Optical scanner
US6101020A · kind A · utility
6Cited by
1References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1999 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | Dec 3, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/128
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical scanner is provided that reduces chromatic aberration (focus error) due to mode hopping of a semiconductor laser light source and that can give high-resolution output applicable to digital copiers and optical printers even when using an imaging optical system having only a few lens elements. At least one surface of the collimating lens includes a zone plate diffractive optical surface which meets specified design conditions to ensure that the focus error due to mode hopping is acceptably small.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.