Scanning optical system subjected to a moisture proof treatment
US4523801A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1982 |
| Grant date | Jun 18, 1985 |
| Priority date | — |
| Expiry date | Feb 24, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical system for scanning a medium with a beam spot includes a light beam generator, a deflector for deflecting the light beam in a predetermined direction and in deflection plane, and an imaging optical system between the deflector and the medium for imaging the light beam from the deflector on the medium as a beam spot, the imaging optical system having at least one lens element mode of a moisture absorbing material. The lens element has a shape in which the dimension in a direction parallel to the deflection plane of the light beam is greater than the dimension in a direction perpendicular to the deflection plane of the light beam. A device mitigates any influence on the imaged condition of the light beam on the medium caused by the lens element being subjected to moisture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.