Method and apparatus for locally measuring refractive...

Details Method and apparatus for locally measuring refractive... Method and apparatus for locally measuring refractive...

2005-11-24

2010-06-22

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

C356S124000

Reexamination Certificate

active

07742158

ABSTRACT:
The measurement apparatus includes: a support arranged to receive a lens; lighting element including an optical system for generating a collimated light beam directed towards the lens under measurement installed on the support; detachment elements for detaching light rays from the light beam, for detaching a localized group of at least three non-coplanar light rays grouped together about a measurement axis in a measurement cylinder of section substantially smaller than the section of the lens under measurement; acquisition elements for identifying the deflections imparted by the lens on the detached light rays and for delivering a signal representative of the deflections; and an electronic and computer system programmed to deduce from said deflections the value of the refractive characteristic of the lens at the measurement point.

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patent: 2003/0112426 (2003-06-01), Devie et al.
patent: 2 737 568 (1996-12-01), None

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