Index mechanism for coupling control of operational lens units

Details Index mechanism for coupling control of operational lens units Index mechanism for coupling control of operational lens units

1980-06-13

1982-03-02

Griffin, Donald A.

350257, G03B 1714, G03B 702

Patent

active

043176275

ABSTRACT:
An interchangeable lens unit is formed with an adapter shell rotatable relative to a unit housing and maintained stationary along with signal members of a diaphragm therein during coupling and decoupling of the lens unit effected by rotating a bayonet fixedly carried on the unit housing relative to a camera body. In rotating the unit in a loosening direction, an index mechanism operates to permit disengagement of a female bayonet of the unit away from a male bayonet of the camera body only when the unit housing is accurately oriented relative to the adapter shell. In a later coupling operation, it is therefore insured that the signal members can be brought into operative connection with respective operational members of a diaphragm control mechanism which is disposed in the camera body despite the presence of a significant clearance between the male and female bayonets.

REFERENCES:
patent: 3067665 (1962-12-01), Gebele et al.
patent: 3388647 (1968-06-01), Yajima
patent: 3620149 (1971-11-01), Ogihara
patent: 3675550 (1972-07-01), Ishizaka
patent: 3682069 (1972-08-01), Lecoeur
patent: 3722390 (1973-03-01), Schlapp et al.
patent: 3858225 (1974-12-01), Hasegawa et al.
patent: 3864707 (1975-12-01), Shirasaki
patent: 3906534 (1975-09-01), Shirasaki
patent: 4003068 (1977-01-01), Hashimoto et al.
patent: 4062030 (1977-12-01), Starp
patent: 4230403 (1980-10-01), Hashimoto et al.

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