Stroboscopic lamp optical system

• US 5,023,764 A
• Filed: 11/03/1989
• Issued: 06/11/1991
• Est. Priority Date: 11/03/1989
• Status: Expired due to Term

• Current Assignee: Ferret Instruments Incorporated
• Original Assignee: Ferret Instruments Incorporated
• Inventors: Gauthier, Thomas F., McKinnon, Donald C.
• Primary Examiner(s): Husar, Stephen F.
• Assistant Examiner(s): Hagarman, Sue
• Application Number:
  US07/431,535
• Time in Patent Office: 585 Days
• Field of Search: 362/157, 362/208, 362/341, 362/346, 362/347, 362/349, 362/16, 362/335, 362/208, 362/297, 362/299, 362/300, 362/301, 362/327, 362/328
• US Class Current: 362/299
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources

Abstract

The invention pertains to a stroboscopic timing light for use with internal combustion engines. The reflector assembly is designed to increase the proportion of light from a flash tube that becomes part of a focused light beam. The reflector assembly comprises a pair of angled reflectors or series of reflectors forming a frusto-pyramid-like structure which reflects an array of images of a flash lamp. These images reflect the substantial portion of the light from the flash lamp while providing a cost effective and relatively inexpensive reflector assembly.

Claims

1. An improved stroboscopic timing light assembly, comprising:

a flash lamp;

a pair of planar side reflectors each terminating in a free edge, said pair of forward facing side reflectors being substantially disposed along respective planes which converge at a point to form an acute angle with respect to each other, said flash lamp being disposed between said reflectors proximate said point and spaced therefrom; and

a convex projecting lens disposed proximate said free edges, the reflectors, the lamp and the lens being disposed such that a beam of light emitted from said lamp is reflected by said reflectors to create a plurality of images, which are condensed and projected by said lens to create an enhanced image projected from the assembly.

2. The apparatus of claim 1, wherein said improved stroboscopic timing light assembly further comprises:

a back reflector element connecting said pair of side reflectors.

3. The apparatus of claim 1, wherein:

said back reflector element comprises a planar rear reflector disposed substantially perpendicular to said optical axis.

4. The apparatus of claim 2, wherein:

said back of said flash lamp is cylindrical in configuration; and

said back reflector element comprises a semicircular rear reflector having substantially the same radius of curvature as said flash lamp and disposed to contact a portion of the surface of said flash lamp.

5. The apparatus of claim 2, wherein said back reflector element is integral with said pair of forward facing side reflectors.

6. The apparatus of claim 1, further comprising:

a pair of secondary reflectors disposed with respect to said pair of forward facing side reflectors to form a frusto-pyramid-like reflector array.

7. The apparatus of claim 6, wherein said pair of side reflectors and said pair of secondary reflectors form a frusto-pyramidal-like reflector array having a substantially rectangular cross section.

8. The apparatus of claim 7, wherein said reflector array is formed out of a single sheet of reflective material.

9. The apparatus of claim 1, wherein said pair of side reflectors are made from metallic reflective material.

10. The apparatus of claim 1, wherein said flash lamp has a light diffusing surface.

11. The apparatus of claim 1, wherein each of said pair of side reflectors further comprise means for mounting said flash lamp.

12. The apparatus of claim 1, wherein each of said side reflectors is disposed one half of the diameter of said flash lamp from said flash lamp.

13. The apparatus of claim 1, wherein said pair of forward facing side reflectors are disposed so as to create an array of contiguous reflected images of the flash lamp.

14. The assembly of claim 1 further comprising a housing for containing the reflectors, the lamp and the lens.

15. An improved stroboscopic timing light assembly comprising:

a cylindrical flash lamp having a diameter D;

a convex projecting lens positioned relative the front side of said flash lamp along an optical axis connecting the centers of said flash lamp and said convex projecting lens; and

a pair of planar side reflectors each terminating in a free edge, said pair of forward facing side reflectors being substantially disposed along respective planes which converge at a point to form an acute angle A with respect to each other, said flash lamp being disposed between said reflectors proximate said point, said reflectors acting to reflect a circular image array of said flash lamp, said array having a radius R determined by the relationship;

##EQU2## and a convex projecting lens disposed proximate said free edges such that the reflected image array is projected by said lens to create an enhanced image projected from the assembly.

16. The apparatus of claim 15, wherein each of said pair of side reflectors further comprise means for mounting said flash lamp.

17. The apparatus of claim 15, wherein each of said side reflectors is disposed one half of the diameter of said flash lamp from said flash lamp.

18. The apparatus of claim 15, wherein said pair of forward facing side reflectors are disposed so as to create an array of contiguous reflected images of the flash lamp.

19. The apparatus of claim 15 wherein the pair of side reflectors each comprise a second, non-planar portion which flares out of its respective plane.

20. An improved stroboscopic timing light assembly comprising:

a flash lamp;

a convex projecting lens arranged along a optical axis for projecting a beam of light emitted form said flash lamp;

a single sheet of reflective material bent along fold lines formed thereon to form;

a pair of primary reflectors substantially conforming to a first pair of opposed sides of a frusto-pyramid-like structure and located on opposite sides of said optical axis, said pair of primary reflectors including short ends which are positioned proximate said flash lamp and long ends which are positioned proximate said convex projecting lens,

a back reflector element positioned behind said flash lamp, and

a pair of secondary reflectors substantially conforming to a second pair of opposed sides of a frusto-pyramid-like structure substantially contiguous with said pair of primary reflectors to form a frusto-conical reflector which surrounds said flash lamp.

21. The apparatus of claim 20, wherein:

said back reflector element is formed integral with said pair of primary reflectors.

22. The apparatus of claim 20, wherein:

said flash lamp is cylindrical in configuration; and

said back reflector element comprises a semicircular rear reflector having substantially the same radius of curvature as said flash lamp and disposed to contact a portion of the surface of said flash lamp.

23. The apparatus of claim 20, wherein said flash lamp has a light diffusing surface.

24. The apparatus of claim 20, wherein said flash lamp is cylindrical in shape.

25. The apparatus of claim 20, wherein said single sheet of reflective material is metallic.

26. An improved stroboscopic timing light assembly comprising:

a cylindrical flash lamp;

a reflector formed from a single piece of metallic reflective material to form a frusto-pyramidal-like reflector element disposed tangent to said flash lamp, and a semi-circular back reflector element contacting said flash lamp, such that said reflector forms an array of reflected images of said flash lamp; and

a convex projecting lens disposed adjacent said frusto-conical reflector element such that said lens gathers the light from said flash lamp and said array of reflected images of said flash lamp to form a beam of light.