Spherical gradient-index lens designs for video-disk pickup lens or the like
US4457590A · kind A · utility
24Cited by
1References
6Claims
0Family size
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Key dates
| Filing date | Jan 11, 1982 |
| Grant date | Jul 3, 1984 |
| Priority date | — |
| Expiry date | Jan 11, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Spherical singlet lenses of gradient index design, suitable for use as video disk lenses or the like, are provided wherein all orders of spherical abberation are sufficiently reduced to provide diffraction-limited axial imaging. This imaging is achieved without resorting to sixth-order refractive index profile control; only the profile parameters N.sub.00, N.sub.10 and N.sub.20 defining the radial index profile N(r) in the profile function: EQU N(r)=N.sub.00 +N.sub.10 r.sup.2 +N.sub.20 r.sup.2 together with the surface curvatures and thickness of the lens, are used to control lens properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.