Apparatuses for automatic focusing of lens systems, in particula

Details Apparatuses for automatic focusing of lens systems, in particula Apparatuses for automatic focusing of lens systems, in particula

1986-04-08

1988-05-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01T 120

Patent

active

047452714

ABSTRACT:
An improved apparatus for automatic focusing of a lens system, including a space dissector (17) for analyzing the space frequency components of the image planes close to the ideal focus plane, and devices (53, 57) for detecting the position of the plane at which the maximum of space frequencies occurs, close to the ideal focus plane. An electronic device is provided for obtaining a suitable signal from said space dissector (17), to provide an adjustment control signal actuating a servo-control unit controlling the lens focusing, and for thus leading to the image plane having the maximum of high frequency components being placed in coincidence with the ideal focus plane.

REFERENCES:
patent: 3450018 (1969-06-01), John, Jr.
patent: 3538334 (1970-11-01), Shaffer, Jr.
patent: 3917409 (1975-11-01), Kaestner
patent: 3918071 (1975-11-01), Albrecht
patent: 3941996 (1976-03-01), Stauffer
patent: 4037958 (1977-07-01), Schmidt et al.
Molesini et al, "Focus-Wavelength Encoded Optical Profilometer", Optics Communications, vol. 49, No. 4, Mar. 15, 1984, pp. 229-233.
"Leitz Autofocus System (LAF)", Leitz Information Bulletin No. 002/Engl. (Semiconductor products, Information, Suggestions, Problem Solutions; Product Management, Instruments).

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