Apparatus for identifying sheet-like printed matters
US4319137A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1979 |
| Grant date | Mar 9, 1982 |
| Priority date | — |
| Expiry date | Nov 7, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/12
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An apparatus for identifying whether a sheet-like printed matter is true or false comprises means for detecting a plurality of positions of a moving sheet-like printed matter to produce a plurality of position signals, timing signal generating means for producing timing signals on the basis of the position signals, a reference light source for irradiating an information detecting area lying on the object moving path to detect the information of the sheet-like object, opto-electric converting means which produces an electric signal with an amplitude corresponding to an intensity of a reference light transmitted through or reflected from the printed matter when the object exists in the information detecting area and an electric signal with an amplitude corresponding to an intensity of reference light when the object does not exist in the information detecting area; integration means for integrating the electrical signal from the opto-electric converting means which integrates an electric signal from the opto-electric converting means during a first period defined by a timing signal from the timing signal generating means and integrates an electric output signal of the printed matter …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.