Track sensor controller
US4352013A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1980 |
| Grant date | Sep 28, 1982 |
| Priority date | — |
| Expiry date | Jun 2, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K13/067
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An integrated circuit is shown for use as a controller for a track sensor used with document processors. The track sensor includes a light source and a light detector. The circuit monitors the signal from the light sensing portion of the sensor, comparing the signal with a standard value and providing a feedback signal to the light source to adjust the intensity of the light to compensate for the effects of aging, holes in a document, the accumulation of dirt on sensor lenses and the like. The circuit determines when the leading edge of a document arrives and when the trailing edges pass by. It includes elements which prevent false indications that the trailing edge has passed when holes go by the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.