Illuminated sign for traffic control and method for functional monitoring of such a sign
First Claim
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1. A sign for traffic control, comprising:
- light sources, including light-emitting diodes, for production of light to illuminate the sign; and
a monitoring device for functional monitoring of the light sources, wherein the monitoring device is designed to produce a limited monitoring current flow through the light-emitting diodes that restricts light emission from the light-emitting diodes in a manner not perceptible by a viewer of the sign, the monitoring device including switching means for switching off the monitoring current flow when a current level reaches a predetermined threshold value.
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Abstract
An illuminated sign is for traffic control, in particular for road traffic, and includes light sources for generation of the sign and a monitoring device for functional monitoring of the light source. The light sources are embodied as light diodes and the monitoring device is embodied as a device for the limited current loading of the light diodes. The functional monitoring of said sign can be achieved with reasonable technical requirements in both the deactivated and activated state thereof.
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Citations
33 Claims
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1. A sign for traffic control, comprising:
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light sources, including light-emitting diodes, for production of light to illuminate the sign; and a monitoring device for functional monitoring of the light sources, wherein the monitoring device is designed to produce a limited monitoring current flow through the light-emitting diodes that restricts light emission from the light-emitting diodes in a manner not perceptible by a viewer of the sign, the monitoring device including switching means for switching off the monitoring current flow when a current level reaches a predetermined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for functional monitoring of a sign for traffic control including light-emitting diodes to produce light to illuminate the sign, comprising:
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switching on current flow through the light-emitting diodes by generating a current monitoring signal, representing current level through the light-emitting diodes; and switching off the current flow when the current monitoring signal reaches a predetermined threshold value;
whereinthe current flow through the light-emitting diodes causes light emissions not perceptible by a viewer. - View Dependent Claims (14, 15, 16)
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17. A monitoring method for a traffic control sign, including light-emitting diodes adapted to produce light to illuminate the sign, comprising:
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generating a current monitoring signal, representing current level through the light-emitting diodes, that permits limited current flow through the light-emitting diodes producing non-perceptible emissions by the light-emitting diodes; and controlling a switching off of the current flow when the current monitoring signal reaches a predetermined threshold value. - View Dependent Claims (18, 19)
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20. A device for a sign for traffic control, including light-emitting diodes adapted to produce light to illuminate the sign, comprising:
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means for generating a current monitoring signal, representing current level through the light-emitting diodes, that permits limited current flow through the light-emitting diodes producing non-perceptible emissions by the light-emitting diodes; and means for controlling a switching off of the current flow when the current monitoring signal reaches a predetermined threshold value. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A sign for traffic control, comprising:
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means, including a plurality of light-emitting diodes, for producing light to illuminate the sign; and means for producing a limited monitoring current flow through the light-emitting diodes that restricts light emission from the light-emitting diodes in a manner not perceivable by a viewer of the sign, the means for producing including switching means for switching off the current flow when a current level reaches a predetermined threshold value, wherein said limited monitoring current flow is for functional monitoring of the LEDs. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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Specification