Optical scanning system with unvarying image surface under environmental temperature change
US6781729B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 2002 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | Aug 31, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical scanning device employing a scanning imaging optical system that includes a first optical system configured to receive a light flux emitted from a light source, and a second optical system configured to condense the light flux to form a long linear image in a main scanning direction in a vicinity of a deflecting surface of an optical deflector. Also includes is a third optical system configured to condense a light flux deflected by the optical deflector toward a scanned surface to form an optical beam spot on the scanned surface so that a maximum value &Dgr;Mmax and a minimum value &Dgr;Mmin of an amount of change &Dgr;M in an image-surface curvature in the main scanning direction at each image height in an effective writing region with respect to a change &Dgr;T in an environmental temperature satisfy a condition of |(&Dgr;Mmax−&Dgr;Mmin)/&Dgr;T|<0.01 (mm/° C.).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.