Method and apparatus for contactless measurement of the...

Details Method and apparatus for contactless measurement of the... Method and apparatus for contactless measurement of the...

2005-12-08

2009-02-24

Toatley, Jr., Gregory J (Department: 2877)

Optics: measuring and testing

Lens or reflective image former testing

C356S123000

Reexamination Certificate

active

07495753

ABSTRACT:
The invention relates to a method and to apparatus for contactlessly measuring the curvature of an ophthalmic article (1) having a “front” face (1B) that presents said curvature. The method consists in: sequentially emitting at least two light beams (L1, L2) onto said front face, these two light beams being offset by a certain angle (α) and converging substantially onto said front face, one of said emitted light beams (L1) being substantially centered on said front face and being substantially normal to said front face; analyzing the wave fronts of the resulting reflected beams (L′1, L′2) in order to determine their respective focuses (F1, F2) therefrom; and deducing the radius of curvature of said face; said operations being performed in such a manner that said emitted beams are substantially not reflected by the rear face of said article.

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Sriram et al., “Curvature and focal length measurements using compensation of a collimated beam,” Optics & Laser Technology, vol. 23, Issue 4, Aug. 1991, abstract.

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