Lighting panel with opposed 45.degree. corrugations

• US 4,542,449 A
• Filed: 08/29/1983
• Issued: 09/17/1985
• Est. Priority Date: 08/29/1983
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: Canadian Patents and Development Limited
• Inventors: Whitehead, Lorne A.
• Primary Examiner(s): Nelson, Peter A.
• Application Number:
  US06/527,495
• Time in Patent Office: 750 Days
• Field of Search: 362/308, 362/330, 362/331, 362/332, 362/339, 362/311
• US Class Current: 362/330
• CPC Class Codes: F21V 5/02 of prismatic shape F21V5/04 takes precedence

Abstract

The lighting panel has a first face for receiving light from a source and a second face. The panel includes a first and a second sheet of transparent dielectric material. Each sheet has a smooth surface on one side and is corrugated on the other side. The surfaces forming the corrugations intersect at 90° the smooth surface on the first side is at 45° to the surfaces of the corrugations on the other side of each sheet. The smooth surface of the first sheet forms the first face of the panel, the corrugated surface of the first sheet is adjacent to the smooth surface of the second sheet, with the direction of the corrugations on the second sheet set at a predetermined angle α to the direction of the corrugations on the first sheet. Light thus enters the smooth surface of the first sheet and emerges from the corrugated surface of the second sheet. The sheets may be substantially planar. At least one of the sheets may also include light release mechanisms. The angle α may be set at substantially 90°, or may be varied to produce a desired light directionality.

Claims

1. A lighting panel having a first face to be positioned to receive light from a source and a second face, comprising:

a first and a second sheet of transparent dielectric material, each sheet having a first smooth surface and a second corrugated surface wherein the surfaces of the corrugations interact at 90° and

the surfaces of the corrugations are at 45°

to the first smooth surface, the smooth surface of the first sheet forming the first face of the panel and the corrugated surface of the first sheet being of substantially equal size adjacent the smooth surface of the second sheet with the direction of the corrugations on the second sheet being at a predetermined angle α

greater than 0°

but less than 180°

to the direction of the corrugations on the first sheet, whereby distributed light enters the smooth surface of the first sheet and emerges from the corrugated surface of the second sheet.

2. A panel as claimed in claim 1 wherein the sheets are substantially planar.

3. A panel as claimed in claim 1 wherein at least one of the sheets includes light release mechanisms.

4. A panel as claimed in claim 1 wherein the angel α

is substantially 90°

.

5. A panel as claimed in claim 1 wherein the second sheet adjusts relative to the first sheet to vary the angle α

.