Fluorescing keypad

• US 5,477,430 A
• Filed: 03/14/1995
• Issued: 12/19/1995
• Est. Priority Date: 03/14/1995
• Status: Expired due to Term

• Current Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Original Assignee: Delco Electronics Corporation (General Motors Company)
• Inventors: LaRose, Charles W.
• Primary Examiner(s): Husar, Stephen F.
• Application Number:
  US08/404,387
• Time in Patent Office: 280 Days
• Field of Search: 362/23, 362/24, 362/29, 362/30, 362/88, 362/84, 362/260, 362/806, 362/812, 40/542, 40/543, 200/314
• US Class Current: 362/84
• CPC Class Codes: G09F 13/20 with luminescent surfaces or parts luminescent compositions C09K11/00; light sources using luminescence F21K2/00
• CPC Class Codes: H01H 9/185 Fluorescent or phosphorescent symbols or distinguishing marks H01H9/181 takes precedence

Abstract

A backlit component is provided which is suitable for use in an illuminated graphic display in an instrument panel of an automobile. The backlit component can be formed as a molded plastic button for use in a display group forming a keypad, in which minimal variability of backlighting intensity can be readily achieved within the backlit component as well as within the display group. The backlit component is preferably molded from a translucent substrate in which at least one phosphor additive is dispersed. The phosphor additive is preferably uniformly dispersed such that the backlit component is characterized by a substantially uniform backlighting intensity upon the phosphor additive being excited by an appropriate light source in proximity to the backlit component. The light source can be received within a recess formed in the backlit component, or spaced apart from the component, in which case light emitted by the light source may be transmitted by a recess or light pipe integrally formed in the component. An insignia can be formed on the surface of the component, and phosphors capable of fluorescing in different colors can be combined to produce essentially any backlighting color.

Claims

1. A backlit component having a substantially uniform backlighting intensity, the backlit component including a button member comprising an optically clear silicone and at least one phosphor additive dispersed in a portion of the button member, the button member having means for enabling a light source in proximity to the button member to excite the at least one phosphor additive such that the button member will fluoresce when excited by the light source, the at least one phosphor additive generating a substantially uniform backlighting intensity.

2. A backlit component as recited in claim 1 wherein the at least one phosphor additive is dispersed in the optically clear silicone.

3. A backlit component as recited in claim 1 further comprising a coating over the button member.

4. A backlit component as recited in claim 3 further comprising an insignia defined by an opening in the coating, such that a portion of the button member is exposed through the opening.

5. A backlit component as recited in claim 1 further comprising a light source for exciting the at least one phosphor additive.

6. A backlit component as recited in claim 5 wherein the light source is received in the enabling means.

7. A backlit component as recited in claim 5 wherein light emitted by the light source is transmitted by the enabling means to the button member.

8. A backlit component having a substantially uniform backlighting intensity, the backlit component comprising:

a button member formed of at least one phosphor additive dispersed in an optically clear silicone, the at least one phosphor additive being substantially uniformly dispersed in the optically clear silicone such that, upon excitation of the at least one phosphor additive, the button member is characterized by a substantially uniform backlighting intensity;

an insignia defined on a surface of the button member; and

a light source in proximity to the button member for exciting the at least one phosphor additive such that the button member will appear to emit light when the at least one phosphor is excited by the light source.

9. A backlit component as recited in claim 8 further comprising a coating over the button member.

10. A backlit component as recited in claim 9 wherein the insignia is defined by an opening in the coating, such that a portion of the button member is exposed through the opening.

11. A backlit component as recited in claim 9 wherein the coating is formed from a material comprising a blend of one or more of the at least one phosphor additive and a carrier.

12. A backlit component as recited in claim 8 wherein the light source is an ultraviolet light source.

13. A backlit component as recited in claim 8 further comprising a recess formed in the button member, the light source being received in the recess.

14. A backlit component as recited in claim 8 further comprising a recess formed in the button member, wherein light emitted by the light source is transmitted by the recess to the button member.

15. A backlit component having a substantially uniform backlighting intensity, the backlit component comprising:

a button member formed of at least one phosphor additive dispersed in an optically clear silicone, the at least one phosphor additive being substantially uniformly dispersed in the optically clear silicone such that, upon excitation of the at least one phosphor additive, the button member is characterized by a substantially uniform backlighting intensity;

a coating disposed on at least a portion of the button member so as to define an insignia with an exposed portion of the button member; and

a ultraviolet light source in proximity to the button member to excite the at least one phosphor additive such that the button member will appear to emit light when the at least one phosphor is excited by the light source.

16. A backlit component as recited in claim 15 wherein the coating is formed from a material comprising a blend of one or more of the at least one phosphor additive and a carrier.

17. A backlit component as recited in claim 15 wherein the coating is composed of a plurality of coatings.

18. A backlit component as recited in claim 15 further comprising a recess formed in the button member, the light source being received in the recess.

19. A backlit component as recited in claim 15 further comprising a recess formed in the button member, wherein light emitted by the light source is transmitted by the recess to the button member.

20. A backlit component as recited in claim 15 wherein the at least one phosphor additive comprises a plurality of phosphor additives, and wherein at least one of the plurality of phosphor additives emits a light whose color differs from that of a second phosphor additive of the plurality of phosphor additives.