Lens shutter use and non-use switching device of an interchangea

Details Lens shutter use and non-use switching device of an interchangea Lens shutter use and non-use switching device of an interchangea

1978-07-06

1980-04-29

Hix, L. T.

354236, G03B 958

Patent

active

042003857

ABSTRACT:
In the present invention, stopping-down, sector preliminary closure and lens shutter release are effected in association with an interlocking member of the lens. The difference between the amount of operation of the interlocking member effected when a camera with an electronic eye, hereinafter an EE control mechanism is operated is obtained by varying the amount of operation of the interlocking member, regardless of the pressure or absence of EE control provided by the EE control mechanism. The use and non-use of the lens shutter is switched depending on this difference. The relating means between the camera and the lens is substantially identical to the relating means between an ordinary interchangeable lens not having a lens shutter and an automatic aperture. Therefore, for switching between the lens shutter use and non-use, it is unnecessary to provide an additional relating means between the lens and the camera. If the lens shutter is not used, the lens can be used in the same manner as if it was an ordinarily interchangeable lens.
Furthermore, in the present invention, the shutter speed of a focal plane shutter is switched to a constant speed in association with the switching operation to use the lens shutter. Therefore, unlike the case where a conventional focal plane single lens reflex camera and an interchangeable lens with a lens shutter are employed, it is unnecessary in the present invention to switch the shutter speed of the focal plane shutter to a constant speed separately when the lens shutter is used. The associated switching of the present invention is foolproof, and contributes to an improvement in operation.

REFERENCES:
patent: 2708395 (1955-05-01), Wagner et al.
patent: 3635142 (1972-01-01), Ataka
patent: 3648588 (1972-03-01), Alfredsson et al.
patent: 3675561 (1972-07-01), Schwarz

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