Bar code reader with diode feedback in amplifier
US4578576A · kind A · utility
6Cited by
7References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1983 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Mar 30, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An operational amplifier is disclosed having a phototransistor at its input for reading a bar code wherein the saturation point of an operational amplifier is controlled by a clamping feedback voltage having a positive control controlling the saturation point of the operational amplifier while prohibiting the operational amplifier from reaching its saturation point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.