Illumination – Light source or light source support and luminescent material
Patent
1986-06-24
1988-05-10
Hart, Douglas
Illumination
Light source or light source support and luminescent material
40542, 40543, F21V 916, G09F 1320
Patent
active
047440120
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a lighting assemblage, hereinafter referred to generally as a lamp unit, incorporating a surface which is illuminated by a light source.
The lamp unit according to the invention has a wide field of use, and can be utilized as a lighting source for illuminating signs and for illuminated positional markings, etc.
The invention can be applied to particular advantage in conjunction with signs of the kind provided with text or an image which need only be emphasized during certain time periods. Examples of such signs include road signs which warn that a bridge is about to open, signs which warn against temporary hazards, etc, etc. Such signs are to be found in many different forms. A common feature of all such known signs, however, is that the text and/or image(s) provided thereon is made visible or invisible to an observer with the aid of different mechanical devices.
The present invention eliminates the need of all mechanical elements, while still enabling the text and/or image(s) on the sign to be made visible or invisible as required.
The present invention can also be applied to reference signs of various kinds, on which positional markings are also to be found and which are required to be activated solely during certain time periods.
The invention can also be applied with advantage as an illumination source for monochromatic or substantially monochromatic light, as exemplified hereinafter.
The aforementioned fields of use are merely selected examples of preferred and possible fields in which the present invention can be applied.
The present invention relates to a lighting assemblage or lamp unit which comprises a box-like body which has located therein one or more apertures which are covered with a sheet of material transparent to visible light, and which houses a light source, the lamp unit being characterized in that the side of the transparent sheet, or sheets, facing inwardly of the body is, or are covered either totally or partially with a substance layer which fluoresces when irradiated with ultraviolet light; and in that the light source is an ultraviolet light source.
The invention will now be described in more detail with reference to an exemplifying embodiment thereof illustrated in the accompanying drawings, in which
FIG. 1 is a schematic sectional view of a lamp unit according to the invention, taken on the line A--A in FIG. 2;
FIG. 2 is a front view of a lamp unit according to the invention;
FIG. 3 is a schematic sectional view of an arrangement incorporating a lamp unit according to the invention;
FIG. 4 is a schematic sectional view of a modified embodiment of a lamp unit according to the invention, taken on the line B--B in FIG. 5; and
FIG. 5 is a front view of a lamp unit according to FIG. 4.
The lamp unit or lighting assemblage illustrated in the drawings includes a box-like body 1 provided with one or more apertures 2; 3-5. The aperture 2, or the apertures 3-5, is or are, covered with a respective sheet of material which is transparent to visible light. A light source 7-9 is arranged within the body 1.
In accordance with the invention, the side 10 of the sheet 6, or optionally the sheets 6, facing inwardly of the body 1 is, or are, covered totally or partially with a layer of substance which fluoresces when irradiated with ultraviolet light. A number of brands of such substances are readily available commercially. In accordance with one preferred embodiment of the invention, the substance is a paint which fluoresces when irradiated with ultraviolet light. This substance may either be one which becomes transparent or dark when irradiated with light within the visible spectrum, or a paint which exhibits a certain colour or hue even when irradiated solely with visible light. When the substance is to be irradiated solely with visible light, however, the substance or paint shall not fluoresce.
According to the present invention, the light source 7-9 is arranged to transmit ultraviolet light. According to one preferred embodiment of the invention, the light sour
REFERENCES:
patent: 2213868 (1940-09-01), Lucian
patent: 2709863 (1955-06-01), Bevacqua
patent: 2878606 (1959-03-01), Meijer
patent: 3270201 (1966-08-01), Hardesty
PCT/US83/01483 Publ. No. WO84/01460, Apr. 12, 1984.
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