Automatic replenisher control
US4104670A · kind A · utility
18Cited by
9References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1977 |
| Grant date | Aug 1, 1978 |
| Priority date | — |
| Expiry date | Apr 8, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03D3/065
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic replenisher system for photographic processors has an improved, digital electronic control. The control includes sensors and signal processing circuitry which provide a signal having a frequency indicative of a measured parameter (such as film density or film transport speed) which is associated with the operation of the processor. A counter counts in response to the variable frequency signal. The counter is interrogated at predetermined intervals, and an energizing signal is produced. The energizing signal has a time duration which is determined by the count in the counter at the time of interrogation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.