1989-05-12
1990-06-12
Gellner, Michael L.
354412, 354455, 354458, G03B 300
Patent
active
049336924
ABSTRACT:
A photographic camera which assures proper use of a front converter and prevents out-of-focus photographing when the front converter is used and wherein a switch for detecting whether a tele-converter is in its operative position or inoperative position is not exposed outside the camera. The switch is provided in a converter body removably mounted on a camera body and is connected in series to another switch also provided in the camera body for operation upon attachment of the converter body to the camera. When the converter is mounted in its operative position on the camera body, it is detected by a control circuit in the camera body in accordance with a signal received from the switches, and the control circuit controls various functions of the camera in a different manner from that when the converter is not in its operative position.
REFERENCES:
patent: 4806961 (1989-02-01), Kamitami
Claims and Drawings of U.S.S.N. 253,387, filed Oct. 3, 1988.
Inoue Manabu
Kudo Yoshinobu
Maeda Keisuke
Mima Yujiro
Ootsuka Hiroshi
Gellner Michael L.
Minolta Camera Kabushiki Kaisha
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