Light beam scanning device and light beam scanning lens
US4962982A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Mar 3, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/125
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Rays of light emitted from a light source are converged into a light beam by a converging optical system. The converged light beam is focused in one direction by a first focusing optical system into a linear image having a longitudinal direction corresponding to a main scanning direction in a light beam scanning device. A light deflector for deflecting the light beam has a deflecting surface disposed near a point where the linear image is focused by the first focusing optical system. The deflected light beam is focused as a light spot on a scanned surface by a light beam scanning lens serving as a second focusing optical system. The focused light spot scans a surface at a substantially constant speed. the light beam scanning lens comprises a single-element lens having a cylindrical surface facing the light deflector and a toric surface facing the surface which is scanned by the focussed light spot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.