution uniformly forces the assembly from the direction of the Fresnel lens teeth, avoiding direct contact during assembly from damaging the inter-tooth structure of the Fresnel lens, which is beneficial to the protection of the tooth tip structure of the Fresnel lens and uniform force application, solving the problem of glue bubbles or film bubbles caused by the warping of the Fresnel lens, thereby improving the optical performance and assembly yield of the module, and can be processed by fixtures (such as positioning seats, etc.) to meet the assembly requirements of different lens forms, and realize multiple processes such as lens gluing and film pasting; and the adjustment and positioning of the Fresnel lens are realized through the XY-axis moving platform, which can effectively solve the assembly positioning problem, with the positioning accuracy controlled within 0.01 mm, and a precision motor can be used to drive the moving cavity and the assembly parameters can be quantified through a pressure gauge, with the stepping accuracy within 0.1 mm and the pressure within 0.002 Mpa, which is beneficial to mass production assembly.

[0040] In one embodiment, the support platform 3 has a plurality of glue injection holes 34 and a first through hole penetrating along the Z direction. The glue injection holes 34 are communicated with the first through hole. The glue injection holes 34 are used to inject an adhesive between the Fresnel lens 8 and the bonding component 9. The moving cavity 4 is placed inside the first through hole and can move along the axial direction of the first through hole. Preferably, the glue injection holes 34 are symmetrically distributed. For example, there are two, and the specific quantity can be adjusted according to actual requirements.

[0041] In one embodiment, the positioning seat 1 is provided with a stepped hole penetrating along the Z direction. The bonding component 9 is placed in the stepped hole for X-direction and Y-direction limiting. The stepped hole and the first through hole are adjusted to be centered through the XY-axis moving platform 2. The stepped hole can be adaptively adjusted according to the shape of different bonding components 9 to adapt to different optical lenses or film layers.

[0042] In one embodiment, the Fresnel lens assembly device further includes at least one guiding mechanism 5. The guiding mechanism 5 includes a guide rod and a slider that are slidably connected. The guide rod is connected to the support platform 3 and is arranged parallel to the Z-axis, and the slider is connected to the moving cavity 4. The sliding connection between the support platform 3 and the moving cavity 4 realized by the guiding mechanism 5 is beneficial to achieving accurate positioning. Preferably, the guiding mechanisms 5 are symmetrically distributed. For example, there are two of them, and the specific number can be adjusted according to actual needs.

[0043] In one embodiment, the support platform 3 includes a connecting seat 31, a cylinder body 32, and at least one chute 33. The connecting seat 31 is connected to the XY-axis moving platform 2, the cylinder body 32 is connected to the connecting seat 31, the chute 33 is opened on the cylinder body 32 and is used to avoid the slider, and the glue injection hole 34 and the first through hole are both opened on the cylinder body 32. The sealing and dust prevention during the assembly process are realized through the cylinder body 32, which helps to ensure the cleanliness and yield of the assembly module.

[0044] In one embodiment, the gluing component 9 is an optical lens or a film layer. Multiple processes such as lens gluing and film pasting can be realized, and the application range is wide. The film layer can be a reflective film, an anti-reflection film, etc.

[0045] In one embodiment, the optical lens is a glass lens or a resin lens. If the resin lens is a COC resin lens or a COP resin lens, it is easy to think that the optical lens can also be other lenses well-known to those skilled in the art.

[0046] In one embodiment, the lens clamping unit 7 is a suction pen, the gas is nitrogen, and the liquid is pure water. The outer ring wall of the Fresnel lens 8 is adsorbed by the suction pen. The suction pen can be a structure adapted to the lens in the prior art, or a ring-shaped suction pen. For example, an annular adsorption groove or several adsorption holes are opened on the flange ring structure to realize the adsorption of the Fresnel lens 8, and different adsorption force requirements of the Fresnel lens 8 are realized by adjusting the suction force. By using pure water or nitrogen, the problem of appearance pollution of the Fresnel lens can be effectively avoided, and it can directly enter the next process, such as the centrifugal cleaning process.

[0047] In one embodiment, a pressure gauge for detecting the pressure in the sealed chamber is further provided on the moving cavity 4. It is beneficial to apply pressure accurately and avoid damaging the lens or poor bonding.

[0048] In one embodiment, the XY-axis moving platform 2 is further provided with a position detection unit 21 for detecting the X-axis movement amount and the Y-axis movement amount, and the injection port is further connected to a pipe body 6. The accurate docking of the Fresnel lens 8 and the gluing component 9 is realized through the position detection unit 21, which is beneficial to improving the yield and ensuring the optical performance.

[0049] Working principle:

[0050] During assembly, the moving cavity 4 moves upward. The gluing component 9 is placed into the positioning seat 1, and the Fresnel lens 8 is placed into the lens clamping unit 7 for adsorption. Then, UV glue is injected onto the gluing component 9 through the glue injection hole 34. The moving cavity 4 moves along the Z direction to drive the Fresnel lens 8 close to the gluing component 9, and gas or liquid is filled into the sealed chamber through the injection port to uniformly press the Fresnel lens 8. Then, UV curing of the Fresnel lens 8 is performed to complete the bonding of the Fresnel lens 8 and the gluing component 9, realizing the assembly operation of the Fresnel lens module. The moving cavity 4 moves upward and opens, and then the Fresnel lens module can be taken out. The above operations are repeated to assemble the next Fresnel lens 8.

[0051] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0052] The above-described embodiments only represent the embodiments of the present application that are described in more specific and detailed manners, but should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A Fresnel lens assembly device, characterized in that: The Fresnel lens assembly device includes a positioning seat (1), an XY-axis moving platform (2), a support platform (3), a moving cavity (4), and a lens clamping unit (7), where: The positioning seat (1) is used to place the gluing component (9) and limit the gluing component (9); The XY-axis moving platform (2) is connected to the positioning seat (1) and is used to drive the support platform (3) to move in the X direction and the Y direction; The moving cavity (4) is slidably connected to the support platform (3) in the Z direction. The moving cavity (4) is also provided with an injection port and has a first opening at one end close to the positioning seat (1); The lens clamping unit (7) is arranged at the first opening and is used to clamp the Fresnel lens (8). The tooth surface of the Fresnel lens (8) faces away from the gluing component (9). The moving cavity (4), the lens clamping unit (7), and the Fresnel lens (8) form a sealed chamber; During assembly, the moving cavity (4) moves to drive the Fresnel lens (8) close to the gluing component (9), and gas or liquid is filled into the sealed chamber through the injection port to press the Fresnel lens (8), and then the adhesive attached to the gluing component (9) or the Fresnel lens (8) realizes the bonding of the Fresnel lens (8) and the gluing component (9).

2. The Fresnel lens assembly device according to claim 1, characterized in that: The support platform (3) has a plurality of glue injection holes (34) and a first through hole penetrating in the Z direction. The glue injection holes (34) are communicated with the first through hole. The glue injection holes (34) are used to inject adhesive between the Fresnel lens (8) and the gluing component (9). The moving cavity (4) is placed in the first through hole and can move along the axial direction of the first through hole.

3. The Fresnel lens assembly device according to claim 2, characterized in that: The positioning seat (1) is provided with a stepped hole penetrating in the Z direction. The gluing component (9) is placed in the stepped hole for X-direction and Y-direction limiting. The stepped hole and the first through hole are adjusted to be centered by the XY-axis moving platform (2).

4. The Fresnel lens assembly device according to claim 2, wherein: The Fresnel lens assembly device further includes at least one guiding mechanism (5). The guiding mechanism (5) includes a guide rod and a slider connected in a sliding manner. The guide rod is connected to the support platform (3) and is arranged parallel to the Z axis. The slider is connected to the moving cavity (4).

5. The Fresnel lens assembly device according to claim 4, characterized in that: The support platform (3) includes a connecting seat (31), a cylinder body (32), and at least one chute (33). The connecting seat (31) is connected to the XY-axis moving platform (2). The cylinder body (32) is connected to the connecting seat (31). The chute (33) is opened on the cylinder body (32) and is used to avoid the slider. The glue injection holes (34) and the first through hole are both opened on the cylinder body (32).

6. The Fresnel lens assembly device according to claim 1, wherein: The gluing component (9) is an optical lens or a film layer.

7. The Fresnel lens assembly device according to claim 6, characterized in that: The optical lens is a glass lens or a resin lens.

8. The Fresnel lens assembly device according to claim 1, characterized in that: The lens clamping unit (7) is a suction pen. The gas is nitrogen, and the liquid is pure water.

9. The Fresnel lens assembly device according to claim 1, wherein: The moving cavity (4) is also provided with a pressure gauge for detecting the pressure in the sealed chamber.

10. The Fresnel lens assembly device according to claim 1, characterized in that: The XY-axis moving platform (2) is further provided with a position detection unit (21) for detecting the X-axis movement amount and the Y-axis movement amount, and the injection port is further connected with a pipe body (6).

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