Floating visible indicator for an instrument cluster

• US 20030107497A1
• Filed: 10/17/2002
• Published: 06/12/2003
• Est. Priority Date: 12/07/2001
• Status: Active Grant

• Current Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Krenz, Andrew R., Bolognino, David
• Granted Patent: US 7,030,774 B2
• Time in Patent Office: Days
• US Class Current: 340/815.4
• CPC Class Codes: G08B 5/36 using visible light sources

Abstract

A visible indicator for an instrument cluster is backlit with an electroluminescent (EL) film. A mounting plate is located a first distance from a light source and includes a first aperture. A translucent lens is located adjacent to the mounting plate. An EL film is located adjacent to the translucent lens and includes a second aperture having a laser-cut first shape. A lens is located a second distance from the EL film and includes a sandblasted inner surface facing the EL film.

Claims

1. A visible indicator for an instrument cluster that is backlit with an electroluminescent (EL) film, comprising:

a light source;

a mounting plate located adjacent to said light source and including a first aperture;

a translucent lens located adjacent to said mounting plate;

an EL film located adjacent to said translucent lens with a second aperture having a first shape; and

a lens that is located a second distance from said EL film and includes an inner surface facing said EL film that is sandblasted.

2. The visible indicator of claim 1 wherein said light source is located in a housing.

3. The visible indicator of claim 2 wherein said housing includes a non-reflective inner surface material to prevent secondary reflections from said light source.

4. The visible indicator of claim 1 wherein said light source is an incandescent light bulb with a filament.

5. The visible indicator of claim 4 wherein said incandescent light bulb is mounted with said filament aligned with a plane through a line of sight of an observer to prevent double images.

6. The visible indicator of claim 1 wherein a first distance between said EL film and said light source is related to a desired size of said first shape that is projected on said lens when said light source is on.

7. The visible indicator of claim 1 wherein said translucent lens is tinted a color related to a desired color for said visible indicator.

8. The visible indicator of claim 1 wherein said second aperture in said EL film is laser cut.

9. The visible indicator of claim 1 wherein said inner surface of said lens hides said second aperture formed in said EL film.

10. The visible indicator of claim 1 wherein said first shape that is projected on said lens appears to float behind said lens and in front of said EL film when said light source is on.

11. The visible indicator of claim 1 wherein said lens is tinted to tune said EL film to a first desired color when said EL film is illuminated and provides a second desired color of said instrument cluster when said EL film is not illuminated.

12. The visible indicator of claim 1 wherein said lens is made of polypropylene.

13. A method for displaying a visible indicator on an instrument cluster that is backlit with an electroluminescent (EL) film, comprising:

forming a first aperture in a mounting plate;

locating said mounting plate adjacent to a light source;

positioning a translucent lens adjacent to said mounting plate;

positioning an EL film adjacent to said translucent lens;

forming a second aperture having a first shape in said EL film;

sandblasting an inner surface of a lens; and

positioning said lens a second distance from said EL film with said inner surface facing said EL film.

14. The method of claim 13 further comprising locating said light source in a housing.

15. The method of claim 14 further comprising providing a non-reflective inner surface on said housing to prevent secondary reflections from said light source.

16. The method of claim 13 wherein said light source is an incandescent light bulb with a filament.

17. The method of claim 16 further comprising mounting said incandescent light bulb with said filament aligned with a plane through a line of sight of an observer to prevent double images.

18. The method of claim 13 wherein said translucent lens is tinted a color related to a desired color for said visible indicator.

19. The method of claim 13 further comprising laser cutting said second aperture in said EL film.

20. The method of claim 13 wherein said first shape projected on said lens appears to float behind said lens and in front of said EL film when said light source is on.

21. The method of claim 13 whether said lens is tinted to tune said EL film to a first desired color when said EL film is illuminated and provides a second desired color of said instrument cluster when said EL film is non-illuminated.

22. The method of claim 13 wherein said lens is made of polypropylene.

23. A visible indicator for an instrument cluster backlit with electroluminescent (EL) film comprising:

a housing having a non-reflective inner surface;

an incandescent light bulb with a filament located in said housing;

a mounting plate located adjacent to said light source and including a first aperture;

a translucent lens located adjacent to said mounting plate;

an EL film located adjacent to said translucent lens with a second aperture having a first shape that is laser cut; and

a lens that is located a second distance from said EL film and includes a sandblasted inner surface facing said EL film,

wherein said first shape projected on said lens appears to float behind said lens and in front of said EL film when said incandescent light bulb is on.