JP2004268596A - Mold for molding lens for eye and method for molding lens for eye using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for molding a lens for an eye capable of accurately molding a good edge part of the lens for the eye without requiring a sharp projection and a large mold clamping force to form a lens edge of the lens for the eye. <P>SOLUTION: In the mold for molding the lens for the eye, a male mold 2 and a female mold 4 are combined to form a molding cavity 6 with a shape providing the aimed lens for the eye between these molds. One of the male mold 2 and the female mold 4 has a lens forming part inside of a contact point A of these two molds and a mold peripheral part outside of the contact point, and the molding cavity is formed between the lens forming part and the other mold. At least a site in the neighborhood of the contact point of the lens forming part is a concave lens forming face 8 which is concave to the other mold, and at least the site in the neighborhood of the contact point of the peripheral part is a convex curved face 10 which is convex to the other mold. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a molding die for an ophthalmic lens and a method for molding an ophthalmic lens using the same, and in particular, without using a sharp projection for forming a lens edge portion, a contact lens or an intraocular lens. The present invention relates to a mold capable of advantageously molding such an ophthalmic lens and a method for advantageously molding an ophthalmic lens using the same.

  Conventionally, a combination of a first mold and a second mold, such as a combination of a male mold and a female mold or a combination of an upper mold and a lower mold, and a contact lens or an eye between those molds. Using a mold for an ophthalmic lens such that a predetermined mold cavity having a shape giving an ophthalmic lens such as an inner lens is formed, a predetermined lens material is molded in the mold cavity of such a mold. Various proposals have been made on techniques for obtaining a desired ophthalmic lens.

  Then, in order to combine the two molds to form a predetermined molding cavity, the peripheral portions of the two molds to be abutted are contact portions, and define the outer shape of the edge portion of the ophthalmic lens to be molded. In addition, it is configured so that it can also function as a seal portion of the lens material filled in the molding cavity. However, the structure of the contact portion between these two molds is a line contact type and a surface contact type. The system is considered. That is, in the line contact method, a configuration is employed in which a sharp cavity provided on one of the two molds is brought into line contact with the other mold to form a molding cavity, and in the surface contact method, A common surface is provided on both of the two dies, and the common molding surface is brought into surface contact with the two dies so as to form a desired molding cavity.

  Specifically, as a structure of the line contact method, for example, a structure as disclosed in JP-A-6-208090 (Patent Document 1) can be mentioned. A knife edge for forming line contact with another mold surface is formed, and such a knife edge press contact with another mold surface forms a molding cavity which is isolated from the outside, and is formed in the molding cavity. However, in order to form a projection as a sharp knife edge in such a mold, an advanced (skilled) technique is required. In general, there is a problem that the non-defective rate of the mold itself is low when the mold is manufactured by the employed molding, and the shape of such a sharp projection is incomplete. In some cases, is inherent problem that can not be obtained edge shape of the correct lens.

  As a structure of the surface contact method, for example, in Japanese Patent Application Laid-Open No. 55-151618 (Patent Document 2), a flat bonding surface having a predetermined width is formed around a portion where a male and female mold cavity is formed. (Shared surfaces) are provided, and the mating surfaces of the male and female molds are brought together so that the respective joining surfaces are abutted to form a desired molding cavity between the male and female dies. On the other hand, such a structure is adopted that a seal is provided between the molding cavity and the outside, but in such a structure, the joining surfaces of the male and female molds are slightly displaced. In this case, the shape of the molding cavity changes, and the lens shape of the ophthalmic lens to be molded is deformed. In particular, the peripheral portion of the lens is deformed, and it is difficult to achieve the desired lens edge shape. Question There is.

  Further, Japanese Patent Application Laid-Open Nos. 5-337957 (Patent Document 3) and JP-A-6-170858 (Patent Document 4) disclose, as another structure in such a surface contact method, a male member for forming a contact lens mold. The mold and the female mold are constituted by the same mold, and one of the molds has both concave and convex surfaces, and has a flat surface of a predetermined width at a mold surface portion located on the outer peripheral portion of the molding cavity. By providing a contact surface, when the male mold and the female mold are matched, the structure is such that the flat surfaces of each mold are in contact with each other, and the molding cavity is partitioned from the outside, In a mold having such a structure, a large clamping force is required when the surfaces are brought into contact with each other, and the mold may be deformed by the action of such a clamping force, Therefore, the change in sphericity Other changes in and cavity volume results in a problem that is caused, were those parallelism of contact surfaces for contacting the male and female are inherent problems such as required.

JP-A-6-208090 JP-A-55-151618 JP-A-5-337957 JP-A-6-170858

  Here, the present invention has been made in view of such circumstances, and a problem to be solved is to form a sharp protrusion or a large mold clamping to form a lens edge portion of an ophthalmic lens. An object of the present invention is to provide a mold for an ophthalmic lens capable of accurately and easily molding an edge portion of a good ophthalmic lens without requiring force. Another object of the present invention is to provide a method for forming a desired ophthalmic lens by using the method.

  Then, in order to solve the above-mentioned problems, the present invention combines a first mold and a second mold, and a molding cavity having a shape that gives a target ophthalmic lens is provided between the molds. In a mold for an ophthalmic lens to be formed, one of the first and second molds is a lens forming portion inside a contact point of the two molds and a mold outside the contact point. A peripheral portion, and the molding cavity is formed between the lens forming portion and the other mold, and at least a portion of the lens forming portion near the contact is concave with respect to the other mold. A mold for an ophthalmic lens, characterized in that at least a portion of the mold peripheral portion near the contact point is a convex curved surface that is convex with respect to the other mold while being a concave lens forming surface. , Its gist.

  As described above, in the mold for an ophthalmic lens according to the present invention, one of the first and second molds constituting the mold has at least the lens forming portion inside the contact point of the two molds. A portion near the contact is a concave lens forming surface that is concave with respect to the other mold, and at least a portion near the contact at a peripheral portion of the mold outside the contact is convex with respect to the other mold. By having a convex curved surface, it is possible to effectively define the edge portion of the molding cavity for providing the objective ophthalmic lens without the need for sharp projections while using the line contact method. The seal between the first and second molds can also be advantageously achieved without requiring a large clamping force, whereby the edge portion of the ophthalmic lens can be formed accurately and easily. I was able to do it A.

  According to one preferred embodiment of the mold for an ophthalmic lens according to the present invention as described above, a tangent at the contact to the convex curved surface and a tangent at the contact to the mold surface of the other mold. And the convex curved surface has a radius of curvature of 0.06 mm to 1 mm at the contact point.

  Further, in the mold for an ophthalmic lens according to the present invention, the first and second molds constituting the mold are generally constituted by a male mold and a female mold, and among the male mold and the female mold, On the other hand, the lens forming portion having the concave lens forming surface and the mold peripheral portion having the convex curved surface are formed.

  According to another preferred embodiment of the mold for an ophthalmic lens according to the present invention, at least one of the first and second molds is formed of a material capable of transmitting light.

  In the mold for an ophthalmic lens according to the present invention, advantageously, the first mold is constituted by a male mold having a mold surface having a convex curved surface shape, The second mold is constituted by a female mold having a mold surface which is a curved surface having a concave shape, and the female mold has the lens forming portion and the mold peripheral portion, and the lens mold is formed. The concave lens forming surface is formed at an outer peripheral portion providing at least a lens edge portion of the portion, and the convex curved surface is further formed at the peripheral portion of the mold, and the concave lens forming surface and the convex curved surface form a convex. A convex portion is formed, and the convex portion is adapted to abut against the male mold surface.

  Further, in one preferred embodiment of the mold for an ophthalmic lens according to the present invention, a moldable cavity is filled with a polymerizable lens material, and the polymerization of such a material makes molding of the ophthalmic lens advantageous. It will be.

  In addition, as an ophthalmic lens molded by such a mold according to the present invention, a contact lens is advantageously targeted.

  Further, the present invention provides a method of molding an objective ophthalmic lens using the above-described mold for an ophthalmic lens, by preparing four of the molds, and forming the molds at four corners of a rectangular shape. Each of the molding dies is placed in such a manner that the pressing plate is placed on the four molding dies, and the clamping force is applied to each of the molding dies through the pressing plate. The gist of the present invention is also a method for molding an ophthalmic lens, which comprises molding a lens material filled in a molding cavity to obtain a desired ophthalmic lens.

  As described above, in the mold for the ophthalmic lens according to the present invention, the two molds constituting the mold are aligned by the line contact method, while using the sharp projection as in the related art. Since the two molds are not brought into contact with each other, the mold can be easily manufactured and the edge shape of the objective ophthalmic lens can be accurately realized, thereby making the ophthalmic lens easy and inexpensive. In addition, it is possible to manufacture the ophthalmic lens easily, and from this point, the molding operation of the ophthalmic lens is facilitated. In other words, the generation of defective products due to the deformation of the mold and the change in the cavity volume can be effectively suppressed or prevented. Further, according to the method for molding an ophthalmic lens according to the present invention, a uniform mold clamping force can be advantageously exerted while the advantages of the above-described mold are enjoyed as they are, and a desired ophthalmic lens can be advantageously obtained. It becomes possible.

  Hereinafter, the configuration of the present invention will be more specifically clarified with reference to the drawings.

  First, in an example of a mold for an ophthalmic lens according to the present invention shown in FIGS. 1A and 1B, reference numeral 2 denotes a male mold, 4 denotes a female mold, and the male mold 2 and the female mold 4 As is well known, a molding die is formed by combining the two molds 2 and 4 to form a desired ophthalmic lens (here, an objective lens). , A contact lens).

  According to the present invention, among the male mold 2 and the female mold 4, the mold surface of the female mold 4 facing the male mold 2 has a lens forming portion having a predetermined concave lens forming surface, and a convex curved shape. And the peripheral part of the mold having a surface. That is, the male mold 2 and the female mold 4 are brought into contact at the point A by their mold matching (combination), sealed from the outside, and a predetermined molding cavity 6 is formed between the molds. However, such a contact point: A is provided between the contact points A to provide a molding surface on the side of the molding cavity 6 of the female mold 4. At least a portion near the contact point of the lens forming portion inside the A point. Is formed as a concave lens forming surface 8 that is concave with respect to the male mold 2, and at least a portion near the contact at the periphery of the mold outside the contact A is convex with respect to the male mold 2. On the other hand, the mold surface 12 facing the female mold 4 of the male mold 2 is formed on the female mold 4 in the same manner as in the related art in order to form a target ophthalmic lens. Thus, it has a convex curved surface shape. Therefore, the boundary between the concave lens forming surface 8 and the convex curved surface 10 of the female mold 4 is brought into contact with the mold surface 12 of the male mold 2 to form a contact point A. It becomes.

In short, as shown in FIG. 2, in a vertical section passing through the central axis of the male mold 2 and the female mold 4, the mold surface 12 near the contact point A of the male mold 2 has the same curvature as the conventional one at the contact point A. The mold surface facing the male mold 2 of the female mold 4 is a convex curved surface having a radius: R _1. The convex curved surface 10 which is a concave lens forming surface 8 which provides at least a lens edge portion of the ophthalmic lens, and which constitutes at least a portion near the contact of the mold peripheral portion outside the contact A. contact: in a, a predetermined curvature radius is what is configured to have a R _2. Further, the contact A of the male 2: and L _1, female 4 contacts: tangent to the mold surface 12 of the R _1: curvature at a radius of curvature in the A radius of contact with respect to the convex curved surface 10 of the R ₂ tangent: and L ₂ is a predetermined angle: and is configured so as to form a theta.

  Therefore, in a molding die composed of a combination of the male die 2 and the female die 4 having such a configuration, as is apparent from the enlarged view of FIG. In a convex portion formed by the surface 8 and the convex curved surface 10, the male mold 2 is brought into contact with the male mold 2, and the contact point thereof is formed inside the area A from which a given ophthalmic lens is formed. The cavity 6 is defined and can be effectively sealed from the outside. Therefore, since it is not necessary to form a sharp projection as in the conventional case, the male mold 2 and the female mold 4 are not required. In particular, the molding is facilitated, and the yield of the molds can be effectively increased. In addition, the concave lens forming surface 8 and the convex curved surface 10 formed on the female mold 4 are provided. Convex portions can also be easily formed and become imperfect From where not, the ophthalmic lens to be molded in the molding cavity 6 is of a fact that can be advantageously impart accurate lens edge shape.

  Further, there, the convex portion of the female mold 4 provided by such a concave lens forming surface 8 and the convex curved surface 10 is brought into contact with the male mold 2 and, at the contact point A, a line contact method is used. In this case, a structure in which the sealing of the molding cavity 6 is realized is adopted, so that a large clamping force is not required unlike a conventional surface contact type molding die. The deformation of the mold caused by the deformation causes no change in the volume of the molding cavity or the change in the sphericity of the ophthalmic lens to be molded. There is no problem such as deformation of the lens, especially deformation of the peripheral part of the lens, and furthermore, it is not necessary to obtain the parallelism of the contact surface for bringing the male mold and the female mold into contact with each other. Male type 2 or female type Production becomes very easy.

Incidentally, in the mold which consist of a combination of the male 2 and female 4 above which exhibit such characteristics, the male mold 2 of the curvature radius: Contact give R _1: and the shape of the A near the mold surface 12, The contact point of the female mold 4: the shape of the concave lens forming surface 8 in the vicinity of A is appropriately determined according to the desired lens edge shape of the ophthalmic lens molded in the molding cavity 6. , The contact of the female mold 4: the shape of the convex curved surface 10 in the vicinity of A, more specifically, the radius of curvature of the contact: A at R: R _2, and the tangent of the male mold 2 at such a contact: A: L ₁ to the female mold 4 The tangent of L: the angle formed by L ₂ : θ is appropriately selected. However, in order to sufficiently exhibit the above-mentioned characteristics, the radius of curvature at the contact point A of the convex curved surface: A is R. the _{2, 0.06mm~1mm,} especially 0.08mm~0.5 is preferably a m, further, the two tangents: L ₁ and angle formed with L _2: The theta, 1 ° to 9 °, it is desirably particularly 3 ° to 7-°, the present inventors As a result of these detailed experiments, it is clear.

  In addition, as the material of the male mold 2 and the female mold 4 constituting such a molding die, known materials such as resin, metal, and glass are appropriately selected. By the usual resin molding technique, a thermoplastic resin material is advantageously used because a target mold can be easily manufactured.For example, polyethylene, polyolefin such as polypropylene, polystyrene, polycarbonate, polymethyl methacrylate, ethylene -Synthetic resins such as vinyl alcohol copolymers, polyacetals, polyamides, polyesters, and polysulfones, and particularly polyolefins such as polypropylene, are advantageously used to obtain a resin having a desired shape.

  By the way, in the molding die of the above example, a convex portion composed of a concave lens forming surface 8 and a convex curved surface 10 was formed on the mold surface of the female die 4 facing the male die 2. It is also possible to provide such a convex portion on the male mold 2 side, an example of which is shown in FIGS. 3 (a) and 3 (b).

  That is, in (a) and (b) of FIG. 3, the mold surface of the male mold 2 forming the mold in cooperation with the female mold 4 faces the female mold 4 at the time of mold matching. With the contact: A interposed therebetween, at least a portion near the contact of the lens forming portion inside such a contact: A is formed as a concave lens forming surface 14 that is concave with respect to the female mold 4. At least a portion near the contact point of the peripheral portion of the mold outside of A is formed as a convex curved surface 16 that is convex with respect to the female mold 4, and the concave lens forming surface 14 and the convex curved surface 16 The contact portion A is formed by contacting the convex portion provided as described above with the mold surface 18 of the female mold 4. The mold surface 18 of the female mold 4 facing the male mold 2 is formed such that a molding cavity 6 having a shape for providing a predetermined ophthalmic lens can be formed between the mold face 18 and the male mold 2 facing the mold surface (14). , Is a curved surface (lens forming surface) having a concave shape with respect to the male mold 2.

Accordingly, in a mold made of such male mold 2 and female mold 4 which, female 4 contacts: curvature at A radius tangent contact with the R _1: and L _1, male 2 contacts: curvature at A radius: A predetermined angle θ is formed between the tangent line L ₂ tangent to the convex curved surface 16 of R ₂ , thereby forming the concave lens forming surface 14 of the male mold 2 and the convex curved surface. The convexity provided at the surface 16 can be effectively abutted against the mold surface 18 of the female mold 4 at the contact point: A, so that an effective seal to the outside of the molding cavity 6 is realized. You get it.

  When a target ophthalmic lens such as a contact lens or an intraocular lens is manufactured by using a mold including the male mold 2 and the female mold 4 having such a structure, for example, as shown in FIG. A molding die composed of the male mold 2 and the female mold 4 which are matched so as to be mounted on a glass bottom plate 20 which provides a flat surface at a flange portion of the female mold 4, is mounted on a cylindrical resin support 22. On the other hand, a transparent glass holding plate 24 is placed on the upper surface of the male mold 2, and the weight of the holding plate 25 itself and, if necessary, a weight or the like are used. A predetermined clamping force is applied between the male mold 2 and the female mold 4 by the applied pressing force. Here, between the rectangular bottom plate 20 and the holding plate 24, the forming dies composed of the male die 2 and the female die 4 are respectively arranged at the four corners of such a rectangular shape (in the drawing, one of them). One is shown), so that the clamping force from the holding plate 24 is applied uniformly to each of the molding dies at the four corners.

  In such an arrangement of the molding dies, a predetermined lens material 26 is filled in a molding cavity 6 formed between the male mold 2 and the female mold 4 to form a desired ophthalmic lens. Is performed.

  In the operation of molding an ophthalmic lens using such a mold, various known lens materials are used. For example, a polymer or a monomer may be used. In the present invention, a polymerizable lens material (monomer liquid) similar to the conventional one, which gives a polymer constituting an intended ophthalmic lens, is advantageously used. In general, such a monomer liquid is one in which one or more kinds of conventionally used radically polymerizable compounds are blended, and one which is composed of a macromer or a prepolymer. However, there is no problem. Further, such a compound contains at least one vinyl group, allyl group, acryl group or methacryl group in a molecule, and is usually used as a raw material for hard contact lenses, soft contact lenses, and further, intraocular lenses. The substance used. Specifically, (meth) such as alkyl (meth) acrylate, siloxanyl (meth) acrylate, fluoroalkyl (meth) acrylate, hydroxyacryl (meth) acrylate, polyethylene glycol (meth) acrylate, and polyhydric alcohol (meth) acrylate Acrylic esters, styrene derivatives, N-vinyl lactam, etc. may be mentioned. If necessary, polyfunctional monomers such as ethylene glycol di (meth) acrylate and diethylene glycol di (meth) acrylate may be blended as a crosslinking agent. Further, necessary polymerization initiators, for example, a thermal polymerization initiator, a photopolymerization initiator and the like, and additives such as a sensitizer are appropriately blended to prepare a monomer liquid.

  Further, the polymerization of the polymerizable lens material (26) composed of such a monomer solution is performed, for example, according to a normal thermal polymerization method or a normal photopolymerization method. Is adopted, it is necessary to irradiate the polymerizable material (26) with light such as UV light. Therefore, at least one of the male mold 2 and the female mold 4 constituting the mold transmits light. The bottom plate 20 and / or the holding plate 24 in FIG. 5 corresponding to the male mold 2 and the female mold 4 are also formed of a material having high transparency. The polymerizable material (26) is formed of a material such as glass, and the polymerization of the polymerizable material (26) is performed by light guided through the material.

  In any case, the molding operation of the lens material 26 such as the molding by the polymerization is performed in a state where the male mold 2 and the female mold 4 are matched as shown in FIG. At that time, since the mold surface providing the contact points A of the molds has the structure according to the present invention, the sealing at such contact points A can be effectively performed, and the male mold 2 and the female mold are provided. 4 effectively prevents the leakage of the lens material 26 filled in the molding cavity (6) formed between the lens and the lens material 26 to the outside, and enables effective molding of the objective ophthalmic lens. An ophthalmic lens having an excellent lens edge shape can be obtained with less burrs and a good yield.

  In the production of the ophthalmic lens mold according to the present invention and the ophthalmic lens using the same, not only the structure and method described above, but also to the knowledge of those skilled in the art, as long as they do not depart from the gist of the present invention. It should be understood that the present invention can be implemented in a form in which various changes, modifications, improvements, and the like are made.

  For example, the shape of the molding surface (mold surface) defining the molding cavity 6 of the male mold 2 and the female mold 4 can be appropriately changed according to the shape of the objective ophthalmic lens. In addition to changing the radius of curvature of the central part and the peripheral part to two steps, further changing the radius of curvature to three or more steps, or comprising an elliptical surface or a curved surface of one curvature radius However, it does not matter at all, and when molding an ophthalmic lens having a convex lens shape, according to the present invention, not a combination of a male mold and a female mold, but a combination of two molds each having a concave molding surface. It is also possible to configure a mold.

  Hereinafter, typical examples of the present invention will be shown to clarify the present invention more specifically. However, the present invention is not limited by the description of such examples. That goes without saying.

First, a mold composed of the male mold 2 and the female mold 4 shown in FIGS. 1 and 2 was prepared using polypropylene as a material according to a usual molding technique. The radius of the base curve optical surface given by the mold surface 12 of the male mold 2 is 7 mm, and the radius of the front curve optical surface given by the lens forming portion including the concave lens forming surface 8 of the female mold 4 is 8 mm, and the outer diameter of the lens was 13.5 mm. Also, the contact of the convex curved surface 10 of the female 4: curvature at A radius while the R ₂ and 0.2 mm, such contacts: tangent of the male 2 in A: L ₁ and a female 4 tangent: L Angle made with ₂ : θ was set to 5 °.

  On the other hand, a contact containing 100 parts by weight of 2-hydroxyethyl methacrylate, 0.2 parts by weight of a photoreactive polymerization initiator, and 0.2 parts by weight of ethylene glycol dimethacrylate as a crosslinking component as the polymerizable lens material 26. A lens formulation was prepared.

Next, using the contact lens compounding solution, it is accommodated in the concave lens forming portion of the prepared female mold 4 of the mold, and the male mold 2 is further superimposed thereon, and the male mold 2 After filling in the molding cavity 6 formed between the mold and the female mold 4, in the form shown in FIG. 5, the mold clamping force is 0.5 N, the main wavelength is 360 nm, and the irradiation intensity is about 0.1 mW. / Cm ² for 1 hour from the upper part of the mold, photopolymerization was performed, and the desired contact lens was molded.

  Thereafter, the contact lens (polymerized product) molded by the polymerization is swollen in distilled water to be detached from the molds (2, 4), and further subjected to hydration treatment in a physiological saline solution. I got a contact lens. The contact lens thus obtained had almost no burrs on the outer peripheral portion, and the non-defective rate was 90%.

Also, the contact of the convex curved surface 10 of the female die 4: curvature at A radius and R _2, wherein the tangent line: L ₁ and tangential: an angle formed between the L _2: a theta, as shown in Table 1, various Using the different female mold 4, the contact lens was molded in the same manner as above, and the product ratio of each obtained contact lens without burrs, that is, the non-defective product ratio was obtained. The results are shown in Table 1 below. Also shown.

It is explanatory drawing in the vertical cross section which passes through the center axis of a male type | mold and a female type | mold which shows an example of the shaping | molding die of the ophthalmic lens according to this invention, (a) shows the state which matched the male type and the female type. It is a figure, (b) is an enlarged partial explanatory view near the type | mold contact part in the type | mold matching state of such a male type and a female type. It is a schematic diagram explaining the shape of the male mold surface and the female mold surface in the state shown to Fig.1 (b). It is explanatory drawing in the vertical cross section which passes through the central axis of a male type | mold and a female type | mold which shows another example of the shaping | molding die of the ophthalmic lens according to this invention, (a) and (b) are each (() of FIG. It is a figure corresponding to a) and (b). Fig. 3 is a schematic view corresponding to Fig. 2, according to another example of the mold for the ophthalmic lens according to the present invention. FIG. 2 is an explanatory view in a vertical section passing through the central axes of a male mold and a female mold, showing a form of molding a contact lens using the mold for an ophthalmic lens according to the present invention shown in FIG. 1.

Explanation of reference numerals

2 Male mold 4 Female mold 6 Mold cavity 8,14 Concave lens forming surface 10,16 Convex curved surface 12,18 Mold surface 20 Bottom plate 22 Abutment 24 Press plate 26 Lens material

Claims (8)

Combining the first mold and the second mold, between the molds, into a mold for an ophthalmic lens such that a molding cavity having a shape that gives a target ophthalmic lens is formed,
One of the first and second molds has a lens forming portion inside the contact point of the two molds and a mold peripheral portion outside the contact point, and the lens forming portion and the other of the other. The molding cavity is formed between the mold and the mold, and at least a portion of the lens forming portion near the contact point is a concave lens forming surface that is concave with respect to the other mold, while the peripheral portion of the mold is formed. A molding die for an ophthalmic lens, wherein at least a portion near the contact point has a convex curved surface that is convex with respect to the other die.   The angle between the tangent at the contact point to the convex curved surface and the tangent at the contact point to the mold surface of the other mold is 1 ° to 9 °, and the convex curved surface is 0 ° at the contact. The mold for an ophthalmic lens according to claim 1, which has a radius of curvature of 0.06 mm to 1 mm.   3. The mold for an ophthalmic lens according to claim 1, wherein the first and second molds are composed of a male mold and a female mold.   The mold for an ophthalmic lens according to any one of claims 1 to 3, wherein at least one of the first and second molds is formed of a material capable of transmitting light.   While the first mold is constituted by a male mold having a mold surface having a convex curved surface shape, the second mold is constituted by a female mold having a mold surface having a concave curved surface. And the female mold has the lens forming portion and the mold peripheral portion, and the concave lens forming surface is formed at an outer peripheral portion of the lens forming portion that provides at least a lens edge portion. Further, the convex curved surface is formed around the mold, a convex portion is formed by the concave lens forming surface and the convex curved surface, and the male mold surface is formed on the convex portion. The mold for an ophthalmic lens according to any one of claims 1 to 4, wherein the mold is adapted to be abutted.   6. The mold for an ophthalmic lens according to claim 1, wherein the mold cavity is filled with a polymerizable lens material, and the molding of the ophthalmic lens is performed by polymerization of the material.   The mold for an ophthalmic lens according to any one of claims 1 to 6, wherein the ophthalmic lens is a contact lens. Using the mold for an ophthalmic lens according to any one of claims 1 to 7, a method for molding a target ophthalmic lens,
Four molds are prepared, the molds are arranged so as to be located at four corners of a rectangular shape, and a press plate is placed on the four molds, and clamped through the press plates. An ophthalmic lens characterized in that, under a state in which a force is applied to each mold, a lens material filled in a molding cavity of each mold is formed to obtain a target ophthalmic lens. Molding method.

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