Condensation-free data reading machine
US4905092A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1988 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Nov 2, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/028
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A compact, handy type facsimile machine includes a light source for illuminating an original, a line image sensor for optically reading the original, a condensation sensor for detecting formation of water droplets by condensation on the image sensor, and a control circuit for activating the light source when the condensation sensor has detected the formation of water droplets by condensation on the image sensor. Thus, upon occurrence of condensation, the condensation sensor generates a detection signal, and, in response thereto, the light source is lit to produce heat which then causes the water droplets formed on the image sensor to disappear. Upon disappearance of such water droplets, the control circuit deactivates the light source if there is no original to be read.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.