Digital timer for a photographic camera shutter

Details Digital timer for a photographic camera shutter Digital timer for a photographic camera shutter

1975-02-19

1977-03-29

Adams, Jr., Russell E.

354 24, 354 50, 354 60A, G03B 708

Patent

active

040152758

ABSTRACT:
Digital timers for the electronic control of a camera shutter having a pulse generator and a number of binary dividers each associated with a resistor, the total of these resistors performing a digital to analog conversion and being connected to a common point. The potential of the common point being representative for the number of the binary dividers being in "1" state. A comparator actuating a shutter solenoid when the potential of the common point reaches a predetermined value. All the resistors having the same conductance so that at those times corresponding to powers of 2 (reference timing series) values of potential are formed, which correspond to the logarithm of the time obtained.

REFERENCES:
patent: 3824608 (1974-07-01), Toyoda
patent: 3843249 (1974-10-01), Kitauva

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