Shutter speed indicator device

Details Shutter speed indicator device Shutter speed indicator device

1976-05-03

1978-06-20

Adams, Russell E.

354 23D, 354 60L, G03B 1720

Patent

active

040964949

ABSTRACT:
In a camera, a numerical indication of the shutter speed is displayed thru the viewfinder. Numerals corresponding to the several shutter speeds are arranged to be illuminated, and therefore visible, by light emitting diodes associated therewith. The array of light emitting diodes have their cathode and anode terminals coupled together in groups arranged to reduce the total number of external connections to the diode array. The shutter speed is converted to a digital value which is applied to a decoder. The decoder energizes the external terminals of the diode array to selectively energize only one diode, corresponding to the shutter speed.

REFERENCES:
patent: 3818495 (1974-06-01), Sagara et al.
patent: 3971048 (1976-07-01), Ito et al.
SN74LS139 Spec. Sheet, TTL Data Book, Texas Instruments Corp., pp. 7-134 to 7-137, Dec. 1972.

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