THIN FILM COATING FOR SUNGLASSES

• US 3,516,720 A
• Filed: 03/04/1968
• Issued: 06/23/1970
• Est. Priority Date: 03/04/1968
• Status: Expired due to Term

• Current Assignee: Mauer Paul Bernard
• Original Assignee: Mauer Paul Bernard
• Inventors: MAUER PAUL BERNARD
• Application Number:
  US04/715,464
• Time in Patent Office: 841 Days
• US Class Current: 359/360
• CPC Class Codes: A61F 9/022 Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs optical filters per se G02B5/20
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/361 Coatings of the type glass/metal/inorganic compound/metal/inorganic compound/other
• CPC Class Codes: C03C 17/3628 one layer at least containing a sulfide
• CPC Class Codes: C03C 17/3642 the multilayer coating containing a metal layer
• CPC Class Codes: C03C 17/3649 made of metals other than silver
• CPC Class Codes: C03C 17/3652 the coating stack containing at least one sacrificial layer to protect the metal from oxidation
• CPC Class Codes: C03C 17/3657 the multilayer coating having optical properties
• CPC Class Codes: G02B 5/281 designed for the infrared light
• CPC Class Codes: G02C 2202/16 Laminated or compound lenses
• CPC Class Codes: G02C 7/10 Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses

Abstract

1,265,831. Optical filters. EASTMAN KODAK CO. Feb. 27, 1969 [March 4, 1968], No.10481/69. Heading G2J. [Also in Division C7] An optical filter, particularly for use in sunglasses, comprises a gold or copper foil 12 sandwiched between two transparent layers 14, 16, to filter I.R. and U.V. radiation from one side of the filter, and a metal, semi-metal or alloy layer 18, having a complex refractive index whose real part is within a factor of 10 of its imaginary part, to reduce reflection from the other side of the filter. The various layers 12, 14, 16 and 18 are successively deposited on a plastics or glass substrate 20 by vacuum distillation, or in the case of the gold or copper foil by cathodic sputtering, electrolysis or chemical methods. The order of deposition may be reversed, Fig. (not shown) and a protective plastics or glass layer may be provided at the side remote from the substrate, Figs.5 and 6 (not shown). The layers 14, 16 may consist of the oxides of titanium, lead or bismuth or zinc sulphide, and the layer 18 may be constituted by Ni, Fe, Cr, Ti, Al, La, In, Sn, Pb, Ta, W, Co, Mo, Os, Ir, Pt, Yt, Zr, Ni, Zn, Cd, V, Hf, Re, Tl, Si, Ge, As, Sb, or Te or an alloy or any two or more thereof.

Claims