Contact lens mold

Abstract

The utility model relates to the mould design field of contact lenses, especially to a contact lens mould. The contact lens mould comprises a female mould and a male mould, the female mould has a concave cavity inside, the concave cavity forms an opening on one side of the female mould, the bottom of the concave cavity has an inner arc surface, and the connecting part of the inner arc surface and the side wall of the concave cavity forms a female mould cutter. The male mould has an outer arc surface at one end, and the one end of the male mould is inserted into the concave cavity. A plurality of bosses are arranged on the outer circumferential surface of the male mould in a circumferential direction, and the bosses abut against the side wall of the concave cavity; or a plurality of bosses are arranged on the side wall of the concave cavity in a circumferential direction, and the bosses abut against the outer circumferential surface of the male mould. Such an assembly mode reduces the contact area when the male mould and the female mould are in interference fit, reduces the deformation amount of the bosses, ensures that the cavity formed after the lens is closed has good cylindricity, and the produced lens has good edge roundness. The existence of the bosses ensures that the axes of the male mould and the female mould coincide, and ensures that the male mould and the female mould are uniformly stressed and do not deform.

Description

Technical Field

[0001] This utility model relates to the field of contact lens mold design, and more particularly to a contact lens mold. Background Technology

[0002] Contact lenses, also known as clear lenses or corneal contact lenses, are optical products that are directly attached to the cornea of ​​the eye. They are primarily used to improve vision problems such as myopia, hyperopia, and astigmatism, and are also used as cosmetic tools, such as changing eye color or enhancing the appearance of the eyes. Compared to traditional eyeglasses, contact lenses offer greater comfort and convenience, making them widely popular in the market.

[0003] With economic development, contact lenses have become ubiquitous in daily life. Given the sheer number of lenses people wear, almost all contact lenses on the market today are manufactured using a molding process. In the production of contact lenses, a cavity is formed by pressing a male mold and a female mold together to create the lens. During production, the male mold is positioned on top and the female mold on the bottom. The monomers needed to form the contact lens are injected into the female mold, and then the male and female molds are pressed together, ensuring a tight seal. The monomers are then molded within the cavity, forming the contact lens.

[0004] Currently, male and female molds on the market require a gap during mold closing. This allows for easy separation of the male and female molds when removing the lens, and also prevents excessive leakage of individual particles through the gap, thus reducing the likelihood of air bubbles forming during lens mold closing. Consequently, movement can occur between the male and female molds during the pressing process, leading to potential misalignment during mold mating. This misalignment can cause instability in parameters such as lens center thickness, optical power, and image quality during production. Utility Model Content

[0005] This invention provides a contact lens mold to solve the problem that existing male and female molds may move during the pressing process, leading to misalignment during mold fitting.

[0006] This utility model provides a contact lens mold, comprising:

[0007] The master mold has a cavity inside, the cavity forms an opening on one side of the master mold, the bottom of the cavity has an inner arc surface, and the connection between the inner arc surface and the side wall of the cavity forms the master mold cutting point;

[0008] The male mold has an outer arc surface at one end, which is inserted into the cavity, and the outer arc surface abuts against the cutting edge of the female mold.

[0009] The outer peripheral surface of the male mold is provided with a plurality of protrusions spaced circumferentially, and the protrusions abut against the side wall of the cavity.

[0010] Alternatively, the sidewall of the cavity may be provided with a plurality of protrusions spaced circumferentially, and the protrusions abut against the outer peripheral surface of the male mold.

[0011] According to the present invention, a contact lens mold has a plurality of peripheral vertical surfaces on its outer periphery, and the plurality of peripheral vertical surfaces are connected sequentially along the height direction of the mold.

[0012] According to the contact lens mold provided by this utility model, along the direction close to the outer arc surface, the outer diameter of a plurality of outer peripheral vertical surfaces gradually decreases to form a step at the connection of two adjacent outer peripheral vertical surfaces.

[0013] According to the present invention, when the boss is provided on the outer peripheral surface of the male mold, the boss is located on the outer peripheral vertical surface near the outer arc surface, the thickness of the boss near the opening is greater than the thickness of the boss away from the opening, and a first inclined surface is formed on the side of the boss facing the sidewall of the cavity, and the side of the first inclined surface near the opening abuts against the sidewall of the cavity.

[0014] According to the contact lens mold provided by this utility model, the thickness of the boss at the end near the opening is a, and the thickness of the boss at the end away from the opening is c, where the value of c / a is greater than or equal to 0 and less than 0.6.

[0015] According to the contact lens mold provided by this utility model, the sidewall of the concave cavity is an inner circumferential vertical surface, and the angle between the first inclined surface and the inner circumferential vertical surface is α, the value of α is in the range of 3°-7°.

[0016] According to the contact lens mold provided by this utility model, the sidewall of the concave cavity is a second inclined surface, and the angle between the second inclined surface and the outer peripheral vertical surface is β, the value of β is in the range of 3°-7°.

[0017] According to the present invention, when the boss is provided on the side wall of the cavity, the thickness of the boss near the opening is less than the thickness of the boss away from the opening, and a first inclined surface is formed on the side of the boss facing the outer peripheral surface of the male mold, and the side of the first inclined surface away from the opening abuts against the outer peripheral surface of the male mold.

[0018] According to the contact lens mold provided by this utility model, the thickness of the boss at the end near the opening is c, and the thickness of the boss at the end away from the opening is a, where the value of c / a is greater than or equal to 0 and less than 0.6.

[0019] According to the contact lens mold provided by this utility model, the sidewall of the concave cavity is an inner circumferential vertical surface, and the angle between the first inclined surface and the inner circumferential vertical surface is γ, the value of γ is in the range of 3°-7°.

[0020] The contact lens mold provided by this utility model has multiple bosses spaced circumferentially on the outer peripheral surface of the male mold, with the bosses abutting against the sidewall of the cavity; or, multiple bosses spaced circumferentially on the sidewall of the cavity, with the bosses abutting against the outer peripheral surface of the male mold. This assembly method reduces the contact area when the male mold and female mold are in an interference fit, reduces the deformation of the bosses, and ensures that the cavity formed after the lens is molded has good cylindricity and the produced lens has good edge roundness. Because of the presence of the bosses, the axes of the male mold and female mold are coincident, ensuring that the male mold and female mold are subjected to uniform force and will not deform. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the contact lens mold provided in the first embodiment of this utility model.

[0023] Figure 2 This is a schematic diagram of the structure of the public mold provided in the first embodiment of this utility model.

[0024] Figure 3 This is a schematic diagram of the structure of the master mold provided in the first embodiment of this utility model.

[0025] Figure 4 yes Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0026] Figure 5 This is a schematic diagram of the boss provided in the first embodiment of this utility model.

[0027] Figure 6 This is a schematic diagram of the structure of the contact lens mold provided in the second embodiment of this utility model.

[0028] Figure 7 This is a schematic diagram of the structure of the public mold provided in the second embodiment of this utility model.

[0029] Figure 8 This is a schematic diagram of the structure of the master mold provided in the second embodiment of this utility model.

[0030] Figure 9 yes Figure 6 A magnified schematic diagram of the structure at point B in the middle.

[0031] Figure 10 This is a schematic diagram of the boss provided in the second embodiment of the present invention.

[0032] Figure 11 This is a schematic diagram of the structure of the contact lens mold provided in the third embodiment of this utility model.

[0033] Figure 12 This is a schematic diagram of the structure of the master mold provided in the third embodiment of this utility model.

[0034] Figure label:

[0035] 100, Female mold; 110, Opening; 120, Inner arc surface; 130, Cutting edge of female mold; 140, Inner circumferential vertical surface; 150, Second inclined surface; 200, Male mold; 210, Outer arc surface; 220, Boss; 230, Outer circumferential vertical surface; 240, First inclined surface. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0039] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] like Figures 1 to 4 As shown, the contact lens mold includes a female mold 100 and a male mold 200. The female mold 100 has a cavity inside, with an opening 110 on one side. The bottom of the cavity has an inner arc surface 120, and the connection between the inner arc surface 120 and the side wall of the cavity forms a female mold cutting edge 130. One end of the male mold 200 has an outer arc surface 210, which is inserted into the cavity. The outer arc surface 210 abuts against the female mold cutting edge 130. After one end of the male mold 200 is inserted into the cavity, due to the radial force, the male mold 200 and the female mold 100 will not naturally separate after being closed, thus improving the stability of the mold. The outer peripheral surface of the male mold 200 is provided with a plurality of bosses 220 at intervals along the circumferential direction, and the bosses 220 abut against the side wall of the cavity; or, the side wall of the cavity is provided with a plurality of bosses 220 at intervals along the circumferential direction, and the bosses 220 abut against the outer peripheral surface of the male mold 200.

[0042] The contact lens mold provided by this utility model has multiple bosses 220 spaced circumferentially on the outer peripheral surface of the male mold 200, with the bosses 220 abutting against the sidewall of the cavity; or, multiple bosses 220 spaced circumferentially on the sidewall of the cavity, with the bosses 220 abutting against the outer peripheral surface of the male mold 200. This assembly method reduces the contact area when the male mold 200 and the female mold 100 are in an interference fit, reduces the deformation of the bosses 220, and ensures that the cavity formed after the lens is molded has good cylindricity and the produced lens has good edge roundness. Because of the presence of the bosses 220, the axes of the male mold 200 and the female mold 100 are coincident, ensuring that the male mold 200 and the female mold 100 are subjected to uniform force and will not deform.

[0043] In one embodiment of this utility model, such as Figure 2 As shown, each boss 220 has the same shape and size, and the distance between any two adjacent bosses 220 is equal. This ensures that the radial force on each boss 220 is equal, resulting in more uniform stress on the male mold 200 and female mold 100 during mold closing. Irregular deformation of the male mold 200 and female mold 100 is prevented, and radial offset does not occur after mold closing, thus avoiding changes in the alignment of their axes and affecting the coaxiality of the fit. Due to the balanced force, the deformation of the bosses 220 also tends to be consistent, further ensuring the cylindricity of the lens forming cavity and the roundness of the lens edge, improving the lens forming accuracy and optical performance.

[0044] In one embodiment of this utility model, such as Figure 2 As shown, the outer peripheral surface of the male mold 200 has multiple outer peripheral vertical surfaces 230, each of which is parallel to the central axis of the male mold 200. These multiple outer peripheral vertical surfaces 230 are located along the height direction of the male mold 200 (i.e.,...). Figure 2 Connect them sequentially in the top and bottom directions.

[0045] In one embodiment of this utility model, along the direction close to the outer arc surface 210 (i.e. Figure 2 (In the downward direction), the outer diameters of multiple outer circumferential vertical surfaces 230 gradually decrease to form steps at the junctions of adjacent outer circumferential vertical surfaces 230. For example... Figure 2 As shown, the outer peripheral surface of the male mold 200 has four outer peripheral vertical surfaces 230, and the outer peripheral surface of the male mold 200 forms three steps, among which the outer peripheral vertical surface 230 closest to the outer arc surface 210 has the smallest outer diameter.

[0046] In one embodiment of this utility model, such as Figure 4 and Figure 5 As shown, when the boss 220 is provided on the outer peripheral surface of the male mold 200, the boss 220 is located on the outer peripheral vertical surface 230 near the outer arc surface 210 (i.e., Figure 4 On the lowest outer peripheral vertical surface 230), the boss 220 is located near the opening 110. Figure 4 The thickness of the upper end of the boss 220 is greater than the end of the boss 220 furthest from the opening 110. Figure 4 The thickness of the lower end of the boss 220 is such that a first inclined surface 240 is formed on the side of the boss 220 facing the sidewall of the cavity, and the side of the first inclined surface 240 near the opening 110 abuts against the sidewall of the cavity. By making the boss 220 have an inclined structure that is wider at the top and narrower at the bottom, it is ensured that the first inclined surface 240 of the boss 220 does not completely contact the sidewall of the cavity, reducing the contact area and thus reducing friction, which facilitates the separation of the male mold 200 from the female mold 100 during subsequent production.

[0047] In one embodiment of this utility model, such as Figure 4 and Figure 5 As shown, the thickness of the boss 220 near the opening 110 is 'a', and the thickness of the boss 220 away from the opening 110 is 'c', where the value of c / a is greater than or equal to 0 and less than 0.6. By reasonably controlling the thickness ratio of the two ends of the boss 220, the boss 220 can produce appropriate elastic deformation under stress, which can ensure a tight fit between the male mold 200 and the female mold 100, and effectively reduce stress concentration of the boss 220 during the mold closing process. At the same time, this thickness ratio design helps to achieve stable contact between the boss 220 and the side wall of the cavity or the outer peripheral surface of the male mold 200, improve the concentricity and positioning accuracy of the mold, ensure the cylindricity of the lens forming cavity and the roundness of the lens edge, thereby improving the forming quality and optical performance of the lens.

[0048] In one embodiment of this utility model, such as Figure 5 As shown, the sidewall of the cavity is an inner circumferential vertical surface 140, and the angle between the first inclined surface 240 and the inner circumferential vertical surface 140 is α, with α ranging from 3° to 7°. Using this angle range not only improves the fitting stability between the boss 220 and the cavity sidewall, enhancing the overall concentricity and positioning accuracy of the mold, but also effectively reduces frictional resistance during mold closing, making the assembly of the male mold 200 and the female mold 100 smoother.

[0049] In one embodiment of this utility model, such as Figure 11 and Figure 12As shown, the sidewall of the cavity is a second inclined surface 150, and the angle between the second inclined surface 150 and the outer circumferential vertical surface 230 is β, with β ranging from 3° to 7°. By controlling the angle β within a reasonable range of 3° to 7°, the male mold 200 can be effectively guided to smoothly enter the cavity of the female mold 100, avoiding eccentricity during assembly and ensuring the smoothness and stability of the mold closing process. This angle design not only improves the assembly efficiency of the mold but also effectively reduces frictional resistance during mold closing, reduces mold wear, and extends the mold's service life. Simultaneously, the guiding effect of the second inclined surface 150 helps to achieve precise positioning of the male mold 200 and the female mold 100, further improving the cylindricity of the lens forming cavity and the roundness of the lens edge, ensuring the consistency of lens forming quality and the stability of optical performance. In addition, the second inclined surface 150 can facilitate the separation of the male mold 200 and the female mold 100 during demolding, making the separation of the male mold 200 and the female mold 100 smoother, reducing the risk of damage when the lens is removed, and improving production efficiency and product quality.

[0050] In one embodiment of this utility model, such as Figures 6 to 9 As shown, when the boss 220 is provided on the side wall of the cavity, the thickness of the boss 220 near the opening 110 is less than the thickness of the boss 220 away from the opening 110. The boss 220 forms a first inclined surface 240 on the side facing the outer peripheral surface of the male mold 200. The side of the first inclined surface 240 away from the opening 110 abuts against the outer peripheral surface of the male mold 200.

[0051] In one embodiment of this utility model, such as Figure 10 As shown, the thickness of the boss 220 near the opening 110 is c, and the thickness of the boss 220 away from the opening 110 is a. The value of c / a is greater than or equal to 0 and less than 0.6.

[0052] In one embodiment of this utility model, such as Figure 10 As shown, the sidewall of the concave cavity is an inner circumferential vertical surface 140, and the angle between the first inclined surface 240 and the inner circumferential vertical surface 140 is γ, with the value of γ ranging from 3° to 7°.

[0053] In one specific embodiment of this utility model, such as Figures 1 to 5As shown, the contact lens mold includes a female mold 100 and a male mold 200. The female mold 100 has a cavity inside, with an opening 110 on one side. The bottom of the cavity has an inner arc surface 120, and the connection between the inner arc surface 120 and the side wall of the cavity forms a female mold cutting edge 130. One end of the male mold 200 has an outer arc surface 210, which is inserted into the cavity, and the outer arc surface 210 abuts against the female mold cutting edge 130. Multiple bosses 220 are spaced circumferentially on the outer periphery of the male mold 200. Each boss 220 has the same shape and size, and the distance between adjacent bosses 220 is equal. A groove is formed between adjacent bosses 220, thus forming an effective cavity channel to ensure that excess lenses overflow through the groove. The female mold 100 and the male mold 200 cooperate to form a closed cavity, which is shaped like a contact lens.

[0054] The outer peripheral surface of the male mold 200 has four outer peripheral vertical surfaces 230, each of which is parallel to the central axis of the male mold 200. The four outer peripheral vertical surfaces 230 are connected sequentially along the height direction of the male mold 200. Along the direction closest to the outer arc surface 210 (i.e.... Figure 1 (In the downward direction), the outer diameters of the four outer circumferential vertical surfaces 230 gradually decrease to form a step at the connection between two adjacent outer circumferential vertical surfaces 230. In this embodiment, the outer circumferential surface of the mold 200 forms three steps, with the outer diameter of the outer circumferential vertical surface 230 closest to the outer arc surface 210 being the smallest.

[0055] Multiple bosses 220 are located on the outer circumferential vertical surface 230 near the outer arc surface 210. The thickness of the boss 220 at the end near the opening 110 is greater than the thickness of the end away from the opening 110. A first inclined surface 240 is formed on the side of the boss 220 facing the sidewall of the cavity. The side of the first inclined surface 240 near the opening 110 abuts against the sidewall of the cavity, so that part of the first inclined surface 240 abuts against the sidewall of the cavity. In this embodiment, the thickness of the boss 220 at the end near the opening 110 is 'a', and the thickness of the boss 220 at the end away from the opening 110 is 'c'. The value of c / a is greater than or equal to 0 and less than 0.6. The sidewall of the cavity is an inner circumferential vertical surface 140. The angle between the first inclined surface 240 and the inner circumferential vertical surface 140 is γ, and the value of γ ranges from 3° to 7°.

[0056] In another specific embodiment of this utility model, such as Figures 6 to 10As shown, the contact lens mold includes a female mold 100 and a male mold 200. The female mold 100 has a cavity inside, with an opening 110 on one side. The bottom of the cavity has an inner arc surface 120, and the connection between the inner arc surface 120 and the side wall of the cavity forms a female mold cutting edge 130. One end of the male mold 200 has an outer arc surface 210, which is inserted into the cavity, and the outer arc surface 210 abuts against the female mold cutting edge 130. Multiple bosses 220 are spaced circumferentially along the side wall of the cavity. The bosses 220 abut against the outer circumferential surface of the male mold 200. Each boss 220 has the same shape and size, and the distance between adjacent bosses 220 is equal. A groove is formed between adjacent bosses 220, thus forming an effective cavity channel to ensure that excess lenses overflow through the groove. The female mold 100 and the male mold 200 cooperate to form a closed cavity, the cavity of which is shaped like a contact lens.

[0057] The outer peripheral surface of the male mold 200 has four outer peripheral vertical surfaces 230, each of which is parallel to the central axis of the male mold 200. The four outer peripheral vertical surfaces 230 are connected sequentially along the height direction of the male mold 200. Along the direction closest to the outer arc surface 210 (i.e.... Figure 1 (In the downward direction), the outer diameters of the four outer circumferential vertical surfaces 230 gradually decrease to form a step at the connection between two adjacent outer circumferential vertical surfaces 230. In this embodiment, the outer circumferential surface of the mold 200 forms three steps, with the outer diameter of the outer circumferential vertical surface 230 closest to the outer arc surface 210 being the smallest.

[0058] In this embodiment, the thickness of the boss 220 near the opening 110 is less than the thickness of the boss 220 away from the opening 110. A first inclined surface 240 is formed on the side of the boss 220 facing the outer peripheral surface of the male mold 200, and the side of the first inclined surface 240 away from the opening 110 abuts against the outer peripheral surface of the male mold 200. The thickness of the boss 220 near the opening 110 is c, and the thickness of the boss 220 away from the opening 110 is a. The value of c / a is greater than or equal to 0 and less than 0.6. The sidewall of the cavity is an inner circumferential vertical surface 140, and the angle between the first inclined surface 240 and the inner circumferential vertical surface 140 is γ, with γ ranging from 3° to 7°.

[0059] In one specific embodiment of this utility model, such as Figures 11 to 12As shown, the contact lens mold includes a female mold 100 and a male mold 200. The female mold 100 has a cavity inside, with an opening 110 on one side. The bottom of the cavity has an inner arc surface 120, and the connection between the inner arc surface 120 and the side wall of the cavity forms a female mold cutting edge 130. One end of the male mold 200 has an outer arc surface 210, which is inserted into the cavity, and the outer arc surface 210 abuts against the female mold cutting edge 130. Multiple bosses 220 are spaced circumferentially on the outer periphery of the male mold 200. Each boss 220 has the same shape and size, and the distance between adjacent bosses 220 is equal. A groove is formed between adjacent bosses 220, thus forming an effective cavity channel to ensure that excess lenses overflow through the groove. The female mold 100 and the male mold 200 cooperate to form a closed cavity, which is shaped like a contact lens.

[0060] The difference between this embodiment and the first specific embodiment is that the sidewall of the cavity in this embodiment is a second inclined surface 150, and the angle between the second inclined surface 150 and the outer circumferential vertical surface 230 is β, with the value of β ranging from 3° to 7°.

[0061] The outer peripheral surface of the male mold 200 has four outer peripheral vertical surfaces 230, each of which is parallel to the central axis of the male mold 200. The four outer peripheral vertical surfaces 230 are connected sequentially along the height direction of the male mold 200. Along the direction closest to the outer arc surface 210 (i.e.... Figure 1 (In the downward direction), the outer diameters of the four outer circumferential vertical surfaces 230 gradually decrease to form a step at the connection between two adjacent outer circumferential vertical surfaces 230. In this embodiment, the outer circumferential surface of the mold 200 forms three steps, with the outer diameter of the outer circumferential vertical surface 230 closest to the outer arc surface 210 being the smallest.

[0062] Multiple bosses 220 are located on the outer circumferential vertical surface 230 near the outer arc surface 210. The thickness of the boss 220 at the end near the opening 110 is greater than the thickness of the end away from the opening 110. A first inclined surface 240 is formed on the side of the boss 220 facing the sidewall of the cavity. The side of the first inclined surface 240 near the opening 110 abuts against the sidewall of the cavity, so that part of the first inclined surface 240 abuts against the sidewall of the cavity. In this embodiment, the thickness of the boss 220 at the end near the opening 110 is 'a', and the thickness of the boss 220 at the end away from the opening 110 is 'c'. The value of c / a is greater than or equal to 0 and less than 0.6. The sidewall of the cavity is an inner circumferential vertical surface 140. The angle between the first inclined surface 240 and the inner circumferential vertical surface 140 is γ, and the value of γ ranges from 3° to 7°.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A contact lens mold, characterized in that, include: The mother mold (100) has a cavity inside, and the cavity forms an opening (110) on one side of the mother mold (100). The bottom of the cavity has an inner arc surface (120), and the connection between the inner arc surface (120) and the side wall of the cavity forms a mother mold cutting point (130). A male mold (200) has an outer arc surface (210) at one end, and the male mold (200) is inserted into the cavity. The outer arc surface (210) abuts against the female mold cutting edge (130). The outer peripheral surface of the male mold (200) is provided with a plurality of bosses (220) spaced apart along the circumferential direction, and the bosses (220) abut against the side wall of the cavity; Alternatively, the sidewall of the cavity may be provided with a plurality of protrusions (220) spaced apart circumferentially, and the protrusions (220) abut against the outer peripheral surface of the male mold (200).

2. The contact lens mold according to claim 1, characterized in that, The outer peripheral surface of the male mold (200) has a plurality of outer peripheral vertical surfaces (230), and the plurality of outer peripheral vertical surfaces (230) are connected sequentially along the height direction of the male mold (200).

3. The contact lens mold according to claim 2, characterized in that, Along the direction close to the outer arc surface (210), the outer diameter of the plurality of outer circumferential vertical surfaces (230) gradually decreases to form a step at the connection of two adjacent outer circumferential vertical surfaces (230).

4. The contact lens mold according to claim 2, characterized in that, When the boss (220) is provided on the outer peripheral surface of the male mold (200), the boss (220) is located on the outer peripheral vertical surface (230) near the outer arc surface (210). The thickness of the boss (220) near the opening (110) is greater than the thickness of the boss (220) away from the opening (110). The boss (220) forms a first inclined surface (240) on the side facing the cavity sidewall. The side of the first inclined surface (240) near the opening (110) abuts against the sidewall of the cavity.

5. The contact lens mold according to claim 4, characterized in that, The thickness of the boss (220) near the opening (110) is a, and the thickness of the boss (220) away from the opening (110) is c. The value of c / a is greater than or equal to 0 and less than 0.

6.

6. The contact lens mold according to claim 4 or 5, characterized in that, The sidewall of the cavity is an inner circumferential vertical surface (140), and the angle between the first inclined surface (240) and the inner circumferential vertical surface (140) is α, with the value of α ranging from 3° to 7°.

7. The contact lens mold according to claim 4 or 5, characterized in that, The sidewall of the cavity is a second inclined surface (150), and the angle between the second inclined surface (150) and the outer circumferential vertical surface (230) is β, with the value of β ranging from 3° to 7°.

8. The contact lens mold according to claim 2 or 3, characterized in that, When the boss (220) is provided on the side wall of the cavity, the thickness of the boss (220) near the opening (110) is less than the thickness of the boss (220) away from the opening (110). The boss (220) forms a first inclined surface (240) on the side facing the outer peripheral surface of the male mold (200). The side of the first inclined surface (240) away from the opening (110) abuts against the outer peripheral surface of the male mold (200).

9. The contact lens mold according to claim 8, characterized in that, The thickness of the boss (220) near the opening (110) is c, and the thickness of the boss (220) away from the opening (110) is a. The value of c / a is greater than or equal to 0 and less than 0.

6.

10. The contact lens mold according to claim 8, characterized in that, The sidewall of the cavity is an inner circumferential vertical surface (140), and the angle between the first inclined surface (240) and the inner circumferential vertical surface (140) is γ, with the value of γ ranging from 3° to 7°.

Images