Light reflectant surface for photoinduction chambers

• US 5,689,364 A
• Filed: 12/06/1995
• Issued: 11/18/1997
• Est. Priority Date: 01/06/1995
• Status: Expired due to Term

• Current Assignee: W. L. Gore & Associates (W.L. Gore & Associates)
• Original Assignee: WL Gore and Associates Incorporated (W.L. Gore and Associates)
• Inventors: Minor, Raymond B., Henn, Robert Lyon, McGregor, Gordon L., Hannon, Gregory E.
• Primary Examiner(s): Henry, Jon W.
• Application Number:
  US08/569,411
• Time in Patent Office: 713 Days
• Field of Search: 359/350, 359/361, 359/599, 315/39, 315/248, 315/344
• US Class Current: 359/350
• CPC Class Codes: B29K 2027/18 PTFE, i.e. polytetrafluorethene , e.g. ePTFE, i.e. expanded polytetrafluorethene
• CPC Class Codes: C08J 2327/18 Homopolymers or copolymers of tetrafluoroethylene
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08L 27/18 Homopolymers or copolymers or tetrafluoroethene
• CPC Class Codes: F21S 41/37 characterised by their material, surface treatment or coatings
• CPC Class Codes: F21V 7/24 characterised by the material
• CPC Class Codes: F21V 7/28 characterised by coatings
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence
• CPC Class Codes: G02B 5/0247 by means of voids or pores
• CPC Class Codes: G02B 5/0284 used in reflection
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605

Abstract

Improved material and method for reflecting light in a photoinduction chamber is provided. The material comprises one or more layers of expanded polytetrafluoroethylene (ePTFE) membrane. Employing an ePTFE membrane as a reflective surfaces is demonstrated as providing excellent diffuse reflective properties, especially in the ultraviolet and visible ranges of light. Additionally, the material of the present invention has many other properties that make it particularly desirable for use in various photoinduction chamber applications, including inertness, flexibility, ease in shaping and installation, etc.

Claims

1. A method of providing improved reflectivity of light in a photoinduction chamber incorporating a UV lamp, which comprises:

providing a reflectant material comprising an expanded polytetrafluoroethylene having polymeric nodes interconnected by fibrils defining microporous voids therein; and

mounting the (reflectant material such that light from the UV lamp can strike and reflect from the reflectant material.

2. The method of claim 1 that further comprises that the reflective material provides reflectivity.

3. The method of claim 1 that further comprises providing light in the photoinduction chamber including wavelengths in the visible light spectrum.

4. The method of claim 1 that further comprises the reflectant material reflecting greater than 90% of the UV light striking its surface.

5. The method of claim 1 that further comprises the reflectant material reflecting greater than 95% of the UV light striking its surface.

6. The method of claim 1 that further comprises the reflectant material reflecting greater than 99% of the UV light striking its surface.

7. A method of providing improved reflectivity of light in a photoinduction chamber which incorporates a microwave activated lamp, which comprises:

providing a reflectant material comprising an expanded polytetrafluoroethylene having polymeric nodes interconnected by fibrils defining microporous voids therein; and

mounting the reflectant material such that microwave energy transmits through the reflective material, energizes the lamp, and that light from the lamp can strike and reflect from the reflectant material.

8. The method of claim 7 that further comprises the reflectant material reflecting greater than 99% of UV light striking its surface.

9. A photoinduction chamber that comprises:

a light source;

a reflective surface oriented to direct light from the light source;

a layer of reflectant material mounted on at least a portion of the reflective surface, the reflectant material comprising an expanded polytetrafluoroethylene having polymeric nodes interconnected by fibrils;

wherein the light source emits ultraviolet light, and greater than 95% of the ultraviolet light striking the reflectant material is reflected therefrom.

10. A photoinduction chamber that comprises:

a light source;

a reflective surface oriented to direct light from the light source;

a layer of reflectant material mounted on at least a portion of the reflective surface, the reflectant material comprising an expanded polytetrafluoroethylene having polymeric nodes interconnected by fibrils;

wherein the reflectant material reflects greater than 99% of the light striking its surface.