Micro-contact lens protection box

Abstract

This utility model discloses a micro-contact lens protective box, which includes a box bottom and a box cover. The box bottom has a first groove, and the groove wall of the first groove includes a first wall segment and a second wall segment connected to each other. The connection between the first wall segment and the second wall segment forms a stepped surface. The box cover has a second groove, and the connection between the bottom wall and the side wall of the second groove forms a protrusion. The box cover is used to cover the box bottom so that the first groove and the second groove cooperate to form a mounting cavity. When the optical lens is located in the mounting cavity, one side of the optical lens abuts against the stepped surface, and the other side of the optical lens abuts against the protrusion. The stepped surface and the protrusion cooperate to clamp the optical lens. The technical solution provided by this utility model has the advantages of effectively reducing contact friction on the lens surface and avoiding damage to the coating.

Description

Technical Field

[0001] This utility model relates to the field of optical lens packaging technology, and in particular to a micro-contact lens protective box. Background Technology

[0002] An optical lens is a plastic or glass container made of multiple aspherical condensers with different reflectivities. It generally has multiple layers, each with a specific reflectivity, which can refract and reflect external electromagnetic waves to achieve image formation.

[0003] Currently, optical lenses are commonly packaged using a combination of corrugated cardboard box + EVA liner + plastic blister tray: the lens is first wrapped in non-woven fabric or cotton, then embedded in the blister tray, and finally placed in the cardboard box. While this solution is cost-effective and provides cushioning and shock resistance, the non-woven fabric and cotton have a soft-hard surface contact with the lens, resulting in a large contact area. Furthermore, dust can easily be trapped in the surface fibers, creating a "grinding paper" effect. The blister tray (PET / PP) has a high surface hardness and microscopic roughness, resulting in dry friction with the lens and high local pressure. Both of these factors increase the effective coefficient of friction, causing micro-slippage of the lens during transport vibrations, scratching the surface coating, and producing irreversible scratches. Utility Model Content

[0004] The main purpose of this invention is to propose a micro-contact lens protection box, which has the advantages of effectively reducing contact friction on the lens surface and avoiding damage to the coating.

[0005] To achieve the above objectives, the micro-contact lens protective case proposed in this utility model includes:

[0006] The bottom of the box has a first groove, and the groove wall of the first groove includes a first wall segment and a second wall segment that are connected to each other. The connection between the first wall segment and the second wall segment forms a stepped surface.

[0007] The lid has a second groove, and a protrusion is formed at the connection between the bottom wall and the side wall of the second groove;

[0008] The cover is used to cover the bottom of the box so that the first groove and the second groove cooperate to form a mounting cavity. When the optical lens is located in the mounting cavity, one side of the optical lens abuts against the stepped surface, and the other side of the optical lens abuts against the protrusion. The stepped surface and the protrusion cooperate to clamp the optical lens.

[0009] In one embodiment, the box bottom includes a box body and a flange, the box body has a first groove, the flange is arranged circumferentially around the box body, and the inner diameter of the second groove matches the outer diameter of the box body.

[0010] In one embodiment, the inner diameter of the second groove is larger than the outer diameter of the box body, and the tolerance zone of the outer diameter of the box body is -0.03mm to -0.05mm; the tolerance zone of the inner diameter of the second groove is +0.03mm to +0.05mm.

[0011] In one embodiment, the top of the first wall segment is recessed downward to form at least two spaced notches. When the optical lens is located in the first groove, the top of the optical lens is exposed outside the opening of the first groove, and the outer wall of the optical lens is exposed outside the notches.

[0012] In one embodiment, a first arc-shaped chamfer is formed at the connection between the stepped surface and the second wall segment; a second arc-shaped chamfer is formed at the contact point between the protrusion and the optical lens.

[0013] In one embodiment, the microcontact lens protective case is cylindrical.

[0014] In one embodiment, the inner diameter of the first wall segment is 0.09 mm to 0.12 mm larger than the outer diameter of the optical lens.

[0015] In one embodiment, the inner diameter of the second wall segment is larger than the diameter of the effective light-transmitting aperture of the optical lens.

[0016] In one embodiment, the optical lens has a convex surface, and the height of the convex surface to the edge of the optical lens is less than the height of the second wall segment.

[0017] In one embodiment, the distance between the bottom of the box and the bottom wall of the first groove is 2mm to 4mm; the distance between the top of the box lid and the bottom wall of the second groove is 2mm to 4mm.

[0018] The technical solution of this utility model forms an installation cavity by matching the grooves of the box bottom and the box cover, and uses the stepped surface and the protrusion to clamp the optical lens at three points, which significantly reduces the contact area and effectively suppresses the micro-slippage friction between the lens and the packaging material during transportation. It has the advantages of effectively reducing contact friction on the lens surface and avoiding damage to the coating. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Fig. 1A cross-sectional view of an embodiment of the micro-contact lens protection box provided by this utility model;

[0021] Fig. 2 A three-dimensional structural diagram of an embodiment of the micro-contact lens protective box provided by this utility model;

[0022] Fig. 3 An exploded structural diagram of an embodiment of the micro-contact lens protective box provided by this utility model;

[0023] Fig. 4 This is an exploded structural diagram of another embodiment of the micro-contact lens protection box provided by this utility model.

[0024] Explanation of icon numbers:

[0025] 100. Micro-contact lens protective case; 1. Case bottom; 2. Case lid; 3. Optical lens; 11. Case body; 12. Flange; 111. First groove; 1111. First wall section; 1112. Second wall section; 1113. Step surface; 21. Second groove; 22. Protrusion; 4. Mounting cavity; 5. Notch; 6. First arc-shaped chamfer; 7. Second arc-shaped chamfer; 8. Convex surface.

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0028] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0030] In existing technologies, optical lenses are generally packaged using corrugated cardboard boxes with EVA linings and plastic blister packs. The lenses are wrapped in non-woven fabric or cotton and then embedded in the blister pack. While this method provides cushioning and shock resistance, the large contact area between the soft material and the lens allows dust to easily get trapped in the fibers, creating an abrasive effect. The high surface hardness and microscopic roughness of the blister pack cause dry friction with the lens, and the resulting localized pressure can scratch the coating.

[0031] Please refer to Figs. 1 to 4 This application proposes a micro-contact lens protective case 100, including a case bottom 1 and a case cover 2. The case bottom 1 has a first groove 111, the groove wall of the first groove 111 includes a first wall segment 1111 and a second wall segment 1112 connected to each other, and the connection between the first wall segment 1111 and the second wall segment 1112 forms a stepped surface 1113; the case cover 2 has a second groove 21, and the connection between the bottom wall and the side wall of the second groove 21 forms a protrusion 22; the case cover 2 is used to cover the case bottom 1 so that the first groove 111 and the second groove 21 cooperate to form a mounting cavity 4. When the optical lens 3 is located in the mounting cavity 4, one side of the optical lens 3 abuts against the stepped surface 1113, and the other side of the optical lens 3 abuts against the protrusion 22. The stepped surface 1113 and the protrusion 22 cooperate to clamp the optical lens 3.

[0032] The stepped surface 1113 refers to the horizontal transition surface between the top of the first wall segment 1111 and the top of the second wall segment 1112, used to limit the axial displacement of the lens. The protrusion 22 refers to the annular protrusion formed by the extension of the bottom wall of the second groove 21 to the side wall, which can be formed by injection molding, used to constrain the radial and axial movement of the lens. The mounting cavity 4 refers to the closed space formed after the bottom of the case 1 and the cover of the case 2 are closed. Its size is designed by matching the groove depth so that the lens only contacts the clamping structure at the edge.

[0033] Specifically, when the lid 2 and bottom 1 are closed, the lens is held by the stepped surface 1113 and the protrusion 22. The stepped surface 1113 forms an axial limit through the height difference between the first wall section 1111 and the second wall section 1112, preventing the lens from moving up and down; the protrusion 22 forms a radial limit through the turning structure of the bottom wall and the side wall, preventing the lens from shifting horizontally, and the inner wall of the first wall section 1111 abuts against the optical lens 3 to further prevent the optical lens 3 from moving radially. The lens body is suspended inside the mounting cavity 4, and the coated surface does not contact the packaging structure. The nesting fit between the bottom 1 and the lid 2 is controlled by the groove size tolerance to ensure a smooth and wobbly closing process.

[0034] Compared to existing technologies, traditional packaging relies on soft materials, resulting in a large contact area. This solution employs a rigid clamping structure to concentrate the contact area at the lens edge. In existing technologies, the blister pack and lens have surface contact; this solution reduces the friction area through line contact between the stepped surface 1113 and the protrusion 22. Traditional packaging suffers from fiber friction and localized high pressure issues; this solution eliminates the use of soft materials through geometric fit, avoiding fiber residue and dry friction damage.

[0035] Through the above technical solutions, this application ensures that the lens coating area remains in a non-contact state during transportation, effectively preventing scratches. The clamping structure uses rigid restraint instead of soft wrapping, eliminating the risk of fiber friction. The line contact method at the lens edge reduces the contact area, significantly lowering the coefficient of friction. The precise fit between the case bottom 1 and the case lid 2 ensures positioning accuracy while enabling rapid opening and closing operations.

[0036] This application further proposes that the box bottom 1 includes a box body 11 and a flange 12. The box body 11 has a first groove 111, the flange 12 is arranged around the circumference of the box body 11, and the inner diameter of the second groove 21 matches the outer diameter of the box body 11.

[0037] The box body 11 refers to the main structure that supports the first groove 111, which can be achieved by injection molding to form the basic cavity for accommodating the optical lens 3. The flange 12 refers to the annular protrusion extending around the outer wall of the box body 11, which can be formed by mold processing and is used to form a radial positioning fit with the second groove 21 of the box cover 2. The matching of the inner diameter of the second groove 21 with the outer diameter of the box body 11 means that the two form a clearance fit relationship, which can be achieved by tolerance control, so that the box cover 2 and the box bottom 1 form a stable nested structure when closed.

[0038] Specifically, the box body 11 supports the optical lens 3 via the first groove 111, and the flange 12 serves as an extended support structure for the box bottom 1, forming continuous circumferential contact with the second groove 21 during the closing of the box lid 2. The inner diameter of the second groove 21 and the outer diameter of the box body 11 are matched to form a radial limit, ensuring that the box lid 2 and the box bottom 1 remain concentrically aligned when closed. The annular structure of the flange 12 evenly distributes contact stress during closure, preventing local deformation that could lead to fit failure. The clearance fit between the box body 11 and the second groove 21 allows for minor dimensional deviations during assembly, while maintaining overall structural stability through the annular contact surface of the flange 12.

[0039] Compared to existing technologies, traditional packaging containers typically employ a single-cavity nested structure, lacking a radial positioning mechanism, which makes them prone to misalignment or loosening during assembly. In existing technologies, the blister pack and lens case rely solely on a simple interlocking connection, without a mating structure between the annular flange 12 and the groove, failing to effectively suppress relative displacement during transportation. This application utilizes the mating of the flange 12 and the second groove 21 to form a dual positioning mechanism, ensuring ease of assembly while enhancing the anti-displacement capability of the closed structure.

[0040] Through the above technical solution, this application solves the problem of assembly difficulties or loose fit caused by dimensional deviations between the box lid 2 and the box bottom 1, and avoids friction damage to the optical lens 3 due to unstable packaging structure. The mating structure between the flange 12 and the second groove 21 enables automatic alignment during the assembly process, reduces the need for manual adjustment, and improves the efficiency of automated assembly. The circumferentially continuous contact surface effectively disperses vibration energy, prevents slight shaking of the box body during transportation, and ensures that the coating on the surface of the optical lens 3 is not damaged by contact.

[0041] This application further proposes that the inner diameter of the second groove 21 is larger than the outer diameter of the box body 11, and the tolerance zone of the outer diameter of the box body 11 is -0.03mm to -0.05mm; the tolerance zone of the inner diameter of the second groove 21 is +0.03mm to +0.05mm.

[0042] The tolerance zone for the outer diameter of the box body 11 is a negative deviation range, ensuring that the actual outer diameter of the box body 11 is always smaller than the nominal size. The tolerance zone for the inner diameter of the second groove 21 is a positive deviation range, ensuring that the actual inner diameter of the groove is always larger than the nominal size. The superposition of the tolerances of the two forms the gap range in the diameter direction, which is achieved through bidirectional deviation control.

[0043] Specifically, the negative deviation of the outer diameter of the case body 11 and the positive deviation of the inner diameter of the second groove 21, when superimposed, form a stable gap range when the case cover 2 and the case bottom 1 mate. The lower limit of this gap range can prevent excessive assembly resistance due to machining errors, while the upper limit can prevent relative displacement from exceeding the allowable range. During automated assembly, the dimensional deviation direction of the case body 11 and the second groove 21 is limited to a unidirectional compensation relationship, so that the case cover 2 and the case bottom 1 can achieve smooth mating without precise adjustment when axially aligned, while eliminating the imbalance of lens clamping force caused by gap fluctuations.

[0044] Through the above technical solution, this application forms a controlled gap on the mating surface of the case, so that the case cover 2 and the case bottom 1 can achieve self-alignment and bonding without external force during automated assembly, while maintaining a stable contact state between the lens and the clamping structure during transportation, avoiding the risk of coating wear caused by case displacement.

[0045] This application further proposes that at least two spaced notches 5 are formed by a downward recess at the top of the first wall segment 1111. When the optical lens 3 is located in the first groove 111, the top of the optical lens 3 is exposed outside the groove of the first groove 111, and the outer wall of the optical lens 3 is exposed outside the notches 5.

[0046] The notch 5 refers to the spatial structure formed by the downward indentation at the top of the first wall segment 1111. Specifically, it can be implemented using rectangular, semi-circular, or trapezoidal grooves, and its distribution is evenly spaced along the circumference of the first wall segment 1111. The notch 5 reduces the contact area between the first wall segment 1111 and the outer wall of the optical lens 3, avoiding frictional damage caused by large-area contact in traditional packaging. "Exposed" refers to the state where the top and outer wall of the optical lens 3 are not completely covered by the first groove 111, which can be achieved by adjusting the depth and width of the notch 5. The exposed state allows the optical lens 3 to effectively abut against the protrusion 22 of the box cover 2, while also providing clamping space for operating tools.

[0047] Specifically, the notches 5 are spaced apart along the top of the first wall segment 1111, forming multiple discontinuous contact areas. When the optical lens 3 is placed in the first groove 111, its outer wall only contacts the first wall segment 1111 in the solid portion between the notches 5, significantly reducing the contact area. The top of the optical lens 3 is not covered by the first groove 111, allowing it to directly contact the protrusion 22 of the cover 2, forming an upper and lower clamping structure. During operation, tools can directly contact the outer wall of the optical lens 3 through the notches 5, facilitating the placement and removal of the lens.

[0048] Compared to existing technologies, traditional packaging uses non-woven fabric or cotton to wrap the lenses, resulting in a large contact area between the soft and hard surfaces and making it easy for particulate matter to remain. The notch 5 design changes the contact between the lens and the packaging to discrete point contact, eliminating the risk of fiber friction. Existing blister packs have rough surfaces and make full-circumference contact with the lenses, while the notch 5 structure reduces the number and area of ​​contact points, lowers local pressure, and avoids scratches on the coating.

[0049] Through the above technical solution, this application reduces the contact area between the optical lens 3 and the packaging to discrete local areas, effectively avoiding scratches on the surface coating caused by large-area friction. The operating window formed by the notch 5 allows the lens to directly contact the lens edge when picking up or placing it, avoiding positioning deviations caused by the packaging material and improving assembly efficiency.

[0050] This application further proposes that a first arc-shaped chamfer 6 is formed at the connection between the stepped surface 1113 and the second wall segment 1112, and a second arc-shaped chamfer 7 is formed at the contact point between the protrusion 22 and the optical lens 3.

[0051] The first arc-shaped chamfer 6 refers to the arc-shaped transition structure formed at the connection between the step surface 1113 and the second wall segment 1112. This can be achieved through CNC machining or injection molding to eliminate stress concentration at right-angle connections. The second arc-shaped chamfer 7 refers to the arc-shaped transition structure at the contact point between the protrusion 22 and the optical lens 3. This can be achieved through molding or mechanical polishing to form a smooth contact surface and reduce local pressure.

[0052] Specifically, the first arc-shaped chamfer 6 changes the right-angle connection between the stepped surface 1113 and the second wall segment 1112 to a rounded transition, avoiding stress concentration when the lens edge makes hard contact with the rigid stepped surface 1113. The second arc-shaped chamfer 7 designs the contact area between the protrusion 22 and the lens as a rounded surface, changing the contact method between the lens coating area and the protrusion 22 from point contact to surface contact. The two arc-shaped chamfer structures work together to maintain the stability of lens clamping while dispersing mechanical stress by changing the geometry of the contact surface, thereby preventing the coating from being scratched due to micro-slippage during transportation vibration.

[0053] Compared to existing technologies, traditional lens packaging structures often employ right-angle or planar contact designs for rigid contact surfaces, which can easily create localized high-pressure areas under vibration. This application transforms rigid contact into flexible curved surface contact through a double-arc chamfered structure, maintaining clamping and positioning accuracy while significantly reducing the pressure per unit area of ​​the contact surface, fundamentally avoiding the risk of damage to the coating layer due to friction.

[0054] Through the above technical solution, this application solves the problem of coating scratches caused by rigid contact of the lens within the protective case. The flexible contact surface formed by the arc-shaped chamfer effectively disperses the mechanical stress between the lens and the clamping structure, suppresses frictional damage between the coating layer and hard materials during transportation vibration, and maintains the positional stability of the lens within the mounting cavity 4.

[0055] This application further proposes a design scheme in which the micro-contact lens protection box 100 adopts a cylindrical structure.

[0056] The cylindrical structure refers to the axially symmetrical cylindrical geometry of the protective case, which creates a uniform stress distribution on the contact surface between the case and the lens. Uniform circumferential guidance refers to the matching relationship between the cylindrical case and the circular outline of the lens, achieved by controlling the tolerances of the inner diameter of the case and the outer diameter of the lens. The continuous circumferential contact surface provides a guiding path for automated assembly. Standardized processing refers to the mass production of the cylindrical case using lathes or molds. This is achieved by controlling machining precision to ensure coaxiality between the lid 2 and the bottom 1 when closed, preventing lens misalignment due to assembly deviations.

[0057] Specifically, the axisymmetric nature of the cylindrical structure ensures that the clamping force on the lens within the mounting cavity 4 is evenly distributed along the circumference, eliminating localized stress concentrations caused by angular structures and thus reducing the risk of scratches on the coated surface. During automated assembly, the cylindrical housing and the circular contour of the lens form a continuous circumferential contact surface, reducing the probability of assembly misalignment through uniform guidance. The cylindrical structure is manufactured using turning or injection molding to achieve high-precision mating surfaces, ensuring that the coaxiality error is minimized when the cover 2 and bottom 1 are closed, preventing frictional displacement of the lens due to assembly deviations. Furthermore, the cylindrical housing forms a stable nested structure during stacked transport, reducing the impact of vibration transmission paths on the lens.

[0058] Compared to existing technologies, traditional packaging uses a combination of corrugated cardboard boxes and blister packs. The sharp angles of these blister packs create stress concentration points on the lens contact surface. The cylindrical protective box, through its axisymmetric design, eliminates these localized high-pressure areas. Existing blister packs have high surface hardness and microscopic roughness, resulting in dry friction with the lens. The continuous contact surface of the cylindrical structure disperses the frictional load. Traditional packaging relies on non-woven fabric to wrap the lens, making the assembly process susceptible to interference from fibrous impurities. The cylindrical box, however, achieves precise positioning through circumferential guidance, reducing the need for manual intervention.

[0059] Through the above technical solution, this application solves the problem of lens coating scratches caused by unreasonable shape design in traditional packaging, and reduces surface contact pressure through axisymmetric force distribution. The circumferential continuous contact surface of the cylindrical structure provides a uniform guiding path for automated assembly, reducing the risk of lens misalignment caused by assembly misalignment. Standardized processing technology ensures the coaxiality of the box body, avoiding frictional damage caused by shape deviation. The cylindrical shell optimizes stacking stability and reduces the indirect impact of transportation vibration on the lenses.

[0060] This application further proposes that the inner diameter of the first wall segment 1111 is 0.09 mm to 0.12 mm larger than the outer diameter of the optical lens 3.

[0061] The inner diameter of the first wall segment 1111 refers to the inner diameter of the wall segment in the first groove 111 of the box bottom 1 that directly contacts the optical lens 3. This diameter can be achieved through machining or mold forming, and its dimensional accuracy must be controlled within ±0.01mm to form a fixed gap with the outer diameter of the lens. The outer diameter of the optical lens 3 refers to the maximum diameter of the lens edge, which can be calibrated using optical measuring equipment, with a tolerance range typically ±0.02mm. The gap between the two is designed using a dimensional difference, ensuring that the lens can be inserted into the groove without resistance while preventing the lens from wobbling due to an excessively large gap.

[0062] Specifically, the gap between the first wall segment 1111 and the optical lens 3 forms a non-contact positioning through dimensional difference. When the lens is placed in the first groove 111, the existence of the gap ensures that there is no direct hard contact between the lens edge and the wall segment; it is only fixed by the clamping of the stepped surface 1113 and the protrusion 22. This gap range has been experimentally verified to be compatible with tolerance fluctuations in the lens's outer diameter, ensuring that the lens can still be smoothly installed under different batches or processing errors. At the same time, the existence of the gap eliminates the dry friction path between the lens and the blister pack in traditional packaging, avoiding scratches on the coated surface due to excessive local pressure.

[0063] Compared to existing technologies, traditional packaging solutions rely on wrapping with soft materials or direct contact with rigid blister packs. The former leads to increased frictional resistance due to the large contact area, while the latter causes localized pressure concentration due to surface roughness. This solution, by precisely controlling the gap dimensions, ensures that the lens is fixed only through two points of contact: the stepped surface 1113 and the protrusion 22. This avoids the abrasive effect caused by particles trapped in the fibers of soft materials and eliminates the risk of surface damage caused by direct contact with rigid materials.

[0064] Through the above technical solution, this application solves the problem of friction damage caused by improper size matching during lens installation. The lens can be naturally embedded into the groove without the application of external force. The installation process does not require manual adjustment of angle or application of pressure. At the same time, the positional stability of the lens is guaranteed during transportation, and there is no risk of contact damage to the coating surface.

[0065] This application further proposes that the inner diameter of the second wall segment 1112 is larger than the diameter of the effective light-transmitting aperture of the optical lens 3.

[0066] The second wall segment 1112 refers to the groove wall portion in the first groove 111 of the bottom 1 of the housing that connects to the first wall segment 1111. Specifically, it can be implemented using a stepped structure design, with its inner diameter configured to cover only the non-coated area at the edge of the optical lens 3. The effective light-transmitting aperture refers to the coated portion in the central area of ​​the optical lens 3 used for light transmission. This can be achieved by limiting the coating area on the lens surface, and its aperture size is smaller than the inner diameter of the second wall segment 1112.

[0067] Specifically, when the optical lens 3 is installed within the mounting cavity 4 enclosed by the bottom 1 and the cover 2 of the case, the inner diameter of the second wall section 1112 is larger than the diameter of the effective light-transmitting aperture. This ensures that the second wall section 1112 only contacts the non-coated area at the edge of the lens, without touching the central coated area. Through this size-matching design, the second wall section 1112 avoids the coated area of ​​the light-transmitting aperture when holding the lens, spatially isolating the contact path between the packaging structure and the optical functional surface of the lens.

[0068] Compared to existing technologies, traditional packaging solutions involve blister packs or inner lining materials directly contacting the lens surface, causing scratches on the coated area during transportation due to friction or compression. This solution, by limiting the inner diameter of the second wall section 1112, ensures that the packaging structure only contacts the non-functional areas at the lens edge, avoiding physical damage to the light-transmitting aperture coating area.

[0069] Through the above technical solution, this application can ensure that the light-transmitting aperture coating area of ​​the optical lens 3 is in a non-contact state during the packaging process, effectively preventing surface scratches caused by mechanical contact and improving the yield of finished lenses.

[0070] This application further proposes that the optical lens 3 has a convex surface 8, and the height of the convex surface 8 to the edge of the optical lens 3 is less than the height of the second wall segment 1112.

[0071] The height from the convex surface 8 to the edge of the optical lens 3 refers to the vertical distance from the vertex of the lens surface to its outer edge. This distance can be achieved by controlling the processing accuracy of the lens edge support structure. This parameter is used to limit the axial extension range of the lens protrusion 22. The height of the second wall section 1112 refers to the axial extension length of the part in the side wall of the groove of the box bottom 1 that connects with the stepped surface 1113. This height can be achieved by adjusting the dimensional tolerance of the box forming mold. This parameter is used to provide a space for the convex surface 8 of the lens.

[0072] Specifically, when the optical lens 3 is placed in the groove of the box bottom 1, the height from the vertex to the edge of its convex surface 8 is limited within the height range of the second wall section 1112, so that the edge of the lens contacts the stepped surface 1113 to form support, while the coated area of ​​the convex surface 8 remains in a non-contact state with the box body. Regardless of whether the lens is installed in the protective box in the forward or reverse direction, the second wall section 1112 can provide sufficient axial space to prevent the central area of ​​the lens surface from making physical contact with the box bottom 1 or the box cover 2, thereby eliminating the risk of friction between the coated surface and the packaging container during transportation.

[0073] In some specific embodiments, the convex surface 8 of the lens can be formed into a spherical or aspherical structure by injection molding process, and its edge support area is polished to reduce contact stress; the inner surface of the second wall section 1112 can be provided with annular ribs to further reduce the contact area with the lens through local contact.

[0074] Compared to existing technologies, traditional packaging solutions use soft materials to wrap the lens and embed it in a blister pack, resulting in a large contact area between the lens surface and non-woven fabric or cotton. Fiber impurities can easily scratch the coating. This solution, by defining the dimensional relationship between the convex surface 8 of the lens and the second wall section 1112 of the box, creates a physical isolation between the coated area and the packaging structure, directly avoiding contact damage.

[0075] Through the above technical solution, this application solves the problem of coating scratches caused by surface contact during the packaging and transportation of optical lenses 3. The non-contact support structure ensures that there is no friction between the effective light transmission area of ​​the lens and the packaging container, thereby improving the yield of finished lenses and the safety of transportation.

[0076] This application further proposes that the distance between the bottom of the box bottom 1 and the bottom wall of the first groove 111 is 2 mm to 4 mm, and the distance between the top of the box cover 2 and the bottom wall of the second groove 21 is 2 mm to 4 mm.

[0077] The distance between the bottom of the box bottom 1 and the bottom wall of the first groove 111 refers to the vertical distance between the outer surface of the box bottom 1 and the inner surface of the first groove 111. This distance can be achieved by controlling the uniformity of the wall thickness through injection molding. This distance range ensures that the box bottom 1 has sufficient bending resistance under pressure, while avoiding material redundancy that would increase weight. The distance between the top of the box lid 2 and the bottom wall of the second groove 21 refers to the vertical distance between the outer surface of the box lid 2 and the inner surface of the second groove 21. This distance can be achieved by limiting the molding thickness through mold design. This distance range allows the box lid 2 to form a symmetrical support structure with the box bottom 1 when closed, distributing the stress of external loads on the groove area.

[0078] Specifically, the distance between the bottom of box 1 and the bottom wall of the recess is limited by a minimum thickness to prevent deformation and breakage of the recess due to external impact, while the maximum thickness limit prevents the overall packaging weight from exceeding transportation cost control requirements. The equal thickness design of the top of box lid 2 and the bottom wall of the recess ensures mechanical symmetry between the lid 2 and box bottom 1 when closed, reducing stress concentration caused by local wall thickness differences. By balancing material strength and lightweight requirements, this distance range maintains the structural integrity of the protective box during automated assembly while preventing the risk of lens pressure due to excessively thin walls.

[0079] Compared to existing technologies, the wall thickness design of traditional packaging boxes is not optimized for lens protection needs. For example, blister packs typically use a thin-walled structure of less than 2 mm to reduce material costs, but they are prone to deformation during transportation, causing the lens to rub directly against hard surfaces. While some protective boxes use a thicker wall design of more than 4 mm to improve strength, this increases packaging weight and transportation energy consumption. This solution achieves lightweighting while ensuring structural stability by limiting the wall thickness range.

[0080] Through the above technical solution, this application solves the problems of weak pressure resistance caused by insufficient wall thickness and excessive weight caused by excessive wall thickness of lens protective boxes. It avoids the defects of thin-walled structures being easily damaged in automated production lines, reduces the transportation cost of thick-walled packaging, and ensures that the lenses will not be squeezed and damaged due to deformation of the protective box during storage.

[0081] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A micro-contact lens protective case for holding optical lenses, characterized in that, The microcontact lens protective case includes: The bottom of the box has a first groove, and the groove wall of the first groove includes a first wall segment and a second wall segment that are connected to each other. The connection between the first wall segment and the second wall segment forms a stepped surface. The box lid has a second groove, and a protrusion is formed at the connection between the bottom wall and the side wall of the second groove; The cover is used to cover the bottom of the box so that the first groove and the second groove cooperate to form a mounting cavity. When the optical lens is located in the mounting cavity, one side of the optical lens abuts against the stepped surface, and the other side of the optical lens abuts against the protrusion. The stepped surface and the protrusion cooperate to clamp the optical lens.

2. The microcontact lens protective case as described in claim 1, characterized in that, The bottom of the box includes a box body and a flange. The box body has a first groove, the flange is arranged around the circumference of the box body, and the inner diameter of the second groove matches the outer diameter of the box body.

3. The micro-contact lens protective case as described in claim 2, characterized in that, The inner diameter of the second groove is larger than the outer diameter of the box body. The tolerance zone of the outer diameter of the box body is -0.03mm to -0.05mm; the tolerance zone of the inner diameter of the second groove is +0.03mm to +0.05mm.

4. The microcontact lens protective case as described in claim 2, characterized in that, The top of the first wall segment is recessed downward to form at least two spaced notches. When the optical lens is located in the first groove, the top of the optical lens is exposed outside the groove opening of the first groove, and the outer wall of the optical lens is exposed outside the notches.

5. The microcontact lens protective case as described in claim 1, characterized in that, The connection between the stepped surface and the second wall segment forms a first arc-shaped chamfer; the contact point between the protrusion and the optical lens forms a second arc-shaped chamfer.

6. The microcontact lens protective case as described in any one of claims 1 to 5, characterized in that, The microcontact lens protective case is cylindrical.

7. The microcontact lens protective case as described in any one of claims 1 to 5, characterized in that, The inner diameter of the first wall segment is 0.09 mm to 0.12 mm larger than the outer diameter of the optical lens.

8. The microcontact lens protective case as described in any one of claims 1 to 5, characterized in that, The inner diameter of the second wall section is larger than the diameter of the effective light-transmitting aperture of the optical lens.

9. The microcontact lens protective case as described in any one of claims 1 to 5, characterized in that, The optical lens has a convex surface, and the height of the convex surface to the edge of the optical lens is less than the height of the second wall segment.

10. The microcontact lens protective case as described in any one of claims 1 to 5, characterized in that, The distance between the bottom of the box and the bottom wall of the first groove is 2mm to 4mm; the distance between the top of the box lid and the bottom wall of the second groove is 2mm to 4mm.

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