Addressable vehicular lighting system

• US 6,152,588 A
• Filed: 07/29/1997
• Issued: 11/28/2000
• Est. Priority Date: 09/28/1994
• Status: Expired due to Fees

• Current Assignee: Viavi Solutions, Inc. (Lumentum Holdings Inc.)
• Original Assignee: SDL PLC (RWS Holdings Plc)
• Inventors: Scifres, Donald R.
• Primary Examiner(s): Sember, Thomas M.
• Application Number:
  US08/902,741
• Time in Patent Office: 1,218 Days
• Field of Search: 362/551, 362/552, 362/553, 362/554, 362/582, 362/583, 362/511, 362/540, 362/543, 362/544, 362/580, 362/294, 362/373, 362/547, 362/800, 362/249, 362/545, 340/479
• US Class Current: 362/496
• CPC Class Codes: B60Q 1/0011 with light guides for distributing the light between several lighting or signalling devices
• CPC Class Codes: G02B 6/0001 specially adapted for lighting devices or systems lighting or signalling on vehicles using light guides B60Q1/00; lighting devices for vehicle dashboards B60Q3/10; lighting devices for vehicle interior using light guides B60Q3/62; lighting devices mounted on the vehicle rear part using light guides F21S43/235; measuring arrangements having light conducting pointers G01D13/265; illumination of liquid crystal displays G02F1/1336; illuminated signs G09F13/00
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A vehicle with a plurality of individually addressable light sources, preferably semiconductor laser light sources or light emitting diodes, each of which produce a beam of light, are optically coupled to a fiber optic waveguide. The laser light sources are grouped together preferably at a single location within the vehicle for easy access and conveniently located within the vehicle. Fiber waveguides distally transmits the beams to the optical loads of the vehicle, including the brake lights, taillights, instrumentation lights and turn signals. Each fiber optic waveguide may be a single optical fiber, such as a multimode fiber, having a numerical aperture large enough to receive illumination from a plurality of light sources. In cases where some optical loads require a larger flux or brightness of light, such as vehicular headlights, which may greater than a single optic fiber can transmit, the waveguide may comprise of a bundle of optical fibers. Multiple light sources to a single optical output load allows switching to another operational light source or increase the intensity of remaining light sources should one light source fail. In this manner, the operational life of the vehicular lighting system is increased. Also disclosed is circuitry for operating applications of the system as well as illustrating the employment of color wavelength laser light sources.

Claims

1. A vehicular lighting system for a vehicle comprising:

multiple semiconductor based light sources each providing a light output;

at least two of said light sources having a different wavelength within the visible spectrum;

means for independently controlling current to said light sources to control the intensity of their outputs; and

fiber coupling means for transmitting light from said light sources to at least one optical load on said vehicle.

2. The vehicular lighting system of claim 1 wherein said light sources are semiconductor lasers.

3. The vehicular lighting system of claim 2 wherein said laser sources emit from light within the wavelength range of about 620 nm to about 700 nm.

4. The vehicular lighting system of claim 1 wherein said sources are light emitting devices.

5. The vehicular lighting system of claim 1 wherein said at two light sources of different wavelength are coupled to said optical load.

6. The vehicular lighting system of claim 5 wherein at least one of said two light sources can be current controlled independent of the other of said light sources.

7. The vehicular lighting system of claim 6 wherein said optical load changes color based upon said independent current control.

8. The vehicular lighting system of claim 1 wherein said light sources are located internal of said vehicle.

9. The vehicular lighting system of claim 8 wherein said light sources are temperature controlled.

10. The vehicular lighting system of claim 1 further comprising a plurality of optical loads, different light wavelengths from different light sources provided to different optical loads via optical fibers.

11. The vehicular lighting system of claim 10 wherein said light sources are located within a protective region with said vehicle.

12. The vehicular lighting system of claim 11 wherein said protective region is temperature controlled to maintain to desired temperature ambient.

13. A vehicular lighting system comprising:

a plurality of semiconductor based light emitting sources located in a compartment at a central location within a vehicle;

light from said light sources coupled into a plurality of optical fibers;

at least some of said fibers distributed to separate optical loads on said vehicle;

a temperature controller in said compartment for sensing the temperature of said light sources to maintain the operating temperature of said lights sources at a predetermined temperature condition within the compartment independent of environmental vehicular temperatures external of the compartment.

14. The vehicular lighting system of claim 13 wherein said temperature control includes variation in current operation of said light sources to reduce variation in light output of said light sources due to vehicular temperature variations.

15. A vehicular lighting system comprising:

multiple semiconductor light sources comprising different wavelengths providing different visible colors;

light from said multiple light sources coupled to a plurality of multimode fibers;

at least one optical load coupled to receive at least two different wavelengths of light from said sources;

a dispersion means at said optical load onto which outputs of said two different wavelengths of light from said sources is directed; and

control means to selectively display one or more of said wavelengths at a given time so that several different colors can be selectively produced on said load lens.

16. The vehicular lighting system of claim 15 wherein said dispersion means is a taillight lens.

17. The vehicular lighting system of claim 15 wherein said dispersion means is a vehicle display panel.

18. The vehicular lighting system of claim 15 wherein said dispersion means is a vehicle display panel.