Patent · US Expired

Device with a laser for image presentation

US6011643A · kind A · utility

29Cited by

7References

24Claims

0Family size

Assignee

LDT GmbH & Co. Laser-Display-Technologie KG · DE

Inventors

Joerg Wunderlich · Cambridge, GB
Klaus Hiller · Hermsdorf, DE
Frank Goepfert · Jena, DE
Richard Wallenstein · Havelsee, DE
Christhard Deter · Hermsdorf, DE
Wolfram Biehlig · Jena, DE
Juergen Kraenert · Jena, DE

Key dates

Filing date	Jun 24, 1998
Grant date	Jan 4, 2000
Priority date	—
Expiry date	Jun 24, 2018

Classification

Technology area (CPC G)Physics
CPC primaryG02B27/48
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

In a device with a laser for image presentation in which the laser emits laser light of a defined coherence length L at a given wavelength .lambda. and in which there is arranged in the path of the laser light a first structure with which phase displacements can be carried out for individual photons of the laser light in accordance with a predetermined distribution, it is provided that the average path given by the ratio of the average root mean square of the phase displacement formed by the distribution and the magnitude of the wave vector k=2.pi./.lambda. of the laser is greater than the coherence length L multiplied by a factor of 1/(12).sup.1/2.

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