Mount device of an interchangeable lens

Details Mount device of an interchangeable lens Mount device of an interchangeable lens

1980-08-11

1983-07-05

Punter, William H.

354 24, 354 46, 354286, G02B 702, G03B 720

Patent

active

043914888

ABSTRACT:
In an interchangeable lens having a mount mountable on a camera incuding an electric circuit associated with exposure control and a displaceable actuating member for correcting the electric circuit so as to be accommodated to the focal length of the interchangeable lens mounted, a signal member is provided projectedly from one end of the mount and engageable with the actuating member so as to cause said displacement when the interchangeable lens is mounted on the camera. The signal member has an engaging end portion engageable with the actuating member. The engaging end portion lies at a position determined relative to the mount for displacing the actuating member by an amount related to the logarithm of the focal length of the interchangeable lens.

REFERENCES:
patent: 3486434 (1969-12-01), Suzuki et al.
patent: 4192586 (1980-03-01), Orban
patent: 4312579 (1982-01-01), Araki
patent: 4314752 (1982-02-01), Ishizaka et al.

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