Backlighting method for an automotive trim panel

• US 6,652,128 B2
• Filed: 01/31/2001
• Issued: 11/25/2003
• Est. Priority Date: 01/31/2001
• Status: Expired due to Term

• Current Assignee: LISA Draxlmaier GmbH
• Original Assignee: Textron Autmotive Company Inc.
• Inventors: Misaras, David M.
• Primary Examiner(s): CARIASO, ALAN B
• Application Number:
  US09/773,840
• Publication Number:
  US 20020101738A1
• Time in Patent Office: 1,028 Days
• Field of Search: 200/313-317, 362/23, 362/29, 362/85, 362/278, 362/311, 362/320, 362/488, 362/489, 362/540, 362/548, 362/456, 362/545, 405/79, 405/80, 405/56
• US Class Current: 362/488
• CPC Class Codes: B60K 2360/34 Backlit symbols
• CPC Class Codes: B60K 35/10 Input arrangements, i.e. from user to vehicle, associated with vehicle functions or specially adapted therefor
• CPC Class Codes: B60Q 3/14 lighting through the surface to be illuminated
• CPC Class Codes: B60Q 3/66 for distributing light among several lighting devices
• CPC Class Codes: B60Q 3/745 using lighting panels or mats, e.g. electro-luminescent panels, LED mats
• CPC Class Codes: G02B 6/0008 the light being emitted at the end of the fibre
• CPC Class Codes: H01H 2009/187 having symbols engraved or printed by laser
• CPC Class Codes: H01H 2219/058 Optical grid, collimator or microlouver
• CPC Class Codes: H01H 2219/062 Light conductor
• CPC Class Codes: H01H 2221/084 made at least partly of elastic foam
• CPC Class Codes: H01H 2231/026 Car

Abstract

The present invention relates to an apparatus and method of perforating the cover layer or soft skin of an automotive trim panel such as an instrument panel with a laser to allow light to bleed through the perforations. The light source would preferably be a low heat generating or “cool” type source such as an LED. The light source would be attached to a suitable substrate or incorporated in to a flexible printed circuit and coupled to the vehicle electrical system. This method would enable full switch integration to a trim panel and provide a seamless styling opportunity regarding the electrical controls. This method would help reduce cost and weight, improve quality, and promote new seamless styling theme.

Claims

1. An automotive trim panel, comprising:

a pliable cover layer having a front surface and a rear surface, the cover layer comprising a plurality of openings formed with a laser, said openings extending from the front surface to the rear surface, said openings of a size between 0.010″

-0.060″

;

a light source to direct light through the openings from the rear surface to the front surface;

an actuator beneath the rear surface of said cover layer, said actuator moveable between a first position and a second position; and

a switch to energize the light source wherein the actuator is spaced from the rear surface of the cover layer, the actuator causing the switch to change state when a force is applied to the cover layer.

2. The automotive trim panel of claim 1, wherein said pliable cover layer has an elongation over 150%.

3. The automotive trim panel of claim 1, wherein said pliable cover layer has a tensile strength below 5000 psi.

4. The automotive trim panel of claim 1, wherein said pliable cover layer has a Shore Hardness between 60-100A.

5. The automotive trim panel of claim 1, wherein said pliable cover layer is selected from the group consisting of leather, polyvinyl chloride, polyurethane, and cloth.

6. The automotive trim panel of claim 1, further comprising a coating on the plurality of openings extending from the front surface to the rear surface.

7. The automotive trim panel of claim 1, wherein the openings are formed in a shape selected from the group consisting of circles, squares, ovals, hexagons, pentagons, rectangles, stars, or mixture thereof.

8. The automotive trim panel of claim 1, wherein said opening is a circle shape of diameter 00.010-0.060″

.

9. The automotive trim panel of claim 6, wherein the coating is light transmissive.

10. The automotive trim panel of claim 9, wherein the coating is transparent.

11. The automotive trim panel of claim 1, wherein the light source is a light emitting diode.

12. The automotive panel of claim 1, further comprising a retainer layer to secure said trim panel to vehicle structure and a housing for holding the light source, said housing secured to the retainer layer by attachment means.

13. The automotive trim panel of claim 12, wherein the housing comprises conductive traces to couple the light source to vehicle wiring.

14. The automotive trim panel of claim 1, wherein the actuator has a plurality openings to allow light to travel from the light source through the actuator and through the openings in the cover layer.

15. A method of back lighting an automotive trim panel, comprising:

forming a plurality of openings with a laser in a pliable cover layer of the trim panel, said openings of a size between 0.010″

-0.060″

;

positioning a light source relative to the openings to allow light to exit through the openings and enter the vehicle compartment;

providing an actuator beneath the rear surface of the cover layer, said actuator moveable between a first position and a second position; and

providing a switch to energize the light source, wherein the actuator is spaced from the rear surface of the cover layer, the actuator causing the switch to change state when a force is applied to the cover layer.

16. The method of claim 15, wherein said pliable cover layer has an elongation over 150%.

17. The method of claim 15, wherein said pliable cover layer has a tensile strength below 5000 psi.

18. The method of claim 15, wherein said pliable cover layer has a Shore Harness between 60-100A.

19. The method of claim 15, further comprising the step of coating the plurality of openings with a light transmissive material.

20. The method of claim 15, wherein the openings are formed in a shape selected from the group consisting of circles, squares, ovals, triangles, hexagons, pentagons, rectangles, stars, or mixtures thereof.

21. The method of claim 20, wherein the diameter of the circle is in the range of 0.010-0.060″

.

22. The method of claim 15, wherein the openings formed are at an angle to a front surface of the cover layer.

23. The method of claim 15, wherein the openings formed are perpendicular to a front surface of the cover layer.

24. The method of claim 15, wherein the openings formed have a uniform cross sectional area.