Contact lens mold

Abstract

The utility model relates to a contact lens mold. The contact lens mold comprises a first mold and a second mold, the first mold is provided with an arc-shaped convex part, a first abutting part and a second abutting part, and the second mold is provided with an arc-shaped concave part and a second assembling part. When the first die and the second die are matched with each other, a forming space is formed between the arc-shaped convex part and the arc-shaped concave part, the first abutting part and one side of the second assembling part extrude each other so that the first die and the second die can be stably combined, and the second abutting part abuts against the other side of the second assembling part so that the second assembling part can be limited to deform in the radial direction. The contact lens mold has the advantages and effects of preventing the mold from deforming, ensuring the manufacturing precision of contact lenses, improving the process yield and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a contact lens mold, specifically to a structure capable of effectively preventing the deformation of the mold. BACKGROUND

[0002] In the current contact lens forming mold, the combination positioning is usually achieved by the mutual clamping of the upper mold and the lower mold, and then the forming space of the contact lens is formed between the upper mold and the lower mold. For example, Taiwan Patent No. M504695 proposes a contact lens former, which gradually extrudes the concave body of the lower mold through the inclined surface of the convex strip of the upper mold, and then forms the stable combination of the upper and lower molds.

[0003] However, under the extrusion of the upper mold, the lower mold may be deformed outward, causing unpredictable deformation of the lens forming space between the upper and lower molds, directly affecting the geometric accuracy of the forming space, and then causing the size and shape accuracy of the lens product to deviate, reducing the stability of the lens process.

[0004] Therefore, how to prevent the deformation of the mold after combination is one of the problems to be solved by those skilled in the art. UTILITY MODEL CONTENT

[0005] In order to overcome the above-mentioned shortcomings, the utility model provides a contact lens mold, which is combined with the second assembly part of the second mold through the second abutting part of the first mold, and then limits the radial deformation of the second assembly part, so as to solve the multiple shortcomings of the prior art.

[0006] The utility model discloses a contact lens mold, which comprises a first mold and a second mold; the first mold has an arc convex part and a first assembly part extending along an axial direction; the first assembly part has a first abutting part, a second abutting part and a first assembly groove; the first abutting part and the second abutting part are arranged along a radial direction; the first assembly groove is arranged between the first abutting part and the second abutting part; the second mold is matched with the first mold, and has an arc concave part and a second assembly part extending along the axial direction; when the first mold and the second mold are matched, a forming space is formed between the arc convex part and the arc concave part; the second assembly part is inserted into the first assembly groove; the first abutting part and one side of the second assembly part are extruded to stably combine the first mold and the second mold; and the second abutting part abuts against the other side of the second assembly part to limit the radial deformation of the second assembly part.

[0007] In some embodiments, the first assembly part surrounds the arc convex part, and the second assembly part surrounds the assembly concave part.

[0008] In some embodiments, the second abutting portion is arranged outside the first abutting portion, and a first assembly groove is formed around the first abutting portion and the second abutting portion.

[0009] In some embodiments, when the first mold and the second mold are matched with each other, the second assembly portion and the first abutting portion are in close contact, and the second abutting portion and the second assembly portion are in sliding contact.

[0010] In some embodiments, a small gap is formed between the second abutting portion and the second assembly portion, and the small gap is 0.01 mm to 0.03 mm.

[0011] In some embodiments, the second mold further has a limiting structure, and when the first mold and the second mold are matched with each other, the second abutting portion is located between the second assembly portion and the limiting structure.

[0012] In some embodiments, the limiting structure has an extension section and a limiting section connected to each other, one end of the extension section is connected to the second assembly portion, the other end of the extension section extends away from the second assembly portion along the radial direction and is connected to the limiting section, and the limiting section extends away from the extension section along the axial direction, so that a second assembly groove is formed between the second assembly portion, the extension section and the limiting section; when the first mold and the second mold are matched with each other, the second abutting portion is inserted into the second assembly groove, and the limiting section abuts against the second abutting portion to limit the deformation of the second abutting portion along the radial direction.

[0013] In some embodiments, the first abutting portion further has a plurality of protrusions, and each protrusion is arranged on a side of the first abutting portion facing the first assembly groove, and each protrusion is arranged in a spaced manner; when the first mold and the second mold are matched with each other, each protrusion is pressed against one side of the second assembly portion.

[0014] The following will be described in detail with specific embodiments and with the aid of drawings, so that the technical features of the present application can be further understood by the examiners. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is an exploded schematic view of the contact lens mold of the present application.

[0016] Fig. 2 It is an exploded schematic view of the contact lens mold of the present application from another perspective.

[0017] Fig. 3 It is a cross-sectional exploded view of the contact lens mold of the present application.

[0018] Fig. 4 It is a cross-sectional view of the contact lens mold of the present application.

[0019] Symbol explanation:

[0020] 10, first mold

[0021] 11, arc-shaped protrusion

[0022] 12, first assembly part

[0023] 121, first abutting part

[0024] 1211, protruding block

[0025] 122, second abutting part

[0026] 123, first assembly groove

[0027] 20, second mold

[0028] 21, arc-shaped recess

[0029] 22, second assembly part

[0030] 23, limiting structure

[0031] 231, extension section

[0032] 232, limiting section

[0033] 233, second assembly groove

[0034] S, molding space

[0035] D1, axial direction

[0036] D2, radial direction DETAILED DESCRIPTION

[0037] Please refer to Figs. 1 to 4 , the utility model discloses a contact lens mold for making contact lens, which comprises a first mold 10 and a second mold 20.

[0038] The first mold 10 has an arc-shaped protrusion 11 and a first assembly part 12 extending along an axial direction D1. The arc-shaped protrusion 11 protrudes from one end of the first mold 10, and the first assembly part 12 has a first abutting part 121, a second abutting part 122 and a first assembly groove 123. The first abutting part 121 and the second abutting part 122 are arranged at intervals along a radial direction D2, and the first assembly groove 123 is arranged between the first abutting part 121 and the second abutting part 122.

[0039] The second mold 20 is used to cooperate with the first mold 10, and has an arc-shaped recess 21 and a second assembly part 22 extending along the axial direction D1.

[0040] When the first mold 10 and the second mold 20 are matched with each other along the axial direction D1, the arc-shaped convex part 11 of the first mold 10 faces the arc-shaped concave part 21 of the second mold 20, so that a molding space S is formed between the arc-shaped convex part 11 and the arc-shaped concave part 21, and the second assembly part 22 of the second mold 20 is inserted into the first assembly groove 123 of the first mold 10. Wherein, the first abutting part 121 of the first assembly part 12 is pressed against one side of the second assembly part 22, and the second abutting part 122 abuts against the other side of the second assembly part 22. Therefore, the first mold 10 and the second mold 20 are stably combined by the radial pressing of the first abutting part 121 and the second assembly part 22, the axial D1 sliding is effectively avoided, and the deformation of the second assembly part 22 along the radial direction D2 is limited by the second abutting part 122.

[0041] Wherein, the molding space S formed by the arc-shaped convex part 11 of the first mold 10 and the arc-shaped concave part 21 of the second mold 20 can be used to manufacture contact lenses. For example, the polymer material is injected into the bottom surface of the arc-shaped concave part 21 of the second mold 20, and then the first mold 10 and the second mold 20 are matched with each other, so that the arc-shaped convex part 11 is placed into the arc-shaped concave part 21 of the second mold 20. The polymer material is pressed between the top surface of the arc-shaped convex part 11 and the bottom surface of the arc-shaped concave part 21, and after the polymer material is solidified by heating, the contact lens is formed.

[0042] In the structural design, the first assembly part 12 of the first mold 10 and the second assembly part 22 of the second mold 20 are annular structures, and the first assembly part 12 surrounds the arc-shaped convex part 11, and the second assembly part 22 surrounds the arc-shaped concave part 21. Wherein, the second abutting part 122 of the first assembly part 12 surrounds the first abutting part 121, so that the first assembly groove 123 is formed around the first abutting part 121 and the second abutting part 122.

[0043] More specifically, in order to stably combine the first mold 10 and the second mold 20 and avoid the deformation of the structure affecting the manufacturing of the contact lens, in the structural size, the inner diameter of the second assembly part 22 is slightly smaller than the outer diameter of the first abutting part 121, and the inner diameter of the second abutting part 122 is slightly larger than the outer diameter of the second assembly part 22.

[0044] It can be understood that, through the above size design, after the first mold 10 and the second mold 20 are matched with each other, the second assembly part 22 and the first abutting part 121 of the first assembly part 12 are in a close fit state, and a slight resistance is generated in the axial direction D1, thereby avoiding the mutual sliding of the first mold 10 and the second mold 20 in the axial direction. The second abutting part 122 and the second assembly part 22 are in a sliding fit, so that the second abutting part 122 can limit the deformation of the second assembly part 22 in the radial direction D2 without affecting the fit of the first mold 10 and the second mold 20. For example, the inner diameter of the second abutting part 122 is 0.01 mm larger than the outer diameter of the second assembly part 22, and there is a slight gap between the second abutting part 122 and the second assembly part 22, and the slight gap is 0.01 mm to 0.03 mm.

[0045] The first abutting part 121 of the first assembly part 12 further has a plurality of protrusions 1211. The protrusions 1211 are arranged at intervals on the side of the first abutting part 121 facing the first assembly groove 123 (that is, on the outer side surface of the first abutting part 121), so that when the first mold 10 and the second mold 20 are matched with each other, the protrusions 1211 are pressed against one side of the second assembly part 22 (that is, abut against the inner side surface of the second assembly part 22), thereby achieving the close fit of the first abutting part 121 and the second assembly part 22.

[0046] In addition, in order to further improve the structural strength and avoid deformation of the first mold 10 and the second mold 20 after being matched with each other, in some embodiments, the second mold 20 further has a limiting structure 23. The limiting structure 23 surrounds the second assembly part 22, and when the first mold 10 and the second mold 20 are matched, the second abutting part 122 of the first assembly part 12 is located between the second assembly part 22 and the limiting structure 23, further limiting the deformation of the second abutting part 122 in the radial direction D2.

[0047] In more detail, the limiting structure 23 of the second mold 20 has a connecting extension 231 and a limiting segment 232. One end of the extension 231 is connected to the outer side surface of the second assembly part 22, the other end extends in the radial direction D2 away from the second assembly part 22, and is connected to the limiting segment 232. The limiting segment 232 extends in the axial direction D1 away from the extension 231, so that the second assembly part 22, the extension 231 and the limiting segment 232 form a second assembly groove 233. Therefore, when the first mold 10 and the second mold 20 are matched with each other, the second abutting part 122 of the first assembly part 12 is inserted into the second assembly groove 233, so that the limiting segment 232 of the limiting structure 23 abuts against the outer side of the second abutting part 122 to limit the deformation of the second abutting part 122 in the radial direction D2.

[0048] But the utility model is not limited to this, in practice, the position of the first assembling part 12 of the first mold 10 and the second assembling part 22 and the limiting structure 23 of the second mold 20 can also be interchanged. For example, the first assembling part 12 is arranged on the second mold 20, and the second assembling part 22 and the limiting structure 23 are arranged on the first mold 10, and the effect of mutual cooperation and deformation limitation can also be achieved.

[0049] From the above description, the contact lens mold of the utility model achieves stable combination by the first abutting part of the first mold abutting inside the second assembling part of the second mold, and limits the deformation of the second assembling part along the radial direction by the second abutting part abutting outside the second assembling part, which effectively solves the deformation problem of the prior art after mold combination. In addition, the utility model can further limit the deformation of the second abutting part along the radial direction through the limiting structure, so that the first mold and the second mold are combined, and the double limitation of the second abutting part and the limiting structure further improves the anti-deformation effect, ensures the precision of the contact lens in the manufacturing process, and improves the process yield.

Claims

1. A contact lens mold characterized by, It comprises: a first mold having an arc-shaped protrusion extending along an axial direction and a first assembly portion, the first assembly portion having a first abutting portion, a second abutting portion and a first assembly slot, wherein the first abutting portion and the second abutting portion are arranged along a radial direction, and the first assembly slot is arranged between the first abutting portion and the second abutting portion; and a second mold for cooperating with the first mold, and having an arc-shaped recess extending along the axial direction and a second assembly portion; when the first mold and the second mold are cooperated, a forming space is formed between the arc-shaped protrusion and the arc-shaped recess, the second assembly portion is inserted into the first assembly slot, the first abutting portion and one side of the second assembly portion are pressed against each other to stably combine the first mold and the second mold, and the second abutting portion abuts against the other side of the second assembly portion to limit the deformation of the second assembly portion along the radial direction.

2. The contact lens mold of claim 1, wherein, The first assembly portion surrounds the arc-shaped protrusion, and the second assembly portion surrounds the arc-shaped recess.

3. The contact lens mold of claim 2, wherein, The second abutting portion surrounds the first abutting portion, and the first abutting portion and the second abutting portion surround the first assembly slot.

4. The contact lens mold of claim 3, wherein, When the first mold and the second mold are cooperated, the second assembly portion and the first abutting portion are in close fit, and the second abutting portion and the second assembly portion are in sliding fit.

5. The contact lens mold of claim 4, wherein, The second abutting portion and the second assembly portion have a small gap therebetween, and the small gap is 0.01mm to 0.03mm.

6. The contact lens mold of claim 4, wherein, The second mold further has a limiting structure, and when the first mold and the second mold are cooperated, the second abutting portion is located between the second assembly portion and the limiting structure.

7. The contact lens mold of claim 6, wherein, The limiting structure has a connecting extension and a limiting section, one end of the connecting extension is connected to the second assembly portion, the other end extends away from the second assembly portion along the radial direction and is connected to the limiting section, and the limiting section extends away from the connecting extension along the axial direction, so that the second assembly portion, the connecting extension and the limiting section form a second assembly slot; when the first mold and the second mold are cooperated, the second abutting portion is inserted into the second assembly slot, and the limiting section abuts against the second abutting portion to limit the deformation of the second abutting portion along the radial direction.

8. The contact lens mold of claim 4, wherein, The first abutting portion further has a plurality of protrusions, and each protrusion is arranged on the side of the first abutting portion facing the first assembly slot, and when the first mold and the second mold are cooperated, each protrusion and one side of the second assembly portion are pressed against each other.

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