1980-02-19
1981-11-10
Griffin, Donald A.
350252, G03B 1700, G02B 702
Patent
active
042994705
ABSTRACT:
An interchangeable lens assembly for a camera having a first and a second assembly unit releasably coupled to each other. The first assembly unit being directly coupleable to the camera and including an adapter member and a lens barrel which are relatively rotatable. The adapter member includes a retainer device for maintaining the adapter member rotatively fixed when the first assembly unit is mounted on the camera and a first coupling member adapted to engage a first complementary coupling member in the camera to enable releasable coupling and decoupling of the first unit with the camera. A mechanism is provided for returning the aperture signal transmission member to a predetermined position relative to the adapter member when the first assembly unit is dismounted from the camera. The lens assembly also includes a first interlocking mechanism for locking the adapter member and the lens barrel in a predetermined rotative position relative to each other when the first assembly unit is dismounted from the camera, a second locking mechanism for maintaining the adapter member and the lens barrel rotatively fixed relative to each other at a second angular position when the first assembly unit is mounted on the camera and a third locking mechanism for releasably locking the first and second lens units together when they are operatively coupled.
REFERENCES:
patent: 2800052 (1957-07-01), Bechtold et al.
patent: 3142239 (1964-07-01), Meixner
patent: 3858225 (1974-12-01), Hasegawa et al.
patent: 3906534 (1975-09-01), Shirasaki
patent: 4003068 (1977-01-01), Hashimoto et al.
patent: 4062030 (1977-12-01), Starp
Canon Kabushiki Kaisha
Griffin Donald A.
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