Composite gradient index and curved surface anamorphic lens and applications
US4900138A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1988 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Jul 1, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A composite gradient index and curved surface anamorphic lens has a gradient index of refraction and at least one curved surface. Combinations of planar and radial gradients with spherical and cylindrical surfaces are described. A corrector for an light source whose beam divergences are different in orthogonal planes using such a lens and a light beam scanning mechanism are disclosed. In the light beam scanning system, a homogeneous toroidal lens is replaced by a toroidal equivalent gradient-index lens, hereafter referred to as a TEGIL. The lens reduces undesirable displacement of the focus light beam from a scan line on a receptor plane and from the receptor plane itself. The TEGIL comprises a body of gradient-index material having cylindrical faces for generating optical power in a first dimension and whose gradient-index generates optical power in an orthogonal dimension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.