Electronic timing device
US3989374A · kind A · utility
Inventors
Key dates
| Filing date | Jun 23, 1975 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | Jun 23, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/72
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 pre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.