Shutter speed display device

Details Shutter speed display device Shutter speed display device

1980-10-21

1982-04-20

Gellner, Michael L.

354 53, G03B 1720

Patent

active

043256236

ABSTRACT:
A shutter speed display device for a camera in which light emitting diodes are arranged in a viewfinder of the camera with one light emitting diode corresponding to each of a plurality of shutter speed indicating numerals. The light emitting diodes are connected in a matrix format and driven in a time division manner so that one or more of the light emitting diodes can be simultaneously activated so as to display both the selected shutter speed and to indicate whether the picture would be under-exposed or over-exposed. In one embodiment, both the shutter indicating light emitting diode and the under-exposure and over-exposure diodes are switched on and off at a high rate of speed so that their light output appears to be stable to the operator. In a second embodiment, the light emitting diodes for indicating the under-exposure and over-exposure conditions are made to flicker.

REFERENCES:
patent: 4081805 (1978-03-01), Takahashi
patent: 4095243 (1978-06-01), Numata et al.
patent: 4096494 (1978-06-01), Kawasaki et al.
patent: 4172645 (1979-10-01), Tokutomi

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