Patent · US Expired

Scanning optical system and image forming apparatus using the same

US6667822B2 · kind B2 · utility

2Cited by
3References
13Claims
0Family size

Assignee

Inventor

Key dates

Filing dateAug 7, 2001
Grant dateDec 23, 2003
Priority date—
Expiry dateNov 25, 2021

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B26/125
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

A scanning optical system less subject to the effect of decentering of an optical element and having improved optical performance on a scanning surface is provided. The ratio of Ra and Rs satisfies the condition of 0.8<Ra/Rs<1.2 over a full effective scanning area, where Ra represents a radius of curvature in a sub scan sectional plane of a rotationally asymmetrical, anamorphically aspherical surface and Rs represents a radius of curvature in the sub scan sectional plane of a rotationally symmetrical surface that results if a generatrix of the rotationally asymmetrical, anamorphically aspherical surface is rotated about an optical axis.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.