F.theta. lens for use in light beam scanner
US4707085A · kind A · utility
14Cited by
15References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1986 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Jan 24, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/0005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An f.theta. lens for use in a light beam scanner for deflecting a monochromatic or quasi-monochromatic light beam. The f.theta. lens comprises two positive-meniscus lenses having concave surfaces directed to a deflection point about which the light beam is deflected. The lenses have lens surfaces having radii of curvature R1, R2, R3, R4 in order from the deflection point, and have a combined focal length f, the f.theta. lens meeting the following conditions: ##EQU1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.