Heater pad for a mirror reflective element

• US 7,910,859 B2
• Filed: 09/17/2010
• Issued: 03/22/2011
• Est. Priority Date: 01/19/2005
• Status: Expired due to Fees

• Current Assignee: Donnelly Corporation (Magna International Incorporated)
• Original Assignee: Donnelly Corporation (Magna International Incorporated)
• Inventors: Habibi, Hamid, McCabe, Ian A., Byers, Donald C., Lynam, Niall R.
• Primary Examiner(s): Fuqua; Shawntina
• Application Number:
  US12/884,292
• Publication Number:
  US 20110013280A1
• Time in Patent Office: 186 Days
• Field of Search: 219/219, 359/871, 359/872, 359/883
• US Class Current: 219/219
• CPC Class Codes: B60R 1/088 using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors
• CPC Class Codes: G02B 7/1815 with cooling or heating systems cooling arrangements for laser mirrors H01S3/0401

Abstract

A heater pad for a variable reflectance mirror reflective element of a vehicular mirror assembly includes a flexible substrate, an electrically conductive heating element, and first and second electrically conducting elements. The first electrically conducting element is in electrical connection with a transparent second surface electrically conductive coating of the equipped mirror reflective element and the second electrically conducting element is in electrical connection with a third surface electrically conductive coating of the equipped mirror reflective element when the equipped mirror reflective element is normally equipped with the heater pad. The electrically conducting elements and the heating element are electrically isolated from one another. The heating element and the first and second electrically conducting elements terminate at an electrical connector that is configured to electrically conductively connect with a wire harness that provides electrical connection to at least one of a power source and a control circuit.

Claims

1. A heater pad suitable for use for an electro-optical variable reflectance mirror reflective element of a vehicular mirror assembly, the electro-optical variable reflectance vehicular mirror reflective element having a front substrate and a rear substrate with an electro-optic medium established therebetween, wherein the front substrate has a first surface and a second surface, the second surface having a transparent second surface electrically conductive coating disposed thereon, and wherein the rear substrate has a third surface and a fourth surface, the third surface having a third surface electrically conductive coating disposed thereon, said heater pad comprising:

a flexible substrate having an attaching surface for attaching at the fourth surface of the electro-optical variable reflectance mirror reflective element equipped with said heater pad;

an electrically conductive heating element, said electrically conductive heating element generating heat when electrically powered;

first and second electrically conducting elements, wherein said first electrically conducting element is in electrical connection with the transparent second surface electrically conductive coating disposed at the second surface of the front substrate of the equipped mirror reflective element when the mirror reflective element is normally equipped with said heater pad, and wherein said second electrically conducting element is in electrical connection with the third surface electrically conductive coating disposed at the third surface of the rear substrate of the equipped mirror reflective element when the equipped mirror reflective element is normally equipped with said heater pad;

wherein said first and second electrically conducting elements and said heating element are electrically isolated from one another;

wherein said heating element and said first and second electrically conducting elements terminate at an electrical connector at said heater pad; and

wherein said electrical connector is configured to electrically conductively connect with a wire harness that provides electrical connection to at least one of a power source and a control circuit.

2. The heater pad of claim 1, wherein said first and second electrically conducting elements and said heating element comprise at least one of (a) an electrically conductive fit, (b) an electrically conductive epoxy, (c) an electrically conductive ink, (d) an electrically conductive paste, (e) an electrically conductive silver fit, (f) an electrically conductive silver containing material, (g) an electrically conductive metallic material and (h) an electrically conductive graphite material.

3. The heater pad of claim 1, wherein the wire harness provides electrical connection to a power source and a control circuit.

4. The heater pad of claim 1, wherein the wire harness provides electrical connection to a power source and wherein the power source comprises an ignition voltage source of a vehicle equipped with the mirror reflective element that is equipped with said heater pad.

5. The heater pad of claim 4, wherein the wire harness provides electrical connection to a control circuit and wherein the control circuit comprises an electro-optic control circuit operable to vary the reflectance of the equipped electro-optical variable reflectance mirror reflective element.

6. The heater pad of claim 5, wherein the wire harness comprises a wire harness of the vehicular mirror assembly equipped with the mirror reflective element that is equipped with said heater pad.

7. The heater pad of claim 5, wherein the wire harness comprises a wire harness of a vehicle equipped with the equipped mirror reflective element.

8. The heater pad of claim 1, wherein said electrical connector is accessible at a rear surface of said flexible substrate opposite said attaching surface.

9. The heater pad of claim 1, wherein said first electrically conductive element is at least partially established at said attaching surface of said flexible substrate for electrically connecting to a first electrically conductive contact at the fourth surface of the rear substrate of the equipped mirror reflective element when said heater pad is attached at the fourth surface of the rear substrate of the equipped mirror reflective element, and wherein said second electrically conductive element is at least partially established at said attaching surface of said flexible substrate for electrically connecting to a second electrically conductive contact at the fourth surface of the rear substrate of the equipped mirror reflective element when said heater pad is attached at the fourth surface of the rear substrate of the equipped mirror reflective element.

10. The heater pad of claim 9, wherein said first electrically conducting element connects to the first electrically conductive contact at the fourth surface of the rear substrate of the equipped mirror reflective element such that electrically conductive continuity is established between said first electrically conducting element and the first electrically conductive contact when said heater pad is attached at the fourth surface of the equipped mirror reflective element, and wherein said second electrically conducting element connects to the second electrically conductive contact at the fourth surface of the rear substrate of the equipped mirror reflective element such that electrically conductive continuity is established between said second electrically conducting element and the second electrically conductive contact when said heater pad is attached at the fourth surface of the equipped mirror reflective element.

11. A heater pad suitable for use for an electro-optical variable reflectance mirror reflective element of a vehicular mirror assembly, the electro-optical variable reflectance vehicular mirror reflective element having a front substrate and a rear substrate with an electro-optic medium established therebetween, wherein the front substrate has a first surface and a second surface, the second surface having a transparent second surface electrically conductive coating disposed thereon, and wherein the rear substrate has a third surface and a fourth surface, the third surface having a third surface electrically conductive coating disposed thereon, said heater pad comprising:

a flexible substrate having an attaching surface for attaching at the fourth surface of the electro-optical variable reflectance mirror reflective element equipped with said heater pad, wherein said flexible substrate comprises a flexible polymeric element;

an electrically conductive heating element, said electrically conductive heating element generating heat when electrically powered;

first and second electrically conducting elements, wherein said first electrically conducting element is in electrical connection with the transparent second surface electrically conductive coating disposed at the second surface of the front substrate of the equipped mirror reflective element when the mirror reflective element is normally equipped with said heater pad, and wherein said second electrically conducting element is in electrical connection with the third surface electrically conductive coating disposed at the third surface of the rear substrate of the equipped mirror reflective element when the equipped mirror reflective element is normally equipped with said heater pad;

wherein said first and second electrically conducting elements and said heating element are electrically isolated from one another;

wherein said heating element and said first and second electrically conducting elements terminate at an electrical connector at said heater pad; and

wherein said electrical connector is configured to electrically conductively connect with a wire harness that provides electrical connection to at least one of a power source and a control circuit.

12. The heater pad of claim 11, wherein said flexible polymeric element has a thickness of between about 0.001 inch and about 0.050 inch.

13. The heater pad of claim 12, wherein said heating element comprises at least one of (a) an electrically conductive frit, (b) an electrically conductive epoxy, (c) an electrically conductive ink, (d) an electrically conductive paste, (e) an electrically conductive silver frit, (f) an electrically conductive silver containing material, (g) an electrically conductive metallic material and (h) an electrically conductive graphite material.

14. The heater pad of claim 13, wherein said first and second electrically conducting elements comprise at least one of (a) an electrically conductive frit, (b) an electrically conductive epoxy, (c) an electrically conductive ink, (d) an electrically conductive paste, (e) an electrically conductive silver fit, (f) an electrically conductive silver containing material, (g) an electrically conductive metallic material and (h) an electrically conductive graphite material.

15. The heater pad of claim 11, wherein said flexible polymeric element comprises a polyester material.

16. The heater pad of claim 11, wherein said electrical connector is configured to electrically conductively connect with a wire harness of the vehicular mirror assembly equipped with the mirror reflective element that is equipped with said heater pad, and wherein said electrical connector is accessible at a rear surface of said flexible substrate opposite said attaching surface.

17. A heater pad suitable for use for an electro-optical variable reflectance mirror reflective element of a vehicular mirror assembly, the electro-optical variable reflectance vehicular mirror reflective element having a front substrate and a rear substrate with an electro-optic medium established therebetween, wherein the front substrate has a first surface and a second surface, the second surface having a transparent second surface electrically conductive coating disposed thereon, and wherein the rear substrate has a third surface and a fourth surface, the third surface having a third surface electrically conductive coating disposed thereon, and wherein the electro-optical variable reflectance vehicular mirror reflective element comprises an electrochromic variable reflectance vehicular mirror reflective element and wherein the electro-optic medium comprises an electrochromic medium, said heater pad comprising:

a flexible substrate having an attaching surface for attaching at the fourth surface of the electrochromic variable reflectance mirror reflective element equipped with said heater pad, wherein said flexible substrate comprises a flexible polymeric element, and wherein said attaching surface adhesively attaches at the fourth surface when said flexible substrate is attached at the fourth surface of the equipped mirror reflective element;

an electrically conductive heating element, said electrically conductive heating element generating heat when electrically powered;

first and second electrically conducting elements, wherein said first electrically conducting element is in electrical connection with the transparent second surface electrically conductive coating disposed at the second surface of the front substrate of the equipped mirror reflective element when the mirror reflective element is normally equipped with said heater pad, and wherein said second electrically conducting element is in electrical connection with the third surface electrically conductive coating disposed at the third surface of the rear substrate of the equipped mirror reflective element when the equipped mirror reflective element is normally equipped with said heater pad;

wherein said first and second electrically conducting elements and said heating element are electrically isolated from one another;

wherein said heating element and said first and second electrically conducting elements terminate at an electrical connector at said heater pad; and

wherein said electrical connector is configured to electrically conductively connect with a wire harness that provides electrical connection to at least one of a power source and a control circuit, and wherein the wire harness comprises a wire harness of the vehicular mirror assembly equipped with the mirror reflective element that is equipped with said heater pad.

18. The heater pad of claim 17, wherein said attaching surface adhesively attaches at the fourth surface of the equipped mirror reflective element via a pressure sensitive adhesive disposed at said attaching surface.

19. The heater pad of claim 18, wherein the wire harness provides electrical connection to a power source and wherein the power source comprises an ignition voltage source of a vehicle equipped with the mirror reflective element that is equipped with said heater pad, and wherein the wire harness provides electrical connection to a control circuit and wherein the control circuit comprises an electrochromic control circuit operable to vary the reflectance of the equipped electrochromic variable reflectance mirror reflective element.

20. The heater pad of claim 19, wherein said first and second electrically conducting elements and said heating element comprise at least one of (a) an electrically conductive frit, (b) an electrically conductive epoxy, (c) an electrically conductive ink, (d) an electrically conductive paste, (e) an electrically conductive silver frit, (f) an electrically conductive silver containing material, (g) an electrically conductive metallic material and (h) an electrically conductive graphite material.