Focus detection device

Details Focus detection device Focus detection device

1983-06-16

1985-03-26

Adams, Russell E.

Optics: motion pictures

Removable film strip magazine type

352140, G03B 300

Patent

active

045069700

ABSTRACT:
A focus detection device is disclosed which has a light path splitting apparatus provided just in front of a diaphragm in the optical path of an image forming optical system and a different optical system from the aforesaid image forming optical system in the direction in which the split-off part of the light bundle by the aforesaid splitting apparatus goes. On an optical axis of the focus detecting optical system, the conjugate positions to a prescribed focal plane of the image forming optical system and at least two positions on its optical axis are occupied by respective photo-sensitive elements using their outputs for in-focus detection.

REFERENCES:
patent: 4283863 (1981-08-01), Heiniger et al.
patent: 4333716 (1982-06-01), Sakane et al.

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