Extension tube for camera

Details Extension tube for camera Extension tube for camera

1980-06-23

1982-03-23

Adams, Russell E.

354295, G03B 1700

Patent

active

043209513

ABSTRACT:
An extension tube or barrel which can be connected between a camera body and an interchangeable lens assembly includes a tubular body arranged to be coupled at one end to the camera body and at its other end to the lens assembly. A member within the tubular body is provided for engaging a diaphragm actuating member in the lens assembly in response to movement of an actuating member in the camera body. The extension tube also includes an arrangement for interchanging the positional relationship between the actuating member in the lens assembly and the member in the extension tube when the tubular body is either coupled to or uncoupled from the camera body. Thus, mechanical interference between the actuating member in the camera body and the corresponding member in the extension tube is avoided when the tubular body is placed against the lens mount of the camera and rotated during coupling or uncoupling of the extension tube.

REFERENCES:
patent: 3858225 (1974-12-01), Hasegawa et al.
patent: 3906534 (1975-09-01), Shirasaki
patent: 4003068 (1977-01-01), Hashimoto et al.
patent: 4230403 (1980-10-01), Hashimoto et al.
patent: 4247190 (1981-01-01), Hashimoto et al.
patent: 4251134 (1981-02-01), Sato et al.

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