Optical imaging system having an electronically variable focal l

Details Optical imaging system having an electronically variable focal l Optical imaging system having an electronically variable focal l

1989-09-25

1990-05-22

Miller, Stanley D.

350331R, 350347E, 350339R, 350437, G02F 113

Patent

active

049272411

ABSTRACT:
An imaging system having an electronically variable focal length is obtained by arranging, one after the other, a lens system (10) different sectors of which have different focal lengths and a liquid crystal diaphragm (20). By selecting sectors of the lens system with the aid of the diaphragm, an object (30) can be sharply imaged also at different object lengths in an image plane (40).

REFERENCES:
patent: 3004470 (1957-07-01), Ruhle
patent: 4190330 (1980-02-01), Berreman
patent: 4313663 (1982-02-01), Stemme et al.
patent: 4333720 (1982-06-01), Suzuki et al.
patent: 4601545 (1986-07-01), Kerm
patent: 4704004 (1987-11-01), Nosker
R. A. Soref, "Electrically Scanned Analog L.C.D", Applied Optics, vol. 9, No. 6, Jun. 1970.

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