Lens meter

Details Lens meter Lens meter

2005-12-06

2005-12-06

Smith, Zandra V. (Department: 2877)

Optics: measuring and testing

Lens or reflective image former testing

Reexamination Certificate

active

06972837

ABSTRACT:
A lens meter for measuring optical characteristics of a lens, which is capable of measuring a progressive lens easily and an aspherical lens accurately. The lens meter is provided with a lens rest having an aperture, for placing a lens thereon, a measurement optical system having a light source which projects a measurement light bundle onto the lens placed on the lens rest and a photodetector which receives the measurement light bundle transmitted through the lens, for forming a plurality of different measuring positions inside the aperture, calculation means for obtaining optical characteristics at each of the measuring positions based on an output from the photodetector, comparison means for comparing the optical characteristics obtained at the measuring positions, and guiding means for guiding a predetermined one of the measuring positions to at least one of a near viewing section and a far viewing section of a progressive lens based on a result of the comparison.

REFERENCES:
patent: 3880525 (1975-04-01), Johnson
patent: 5303022 (1994-04-01), Humphrey et al.
patent: 5682234 (1997-10-01), Kajino
patent: 5734465 (1998-03-01), Kajino
patent: 6061123 (2000-05-01), Ikezawa et al.
patent: A 2001-124662 (2001-05-01), None

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