Ultraviolet transmitting multi-layer polarizer

• US 5,359,498 A
• Filed: 10/21/1992
• Issued: 10/25/1994
• Est. Priority Date: 10/21/1992
• Status: Expired due to Term

• Current Assignee: Daniel N. Karpen
• Original Assignee: Daniel N. Karpen
• Inventors: Karpen, Daniel N.
• Primary Examiner(s): Husar, Stephen F.
• Application Number:
  US07/964,656
• Time in Patent Office: 734 Days
• Field of Search: 362/1, 362/2, 362/19
• US Class Current: 362/19
• CPC Class Codes: F21V 9/14 for producing polarised light
• CPC Class Codes: G02B 5/3075 for use in the UV G02B5/3066 takes precedence

Abstract

An improvement in a multi-layer polarized light control panel comprising an ultraviolet transmitting acrylic supporting structure. Prior art multi-layer polarized light control panels are made with an ultraviolet absorbing acrylic supporting sheet, which blocks most ultraviolet light below 380 nanometers. Thus, the ultraviolet light which is emitted by fluorescent lamps, and in particular by specially formulated fluorescent lamps to provide so called "full-spectrum" light, is blocked by the prior art polarized light control panels. Use of an ultraviolet transmitting acrylic supporting sheet would permit the transmission of the ultraviolet light emitted from the lamp through the acrylic supporting sheet, which would then be polarized by the multi-layer polarized light control panel. The light diffusing polarized control panel can also be manufactured with an ultraviolet transmitting acrylic, providing a multi-layer polarizer of unsurpassed visual comfort probability. Transmission of ultraviolet light through the multi-layer polarized control panel would eliminate the glare from the ultraviolet light, as well as the visible light. There is a significant improvement of the apparent brightness of paper and textile products when viewed under light sources equipped with full-spectrum, as well as standard fluorescent lamps, as virtually all paper materials and textiles have chemical substances which fluoresce under ultraviolet light.

Claims

1. A multi-layer polarized diffuser with improved ultraviolet light transmission, the improvement comprising:

a thin multi-layered polarizer being disposed between a source of visible and ultraviolet light; and

an area to be illuminated;

wherein the thin multi-layered polarizer is capable of transmitting wavelengths of polarized light of wavelengths between about 290 nanometers and about 800 nanometers;

wherein the multi-layered polarizer comprises a light transmitting support layer and a light polarizing layer;

wherein the light transmitting support layer is composed of material capable of transmitting light of wavelengths between about 290 and about 800 nanometers;

wherein the light transmitting support layer comprises a light diffuser for directed scattering of incident light emanating from a source of visible and ultraviolet light;

wherein the light polarizing layer comprises a thin sheet of light transmissible material, the thin sheet being capable of transmitting and polarizing light of wavelengths between about 290 and about 800 nanometers and

wherein further the support layer comprises a flat light diffuser, the support layer comprising a first substantially flat and smooth surface and a second substantially textured surface and at least one edge, the at least one edge being disposed at the perimeter of the flat light diffuser; and

further wherein

the second substantially textured surface of the flat light diffuser faces toward, a source of visible and ultraviolet light, the textured surface being for refracting incident light emanating from a source of visible and ultraviolet light and further for providing a directed scattering of the incident light, the directed scattering comprising diffusion of the incident light; and

further wherein

the first substantially flat and smooth surface of the flat light diffuser faces toward the area to be illuminated by a source of visible and ultraviolet light.

2. The multi-layer polarized diffuser of claim 1, wherein the thin sheet light polarizing layer is disposed upon and supported by the light transmitting support layer, the thin sheet light polarizing layer being disposed upon and adhered to the first substantially flat and smooth surface of the flat light diffuser.

3. The multi-layer polarized diffuser of claim 2 wherein the light transmitting support layer is composed of molded acrylic polymer.