Camera having a shutter instrumentation device which detects the

Details Camera having a shutter instrumentation device which detects the Camera having a shutter instrumentation device which detects the

1997-12-24

2000-06-06

Gray, David M.

Photography

Exposure control circuit

Velocity control of shutter or diaphragm component

396269, 396484, G03B 1724

Patent

active

060729589

ABSTRACT:
A camera having a shutter instrumentation device for accurately measuring the actual shutter time. The camera includes a shutter which travels in a travel plane to open and close an aperture. A signal projection unit, positioned to one side of the travel plane, projects a signal towards the travel plane of the shutter so that the signal reflects off the shutter when the aperture is closed by the shutter and so that the signal passes through the aperture when the aperture is opened by the shutter. A reflecting member, positioned on the opposite side of the travel plane as the signal projection unit is positioned, reflects signals projected by the signal projection unit which pass through the aperture. A signal receiving unit, positioned on the same side of the travel plane as the signal projection unit is positioned, receives either or both of signals projected by the signal projection unit which are reflected off the shutter and signals projected by the signal projection unit which are reflected off the reflecting member. The shutter state can be determined by monitoring the output of the signal receiving unit. The signal receiving unit output experiences two reversals during one exposure action.

REFERENCES:
patent: 3913376 (1975-10-01), Scott
patent: 4572645 (1986-02-01), Yoshida et al.
patent: 4907027 (1990-03-01), Kobe et al.
patent: 5457514 (1995-10-01), Hasuda et al.

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