Patent · US Active

Projection device and method for projection comprising optical free-form surfaces

US10764545B2 · kind B2 · utility

0Cited by

4References

20Claims

0Family size

Assignee

Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

Dirk Michaelis · Jena, DE
Peter Schreiber · Jena, DE

Key dates

Filing date	Mar 2, 2018
Grant date	Sep 1, 2020
Priority date	—
Expiry date	Mar 2, 2038

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF21W2121/00
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

What is shown is a projection device having at least one light source and an array of optical channels. Each channel includes a first refractive optical free-form surface and a second refractive optical free-form surface and projection optics. The first and second refractive optical free-form surfaces are arranged between the light source and the projection optics and cause Köhler illumination of the projection optics by an object light pattern, resulting in the image to be projected on an image surface of the projection optics, wherein images of the array of optical channels superimpose one another.

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