Lens assembly for long-life laser imaging system
US4953927A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 1988 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Dec 2, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0031
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A system for imaging a line comprises a laser for emitting a modulated laser-light beam, an image-receiving surface, and a reflective element between the laser and the surface for deflecting the beam in an x-direction of the line to be imaged onto the surface. A lens assembly including a cylinder lens is provided between the laser and the element for focussing the beam on the element and a telescopic lens system is provided between the reflective element and the surface and including an upstream lens spaced by its focal length downstream from the reflective element and a downstream lens focussed downstream. Another simple cylinder lens is provided between the upstream and downstream lenses having a refractive power perpendicular to the x-direction. A projecting lens between the downstream lens and the image surface receives the beam from the downstream lens and focusses it on the surface. The middle lens has a refractive power perpendicular to the beam traversing it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.