Camera focus detection apparatus detecting focus conditions amon

Details Camera focus detection apparatus detecting focus conditions amon Camera focus detection apparatus detecting focus conditions amon

1995-06-06

1996-03-12

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354408, G01J 120, G03B 1318

Patent

active

054988640

ABSTRACT:
A focus detection apparatus that detects focusing conditions among multiple viewing areas within an image plane of a camera in order to guarantee equal focusing precision among the multiple viewing areas. The focus detection apparatus includes an aperture mask, a secondary imaging lens, and a line sensor which are assembled as a sub-unit. Each area of a multitude of viewing areas is provided with such a sub-unit to perform cross-eye adjustments. Finally, each sub-unit is aligned for installation on a main unit that is equipped with a field lens in order to perform pupil exit adjustments independently for each of the aforementioned viewing areas.

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patent: 5049731 (1991-09-01), Ishida et al.
patent: 5086217 (1992-02-01), Ishida et al.
patent: 5138359 (1992-08-01), Nagano et al.
patent: 5233173 (1993-08-01), Moriyama
patent: 5321248 (1994-06-01), Sensui

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