Copier with anamorphic magnification imaging system
US5436691A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1994 |
| Grant date | Jul 25, 1995 |
| Priority date | — |
| Expiry date | May 5, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/041
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A copier with an anamorphic magnification imaging system is provided with improvements which enable increased resolution of exposed line images at a photoreceptor. The improvement relates to reducing the effective imaging aperture through which the images is projected onto the surface of a photoreceptor. In one embodiment, a gradient index lens array which transmits light reflected from illuminated scan strip on a document platen is provided with two blockers attached to opposite sides of the lens array. Each blocker element has a blocking end which projects into the optical path and blocks a portion of the light that would otherwise be transmitted along the optical path. The effect of the two blockers is to form an effective imaging aperture having a width less than 1mm, in the preferred embodiment about 0.4mm. This narrow imaging width enables a high resolution output image. Increased illumination requirements are met, in another embodiment, by using a faster lens to increase exposure and modifying the lens by adding an extra pitch to increase the total conjugate which would otherwise limited by using the faster lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.