Automatic focusing camera with control of focusing optical syste

Details Automatic focusing camera with control of focusing optical syste Automatic focusing camera with control of focusing optical syste

1993-05-10

1994-03-08

Perkey, W. B.

G03B 1336

Patent

active

052931935

ABSTRACT:
An automatic focusing camera system has a lens barrel with a focusing optical system, and a camera body. A focus detecting device in the camera body outputs a focus detecting signal. A calculating device in the camera body calculates driving information of the focusing optical system based upon the focus detecting signal. A driving device in the lens barrel has a driving power source and a transmission member for transmitting driving power to the focusing optical system to drive it based upon the driving information. First and second signal generators in the lens barrel, at respective final and initial stages of the transmission member, generate first and second driving signals in response to driving of the focusing optical system A driving control device in the lens barrel controls position of the focusing optical system based upon the first driving signal and the driving information, and controls velocity of the driving power source based upon the second driving signal.

REFERENCES:
patent: 4496229 (1985-01-01), Ogasawara
patent: 4737812 (1988-04-01), Hasegawa et al.

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