Diffuse high reflectance film

Inactive Publication Date: 2005-06-23
SPHEREOPTICS HOFFMAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004] The present disclosure provides a diffuse reflective film including a bottom layer of reflective specular material and a top layer of polytetrafluoroethylene (PTFE) diffuser material. The resulting film is preferably flexible and can diffusely reflect radiation substantially uniformly across the UV-VIS-NIR part of the electromagnetic spectrum, e.g., UV-VIS-NIR light having a wavelengths within the 250 to 2500 nanometer (nm) range, and more efficiently than most other known reflectors of similar thickness, e.g., greater than 96% reflective across the UV-VIS-NIR (250-2400 nanometers) part of the spectrum. The diffuse reflective film has a reduced thickness of less than 1500 micrometers, while maintaining a high absolute reflectance value. This reduced thickness allows for creation of various products having a narrow profile, such as liquid crystal display (LCD) illumination systems.
[0008] The bottom layer of reflective specular material can comprise other thin, highly reflective and specular metal films or substrates, and the Zenith™ diffuse material applied to other films and substrates also has enhanced reflectivity and will yield similar results.

Problems solved by technology

Typical diffuse reflectors, used for example as white standards for various light measuring test instruments, are made of white inorganic compounds (such as barium sulfate or magnesium oxide) in the form of pressed cake or ceramic tile, all of which are expensive, stiff, and brittle.

Method used

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Examples

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Embodiment Construction

[0017] Referring to FIG. 1, the present disclosure provides a diffuse reflective film 10 including a bottom or back layer of reflective specular material 12 and a top or front layer 14 of polytetrafluoroethylene (PTFE) diffuser material. The resulting film 10 is preferably flexible such that it can be easily conformed to many different useful configurations, and can diffusely uniformly reflect radiation in the ultraviolet-visible-near infrared (UV-VIS-NIR) range of the electromagnetic spectrum, i.e. between 250 and 2500 nanometers (nm), efficiently. By “efficiently” it is meant, for example, greater than 96% reflective across this portion of the spectrum, than most other known reflectors of similar thickness. The diffuse reflective film 10 has a reduced thickness of less than 1000 micrometers, while maintaining a high absolute reflectance value (it should be noted that the drawing in FIG. 1 is not to scale or proportion and is greatly enlarged to more easily illustrate the different...

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Abstract

A diffuse reflective film including a bottom layer of reflective specular material and a top layer of polytetrafluoroethylene (PTFE) diffuser material for diffusely reflecting at least 96% of light in the portion of the electromagnetic spectrum between about 400 nanometers and about 2500 nanometers, and wherein the diffuse reflective film has a thickness of less than 1500 micrometers.

Description

TECHNICAL FIELD OF THE DISCLOSURE [0001] The present disclosure relates to an improved high reflectance material and, in particular, to the creation of a composite material combining polytetrafluoroethylene (PTFE) diffuser material with thermally induced phase separation (TPIS) thin films or thin, highly reflective and specular metal films or substrates resulting in a highly lambertian, highly reflective diffuse material having significant optical benefits over currently available products. BACKGROUND OF THE DISCLOSURE [0002] Diffuse reflection provides reflective light luminance at many angles, in contrast to specular or mirror reflection in which light is reflected back only at an angle equal to that of the incident radiation. Typical diffuse reflectors, used for example as white standards for various light measuring test instruments, are made of white inorganic compounds (such as barium sulfate or magnesium oxide) in the form of pressed cake or ceramic tile, all of which are expe...

Claims

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Application Information

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IPC IPC(8): B32B27/08B65D1/00G02B5/02G02B5/08
CPCB32B27/08G02B5/021Y10T428/1352G02B5/08G02B5/0284B32B2457/202B32B7/12B32B2307/418B32B2307/416B32B27/322
InventorDURELL, CHRISTOPHER N.BOHME, WOLFGANG
OwnerSPHEREOPTICS HOFFMAN