Projector lamp reflector

• US 4,035,631 A
• Filed: 12/15/1975
• Issued: 07/12/1977
• Est. Priority Date: 12/15/1975
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Day, Harold R. Jr.
• Primary Examiner(s): O'Connor, Edna M.
• Application Number:
  US05/640,901
• Time in Patent Office: 575 Days
• Field of Search: 240/103 R, 240/41.35 R, 240/41.3, 240/41.25, 240/41.35 C, 240/41.37, 350/125, 352/198, 353/98, 355/67
• US Class Current: 362/297
• CPC Class Codes: F21V 7/09 with a combination of different curvatures

Abstract

The concave reflecting surface of a projector reflector is shaped to provide a first set of reflecting areas which project a first set of light beams arranged to form a first tightly packed mosaic pattern at a plane, and a second set of reflecting areas which project a second set of light beams arranged to form a second tightly packed mosaic pattern superimposed on said first mosaic pattern.

Claims

1. A projector lamp unit comprising a concave reflector and a light source at a focus point of said reflector, and reflector having a first set of concave reflecting areas arranged to project a first set of light beams of given size from said light source to form a first tightly packed mosaic pattern at a plane, and said reflector having a second set of concave reflecting areas arranged to project a second set of light beams of given size from said light source to form a second tightly packed mosaic pattern superimposed on said first mosaic pattern.

2. A lamp unit as claimed in claim 1, in which said given size of the light beams of said first set thereof is different than said given size of the light beams of said second set thereof.

3. A lamp unit as claimed in claim 1, in which said light beams of both sets have circular cross sections.

4. A lamp unit as claimed in claim 3, in which the light beams of one of said sets thereof have diameters approximately twice as large as those of the other set thereof.

5. A lamp unit as claimed in claim 1, in which said sets of reflecting areas are arranged in concentric circles on the concave surface of said reflector.

6. A lamp unit as claimed in claim 5, in which said reflecting areas are circular, the remaining area of said concave surface having a generally ellipsoidal configuration.

7. A lamp unit as claimed in claim 1, in which said light source is an incandescent lamp having a filament and in which said reflecting areas are provided with concave curvatures such that each reflective area will reflect a pattern from said filament which substantially fills the corresponding light beam area at said plane.

8. A lamp unit as claimed in claim 1, in which each of said concave reflecting areas has a generally ellipsoidal concavity configuration.