Image reader with DC-coupled integration circuit
US6693269B2 · kind B2 · utility
20Cited by
12References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2001 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Oct 11, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01T1/208
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A photomultiplier which detects feeble light emitted by the irradiation of excitation light on an image carrier carrying an image related to a living organism has an integration circuit is DC-coupled with a photomultiplier to convert a current signal output from the photomultiplier, to a voltage signal. The voltage signal converted by the integration circuit is logarithmically compressed with a logarithmic conversion circuit. An offset compensation circuit is provided for reducing an offset voltage that could occur because of charge injection in the integral action of the integration circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.