Electrostatic copying apparatus
US4533233A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1983 |
| Grant date | Aug 6, 1985 |
| Priority date | — |
| Expiry date | Apr 14, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable magnification electrostatic copying apparatus comprising a transparent plate on which to place a document to be copied, an optical system for projecting the image of the document onto an electrostatographic photosensitive member at any desired projecting ratio selected from a plurality of projecting ratios in an exposure zone located along the moving path of the photosensitive member, and a driving means for moving at least a part of the optical system and the transparent plate relative to each other. The optical system includes at least one position-variable optical element assembly adapted to be held at any of a plurality of positions corresponding to the aforesaid plurality of projecting ratios. The variable magnification electrostatic copying apparatus includes a unique improved means for varying the projecting ratio of the optical system by moving the position-variable optical element assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.