Environmentally safe electrochromic mirrors

• US 7,733,555 B2
• Filed: 06/15/2006
• Issued: 06/08/2010
• Est. Priority Date: 06/17/2005
• Status: Active Grant

• Current Assignee: Ajjer, LLC
• Original Assignee: Electro Chromix Incorporated
• Inventors: Agrawal, Anoop, Cronin, John P., Tonazzi, Juan Carlos Lopez
• Primary Examiner(s): Thompson; Timothy J
• Application Number:
  US11/454,055
• Publication Number:
  US 20060285190A1
• Time in Patent Office: 1,454 Days
• Field of Search: 359/265, 359/267, 359/268, 359/270, 359/245, 359/238
• US Class Current: 359/265
• CPC Class Codes: B60R 1/088 using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors
• CPC Class Codes: G02F 1/153 Constructional details

Abstract

This invention recognizes the hazards of beryllium and beryllium oxide in automotive applications and offers alternative material solutions. In particular, commercial electrochromic mirrors use beryllium comprising alloys for busbars and may also use beryllium oxide for the electronics used to power and control these mirrors. Further, this can be combined by reducing other known hazards such as mercury, cadmium, lead and antimony compounds.

Claims

1. An environmentally improved rearview mirror assembly, comprising:

an electrical control circuit with at least one light transducer and a variable reflective element that is in communication with the electrical control circuit;

wherein the assembly is substantially free of beryllium, and is also substantially free of lead, cadmium, and mercury.

2. An environmentally improved rearview mirror assembly, comprising:

an electrical control circuit with at least one light transducer and a variable reflective element that is in communication with the electrical circuit;

wherein the assembly uses busbar clips that are substantially free of beryllium and the assembly is substantially free of lead, cadmium, and mercury.

3. A single compartment electrochromic mirror assembly, wherein the assembly comprises a rear element and a transparent front element being sealably bonded together in a spaced apart relationship to define a chamber, and a solid electrolyte material contained in the said chamber, wherein the said solid electrolyte includes a multiphase solid formed by cooling a low viscosity fluid that has a viscosity less than 1,000 cP.

4. A single compartment electrochromic mirror assembly as in claim 3 where the solvent in the electrolyte is substantially non-ionic.

5. An electro-optically dimming rearview mirror for motor vehicles, said mirror comprising, in combination, front and rear spaced elements, said front element and said rear element defining a chamber therebetween sealed by a perimeter seal and powered by busbars, where the said front element of the mirror perimeter is coated with a reflective layer so as to hide from the user said perimeter seal and the busbar where the said reflective layer is accented so that its color is different from the said mirror in the bleached state and the color difference can be characterized on L*a*b* color chart as a difference in at least one of L* value of greater than 25 and a C* value greater than 15.

6. An electro-optically dimming rearview mirror for motor vehicles, said mirror comprising, in combination, front and rear spaced elements, said front element and said rear element defining a chamber therebetween sealed by a perimeter seal, wherein the said perimeter sealant is electrically conductive and configured to provide separate electronic communication with each of the front and rear elements;

and the said conductive perimeter sealant in communication with the front element is electronically separated from the said conductive perimeter sealant in communication with the rear element by an electronically insulating adhesive.

8. An electro-optically dimming rearview mirror for motor vehicles as in claim 6, wherein the said conductive perimeter sealant comprises conductive particles of at least one of nickel, nickel coated silver, silver-palladium alloy, platinum, gold, nickel coated graphite fibers, conductive carbons and graphite including carbon multi-wall nanotubes and carbon single-wall nanotubes.

7. An electro-optically dimming rearview mirror for motor vehicles, said mirror comprising,

a. in combination, front and rear spaced elements wherein each of these elements have a conductive coating,

b. said front element and said rear element defining a chamber therebetween with the said conductive coatings facing inside the chamber,

c. further the said conductive coatings having part of their perimeter coated with an additional electrically insulative material

d. and the chamber perimeter sealed by a perimeter seal, wherein the said perimeter sealant is electrically conductive and configured to provide separate electronic communication with each of the front and rear elements, and

e. the said conductive perimeter sealant in communication with the front element is electronically separated from the said conductive perimeter sealant in communication with the rear element by an electronically insulating adhesive.