Apparatus for testing lenses by determining best focus

Details Apparatus for testing lenses by determining best focus Apparatus for testing lenses by determining best focus

1981-08-28

1984-03-06

Rosenberger, R. A.

Optics: measuring and testing

Focal position of light source

356125, 250201, G01B 900, G01J 100

Patent

active

044350791

ABSTRACT:
A test lens and a photo-detector array are fixed in position along an optical axis a fixed distance from each other. Light is reflected by the front and rear surfaces of the test lens through an objective lens and is detected by the photo-detector array. The detected light is processed to produce a pixel count by video processing electronics. Control electronics adjusts the focusing of the objective lens by incremental displacement along the optical axis during a measurement cycle and significant focus position data is obtained from the video processing electronics to determine best focus location from which test lens data is derived.

REFERENCES:
patent: 3967056 (1976-06-01), Yata et al.
patent: 4288710 (1981-09-01), Hamilton
patent: 4373804 (1983-02-01), Pryor et al.

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