Optical mark reader
US4641358A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1984 |
| Grant date | Feb 3, 1987 |
| Priority date | — |
| Expiry date | Oct 18, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K17/0032
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The reading of the presence or absence of a pencil or similar mark at various locations on a sheet of paper is accomplished by an optical Mark-Reader comprised of a completely solid state sensing mechanism with no moving parts. The Optical Mark Reader (OMR) contains a matrix of light sensitive transistors with their geometry and logic circuits capable of being tailored for a plurality of answer sheets. The internal logic circuits enable certain sections of the page to be read, generate a delay time while the data is being gathered, tell the host computer when the data is complete, and resets the OMR operator control system for successive page readings. Finally, the internal logic circuits and output bus of the OMR takes the "raw" data from the answer sheets and presents information on an output bus in a format allowing any computer (even a micro-computer) to be the host computer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.