Light-scanning optical system
US6670980B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1999 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Mar 25, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/0005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light-scanning optical system having a function of correcting surface tilt comprises a light source 11; a first optical means 1; a light-deflecting means 14 for reflecting and deflecting a luminous flux by its deflecting/reflecting surface 15 so as to scan a surface to be scanned 18; a first lens 16 having a positive refracting power in each of the main scanning and sub-scanning directions, in which each of both sides is made of a toric surface; and a second lens 17 having a small negative refracting power, in which each of both sides is made of an aspheric surface. A semiconductor laser having a wavelength of 500 nm or shorter is used as the light source. The first and second lenses 16, 17 may be made of plastic. Thus, in a simple configuration, the light-scanning optical system can reduce its size and cost, while being able to respond to higher image density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.