Focal length switching type camera

Details Focal length switching type camera Focal length switching type camera

1986-05-07

1988-01-05

Perkey, W. B.

354266, G03B 310, G03B 1738

Patent

active

047179325

ABSTRACT:
A focal length switching type camera wherein a lens unit having a photographic lens is selectively moved to one of at least two predetermined normal positions to thereby be able to switch at least two focal lengths, and a judgement device judges whether or not the lens unit is in the predetermined normal position. An actuator device is actuated if the judgement device judges that the lens unit is not in the normal position. The actuator device is alarm means or a light emitting member for giving an alarm that the lens unit is not in the normal position.

REFERENCES:
patent: 2694352 (1954-11-01), Babbs
patent: 2725805 (1955-12-01), Jackson et al.
patent: 4200378 (1980-04-01), Shenk
patent: 4544249 (1985-10-01), Maemori et al.
patent: 4597657 (1986-10-01), Wakabayashi

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