Focusing apparatus

Details Focusing apparatus Focusing apparatus

1991-10-21

1993-02-16

Gellner, Michael L.

G03B 310

Patent

active

051875136

ABSTRACT:
A focusing apparatus in which a photographing lens can be speedily moved to a desired focus position comprises a rotary barrel for causing the focusing optical system to move in the direction of the optical axis, a moving amount detecting device provided with a detecting section which detects the position of the focusing optical system by detecting the rotational position of the rotary barrel and for outputting moving amount detected signals, a storage device for storing a position of the focusing optical system to be set arbitrarily, a first detecting device for detecting the arbitrarily set position and for outputting detected signals, first and second instruction devices for issuing an instruction for storing the focusing optical system at the set position, for moving the focusing optical system to the set position, a first driving device for driving the storing device, first and second driving control devices for respectively controlling the first and second driving devices in accordance with instructions from the first and second instruction devices and detected signals from the first and second detecting devices, a second driving device for driving the focusing optical system to the set position, and a board having a detecting section for detecting a stored position and a detecting section disposed so as to detect the amount of the movement of the focusing optical system.

REFERENCES:
patent: 4890133 (1989-12-01), Ogawa et al.
patent: 4908647 (1990-03-01), Ueyama
patent: 4937602 (1990-06-01), Himuro et al.

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