Contact lens mold

Abstract

The application relates to the field of ophthalmic medical devices, and provides a contact lens mold, in particular a contact lens mold. The contact lens mold comprises a male mold, a female mold matched with the male mold and surrounding a forming cavity, one of the male mold and the female mold serving as a mounting half mold and the other serving as a connecting half mold, a limiting connecting piece connected to one end of the mounting half mold and extended and fixed on the surface of the connecting half mold after force deformation to limit the relative position of the male mold and the female mold, and the limiting connecting piece is provided in multiple, and the multiple limiting connecting pieces are uniformly or symmetrically distributed along the circumferential direction of the mounting half mold. The contact lens mold provided by the application can effectively solve the problem of low positioning precision of a pin in the prior art, improve the positioning precision of the mold, and ensure the coaxiality between two mold components.

Description

Technical Field

[0001] This application relates to the field of ophthalmic medical devices, and more particularly to a contact lens mold. Background Technology

[0002] In the field of contact lens manufacturing, the precise fit and positioning of the mold are the core factors determining lens quality. Traditional manufacturing processes for contact lens molds have the following problems: Traditional molds use crude methods such as pin positioning, resulting in a coaxiality error generally >0.15mm, causing optical center misalignment (the industry standard requires ≤0.1mm), which in turn leads to problems such as visual deviation for the wearer. Utility Model Content

[0003] This application provides a contact lens mold to solve the problem of low pin positioning accuracy in the prior art, improve the positioning accuracy of the mold, and ensure the coaxiality between the two mold components.

[0004] According to a first aspect embodiment of this application, a contact lens mold includes:

[0005] punch;

[0006] A concave mold, which cooperates with the convex mold and surrounds it to form a molding cavity; one of the convex mold and the concave mold serves as an installation half mold and the other serves as a connecting half mold.

[0007] A limiting connector has one end connected to the mounting half mold, and the other end extends and is fixed to the surface of the connecting half mold after being deformed by force, so as to limit the relative position of the punch and the die; multiple limiting connectors are provided, and the multiple limiting connectors are evenly or symmetrically distributed along the circumferential direction of the mounting half mold.

[0008] According to one embodiment of this application, the end of the limiting connector is provided with a limiting portion, the connecting half mold is provided with a limiting groove, and the limiting portion is disposed in the limiting groove to prevent the limiting connector from disengaging from the connecting half mold.

[0009] According to one embodiment of this application, along the mold opening or closing direction of the punch and the die, at least a portion of the inner and outer surfaces of the limiting groove that mate with the limiting part are configured as inclined surfaces, and the inclined surfaces restrict the limiting part from disengaging from the limiting groove.

[0010] According to one embodiment of this application, the upper end of the die is provided with an outer edge;

[0011] One end of the limiting connector is fixed to the outer edge, and the other end is connected to the surface of the punch; or, one end of the limiting connector is fixed to the surface of the punch, and the other end is connected to the outer edge.

[0012] According to one embodiment of this application, one end of the limiting connector is fixed to the outer edge, and the other end is connected to the outer surface of the punch.

[0013] One end of the limiting connector is fixed to the outer peripheral surface of the outer edge; the inner wall of the opening end of the punch is provided with the limiting groove, and the limiting part extends to the limiting groove and abuts and is fixed.

[0014] According to one embodiment of this application, one end of the limiting connector is fixed to the surface of the punch, and the other end is connected to the outer edge;

[0015] One end of the limiting connector is fixed to the outer surface of the opening end of the punch; the lower surface of the outer edge is provided with the limiting groove, and the limiting part extends into the limiting groove and is locked in place.

[0016] According to one embodiment of this application, an anti-slip structure is provided on the surface of the limiting part that contacts the limiting groove, and / or an anti-slip structure is provided on the wall surface of the limiting groove that contacts the limiting part.

[0017] According to one embodiment of this application, the anti-slip structure includes one or more combinations of anti-slip texture, anti-slip coating, and magnetic fastening components.

[0018] According to one embodiment of this application, the limiting connector is made of plastic, rubber, or shape memory metal.

[0019] According to one embodiment of this application, the end of the limiting connector is provided with a connecting portion, and the connecting portion is provided with the limiting portion, which is a protruding structure with a rectangular or trapezoidal cross-section;

[0020] Alternatively, the limiting part may be a protruding structure with a triangular cross-section.

[0021] According to one embodiment of this application, when the other end of the limiting connector is fixed to the surface of the connecting half mold, the limiting connector is arc-shaped, or the limiting connector is zigzag-shaped.

[0022] The above-described one or more technical solutions in the embodiments of this application have at least one of the following technical effects:

[0023] The contact lens mold in this application uses limiting connectors to connect and limit the punch and die, thereby improving the coaxiality of the punch and die during mating and thus improving their assembly accuracy. This ensures uniform force distribution around the molding cavity, resulting in more accurate contact lens dimensions and reduced defect rates. Multiple limiting connectors are evenly or symmetrically distributed circumferentially in the mounting half-mold. These connectors provide fastening force through deformation under stress, ensuring that each connector provides the same fastening force. Unlike existing pin pre-tightening methods, this avoids the defect of varying fastening forces caused by different numbers of turns of the pins.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the contact lens mold provided in this application. Figure 1 (The number of limiting connectors is two; one end of the limiting connector is fixed to the surface of the punch; front view).

[0027] Figure 2 This is a schematic diagram of the structure of the contact lens mold provided in this application. Figure 2 (The number of limiting connectors is two; one end of the limiting connector is fixed to the surface of the punch; sectional view).

[0028] Figure 3 This is a schematic diagram of the structure of the die provided in this application.

[0029] Figure 4 This is a schematic diagram of the structure of the limiting connector provided in this application. Figure 1 (The limiting part is a protruding structure with a rectangular cross-section).

[0030] Figure 5 This is a schematic diagram of the structure of the limiting connector provided in this application. Figure 2 (The limiting part is a protruding structure with a right-angled trapezoidal cross-section).

[0031] Figure 6 This is a schematic diagram of the structure of the limiting connector provided in this application. Figure 3 (The limiting part is a protruding structure with an isosceles trapezoidal cross section).

[0032] Figure 7 This is a schematic diagram of the structure of the contact lens mold provided in this application. Figure 3 (The number of limiting connectors is two; one end of the limiting connector is fixed on the outer edge of the die cavity; front view).

[0033] Figure 8 This is a schematic diagram of the structure of the contact lens mold provided in this application. Figure 4 (The number of limiting connectors is two; one end of the limiting connector is fixed on the outer edge of the die cavity; sectional view).

[0034] Figure 9 This is a schematic diagram of the structure of the limiting connector provided in this application. Figure 4 (The limiting part is a protruding structure with a triangular cross-section).

[0035] Figure 10 This is a schematic diagram of the structure of the contact lens mold provided in this application. Figure 5 (The number of limiting connectors is three; one end of the limiting connector is fixed to the surface of the punch; top view).

[0036] Figure 11 This is a schematic diagram of the structure of the contact lens mold provided in this application. Figure 6 (The number of limiting connectors is four; one end of the limiting connector is fixed to the surface of the punch; top view).

[0037] Figure label:

[0038] 1. Punch; 2. Die; 21. Outer edge; 3. Limiting connector; 31. Limiting part; 32. Connecting part; 4. Limiting groove; 5. Forming cavity. Detailed Implementation

[0039] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0040] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application 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 application. 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.

[0041] In the description of the embodiments of this application, 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 application based on the specific circumstances.

[0042] In the embodiments of this application, unless otherwise expressly 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.

[0043] 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 embodiments of this application. 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.

[0044] Currently, the traditional process in the production of thermoset contact lenses still has the following problems: 1. Monomer injection error: The dosage control is not precise when manually injecting monomers, and the low precision of the mold mating leads to gaps (typical gap value > 0.1mm) due to uneven liquid pressure on the mold mating surfaces; 2. High temperature deformation risk: After the gap is formed, the monomer expands at high temperature, generating lateral pressure (about 0.5 - 1.2MPa), which can cause the axial offset of the mold to reach more than 0.2mm, and the thickness deviation of the lens center to exceed ±0.05mm.

[0045] A contact lens mold according to an embodiment of the first aspect of this application, such as Figures 1 to 11As shown, the contact lens mold includes: a punch 1; a die 2, which mates with the punch 1 and forms a molding cavity 5, in which the lens is molded; one of the punch 1 and the die 2 serves as an mounting half-mold, and the other as a connecting half-mold; a limiting connector 3, one end of which is connected to the mounting half-mold, and the other end, after being deformed by force, extends and is fixed to the surface of the connecting half-mold to limit the relative position of the punch 1 and the die 2; multiple limiting connectors 3 are provided, and the multiple limiting connectors 3 are evenly or symmetrically distributed along the circumferential direction of the mounting half-mold. The above contact lens mold can be used as a contact lens mold.

[0046] It should be noted that "multiple" here refers to two or more.

[0047] For example, the multiple limiting connectors 3 can be evenly distributed along the circumferential direction of the mounting half-mold, or symmetrically arranged on the mounting half-mold. Of course, the multiple limiting connectors 3 can also be non-uniformly distributed along the circumferential direction of the mounting half-mold. By calculating the installation position of the limiting connectors 3 and the magnitude of the force required at each installation position, the shape, size, and other parameters of the limiting connectors 3 can be adjusted to ensure that the fastening force on the mounting half-mold and the connecting half-mold is evenly distributed in the circumferential direction. The following explanation uses the example of "multiple limiting connectors 3 being evenly distributed along the circumferential direction of the mounting half-mold" for illustration.

[0048] Multiple limiting connectors 3 are evenly distributed along the circumferential direction of the mounting half-die, and each limiting connector 3 provides a fastening force through deformation under stress, ensuring that each limiting connector 3 provides the same fastening force at all positions in the circumferential direction, thus achieving uniform fastening of the punch 1 and the die 2. Unlike existing pin pre-tightening methods, this avoids the defect of different fastening forces caused by different numbers of turns of each pin, thereby making the force on the punch 1 and the die 2 more balanced at all positions in the circumferential direction, effectively reducing the fitting clearance caused by excessive or insufficient local fastening force, and thus improving the coaxiality of the punch 1 and the die 2 when they are fitted together.

[0049] The improved coaxiality directly enhances the assembly precision of the punch 1 and die 2, making the shape of the molding cavity 5 more closely match the design parameters. The molding cavity 5 can evenly withstand the pressure generated by the internal monomers during the curing process, as well as the external forces applied. This uniform stress state avoids the local deformation of the molding cavity 5 caused by assembly deviations in traditional molds, ensuring that the thickness of each part of the contact lens remains consistent during the molding process, and the position of the optical center is more precise. Ultimately, this results in more accurate dimensions of the molded contact lenses, reducing the defect rate caused by dimensional deviations or substandard optical performance.

[0050] According to one embodiment of this application, such as Figure 2 , Figure 3 and Figure 8As shown, the end of the limiting connector 3 is provided with a limiting part 31, and the connecting half mold is provided with a limiting groove 4. The limiting part 31 is disposed in the limiting groove 4 to prevent the limiting connector 3 from separating from the connecting half mold.

[0051] A limiting part 31 is provided at the end of the limiting connector 3, and a limiting groove 4 is provided on the connecting half mold. Placing the limiting part 31 in the limiting groove 4 can effectively prevent the limiting connector 3 from separating from the connecting half mold. When the limiting connector 3 is deformed under force and fixed to the connecting half mold, the limiting part 31 enters the limiting groove 4. The limiting groove 4 constrains the limiting part 31, so that when the limiting connector 3 is subjected to external tensile force or vibration, the limiting part 31 cannot easily detach from the limiting groove 4, thereby ensuring a more stable connection between the limiting connector 3 and the connecting half mold.

[0052] The structure of the limiting part 31 cooperating with the limiting groove 4 enhances the limiting effect of the limiting connector 3 on the punch 1 and the die 2, preventing the punch 1 and die 2 from loosening due to accidental disengagement of the limiting connector 3 during mold use, thereby maintaining the coaxiality and assembly accuracy of the punch 1 and die 2 during the fit. A stable fit ensures that the shape of the molding cavity 5 remains stable. During monomer injection and high-temperature curing, the molding cavity 5 will not deform or develop gaps due to mold loosening, allowing the contact lens to be evenly stressed during molding. This further guarantees the dimensional accuracy and optical performance of the molded contact lens, reducing defective products caused by unstable mold connections.

[0053] According to one embodiment of this application, along the mold opening or closing direction of the punch 1 and the die 2, at least a portion of the inner and outer surfaces of the limiting groove 4 that cooperate with the limiting part 31 are set as inclined surfaces, and the inclined surfaces restrict the limiting part 31 from disengaging from the limiting groove 4.

[0054] In practical applications, the inner wall of the limiting groove 4 can be designed as a slightly inclined slope (e.g., Figure 5 and Figure 6 As shown, the side of the limiting part 31 is designed as an inclined surface adapted to the inclined surface. When the limiting part 31 enters the limiting groove 4, the cooperation between the inclined surfaces can generate a certain locking force, improving the limiting effect. As an example and not a limitation, for example, at least a portion of the inner or outer surface of the limiting groove 4 and the limiting part 31 that cooperates along the mold opening or closing direction of the punch 1 and the die 2 is an inclined surface. The inclined direction is more preferably from the radial inside to the radial outside and from bottom to top. This allows the limiting part 31 to form a similar undercut structure in the assembled state, further increasing the locking force and preventing the punch 1 and the die 2 from separating. For example, the vertical cross-section of the limiting part 31 can be a right-angled trapezoid, an isosceles trapezoid, or a regular trapezoid.

[0055] According to one embodiment of this application, the upper end of the die 2 is provided with an outer edge 21; one end of the limiting connector 3 is fixed to the outer edge 21, and the other end is connected to the surface of the punch 1, such as... Figure 7 and Figure 8 As shown; or, one end of the limiting connector 3 is fixed to the surface of the punch 1, and the other end is connected to the outer edge 21, as shown. Figure 1 and Figure 2 As shown.

[0056] The upper end of the die 2 is provided with an outer edge 21, which provides an outwardly extending fulcrum for fixing the limiting connector 3. This allows the middle main body of the limiting connector 3 to maintain a certain distance from the punch 1 and the die 2, thus preventing the middle main body of the limiting connector 3 from contacting or colliding with the surface of the punch 1 or the die 2 during the deformation process under force, thereby eliminating the possibility of structural interference.

[0057] When the operator needs to connect the other end of the limiting connector 3 to the connecting half mold, since the middle main body of the limiting connector 3 does not interfere with the punch 1 or the die 2, the operator's hand or tools can more smoothly contact the connection part, the operating space is more sufficient, and the connection process is more convenient and efficient, reducing the problem of incomplete connection or deviation caused by operational obstruction. At the same time, the outer edge 21 itself has a certain structural strength, which can stably bear the force on the fixed end of the limiting connector 3, ensuring that the limiting connector 3 will not shake due to the instability of the fixed point when providing fastening force, thus ensuring both operational convenience and maintaining the reliability of the limiting connection.

[0058] In some cases, the outer edge 21 may also be set at the upper end of the punch 1.

[0059] According to one embodiment of this application, one end of the limiting connector 3 is fixed to the outer edge 21, and the other end is connected to the outer surface of the punch 1; as shown... Figure 7 and Figure 8 As shown, one end of the limiting connector 3 is fixed on the outer peripheral surface of the outer edge 21; the inner wall of the opening end of the punch 1 is provided with a limiting groove 4, and the limiting part 31 extends to the limiting groove 4 and abuts and is fixed.

[0060] The outer periphery of the outer edge 21 provides an outwardly extending fixed base point for the limiting connector 3, allowing the middle main body of the limiting connector 3 to naturally open outward and maintain a certain distance from the outer walls of the punch 1 and the die 2. This effectively avoids contact or friction between the limiting connector 3 and the surfaces of the punch 1 and the die 2 during deformation under stress, reducing the possibility of structural interference. At the same time, the limiting groove 4 on the inner wall of the opening end of the punch 1 provides an internal constraint space for the end of the limiting connector 3. When the limiting part 31 abuts and is fixed in the limiting groove 4, the inner side wall of the limiting groove 4 will support the limiting part 31, allowing the fastening force of the limiting connector 3 to be transmitted downward along the punch 1. This enhances the constraint effect when the punch 1 and the die 2 are engaged, further improving the coaxiality of their engagement. Furthermore, since the middle part of the limiting connector 3 does not interfere with the mold body, the operator's hand or tools can more smoothly contact the mating part of the limiting part 31 and the limiting groove 4 when performing the connection operation, which facilitates observation and operation, reduces assembly difficulty, and improves assembly efficiency.

[0061] In some cases, the inner wall of the opening end of the punch 1 can also be set as an annular boss. The annular boss extends circumferentially, and the limiting part 31 at the end of the limiting connector 3 is set as a hook that matches the annular boss. The hook is hooked on the annular boss to achieve fixation.

[0062] According to one embodiment of this application, one end of the limiting connector 3 is fixed to the surface of the punch 1, and the other end is connected to the outer edge 21; as Figure 1 and Figure 2 As shown, one end of the limiting connector 3 is fixed to the outer surface of the opening end of the punch 1; a limiting groove 4 is provided on the lower surface of the outer edge 21, and the limiting part 31 extends into the limiting groove 4 and is locked in place.

[0063] The outer surface of the opening end of the punch 1 provides an outwardly extending fixed base point for the limiting connector 3, allowing the middle main body of the limiting connector 3 to naturally unfold outward and maintain a certain distance from the side walls of the punch 1 and the die 2, effectively preventing the limiting connector 3 from contacting and interfering with the mold body during deformation under force or assembly.

[0064] The limiting groove 4 on the lower surface of the outer edge 21 provides a precise positioning space for the limiting part 31. When the limiting part 31 is engaged in the limiting groove 4, the groove wall of the limiting groove 4 will form vertical and lateral constraints on the limiting part 31, ensuring that the limiting connector 3 will not fall off or shift when subjected to fastening force. This not only ensures the reliability of the connection, but also provides the operator with sufficient operating space, making it easy to observe and complete the engagement action, and reducing operational obstacles during the assembly process.

[0065] At the same time, this layout allows the fastening force of the limiting connector 3 to be transmitted radially outward to the outer edge 21 along the punch 1, and then evenly distributed to the die 2 through the outer edge 21, avoiding local force concentration, which helps to maintain the coaxiality of the punch 1 and the die 2 when they are engaged, ensuring the shape stability of the molding cavity 5, and thus improving the molding accuracy of contact lenses.

[0066] When the limiting part 31 extends into the limiting groove 4 for snap-fit ​​fixation, the limiting part 31 and the limiting groove 4 can be an interference fit, which helps to restrict the limiting part 31 from disengaging from the limiting groove 4.

[0067] In some cases, a downwardly protruding locking block can be provided on the lower surface of the outer edge 21, and a locking slot adapted to the locking block can be provided at the end of the limiting connector 3, so that the limiting structure is formed by the locking slot and the locking block engaging.

[0068] According to one embodiment of this application, an anti-slip structure is provided on the surface of the limiting part 31 that contacts the limiting groove 4, and / or an anti-slip structure is provided on the wall surface of the limiting groove 4 that contacts the limiting part 31.

[0069] Anti-slip structures are provided on the surface where the limiting part 31 contacts the limiting groove 4 and on the wall surface where the limiting groove 4 contacts the limiting part 31, which can effectively prevent the limiting part 31 and the limiting groove 4 from sliding relative to each other.

[0070] When the limiting part 31 is located in the limiting groove 4, the double-sided anti-slip structure increases the friction coefficient of the contact interface, which significantly improves the friction between the two and forms a double anti-slip guarantee. This not only strengthens the stability of the limiting part 31 in the limiting groove 4, but also effectively resists the loosening tendency of the mold caused by vibration, temperature change or external load during use.

[0071] The double-sided anti-slip structure makes the fastening effect of the limiting connector 3 on the punch 1 and the die 2 more reliable, ensuring that the two maintain a precise relative position during the fit, thereby maintaining the shape stability of the molding cavity 5, reducing the dimensional deviation of the contact lens molding caused by loosening of the limiting connector, and improving the product qualification rate. Furthermore, the complementary effect of the double-sided anti-slip structure reduces the dependence on the anti-slip performance of a single surface. Even if the anti-slip structure on one surface shows slight wear due to long-term use, the anti-slip structure on the other surface can still maintain sufficient friction, extending the service life of the mold and improving the durability of the structure.

[0072] According to one embodiment of this application, the anti-slip structure includes one or more combinations of anti-slip texture, anti-slip coating, and magnetic fastening components.

[0073] The anti-slip structure includes one or more combinations of anti-slip texture, anti-slip coating, and magnetic fixing components, which can improve the anti-slip performance between the limiting part 31 and the limiting groove 4 through multi-dimensional action. The anti-slip texture can be a regular texture or an irregular texture.

[0074] The anti-slip texture increases mechanical interlocking by creating an uneven surface on the contact surface, physically hindering the relative movement of the limiting part 31 and the limiting groove 4. The anti-slip coating directly increases the interfacial friction coefficient by covering the contact surface with a material of high friction coefficient. The magnetic fixing component uses magnetic force to generate additional pressure, enhancing the tightness of the fit between the two and indirectly increasing friction. The above anti-slip structures can be used in combination, with different anti-slip mechanisms working together to resist the sliding tendency through mechanical interlocking and surface friction, while also ensuring stable contact pressure through magnetic force, significantly reducing the probability of relative sliding between the limiting part 31 and the limiting groove 4.

[0075] The combined and synergistic design adapts to different usage scenarios. When the mold is subjected to vibration, temperature changes, or lateral forces, it can exert a composite anti-slip effect according to the force characteristics, maintain the reliability of the limiting connection, ensure the fitting accuracy of punch 1 and die 2, and thus guarantee the stability of the contact lens molding dimensions, reducing product defects caused by anti-slip failure. At the same time, the flexibility of the combination form allows for adjustments to the structural combination according to factors such as mold material and usage environment, improving the design adaptability.

[0076] In some cases, other anti-slip structures can be used, such as a vacuum suction cup assembly. By adding a vacuum suction cup between the limiting part 31 and the limiting groove 4, the limiting part 31 and the limiting groove 4 can be tightly fitted together, improving the anti-slip effect. Alternatively, staggered wedge-shaped protrusions and grooves can be provided on the contact surfaces of the limiting part 31 and the limiting groove 4, respectively. When the two are engaged, the wedge-shaped structures interlock to form a mechanical fit. Alternatively, an expandable sealing ring can be provided between the contact interface of the limiting part 31 and the limiting groove 4. The sealing ring expands to fill the gap after being compressed, increasing the contact pressure and friction to achieve an anti-slip effect.

[0077] According to one embodiment of this application, the limiting connector 3 is made of plastic, rubber, or shape memory metal.

[0078] The limiting connector 3 is made of plastic, rubber, or shape memory metal, providing suitable mechanical properties according to the mold's usage requirements, and meeting the requirements for deformation capacity, fastening force, and stability during the limiting connection process. Plastic material has good moldability and can be formed into complex structural shapes through injection molding, making it suitable for manufacturing limiting connectors 3 with specific limiting structures. Furthermore, plastic itself has a certain elastic deformation capacity, allowing it to deform appropriately under stress to conform to the surface of the connecting half-mold, achieving stable fixation. Rubber material has excellent elasticity and flexibility, generating continuous rebound force after deformation under stress, making the contact between the limiting connector 3 and the connecting half-mold tighter, effectively resisting loosening caused by vibration or temperature changes. Simultaneously, the high surface friction coefficient of rubber enhances the anti-slip effect between the rubber and mating parts. Shape memory metal, after deformation under stress, can return to its initial shape when temperature changes or external force is removed. This characteristic allows the limiting connector 3 to maintain stable fastening force during multiple uses, making it particularly suitable for mold scenarios requiring repeated disassembly and assembly, extending the mold's service life; of course, the mold can also be a disposable material.

[0079] In some cases, the material of the limiting connector 3 can be further optimized. For example, fiber reinforcement materials can be added to the plastic to improve its strength and fatigue resistance, making it suitable for mold structures subjected to high stress. Alternatively, silicone composite materials can be used. Silicone has good biocompatibility and chemical resistance, making it suitable for molds related to contact lens molding, thus avoiding material contamination of the lenses.

[0080] According to one embodiment of this application, the end of the limiting connector 3 is provided with a connecting portion 32, and a limiting portion 31 is provided on the connecting portion 32. The limiting portion 31 is a protruding structure with a rectangular or trapezoidal cross-section, such as... Figure 4 The diagram shows the case where the limiting part 31 has a rectangular cross-section. Figure 5 In the case where the cross-section of the limiting part 31 is a right-angled trapezoid, Figure 6 The limiting part 31 has an isosceles trapezoidal cross-section; or, the limiting part 31 is a protruding structure with a triangular cross-section, such as... Figure 9 As shown.

[0081] It should be noted that, Figure 4 The limiting connector 3 in the middle is Figure 1 and Figure 2 Limiting connector 3 in the middle, Figure 9 The limiting connector 3 in the middle is Figure 7 and Figure 8 Limiting connector 3 in the middle. Figure 4 and Figure 9 The main body of the limiting connector 3 is linear and is in a non-stressed state; while Figure 1 , Figure 2 , Figure 7 and Figure 8 The limiting connector 3 in the middle bends into the shape shown in the figure after being subjected to force.

[0082] The limiting part 31 adopts a raised structure with a rectangular or trapezoidal cross section, or a raised structure with a triangular cross section, which can form a stable fit with the limiting groove 4 and effectively limit the relative displacement between the limiting connector 3 and the connecting half mold.

[0083] When the limiting part 31 is a rectangular or trapezoidal protrusion, the limiting part 31 remains stable when subjected to forces in all directions, avoiding tilting or loosening due to excessive local force.

[0084] When the limiting part 31 is a triangular protrusion, the amount of material used can be reduced to a certain extent, and the limiting part 31 also has better bending performance.

[0085] In some cases, the cross-section of the limiting part 31 may also be partially circular or other shapes.

[0086] According to one embodiment of this application, when the other end of the limiting connector 3 is fixed to the surface of the connecting half mold, the limiting connector 3 is arc-shaped, such as... Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown; or, the limiting connector 3 is in the shape of a broken line (not shown in the figure).

[0087] When the other end of the limiting connector 3 is fixed to the surface of the connecting half mold, the limiting connector 3 is in the shape of an arc or a broken line, and its unique geometric shape can optimize the limiting fit with the connecting half mold.

[0088] The arc shape effectively disperses external forces. When the mold is subjected to vibration, impact, or temperature changes, the arc absorbs energy through deformation, reducing stress concentration and preventing the breakage of the limiting connector 3, thus ensuring long-term reliability. When the limiting connector 3 is in the shape of a broken line, the corners of the broken line form rigid support points. The straight segments work together to construct a multi-directional constraint system. The rigidity of the straight segments forms a clear orientation restriction on the connecting half mold, preventing its horizontal, vertical, or oblique displacement. Especially in areas of the mold that require precise positioning, the segmented broken line structure can directly adapt to the protrusions, grooves, and other features of the connecting half mold, improving the positioning accuracy and ensuring the positional accuracy of the engagement between the punch 1 and the die 2, thus stabilizing the molding size and quality of the contact lenses.

[0089] The following are exemplary illustrations of the dimensional data for the limiting connector 3:

[0090] like Figure 1 and Figure 2As shown, two limiting connectors 3 are provided on the edge of the punch 1. The angle between the two limiting connectors 3 is 180°. The height L1 of the limiting part 31 of the limiting connector 3 can be 1.5mm, L2 can be 0.8mm, L3 can be 2mm, L4 can be 0.8mm, L5 can be 7mm, and L6 can be 8.5mm. The corners of the limiting part 31 on the limiting connector 3 can be right angles, that is, the angle between the limiting part 31 and the main body of the limiting connector 3 is 90° (in the non-stressed state). After the punch 1 and the die 2 are assembled, the radial clearance is ≤0.02mm. An axial pressure of 0.5~1N is applied to complete the assembly; during the high-temperature curing process, the hook tension maintains the mold coaxiality error ≤0.07mm.

[0091] like Figure 7 and Figure 8 As shown, two limiting connectors 3 are provided on the edge of the die 2. The angle between the two limiting connectors 3 is 180°. L7 can be 1.35mm, L8 can be 7.5mm, and L9 can be 10.5mm.

[0092] like Figure 10 As shown, three limiting connectors 3 are evenly distributed along the edge of the punch 1, with an included angle of 120° between adjacent limiting connectors 3. The limiting part 31 of the limiting connector 3 can be in the form of a hook; suitable for molds with a diameter ≥14mm. A single hook provides a tensile force of 2N, and the total radial constraint force is 6N. The thickness deviation of the lens center is controlled within ±0.03mm, which is a significant improvement over traditional processes. Of course, the three limiting connectors 3 can also be installed on the die 2.

[0093] like Figure 11 As shown, four limiting connectors 3 are evenly distributed along the edge of the punch 1, with an included angle of 90° between adjacent limiting connectors 3. This design is suitable for high-precision lens production (center thickness tolerance ≤ ±0.02mm). Each hook provides a tensile force of 2–3N, with a total radial constraint force of 8–12N. The lens center thickness deviation is controlled within ±0.03mm, representing a significant improvement over traditional processes. Alternatively, the four limiting connectors 3 can also be mounted on the die 2.

[0094] The eyeglass mold provided in this application embodiment has gap control and real-time coaxial control functions, which can achieve high precision, high efficiency and high yield in lens production, specifically reflected in the following aspects:

[0095] I. Improved Mold Coaxiality: Real-time coaxial calibration during mold assembly reduces center offset errors and ensures the optical center accuracy of lenses. II. Adaptation to Existing Production Lines: Modular design is compatible with traditional thermosetting equipment, enabling low-cost technological upgrades without altering core processes, thus driving improvements in both production efficiency and quality across the industry. III. Resolution of Mold Clearance Issues Caused by Pressure: The asymmetric pressure generated by monomer expansion during curing heating can be offset by the tightening force applied by the limiting connectors, keeping the clearance between the punch and die within the allowable error range. This ensures that the monomer thickness becomes more uniform throughout the expansion process, eliminating thickness deviations. IV. Convenient and Quick Manual Operation.

[0096] The eyeglass mold provided in this application uses symmetrically distributed limiting connectors to generate uniform radial tension, which counteracts the asymmetric pressure (0.5 - 1.2 MPa) generated by the expansion of the individual components. This stabilizes the mold gap within 0.02 mm, ensuring uniform stress around the molding cavity and resulting in more accurate dimensions of the molded contact lenses, thus reducing the defect rate. The tension of the limiting connectors forces the edges of the convex and concave molds to align. Combined with symmetrically distributed geometric constraints (e.g., two limiting connectors symmetrically distributed at 180°; or three connectors with an angle of 120° between adjacent connectors), the coaxiality error is reduced from 0.15 mm in traditional processes to below 0.07 mm, meeting the industry standard of optical center offset ≤0.1 mm. This results in more accurate alignment of the concave and convex molds and more precise coaxial dimensions.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application and should be covered within the scope of the claims of this application.

Claims

1. A contact lens mold, characterized in that, include: punch (1); The concave mold (2) cooperates with the convex mold (1) and surrounds to form a forming cavity (5); one of the convex mold (1) and the concave mold (2) serves as an installation half mold and the other serves as a connecting half mold; The limiting connector (3) is connected at one end to the mounting half mold, and at the other end, after being deformed by force, it extends and is fixed to the surface of the connecting half mold to limit the relative position of the punch (1) and the die (2); the limiting connector (3) is provided in multiple ways, and the multiple limiting connectors (3) are evenly or symmetrically distributed along the circumferential direction of the mounting half mold.

2. The contact lens mold according to claim 1, characterized in that, The end of the limiting connector (3) is provided with a limiting part (31), and the connecting half mold is provided with a limiting groove (4). The limiting part (31) is disposed in the limiting groove (4) to restrict the limiting connector (3) from separating from the connecting half mold.

3. The contact lens mold according to claim 2, characterized in that, Along the mold opening or closing direction of the punch (1) and the die (2), at least a portion of the inner and outer surfaces of the limiting groove (4) that cooperate with the limiting part (31) are set as inclined surfaces, and the inclined surfaces restrict the limiting part (31) from dislodging from the limiting groove (4).

4. The contact lens mold according to claim 2, characterized in that, The upper end of the die (2) is provided with an outer edge (21); One end of the limiting connector (3) is fixed to the outer edge (21), and the other end is connected to the surface of the punch (1); or, One end of the limiting connector (3) is fixed to the surface of the punch (1), and the other end is connected to the outer edge (21).

5. The contact lens mold according to claim 4, characterized in that, One end of the limiting connector (3) is fixed on the outer edge (21), and the other end is connected to the outer surface of the punch (1); One end of the limiting connector (3) is fixed to the outer peripheral surface of the outer edge (21); the inner wall of the opening end of the punch (1) is provided with the limiting groove (4), and the limiting part (31) extends to the limiting groove (4) and abuts and is fixed.

6. The contact lens mold according to claim 4, characterized in that, One end of the limiting connector (3) is fixed to the surface of the punch (1), and the other end is connected to the outer edge (21); One end of the limiting connector (3) is fixed to the outer surface of the opening end of the punch (1); the lower surface of the outer edge (21) is provided with the limiting groove (4), and the limiting part (31) extends into the limiting groove (4) and is snapped in place.

7. The contact lens mold according to any one of claims 2 to 6, characterized in that, An anti-slip structure is provided on the surface of the limiting part (31) that contacts the limiting groove (4), and / or an anti-slip structure is provided on the wall surface of the limiting groove (4) that contacts the limiting part (31).

8. The contact lens mold according to claim 7, characterized in that, The anti-slip structure includes one or more combinations of anti-slip texture, anti-slip coating, and magnetic fixing components.

9. The contact lens mold according to any one of claims 1 to 6, characterized in that, The limiting connector (3) is a component made of plastic, rubber or shape memory metal.

10. The contact lens mold according to any one of claims 2 to 6, characterized in that, The end of the limiting connector (3) is provided with a connecting part (32), and the connecting part (32) is provided with the limiting part (31). The limiting part (31) is a protruding structure with a rectangular or trapezoidal cross section. Alternatively, the limiting part (31) is a protruding structure with a triangular cross-section.

11. The contact lens mold according to any one of claims 1 to 6, characterized in that, When the other end of the limiting connector (3) is fixed to the surface of the connecting half mold, the limiting connector (3) is arc-shaped, or the limiting connector (3) is zigzag-shaped.

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