Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1999-02-08
2000-06-27
Epps, Georgia
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
353 84, 359298, G02B 2714, G02B 2608, G03B 2114
Patent
active
060813830
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a multi-colour gobo.
BACKGROUND OF THE INVENTION
Gobos are used in theatres, TV studios, etc., to set desired light patterns and to project a pattern onto a surface. Gobos are a type of diapositive image placed in powerful projectors for projecting the pattern of the gobo onto a background to provide a light pattern or a light image thereon. In order to enable the light pattern to appear in a non-darkened surrounding, powerful projectors are required, these projectors generating a great deal of heat, partly in the form of IR radiation, meaning that the gobo must be heat-resistant.
Because of the high temperatures that prevail, typical plastic diapositives or transparencies cannot be used and it is necessary to either cut or etch the contours of the patterns in metal sheets or in a metal-coated glass sheet. The most usual method of colouring a pattern at present is to mount a colour filter in front of or behind the pattern. This enables only one colour to be applied, however. A multi-colour picture or image can be produced by this method with the aid of several projectors, each having a colour-part of the image directed on one and the same surface, wherewith the overlapping projections reproduce the basic pattern in colour.
It is known to produce a multi-colour image with the aid of a gobo by building-up a plurality of colour-emitting dichroic coatings on a glass plate. The colour-emitting coatings are built-up one at a time. Each coating corresponds to a colour in the image and consequently it is necessary to re-mask when one coating/colour has been built-up and the build-up of a new coating/colour shall commence. In turn, each coating involves a plurality of thin layers with alternate high and low refractive indexes. The coating is normally applied in a vacuum vapourization chamber. It is necessary to remove the glass plate from the chamber and re-mask between coatings, which is a time-consuming, expensive and irrational process. Furthermore, there is a risk of contamination each time the glass plate is masked or removed from the chamber.
SUMMARY OF THE INVENTION
An object of the present invention is to overcome the aforesaid drawbacks and to provide a multi-colour gobo. This object is achieved with a multi-colour gobo that have the characterizing features set forth in the following independent claim.
Further features of the invention and advantages afforded thereby will be evident from the dependent claims and also from the following detailed description of a preferred, non-limiting embodiment of the invention. To facilitate an understanding of the description, the descriptive text includes references to the accompanying drawings, in which mutually equivalent or similar parts have been identified by the same reference signs.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic side view of a multi-colour gobo according to one embodiment of the present invention.
FIG. 2 illustrates the multi-colour gobo according to FIG. 1 schematically and from above.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The multi-colour gobos shown in FIGS. 1 and 2 is circular in shape and can be used in a so-called profile projector to project a multi-colour pattern.
The multi-colour pattern to be projected is colour-separated and rastered (or halftoned) in a manner known in the printing field, resulting in an array of single colour components. Colour separation is effected for instance in a computer that includes appropriate software. Those colours into which the image shall be separated are given and the separating and rastering operation is carried out. This results in what are designated here as single colour components, which is an array of patterns, one for each colour into which the original pattern is separated. The single colour components can normally be reproduced either positively or negatively. Whether positive or negative reproduction is preferred will depend on the following method steps. Colour strength or intensity is reproduced by varying the
REFERENCES:
patent: 5806951 (1998-09-01), Roman et al.
patent: 5953152 (1999-09-01), Hewlett
patent: 5959768 (1999-09-01), Hutton
patent: 6011640 (2000-01-01), Hutton
Edstrom Curt
Tannemyr Michael
Epps Georgia
Seyrafi Saeed
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