Optical focus evaluation and focus adjustment methods, focus eva

Details Optical focus evaluation and focus adjustment methods, focus eva Optical focus evaluation and focus adjustment methods, focus eva

1994-09-22

1997-07-15

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502018, 396150, G01J 120

Patent

active

056486529

ABSTRACT:
The present invention provides methods and apparatuses to evaluate the best image plane position for an optical lens system, particularly a wide angle lens with a large power ratio, in e.g. an endoscope, in simple and less time consuming procedure. The present devices and methods include a screen which can form an edge image, an optical system which forms an image of the screen, a light receiver located at the focal plane, or in its neighborhood, on which the edge image of the screen is formed by the optical system to convert the edge image into an electric signal, and a sampler which samples the electric signal transmitted from the light receiver in a crossing direction perpendicular to the edge image.

REFERENCES:
patent: 2524807 (1950-10-01), Kallmann
patent: 3941996 (1976-03-01), Stauffer
patent: 4963724 (1990-10-01), Neumann
patent: 5055665 (1991-10-01), Baba et al.

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