Lens measuring apparatus

Details Lens measuring apparatus Lens measuring apparatus

1993-11-03

1996-02-06

Evans, F. L.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356127, G01B 900

Patent

active

054899788

ABSTRACT:
A lens measuring apparatus has a light beam projecting unit for projecting a light beam onto a lens to be examined, a photoelectric detector for detecting the light beam projected onto the lens to be examined, and a calculator for calculating the refraction information of the lens to be examined on the basis of the detection by the photoelectric detector. The calculator, when it calculates the refraction information of the near viewing portion of a progressive focal lens as the lens to be examined, compares refraction information calculated successively while the examined position of the lens to be examined is moved with the already calculated and memorized refraction information of the far viewing portion of the lens to be examined and successively calculates additional power in each portion to be examined. The calculator further memorizes the maximum value of the successively calculated additional power while renewing it.

REFERENCES:
patent: 4123163 (1978-10-01), Chace et al.
patent: 5173739 (1992-12-01), Kurachi et al.
patent: 5303022 (1994-04-01), Humphrey et al.

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