Automatic lensmeter

Details Automatic lensmeter Automatic lensmeter

1992-01-21

1994-09-20

Willis, Davis L.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356125, 356127, G01B 900

Patent

active

053494334

ABSTRACT:
An automatic lensmeter for automatically measuring a lens characteristic of a lens to be tested, comprises: a measuring unit including an optical system for detecting a refraction characteristic of the lens; a calculation unit for calculating a lens characteristic value in accordance with information from the measurement unit; a display unit for displaying the lens characteristic value calculated by the calculation unit; an actual eccentricity calculation unit for calculating an actual eccentricity based on the lens characteristic value calculated by the calculation unit; and an optical axis position determination unit for determining whether the actual eccentricity calculated by the actual eccentricity calculation unit is within a predetermined range or not to determine whether the measurement and/or the marking are permitted. The display unit displays the determination of the optical axis position determination unit.

REFERENCES:
patent: 4730924 (1988-03-01), Allard et al.
patent: 4779979 (1988-10-01), Iwane

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