Title:
Manufacturing equipment and manufacturing method for spectacle lenses
Document Type and Number:
Japanese Patent JP6294990
Kind Code:
B2
Abstract:
Defining a reference lens common to the left and the right; calculating object side angles of view of light rays respectively passing through predetermined sample points on the reference lens; by calculating light rays whose object side angles of view for a prescribed lens are equal to the calculated object side angles of view, obtaining light ray passing positions on the prescribed lens through which light rays having the same objet side angles of view as those of the light rays corresponding to the respective sample points on the reference lens pass; calculating a ratio between a distance from an intersection between a visual line in a front view and the reference lens to the sample point on the reference lens and a distance from an intersection between a visual line in a front view and the prescribed lens to the light ray passing position on the prescribed lens; and correcting, for each of the left and the right, a curvature distribution of the prescribed lens by correcting, based on the ratio, curvature at each of the light ray passing positions on the prescribed lens corresponding to the respective object side angles of view.
More Like This:
Inventors:
Kazuma Kozu
Application Number:
JP2017079396A
Publication Date:
March 14, 2018
Filing Date:
April 13, 2017
Export Citation:
Assignee:
HOYA CORPORATION
International Classes:
G02C7/06; G02C13/00
Domestic Patent References:
| JP2009072528A1 | ||||
| JP2012173674A | ||||
| JP2011203705A | ||||
| JP2012215639A | ||||
| JP2012173594A | ||||
| JP2006350381A | ||||
| JP2013171134A | ||||
| JP2012173596A |
Foreign References:
| WO2009072528A1 | ||||
| US20120218510 | ||||
| US20110211159 | ||||
| WO2005066696A1 | ||||
| WO2012115258A1 | ||||
| US20130148078 |
Attorney, Agent or Firm:
Shuhei Matsuoka