Micro stress lens press-fit structure and press-fit method

Abstract

The present application relates to a kind of micro stress lens press mounting structure and press mounting method, belong to optical technology field, structure includes pressing block, force balance piece, force applying piece and stress buffer piece, the first end of pressing block corresponds the surface of frame and is set, its second end extends to lens surface;Force balance piece is located between the first end of pressing block and its second end;Force applying piece is through pressing block and force balance piece after with frame can be detachably connected;Stress buffer piece is located between the second end of pressing block and lens surface, the total thickness of stress buffer piece and the second end of pressing block is less than the thickness of the first end of pressing block, the present application can solve the problems, such as uneven stress of lens, easy to damage optical surface, poor anti-vibration performance etc. while realizing lens fixation in prior art.

Description

Technical Field

[0001] This invention belongs to the field of optical technology, and specifically relates to a micro-stress lens pressing structure and pressing method. Background Technology

[0002] In optical systems, the mounting accuracy of lenses directly affects their imaging performance and system stability. Lens press-fitting is a common method of lens fixing. It involves applying a certain prestress between the lens and the lens mount to firmly fix the lens to the mount, while using pressure rings or plates to restrict the lens's axial and radial degrees of freedom (usually 2 to 3 directions) to achieve stable support and prevent loosening.

[0003] Currently, the common lens pressing methods mainly include the following:

[0004] 1. Direct installation method using pressure rings: such as Figure 1 As shown, this method uses a pressure ring with external threads. By rotating the pressure ring, it moves axially, thereby pressing the lens onto the lens mount. This structure is simple, but it has obvious drawbacks: because the thread has a lead angle, a combination of axial and circumferential motion occurs between the pressure ring and the lens surface during tightening, resulting in uneven contact between the pressure ring and the lens. Furthermore, the tightening process can easily cause frictional damage to the lens surface (especially the coating layer), affecting optical performance.

[0005] 2. Assembly method of pressure ring and pressure plate: such as Figure 2 As shown, this structure has a through hole in the pressure ring, and a pressure plate is placed between the pressure ring and the lens. A screw passes through the through hole in the pressure ring and is screwed into the lens mount. The axial preload of the screw pushes the pressure plate to press the lens. However, due to dimensional tolerances during processing and assembly, a certain gap usually needs to be reserved between the pressure ring and the lens frame to ensure assembly feasibility. If the contact point between the pressure plate and the lens is considered as a fulcrum, although the clamping force applied by the screw and the reaction force of the pressure plate can be balanced in magnitude, the resulting torque is difficult to completely cancel out, resulting in a complex and uncertain actual position and stress state of the pressure plate. This uncertainty will further cause uneven stress on various pressure points of the lens, resulting in lens surface distortion and affecting image quality. In addition, under vibration or impact conditions, the screw is prone to loosening, leading to loss of preload and thus affecting system reliability.

[0006] 3. Semi-kinematic elastic compression plate installation method: such as Figure 3As shown, the mode adopts a tablet structure with elasticity, an initial displacement is applied by a screw, the elastic tablet is deformed, and the elastic restoring force is used to apply a continuous pressing force on the lens. Although this mode can alleviate the stress concentration problem caused by rigid contact to a certain extent, its performance is highly dependent on the stiffness design and pre-deformation control of the elastic tablet: on the one hand, the tablet needs to have sufficient stiffness to resist external vibration and impact; on the other hand, the pre-deformation amount must be accurately controlled to ensure that the pre-stress on the lens is within a reasonable range, avoiding lens breakage or surface distortion due to excessive stress. In order to achieve accurate assembly, the installation position of the tablet on the frame usually needs to be matched and ground to ensure the relative height between the tablet and the lens, which not only increases the processing cost, but also increases the assembly difficulty and process complexity. SUMMARY

[0007] In view of various deficiencies of the prior art, a micro-stress lens press-fitting structure and a press-fitting method are proposed to solve the problems of uneven stress on the lens, easy damage to the optical surface, poor vibration resistance and other problems in the prior art when fixing the lens, which is difficult to meet the stringent requirements of high-precision and high-stability optical systems on lens installation.

[0008] To achieve the above object, the present application provides the following technical scheme:

[0009] In a first aspect, the present application provides a micro-stress lens press-fitting structure, comprising:

[0010] a pressing block, a first end portion of which is arranged corresponding to a frame surface, and a second end portion of which extends to a lens surface;

[0011] a force balancing member, which is located between the first end portion and the second end portion of the pressing block, and which is located between the pressing block and the frame surface;

[0012] a force applying member, which is detachably connected with the frame after penetrating through the pressing block and the force balancing member;

[0013] and a stress buffer member, which is located between the second end portion of the pressing block and the lens surface, and the total thickness of the stress buffer member and the second end portion of the pressing block is less than the thickness of the first end portion of the pressing block.

[0014] The technical scheme is further provided that the first end portion of the pressing block is provided with a pressing block protrusion protruding from the body thereof and protruding towards the frame surface, and the total thickness of the pressing block protrusion and the body of the pressing block serves as the thickness of the first end portion of the pressing block.

[0015] The technical scheme is further provided with the end of the pressing block protruding and abutting against the surface of the frame, the abutting position serving as a lever fulcrum, the force applying member providing a pre-tightening force as a power, the distance from the center of the force applying member to the lever fulcrum serving as a power arm, the stress buffer deforming under the action of the pre-tightening force to generate a deformation force as a resistance, the distance from the center of the stress buffer to the lever fulcrum serving as a resistance arm, the resistance arm being greater than the power arm, and the micro-stress lens pressing structure being in a torque balance state.

[0016] The technical scheme is further provided with the first end of the pressing block being located in the clamping groove of the frame, the first end of the pressing block abutting against the side wall of the clamping groove in the length direction of the pressing block, and the length direction being the direction from the first end of the pressing block to the second end thereof.

[0017] The pressing block and the clamping groove are gap-fitted in the width direction of the pressing block.

[0018] The technical scheme is further provided with the total thickness of the force balance member and the pressing block part above the force balance member being between the thickness of the first end of the pressing block and the total thickness of the stress buffer and the second end of the pressing block when the force balance member is not stressed, and the force balance member elastically deforming to generate an elastic force balancing the pre-tightening force provided by the force applying member when the force balance member is stressed.

[0019] The technical scheme is further provided with the stress buffer elastically deforming when stressed, the second end of the pressing block being provided with a mounting hole, and the stress buffer being provided with a buffer protrusion embedded in the mounting hole.

[0020] The thickness of the stress buffer protruding from the second end of the pressing block serves as the thickness of the stress buffer when the stress buffer is not stressed.

[0021] The technical scheme is further provided with the stress buffer plastically deforming when stressed, and the stress buffer being plated on the second end of the pressing block.

[0022] In a second aspect, the application provides a micro-stress lens pressing method, comprising the following steps:

[0023] S100, placing a lens in a frame and mounting the assembled lens and frame assembly on an interferometer;

[0024] S200, mounting a stress buffer on the second end of a pressing block, placing a force balance member and a pressing block in sequence on the surface of the frame, and making the stress buffer contact the surface of the lens;

[0025] S300, mounting a force applying member, the first end of the pressing block contacting the surface of the frame, the stress buffer separating from the surface of the lens, and rotating the force applying member to drive the pressing block to apply a pre-tightening force to the frame;

[0026] S400, observing the lens wave surface difference displayed by the interferometer, when the lens wave surface difference starts to change, stopping the rotation of the force applying member, and completing the lens press fitting.

[0027] The technical solution is further provided that, in step S300, during the process that the rotation force applying member drives the pressing block to apply the pre-tightening force to the frame, the pressing block contacts the force balancing member and applies pressure to it, so that the force balancing member is elastically deformed to generate an elastic force in the opposite direction of the pre-tightening force, and during the process, the distance between the stress buffer member and the lens surface gradually decreases.

[0028] The technical solution is further provided that, in step S400, when the distance between the stress buffer member and the lens surface decreases to zero, the lens starts to bear the contact stress from the stress buffer member, which causes the wave surface difference to change, at this time, it is determined that the stress buffer member is at the press fitting critical point, the rotation of the force applying member is stopped, and the lens press fitting is completed.

[0029] The beneficial effects of the present application are:

[0030] 1. The first end of the pressing block contacts the frame surface to form a lever fulcrum, the rotation force applying member can apply a pre-tightening force to the frame by pressing the pressing block, as the force applying member is gradually tightened, the force balancing member starts to deform to generate an upward elastic force to balance the pre-tightening force, the stress buffer member acts as a buffer layer to reduce the hard impact caused by the second end of the pressing block directly contacting the lens, and increases the contact area to make the pressure distribution more uniform. As the pressing block continues to press down, at the moment when the stress buffer member first contacts the lens surface, the wave surface difference of the lens surface displayed by the interferometer changes, so as to determine whether the stress buffer member reaches the critical point. At this time, if the pressing block continues to press down, due to the deformable characteristics of the stress buffer member, an upward deformation force will be generated, forming a kind of effortful lever mechanism. In this way, the ideal pressure value can be gradually approached without damaging the lens surface, so as to realize micro-pressure or even zero-pressure press fitting, and avoid the problems of lens surface damage and imaging quality decline caused by excessive contact stress.

[0031] 2. The force applying member continuously receives the elastic force from the force balancing member after assembly, which not only helps to maintain the stability of the lens position, but also increases the anti-looseness function, improves the stability of the overall structure, and reduces the risk of looseness caused by vibration. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A schematic diagram of the press ring installation method adopted by the prior art;

[0033] Figure 2 A schematic diagram of the press ring and press piece installation method adopted by the prior art;

[0034] Figure 3 Schematic diagram of semi-kinematic mounting method adopted by prior art;

[0035] Figure 4 Top view of micro-stress lens press-fitting structure in embodiment of the present application;

[0036] Figure 5 Top view of micro-stress lens press-fitting structure in embodiment of the present application; Figure 4 A-A sectional view in the middle;

[0037] Figure 6 Top view of press block in embodiment of the present application;

[0038] Figure 7 Top view of press block in embodiment of the present application; Figure 6 B-B sectional view in the middle;

[0039] Figure 8 Top view of micro-stress lens press-fitting structure in another embodiment of the present application;

[0040] Figure 9 Schematic diagram of one embodiment of press block protrusion in embodiment of the present application;

[0041] Figure 10 Schematic diagram of another embodiment of press block protrusion in embodiment of the present application;

[0042] Figure 11 Schematic diagram of another embodiment of press block protrusion in embodiment of the present application;

[0043] Figure 12 Schematic diagram of another embodiment of press block protrusion in embodiment of the present application;

[0044] Figure 13 Schematic diagram of another embodiment of press block protrusion in embodiment of the present application;

[0045] Figure 14 Schematic diagram of another embodiment of stress buffer in embodiment of the present application;

[0046] Figure 15 Flow chart of lens press-fitting method in embodiment of the present application;

[0047] Figure 16 Schematic diagram of effort lever in embodiment of the present application.

[0048] In the drawings: 1, lens; 2, lens frame; 3, press block; 4, force applying member; 5, mounting hole; 6, stress buffer; 7, force balancing member; 8, through hole; 9, press block protrusion; 10, buffer protrusion. DETAILED DESCRIPTION

[0049] In order for the personnel in the art to better understand the technical solutions of the present application, the technical solutions of the present application are described clearly and completely below in combination with the drawings of the present application. Based on the embodiments in the present application, other similar embodiments obtained by the personnel in the art without creative labor should all belong to the scope of protection of the present application. In addition, the directional words mentioned in the following embodiments, such as “up”, “down”, “left”, “right” and the like are only the directions of the drawings, therefore, the directional words used are used for illustration and not for limiting the present application.

[0050] Embodiment one:

[0051] According to the embodiment of the present application, a micro-stress lens press-fit structure is provided, please refer to Figures 4 to 7 , which comprises a press block 3, a force balance piece 7, a force applying piece 4 and a stress buffer piece 6, wherein the first end of the press block 3 is arranged corresponding to the surface of the frame 2, and the second end thereof extends to the surface of the lens 1; the force balance piece 7 is located between the first end and the second end of the press block 3, and is located between the press block 3 and the surface of the frame 2; the force applying piece 4 is connected to the frame 2 detachably after penetrating through the press block 3 and the force balance piece 7; the stress buffer piece 6 is located between the second end of the press block 3 and the surface of the lens 1, and the total thickness of the stress buffer piece 6 and the second end of the press block 3 is less than the thickness of the first end of the press block 3, so that the first end of the press block 3 is in contact with the surface of the frame 2 first to form a lever fulcrum during assembly.

[0052] Further, the lens 1 is installed in the frame 2, and the lower surface of the lens 1 is in contact with the convex edge of the frame 2.

[0053] Further, when the force balance piece 7 is not under stress, the total thickness thereof and the press block part located above the force balance piece is between the thickness of the first end of the press block 3 and the total thickness of the stress buffer piece 6 and the second end of the press block 3; when the force balance piece 7 is under stress, it is elastically deformed to generate an elastic force which is balanced with the pre-tightening force provided by the force applying piece 4.

[0054] Preferably, the force balance piece 7 adopts a high-rigidity disc spring to achieve a larger elastic force in a smaller space. In addition, the force balance piece 7 can also adopt a spiral spring or a magnetic counter-force structure, as long as the force balance mechanism is achieved. Specifically, the magnetic counter-force structure is composed of two same-pole opposite permanent magnets, one of which is fixed at the bottom of the press block 3, and the other of which is installed on the surface of the frame 2. When the force applying piece 4 is pressed down, the distance between the two magnets decreases, and the magnetic repulsion force increases, thereby generating an elastic force similar to a disc spring. The magnets of this structure can adopt high-energy permanent magnet materials such as neodymium iron boron.

[0055] It can be understood that the first end of the pressing block 3 is in contact with the surface of the frame 2 to form a lever fulcrum, and the pressing of the pressing block 3 by the rotating force applying member 4 can apply a pre-tightening force to the frame 2. As the force applying member 4 is gradually tightened, the force balancing member 7 begins to deform, generating an upward elastic force to balance the pre-tightening force. The stress buffer 6 acts as a buffer layer to reduce the hard impact caused by the direct contact of the second end of the pressing block 3 with the lens 1, and increases the contact area to make the pressure distribution more uniform. As the pressing block 3 continues to be pressed down, at the moment when the stress buffer 6 first contacts the surface of the lens 1, the wavefront difference of the mirror surface displayed by the interferometer changes, so as to determine whether the stress buffer 6 has reached the critical point. At this time, if the pressing block 3 continues to be pressed down, due to the deformable nature of the stress buffer 6 itself, an upward deformation force will be generated, forming a kind of effortful lever mechanism. In this way, the ideal pressure value can be gradually approached without damaging the surface of the lens 1, so as to realize micro-pressure or even zero-pressure pressing, thereby avoiding the problems of surface damage and imaging quality degradation of the lens 1 caused by excessive contact stress.

[0056] In the micro-stress lens pressing structure of the present embodiment, please refer to Figures 4 to 7 , the first end of the pressing block 3 is provided with a pressing block protrusion 9 protruding from the body and protruding towards the surface of the frame 2, and the total thickness of the pressing block protrusion 9 and the body of the pressing block is the thickness h1 of the first end of the pressing block 3.

[0057] It can be understood that the function of the pressing block protrusion 9 is to increase the overall thickness of the first end of the pressing block 3, which helps to ensure that when the force applying member 4 starts to tighten, the first end of the pressing block 3 can first contact the frame 2 to form an effective lever fulcrum, thereby allowing the pressure applied to the stress buffer 6 and the lens 1 to be controlled by adjusting the force applying member 4.

[0058] Further, the pressing block protrusion 9 can be integrally formed with the pressing block 3, or can adopt a split structure, providing more design selection space, which can adjust the design scheme according to actual needs, such as changing the shape, size or setting position of the pressing block protrusion 9, etc., to adapt to different application scenarios.

[0059] Specifically, please refer to Figure 7 , the end of the pressing block protrusion 9 is designed as a flat surface, which is the end of the pressing block protrusion 9 in contact with the surface of the frame 2. The flat end can provide a larger contact area, which helps to evenly distribute the pressure applied to the frame 2 and reduce local stress concentration. Due to its relatively large contact surface, it can provide better stability and reduce displacement caused by external vibration or impact. The flat end is relatively easy to process and has a lower cost.

[0060] Specifically, please refer to Figure 9The end of the pressing block protrusion 9 is designed as an arc surface. Compared to a flat end, the arc surface provides a more concentrated force point, which is suitable for applications that require more precise control of pressure distribution. For certain specific design requirements, such as the need to apply greater pressure in a smaller area, the arc surface structure at the end is a better choice.

[0061] Specifically, please refer to Figure 10 The end of the pressing block protrusion 9 is designed as a hyperbolic arc surface. The hyperbolic arc surface can more naturally disperse pressure and reduce stress concentration, thereby better protecting the surface of the frame 2 from damage. This shape can automatically adjust the pressure distribution to a certain extent to achieve a state of dynamic balance, so that the frame 2 can maintain good contact state when subjected to pressure in different directions. The design and manufacture of the hyperbolic arc surface are relatively complex, resulting in higher production costs, but its unique advantage is that it can provide better support for high-precision applications.

[0062] Specifically, please refer to Figure 11 The pressing block protrusion 9 is symmetrically arranged in two, and the cross section of each pressing block protrusion 9 is rectangular. The double pressing block protrusion structure can significantly increase the stability of the entire structure, and this design can more evenly distribute pressure and reduce the phenomenon of deflection or imbalance caused by single-point stress, which helps to achieve more uniform pressure distribution and effectively prevent damage to the frame 2 caused by local stress concentration. The two symmetrically arranged pressing block protrusions 9 can better resist the influence of external vibration and improve the anti-interference ability to maintain the stability of the position of the pressing block 3. Although better stability and uniformity are provided, the complexity of assembly is increased, and it is necessary to ensure that both pressing block protrusions 9 can accurately contact and apply appropriate pressure.

[0063] Specifically, please refer to Figure 12 The pressing block protrusion 9 is arranged as one, and the ends of the pressing block protrusion 9 extend to the front and rear ends of the pressing block 3, which means that it has a larger contact area on the frame 2. A larger contact area can help to disperse pressure, reduce local stress concentration, thereby reducing the risk of damage to the frame 2, and also help to disperse pressure and provide a more stable foundation to prevent position deviation or loosening due to external vibration or other external forces. It should be noted that the side surface of the pressing block protrusion 9 near the second end of the pressing block 3 is designed as an arc side surface, which can provide additional support and increase the stability of the entire pressing structure. This design can help prevent position deviation or loosening due to external vibration or other external forces.

[0064] Specifically, please refer to Figure 13, the protrusion 9 is arranged on the center line of the pressing block 3, and the protrusion 9 does not extend to the front and rear ends of the pressing block 3. The design of the single protrusion 9 simplifies the overall structure, reduces the manufacturing cost, and makes the assembly process more simple and convenient. This design structure will concentrate the pressure and is suitable for application scenarios that require higher pressing force in a specific area. When facing vibration or other external forces, the stability of the single protrusion 9 is relatively poor.

[0065] In the micro-stress lens pressing structure of the embodiment, as shown in Figures 4 to 7 , the end of the protrusion 9 abuts against the surface of the frame 2, and the abutting position serves as a lever fulcrum. The force applying member 4 provides a pre-tightening force as a power, and the distance from the center of the force applying member 4 to the lever fulcrum serves as a power arm L1. The stress buffer 6 deforms under the action of the pre-tightening force to generate a deformation force as a resistance. The distance from the center of the stress buffer 6 to the lever fulcrum serves as a resistance arm L2, and the resistance arm is greater than the power arm. The micro-stress lens pressing structure is in a state of moment balance.

[0066] It can be understood that the protrusion 9, the force applying member 4, and the stress buffer 6 constitute a force lever. The movement distance (stroke) of the input end (the force applying member 4) is smaller than that of the output end (the stress buffer 6), which amplifies the displacement / movement range of the output end. Specifically, in the force lever, the ratio of the input end displacement S1 to the output end displacement S2 is determined by the lever arm length:

[0067] , and it is obtained that Since L2>L1, S2 is greater than S1. That is, the force applying member 4 is pressed by a small distance S1, and the stress buffer 6 is pressed to the lens 1 with a larger stroke S2, which helps to accurately control the slowness and uniformity of the contact between the stress buffer 6 and the lens 1, and avoids the instantaneous impact force causing stress concentration of the lens 1.

[0068] Specifically, the force applying member 4 adopts a screw, and a through hole 8 is formed in the pressing block 3. The screw penetrates through the through hole 8 and the force balance member 7 and is threadedly connected with the frame 2. Preferably, the screw and the frame 2 are matched with a fine thread, and the pitch is ≤0.5mm, which improves the adjustment accuracy of the screw.

[0069] In the micro-stress lens pressing structure of the embodiment, as shown in Figures 4 to 7 , the first end of the pressing block 3 is located in the clamping groove of the frame 2. In the length direction of the pressing block 3, the first end of the pressing block 3 abuts against the side wall of the clamping groove. The length direction is the direction from the first end to the second end of the pressing block 3.

[0070] In the width direction of the pressing block 3, the pressing block 3 is matched with the card slot gap to inhibit the rotating movement of the pressing block 3 caused by the friction when the twisting force element 4 is twisted.

[0071] It should be noted that the present application can not only realize the pressing of square lenses, please refer to Figure 4 ; the present application can also realize the pressing of circular lenses, please refer to Figure 8 At this time, the pressing block 3 is provided in a fan shape. For circular lenses, the fan-shaped pressing block can maximize the reduction of the requirement for the surrounding space while ensuring sufficient contact area. This design is particularly suitable for compact optical devices or application scenarios requiring high-density integration.

[0072] In the micro-stress lens pressing structure of the present embodiment, please refer to Figures 4 to 7 , the stress buffer 6 produces elastic deformation when stressed, the second end of the pressing block 3 is provided with a mounting hole 5, and the stress buffer 6 is provided with a buffer protrusion 10 embedded in the mounting hole 5;

[0073] When the stress buffer 6 is not stressed, the thickness of the protruding second end of the pressing block 3 serves as the thickness of the stress buffer 6, the sum of the thickness of the stress buffer 6 and the second end thickness of the pressing block 3 is denoted as h2, and the first end thickness of the pressing block 3 is denoted as h1, then . Preferably, the difference between the two is between 0.05mm-0.25mm, which ensures that the effort lever is close to the horizontal state, and the difference between the two is the basis for realizing the balance of the effort lever.

[0074] Specifically, the stress buffer 6 is made of soft pads made of silicone rubber, polyurethane elastomer, or fluororubber.

[0075] In the micro-stress lens pressing structure of the present embodiment, please refer to Figure 14 , the stress buffer 6 produces plastic deformation when stressed, and the stress buffer 6 is plated on the second end of the pressing block 3.

[0076] Specifically, the stress buffer 6 is made of a copper plating layer. The ductility of copper allows it to produce plastic deformation through lattice slipping at the microscale, thereby absorbing local stress. The stress buffer 6 can also be made of a gold plating layer.

[0077] Embodiment two:

[0078] The present application provides a lens pressing method, please refer to Figures 4 to 15 , comprising the following steps:

[0079] S100, place the lens 1 in the frame 2, and install the assembled lens 1 and frame 2 assembly on the interferometer;

[0080] S200, install the stress buffer 6 on the second end of the pressing block 3, place the force balance 7 and the pressing block 3 on the surface of the frame 2 in turn, and make the stress buffer 6 contact with the surface of the lens 1;

[0081] S300, install the force applying part 4, the first end of the pressing block 3 contacts with the surface of the frame 2, the stress buffer 6 is separated from the surface of the lens 1, rotate the force applying part 4 to drive the pressing block 3 to apply a pre-tightening force to the frame 2;

[0082] S400, observe the wave surface difference of the lens displayed by the interferometer, when the wave surface difference of the lens begins to change, stop rotating the force applying part 4, and complete the lens pressing.

[0083] Further, in the step S300, during the process that the force applying part 4 drives the pressing block 3 to apply a pre-tightening force to the frame 2, the pressing block 3 contacts with the force balance 7 and applies a pressure to it, so that the force balance 7 is elastically deformed and generates an elastic force in the direction opposite to the pre-tightening force, and during the process, the distance between the stress buffer 6 and the surface of the lens 1 gradually decreases.

[0084] Further, in the step S400, when the distance between the stress buffer 6 and the surface of the lens 1 decreases to zero, the lens 1 begins to bear the contact stress from the stress buffer 6, which causes the wave surface difference to change, at this time, it is determined that the stress buffer 6 is at the pressing critical point, and the rotation of the force applying part 4 is stopped, and the lens pressing is completed.

[0085] It can be understood that when the stress buffer 6 is at the pressing critical point, the pre-tightening force of the force applying part 4 and the elastic force of the force balance 7 can still be balanced. If the pressing block 3 is continuously pressed down, due to the deformable characteristics of the stress buffer 6 itself, an upward deformation force will be generated, forming a force-lever mechanism, please refer to Figure 16 By observing the wave surface difference of the lens, the height of the force applying part 4 is fine-tuned, so as to realize the micro-pressure (the change of the wave surface difference is not more than 2%) or zero-pressure installation of the lens 1. After the assembly is completed, the force applying part 4 continuously bears the elastic force from the force balance 7. This design not only helps to keep the position of the lens 1 stable, but also increases the anti-loose function, improves the stability of the overall structure, and reduces the risk of loosening caused by vibration.

[0086] It should be noted that, please refer to Figures 2 to 3 , when the traditional scheme directly presses by using the screw (force applying part), the stress increment borne by the lens is equal to the pre-tightening force of the force applying part . In the force-lever mechanism, it can be known from the lever balance condition that:

[0087] , is the deformation force generated by the deformation of the stress buffer 6, and it can be further obtained that .

[0088] Stress on lens 1 The stress on lens 1 is equal to the force transmitted by stress buffer 6, and thus:

[0089] Compared with the traditional scheme, it is concluded that That is, under the condition of the same pre-tightening force, the force lever structure of the present application reduces the stress on lens 1 to Thus, micro-pressure or even zero-pressure installation is achieved.

[0090] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and in the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0091] Optionally, specific examples in the present embodiment can refer to examples described in the above-described embodiments, and the present embodiment will not be repeated here.

[0092] The above-mentioned sequence numbers of the embodiments of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

[0093] In the above-described embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0094] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A micro-stress lens press-fitting structure, characterized in that, include: The pressure block has a first end that corresponds to the surface of the eyeglass frame and a second end that extends to the surface of the lens. A force balancing component is located between the first end and the second end of the pressure block, and between the pressure block and the surface of the mirror frame; The force-applying component passes through the pressure block and the force-balancing component and is detachably connected to the mirror frame; And a stress buffer, which is located between the second end of the pressure block and the surface of the lens, wherein the total thickness of the stress buffer and the second end of the pressure block is less than the thickness of the first end of the pressure block; During the pressing process, the first end of the pressure block contacts the lens frame surface to form a lever fulcrum. Rotating the force-applying component and pressing down the pressure block can apply a preload to the lens frame. As the force-applying component gradually tightens, the force balance component begins to deform, generating an upward elastic force to balance the preload. The stress buffer acts as a buffer layer to reduce the hard impact caused by the second end of the pressure block directly contacting the lens and to increase the contact area, making the pressure distribution more uniform. As the pressure block continues to press down, at the instant when the stress buffer just begins to contact the lens surface, the phase difference of the mirror wavefront displayed by the interferometer changes, thereby determining whether the stress buffer has reached the critical point.

2. The micro-stress lens pressing structure according to claim 1, characterized in that, The first end of the pressure block is provided with a pressure block protrusion that protrudes from its body and towards the surface of the frame. The total thickness of the pressure block protrusion and the pressure block body is the thickness of the first end of the pressure block.

3. The micro-stress lens press-fitting structure according to claim 2, characterized in that, The end of the protruding pressure block abuts against the surface of the lens frame, and this abutment point serves as a lever fulcrum. The force-applying component provides a preload as a driving force, and the distance from the center of the force-applying component to the lever fulcrum serves as the driving force arm. The stress buffer deforms under the action of the preload, generating a deformation force as a resistance. The distance from the center of the stress buffer to the lever fulcrum serves as the resistance arm, and the resistance arm is greater than the driving force arm. The micro-stress lens pressing structure is in a state of torque balance.

4. The micro-stress lens press-fitting structure according to claim 1, characterized in that, The first end of the pressure block is located in the slot of the frame. Along the length of the pressure block, the first end of the pressure block abuts against the side wall of the slot. The length direction is from the first end of the pressure block to its second end. In the width direction of the pressure block, the pressure block and the slot are fitted with a clearance.

5. A micro-stress lens press-fitting structure according to any one of claims 1-4, characterized in that, When the force balancer is not under force, its total thickness and that of the pressure block above it are between the thickness of the first end of the pressure block and the total thickness of the stress buffer and the second end of the pressure block. When the force balancing component is subjected to force, it undergoes elastic deformation, generating an elastic force that balances the preload provided by the force applying component.

6. The micro-stress lens press-fitting structure according to claim 5, characterized in that, The stress buffer undergoes elastic deformation when subjected to force, and the second end of the pressure block is provided with a mounting hole. The stress buffer is provided with a buffer protrusion that is embedded in the mounting hole. When the stress buffer is not under stress, the thickness of the second end of the protruding pressure block is taken as the thickness of the stress buffer.

7. The micro-stress lens press-fitting structure according to claim 5, characterized in that, The stress buffer undergoes plastic deformation when subjected to force, and the stress buffer is plated on the second end of the pressure block.

8. A pressing method employing the micro-stress lens pressing structure as described in any one of claims 1-7, characterized in that, Includes the following steps: S100. Place the lens inside the frame and install the assembled lens and frame assembly onto the interferometer. S200. Install the stress buffer at the second end of the pressure block, and place the force balance and the pressure block on the surface of the lens frame in sequence so that the stress buffer comes into contact with the lens surface. S300, Install the force-applying component, the first end of the pressure block contacts the surface of the lens frame, the stress buffer separates from the lens surface, rotate the force-applying component to drive the pressure block to apply a pre-tightening force to the lens frame; S400. Observe the phase difference of the lens wavefront displayed by the interferometer. When the phase difference of the lens wavefront begins to change, stop rotating the force-applying component and complete the lens pressing.

9. The pressing method according to claim 8, characterized in that, In step S300, during the process of the rotating force-applying component driving the pressure block to apply a pre-tightening force to the lens frame, the pressure block contacts the force balance component and applies pressure to it, causing the force balance component to undergo elastic deformation and generate an elastic force opposite to the direction of the pre-tightening force. During this process, the distance between the stress buffer component and the lens surface gradually decreases.

10. The pressing method according to claim 8, characterized in that, In step S400, when the distance between the stress buffer and the lens surface decreases to zero, the lens begins to bear the contact stress from the stress buffer, causing its wavefront phase difference to change. At this time, it is determined that the stress buffer is at the critical point of pressing, the rotation of the force-applying component is stopped, and the lens pressing is completed.

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