Lens molding die and a producing method therefor
AssigneePENTAX Corporation
InventorToru Chiba
Life of this patent
Estimating the term…
Abstract
A lens molding die for producing a lens, which comprises a base member made of a hard material and having one surface of a predetermined shape; and a resin-molded layer formed on the one surface of the base member and having a surface shape corresponding to a predetemined shape of a lens to be molded. The resin-molded surface is to be made of a resin material which is inactive with a material which is to be molded by the lens molding die. The resin-molded layer is formed by introducing the material into the space formed between the one surface of the base member and a transfer surface formed on a transfer die correspondingly to the surface of a lens to be produced to be cured by heat or ultraviolet rays.
Claims11
A lens molding assembly which comprises:
- a lens molding die comprising:
- a base member made of a hard material and having one surface of a predetermined shape;
- a resin-molded surface layer formed on said one surface of the base member and having a surface shape corresponding to a predetermined shape of one surface of a lens to be produced;
- and
- a lower cylindrical holder configured to surround and fixedly hold said base member;
- an upper member having a lower surface configured to contact the surface of said resin-molded surface layer;
- an upper cylindrical holder configured to surround and fixedly hold said upper member;
- and
- a ring-shaped positioning member configured to be coaxially sandwiched between said lower and upper cylindrical holders, wherein:
- said surface shape of said resin-molded surface layer is uninterrupted and conforms to said predetermined shape of said base member;
- said resin-molded surface layer is inactive with a material to be molded by said lens molding die;
- a curvature of said surface shape of said resin-molded surface layer is different from a curvature of said predetermined shape of said base member;
- and
- a thickness of said resin-molded surface layer is less than a thickness of said base member.
A lens molding assembly comprising:
- a lens molding die comprising:
- a base member having a surface configuration;
- a resin-molded surface layer on said surface of said base member and having a surface layer surface configuration corresponding to a shape of a surface of a lens to be produced;
- and
- a lower cylindrical holder configured to surround and fixedly hold said base member;
- an upper member having a lower surface configured to contact the surface of said resin-molded surface layer;
- an upper cylindrical holder configured to surround and fixedly hold said upper member;
- and
- a ring-shaped positioning member configured to be coaxially sandwiched between said lower and upper cylindrical holders, wherein:
- said surface layer surface configuration is uninterrupted and conforms to said base member surface configuration;
- a curvature of said surface layer surface configuration does not correspond to a curvature of said base member surface configuration;
- and
- a thickness of said resin-molded surface layer is less than a thickness of said base member.
A lens molding die assembly comprising:
- a lens molding die comprising:
- a base member having a spherical surface;
- a resin-molded surface layer on said spherical surface and having an aspherical surface configuration corresponding to a shape of a surface of a lens to be produced;
- and
- a lower cylindrical holder configured to surround and securely hold said base member;
- an upper member having a lower surface configured to contact the surface of said resin-molded surface layer;
- an upper cylindrical holder configured to surround and fixedly hold said upper member;
- and
- a ring-shaped positioning member configured to be coaxially sandwiched between said lower and upper cylindrical holders, wherein:
- said aspherical surface of said resin-molded surface layer is uninterrupted and conforms to said spherical surface of said base member;
- a thickness of said resin-molded surface layer is configured to vary only in accordance with the aspheric component of said resin-molded surface layer;
- and
- a thickness of said resin-molded surface layer is less than a thickness of said base member.
Dependencies are inferred from the claim text.