Optical scanner for reducing shading
US5459601A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1994 |
| Grant date | Oct 17, 1995 |
| Priority date | — |
| Expiry date | Apr 11, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an optical scanner for reducing shading, a semiconductor laser or a semiconductor laser array is set to a light source and a laser beam from the light source is deflected by a light deflector having a deflecting reflecting face and is converged by a lens for scanning as a light spot on a scanned face to perform an optical scanning operation. The optical scanner has an antireflection coating film disposed on only a refractive face for providing a largest change in incident angle in the deflection of the laser beam with respect to faces of optical elements arranged on an optical path from the light deflector to the scanned face to transmit the laser beam through the optical elements. The optical scanner may have an antireflection coating film disposed on one or more lens faces of the scanning lens such that transmittance of the scanning lens is gradually increased from an optical axis thereof toward both end portions in a main scan-corresponding direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.