Title:
MOLD FOR CAST MOLDING OF RESIN LENS FOR GLASSES
Document Type and Number:
Japanese Patent JP3705504
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To keep the sectional form of a gasket constant to a mold used for the precision molding of the concave surface of a plastic lens for glasses to an aspheric surface such as a hyperboloidal surface, elliposoidal surface or the like and/or a toroidal surface.
SOLUTION: At the peripheral part of a mold 1, 2 for molding a concave surface, a surface A, against which a gasket 3 is abutted, is so constituted as to lie in the same plane and, by changing the height (h) of the surface B, the height H of a portion serving as the roll of the spacer of the gasket 3 is made to be constant. Further, by providing at least two adjoining surfaces to the surface A, the airtightness between the gasket 3 and the mold 1, 2 is improved.
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Inventors:
Kazunori Kagei
Application Number:
JP27550895A
Publication Date:
October 12, 2005
Filing Date:
October 24, 1995
Export Citation:
Assignee:
Asahi Optical Co., Ltd.
International Classes:
B29C33/42; B29C33/00; B29C39/32; B29D11/00; G02B3/02; B29L11/00; (IPC1-7): B29C39/32; B29C33/42
Domestic Patent References:
| JP6043601U | ||||
| JP6300949A | ||||
| JP3231814A | ||||
| JP6043601U |
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