	US 7,570,413 B2
	Vehicular rearview mirror elements and assemblies incorporating these elements
William L. Tonar, Holland, Mich. (US); David J. Cammenga, Zeeland, Mich. (US); John S. Anderson, Holland, Mich. (US); David L. Poll, Holland, Mich. (US); George A. Neuman, Holland, Mich. (US); Joel A. Stray, Hudsonville, Mich. (US); Bradley L. Busscher, Grand Rapids, Mich. (US); and Kenton J. Ypma, Hudsonville, Mich. (US)
Assigned to Gentex Corporation, Zeeland, Mich. (US)
Filed on May 08, 2008, as Appl. No. 12/151,669.
Application 12/151669 is a continuation of application No. 11/066903, filed on Feb. 25, 2005, granted, now 7,372,611.
Application 11/066903 is a continuation in part of application No. 10/430885, filed on May 06, 2003, granted, now 7,324,261.
Application 10/430885 is a continuation in part of application No. 10/260741, filed on Sep. 30, 2002, granted, now 7,064,882.
Prior Publication US 2008/0291523 A1, Nov. 27, 2008
Int. Cl. G02F 1/15 (2006.01); G02F 1/153 (2006.01)

U.S. Cl. 359—267 [359/265]

19 Claims

1. An apparatus comprising:

a first substantially transparent substrate having first and second surfaces and a spectral filter material proximate the second surface in at least a peripheral portion, said spectral filter material comprising at least one layer including chromium;

a second substrate having third and fourth surfaces and an at least partially reflective stack of materials on at least a portion of the third surface;

said first substantially transparent substrate and said second substrate secured in a spaced apart relation with respect to one another with said second surface and said third surface facing one another,

wherein said at least one layer including chromium is characterized by a refractive index, at approximately 550 nm, comprising n between approximately 2.7 and approximately 4.1, k between approximately 3.5 and approximately 4.5, and a ratio of n/k between 0.64 and 0.93.