Illumination – Light source or light source support and luminescent material
Patent
1995-10-30
1997-10-21
Husar, Stephen F.
Illumination
Light source or light source support and luminescent material
362812, 40543, F21V 916
Patent
active
056789173
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for compensating for color when illuminating fluorescent objects that fluoresce when illuminated with ultraviolet light.
The objects concerned may be of diverse kinds, such as different signs that have different functions, road markers, sea markers, etc. Flags are objects of primary interest.
2. Description of the Related Art
Swedish Patent Specification No. 9200250-0 relates to a method for illuminating flags hoisted on flag poles, particularly advertising flags of the kind that are placed along automobile routes in the vicinity of restaurants, hotels, gas filling stations. The invention defined in this patent specification is characterized by illuminating one or more flags which include ultralight fluorescent material by means of one or more illuminating lamps which emit a significant percentage of ultraviolet light.
Such flags are used to a large extent to mark the presence of hotels, filling stations, restaurants, etc., among other things. Often there is a desire to amplify the effect by placing a number of flags adjacent to one another, and often on relatively high flag poles. The intention is to draw the attention of motorists to the presence of a filling station or a rest station in good time before the motorist reaches the particular station concerned. Such flags can be seen relatively well in the daylight hours. The flags are relatively normally illuminated by illuminating lamps during the darker of the day. The illuminating effect is restricted by the fact that the flags normally take-up only a small part of the light cone of the lamps, therewith illuminating the flags only to a limited extent.
The flags are made visible to a very great extent when illuminated with ultraviolet light, therewith enabling the flags to be seen much more clearly during the dark hours of the day.
A very large part of flags of this nature, such as advertising flags, are often white in color, for instance having a white background. It is relatively usual to produce advertising flags and the like from a white fabric on which different trade names and/or text are printed.
One serious problem is that when illuminating fluorescent flags that are comprised of a white fabric, the fluorescence effect obtained is always more blue than white. The same applies to fluorescent white paints, dyes and plastics.
This problem is mainly due to two thing. Lamps that emit ultraviolet light and are capable of being used in practice include a filter which functions to filter-out visible light. Firstly, the filter allows a certain amount of visible blue light to pass through and this light is reflected by the fabric as it impinges thereon. The fabric is therewith seen to be blue by the eye of the viewer. Secondly, white fluorescent pigment is often comprised of a so-called optical whitening agent which fluoresces in a spectrum that has dominance in the visible blue range.
Consequently, a flag for instance which is intended to be white end which is seen to be white in daylight will no longer be seen as white when illuminated with ultraviolet light during the dark hours, but will be seen as varying degrees of blue. There is a strong desire for flags to be seen as white even when illuminated with ultraviolet light. The same problem is found with objects other than flags.
An object of the present invention is to solve this problem.
SUMMARY OF THE INVENTION
Accordingly, the present invention relates to a method of compensating for color when illuminating fluorescent objects with the aid of one or more illuminating lamps which emit a significant amount of ultraviolet light, particularly when illuminating flags that are hoisted on flag poles, wherein the objects include ultralight fluorescent material and have a white or light color when illuminated with visible light. The method therefor characterized by including in the object an additional fluorescent material which when illuminated fluoresces in a color which together with a weak blue color, the b
REFERENCES:
patent: 5398174 (1995-03-01), Fast
patent: 5436812 (1995-07-01), Stewart
Husar Stephen F.
Mangels Alfred J.
Ultralux AB
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