Adaptable mark/hole sensing arrangement for card reader apparatus
US4088265A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 1976 |
| Grant date | May 9, 1978 |
| Priority date | — |
| Expiry date | May 26, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Card reader apparatus having efficient means for reading information carried by paper cards or the like in the form of punched holes, marks, or both holes and marks. A dual LED light source configuration cooperates with a single light sensitive element to provide for sensing of light transmitted through punched holes in cards transported through the reader, or light reflected from the transported cards. The light sensitive element is incorporated into a simple signal processing circuit which is enabled to generate like output signals corresponding to the sensing of either marks or holes. A novel switching arrangement modifies both the energization of the light source arrangement and the polarity of the electrical supply connected to the processing circuit so as to enable utilization of the simple processing circuit in the operation of the card reader in any one of the reading modes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.