Exposure control system
US5107275A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1990 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Nov 13, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/036
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An exposure control system includes a pulsed light source; a photoelectric converting device for receiving a portion of pulsed light from the pulsed light source and for producing a photoelectric signal; an integration gate producing device for producing an integration gate signal after a predetermined specified time from the production of an emission synchronization signal related to the pulsed light source, wherein the specified time is set to be not greater than a delay time from the production of the emission synchronization signal to the start of actual emission of the pulsed light source; and integrating device for integrating the photoelectric signal from the photoelectric converting device during a time period in which the integration gate producing device produces the integration gate signal; and a control device for integrating a resultant of the integration by the integrating device each time one pulse light is emitted, the control device discriminating whether the result of integration is less than a predetermined or not, each time one pulse light is emitted, and the control device stopping the emission of the pulsed light when the result of integration becomes not less…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.