Photometric apparatus
US5267015A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1993 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Mar 1, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photometric apparatus includes a charge accumulation type photoelectric transfer unit, a real time monitor unit for monitoring the intensity of incident light in a charge accumulation time of the photoelectric transfer unit, a counting unit for counting a time required for the output of the real time monitor unit to reach a predetermined threshold value, and a memory unit for storing the counted value of the counting unit. A brightness of an object is calculated using the previous counted value stored in the memory unit, the present counted value, the present charge accumulation time, and the A/D converted values of the individual pixel signals obtained on the basis of the present charge accumulation of the photoelectric transfer unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.