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1. (WO2017037101) PROJECTION DEVICE AND METHOD FOR PROJECTION COMPRISING OPTICAL FREE-FORM SURFACES

Pub. No.:    WO/2017/037101    International Application No.:    PCT/EP2016/070490
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Sep 01 01:59:59 CEST 2016
IPC: G03B 21/13
F21W 121/00
Applicants: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Inventors: MICHAELIS, Dirk
SCHREIBER, Peter
Title: PROJECTION DEVICE AND METHOD FOR PROJECTION COMPRISING OPTICAL FREE-FORM SURFACES
Abstract:
The invention relates to a projection device (2) comprising at least one light source (4) and an array of optical channels (6, 6a, 6b). Each channel comprises a first refractive optical free-form surface (8a, 8b) and a second refractive optical free-form surface (10a, 10b) and a projection optical system (12). The first and the second refractive optical free-form surfaces (8, 10) are arranged between the light source (4) and the projection optical system (12) and bring about a Köhler illumination of the projection optical system (12) from a light object structure (13a, 13b, 13a', 13b', 13a", 13b"), which produce the image (14a, 14b) to be projected on an image surface of the projection optical system (12), wherein the images of the array of optical channels (6) overlap.