System and method for broadcasting colored light for emergency signals

• US 5,691,696 A
• Filed: 09/08/1995
• Issued: 11/25/1997
• Est. Priority Date: 09/08/1995
• Status: Expired due to Fees

• Current Assignee: Federal Signal Corporation, General Electric Company
• Original Assignee: Federal Signal Corporation, General Electric Company
• Inventors: Cassarly, William J., Williams, Jerry L., Mazies, Timothy J.
• Primary Examiner(s): Horsass, Jeffery
• Assistant Examiner(s): Edwards, Jr., Timothy
• Application Number:
  US08/525,833
• Time in Patent Office: 809 Days
• Field of Search: 340/471, 340/472, 340/815.42, 340/815.43, 340/468, 340/555, 340/473, 340/475, 340/479, 359/237, 359/238, 362/32, 362/61, 362/80, 362/293
• US Class Current: 340/471
• CPC Class Codes: B60Q 1/2611 Indicating devices mounted on the roof of the vehicle

Abstract

A lighting system and method for broadcasting colored lights as emergency warning signals from a light source. A centralized continuous light source is coupled via a fiber optic transmission medium to an external display location such as a lens or the like located on a vehicle. The color and the relative intensity of each color is periodically modulated to alternate between at least two states such that the contrast between these alternating states is perceived by observers to be a flashing source of light with no off-time. The frequency and the duty cycle of the repetition rate of alternating between the states may be further controlled to better draw attention to the light source. In one embodiment, the external display locations include optical converters, each converter having multiple input facets and optically arranged to broadcast light received at its facets at predetermined vertical and horizontal output angles.

Claims

1. A system for generating and broadcasting lighting signals from a vehicle, comprising:

means for providing distinct beams of continuous light including at least first and second beams;

a modulator optically coupled to receive the first beam for modifying the properties of the first beam into modulated light periodically varying between at least two output states; and

a converter optically coupled to the modulator and to the second beam by distinct fiber optic transmission paths for conveying the modulated light and the second beam to an exterior of the vehicle, thereby broadcasting from the vehicle at least one of the modulated light and the second beam.

2. The system of claim 1 wherein the modulator includes a filter having at least two selectable settings for modulating the spectral composition of the light, and a controller connected to the filter for selecting the setting thereof.

3. The system of claim 2 wherein the controller operates the filter to modulate the continuous light such that the spectral composition of the light is varied between the two output states.

4. The system of claim 2 wherein the modulator includes means for modulating the intensity of the continuous light in conjunction with the modulation of the spectral composition of the broadcasted light.

5. The lighting system of claim 1 further comprising a controller for selectively broadcasting the second beam from the vehicle and for selectively controlling the modulator to vary the modulated light in a pattern intended to communicate an emergency situation.

6. The lighting system of claim 5 wherein the controller includes a memory, and wherein the memory stores pattern information for controlling the modulator.

7. The lighting system of claim 1 wherein the means for providing distinct beams of continuous light comprises a single light source and a means for dividing the source into distinct beams of continuous light.

8. The lighting system of claim 7 wherein the means for dividing the source into distinct beams of continuous light comprises a dichroic mirror for selectively filtering one range of wavelengths of the continuous light source to provide one beam and for selectively reflecting another range of wavelengths to provide another beam.

9. The lighting system of claim 1 wherein the means for providing distinct beams of continuous light further provides a distinct third beam optically coupled to the converter and operated by the controller for selectively broadcasting the third beam from the vehicle.

10. The lighting system of claim 9 wherein the converter is optically coupled to the modulator, to the second beam and to the third beam by distinct fiber optic transmission paths, and wherein the converter includes a plurality of distinct input facets including a first facet coupled to the fiber optic path that transmits the modulated light, a second facet coupled to the fiber optic path that transmits the second beam, and a third facet coupled to the fiber optic path that transmits the third beam.

11. The lighting system of claim 1 wherein the means for providing distinct beams of continuous light includes first and second fiber optic transmission paths optically coupled to a single continuous light source.

12. The light system of claim 1 wherein the means for providing distinct beams of continuous light includes a plurality of continuous light sources.

13. The lighting system of claim 1 wherein the converter includes a plurality of distinct input facets, and wherein the fiber optic path that transmits the modulated light to the converter is coupled to one facet and the fiber optic path that transmits the second beam to the converter is coupled to another facet.

14. A system for generating and broadcasting lighting signals, comprising:

means for providing distinct beams of continuous light including at least a first beam and a second beam;

a filter optically connected to receive the first beam, the filter having at least two selectable settings for modulating the spectral composition of the received light in accordance with the setting thereof;

a converter optically connected to an output of the filter and to the second beam for broadcasting the modulated light and the second beam into an ambient atmosphere; and

a controller connected to the filter for selecting the setting thereof to selectively modulate the spectral composition of the broadcasted light.

15. The lighting system of claim 14 wherein the controller controls the filter to periodically vary the modulated light in a repetitive pattern intended to communicate an emergency situation, and further controls the second beam for selective broadcasting thereof.

16. The lighting system of claim 15 wherein the controller includes a memory, and wherein the memory stores pattern information accessed by the controller for controlling the filter.

17. The lighting system of claim 14 wherein the converter is optically coupled to the filter output and to the second beam by distinct fiber optic transmission paths.

18. The lighting system of claim 17 wherein the converter includes a plurality of distinct input facets, and wherein the fiber optic path that transmits the modulated light to the converter is coupled to one facet and the fiber optic path that transmits the second beam to the converter is coupled to another facet.

19. The lighting system of claim 14 wherein the means for providing distinct beams of continuous light further provides a distinct third beam optically coupled to the converter and operated by the controller for selectively broadcasting the third beam from the vehicle.

20. The lighting system of claim 19 wherein the converter is optically coupled to the modulator, to the second beam and to the third beam by distinct fiber optic transmission paths, and wherein the converter includes a plurality of distinct input facets including a first facet coupled to the fiber optic path that transmits the modulated light, a second facet coupled to the fiber optic path that transmits the second beam, and a third facet coupled to the fiber optic path that transmits the third beam.

21. The system of claim 14 further comprising at least one fiber optic transmission medium for propagating the first beam to the filter.

22. A converter in an emergency vehicle for coupling light from a light pipe and broadcasting more than one light beam with each of the light beams having a distinct spatial orientation, the converter comprising:

a monolithic piece of optically transparent material having at least two input facets for coupling to light pipes in order to inject light from the light pipes into the material and an output facet forming a lens for broadcasting the beams having distinct spatial orientations, depending on which of the input facets provides the source of the light for the beam.