US 7,083,498 B2 · Method for deciding a bevel curve, method for determining the locus of a bevel, method for processing a lens and apparatus for processing a lens

Abstract

When a forming a bevel on a lens, the value of the bevel curve is calculated based on the value of the curve of the concave face, a reference axis of the bevel curve is determined to be in the same direction as the curvature of the concave face, a reference position on the peripheral edge of the lens in the first portion having the minimum thickness is determined based on the thickness of the first portion, a correction for the initial reference axis of the bevel curve is obtained, an angle of inclination from the direction of the initial reference axis of the bevel curve is obtained based on the correction and the locus of the bevel is determined based on the value of the bevel curve, the reference position and the angle of inclination.

Claims5

Dependent claims

A method for determining a bevel curve in a high power plus lens, comprising the steps of:

inputting a value of a curve of a concave face of the high power plus lens;
and calculating a value of the bevel curve based on the inputted value of the curve of the concave face of the high power plus lens, wherein the value of the bevel curve is calculated as follows:
K1=(average value of the curve at the concave face)×(adjusting coefficient e),
wherein K1 represents the value of the bevel curve, and e represents a number of 1 or greater.

1 more element

A method for determining a locus of a bevel in a high power plus lens comprising the steps of:

calculating a value of a bevel curve based on a value of the curve of a concave face of the high power plus lens;
determining a location of a reference position of the bevel on a peripheral edge of the high power plus lens in a first portion having a minimum thickness of the high power plus lens, wherein the location of the reference position is based on a thickness of the first portion having the minimum thickness;
calculating a correction value of a curve based on a ratio of the value of a first curve of the concave face of the high power plus lens to a value of a second curve of a convex face of the high power plus lens, or based on the value of the first curve of a convex face of the high power plus lens;
and,
determining the locus of the bevel, which has a value of a corrected curve, by adding the correction value of a curve to the value of the bevel curve that passes through the reference position of the bevel.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

11/170,094Filed 30 Jun 2005 · division

Priority

JP 2002-1052298 Apr 2002

Published

US 2005/0239373 A127 Oct 2005

Granted

1 Aug 2006

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

B24B 1/00
Processes of grinding or polishing
B24B 9/148
Of optical work, e.g. lenses, prisms: electrically, e.g. numerically, controlled
B24B 19/03
For grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements: for grinding grooves in glass workpieces, e.g. decorative…
B24B 47/225
Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation: for bevelling optical work, e.g.…

Method for deciding a bevel curve, method for determining the locus of a bevel, method for processing a lens and apparatus for processing a lens

Life of this patent

Method for deciding a bevel curve, method for determining the locus of a bevel, method for processing a lens and apparatus for processing a lens

Life of this patent

Abstract

Claims5