Opthalmic lens inspection system

Details Opthalmic lens inspection system Opthalmic lens inspection system

1997-02-06

1998-10-06

Pham, Hoa Q.

Optics: measuring and testing

Lens or reflective image former testing

Optical center, cylinder axis, or prism measuring or...

451240, G01B 1127

Patent

active

058185739

ABSTRACT:
An ophthalmic lens inspection system includes an illumination assembly which generates diffuse light and transmits the diffuse light through an ophthalmic lens disposed in an inspection position, the diffuse light having a diffusivity of between 30.degree. and 50.degree.. An imaging assembly generates a set of signals representing selected portions of the diffuse light transmitted through the ophthalmic lens in the inspection position. A moving mechanism supports the imaging and illumination assemblies for common movement relative to the contact lens, to bring a reference point into alignment with the center of the imaging assembly.

REFERENCES:
patent: 3542476 (1970-11-01), Nord
patent: 3619067 (1971-11-01), Howland
patent: 3904294 (1975-09-01), Gold et al.
patent: 5080482 (1992-01-01), Benz et al.
patent: 5443152 (1995-08-01), Davis
patent: 5500732 (1996-03-01), Ebel et al.
patent: 5528357 (1996-06-01), Davis

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