1984-08-28
1987-04-21
Mathews, A. A.
350257, G03B 1714, G02B 702
Patent
active
046592032
ABSTRACT:
An interchangeable lens unit is detachably attachable to a camera main body through an improved bayonet arrangement which includes three sets of corresponding bayonet claws, one of the corresponding bayonet claws of each set being provided on a mount member of the lens unit and the other on a mount member of the camera main body. The bayonet claws of the three sets are formed, in mutual dimension and dispositions thereof, such that the corresponding bayonet claws of one of the sets engage one another at an upper peripheral part of the mount members immediately above the center of the mount members and the corresponding bayonet claws of the remaining two sets engage one another respectively at lateral side peripheral parts of the mount members diametrically opposite to one another with respect to the center of the mount members in the lateral direction, when the camera main body and the lens unit attached thereto are viewed from their front with the camera main body held in a normal erect state. The camera main body is provided with a spring member which can urge the bayonet claws on the mount member of the lens unit for ensuring contact between the mating mount surfaces of the mount members.
REFERENCES:
patent: 2260991 (1941-10-01), Gorey
patent: 2643581 (1953-06-01), Wehrenfennig
patent: 3500735 (1970-03-01), Hiroshimito
patent: 4017878 (1977-04-01), Hagiwara
patent: 4239364 (1980-12-01), Doi
patent: 4302077 (1981-11-01), Sato et al.
patent: 4307954 (1981-12-01), Ludwig
Camera Technology Handbook, published Jul. 15, 1979, pp. 58, 59 (with translation).
Maekawa Yukio
Niwa Masatake
Mathews A. A.
Minolta Camera Kabushiki Kaisha
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