Combined mold for preparing multi-layer composite contact lenses

Abstract

The utility model discloses a combined die for preparing a multi-layer composite contact lens, comprising: a first combined die comprising a first upper die and a first lower die, after the first upper die and the first lower die are combined, a first molding cavity for molding and curing a first lens layer is formed in the first upper die and the first lower die; the second closing mold comprises a second upper mold and a second lower mold, and a second forming cavity used for forming and curing a second lens layer is formed in the second upper mold and the second lower mold after the second upper mold and the second lower mold are closed; and the first upper die and the second lower die are matched with each other and are closed to form a third forming cavity for compounding the first lens layer and the second lens layer. The problems that multiple sets of different molds need to be replaced for preparation, and much inconvenience exists are solved.

Description

Technical Field

[0001] The present application relates to a forming mold for contact lenses, and more particularly to a combined mold for preparing multi-layer composite contact lenses. Background Art

[0002] Currently, the manufacturing methods of contact lenses on the market are mainly divided into three categories: turning method, spinning method and casting method. Among them, the casting method is to inject the contact lens material into the lower mold, then cover the upper mold and press it to polymerize and solidify into the mold shape. After separating the mold and taking out the lens, soak it in warm water to soften it, and then the manufacturing of the contact lens is completed. When using the casting method to produce a composite contact lens with a multi-layer structure, multiple sets of different molds need to be replaced for preparation, which is rather inconvenient. Utility Model Content

[0003] The present utility model discloses a combined mold for preparing multi-layer composite contact lenses, which solves the problem of inconvenience caused by the need to replace multiple sets of different molds for preparation.

[0004] A combined mold for preparing multi-layer composite contact lenses, comprising:

[0005] The first mold assembly, including a first upper mold and a first lower mold. After the first upper mold and the first lower mold are closed, a first forming cavity for forming and curing the first lens layer is formed inside.

[0006] The second mold assembly, including a second upper mold and a second lower mold. After the second upper mold and the second lower mold are closed, a second forming cavity for forming and curing the second lens layer is formed inside.

[0007] The first upper mold and the second lower mold are mutually adapted and closed to form a third forming cavity for laminating the first lens layer and the second lens layer.

[0008] In the present application, the first mold assembly and the second mold assembly are provided to respectively form the first lens layer and the second lens layer, and then the first upper mold and the second lower mold are used in combination to cooperate to form a third forming cavity for laminating the first lens layer and the second lens layer. The cross-combination usage mode of the first mold assembly and the second mold assembly in the present application reduces the number of molds required for preparing multi-layer composite contact lenses.

[0009] The following also provides several optional ways, which are not additional limitations to the above overall solution, but are only further supplements or optimizations. Without technical or logical contradictions, each optional way can be combined with the above overall solution alone, or multiple optional ways can be combined with each other.

[0010] Optionally, one side of the first upper mold has a cylindrical first insertion portion, and a first spherical protrusion is provided at the end of the first insertion portion; one side of the first lower mold has a first circular channel adapted to the first insertion portion, and a first spherical depression is provided at the bottom of the first circular channel; the first spherical protrusion and the first spherical depression cooperate to form the first molding cavity.

[0011] Optionally, a first annular step surface is provided on the outer periphery of the first spherical protrusion, and a second annular step surface is provided on the outer periphery of the first spherical depression. The first annular step surface abuts against the second annular step surface for sealing the first molding cavity.

[0012] Optionally, one side of the second upper mold has a cylindrical second insertion portion, and a second spherical protrusion is provided at the end of the second insertion portion; one side of the second lower mold has a second circular channel adapted to the second insertion portion, and a second spherical depression is provided at the bottom of the second circular channel; the second spherical protrusion and the second spherical depression cooperate to form the second molding cavity.

[0013] Optionally, a third annular step surface is provided on the outer periphery of the second spherical protrusion, and a fourth annular step surface is provided on the outer periphery of the second spherical depression. The third annular step surface abuts against the fourth annular step surface for sealing the second molding cavity.

[0014] Optionally, the arc surface radii where the first spherical protrusion, the first spherical depression, the second spherical protrusion, and the second spherical depression are located decrease in sequence.

[0015] Optionally, the first lens layer is located on one side of the first spherical protrusion, and the second lens layer is located on one side of the second spherical depression. When the first lens layer and the second lens layer are laminated, a gap is formed between them to provide a liquid injection space.

[0016] The beneficial effects of the present application compared with the prior art are as follows:

[0017] In the present application, the cross-combination use mode of the first mold clamping and the second mold clamping reduces the number of molds required for preparing multi-layer composite contact lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic cross-sectional view of the first mold clamping in the present application;

[0019] Figure 2 It is a schematic cross-sectional view of the second mold clamping in the present application;

[0020] Figure 3 It is a schematic view of the cooperation between the first upper mold and the second lower mold in the present application.

[0021] The descriptions of the reference numerals in the drawings are as follows:

[0022] 1. First mold clamping; 11. First upper mold; 12. First lower mold; 13. First forming cavity; 15. First spherical protrusion; 16. First spherical depression; 17. First annular step surface; 18. Second annular step surface;

[0023] 2. Second mold clamping; 21. Second upper mold; 22. Second lower mold; 23. Second forming cavity; 24. Second spherical protrusion; 25. Second spherical depression; 26. Third annular step surface; 27. Fourth annular step surface;

[0024] 3. Third forming cavity. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0026] It should be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or there may also be an intermediate component. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] Reference Figures 1 to 3 , in an embodiment of the present application, there is disclosed a combined mold for preparing a multilayer composite contact lens, including: a first mold clamping 1 for preparing a first lens layer and a second mold clamping 2 for preparing a second lens layer.

[0029] Among them, the first mold clamping 1 includes a first upper mold 11 and a first lower mold 12, and a first forming cavity 13 for curing the first lens layer is formed by enclosing between the first upper mold 11 and the first lower mold 12. The second mold clamping 2 includes a second upper mold 21 and a second lower mold 22, and a second forming cavity 23 for curing the second lens layer is formed by enclosing between the second upper mold 21 and the second lower mold 22.

[0030] Moreover, the first upper mold 11 and the second lower mold 22 can be used in combination to form a third molding cavity 3 between the first upper mold 11 and the second lower mold 22, which can accommodate the first lens layer and the second lens layer and is used for the lamination and curing of both.

[0031] Reference Figure 1 , on one side of the first upper mold 11, there is a cylindrical first extending portion, and at the end of the first extending portion, there is a first spherical protrusion 15; on one side of the first lower mold 12, there is a first circular channel adapted to the first extending portion 14, and at the bottom of the first circular channel, there is a first spherical depression 16; the first spherical protrusion 15 and the first spherical depression 16 cooperate to form a first molding cavity 13.

[0032] After injecting an appropriate amount of solution into the first spherical depression 16, insert the first extending portion into the first circular channel, so that the first spherical protrusion 15 and the first spherical depression 16 complete the mold closing, and the solution fully fills the first molding cavity 13 and then cures to form the first lens layer.

[0033] Furthermore, a first annular step surface 17 is provided on the outer periphery of the first spherical protrusion 15, and a second annular step surface 18 is provided on the outer periphery of the first spherical depression 16. The first annular step surface 17 and the second annular step surface 18 abut against each other to seal the first molding cavity 13.

[0034] The first annular step surface 17 and the second annular step surface 18 abut against each other, which plays a role in stroke limitation when the first extending portion extends into the first circular channel, ensures the effectiveness of the first molding cavity 13, and makes the thickness of the cured and formed first lens layer consistent.

[0035] Reference Figure 2 , on one side of the second upper mold 21, there is a cylindrical second extending portion, and at the end of the second extending portion, there is a second spherical protrusion 24; on one side of the second lower mold 22, there is a second circular channel adapted to the second extending portion, and at the bottom of the second circular channel, there is a second spherical depression 25; the second spherical protrusion 24 and the second spherical depression 25 cooperate to form a second molding cavity 23.

[0036] Furthermore, to play a limiting role, ensure the effectiveness of the second molding cavity 23, and make the thickness of the cured and formed second lens layer consistent. A third annular step surface 26 is provided on the outer periphery of the second spherical protrusion 24, and a fourth annular step surface 27 is provided on the outer periphery of the second spherical depression 25. The third annular step surface 26 and the fourth annular step surface 27 abut against each other to seal the second molding cavity 23.

[0037] In some embodiments, the above multi-layer composite contact lens can be formed by compounding three lenses. When in use, the outermost layer away from the eyeball is equivalent to the above-mentioned second lens layer, the innermost layer close to the eyeball is equivalent to the above-mentioned first lens layer, and there is an intermediate layer. Among them, the first lens layer and the second lens layer can be hydrophilic layers, and the intermediate layer can be a lens layer.

[0038] The arc surface radii where the first spherical protrusion 15, the first spherical depression 16, the second spherical protrusion 24, and the second spherical depression 25 are located decrease in sequence. Thus, it is ensured that the curvature of the inner surface of the second lens layer is close to the curvature of the surface of the first lens layer.

[0039] Furthermore, the first lens layer is located on one side of the first spherical protrusion 15, and the second lens layer is located on one side of the second spherical depression 25. When the first lens layer and the second lens layer are compounded, a gap is formed between them to provide a liquid injection space.

[0040] It can be understood that after the formation of the first lens layer and the second lens layer is completed, a solution corresponding to the intermediate layer is injected into the inner side of the second lens layer, and the first upper mold 11 with the first lens layer is combined with the second lower mold 22, so that the intermediate layer is formed and cured between the first lens layer and the second lens layer.

[0041] Furthermore, the arc surface of the first spherical protrusion 15 is provided with a first through hole for generating negative pressure when the first mold 1 is separated, so that the first lens layer is separated with the first upper mold 11; the arc surface of the second spherical depression 25 is provided with a second through hole for generating negative pressure when the second mold 2 is separated, so that the second lens layer is separated with the second lower mold 22.

[0042] The technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification. When the technical features in different embodiments are shown in the same drawing, it can be regarded that the drawing also discloses the combined examples of the various embodiments involved at the same time.

[0043] The above-mentioned embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application.

Claims

1. A combined mold for preparing a multi-layer composite contact lens, characterized in that: include: A first mold (1) comprising a first upper mold (11) and a first lower mold (12), wherein the first upper mold (11) and the first lower mold (12) are molded together to form a first molding cavity (13) for molding and curing a first lens layer; A second mold (2) comprising a second upper mold (21) and a second lower mold (22), wherein the second upper mold (21) and the second lower mold (22) are molded together to form a second molding cavity (23) for molding and curing the second lens layer; The first upper mold (11) and the second lower mold (22) are adapted to each other and are combined to form a third molding cavity (3) for compounding the first lens layer and the second lens layer.

2. A combined mold for preparing a multi-layer composite contact lens according to claim 1, characterized in that: One side of the first upper mold (11) has a first cylindrical extension portion, and the end of the first extension portion has a first spherical protrusion (15); one side of the first lower mold (12) has a first circular channel matched with the first extension portion (14), and a first spherical recess (16) is provided at the bottom of the first circular channel; the first spherical protrusion (15) and the first spherical recess (16) cooperate to form the first molding cavity (13).

3. A combined mold for preparing a multi-layer composite contact lens according to claim 2, characterized in that: The outer periphery of the first spherical protrusion (15) is provided with a first annular step surface (17), and the outer periphery of the first spherical recess (16) is provided with a second annular step surface (18); the first annular step surface (17) and the second annular step surface (18) abut against each other to seal the first molding cavity (13).

4. A combined mold for preparing a multi-layer composite contact lens according to claim 3, characterized in that: One side of the second upper mold (21) has a cylindrical second insertion portion, and the end of the second insertion portion has a second spherical protrusion (24); one side of the second lower mold (22) has a second circular channel matched with the second insertion portion, and a second spherical recess (25) is provided at the bottom of the second circular channel; the second spherical protrusion (24) cooperates with the second spherical recess (25) to form the second molding cavity (23).

5. A combined mold for preparing a multi-layer composite contact lens according to claim 4, characterized in that: The outer periphery of the second spherical protrusion (24) is provided with a third annular step surface (26), and the outer periphery of the second spherical recess (25) is provided with a fourth annular step surface (27), and the third annular step surface (26) and the fourth annular step surface (27) abut against each other to seal the second molding cavity (23).

6. A combined mold for preparing a multi-layer composite contact lens according to claim 5, characterized in that: The radii of the arc surfaces where the first spherical protrusion (15), the first spherical depression (16), the second spherical protrusion (24), and the second spherical depression (25) are located decrease in sequence.

7. A combined mold for preparing a multi-layer composite contact lens according to claim 5, characterized in that: The first lens layer is located on one side of the first spherical protrusion (15), and the second lens layer is located on one side of the second spherical depression (25). When the first lens layer and the second lens layer are combined, a gap is formed between the two to provide a liquid injection space.

8. A combined mold for preparing a multi-layer composite contact lens according to claim 7, characterized in that: The first spherical protrusion (15) has a first through hole on its arc surface, which is used to generate negative pressure when the first closing mold (1) is separated, so that the first lens layer is separated from the first upper mold (11); The arc surface of the second spherical recess (25) is provided with a second through hole, which is used to generate negative pressure when the second closing mold (2) is separated, so that the second lens layer is separated from the second lower mold (22).

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