US Patent No. 9,073,490

METHOD OF COATING A REAR GLASS SUBSTRATE FOR AN ELECTROCHROMIC MIRROR REFLECTIVE ELEMENT


Patent No. 9,073,490
Issue Date July 07, 2015
Title Method Of Coating A Rear Glass Substrate For An Electrochromic Mirror Reflective Element
Inventorship John T. Uken, Jenison, MI (US)
Michael J. Baur, Holland, MI (US)
Ian A. McCabe, Holland, MI (US)
Hamid Habibi, Holland, MI (US)
Assignee MAGNA MIRRORS OF AMERICA, INC., Holland, MI (US)

Claim of US Patent No. 9,073,490

1. A method of coating a rear glass substrate for an electrochromic reflective element of a rearview mirror assembly of a
vehicle, said method comprising:
providing a fixture, said fixture comprising a recess shaped to receive a rear glass substrate therein;
wherein said fixture comprises a masking element extending from a perimeter region of said recess over a portion of said recess,
and wherein said masking element comprises a disc portion and an arm portion extending between said disc portion and said
perimeter region of said recess of said fixture;

positioning a rear glass substrate in said recess, said rear glass substrate having a surface exposed at said fixture for
coating of said surface during a vacuum coating process;

wherein, with said rear glass substrate received in said recess, said masking element extends over a portion of said surface
of said rear glass substrate and is spaced from said surface of said rear glass substrate;

coating said surface of said rear glass substrate with a mirror reflector coating via the vacuum coating process, wherein
coating of said surface comprises sputter deposition in a vacuum deposition chamber of said mirror reflector coating at said
surface of said rear glass substrate;

wherein said arm portion and said disc portion are shaped such that said mirror reflector coating is deposited at said surface
of said rear glass substrate behind said arm portion but is substantially not deposited behind said disc portion so as to
establish a window region through said mirror reflector coating at said surface of said rear glass substrate; and

removing said coated rear glass substrate from said fixture, wherein said mirror reflector coating is substantially mirror
reflecting at said surface of said coated rear glass substrate except at said window region.