Automatic focusing optical apparatus

Details Automatic focusing optical apparatus Automatic focusing optical apparatus

1983-02-08

1985-01-01

Gellner, Michael L.

354402, 354406, G03B 310

Patent

active

044914032

ABSTRACT:
An automatic focusing optical apparatus comprises an automatic focusing device which automatically controls the focal point of an optical system and is arranged to be operatable in such a manner that, once the optical system is focused on an object, the focal point of the optical system is fixed to be unvarying irrespectively of changes in the distance to the object; a display device which is capable of displaying the in-focus and defocus states of the optical system independently of the automatic focusing device; and control means for allowing the display device to display solely the in-focus state when the automatic focusing device fixes the focal point of the optical system to be unvarying irrespectively of changes in the distance to the object after the optical system is once focused on the object.

REFERENCES:
patent: 4253751 (1981-03-01), Tokutomi et al.
patent: 4318598 (1982-03-01), Fukuhara et al.
patent: 4333716 (1982-06-01), Sakane et al.

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