Fiber optic scanning beam detector
US5444239A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1994 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Mar 25, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A fiber optic system is used in a laser ROS scanning system to generate a start of scan signal. In one embodiment, a single optical fiber is positioned at the beginning of a scan line sweep. The fiber transmits a portion of a scan beam energy to a photodetector located on a local electronics board. The photodiode generates an output signal which is sent as an input to a high speed comparator. A second input to the comparator is a divided down and delayed analog of the photodetector output signal. The comparator compares the two voltage wave forms and generates electrical signals at the precise time the two wave forms intersect or crossover. The comparator output is used to initiate the SOS signal of a gas or laser diode ROS.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.