Lamp with tubular bulb and reflector

• US 3,900,727 A
• Filed: 09/17/1974
• Issued: 08/19/1975
• Est. Priority Date: 05/08/1972
• Status: Expired due to Term

• Current Assignee: Hugo Hutz
• Original Assignee: Hugo Hutz
• Inventors: Hutz, Hugo
• Primary Examiner(s): Sheer, Richard M.
• Application Number:
  US05/506,697
• Time in Patent Office: 336 Days
• Field of Search: 240/41,41.35R,41.35F,1.3,3,13R,41.35C,41.36,41.37,41.38,11.4R
• US Class Current: 362/263
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources

Abstract

Disclosed is an electric lamp comprising a reflector and a tubular-shaped bulb having an illuminating arc of a length which is short in comparison to the total length of the bulb. The reflector encloses essentially only the arc portion of the bulb, thereby enhancing the performance and design of the lamp. A novel rear reflector design is also provided for maximizing the efficiency of the lamp.

Claims

1. An electric lamp which produces a rotationally symmetric light beam with a very high illuminating efficiency, comprising a reflector having two diametrically opposed apertures, said reflector being rotationally symmetric about an axis parallel to the light beam of the lamp and a tubular-shaped discharge bulb extending through said apertures and having an illuminating arc of a length which is short in comparison to the total bulb length, said opposed apertures being of a size greater than the diameter of said bulb, said apertures terminating immediately forward of said bulb in the direction of the light beam and being located so that said reflector encloses essentially only said short illuminating arc poRtion of the bulb, the residual major portion of said bulb extending on the outside of said reflector.

2. An electric lamp according to claim 1, wherein said reflector has a rear section and a front section, said rear section being adapted to enclose said bulb and being of greater curvature than the front section.

3. An electric lamp according to claim 2, wherein there is a constriction between the rear section and the front section.

4. An electric lamp according to claim 1, wherein each of said apertures extends from immediately forward of said bulb rearwardly along the entire length of the reflector to a point where said apertures meet one another, thereby forming a single slot the width and depth of which are greater than the diameter of the bulb, whereby the reflector may be removed from said lamp and said bulb replaced along the direction of said reflector axis.

5. An electric lamp according to claim 2, wherein the rear section of the reflector is spherical in shape.

6. An electric lamp according to claim 2, wherein the front section of the reflector is approximately paraboloid-shaped.

7. An electric lamp according to claim 6, wherein the front section of the reflector further comprises a rim section which is shaped as part of an inversely applied paraboloid.

8. The electric lamp as defined by claim 1, wherein the length of the illuminating arc portion of said bulb in relation to the total length of the bulb is in a ratio of about 48:

205.

9. The electric lamp as defined by claim 1, wherein the length of the illuminating arc portion of said bulb in relation to the total length of the bulb is in a ratio of about 25:

162.

10. The electric lamp as defined by claim 1, wherein the length of the illuminating arc portion of said bulb is less than about 25% of the total length of the bulb.

11. An electric lamp according to claim 1, wherein said reflector comprises separable front and back sections, said back section having at its front edge the said two diametrically opposed apertures, whereby upon separation of said front section from said back section, the bulb may be replaced along the direction of said reflector axis.

12. An electric lamp according to claim 11, wherein the reflector is substantially axially symmetrical, and in the rear in the region of its central axis the reflector is indented toward the front in the direction of said central axis.

13. An electric lamp according to claim 12, wherein the indented portion of the reflector is formed into a tip in front.

14. An electric lamp according to claim 13, wherein the tip of the indented portion is cut off, thereby forming an aperture.

15. An electric lamp according to claim 11, further comprising outwardly projecting, circumferential ledges of complementary shape at the front edge of the rear section of the reflector and at the rear edge of the front section of the reflector.

16. An electric lamp according to claim 15, further comprising a circumferential skirt projecting downwardly from the outwardly projecting ledge of the rear section of the reflector.