Addressable laser vehicle lights

• US 5,713,654 A
• Filed: 09/28/1994
• Issued: 02/03/1998
• 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): Lazarus, Ira S.
• Assistant Examiner(s): Sember, Thomas M.
• Application Number:
  US08/313,757
• Time in Patent Office: 1,224 Days
• Field of Search: 362/61, 362/80, 362/32, 362/245, 362/259, 362/241, 362/294, 362/373, 362/800, 362/249, 362/246, 362/20, 340/472, 340/435
• 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 lighting system using individually addressable laser diodes or laser arrays coupled to a fiber optic waveguide. A plurality of laser light sources are grouped together and conveniently located on the vehicle. Each laser light source is individually addressable and produces a beam that is coupled to a fiber optic waveguide. The waveguide distally transmits the beam to various optical loads on the vehicle. Alternatively, each fiber optic waveguide may be coupled to receive a beam from more than one laser light source. This allows switching to an operational light source should one fail. In this manner, the operational life of the system is increased.

Claims

1. A vehicle lighting system comprising:

a plurality of semiconductor light emitters grouped together, each emitter adapted to generate a beam,

a plurality of optical loads mounted on a vehicle, and

means for transmitting at least one of said beams to each of said optical loads, wherein said plurality of semiconductor light emitters includes a subset of selectively controllable semiconductor light emitters coupled to one of said optical loads, with said plurality of emitters being in a fixed spatial relationship with respect to said transmitting means.

2. The vehicle lighting system of claim 1 wherein each of said plurality of emitters is coupled to said transmitting means, said transmitting means including a plurality of optical fibers, at least one fiber associated with each emitter.

3. The vehicle lighting system of claim 1 wherein each of said plurality of emitters is distally positioned from each of said plurality of optical loads, each of said emitters being separately controllable from the others.

4. The vehicle lighting system of claim 1 further including means, connected to each of said plurality of emitters, for maintaining a temperature of said emitters at a predetermined temperature.

5. The vehicle lighting system of claim 1 further including a diffuser positioned between said transmitting means and each of said plurality of optical loads to diffuse a beam exiting said transmitting means.

6. The vehicle lighting system of claim 1 further including a focusing means for controlling the divergence or direction of a beam exiting said transmitting means.

7. The vehicle lighting system of claim 6 further including a means, positioned between said transmitting means and each of said plurality of optical loads, for diffusing said beam exiting said transmitting means.

8. The vehicle lighting system of claim 1 wherein each of said plurality of emitters is a semiconductor laser.

9. The vehicle lighting system of claim 1 wherein said subset comprises one of said plurality of emitters.

10. The vehicle lighting system of claim 1 further including means for modulating each of said plurality of emitters to create a flashing light, said flashing light transmitting data to a light receiver located away from the vehicle containing the modulating means.

11. The vehicle lighting system of claim 10 wherein said flashing light is amplitude modulated.

12. The vehicle lighting system of claim 1 wherein at least two of said plurality of emitters transmits a beam having a wavelength, different from the remaining emitters, to a single optical load.

13. The vehicle lighting system of claim 1 wherein at least two of said plurality of emitters transmits a beam having a wavelength, different from the remaining emitters, to different optical loads.

14. The vehicle lighting system of claim 1 wherein said plurality of emitters are semiconductor lasers fabricated from material containing elements selected from the group consisting of N, In, Ga, Al, As and P.

15. The vehicle lighting system of claim 14 wherein the temperature of said plurality of emitters is controlled by a thermo-electric cooler.

16. The vehicle lighting system of claim 1 wherein said plurality of semiconductor light emitters is a monolithic array of laser emitters.

17. The vehicle lighting system of claim 1 further including a means for adjusting an intensity of said beam produced by each of the plurality of light emitters, independent of the remaining semiconductor light emitters.

18. A vehicle lighting system comprising:

a plurality of semiconductor light emitters grouped together, each emitter adapted to generate a beam,

a plurality of optical loads mounted on a vehicle, and

means for transmitting at least one of said beams to each of said optical loads, with said plurality of emitters being in a fixed spatial relationship with respect to said transmitting means, each of said plurality of optical loads being uniquely associated with a subset of said plurality of emitters, with said subset of emitters being mutually exclusive of emitters forming subsets associated with the remaining optical loads.

19. The vehicle lighting system of claim 18 further including a plurality of input devices, with each of said plurality of input devices being uniquely associated with one of said plurality of optical loads and each of said plurality of optical loads being uniquely associated with one of said plurality of input devices, whereby each of said plurality or input devices activates a subset of said plurality of semiconductor light emitters optically coupled to said one of said plurality of optical loads.

20. The vehicle lighting system of claim 18 further including a plurality of input devices, with each of said input devices being associated with a plurality of optical loads, whereby each of said plurality of input devices activates a subset of said plurality of semiconductor light emitters optically coupled to said one of said optical loads.

21. The vehicle lighting system of claim 18 further including a means, positioned between one of said plurality of waveguides and one of said plurality of optical loads, for diffusing a beam exiting said one of said plurality of waveguides.

22. The vehicle lighting system of claim 18 further including multiplexing means, in data communication with said plurality of semiconductor light emitters, for individually addressing each of said plurality of emitters to generate said beam independent of the remaining semiconductor light emitters.

23. The vehicle lighting system of claim 22 wherein said multiplexing means includes a means for increasing a current through each of said plurality of semiconductor light emitters, wherein each of said plurality of semiconductor light emitters has the brightness of a beam emitted thereby adjusted to compensate for variations in beam intensity.

24. The vehicle lighting system of claim 18 further including means for modulating each of said plurality of semiconductor light emitters to create a flashing light, said flashing light transmitting data to a light receiver located away from the vehicle containing said modulating means.

25. The vehicle lighting system of claim 24 wherein said flashing light is amplitude modulated.

26. The vehicle lighting system of claim 18 wherein at least two of each of said plurality of semiconductor light emitters transmit a beam having a wavelength, different from the remaining emitters, to a single optical load.

27. The vehicle lighting system of claim 18 wherein at least two of said plurality of semiconductor light emitters transmit a beam having a wavelength, different from the remaining emitters, to different optical loads.

28. A vehicle lighting system comprising:

a plurality of semiconductor light emitters grouped together, each emitter adapted to generate a beam,

a plurality of optical loads mounted on a vehicle, and

means for transmitting at least one of said beams to each of said optical loads, with said plurality of emitters being in a fixed spatial relationship with respect to said transmitting means, said plurality of emitters comprised of a monolithic array of laser emitters distally positioned from each of said plurality of optical loads, each of said plurality of laser emitters being separately controllable from the others and separately coupled to said transmitting means, said transmitting means including a plurality of optical fibers, said plurality of optical fibers extending from a laser emitter and terminating proximate to an optical load, thereby transmitting said beam thereto.

29. The vehicle lighting system of claim 28 further including a means, positioned between one of said plurality of waveguides and one of said plurality of optical loads, for diffusing a beam exiting said one of said plurality of waveguides.

30. The vehicle lighting system of claim 28 further including multiplexing means, in data communication with said array of laser emitters, for individually addressing each of said laser emitters to generate said beam independent of the remaining laser emitters.

31. The vehicle lighting system of claim 30 wherein said multiplexing means includes a means for increasing a current through each of said laser emitters, wherein each laser emitter has the brightness of a beam emitted thereby adjusted to compensate for variations in beam intensity.

32. The vehicle lighting system of claim 28 further including means for modulating each of said laser emitters to create a flashing light, said flashing light transmitting data to a light receiver located away from the vehicle containing said modulating means.

33. The vehicle lighting system of claim 32 wherein said flashing light is amplitude modulated.

34. The vehicle lighting system of claim 28 wherein at least two laser emitters transmit a beam having a wavelength, different from the remaining emitters, to a single optical load.

35. The vehicle lighting system of claim 28 wherein at least two laser emitters transmit a beam having a wavelength, different from the remaining emitters, to different optical loads.

36. A vehicle lighting system comprising:

a plurality of optical loads mounted on a vehicle,

a plurality of grouped together laser light sources, each of which is adapted to produce a coherent beam of light, at least one of said plurality of laser light sources being separately controllable from the others,

a plurality of optical fibers each of which is optically coupled to receive said beam from at least one of said plurality of laser light sources, each of said plurality of fibers extending from a laser light source, terminating proximate to an optical load, wherein there is at least one fiber associated with each of said plurality of optical loads,

means, connected to said grouped together light sources, for individually driving at least one of said plurality of laser sources to produce said beam, and

a plurality of input switches connected to said driving means, whereby at least one of said plurality of laser light sources is associated with an input switch and said driving means and causes said laser light sources to transmit light in response to an activation of said input switch.

37. The vehicle lighting system of claim 36 wherein at least two of said plurality of light sources are optically coupled to each of said plurality of waveguides.

38. The vehicle lighting system of claim 36 further including means, connected to said plurality of grouped together laser light sources, for maintaining the temperature of said plurality of laser light sources at a predetermined temperature.

39. The vehicle lighting system of claim 36 wherein said plurality of grouped together light sources are a monolithic array of laser diodes.

40. The lighting system of claim 36 wherein each of said plurality of waveguides is an optical fiber.

41. The lighting system of claim 36 wherein each of said plurality of waveguides is a plurality of fibers bundled together.

42. The vehicle lighting system of claim 36 further including a means, positioned between each of said plurality of waveguides and each of said plurality of optical loads, for diffusing a beam exiting each of said plurality of waveguides.

43. The vehicle lighting system of claim 36 further including a means for adjusting an intensity of said beam produced by each of the plurality of laser light sources, independent of the remaining laser light sources.

44. A vehicle signaling apparatus comprising:

a plurality of optical loads mounted on a first vehicle,

a monolithic array of laser diodes distally positioned from each of said plurality of optical loads, said laser array including a plurality of laser emitters, each of which produces a beam of coherent light, at least one of said plurality of laser emitters being separately controllable from the others,

a plurality of fiber optic waveguides with at least two of said plurality of laser emitters optically coupled to each of said plurality of waveguides, each of said plurality of waveguides extending from said laser array and terminating proximate to an optical load, wherein there is at least one of said plurality of waveguides associated with each of said plurality of optical loads,

means, connected to said array, for individually driving at least one of said plurality of laser emitters to transmit light,

a plurality of input switches electronically coupled to said driving means to transmit a signal thereto upon activation, whereby at least one laser emitter associating with an input switch and said driving means causes said laser emitter to transmit light in response to said signal.

45. The vehicle lighting system of claim 44 wherein each of said plurality of waveguides includes an optical fiber.

46. The vehicle lighting system of claim 44 wherein each of said plurality of waveguides includes a plurality of optical fibers bundled together.

47. The vehicle lighting system of claim 44 wherein said plurality of optical loads comprises at least two optical loads from the group consisting of taillights, brake lights, instrumentation lights, a collision avoidance light and turn signals.

48. The vehicle lighting system of claim 47 further including a means, positioned between each of said plurality of waveguides and each of said plurality of optical loads, for diffusing a beam exiting each of said plurality of waveguides.

49. The vehicle lighting system of claim 48 wherein said driving means includes a means for increasing a current through each of said plurality of laser emitters, wherein each of said plurality of laser emitters has the brightness of a beam emitted thereby adjusted to compensate for variations in beam intensity.

50. The vehicle lighting system of claim 44 further including a means for adjusting an intensity of said beam produced by each of the laser diodes, independent of the remaining laser diodes.