Electronic timing device

Details Electronic timing device Electronic timing device

1975-06-23

1976-11-02

Adams, Jr., Russell E.

Photocopying

Projection printing and copying cameras

Illumination systems or details

307293, 317141S, 328129, 355 67, G03B 2770

Patent

active

039893740

ABSTRACT:
A novel electronic timing apparatus is described which contains means for selecting a preset time interval and means for selecting an actual interval to be timed which is equal to or less than, and also a function of, the preset interval. When the apparatus begins timing an actual interval, a first energy source is activated and a second energy source is deactivated. When timing of the actual interval is completed, the first energy source is deactivated and the second energy source is activated. The appartus is powered by a power supply means which furnishes a regulated direct current to integrated circuits requiring such and furnishes line frequency current to other circuits. It also contains means for generating and shaping periodic pulses from line frequency current to form an electronic time base signal for its operation. A time base prescaler means reduces the number of periodic pulses contained in the electronic time base signal, the reduction being proprotionately responsive to a signal generated by the actual interval selection means. The time base prescaler means is continually reprogrammed with the signal generated by the actual interval selection means by a time base prescaler control logic means. An electronic counting means counts the number of periodic pulses contained in the electronic time base signal after the signal has been modified by the time base prescaler means. When the electronic counting means reaches a timed out state representative of the elapse of the actual interval being timed, a system logic control provides a signal which is used to deactivate the first energy source and activate the second energy source. Other features of the invention, such as its use in photographic applications and its ability to be reset under various timing conditions, are described herein.

REFERENCES:
patent: 3640620 (1972-02-01), Shatz et al.
patent: 3672767 (1972-06-01), Pamlenyi
patent: 3721908 (1973-03-01), Jurjans
patent: 3739199 (1973-06-01), Negrou
patent: 3832054 (1974-08-01), Sable
patent: 3876950 (1975-04-01), O'Connor

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