Concave die and convex die structure for manufacturing contact lenses

Abstract

The utility model relates to the technical field of dies, in particular to a female die and male die structure for manufacturing contact lenses. The male die covers the interior of the female die to form a die cavity for manufacturing contact lenses; the female die comprises an annular first boss, a first annular step and a first disc, wherein the first annular step extends downwards on the basis of an inner ring of the first boss, the section of the first annular step is in an L shape, and the first disc extends downwards on the basis of an inner ring of the first annular step. The first disc comprises a conical ring and a female die cavity disc which are sequentially connected from top to bottom, an upper end opening of the conical ring is large, a lower end opening of the conical ring is small, and the inner surface of the female die cavity disc protrudes out of the inner surface of the conical ring. The male die comprises a second annular boss, a second annular step and a second disc, wherein the second annular step extends downwards on the basis of an inner ring of the second boss, the section of the second annular step is in an L shape, and the second disc extends downwards on the basis of an inner ring of the second annular step. The female die and male die structure for manufacturing the contact lenses is simple and ingenious in structure and high in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a concave mold and a convex mold structure for making contact lenses. Background Art

[0002] Contact lenses, also called contact lenses or contact glasses, refer to lenses that are worn on the cornea of ​​the eye to correct vision or protect the eyes. According to the hardness of the material, they include hard, semi-rigid, and soft types. Contact lenses not only bring great improvements in appearance and convenience to patients with refractive errors such as myopia, hyperopia, and astigmatism, but also provide a wide field of vision and realistic vision. In addition, they also play a special role in controlling the development of myopia and astigmatism in adolescents and treating special eye diseases.

[0003] The three major production processes of contact lenses are turning, centrifugal and molding. The characteristics of lenses produced by molding are that the lenses are soft, comfortable to wear and have no foreign body sensation. The molding process is to use metal molds to make polyester lower molds and upper molds, and the metal molds are polished by precision CNC machine tools; liquid lens monomers are dripped into the lower mold, and the upper mold is inserted into the lower mold and fastened, cured by ultraviolet radiation, and the mold is opened and trimmed; different structural shape designs of the mold often affect the design and construction of the production equipment and the complexity of the production process, the smoothness and convenience of production, and especially affect the quality and pass rate of the lenses in each process. How to design high-quality upper or lower molds for making contact lenses is an urgent problem to be solved. Utility Model Content

[0004] The utility model aims to provide a concave mold and a convex mold structure for making contact lenses, so as to solve the related problems in the prior art.

[0005] The technical solution of the utility model is: a concave mold and a convex mold structure for making contact lenses, wherein the convex mold covers the inside of the concave mold to form a mold cavity for making contact lenses;

[0006] The die comprises a first annular boss, a first annular step with an L-shaped cross section extending downward based on the inner ring of the first boss, and a first disc extending downward based on the inner ring of the first annular step; the first disc comprises a conical ring and a die cavity disc connected in sequence from top to bottom, the conical ring has a large opening at the upper end and a small opening at the lower end, and the inner surface of the die cavity disc protrudes from the inner surface of the conical ring;

[0007] The punch includes a second annular boss, a second annular step with an L-shaped cross section extending downward based on the inner ring of the second boss, and a second disc extending downward based on the inner ring of the second annular step; the second disc includes a connecting ring and a punch cavity disc connected in sequence from top to bottom, and when the punch is covered on the die, the die cavity disc and the punch cavity disc enclose a mold cavity.

[0008] Preferably, when the male die is covered on the female die, the first annular step and the second annular step are interference fit.

[0009] Preferably, the outer surface of the connecting ring is provided with a plurality of rectangular teeth evenly spaced vertically downward along its circumference.

[0010] Preferably, the outer surface of the vertical portion of the second annular step in contact with the first annular step is evenly spaced with a plurality of protrusions, and the plurality of protrusions are arranged along the circumference of the second annular step.

[0011] Preferably, a plurality of first cushion blocks are protruding upward from the top surface of the horizontal portion of the first annular step.

[0012] Preferably, a plurality of second pads are provided on the bottom surface of the horizontal portion of the second annular step protruding downward.

[0013] Preferably, when the male mold is covered on the female mold, there is a space between the connecting ring and the conical ring.

[0014] Compared with the prior art, the advantages of the utility model are:

[0015] (1) The utility model discloses a structure of a male and female mold for making contact lenses. When the male mold is covered on the female mold, the first annular step and the second annular step are interference fit. The interference fit realizes self-locking between the male mold and the female mold after covering. The self-locking structure can effectively prevent the male and female molds from being stretched apart when the liquid lens is solidified, and can also ensure the consistency of the lens thickness of contact lenses produced in different batches.

[0016] (2) In the utility model, the outer surface of the connecting ring is provided with a plurality of rectangular teeth evenly spaced vertically downward along its circumference; after the mold is closed and solidified, the overflowed excess lens-making material is solidified and wrapped around the rectangular teeth of the male mold and taken away by the male mold, and the finished contact lens is left in the female mold and enters the next process together, thereby preventing the excess solidified lens-making material from falling into the female mold and affecting the lens.

[0017] (3) The arrangement of the multiple protrusions and the first pad and the second pad in the utility model ensures that when the male mold is covered on the inside of the female mold, there is a gap between the first step and the second step; if there is no gap between the first step and the second step, the male mold and the female mold will form a closed space when they are covered, which will be very laborious and not conducive to the molding of contact lenses.

[0018] (4) In the present invention, when the male mold is covered on the female mold, there is a space between the connecting ring and the conical ring, which facilitates the overflow of excess liquid lens monomer in the mold cavity of the contact lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 It is a schematic structural diagram of the top view of the male mold described in this embodiment;

[0021] Figure 2 It is a structural schematic diagram of the male mold of this embodiment from an upward angle;

[0022] Figure 3 It is a schematic structural diagram of the top view of the concave mold described in this embodiment;

[0023] Figure 4 It is a schematic structural diagram of the concave mold of this embodiment from an upward angle;

[0024] Figure 5 This is a schematic diagram of the structure in which the male mold covers the inside of the female mold according to this embodiment;

[0025] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure.

[0026] Among them: 1. die, 2. punch, 3. first boss, 4. first annular step, 5. conical ring, 6. die cavity disc, 7. second boss, 8. second annular step, 9. connecting ring, 10. punch cavity disc, 11. protrusion, 12. rectangular teeth, 13. first gasket, 14. second gasket. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0028] In the description of the utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0029] like Figure 1-Figure 6 As shown, a concave mold and a convex mold structure for making contact lenses, the convex mold 2 covers the inside of the concave mold 1 to form a mold cavity for making contact lenses, the mold cavity is as shown in FIG. Figure 6 As shown in the black shaded part; the die 1 includes a first annular boss 3, a first annular step 4 with an L-shaped cross section extending downward based on the inner ring of the first boss 3, and a first disc extending downward based on the inner ring of the first annular step 4; the first disc includes a conical ring 5 and a die cavity disc 6 connected in sequence from top to bottom, the conical ring 5 has a large opening at the upper end and a small opening at the lower end, and the inner surface of the die cavity disc 6 protrudes from the inner surface of the conical ring 5.

[0030] The punch 2 includes an annular second boss 7, a second annular step 8 with an L-shaped cross section extending downward based on the inner ring of the second boss 7, and a second disc extending downward based on the inner ring of the second annular step 8; the second disc includes a connecting ring 9 and a punch cavity disc 10 connected in sequence from top to bottom. When the punch 2 is covered on the die 1, the die cavity disc 6 and the punch cavity disc 10 enclose a mold cavity.

[0031] When the punch 2 is covered on the die 1, the first annular step 4 and the second annular step 8 are interference fit; the vertical portion of the second annular step 8, wherein the outer surface in contact with the first annular step 4 is evenly spaced with a plurality of protrusions 11, the plurality of protrusions 11 are arranged along the circumference of the second annular step 8, and the interference fit of the first annular step 4 and the second annular step 8 is achieved by the plurality of protrusions 11; the interference fit achieves self-locking between the punch 2 and the die 1 after they are covered, and the self-locking structure can effectively prevent the punch 2 and the die 1 from being stretched apart when the liquid lens is solidified, and can also ensure the consistency of the lens thickness of contact lenses produced in different batches.

[0032] The outer surface of the connecting ring 9 is evenly spaced vertically downward along its circumference. The rectangular teeth 12 are arranged to: after the mold is closed and solidified, the excess lens-making material that overflows is solidified and wrapped on the rectangular teeth 12 of the male mold 2 and taken away by the male mold 2, and the finished contact lens is left in the female mold 1 and enters the next process together, so as to prevent the excess solidified lens-making material from falling into the female mold 1 and affecting the lens. The top surface of the horizontal part of the first annular step 4 is provided with a plurality of first pads 13 protruding upward, and the bottom surface of the horizontal part of the second annular step 8 is provided with a plurality of second pads 14 protruding downward; the arrangement of the plurality of protrusions 11 and the first pads 13 and the second pads 14 ensures that when the male mold 2 is covered inside the female mold 1, there is a gap between the first step and the second step; if there is no gap between the first step and the second step, when the male mold 2 and the female mold 1 are covered, it is a closed space, and the covering of the two will be very laborious and not conducive to the molding of the contact lens. When the male mold 2 is covered on the female mold 1, there is a space between the connecting ring 9 and the conical ring 5, which is convenient for the excess liquid lens monomer in the mold cavity of the contact lens to overflow.

[0033] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

Claims

1. A concave and convex mold structure for making contact lenses, characterized in that: The male mold covers the inside of the female mold to form a mold cavity for making contact lenses; The die comprises a first annular boss, a first annular step with an L-shaped cross section extending downward based on the inner ring of the first boss, and a first disc extending downward based on the inner ring of the first annular step; the first disc comprises a conical ring and a die cavity disc connected in sequence from top to bottom, the conical ring has a large opening at the upper end and a small opening at the lower end, and the inner surface of the die cavity disc protrudes from the inner surface of the conical ring; The punch includes a second annular boss, a second annular step with an L-shaped cross section extending downward based on the inner ring of the second boss, and a second disc extending downward based on the inner ring of the second annular step; the second disc includes a connecting ring and a punch cavity disc connected in sequence from top to bottom, and when the punch is covered on the die, the die cavity disc and the punch cavity disc enclose a mold cavity.

2. A concave and convex mold structure for making contact lenses according to claim 1, characterized in that: When the male die is covered on the female die, the first annular step and the second annular step are interference fit.

3. A concave and convex mold structure for making contact lenses according to claim 1, characterized in that: The outer surface of the connecting ring is provided with a plurality of rectangular teeth evenly spaced vertically downward along the circumference thereof.

4. A concave and convex mold structure for making contact lenses according to claim 2, characterized in that: An outer surface of the vertical portion of the second annular step in contact with the first annular step is evenly spaced with a plurality of protrusions, and the plurality of protrusions are arranged along the circumference of the second annular step.

5. The concave and convex mold structure for making contact lenses according to claim 1, characterized in that: A plurality of first cushion blocks are protruding upward from the top surface of the horizontal portion of the first annular step.

6. A concave and convex mold structure for making contact lenses according to claim 1, characterized in that: A plurality of second pads are protruding downward from the bottom surface of the horizontal portion of the second annular step.

7. A concave and convex mold structure for making contact lenses according to claim 1, characterized in that: When the male die is covered on the female die, there is a space between the connecting ring and the conical ring.

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