Medium detecting system with automatic compensation for sensor variations
US4985636A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1989 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Aug 29, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/121
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a medium detecting system having a plurality of optical sensors, each including a light-emitting element and a light-receiving element whose current varies with the amount of light received, and a load resistance unit provided in common for the sensors, the resistance of the load resistance circuit can be varied in accordance with load resistance selecting data supplied thereto. A sensor selector is responsive to sensor selecting data for selecting one of the sensors and connecting the light-receiving element of the selected sensor to the load resistance unit. A rewritable memory stores the sensor selecting data and data used for selecting the load resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.