WO2003002322A1 - Moule de formage pour lentille de contact et procede de fabrication de lentille de contact au moyen d'un tel moule de formage - Google Patents
Moule de formage pour lentille de contact et procede de fabrication de lentille de contact au moyen d'un tel moule de formage Download PDFInfo
- Publication number
- WO2003002322A1 WO2003002322A1 PCT/JP2002/006309 JP0206309W WO03002322A1 WO 2003002322 A1 WO2003002322 A1 WO 2003002322A1 JP 0206309 W JP0206309 W JP 0206309W WO 03002322 A1 WO03002322 A1 WO 03002322A1
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- Prior art keywords
- mold
- male
- female
- fitting
- molding
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/26—Moulds or cores
- B29C39/32—Moulds or cores with joints or the like for making the mould impervious
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0038—Moulds or cores; Details thereof or accessories therefor with sealing means or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00038—Production of contact lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00038—Production of contact lenses
- B29D11/00125—Auxiliary operations, e.g. removing oxygen from the mould, conveying moulds from a storage to the production line in an inert atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/0048—Moulds for lenses
- B29D11/0049—Double sided moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/0048—Moulds for lenses
- B29D11/005—Moulds for lenses having means for aligning the front and back moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
- B29L2011/0041—Contact lenses
Definitions
- the present invention relates to a contact lens molding die for producing a contact lens by a molding method, and a method for producing a contact lens using the same. Particularly, the present invention relates to a method for stably forming a lens edge portion in a molding cavity. A contact lens that can be closed and can stably obtain the fitting and fixing force of the male and female molds, and can stably mold the target contact lens. The present invention relates to a mold for molding and a method of manufacturing a contact lens using the mold. Background art
- a molding method has been known as a kind of manufacturing method that can be employed for both hard contact lenses and soft contact lenses.
- a female mold having a concave molding surface and a male mold having a convex molding surface are matched to form a contact lens formed between the male and female molds.
- a contact lens having a shape corresponding to a molding cavity is manufactured by filling a predetermined polymerizable material as a lens molding material and polymerizing with a molding cavity, and other known contacts.
- the desired contact Since lenses can be mass-produced at low cost, they are suitably used, for example, in the production of disposable contact lenses.
- both male and female molds are supplied with a polymerizable material, matched, and then transferred to a polymerization device such as ultraviolet irradiation or heating, where they are processed. It is desirable that both the male and female molds be firmly held in the matching state in order to carry out the process stably.
- the present invention has been made in view of the above-mentioned circumstances, and a problem to be solved is that the molding cavity can be stably closed at the time of mold matching, and the male and female A contact lens molding die with a new structure that is capable of stably obtaining the mating and fixing force of the mold and stably molding the target contact lens.
- An object of the present invention is to provide a method of manufacturing a contact lens using the method. Disclosure of the invention
- the feature of the present invention relating to a contact lens mold is that it includes a female mold having a concave-formed surface and a male mold having a convex-formed surface.
- a contact lens molding die for forming a contact lens molding cavity between mold mating surfaces comprising: an outer peripheral portion of the convexly formed surface of the male die and a concavely formed surface of the female die.
- a cylindrical fitting portion extending toward one side in the axial direction is provided, and when the male and female types are mated, the cylindrical fitting portions are fitted with a gap therebetween in the radial direction.
- it extends continuously over the entire circumference.
- the convex part or the concave part of the mold having the convex portion is brought into contact with the outer peripheral side of the convex or concave molding surface so as to be deformed by a molding force.
- the outer peripheral portion of the shaped cavity is closed, and the fitting projection fills the radial gap between the inner and outer cylindrical fitting portions, so that the male and female types are fitted. That is, the joint fixing force is exerted.
- a fitting projection is formed at a specific portion of one of the male and female molds, and the fitting projection is formed at the time of mold matching. Outside the cavity By making the peripheral portion abut against the other mold and positively deforming, the outer periphery of the molding cavity is closed by such a fitting projection, and the male and female molds are fitted together. The gap between the walls is filled so that the fitting and fixing force can be exhibited.
- the outer peripheral edge of the molding cavity can be easily and easily formed without requiring a large matching force enough to deform the forming cavity surface of the female mold and the male mold.
- the fitting projection employed in the contact lens molding die according to the present invention includes, for example, (a) such a fitting projection as a male-type convex forming surface or a female-type concave forming surface. It is composed of a ring-shaped thin fin that extends from the rising corner of the cylindrical fitting portion at the outer peripheral edge toward the outer periphery, and when the male and female molds are combined, the thin fin is The two molds are bent rearward in the direction of mating, opposite to the molding cavity, and come into close contact with the inner peripheral surface of the cylindrical fitting part that is fitted to the outer periphery when mating the male and female dies.
- such a fitting projection is formed by a male convex-formed surface or a female concave-formed surface. From the rising edge of the cylindrical fitting at the outer peripheral edge of It is projected with a sharp projecting tip protruding outward in the radial direction, while it is inclined to the inner peripheral surface of the cylindrical fitting part that is fitted on the outer peripheral side when male and female molds are matched. Contact inclination This is advantageously achieved by providing a slope so that when the male and female molds are mated, the fitting projections are brought into contact with the corresponding contact slopes so that the mating force deforms them closely. You will get.
- the thin fins are inclined and protruded rearward in the molding direction of the cylindrical fitting portions of the male and female dies.
- the bending deformation of the thin fin is easily and stabilized, and the workability of the male and female mold matching can be improved, and the centering action of the male and female molds by the thin fin can be improved. Stability can also be improved.
- the thickness of the thin fins depends on the type of material and the size of the gap between the inner and outer fitting walls of the male and female molds, etc., but is made of synthetic resin such as polypropylene or polyethylene. In such a case, it is desirable that the thickness of the thin fin be in the range of 0.05 to 0.05 mm.
- the lid is too thin, it will be difficult to form a stable thin fin, and if it is too thin, it will be easily damaged.On the other hand, if it is too thick, the thin fin will not be easily deformed during mold matching. This is because it is difficult to enter the gap between the inner and outer fitting walls of the male and female molds, and the workability of the male and female molds is reduced.
- a male mold or a female mold having a thin fin is formed by fixedly combining a plurality of combination molds.
- the die combination surface of the combination die at the leading end of the thin fin in the protruding direction, the convex or concave molding surface of the male or female die having the thin fin can be integrated.
- the configuration formed by the two combination molds is advantageously employed.
- a thin fin is advantageously formed. In addition to this, the presence of the mold combination surface on the molding surface is avoided, and molding failure due to the mold combination surface can also be avoided.
- a fitting projection is provided with an acute projecting tip with respect to one of the molds, and this acute projecting tip is matched with the mold.
- the fitting projection is extremely advantageously deformed by the molding force, so that the male and female molds are brought into close contact with each other. It can be fitted and fixed.
- the axial projection amount and the radial projection amount of the fitting projection having the sharp projection tip the shape of the outer peripheral edge of the molding cavity of the contact lens can be improved.
- the edge shape of the formed contact lens can be appropriately adjusted.
- a rounded chamfer, a cut-shaped chamfer, or the like may be applied to a sharp-angled projecting tip of the fitting protrusion.
- the convex molding surface of the male mold is formed with respect to the outer peripheral edge of the convex molding surface forming the molding surface of the lens edge portion.
- a configuration in which a shoulder portion protruding toward the side where the radius of curvature is located is provided, and the fitting projection is formed to project from a corner of the shoulder portion is suitably adopted.
- the male mold and the female mold which form the molding cavity of the intended contact lens are subjected to both molds under the matching condition.
- the radial gap be formed to have a size of 0 to 0.1 mm between the outer fitting wall portions. If the size of the gap is 0 or less, it will be difficult to perform the fitting work of the inner and outer fitting walls at the time of male and female mold matching, and air and excess material will escape from the molding cavity at the time of mold matching. In addition, there is a risk that the load imposed during mold matching will increase due to dimensional errors during mold molding, and the molding surface of the contact lens may be deformed, resulting in a decrease in molding accuracy. is there.
- the size of the gap is larger than 0.1 mm, the shape of the edge of the contact lens, which is a molded product, varies widely due to variations in the deformation of the fitting projections, and sufficient molding accuracy is secured. This is because the filling of the gap between the fitting protrusions becomes unstable, and it becomes difficult to stably obtain the fitting fixing force of the male and female molds.
- the contact lens molding die having a structure according to the present invention at least an inner peripheral surface of the cylindrical fitting portion which is fitted to an outer peripheral side when the male die and the female die are mated.
- the tapered cylindrical inclined surface in which the area where the fitting projection comes into contact with the outer peripheral portion of the convex or concave molding surface, is gradually reduced in diameter as approaching the molding surface. Is also possible.
- the inclination angle of the tapered cylindrical inclined surface with which the fitting protrusion is brought into contact is preferably 4 to the central axis. It is desirable that the angle be 5 degrees or less, more preferably 20 degrees or less. If the angle of inclination of the slope is too large, the error of the angle of inclination will have a greater effect on the lens shape, and the fitting protrusion will come into contact with the slope before reaching the target contact position. This is because there is a possibility that the molding accuracy may be reduced due to such factors.
- an inner peripheral surface on an opening side of the cylindrical fitting portion which is fitted to an outer peripheral side when the male die and the female die are mated.
- a fitting guide surface for guiding the cylindrical fitting portion fitted on the inner peripheral side in the fitting direction when the male mold and the female mold are mated. Can be suitably adopted.
- the cylindrical fitting portion fitted to an outer peripheral side at the time of the mold matching; It is also possible to form the fitting protrusion that is brought into contact with the cylindrical fitting portion from different materials. In particular, the fitting protrusion is brought into contact with the fitting protrusion. It is desirable to use a material that is more easily deformed than the cylindrical fitting part to be formed. As a result, the fitting projection can be stably deformed to the desired shape, and the dimensional error caused in the molding cavity due to unnecessary deformation of the female mold can be reduced or avoided.
- the contact lens molding die having the structure according to the present invention it is possible to employ stopper means for relatively defining the position where the male die and the female die are aligned. Therefore, both sexes The deformed state of the fitting projection at the time of mold matching can be stabilized, and moreover, it is possible to stably form the molding cavity between the male and female molds with a shape intended for molding cavity with higher accuracy.
- the female mold and the male mold are made of a material having sufficient rigidity and strength to withstand the operation of forming the contact lens in the molding cavity. It is possible to adopt as appropriate. For example, various synthetic resins, metals, glass, ceramics, etc. can be adopted. At least the male mold is desirably made of synthetic resin or soft metal in order to ensure the deformability and the required strength of the fitting projection.
- the male mold is preferably made of polypropylene, polyethylene, or polyethylene terephthalate. Thermoplastic or thermosetting synthetic resin such as phthalate, polystyrene, polycarbonate, polyvinyl chloride, polyamide, polyacetal, fluororesin, etc. And, aluminum alloy, copper, gold, metals such as silver, is preferably employed as a male-type material.
- the molded contact lens can be stably adhered to one of the male and female molds when the mold is opened after molding the contact lens.
- high-frequency glow discharge treatment, corona discharge treatment, ultraviolet irradiation treatment, atmospheric pressure plasma treatment, etc. are performed on at least the cavity forming surface of either or both types. It is effective to employ various known techniques for adjusting the releasability, such as a molding surface treatment using an adhesive capable of exhibiting a removable adhesive force.
- Post-molding treatment such as demolding becomes easy.
- a feature of the present invention relating to a method for manufacturing a contact lens is that a female mold and a male mold are formed by using a contact lens mold having a structure according to the present invention as described above.
- the female mold and the male mold are used. Due to the mold matching, the fitting protrusion protruding from the cylindrical fitting portion fitted on the inner peripheral side is pressed against the cylindrical fitting portion fitted on the outer peripheral side to be deformed.
- the fitting projections protruding from one mold are brought into contact with the other mold at the outer peripheral edge of the molding cavity to positively deform.
- the outer peripheral edge of the molding cavity can be closed, and the gap between the mating walls of the male and female molds can be filled to obtain a fitting fixing force.
- the molding force closes the molding cavity, making it possible to stably manufacture contact lenses free of molding defects such as burrs, and the fitting and fixing force that holds the male and female molds in the molded state. It can be advantageously used, and the handleability of the mold during the subsequent polymerization or the like is improved, and excellent productivity can be realized.
- the male mold and the female mold are combined to form a closed molded cavity, and when the male and female molds are fitted and fixed, the male and female molds are fixed. It is desirable to apply a mold force of 1 N to 300 N to the mold. This makes it possible to advantageously deform the fitting projection formed in the male or female mold into the desired shape while avoiding deformation of the molded surface of the contact lens in both the male and female molds.
- FIG. 1 is a vertical cross-sectional view showing a female mold and a male mold that constitute a contact lens molding die as a first embodiment of the present invention.
- FIG. 2 is an explanatory diagram showing a main part of FIG. 1 in an enlarged manner.
- FIG. 3 is a longitudinal sectional view showing a male mold constituting the contact lens forming mold shown in FIG.
- FIG. 4 is an explanatory diagram showing an enlarged main part of FIG.
- FIG. 5 is a longitudinal cross-sectional view showing a female mold and a male mold forming a contact lens forming mold according to a second embodiment of the present invention in a matching state.
- FIG. 6 is an explanatory diagram showing an enlarged main part of FIG. FIG.
- FIG. 7 is a longitudinal sectional view showing a male mold constituting the contact lens forming mold shown in FIG.
- FIG. 8 is an explanatory diagram showing an enlarged main part of FIG.
- FIG. 9 is an enlarged vertical sectional view of a main part showing a mold matching state of a contact lens forming die as another embodiment of the present invention.
- FIG. 10 is an enlarged longitudinal sectional view of a main part showing a male mold constituting a contact lens forming mold as still another embodiment of the present invention.
- FIG. 11 is an enlarged vertical sectional view of a main part showing a male mold constituting a mold for a contact lens as still another embodiment of the present invention.
- FIG. 12 is an enlarged longitudinal sectional view of a main part showing a male mold constituting a contact lens forming mold as still another embodiment of the present invention.
- FIG. 13 is an enlarged vertical sectional view of a main part showing a mold matching state of a contact lens forming die as still another embodiment of the present invention.
- FIG. 14 shows yet another embodiment of the present invention.
- FIG. 2 is an enlarged longitudinal sectional view of a main part showing a mold matching state of a contact lens forming die as a state.
- FIG. 15 is an enlarged vertical sectional view of a main part showing a male mold constituting a contact lens forming mold as still another embodiment of the present invention.
- FIG. 16 is an enlarged longitudinal sectional view of a main part showing a male mold constituting a contact lens forming mold as still another embodiment of the present invention.
- FIG. 17 is a longitudinal sectional view showing a mold matching state of a mold for a contact lens as still another embodiment of the present invention.
- FIG. 18 is an enlarged longitudinal sectional view of a main part showing a female die constituting the contact lens forming die shown in FIG.
- FIG. 19 is an enlarged longitudinal sectional view of a main part in FIG.
- FIG. 20 is a longitudinal sectional view showing a mold matching state of a contact lens forming die as still another embodiment of the present invention.
- FIG. 21 is an enlarged longitudinal sectional view of a main part showing a female die constituting the contact lens forming die shown in FIG. 20.
- FIG. 22 is an enlarged longitudinal sectional view of a main part in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a contact lens mold 10 as a first embodiment of the present invention.
- the molding die 10 is composed of a female die 12 and a male die 14, and by being matched with each other, as shown in the figure, a space between the mating surfaces of the male and female dies 12 and 1 is formed.
- a contact lens molding cavity 16 is formed at the same time.
- the female mold 12 is made of a suitable synthetic resin such as polypropylene. It is formed as an integral molded product with a suitable synthetic resin such as polypropylene.
- the concave surface of the central portion 18 forms a concave shaped surface 20 corresponding to the front curve of the target contact lens.
- a cylindrical wall portion 22 as an outer fitting wall is formed on the outer peripheral edge of the central portion 18 toward the center of curvature of the concave molding surface 20, that is, toward the upper side in FIG. 1. ing.
- the inner peripheral surface of the cylindrical wall portion 22 extends from the outer peripheral edge of the concave molded surface 20 in the axial direction over a predetermined length to form a fitting inner peripheral surface 2 having a cylindrical inner peripheral surface shape.
- a fitting guide surface 26 in the form of a tapered cylinder that expands toward the opening with a large taper angle is formed on the opening side of the fitting inner peripheral surface 24.
- the fitting inner peripheral surface 24 is also provided with a small taper angle that spreads slightly toward the opening side, so that the fitting inner peripheral surface 24 has a contact inclination. It is formed as a surface. Further, a ring-shaped flange portion 28 is formed at the opening edge of the cylindrical wall portion 22. The flange portion 28 is formed continuously over the entire circumference in the circumferential direction in a state protruding outward in the direction perpendicular to the axis. The flange portion 28 forms a center with the cylindrical wall portion 22. The overall rigidity of the portion 18 is improved, and the central axis direction and the horizontal direction of the concave molding surface 20 of the central portion 18 can be easily determined. In addition, in the female mold 12, the thickness is determined in consideration of the material and the like so that at least the concave molding surface 20 can exhibit sufficient deformation resistance against an external force exerted at the time of mold matching or the like. Dimensions are set.
- male type 14 is, like female type 12, suitable for polypropylene or the like. It is made of a suitable synthetic resin material, and its central part 30 has a spherical shell shape protruding toward one side in the axial direction (downward in FIG. 1). The convex side surface of the central portion 30 forms a convex molding surface 32 corresponding to the target base lens curve of the lens.
- the outer peripheral edge of the central portion 30 is provided with a cylindrical wall 34 as an inner fitting wall toward the center of curvature of the convex molding surface 32, that is, toward the upper side in FIG. Is formed.
- a portion of the outer peripheral surface of the cylindrical wall portion 34 which extends from the lower end portion in the axial direction to a predetermined length, is a fitting outer peripheral surface 36 having a cylindrical outer peripheral surface shape.
- a ring-shaped flange 38 is formed at the opening edge of the cylindrical wall 34. The flange 38 is formed so as to protrude outward in the direction perpendicular to the axis, and is formed continuously over the entire circumference in the circumferential direction.
- the rigidity of the entire portion 30 is improved, and the central axis direction and the horizontal direction of the convex molding surface 32 of the central portion 30 can be easily determined.
- the thickness dimension of each part is set in consideration of the material etc. so that the convex molding surface 32 is not deformed by the action of the molding force etc. Have been.
- the central portion 30 of the male type 14 is slightly smaller than the central portion 18 of the female type 12, and the fitting outer circumference of the cylindrical wall portion 34 of the male type 14 is formed.
- the outer diameter of the surface 36 is set to be smaller by a predetermined amount than the inner diameter of the fitting inner peripheral surface 24 in the cylindrical wall portion 22 of the female mold 12.
- the male mold 14 has a curved or bent cross-section in which the outer peripheral edge of the convex molding surface 32 is convex on the center of curvature of the convex molding surface 32, and has A shoulder portion 41 extending continuously over the entire length is formed.
- the outer peripheral edge of the shoulder portion 41 is connected to the lower end edge of the outer peripheral surface 36 of the cylindrical wall portion 34, and at this connection portion, a thin wall as a fitting protrusion is formed. Is formed.
- This thin fin 42 has a thin annular plate shape as shown in FIGS. 3 to 4 which show the male die 14 alone, and has a lower end of the fitting outer peripheral surface 36. It is formed integrally with the male mold 14 so as to spread in the direction perpendicular to the axis from the edge.
- the thickness of the thin fin 42 is set to 0.0 so that the lens edge portion can be formed in an advantageous shape and the strength and flexural deformability of the thin fin 42 itself can be exhibited at the same time. It is desirable to set within the range of 0.5 to 0.05 mm.
- the projected dimension of the thin fins 42 is the same as that of the gap 40 formed between the mating inner peripheral surface 24 and the mating outer peripheral surface 36 under the matching condition of the male and female dies 12, 14. Therefore, it is preferable that the protrusions are formed with a protrusion height dimension twice or more the gap 40.
- the thin fins 42 protruding from the male mold 14 are attached to the inner surface of the cylindrical wall 22 of the female mold 12, namely By being brought into contact with the mating guide surface 26 and the mating inner peripheral surface 24, it is bent to one side in the axial direction toward the opening side of the cylindrical wall portion 22. It is configured to be bent along the fitting guide surface 26 and the fitting inner peripheral surface 24. As a result, as shown in FIG. 2, the thin fins 42 are bent substantially at the base end portion in the circumferential direction, as shown in FIG. Then, based on the elasticity or the like of the thin fins 42 themselves, the thin fins 42 can be superimposed on the fitting inner peripheral surface 24 of the female mold 1 in a close state.
- the thin fins 4 protruding from the male die 14 are formed by combining the male and female dies 12 and 14. Is held elastically in close contact with the female mold 12, the gap 40 between the male and female molds 12, 14 can be closed by the thin fin 42.
- the outer peripheral edge of the molding cavity 16 formed between the opposing surfaces of the male and female dies 12, 14 and the molding surfaces 20, 32 is closed by such thin fins 42, Thus, a closed molding cavity having a shape corresponding to the contact lens to be formed can be formed.
- the thin fins 42 are bent by applying a predetermined molding force to the male and female dies 12, 14, and then are bent based on the elasticity of the thin fins 42 themselves. Since the pressure is maintained against the inner peripheral surface 24 of the fitting, an effective fitting fixing force can be exerted between the male and female dies 12 and 14.
- the female mold 12 and the male mold 14 as described above can be manufactured by a conventionally known resin molding method.
- the outer shape of the intended female mold 12 or male mold 14 can be manufactured. It can be advantageously manufactured by injection molding or the like using a molding die that forms a molding cavity that gives a shape.
- the contact train consisting of female type 1 2 and male type 1 4
- mold molding polymerizing
- the target contact lens using the lens mold 10 first, the female mold 12 is supported in a state where it is opened vertically upward, and the center of the female mold 12 is opened.
- An appropriate polymerizable material for obtaining a target contact lens is supplied to the saucer-shaped region formed by the concave molding surface 20 of the portion 18.
- Such a monomer composition is generally composed of one or two or more conventionally used radically polymerizable compounds. Even if it is composed of, such a compound is mixed with an appropriate crosslinking agent or an additive such as a polymerization initiator, for example, a thermal polymerization initiator, a photopolymerization initiator, a sensitizer, or the like, if necessary. It is a monomer composition.
- the male mold 14 is superimposed on the female mold 12 from above vertically, with their central axes aligned.
- the superposition of the male and female molds 12, 14 is performed by axially fitting the cylindrical wall 3 of the male mold 14 along the mating guide surface 26 of the female mold 12, and The mating force is exerted in the axial direction between the female mold 12 and the male mold 14 so that the mating outer peripheral face 36 of the male mold 14 fits with the mating inner peripheral face 24 of the female mold 12.
- the convex molding surface 32 of the male mold 14 is superimposed on the concave molding surface 20 of the female mold 12.
- a spacer having an appropriate thickness is provided between the flanges 28 and 38 of the male and female molds 12 and 14 in the axial direction.
- both sexes 1 2, 1 4 Can be set.
- the male and female molds 12 and 14 are overlapped in the axial direction, and a predetermined mold-matching force (clamping force) is exerted on the male and female molds 12 and 14 in the axial direction.
- a predetermined mold-matching force clamping force
- the gap 40 between the mating inner and outer peripheral surfaces 24 and 36 of the male and female molds 12 and 14 is determined by the thin fins 42 by positioning the members 2 and 14 relative to each other.
- the male and female molds 12 and 14 are fitted and fixed with thin fins 42.
- the molding cavity 1 having a shape corresponding to the desired contact lens shape is placed between the concave and convex molding surfaces 20 and 32 of the male and female molds 12 and 14. 6 and the polymerizable material supplied to the concave molding surface 20 of the female mold 12 is pushed outward in the outer circumferential direction between the male and female molds 12, 14 so that the entire molding cavity 16 is formed. Spread and fill. The excess polymerizable material is guided to the outside of the molding cavity 16 through the gap 40 between the male and female molds 12 and 14.
- the mold-matching force is released or not released, and the polymerization treatment for the polymerizable material filled in the molding cavity 16 is performed.
- Polymerization of the polymerizable material comprising such a liquid monomer composition is carried out, for example, according to a usual thermal polymerization method or a usual photopolymerization method, but when the latter photopolymerization method is employed. Since it is necessary to irradiate the polymerizable material with light such as UV light, at least one of the genders 12 and 14 should be made of a material that can transmit light, and especially desirable is transparency. The light is guided through such a mold, and the polymerizable material is polymerized.
- the contact of the desired shape corresponding to the shape of the concave and convex molding surfaces 20 and 32 of the male and female molds 12 and 14 is obtained.
- the lens is molded.
- the male and female molds 12 and 14 are opened, and then the contact adhered to the molding surfaces 20 and 32 of either of the male and female molds 12 and 14.
- the production of the contact lens is completed.
- the use of the contact lens forming mold 10 of the present embodiment as described above allows the outer peripheral edge of the molding cavity 16 to be stable when the male and female molds 12 and 14 are combined.
- the desired molding cavity 16 can be formed with high precision, and the force for holding the male and female dies 12 and 14 in the matched state can be efficiently and stably exhibited.
- FIGS. 5 to 8 show a contact lens molding die 50 as a second embodiment of the present invention.
- the structure is the same as that of the contact lens molding die 10 in the first embodiment.
- the same reference numerals as in the first embodiment denote the same members and parts in the drawings, and a detailed description thereof will be omitted.
- the lower end edge of the fitting outer peripheral surface 36 of the male die 14 is attached to the thin fin 42 (see FIG. 3) in the first embodiment.
- an annular projection 52 is formed.
- the annular projection 52 is formed on the convex molding surface 3 of the male mold 14.
- the outer peripheral edge portion 2 is fixedly provided at the rising edge of the cylindrical wall portion 34 as an inner fitting wall, in other words, at the outer peripheral edge portion of the shoulder portion 41.
- the projection is provided with a mountain-shaped cross-section only downward in the axial direction without projecting radially outward from the rising corner of the cylindrical wall portion 34, and has a substantially constant cross-section. And has an annular shape extending continuously over the entire circumference in the circumferential direction.
- the annular projection 52 may be formed integrally with the male mold 14, but is preferably formed of a material that is more easily plastically deformed than the male mold 14 and the female mold 12.
- the annular projection 52 of such a different material can be formed substantially at the same time as the molding of the male mold 14 by using, for example, a two-color molding technique.
- the annular projection 52 has an outer peripheral surface obtained by linearly extending the outer peripheral surface 36 of the male mold 14 downward in the axial direction, and has an outer diameter dimension of the annular projection 52. However, it is set larger than the minimum inner diameter of the mating inner peripheral surface 24 of the female mold 11.
- the male and female dies 12 and 14 are matched by molding the male and female dies 12 and 14.
- the annular projection 52 is brought into contact with the fitting inner peripheral surface 24 as a contact inclined surface of the female mold 12 so that the annular projection 52 is dragged toward the opening by the frictional resistance of the fitting inner peripheral surface 24.
- it is gradually compressed and deformed to the bottom side, and as a result, the outer peripheral edge of the molding cavity 16 is closed by the deformed annular projection 52, thereby forming the desired molded cavity 16 in the sealed state.
- the gap 40 between the mating inner and outer peripheral surfaces 24 and 36 of the male and female molds 12 and 14 is filled.
- the male and female molds 12 and 14 can be advantageously fitted and fixed, and the desired molding cavity 16 is formed stably in a closed state.
- the target contact lens can be manufactured with high accuracy and stability.
- the female mold 12 when adopting the male mold 14 having the thin fins 42 as shown in the first embodiment, the female mold 12 is not used.
- the contact inclined surface 56 may have a curved tapered cross-sectional shape and may be formed so as to gradually decrease in diameter as it goes to the bottom side. The same effect as in the first embodiment can be effectively exerted.
- the thin fins formed on the male mold 14 include, for example, an inclined thin wall inclined in the mold-matching direction rearward with respect to the female mold 12 as shown in FIGS. 10 and 11. It is also possible to adopt the fins 60 and 62 or, as shown in FIG. 12, it is inclined rearward in the molding direction with respect to the female mold 12 and has a curved cross-sectional shape. It is also possible to employ a curved inclined fin 64. If such thin-walled fins 60, 62, and 64 are used, the thin-walled fins 60, 62, and 64 can be used for both male and female molds 11 and 14. It is possible to more smoothly realize the bending deformation that falls into the gap between the fitting surfaces of 12 and 14.
- annular protrusion 5 as shown in the second embodiment 5
- the contact inclined surface of the female mold 12 with which the annular protrusion 52 abuts has a larger inclination angle as shown in FIG. 13.
- a tapered inclined surface 66 or, as shown in FIG. 14, a curved inclined surface 68 having a smaller diameter as it goes to the bottom side in a curved cross-sectional shape. It is possible. By employing such a tapered inclined surface 66 or a curved inclined surface 68, it is possible to more effectively obtain the contact force of the annular projection 52 on the contact inclined surface during mold matching.
- the female mold 12 is formed so as to extend outward in the axial direction continuously to the opening side of the tapered inclined surface 66, so that it can be used for mold matching.
- a mating guide surface 67 for guiding the male mold 14 is provided.
- the male mold 14 further projects radially outward from the fitting outer peripheral surface 36 of the male mold 14.
- the annular projections 70 and 72 that are formed. In particular, by adopting such radial protrusion type annular protrusions 70 and 72, it is possible to more effectively obtain the contact force of the annular protrusion 5 with respect to the contact inclined surface of the female die 12 with the annular protrusion 5. This makes it possible to more effectively obtain the fitting and fixing force of the male and female molds 12 and 14.
- the molding shrinkage accompanied by the radial deformation is restricted by the central portion 30, so that the axial direction of the cylindrical wall portion 34 is smaller than the axially lower end portion of the cylindrical wall portion 34. Since the central part in the direction tends to be larger, by utilizing such molding shrinkage, the intended annular projections 70 and 72 can be easily formed while avoiding the undercut shape in the molding die. It becomes possible to do.
- a male mold 1 having a concave molding surface 20 is provided with a cylindrical wall portion 22 as an outer fitting wall on a female mold 1 having a concave molding surface 20 and a convex molding surface 32.
- a cylindrical wall 3 as an inner fitting wall is formed on the mold 14, and a fitting projection is formed on a corner of the boundary between the convex molding surface 32 of the male mold 14 and the cylindrical wall 34.
- a thin-walled fin 42 and an annular protrusion 52 were formed, but on the contrary, an inner fitting wall was provided on the female mold 12 and an outer fitting wall was formed on the male mold 14. It is also possible to form a fitting projection on the female mold 12 by providing the same.
- FIGS. 17 to 19 show a contact lens molding die 80 as an embodiment of the present invention.
- the molding die 80 is composed of a female die 82 and a male die 84, and by being matched with each other, as shown in the figure, the male and female die 82, 84 are formed.
- a contact lens molding cavity 86 is formed between the mold mating surfaces.
- the central portion 88 has a spherical shell shape protruding toward one side in the axial direction (downward in the figure), and the concave surface of the central portion 88 A concave molding surface 90 corresponding to the front curve of the contact lens is formed. Also, At the outer peripheral edge of the central portion 88, a cylindrical wall portion 92 as an inner fitting wall is formed on the side opposite to the center of curvature of the concave molding surface 90, that is, downward in the figure. .
- the cylindrical wall portion 92 is formed in a cylindrical shape with a taper that expands downward in the axial direction, extends downward in the axial direction from the central portion 88, and has a lower end opening peripheral portion. Is formed with a flange 94 extending radially outward.
- the male mold 84 has a central part 96 having a spherical shell shape protruding toward one side in the axial direction (downward in the figure).
- a convex molding surface 98 corresponding to the base curve of the contact lens is formed.
- a cylindrical wall portion 100 as an outer fitting wall is formed on the outer peripheral edge of the central portion 96 on the opposite side to the center of curvature of the convex molding surface 98, that is, downward in the figure.
- the cylindrical wall portion 100 has a tapered cylindrical shape that expands downward in the axial direction, extends downward in the axial direction from the central portion 96, and has a peripheral edge at the lower end opening.
- the collar 102 is formed with a flange 102 extending radially outward.
- the inner peripheral surface 104 of the cylindrical wall portion 100 of the male mold 84 has a larger taper angle than the outer peripheral surface of the cylindrical wall portion 92 of the female mold 82.
- the inside diameter of the small-diameter end is slightly reduced, and the inside diameter of the large-diameter end is increased.
- the inner peripheral surface 10 of the cylindrical wall portion 100 of the male mold 84 serves as a mating guide surface, and the mating of the male and female molds 82, 84 is performed.
- the small-diameter end portion of the cylindrical wall portion 92 of the female die 82 is guided by the inner peripheral surface 104 of the cylindrical wall portion 100 of the male die 84, and a predetermined length is obtained. It is guided to the matching position.
- Fig. 18 shows the main part of the female mold 82 by itself.
- a thin fin 106 serving as a fitting projection is formed at the small-diameter end of the cylindrical wall portion 92 of the female mold 82.
- the thin fin 106 has the same thin annular plate shape as the thin fin integrally formed in the male mold of the first embodiment, and has an outer peripheral edge of the concave molding surface 90.
- the cylindrical wall portion 100 is integrally formed with the female mold 82 in such a state that it spreads in a direction substantially perpendicular to the axis from a sharp-pointed tip of a sharp corner which is a connection portion with the small-diameter side end portion of the outer peripheral surface of the cylindrical wall portion 100.
- the female die 82 and the male die 84 are matched.
- the thin wall 106 projecting from the female mold 82 and the inner peripheral surface 104 of the cylindrical wall 100 of the male die 8 It is bent toward the opening side of the part 92, and closely contacts the inner peripheral surface 104 of the cylindrical wall part 100 of the male die 8 based on the elasticity of the thin fin 106 itself.
- the outer peripheral edge of the molding cavity 86 formed between the opposing surfaces of the molding surfaces 90.98 of the male and female dies 82, 84 is thinned. It is possible to form a closed molded cavity 86 having a shape corresponding to the intended con- nect lens by being closed at 6.
- FIGS. 20 to 22 members and parts having the same structure as the embodiment shown in FIGS. 17 to 19 above are shown in FIGS.
- the outer peripheral edge of the concave molding surface 90 in the female mold 82 and the small-diameter side edge of the outer peripheral surface of the cylindrical wall 100 are formed.
- the annular projection 110 has a projecting cross section and extends continuously in the circumferential direction in a state protruding in the axial direction and the direction perpendicular to the axis from the sharp-pointed sharp tip of the connecting portion.
- the female mold 82 is integrally molded.
- the contact lens forming die 112 of this embodiment provided with such an annular projection 110, as in the second embodiment, as shown in FIG.
- the annular projection 110 protruding from the female mold 84 contacts the inner peripheral surface 104 of the cylindrical wall section 100 of the male mold 84.
- the male mold 84 is closely overlapped with the inner peripheral surface 104 of the cylindrical wall 100 of the male mold 84, whereby the male and female molds 8 2
- the outer periphery of the molding cavity 86 formed between the opposing surfaces of the molding surfaces 90, 98 is closed by the crushed annular projection 110, corresponding to the target contact lens. It is possible to form a molded cavity 86 in a closed state.
- the thickness of the thin fin can be changed so as to become thinner toward the outer peripheral side.
- a thin fin for example, a thin resin sheet or the like is adhered to the convex molding surface 32 of the male mold 14, and an outer peripheral portion of the thin resin sheet is formed on an outer peripheral edge of the convex molding surface 32. By projecting radially outward from Thus, it is also possible to form a bond with the male mold 14.
- annular projections 52 are formed in an annular shape extending in the circumferential direction from the outer peripheral edge of the convex molding surface 32 of the male mold 14 to the lower end edge of the fitted outer peripheral surface 36. You may do it.
- annular projection to which the annular projection 5 projecting from the male mold 14 is brought into contact may be formed on the fitting inner peripheral surface 24 of the female mold 11 or the like.
- the fitting projection protruding from one of the molds to be mated is brought into contact with the other mold.
- the outer peripheral edge of the molded cavity is closed, and at the same time, the gap between the mating walls of the male and female molds is filled, and the fixing force of the male and female molds is developed. Therefore, it is possible to stably mold the contact lens of interest.
- the fitting projections protruding from one mold abut on the other mold to deform and form.
- the mold mating surface at the outer peripheral edge of the cavity can be stably closed
- Both male and female molds can be maintained in matched condition with effective mating and fixing force Therefore, it is possible to carry out molding of the target contact lens with high accuracy and stability.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Eyeglasses (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/482,343 US20040191353A1 (en) | 2001-06-27 | 2002-06-24 | Forming mold for contact lens, and method of manufacturing contact lens by using the forming mold |
EP02741273A EP1407866A4 (en) | 2001-06-27 | 2002-06-24 | CONTACT LENS FORMING MOLD AND METHOD OF MANUFACTURING CONTACT LENS USING SUCH A FORMING MOLD |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-195341 | 2001-06-27 | ||
JP2001195341A JP2003011139A (ja) | 2001-06-27 | 2001-06-27 | コンタクトレンズ用成形型およびそれを用いたコンタクトレンズの製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003002322A1 true WO2003002322A1 (fr) | 2003-01-09 |
Family
ID=19033330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/006309 WO2003002322A1 (fr) | 2001-06-27 | 2002-06-24 | Moule de formage pour lentille de contact et procede de fabrication de lentille de contact au moyen d'un tel moule de formage |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040191353A1 (ja) |
EP (1) | EP1407866A4 (ja) |
JP (1) | JP2003011139A (ja) |
WO (1) | WO2003002322A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004076160A1 (en) * | 2003-02-25 | 2004-09-10 | Concavex Ltd | Contact lens mould |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2856005B1 (fr) * | 2003-06-11 | 2007-03-23 | Essilor Int | Procede et dispositif de moulage d'une lentille optique, en particulier une lentille ophtalmique |
JP2006084658A (ja) * | 2004-09-15 | 2006-03-30 | Canon Inc | 光量調節用遮光羽根部材 |
US8287269B2 (en) * | 2005-12-12 | 2012-10-16 | Johnson & Johnson Vision Care, Inc. | Molds for use in contact lens production |
US20070138670A1 (en) * | 2005-12-20 | 2007-06-21 | Bausch And Lomb Incorporated | Method and Apparatus for the Dry Release of a Compliant Opthalmic Article from a Mold Surface |
WO2009088704A1 (en) | 2007-12-31 | 2009-07-16 | Bausch & Lomb Incorporated | Casting mold for forming a biomedical device including an ophthalmic device |
CN101890507B (zh) * | 2009-05-19 | 2013-04-24 | 鸿富锦精密工业(深圳)有限公司 | 模仁的制作方法 |
CA2850265C (en) | 2010-11-26 | 2020-01-14 | Daysoft Limited | Contact lens manufacturing method |
SG189572A1 (en) | 2011-10-18 | 2013-05-31 | Menicon Singapore Pte Ltd | Systems and methods for multi-stage sealing of contact lens packaging |
WO2013081959A1 (en) * | 2011-11-29 | 2013-06-06 | Novartis Ag | Method of treating a lens forming surface of at least one mold half for molding ophthalmic lenses |
US20180134475A1 (en) * | 2012-10-18 | 2018-05-17 | Menicon Singapore Pte Ltd. | Systems and Methods for Multi-Stage Sealing of Contact Lens Packaging |
GB2521628A (en) * | 2013-12-23 | 2015-07-01 | Sauflon Cl Ltd | Contact lens mould |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0015202A1 (fr) * | 1979-02-23 | 1980-09-03 | ESSILOR INTERNATIONAL Compagnie Générale d'Optique | Joint annulaire propre au moulage de lentilles ophtalmiques ou optiques en matière organique, et procédé de mise en oeuvre d'un tel joint |
WO1987004390A1 (en) * | 1986-01-28 | 1987-07-30 | Coopervision Optics Limited | Moulding contact lenses |
EP0367513A2 (en) * | 1988-11-02 | 1990-05-09 | Btg International Limited | Contact lens cast moulding |
JPH0489309U (ja) * | 1990-10-30 | 1992-08-04 | ||
WO1993004848A1 (en) * | 1991-09-12 | 1993-03-18 | Bausch & Lomb Incorporated | Method and apparatus for molding lenses |
US5238388A (en) * | 1991-12-06 | 1993-08-24 | Johnson & Johnson Vision Products, Inc. | Ophthalmic lens mold seal |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4121896A (en) * | 1976-03-24 | 1978-10-24 | Shepherd Thomas H | Apparatus for the production of contact lenses |
US4284399A (en) * | 1980-06-23 | 1981-08-18 | American Optical Corporation | Contact lens mold |
GB8507007D0 (en) * | 1985-03-19 | 1985-04-24 | Coopervision Optics | Casting lenses |
GB8606505D0 (en) * | 1986-03-17 | 1986-04-23 | Sealey M J | Contact lens mould |
GB8900616D0 (en) * | 1989-01-12 | 1989-03-08 | Galley Geoffrey H | Methods of manufacturing contact lenses |
IL102556A (en) * | 1991-08-16 | 1998-02-08 | Johnson & Johnson Vision Prod | Device and process for fusing detachable lens mold units |
GB9906240D0 (en) * | 1999-03-19 | 1999-05-12 | Ocular Sciences Limited | Lens mould |
-
2001
- 2001-06-27 JP JP2001195341A patent/JP2003011139A/ja not_active Withdrawn
-
2002
- 2002-06-24 WO PCT/JP2002/006309 patent/WO2003002322A1/ja not_active Application Discontinuation
- 2002-06-24 US US10/482,343 patent/US20040191353A1/en not_active Abandoned
- 2002-06-24 EP EP02741273A patent/EP1407866A4/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0015202A1 (fr) * | 1979-02-23 | 1980-09-03 | ESSILOR INTERNATIONAL Compagnie Générale d'Optique | Joint annulaire propre au moulage de lentilles ophtalmiques ou optiques en matière organique, et procédé de mise en oeuvre d'un tel joint |
WO1987004390A1 (en) * | 1986-01-28 | 1987-07-30 | Coopervision Optics Limited | Moulding contact lenses |
EP0367513A2 (en) * | 1988-11-02 | 1990-05-09 | Btg International Limited | Contact lens cast moulding |
JPH0489309U (ja) * | 1990-10-30 | 1992-08-04 | ||
WO1993004848A1 (en) * | 1991-09-12 | 1993-03-18 | Bausch & Lomb Incorporated | Method and apparatus for molding lenses |
US5238388A (en) * | 1991-12-06 | 1993-08-24 | Johnson & Johnson Vision Products, Inc. | Ophthalmic lens mold seal |
Non-Patent Citations (1)
Title |
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See also references of EP1407866A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004076160A1 (en) * | 2003-02-25 | 2004-09-10 | Concavex Ltd | Contact lens mould |
Also Published As
Publication number | Publication date |
---|---|
JP2003011139A (ja) | 2003-01-15 |
US20040191353A1 (en) | 2004-09-30 |
EP1407866A4 (en) | 2006-05-03 |
EP1407866A1 (en) | 2004-04-14 |
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