Proper focusing state detecting device

Details Proper focusing state detecting device Proper focusing state detecting device

1982-02-23

1985-10-22

Rosenberger, R. A.

Optics: measuring and testing

Focal position of light source

250201, G07J 120

Patent

active

045484953

ABSTRACT:
A device for automatically detecting a proper focusing state of an image-forming optical system e.g. for a photographic camera such as a single-lens reflex camera and the like, comprises a mechanism for splitting a beam of light incident through the optical system. The device does not depend intrinsically upon a current state of polarization of the incident light-beam.
The mechanism for splitting a beam of light comprises a two-component lens arrangement which divides the incident beam of light into two beams of light, and a phase-shifting plate behind one of the components for lengthening the effective optical path of one of the split beams with respect to the other split beam. A first a second array of light-sensing elements is provided for receiving both of the split beams of light for evaluating and comparing the sharpness and other characteristics of the two beams of light.

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patent: 3562785 (1971-02-01), Craig
patent: 3709579 (1973-01-01), Makosch
patent: 3794409 (1974-02-01), Johnson
patent: 3875401 (1975-04-01), Stauffer
patent: 4297571 (1981-10-01), Utagawa et al.
patent: 4333716 (1982-06-01), Sakane et al.
patent: 4349254 (1982-09-01), Jyojiki
patent: 4382665 (1983-05-01), Eguchi et al.

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