Automatic focus detecting apparatus

Details Automatic focus detecting apparatus Automatic focus detecting apparatus

1989-01-23

1990-08-28

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

2502012, 2502014, G03B 700, H01J 142

Patent

active

049529650

ABSTRACT:
An improved focus detecting apparatus comprises a photographic lens, focus adjusting apparatus for driving the photographic lens which has been placed on an initial focusing position to an in-focus position, an auxiliary light emitting apparatus for emitting an auxiliary light and a switch for selecting whether the focus adjustment should be carried out with the auxiliary light emitted or the focus adjustment should be carried out without the auxiliary light. The initial focusing position of the photographic lens can be switched dependent on whether the auxiliary light is emitted or not.

REFERENCES:
patent: 4265528 (1981-05-01), Bestenreiner et al.
patent: 4521093 (1985-06-01), Kawabata et al.
patent: 4743931 (1988-05-01), Matsuzaki et al.

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