Mirror coating

• US 5,619,375 A
• Filed: 10/17/1995
• Issued: 04/08/1997
• Est. Priority Date: 12/07/1993
• Status: Expired due to Fees

• Current Assignee: K W Muth Company Incorporated (K. W. Muth)
• Original Assignee: K W Muth Company Incorporated (K. W. Muth)
• Inventors: Roberts, John K.
• Primary Examiner(s): Shafer, Ricky D.
• Application Number:
  US08/544,064
• Time in Patent Office: 539 Days
• Field of Search: 359/359, 359/360, 359/580, 359/584, 359/585, 359/586, 359/588, 359/589, 359/883, 359/884, 359/613, 359/603, 359/608, 359/583, 359/839
• US Class Current: 359/584
• CPC Class Codes: B60Q 1/2665 on rear-view mirrors lighting devices for vehicle interior on or for rear-view mirrors B60Q3/258
• CPC Class Codes: B60R 1/08 involving special optical features, e.g. avoiding blind spots , e.g. convex mirrors; Side-by-side associations of rear-view and other mirrors B60R1/025, B60R1/10 take precedence
• CPC Class Codes: B60R 1/1207 with lamps; with turn indicators
• CPC Class Codes: B60R 2001/1223 with sensors or transducers
• CPC Class Codes: G02B 5/0833 comprising inorganic materials only
• CPC Class Codes: G02B 5/124 plural reflecting elements forming part of a unitary plate or sheet

Abstract

A mirror coating which provides improved performance characteristic to a mirror assembly, and which includes a non-periodic succession of materials which exhibit neutral reflected chromaticity, and which has a luminous reflectance of greater than 50%.

Claims

1. A mirror coating comprising a non-periodic succession of materials in a layered interference filter structure and wherein the mirror coating exhibits substantially neutral reflected chromaticity as observed with reflected ambient light, has a peak transmittance of not less than 60% within a predetermined spectral band pass region, has a peak absorbance of not less than 30% within a spectral region other than the predetermined spectral band pass region, and which simultaneously has a luminous reflectance of greater than 50% for the ambient light striking the mirror coating, and wherein the mirror coating comprises:

a first layer of ferric oxide having a thickness of about 95 nanometers;

a second layer of silicon dioxide having a thickness of about 35.50 nanometers;

a third layer of ferric oxide having a thickness dimension of about 51.50 nanometers;

a fourth layer of silicon dioxide having a thickness dimension of about 103.00 nanometers; and

a fifth layer of ferric oxide having a thickness dimension of about 22.50 nanometers.

2. A mirror coating as claimed in claim 1 and wherein the thickness of each of the individual layers may vary by about 2% or less.