Patent · US Expired

Lenses with a variable refraction index

US5825554A · kind A · utility

1Cited by

5References

9Claims

0Family size

Assignee

Thomson Consumer Electronics · US

Inventors

Gerhard Maier · Herbrechtingen, DE
David Harrison · San Mateo, US
Masahiro Fujimoto · Tokyo, JP

Key dates

Filing date	Dec 3, 1993
Grant date	Oct 20, 1998
Priority date	—
Expiry date	Dec 3, 2013

Classification

Technology area (CPC G)Physics
CPC primaryG02B3/0087
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A lens having a variable index of refraction and a point of symmetry is fabricated from a plurality of substantially identically shaped parts. Each of the parts is pyramidal in configuration and has a base and a plurality of sides extending from the base to an apex. Each of the parts has a coefficient of refraction which varies from the base to the apex.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.