Patent · US Expired

Automatic transparency masking

US6178672A · kind A · utility

1Cited by

7References

29Claims

0Family size

Assignee

Smartlight Ltd. · IL

Inventors

Dan Inbar · Haifa, IL
Giora Teltsch · Haifa, IL
Hanan Wolf · Haifa, IL
Eran Shaffir · Haifa, IL

Key dates

Filing date	Oct 30, 1997
Grant date	Jan 30, 2001
Priority date	—
Expiry date	Oct 30, 2017

Classification

Technology area (CPC G)Physics
CPC primaryG02B27/024
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A method for viewing transparencies comprising backlighting a transparency with polarized light and viewing the transparency through a polarizer. Preferably, the polarization axis of the backlighting and the polarization axis of the polarizer are oriented at about 90 degrees to each other. The transparency is oriented so that a substantial amount of polarized backlighting passes through the transparency and the polarizer. Also disclosed are apparatus for viewing a transparency using polarized backlighting.

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