Patent · US Expired

Projection apparatus

US6843568B2 · kind B2 · utility

30Cited by

6References

19Claims

0Family size

Assignee

FRAUNHOFER-GESELSCHAFT · DE

Inventors

Harald Schenk · Dresden, DE
Alexander Wolter · Dresden, DE
Markus Schwarzenberg · Dresden, DE

Key dates

Filing date	Apr 5, 2004
Grant date	Jan 18, 2005
Priority date	—
Expiry date	Apr 5, 2024

Classification

Technology area (CPC H)Electricity
CPC primaryH04N5/7416
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The present invention is based on the finding that the previous column and row representation in the scanning image projection has to be given up, in order to enable that the ratio between row and column frequency or vertical and horizontal deflection frequency is not critical and may be decreased. An inventive projection apparatus for projecting an image on an image field includes a deflection means for deflecting a light beam about a first deflection axis at a first deflection frequency and about a second deflection axis at a second deflection frequency different from the first, in order to move the light beam across the image field, as well as a modulation means for modulating an intensity of the light beam depending on the image to be projected. The first and second deflection frequencies differ by less than an order of magnitude.

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