Corneal contact lens mold

Abstract

The utility model provides a corneal contact lens mold which can enable excess materials to be reliably reserved at expected positions. In order to achieve the purpose, the corneal contact lens die comprises a female die and a male die, the female die and the male die form a cavity through die assembly, one or more overflow grooves are formed in a first wall part of one of the female die and the male die, the overflow grooves penetrate through the first wall part, and the overflow grooves are formed in a second wall part of the other of the female die and the male die. The overflow groove is used for overflowing raw material liquid discharged from the cavity, the overflow groove comprises a first diameter expanding part, and the diameter of the overflow groove is expanded towards the downstream direction of the overflow through the first diameter expanding part. By the adoption of the structure, due to the fact that the overflow groove comprises the first diameter expanding part, and the diameter of the overflow groove is expanded in the downstream direction of overflow through the first diameter expanding part, an inverted buckling structure can be formed through the first diameter expanding part when redundant raw material liquid is little, and remaining materials can be reliably left on the expected male die or female die.

Description

Technical Field

[0001] The utility model relates to a corneal contact lens mould. Background Art

[0002] There are four major methods for making contact lenses: centrifugal molding, turning molding, compression molding, and mixed process. Among them, compression molding is widely used due to its high processing efficiency, low cost, and good wearing comfort. Compression molding uses ultra-precision processing technology to manufacture metal molds, and then uses metal molds to precisely inject the male and female molds. The female mold is filled with contact lens raw material liquid and then pressed with the male mold. The raw material liquid in the cavity formed by the two is cured by heat or light to obtain dry contact lens lenses, and then hydrated to obtain wet lenses.

[0003] In the prior art, when the molds are separated, the dry contact lens can be left on, for example, the concave mold, while the residual material can be left on the male mold, thereby avoiding the residual material and the dry contact lens remaining on the same side when the male mold and the concave mold are separated to take out the lenses, thereby improving the lens taking rate.

[0004] Yet, reliably making surplus material stay on this point of desired position, prior art also has room for improvement.In addition, this problem not only exists in the mould of contact lens, also is applicable to the mould of other contact lenses. Utility Model Content

[0005] In view of this, the utility model provides a corneal contact lens mold which can reliably keep the residual material at a desired position.

[0006] To achieve the above-mentioned purpose, the corneal contact lens mold of the utility model includes a concave mold and a convex mold, and the concave mold and the convex mold form a cavity by closing the mold. One or more overflow grooves are formed on the first wall portion of one of the concave mold or the convex mold. The overflow groove passes through the first wall portion to allow the raw material liquid discharged from the cavity to overflow. The overflow groove includes a first diameter expansion portion, and the overflow groove is expanded in diameter toward the overflow downstream direction through the first diameter expansion portion.

[0007] With the above structure, since the overflow groove includes a first diameter expansion portion, the overflow groove is expanded toward the downstream direction of the overflow through the first diameter expansion portion. Therefore, when the excess raw material liquid is small, an undercut structure can be formed through the first diameter expansion portion, so that the excess material can be reliably retained on the desired punch or die.

[0008] In addition, the gas can be discharged through the overflow groove to avoid bubbles in the lens.

[0009] As a possible implementation manner, the first diameter-enlarging portion includes an inclined surface or a stepped surface.

[0010] As a possible implementation, the overflow groove is a notch provided on the first outer peripheral surface of the first wall portion and opening toward the outer peripheral side.

[0011] By forming the notch, the excess raw material liquid can reliably flow through the overflow groove, and the excess material can be reliably left at a desired position.

[0012] As a possible implementation manner, the die includes a first inner circumferential surface opposite to the first outer circumferential surface.

[0013] As a possible implementation manner, the first outer circumferential surface is in close contact with the first inner circumferential surface.

[0014] In this way, the male and female dies can be kept in a stable state after being clamped.

[0015] As a possible implementation, the die 2 has an inclined surface located above the first inner circumferential surface.

[0016] In this way, it can play a guiding role when the punch 1 and the die 2 are pressed together, making the mold closing action stable and reliable.

[0017] As a possible implementation manner, the overflow groove includes a through hole.

[0018] As a possible implementation, the overflow groove includes a second diameter expansion portion located on the overflow upstream side of the first diameter expansion portion, and the overflow groove is expanded toward the overflow upstream side through the second diameter expansion portion.

[0019] In this way, the excess raw material liquid can be reliably discharged.

[0020] As a possible implementation manner, the second diameter-enlarging portion includes a slope.

[0021] As a possible implementation, the die includes a first opposing surface opposite to the first wall portion, a first protrusion is provided on the first opposing surface, and a top of the first protrusion supports the first wall portion so that a gap is maintained between the first wall portion and the first opposing surface.

[0022] In this way, the gas or the excess raw material liquid can be discharged reliably.

[0023] As a possible implementation manner, the first protrusion is in a step shape and supports the outer peripheral edge of the first wall portion.

[0024] With the above configuration, the first protrusion structure can be stabilized by forming the first protrusion in a stepped shape, thereby stably supporting the first wall portion.

[0025] As a possible implementation, the first protrusion extends continuously along the circumference of the die. With the above structure, the first protrusion extends continuously along the circumference of the die, thereby being able to reliably and stably support the punch.

[0026] Alternatively, a plurality of the first protrusions are arranged at intervals along the circumferential direction of the die.

[0027] As a possible implementation, the overflow groove includes a straight section, and the straight section is located on the overflow upstream side of the first expanded diameter portion.

[0028] The straight section design is adopted to reliably connect the spaces on both sides of the overflow tank.

[0029] As a possible implementation, the first wall portion is perpendicular to the center line of the punch, and a second protrusion is provided on the upper surface of the first wall portion, and the second protrusion is in a ring shape surrounding the center line.

[0030] A first recessed portion for the pressing head to extend into is formed on the male die, and the first recessed portion is located on the inner side of the second protrusion.

[0031] With the above structure, the second protrusion is provided to isolate the flow of the raw material liquid, thereby preventing the discharged contact lens raw material liquid from contacting the pressing head, causing contamination or adhesion to the pressing head, affecting the pressing accuracy, and further affecting the contact lens production yield.

[0032] As a possible implementation manner, a second recessed portion communicating with the overflow groove is provided on the first wall portion.

[0033] In this way, the raw material liquid overflowing from the overflow tank can be accommodated, so that the solidified residual material can be more reliably retained in the desired position, thereby increasing the stability of the residual material remaining in the desired position.

[0034] As a possible implementation, a mold is pressed for the contact lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The various technical features of the present application and the relationship between them are further explained below with reference to the accompanying drawings. The accompanying drawings are exemplary, and some technical features are not shown in actual proportion. In addition, some drawings may omit technical features that are commonly used in the technical field to which the present application belongs and are not essential for understanding and implementing the present application, or additional technical features that are not essential for understanding and implementing the present application may be shown. In other words, the combination of the various technical features shown in the accompanying drawings is not used to limit the present application. In addition, throughout the present application, the same figure numbers refer to the same content. The specific description of the drawings is as follows:

[0036] Figure 1It is a cross-sectional view of a contact lens mold involved in a specific embodiment of the utility model;

[0037] Figure 2 is a cross-sectional view of the male mold of the contact lens mold;

[0038] Figure 3 is a stereogram of the punch;

[0039] Figure 4 is another stereogram of the punch;

[0040] Figure 5 is a cross-sectional view of a concave mold of the contact lens mold;

[0041] Figure 6 is a three-dimensional diagram of the die;

[0042] Figure 7 It is a schematic diagram for illustrating the process of manufacturing contact lenses using the above-mentioned concave mold and convex mold;

[0043] Figure 8 is another schematic diagram for illustrating the process of manufacturing a contact lens using the above-mentioned concave mold and convex mold;

[0044] Fig. 9 yes Figure 8 The enlarged view of point A in the middle;

[0045] Fig.10 is a stereoscopic view of the punch involved in Modification 1;

[0046] Fig.11 is another stereoscopic view of the punch involved in Modification 1;

[0047] Fig.12 is a cross-sectional view of the punch involved in Modification Example 2;

[0048] Fig.13 is a stereoscopic view of the punch involved in Modification Example 2;

[0049] Fig.14 is a cross-sectional view of the punch involved in Modification Example 3;

[0050] Fig.15 is a stereoscopic view of the punch involved in Modification Example 3;

[0051] Fig.16 is a cross-sectional view of the punch involved in Modification Example 4;

[0052] Fig.17 is a stereoscopic view of the punch involved in Modification Example 4;

[0053] Fig.18 is a cross-sectional view of a contact lens mold according to Modification 5;

[0054] Fig.19 is a three-dimensional diagram of the concave mold involved in Modification Example 6;

[0055] Fig. 20 is a cross-sectional view of a contact lens mold provided in this specification;

[0056] Fig.21 It is a stereoscopic view of the male mold of the contact lens mold.

[0057] Description of Reference Numerals

[0058] 1: punch; 2: die; 3: cavity; 4: excess material channel; 10: wall; 11: cavity convex surface; 12: cutter surface; 13: vertical surface; 14: wall (first wall); 14a: surface (lower surface); 14b: surface (upper surface); 14c: outer peripheral edge; 14d: outer peripheral surface (first outer peripheral surface); 15: notch (overflow groove); 15a: straight section; 15b: enlarged diameter portion (second enlarged diameter portion); 15c: enlarged diameter portion (first enlarged diameter portion); 16: recess (first recess); 17: through hole (overflow groove); 18: protrusion (second protrusion) ); 19 recessed portion (second recessed portion); 20 raised portion; 21 cavity concave surface; 22 cutter portion; 23 horizontal surface; 24 vertical surface; 25 horizontal surface (first opposite surface); 26 step portion (first protrusion); 26A step portion (first protrusion); 27 vertical surface (first inner peripheral surface); 28 inclined surface; 41 channel portion; 42 channel portion; 43 channel portion; 100 contact lens mold; 231 transition surface; S1 accommodating cavity; W1 contact lens raw material liquid; W2 contact lens dry sheet; X1 center line; X2 center line. DETAILED DESCRIPTION

[0059] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0060] First, the contact lens mold of the present invention is described by taking the contact lens mold as an example. It can be understood that the present invention is not only applicable to contact lens molds, but also to other contact lenses such as orthokeratology lens molds.

[0061] Figure 1 1 is a cross-sectional view of a contact lens mold according to a specific embodiment of the present invention. Figure 1 As shown, the contact lens mold 100 is used for molding contact lenses, and has a male mold 1 and a female mold 2. In this embodiment, both are processed by precision injection molding technology, and the injection molding materials used are polystyrene, polypropylene or their mixtures. The male mold 1 and the female mold 2 can be made of the same or different materials.

[0062] During molding, after the contact lens raw material liquid is filled in the concave mold 2, it is pressed together with the convex mold 1. At this time, the convex mold 1 and the concave mold 2 form a cavity 3 by closing the mold. In addition, the convex mold 1 and the concave mold 2 also form a residual material channel 4 outside the cavity 3. Excess raw material liquid overflows from the cavity 3 and enters the residual material channel 4, and is discharged from the residual material channel 4 to the outside of the contact lens mold 100 as described later. The overflowed raw material liquid solidifies to form residual material, and the raw material liquid in the cavity 3 solidifies to form a contact lens dry lens, and the contact lens dry lens is hydrated to obtain a contact lens wet lens.

[0063] In addition, when the male mold 1 and the female mold 2 are in the mold clamping state, Figure 1 The raw material liquid is solidified by radiating light or heat as shown by the arrow in the middle.

[0064] The specific structures of the punch 1 and the die 2 are described in detail below.

[0065] First, the punch 1 will be described. Figure 2 is a cross-sectional view of the male mold of the contact lens mold; Figure 3 is a stereogram of the punch; Figure 4 It is another stereogram of the punch.

[0066] like Figure 2-Figure 4 As shown, the punch 1 is in the shape of a body of revolution with the center line X1 as the center, and has a wall portion 10 and a wall portion 14. The wall portion 10 is generally bowl-shaped, and has a recess 16 when viewed from one side. The wall portion 14 (first wall portion) is in the shape of a circular ring plate perpendicular to the center line X1, and is connected to the upper edge of the wall portion 10, which can also be said to be the upper edge of the recess 16.

[0067] It can be understood that the wall portion 10 is concave when viewed from the side having the concave portion 16 , and is convex when viewed from the opposite side. When the wall portion 10 is molded with the concave mold 2 , the surface of the convex side faces the concave mold 2 .

[0068] These surfaces include a cavity convex surface 11, a cutting surface 12 and a vertical surface 13 in order from the center to the periphery. The cavity convex surface 11 is used to form a cavity 3 with the die 2, and its shape is set according to the shape of the concave surface of the contact lens to be formed. The cutting surface 12 is relatively straight, and its shape is set according to the shape of the edge portion of the concave surface of the contact lens to be formed. The cutting surface 12 abuts against the cutting portion 22 of the die 2 described later, and is used to shape the edge and ridgeline of the contact lens, and to disconnect the contact lens dry sheet and the residual material. The vertical surface 13 is used to form the residual material channel 4 (a part of it).

[0069] like Figure 3 , Figure 4 As shown, one or more (in the figure, multiple) notches 15 are provided on the outer peripheral surface 14d of the wall portion 14. The notches 15 are open toward the outer peripheral side and recessed toward the inner peripheral side, and are located at the center line X1 (see Figure 2) direction. These notches 15 provide a channel for the discharge of gas during the pressing process of the male mold 1 and the female mold 2, which is helpful to reduce the probability of "bubbles" in the lens. At the same time, they also serve as a channel for the discharge of excess contact lens raw material liquid. In addition, the number of notches 15 can be freely set, for example, 12-24 are set along the circumference of the male mold 1.

[0070] In this embodiment, along the center line X1 direction (the vertical direction in the mold-closed state), the notch 15 includes a straight section 15a and expanded diameter sections 15b and 15c located on both sides thereof. The straight section 15a is composed of a vertical surface extending along the center line X1 direction, and the expanded diameter sections 15b and 15c are composed of inclined surfaces extending in the direction of the center line X1. Among them, the expanded diameter section 15c is located on the side of the surface 14b (the upper surface in the mold-closed state) of the wall section 14 of the straight section 15a where the recess 16 is formed; the expanded diameter section 15b is located on the opposite side, that is, the side of the surface 14a (the lower surface in the mold-closed state) of the wall section 14 where the protrusion is formed of the straight section 15a, and is open on the surface 14a.

[0071] Through the expanded diameter portion 15c, the notch 15 is directed toward the surface 14b (as described later, this direction is the overflow downstream direction of the residual material, see Figure 8 ) is expanded (expanded), and the notch 15 is directed toward the surface 14a (as described later, this direction is the overflow upstream direction of the residual material, see Figure 8 )Expand the diameter (expand the mouth).

[0072] Next, the detailed structure of the die 2 will be described.

[0073] Figure 5 is a cross-sectional view of the die 2; Figure 6 It is a three-dimensional view of the die 2.

[0074] like Figure 5 , Figure 6 As shown, the die 2 is generally bowl-shaped, in the shape of a body of revolution with the center line X2 as the center, and from one side ( Figure 5 The upper side (also the upper side in the mold closing state) has a receiving cavity S1 formed by a concave portion, and the other side ( Figure 5 The lower middle side (also the lower side in the mold closing state) has a raised portion 20.

[0075] The accommodating cavity S1 is used to accommodate the punch 1, and the shape of its inner surface matches the shape of the punch 1. Specifically, the inner surface includes a cavity concave surface 21, a horizontal surface 23, a transition surface 231, a vertical surface 24, a horizontal surface 25, a vertical surface 27 and a slope 28 from the center line X2 to the outer peripheral side.

[0076] The cavity concave surface 21 is used to form a cavity together with the cavity convex surface 11, and its shape is set according to the convex surface of the contact lens to be formed, and can be designed as a spherical surface or an aspherical surface according to the situation.

[0077] The horizontal plane 23 extends perpendicular to the center line X2, and has a ridge portion between it and the concave surface 21 of the cavity, and a relatively sharp cutting portion 22 is formed by the ridge portion. The cutting portion 22 abuts against the cutting surface 12 of the punch 1, and is used to shape the edge and ridge of the contact lens, and to disconnect the dry contact lens and the residual material.

[0078] The vertical surface 24 extends approximately parallel to or slightly inclined to the center line X2, and a transition surface 231 is connected between the vertical surface 24 and the horizontal surface 23. The transition surface 231 extends inclined to the center line X2 and is used for shape transition between the horizontal surface 23 and the vertical surface 24. The transition surface 231 and the vertical surface 24 are radially opposite to a part of the cutting surface 12 of the punch 1 and the vertical surface 13 with a gap therebetween, thereby forming a channel portion 41 (see Figure 8 ), the channel portion 41 is a part of the exhaust channel for gas and excess raw material liquid.

[0079] The horizontal plane 25 extends perpendicularly to the center line X2 and faces the surface 14a of the wall portion 14 of the punch 1 with a gap therebetween, thereby forming a channel portion 42 (see Figure 8 ), the channel portion 42 is connected to the above-mentioned channel portion 41 and is a part of the discharge channel for gas and excess raw material liquid.

[0080] The vertical surface 27 (inner circumference) extends parallel to the center line X2, and is in close contact with the outer circumference 14d of the wall portion 14 of the punch 1 through an interference fit. For example, the interference fit is set to 0 to 0.02 mm. Such a fit ensures that the punch 1 and the die 2 have a reasonable degree of tightness after being pressed together, which not only ensures that the punch 1 and the die 2 can maintain a stable pressed state after being pressed together, but also ensures that the punch 1 and the die 2 are easier to open when separated to take out the lens.

[0081] In addition, the vertical surface 27 and the notch 15 constitute a channel portion 43. Here, the channel portion 41, the channel portion 42, and the channel portion 43 together constitute the residual material channel 4.

[0082] Also, see Figure 5 A step portion 26 is formed at the corner between the outer peripheral edge of the horizontal surface 25 and the vertical surface 27. The step portion 26 constitutes a protrusion protruding from the horizontal surface 25, and its top surface abuts against the surface 14a (lower surface) of the wall portion 14 of the punch 1, supporting the surface 14a, thereby limiting the downward distance of the punch 1, ensuring the accurate relative position relationship between the punch 1 and the die 2 after pressing. In this embodiment, the top surface of the step portion 26 and the outer peripheral edge 14c ( Figure 3 ) abutment.

[0083] In the present embodiment, the step portion 26 is in the shape of a ring that continuously extends in the circumferential direction of the die 2 and is centered on the center line X2.

[0084] In addition, the inclined surface 28 extends obliquely to the center line X2, so that the die 2 expands upward (expands) at this point. The angle between the inclined surface 28 and the center line X2 can be set to 30° to 50°, for example, so that it can play a good guiding role when the male die 1 and the female die 2 are pressed together.

[0085] In addition, if Figure 5 As shown, the die 2 further has a horizontal upper surface 29 , and the accommodating cavity S1 is recessed from the upper surface 29 .

[0086] The following describes a production process for manufacturing contact lenses using the male mold 1 and the female mold 2 described above.

[0087] Figure 7 It is a schematic diagram for illustrating the process of manufacturing contact lenses using the above-mentioned concave mold and convex mold; Figure 8 It is another schematic diagram used to illustrate the process of manufacturing contact lenses using the above-mentioned concave mold and convex mold. Fig. 9 yes Figure 8 Enlarged view of point A in the middle.

[0088] like Figure 7 As shown, first, the contact lens raw material liquid W1 is filled into the bottom of the accommodating cavity S1 of the die 2, and then, after the punch 1 is sucked by the suction device (not shown) of the lens making equipment, the punch 1 is moved above the die 2 and pressed (molded) with the die 2 in a state where the center line X1 and the center line X2 are aligned.

[0089] The assembly state of the male die 1 and the female die 2 after pressing is as follows Figure 8 As shown, a cavity 3 is formed between the male mold 1 and the female mold 2. The raw material liquid in the cavity 3 is cured by heat or light to obtain a dry contact lens W2, and is hydrated to obtain a wet contact lens.

[0090] In addition, the outer peripheral surface 14d of the punch 1 (see Figure 3 , Figure 4 ) and the vertical surface 27 (inner circumference, see Figure 5 ) are interference fit at the joint, the surface 14a (lower surface) of the wall portion 14 of the punch 1 abuts against the step portion 26, the cutting surface 12 of the punch 1 abuts against the cutting portion 22 of the die 2, and the channel 41 and the channel portion 42 are formed between the punch 1 and the die 2 as described above. Figure 8 As indicated by the small and medium arrows, the gas and the excess contact lens stock solution are discharged to the outside through the channel 41 , the channel portion 42 , and the channel portion 43 formed by the notch 15 and the vertical surface 27 of the die 2 .

[0091] With the above structure, the raw material liquid overflows through the notch 15 and solidifies in the notch 15. The solidified residual material here engages with the notch 15, so that the residual material can be easily retained on the punch.

[0092] like Fig. 9 As shown in the partial enlarged view of the edges of the punch 1 and the die 2, the notch 15 has an enlarged diameter portion 15b, so that the interior of the notch 15 is reliably connected with the channel portion 42 to avoid obstruction of the passage.

[0093] In addition, since the notch 15 has the expanded diameter portion 15c, the excess contact lens concentrate forms an undercut structure after solidification at this position, thereby ensuring the reliable formation of the undercut structure, so that the solidified residual material can be more reliably retained on one side of the male mold 1 when the male mold 1 and the female mold 2 are separated to take out the lens. The female mold 2 can ensure that the lens remains reliably on one side of the female mold through surface treatment and other methods, thereby avoiding the residual material and the dry contact lens film being retained on the same side when the male mold and the female mold are separated to take out the lens, thereby improving the film retrieval rate.

[0094] To be more specific, if there is no enlarged diameter portion 15c, the raw material liquid needs to overflow to the upper side of the surface 14b (upper surface) of the wall portion 14 to form the undercut structure. However, in the present embodiment, by providing the enlarged diameter portion 15c, the raw material liquid only needs to overflow to the upper side of the straight section 15a to form the undercut structure, so that the undercut structure can be formed with less raw material liquid, that is, the undercut structure can be formed even when the overflowed raw material liquid is less, so that the excess material can be reliably left on one side of the punch 1.

[0095] As another embodiment, the straight section 15a may be omitted, and this structure may also form an inverted structure.

[0096] In addition, with this embodiment, since the outer circumferential surface 14d of the punch 1 and the vertical surface 27 (inner circumferential surface) of the die 2 are upright surfaces and have an interference fit at the joint, it is beneficial to ensure that the punch 1 and the die 2 are centrally aligned during the pressing process, and the bonding force can be maintained unchanged after the pressing force is removed, which is more conducive to maintaining the state after pressing than technical solutions with structures such as clearance fit and tapered fit.

[0097] In addition, according to the present embodiment, after the male mold 1 and the female mold 2 are pressed together, the surface 14a (lower surface) of the wall portion 14 of the male mold 1 abuts against the step portion 26 of the female mold 2, which plays a role in limiting the downward distance of the male mold 1, thereby ensuring the accurate relative position relationship after the male mold 1 and the female mold 2 are pressed together. This ensures that the cutting surface 12 of the male mold 1 and the cutting portion 22 of the female mold 2 are in a stable and consistent abutment state, thereby reducing edge defects caused by the unstable and inconsistent pressing state of the male mold 1 and the female mold 2, and improving the production yield of contact lenses.

[0098] In summary, the technical solution of the male mold 1 and the female mold 2 proposed in this embodiment can be used to stably, efficiently and in large quantities to manufacture contact lenses.

[0099] In the above-mentioned embodiment, the diameter-enlarged portion is formed by an inclined surface. However, as another embodiment, the diameter-enlarged portion may be formed by a stepped surface.

[0100] Some modified examples of the present utility model are described below.

[0101] Fig.10 is a stereoscopic view of the punch involved in Modification 1; Fig.11 This is another perspective view of the punch according to Modification 1.

[0102] The main difference between this modification and the above-mentioned embodiment is that, in the above-mentioned embodiment, an overflow groove for discharging the raw material liquid is formed on the wall portion 14 by means of a notch 15, while in this modification, a plurality of through holes 17 are formed on the wall portion 14 to form an overflow groove. The other structures are the same as those in the above-mentioned embodiment, and the same reference numerals are used, and their description is omitted.

[0103] In this variation, the through hole 17 can be in the form of a straight hole, a tapered hole, a threaded hole, a stepped hole, an inclined hole, etc., and its shape can be a round hole or a hole of other shapes. In addition, similar to the above embodiment, the through hole 17 can include a straight section and two enlarged diameter sections located on both sides thereof.

[0104] In contrast, with this modified example, when the punch 1 and the die 2 are pressed together, from the time when the distance between the two is relatively far to the time when they are completely pressed together, there may be two channels for the excess raw material liquid to be discharged outwards, one of which is to be discharged through the through hole 17, and the other is to be discharged through the gap between the outer peripheral surface 14d of the wall portion 14 and the die 2. Therefore, in order to ensure that the raw material liquid can be reliably discharged through the through hole 17, it is best to make the through hole 17 have a larger inner diameter. The specific numerical value can be set by those skilled in the art according to the situation. With the above-mentioned embodiment, since the notch 15 (groove) is provided on the outer peripheral surface 14d of the wall portion 14, the only channel for the raw material liquid to be discharged outwards through the wall portion 14 is the outer peripheral surface 14d, so it can be reliably ensured that the raw material liquid overflows from the notch 15, thereby reliably ensuring that the residual material remains on the punch 1.

[0105] Fig.12 is a cross-sectional view of the punch involved in Modification Example 2; Fig.13 This is a perspective view of the punch according to Modification 2.

[0106] The main difference between this modification and the above-mentioned embodiment is that a protrusion 18 is formed on the surface 14b of the wall portion 14. The other structures are the same as those of the above-mentioned embodiment, and the same figure marks are used, and their descriptions are omitted.

[0107] like Fig.12 , Fig.13 As shown, the protrusion 18 is in the shape of a ring with the center line X1 as the center, and the recess 16 is located on the inner circumference of the protrusion 18. During the manufacturing process of the contact lens, the pressing head (not shown) of the lens manufacturing equipment extends into the recess 16 for pressing, so that the male mold 1 and the female mold 2 are assembled. Due to the protrusion 18, the protrusion 18 has an isolation effect on the flow of the raw material liquid, preventing the discharged contact lens raw material liquid from contacting the pressing head, causing contamination or adhesion to the pressing head, affecting the pressing accuracy, and further affecting the contact lens production yield.

[0108] Fig.14 is a cross-sectional view of the punch involved in Modification Example 3; Fig.15 This is a perspective view of the punch according to Modification 3.

[0109] The main difference between this variant 3 and the above-mentioned variant 2 is that in this variant 3, the notch 15 is replaced by a through hole 17, and the other structures are the same, the same figure marks are used, and their descriptions are omitted.

[0110] Fig.16 is a cross-sectional view of the punch involved in Modification Example 4; Fig.17 This is a perspective view of a punch according to Modification 4.

[0111] The main difference between this variation and the above-mentioned variation 2 is that a recess 19 (pit) is formed on the surface 14a of the wall portion 14, and the recess 19 is connected to the notch 15 (expanded diameter portion 15c), so as to accommodate the raw material liquid overflowing from the notch 15 (expanded diameter portion 15c), so that the residual material after solidification can be more reliably retained on the side of the punch 1, thereby increasing the stability of the residual material remaining on the side of the punch 1.

[0112] Fig.18 It is a cross-sectional view of the contact lens mold involved in Modification Example 5.

[0113] The main difference between this modification and the above embodiment is that, in the above embodiment, a step portion 26 is designed at the corner of the edge of the die 2. After the male die 1 and the female die 2 are pressed together, the upper surface (top surface) of the step portion 26 abuts against the surface 14a (lower surface) of the wall portion 14 of the male die 1, which plays a role in limiting the downward distance of the male die, thereby ensuring the accurate relative position relationship between the male die and the female die after pressing together. In this modification 5, the step portion 26 is omitted, and the above purpose can also be achieved by accurately controlling the downward pressing distance of the mirror making device. In this modification, since the connection can be reliably achieved, the enlarged diameter portion 15b on the lower side of the notch 15 can also be omitted.

[0114] Fig.19 This is a perspective view of a concave mold according to Modification Example 6.

[0115] The main difference between this modification example 6 and the above-mentioned embodiment is that in the above-mentioned embodiment, as a form of protrusion, a step portion 26 extending continuously around the entire circumference is formed, however, in this modification example, Fig.19 As shown, a plurality of step portions 26A are provided along the circumference of the die 2, and the plurality of step portions 26A are arranged at intervals along the circumference of the die 2 to support the outer peripheral edge 14c ( Figure 3 ).

[0116] In addition, as other embodiments, other forms of protrusions are not limited to the form of step portions. For example, independent protrusions, such as cylindrical protrusions, may be provided at other positions of the horizontal surface 25 other than the outer peripheral edge.

[0117] In the above description, the example of leaving the residual material on the male mold is used for explanation. However, as another embodiment, the residual material may be left on the female mold and the contact lens dry piece may be left on the male mold.

[0118] Fig. 20 is a cross-sectional view of a contact lens mold provided in this specification; Fig.21 It is a stereoscopic view of the male mold of the contact lens mold.

[0119] Fig. 20 , Fig.21 The main difference between the structure shown and the above embodiment is that the notch 15 (or through hole 17) on the wall 14 of the male mold 1 is omitted, and the residual material channel 4 is formed only by the gap between the inner periphery of the male mold 1 and the outer periphery of the female mold 2. At this time, the purpose of exhausting gas and accommodating overflow can be achieved by controlling the pressing speed of the lens making equipment and the injection amount of the contact lens raw material liquid in the female mold, and utilizing the gap between the inner periphery of the male mold 1 and the outer periphery of the female mold 2. It can be understood that the above embodiment is different from the above embodiment. Fig. 20 , Fig.21 Compared with the method, it has technical effects such as adaptability to a wider range of control accuracy.

[0120] Unless otherwise defined, all technical and scientific terms used in this application are the same as those generally understood by those skilled in the art to which this application belongs. If there is any inconsistency, the meaning described in the full text of this application or the meaning derived from the content recorded in the full text of this application shall prevail. In addition, the terms used in this description are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0121] It can be understood that those skilled in the art can combine the features mentioned in one or more embodiments mentioned in the entire application with the features in other embodiments in any appropriate manner to implement the application.

[0122] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the technical concept of the present application, all of which belong to the protection scope of the present application.

Claims

1. A corneal contact lens mold, comprising a concave mold and a convex mold, wherein the concave mold and the convex mold are combined to form a mold cavity, characterized in that: One or more overflow grooves are formed on the first wall of one of the concave mold or the convex mold, and the overflow grooves penetrate the first wall to allow the raw material liquid discharged from the mold cavity to overflow. The overflow groove includes a first diameter expansion portion, and the overflow groove is expanded in diameter toward an overflow downstream direction by the first diameter expansion portion.

2. The contact lens mold according to claim 1, characterized in that: The first diameter-enlarged portion includes an inclined surface or a stepped surface.

3. The contact lens mold according to claim 1, characterized in that: The overflow groove includes a notch that is disposed on a first outer peripheral surface of the first wall portion and opens toward the outer peripheral side.

4. The contact lens mold according to claim 3, characterized in that: The concave mold includes a first inner peripheral surface opposite to the first outer peripheral surface.

5. The contact lens mold according to claim 4, characterized in that: The first outer peripheral surface is in close contact with the first inner peripheral surface.

6. The contact lens mold according to claim 1, characterized in that: The overflow tank includes a through hole.

7. The contact lens mold according to any one of claims 1 to 6, characterized in that: The overflow groove includes a second diameter-enlarged portion located on the overflow upstream side of the first diameter-enlarged portion, and the overflow groove is expanded toward the overflow upstream side by the second diameter-enlarged portion.

8. The contact lens mold according to claim 7, characterized in that: The second enlarged diameter portion includes an inclined surface.

9. The contact lens mold according to any one of claims 1 to 6, characterized in that: The overflow groove includes a straight section, and the straight section is located on the overflow upstream side of the first expanded diameter portion.

10. The contact lens mold according to any one of claims 1 to 6, characterized in that: A second recessed portion communicating with the overflow groove is provided on the first wall portion.

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