Illumination – Light source and modifier – Adjustable or repositionable modifier
Patent
1999-03-25
2000-12-19
Sember, Thomas M.
Illumination
Light source and modifier
Adjustable or repositionable modifier
362186, 362280, 362281, 362293, 362284, 362324, F21L 700
Patent
active
061619450
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a variable-colour light beam projector of medium or high power (up to 50,000 watt and beyond), having a light source and reflector means arranged to direct the light from the light source in such a manner as to form a light beam.
In U.S. Pat. No. 3,703,635 a light beam projector device is disclosed having a light source and reflector means arranged to direct light from the source in a beam; a wavelength filter in the form of a tubular wall is provided arranged to surround the light source so as to be traversed by the light before this reach the reflector; this tubular wall is movable to an inactive position in which it does not interfere with the light radiation to the reflector.
In DE-A-39 08 148 a light beam projector device is disclosed having a plurality tubular colour filter walls positioned coaxially one within another and close together, each being dedicated to supply a different colour to the light which passes through it; these tubular walls are arranged to be moved independently of each other, and to create in mutual combination a plurality of different colours.
An object of the present invention is to provide a system able to vary the light beam colour which is effective, long-lasting and of relatively simple and lightweight construction.
DISCLOSURE OF THE INVENTION
This and further objects are attained by the invention as characterised in the claims.
The invention concerned is based on the fact that it comprises at least one tubular wall of a material able to filter colour from the light, and arranged, when set in its active position, to laterally embrace the projector light source so as to be traversed by the light before this reaches the reflecting surface, said tubular wall being arranged with its axis substantially coinciding with the axis of the reflecting surface. With the tubular wall there are associate actuator means able to axially move said tubular wall into said active position or to an inactive position, below the reflecting surface, in which it does not interfere with the radiation emitted by the source and directed towards the reflecting surface, and to intermediate positions in which only a part of the tubular wall is traversed by the light.
Furthermore, a second tubular wall, or at least a tubular wall segment, is provided which is positioned coaxially with the first tubular wall and is arranged when in its active position to laterally embrace the light source so as to intercept the radiation emitted by the light source, the second tubular wall or wall segment being of transparent material with its surface suitably treated physically to achieve a frosted light effect which randomly deviates the radiation before it reaches the reflecting surface.
According to another embodiment, the device comprises a light source and reflector means arranged to direct the light originating from the source in such a manner as to form a light beam, wherein said reflector means comprise a curved concave reflecting surface at the geometrical focus of which there is positioned the light source; furthermore it comprises a plurality of tubular walls of a material able to filter colour from the light, each being dedicated to supplying a different colour to the light which passes through it, positioned coaxially one within another and close together, arranged with their axis substantially coinciding with the axis of the reflecting surface; said tubular walls are arranged, when set in their active position, to laterally embrace the projector light source so as to be traversed by the light before this reaches the reflecting surface, and are arranged to be moved independently of each other, and to create in mutual combination a plurality of different colours.
The invention is described in detail hereinafter with the aid of the accompanying figures, which illustrate a non-exclusive embodiment thereof.
FIG. 1 is a schematic view of a light beam projector incorporating the characteristics of the present invention.
FIG. 2 is a perspective view of that part of the p
REFERENCES:
patent: 437178 (1890-02-01), Gulliksen
patent: 3703635 (1972-11-01), Burkarth
patent: 5165781 (1992-11-01), Orak
patent: 5353211 (1994-10-01), Merko
patent: 5642931 (1997-07-01), Gappelberg
Sember Thomas M.
Space Cannon VH S.R.L.
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