Optical system having a focal point detection device

Details Optical system having a focal point detection device Optical system having a focal point detection device

1997-09-17

1999-03-09

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By surface composed of lenticular elements

396 93, G02B 2714, G03B 1322

Patent

active

058808906

ABSTRACT:
An optical system has a focal point detection device which is suitable for telephotography and is applicable to lenses having different image screen sizes. The optical system includes a photograph section which forms an image of an object, a driving device which moves either the entire photograph section or a part thereof in an optical axis direction, a plurality of re-imaging optical systems which forms re-images of the image of the object by light beams passing through different portions of a pupil of the photograph section, a plurality of imaging devices disposed in the vicinity of image planes of the re-imaging optical systems, and a controller which controls the driving device based on electric signals from the imaging devices so that the image of the object is formed on a mechanical image plane of the photograph section. The optical system is configured so that the re-images of the image of the object are formed on the imaging devices when the image of the object is formed closer to the object than the mechanical image plane of the photograph section.

REFERENCES:
patent: 4322615 (1982-03-01), Fukuhara
patent: 5206498 (1993-04-01), Sensui
patent: 5367153 (1994-11-01), Suda et al.
patent: 5678097 (1997-10-01), Suda et al.

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