Focal-plane shutter structure for photographic camera

Details Focal-plane shutter structure for photographic camera Focal-plane shutter structure for photographic camera

1975-03-10

1976-10-05

Hix, L. T.

354249, G03B 942

Patent

active

039848531

ABSTRACT:
The described invention relates to a focal-plane shutter for a photographic camera. This shutter is a slide system having a plurality of parts which move in timed sequence during exposure. The parts include a plurality of sliders which are displaceable relative to one another.
This invention provides a form of focal-plane shutter for a photographic camera wherein there are slide systems which function during exposure in timed succession with each system having a plurality of slides which are movable relative to one another. Each of the slide systems has a driven element which is rectilinearly guided by a single rotatably mounted part held in operational engagement with each individual slide system in such a manner that the slide participating in forming the focal-plane slit width engages its driving part at a point which is at the maximum possible radial distance from the axis of rotation. There is a straight first guide located close to this point and other slides of the system which operationally engage with their respective driving part at a shorter radial distance corresponding to the extent of movement of such slide. Other slides engage straight second guides which are nearer to the axis of rotation of the driving part than the first guide.
This provides a focal-plane slide shutter which has a simple structure in that each slide system includes several slides which require only a single driving lever operationally engaged with all slides. This makes possible a substantially greater ease of operation, as well as a substantially reduced exposure time.

REFERENCES:
patent: 3672282 (1972-06-01), Yamada
patent: 3825940 (1974-07-01), Hayami
patent: 3864713 (1975-02-01), Kitai et al.

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