Headlamp

• US 4,654,758 A
• Filed: 09/06/1985
• Issued: 03/31/1987
• Est. Priority Date: 09/21/1984
• Status: Expired due to Fees

• Current Assignee: Tungsram Reszvenytarsasag
• Original Assignee: Tungsram Rt
• Inventors: Szekacs, Gyorgy
• Primary Examiner(s): Croyle, Carlton R.
• Assistant Examiner(s): Olds, Theodore
• Application Number:
  US06/773,147
• Time in Patent Office: 571 Days
• Field of Search: 362/61, 362/80, 362/297, 362/302, 362/303, 362/305
• US Class Current: 362/516
• CPC Class Codes: F21S 41/162 Incandescent light sources, e.g. filament or halogen lamps
• CPC Class Codes: F21S 41/321 the reflector being a surface of revolution or a planar surface, e.g. truncated
• CPC Class Codes: F21S 41/333 with discontinuity at the junction between adjacent areas
• CPC Class Codes: F21S 41/365 successively reflecting the light
• CPC Class Codes: F21V 7/09 with a combination of different curvatures

Abstract

The invention concerns a headlamp, the envelope of which is constituted internally by at least one concave reflecting surface, preferably by paraboloid-shape and spherical surfaces, and having a light-emitting element in, or near, the focus of the main reflecting surface and mounted on the current conducting support, and the envelope being shut-up by a transparent cover plate. The essence of the invention consists of having a convex mirror located between the light-emitting element and the cover plate, with its reflecting surface facing the light-emitting element and the concave reflecting surfaces. The surface of the convex mirror is preferably of the shape of a hyperboloid of rotation.

Claims

1. A headlamp comprising an envelope constituted internally by a paraboloid of rotation and spherical shaped concave reflecting surfaces, a light emitting element arranged substantially in the focal point of a paraboloid shaped main reflecting surface and mounted on current conducting supports, and a transparent cover plate closing said envelope, wherein a convex mirror is located between said light emitting element and said cover plate and arranged with its reflecting surface facing said light emitting element and said concave reflecting surfaces, the length of the diameter of said convex mirror being equal to or differing by not more than by ±

1/8 of the length of the diameter of the of the smaller aperture of said main reflecting surface from said diagonal straight lines drawn between the junction circle between the main reflecting surface and the cover plate, and the focal point of the main reflecting surface.