Optics: image projectors – Stereoscopic
Patent
1998-12-14
2000-08-29
Gray, David M.
Optics: image projectors
Stereoscopic
353 8, 353 82, 349 15, 359216, 359221, G03B 2100
Patent
active
061097500
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to methods for three-dimensional image representation on a large-screen projection surface using a laser projector.
There are various embodiments of television projectors that can project an image onto a large-screen projection surface. One of these concerns laser projectors. A laser projector can be used for a two-dimensional representation of graphics, etc. For example, in a color laser projector light of the colors red, green and blue is produced by three lasers. The light beams are deflected horizontally by a rotating polygonal mirror. The horizontal deflection permits the representation of a display screen line. After the horizontal deflection, a vertical deflection takes place by means of a further rotating mirror. In this way, the image is projected on a large-screen projection surface via an optical unit. A laser projector thus enables the representation of very large images with particularly brilliant colors.
A color laser projector comprises three lasers for the colors red, green and blue, but the laser design is the same for all three colors. For an individual image point on the large-screen projection surface, the different colors are merely superimposed on one another for a correspondingly required overall color.
Among laser projectors, there are two different basic types. One type operates with multimode lasers and the other type operates with monomode lasers. The laser beams produced by monomode lasers comprise a single direction of polarization.
They have a light polarized in linear fashion. In contrast, the laser beams produced by multimode lasers have circularly polarized light; i.e., they have more than just one direction of polarization. For example, they have 2, 4, etc., different directions of polarization. In the extreme case, their polarizations scatter in all directions.
The principle of laser display technique is described in the German publication Funkschau, 1995, no. 18, pp. 104-107, under the column Technik and the title "Die Laser-Display-Technik," and in a sales brochure, published at the CeBIT 1995, of the company Laser Display Technologie GmbH & Co. KG, Carl-Zeiss-Str. 2, 07552 Gera. In addition, from the German laid open publication DE 32 14 327 Al it is known to occupy a display screen in line-by-line exchange with polarization film strips of alternating directions of polarization, so that a stereo field can be reproduced per television field.
From the references EP-A-0 211 596 and JP-A-59/176 720, methods are known for large-screen projectors with which three-dimensional images can be represented. Polygonal mirrors are thereby used on whose mirror parts a laser beam impinges in frontal fashion.
From the reference DE-A-41 25 241, a method for large-screen projectors is likewise known with which three-dimensional images can be represented. In this method, a polygonal mirror is not used.
SUMMARY OF THE INVENTION
An object of the invention is to indicate methods for three-dimensional image representation on a large-screen display surface by means of the functional principle of a laser projector.
According to the present invention, a method is provided for three-dimensional image representation on a large-screen projection surface by use of a functional principle by a laser projector having a rotating polygonal mirror for line deflection, and having at least one laser that emits a multimode laser beam. The multimode laser beam is directed from the side onto mirror parts of the polygonal mirror which respectively polarize light in first and second different directions in alternating fashion, are arranged in the manner of blades of a propellor, and respectively comprise an angle of incidence from which corresponding to the respectively alternating light-polarizing mirror parts set at an angle, lines are plotted on the large-screen projection surface with the direction of polarization and with the second direction of polarization in respective alternating fashion. The multimode laser beam is controlled such that on the large-
REFERENCES:
patent: 4952956 (1990-08-01), Kikuchi
patent: 5485225 (1996-01-01), Deter et al.
patent: 5903304 (1999-05-01), Deter
Patent Abstracts of Japan--Jun. 10, 1984--59176720.
Fernsehrevolution Durch Die Laser-Display-Technologie.
Die Laser-Display-Technik--Funkschau.
Lockmann Klaus
Mayer Christoph
Gray David M.
Leroux E P
Siemens Nixdorf Informationssysteme Aktiengesellschaft
LandOfFree
Method for three-dimensional imaging representation on a large-s does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for three-dimensional imaging representation on a large-s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for three-dimensional imaging representation on a large-s will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1241923