Title:
PROCESSING METHOD OF LENS MATERIAL BLOCK
Document Type and Number:
Japanese Patent JP2016057324
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a processing method of a lens material block capable of preventing shapes of projection parts of the left and right frames from being different each other even if a part of spectacle frames projects outward from an effective area when a precursor lens set with a C frequency on the rear surface obtained by processing the lens material block and having a minus frequency treated with lenticular processing is further processed to be a spherical lens.SOLUTION: In a direction separating an outer peripheral region of a rear surface of a semi-finished blank from an optical axis, each point existing at an equal distance separated from an optical axis forms a continuous plane whose change of the position in a direction of the optical axis becomes maximum on a plus side in an astigmatism axial direction and becomes a plane moving up and down in a peripheral direction and becomes maximum on a minus side in a direction orthogonal to the astigmatism axis, whereas a rear surface side of the semi-finished blank is set with a S frequency and a C frequency so that an effective region of a precursor lens surrounded by a lenticular processing surface of the region positioned near the backside is formed.SELECTED DRAWING: Figure 3
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Inventors:
FUJII TERUAKI
Application Number:
JP2014180783A
Publication Date:
April 21, 2016
Filing Date:
September 05, 2014
Export Citation:
Assignee:
TOKAI KOGAKU KK
International Classes:
G02C13/00
Domestic Patent References:
| JPS60165932U | 1985-11-02 | |||
| JP2002239882A | 2002-08-28 | |||
| JP2010271702A | 2010-12-02 | |||
| JP2000047144A | 2000-02-18 | |||
| JP2011022292A | 2011-02-03 |
Attorney, Agent or Firm:
Junichi Shibata