Vehicle lighting system utilizing a uniform thickness thin sheet optical element

• US 5,791,757 A
• Filed: 04/01/1997
• Issued: 08/11/1998
• Est. Priority Date: 04/01/1997
• Status: Expired due to Term

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Fohl, Timothy, Remillard, Jeffrey Thomas, Marinelli, Michael Anthony, O'Neil, David Allen
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): Lam, Nhat-Hang H.
• Application Number:
  US08/831,099
• Time in Patent Office: 497 Days
• Field of Search: 362/26, 362/31, 362/32, 362/330, 362/327, 362/61, 362/80
• US Class Current: 362/556
• CPC Class Codes: B60Q 1/0011 with light guides for distributing the light between several lighting or signalling devices
• CPC Class Codes: F21S 43/14 Light emitting diodes [LED]
• CPC Class Codes: F21S 43/237 rod-shaped
• CPC Class Codes: F21S 43/245 emitting light from one or more of its major surfaces
• CPC Class Codes: F21S 43/249 with two or more light sources being coupled into the light guide
• CPC Class Codes: F21V 5/002 using microoptical elements for redirecting or diffusing light
• CPC Class Codes: G02B 6/0026 Wavelength selective element, sheet or layer, e.g. filter or grating
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G03H 1/2202 Reconstruction geometries or arrangements

Abstract

A lighting system for an automotive vehicle includes a remote laser light source coupled with a light transmitting fiber optic light guide bundle which illuminates a uniform thickness thin sheet optical element having a plurality of micro-optical wedges formed thereon and a plurality of diffractive optical elements disposed intermediate the fiber optic light guide bundle and the uniform thickness thin sheet optical element for receiving light and redirecting the light to predetermined regions of the plurality of micro-optical wedges.

Claims

1. A vehicle lighting system for use in an automotive vehicle, comprising:

a uniform thickness thin sheet optical element having a front surface, a back surface with a plurality of micro-optical wedges formed thereon for receiving and reflecting light through the front surface, and at least one perimeter side surface generally normal to the front surface;

a plurality of laser light sources for generating light disposed at a predetermined location adjacent a single perimeter side surface; and

at least one planar, diffractive optical element thin sheet grating disposed intermediately of said light source and the perimeter side surface, and being parallel to the single perimeter side surface, for receiving light from said laser light source and redirecting the light through the perimeter side surface and to predetermined regions of the plurality of micro-optical wedges.

2. A vehicle lighting system according to claim 1, wherein the redirected light passing through the perimeter side surface reflects off the front surface before being directed to the predetermined regions of the plurality of micro-optical wedges.

3. A vehicle lighting system according to claim 1, wherein said uniform thickness thin sheet optical element is comprised of a polymeric transparent optical material.

4. A vehicle lighting system according to claim 1, wherein said uniform thickness thin sheet optical element has a thickness between 10 μ

m-6 mm.

5. A vehicle lighting system according to claim 1, wherein said uniform thickness thin sheet optical element has a substantially planar cross-section.

6. A vehicle lighting system according to claim 1, wherein said uniform thickness thin sheet optical element has a predetermined curved cross-section.

7. A vehicle lighting system according to claim 1, wherein said uniform thickness thin sheet optical element is an outer lens for a vehicle lamp.

8. A vehicle lighting system for use in an automotive vehicle, said vehicle lighting system comprising:

a plurality of laser light sources for generating light;

a uniform thickness thin sheet optical element having a front surface, a back surface having a plurality of micro-optical wedges formed thereon for receiving and reflecting light through the front surface, and at least one perimeter side surface generally normal to the front surface; and

a plurality of thin sheet diffractive optical element gratings disposed along a single perimeter side surface, intermediate a corresponding laser light source and the single perimeter side surface, for receiving laser light and redirecting diffracted laser light through the perimeter side surface and to predetermined regions of the plurality of micro-optical wedges.

9. A vehicle lighting system according to claim 8, wherein the redirected light passing through the perimeter side surface reflects off the front surface before being directed to the predetermined regions of the plurality of micro-optical wedges.

10. A vehicle lighting system according to claim 8, wherein said uniform thickness thin sheet optical element is comprised of a polymeric transparent optical material.

11. A vehicle lighting system according to claim 8, wherein said uniform thickness thin sheet optical element has a thickness between 10 μ

m-6 mm.

12. A vehicle lighting system according to claim 8, wherein said uniform thickness thin sheet optical element has a substantially planar cross-section.

13. A vehicle lighting system according to claim 8, wherein said uniform thickness thin sheet optical element has a predetermined curved cross-section.