The invention relates to signage and particularly to an illuminated sign such as those used for indicating a point of entry to or exit from a building, for example an illuminated building exit sign.
At present, particularly in New Zealand, there are available on the market and in use different sizes and constructions of sign for indicating points of entry to and exit from a building.
Typically an exit sign is a device in a public facility (such as a building, aircraft or boat) denoting the location of an emergency exit used to guide people to the closest exit in case of fire or other emergency. Most relevant building codes (fire, building, health or safety) require exit signs to be permanently lit. Exit signs are designed to be absolutely unmistakable and understandable to anyone.
Many exit signs around the world are in pictogram form, with or without a text supplement. The signs often include a white reflector plate to aid illumination but the inclusion of such a plate adds to cost and manufacturing difficulties. There has been a shift towards the adoption of such exit signs in recent decades. A small minority of nations adhere to the requirement that exit signs show the word “EXIT” (or the same or similar word in another language).
Since visibility can be reduced in a fire, due to smoke or failure of electric lighting, the sign is often permanently illuminated, usually by one of:
A number of the known signs have inherent limitations for example there is a significant cost in running standard incandescent bulbs which over time can fail with a resultant loss in their usefulness.
An object of the invention is to provide an illuminated sign which overcomes problems associated with known signs and which at least offers consumers a useful alternative choice.
Further objects and advantages of the invention will become apparent from the following description which is given by way of example only.
According to a first aspect of the invention there is provided an illuminated sign including a single or double sided photometric lens one or both sides of which have in juxtaposition therewith a graphics panel, the photometric lens has one edge lit by a strip of light emitting diodes (LED's) and the lens(es) is(are) adapted to spread the LED's light evenly across the graphics panel and through a clip-on frame for the photometric lens and graphics panel(s) which frame provides edge light distribution for the sign.
The photometric lens preferably has in its upper edge a series of cut-outs into which LED's of the LED strip fit when the sign is assembled.
The illuminated sign can have a housing along its upper edge which covers the LED strip and its connecting wires and in which is mounted electronics which run the LED's and a power source for the electronics and LED's.
The graphics panel can include a pictogram or words as required.
A dot matrix which forms the photometric design is printed on at least one side of an acrylic blade panel and a special ink system is used which allows the natural reflection of light through both surfaces, but without producing any major shadowing through both surfaces, when in contact with the graphic panels.
According to another aspect of the invention there is provided a single or double sided photometric lens for illuminating a sign, the photometric lens being adapted to be placed in juxtaposition with a graphics panel, the photometric lens has one edge lit by a strip of light emitting diodes (LED's) and the lens(es) is(are) adapted to spread the LED's light evenly across the graphics panel and through a frame for the photometric lens and graphics panel(s).
The frame can provide edge light distribution for the sign.
Further aspects of the invention which should be considered in all its novel aspects will become apparent from the following description which is given by way of example only.
An example of the invention will now be described with reference to the accompanying drawing in which:
Examples of the invention will now be described with reference to an illuminated exit sign incorporating a pictogram of a running person. It is to be appreciated that the features of the illuminated sign can be incorporated into a variety of different forms of signage as and if required including the upgrade of existing signage.
In the following description of the example with reference to the drawing similar integers will be referred to using the same reference numbers in the different figures.
In
The dot matrix which forms the photometric design is printed on one side of an acrylic blade lens panel 2 and a special ink application method is used which allows the natural reflection of light through both surfaces of the lens panel 2. In practice a pigment is included to tint a clear ink so that when printed or etched onto the panel the tint aids light being reflected from within the panel 2 without producing any major shadowing when in contact with a graphic panel(s). The pigmented ink can be applied in one pass through a polyester or the like mesh and stencil so that in the one pass a measured build up of the ink is applied to the surface of the panel 2.
The photometric lens 2 has one edge 3 lit by a strip of light emitting diodes (LED's) 4. The photometric lens 2 preferably has in its upper edge 5 a series off cut-outs (shown in
A clip-on frame 6 (shown in detail in
The photometric dot matrix pattern which in the example is on one side of the lens is designed to spread the LED's light evenly across the graphics panels 1 and through the edge of the clip on frame 6.
The illuminated sign of the example has a housing 7 forming its upper edge which housing 7 covers the LED strip 4 and its connecting wires 8 (
The graphics panels 1 can include a pictogram or words as required.
In an alternative construction the photometric lens shown in
Where in the foregoing description particular mechanical or the like integers are described it is envisaged that their mechanical equivalents can be substituted as if they were described herein.
Thus by this invention there is provided an even distribution of light over an illuminated sign with no hot spots or dark areas on the sign.
Particular examples of the invention have been described and it is envisaged that improvements can take place without departing from the scope of the attached claims.
Number | Date | Country | Kind |
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596031 | Oct 2011 | NZ | national |
596752 | Nov 2011 | NZ | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/NZ2012/000197 | 10/29/2012 | WO | 00 | 4/28/2014 |