Locking mechanism in diaphragm setting ring of SLR camera

Details Locking mechanism in diaphragm setting ring of SLR camera Locking mechanism in diaphragm setting ring of SLR camera

1981-02-25

1982-08-17

Wintercorn, Richard A.

350257, G03B 1700, G02B 702

Patent

active

043446892

ABSTRACT:
A camera has a camera body, an interchangeable lens engageable with the camera body, and a rotatable diaphragm setting ring on the lens. A first mounting member on the camera body interlocks with a second mounting member on the lens to engage the lens with the camera body. A hole is formed in the second mounting member adjacent to the first mounting member and a slideable lock pin is disposed in the hole. The ring is rotatable between an automatic diaphragm control position and a range of diaphragm preset positions. Responsive to the diaphragm setting ring, the pin is retracted to a position approximately flush with the surface of the second mounting member when the diaphragm setting ring is within the range of diaphragm preset positions and the lock pin is extended outwardly from the surface of the second mounting member to the region occupied by the first mounting member when the diaphragm setting ring is at the automatic diaphragm control position. In camera bodies with automatic diaphragm control, the first mounting member has a recess aligned with the hole in the second mounting member to receive the pin in its extended position. In camera bodies without automatic diaphragm control, the first mounting member has a surface abutting the hole in the second mounting member to prevent the lock pin from extending therefrom, thereby blocking rotation of the diaphragm setting ring into the automatic diaphragm control position.

REFERENCES:
patent: 3864707 (1975-02-01), Shirasaki
patent: 4199248 (1980-04-01), Schlapp

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