EP 0379426 A2 19900725 - Method for grinding a lens and apparatus thereof.
Title (en)
Method for grinding a lens and apparatus thereof.
Title (de)
Verfahren und Vorrichtung zum Schleifen einer Linse.
Title (fr)
Méthode et appareil pour le meulage d'une lentille.
Publication
Application
Priority
JP 946889 A 19890118
Abstract (en)
A lens grinding method of the present invention includes a first step for finding a lens-edge thickness over the entire circumference of a lens-edge vector radius locus of a lens to be cut , a second step for finding a lens-edge vertex position information for dividing the lens-edge into a desired ratio over the entire circumference thereof, and a third step for V-edge edging the lens-edge based on the V-edge vertex position information. Also, a lens grinding apparatus of the present invention includes measuring means (12) for finding a lens-edge thickness over the entire circumference of a lens-edge vector radius locus of a lens to be cut , input means (16) for inputting a desired ratio, calculating means (15) for finding a positional information of a V-edge vertex for dividing the lens-edge at the input ratio over the entire circumference thereof, and controlling means for V-edge edging the lens-edge based on the V-edge vertex positional information. And according to the lens grinding method and the apparatus for carrying out the method, as the lens-edge thickness is measured over the entire circumference of the lens-edge and the movement of the lens in the Z-axis direction is controlled such that the V-edge is formed at a desired ratio over the entire circumference of the lens-edge, the V-edge can be desirably positioned even if a lens having an aspherical refracting surface like a progressive multifocus lens.
IPC 1-7
IPC 8 full level
B24B 9/14 (2006.01); B24B 47/22 (2006.01)
CPC (source: EP)
B24B 9/144 (2013.01); B24B 47/225 (2013.01)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0379426 A2 19900725; EP 0379426 A3 19901219; JP H02190247 A 19900726; JP H07100288 B2 19951101
DOCDB simple family (application)
EP 90400126 A 19900117; JP 946889 A 19890118