Projection device and method for projection comprising optical free-form surfaces
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsDirk Michaelis, Peter Schreiber
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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.
Claims20
A projection device comprising at least one light source and an array of optical channels, wherein each optical channel comprises:
- a first and a second refractive optical free-form surface and projection optics;
- wherein the first and second refractive optical free-form surfaces are arranged between the at least one light source and the projection optics, cause a light redistribution and a change in the angular distribution of light of the at least one light source, so as to obtain an object light pattern lying in an object plant of the projection optics, and cause a Köhler illumination of the projection surface of the projection device (2) via the projection optics by the object light pattern,
- where in an image to be projected results on the projection surface of the projection device by a superimposition of light from the optical channels.
A projection device comprising at least one light source and an array of optical channels, wherein each channel comprises:
- a first and a second refractive optical free-form surface and projection optics;
- wherein the first and second refractive optical free-form surfaces are arranged between the at least one light source and the projection optics and cause Köhler illumination of the projection optics by an object light pattern, resulting in an image to be projected by superimposing images of the optical channels of the array on an image surface of the projection optics, wherein the object light pattern is a light pattern to be imaged by the projection optics and comprises a light distribution;
- wherein two channels or two groups of channels of the array of optical channels are configured to process differing wavelength ranges, wherein the first channel or the first group of channels reduces imaging errors in a first wavelength range, and wherein the second channel or the second group of channels reduces imaging errors in a second wavelength range.
A projection device comprising at least one light source and an array of optical channels, wherein each channel comprises:
- a first and a second refractive optical free-form surface and projection optics;
- wherein the first and second refractive optical free-form surfaces are arranged between the at least one light source and the projection optics and cause Köhler illumination of the projection optics by an object light pattern, resulting in an image to be projected by superimposing images of the optical channels of the array on an image surface of the projection optics, wherein the object light pattern is a light pattern to be imaged by the projection optics and comprises a light distribution,
- wherein at least one optical structure is configured to generate an asymmetrical light distribution in the image plane of the projection optics, wherein the optical structure is arranged on an inclined plane in order to reduce discontinuities between mutually adjacent optical structures of neighboring optical channels, and wherein the projection optics is configured to project the images based on the asymmetrical light distribution.
Dependencies are inferred from the claim text.