Title:
PREPARATION OF SPECTACLE LENS
Document Type and Number:
Japanese Patent JPS5342049
Kind Code:
A
Abstract:
PURPOSE: To improve impact resistance of lens by polishing in cross-sectional shapes of circular arc with radius of 200 cm or less at a part or whole of the peripheral of the concave surface portion of spectable lens.
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Inventors:
KAWACHI AKIHIKO
Application Number:
JP11614076A
Publication Date:
April 17, 1978
Filing Date:
September 28, 1976
Export Citation:
Assignee:
SUWA SEIKOSHA KK
International Classes:
G02C7/02; (IPC1-7): G02C7/02