Light beam scanning apparatus
US4886967A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 28, 1987 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Aug 28, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04744
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light beam scanning apparatus is provided wherein a sheet such as a stimulable phosphor sheet or photographic material undergoes two dimensional scanning by scanning the sheet with a deflected light beam to perform main scanning, and transferring the sheet in a direction perpendicular to the main scanning direction to perform sub-scanning, using two pairs of rollers synchronously driven to carry the sheet while clamping it therebetween. A sheet support member is located between the roller pairs and provided with at least two apertures in alignment with the main scanning line, and a photoelectric element is disposed in each of the apertures for receiving the light beam transmitted by the aperture, whereby any misalignment of the sheet can be detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.