Lens surface grinding method and apparatus
Abstract
Abstract A METHOD AND APPARATUS FOR GRINDING A COMPLEX OPTICAL SURFACE ON A LENS ELEMENT TO PROVIDE BETWEEN THE LENS ELEMENT SURFACE AND A REFERENCE SURFACE, A LENS THICKNESS VARIATION DEFINED BY THE FUNCTION Z (X,Y) WHERE X AND Y FORM A COORDINATE SYSTEM IN WHICH THE FUNCTION Z (X,Y) DEFINES THE LENS ELEMENT THICKNESS AT ANY POINT (XN,YM) THE FUNCTION Z (X,Y) ROTATABLE TO A COORDINATE SYSTEM OF COORDINATES X'' AND Y'' IN WHICH THE FUNCTION Z(X'',Y'')=F(X'')+F(Y'') A GRINDING TOOL HAVING A BEARING SURFACES DEFINED BY THE FUNCTION F IS SCRAPED ACROSS THE LENS ELEMENT SURFACE IN THE PRESENCE OF AN ABRASIVE, IN THE DIRECTION OF THE COORDINATES OF THE X''-Y'' COORDINATE SYSTEM SUCCESSIVELY, WITH RESILIENT PRESSURE APPLIED TO THE TOOL IN THE DIRECTION OF THE LENS ELEMENT SURFACE.
Inventors
- 👤 William E Humphrey
Bibliographic Details
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