Optical scanner
US5557448A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1995 |
| Grant date | Sep 17, 1996 |
| Priority date | — |
| Expiry date | May 3, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an optical scanner, a light beam deflected by an optical deflector is reflected on a reflective image forming element and is converged as a light spot onto a scanned face through an elongated lens to perform an optical scanning operation. The reflective image forming element is formed by a plastic material and has a function for approximately converging the deflected light beam onto the scanned face with respect to a main scan-corresponding direction. The reflective image forming element also has a function for approximately moving the light spot at an equal speed. The elongated lens is formed by plastic and has a function for converging the deflected light beam onto the scanned face with respect to a cross scan-corresponding direction in cooperation with the reflective image forming element. The elongated lens also has negative refracting power with respect to the main scan-corresponding direction. In this optical scanner, the influence of a change in temperature on optical scanning characteristics can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.