Forward illumination lighting system for vehicles

• US 4,868,718 A
• Filed: 03/13/1989
• Issued: 09/19/1989
• Est. Priority Date: 03/13/1989
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Davenport, John M., Hansler, Richard L., Finch, William W.
• Primary Examiner(s): Dority, Carroll B.
• Application Number:
  US07/322,607
• Time in Patent Office: 190 Days
• Field of Search: 362/32, 350/96.18, 350/96.1
• US Class Current: 362/511
• CPC Class Codes: F21S 41/24 Light guides
• CPC Class Codes: F21S 41/635 by moving refractors, filters or transparent cover plates
• CPC Class Codes: G02B 6/0008 the light being emitted at the end of the fibre

Abstract

A lighting subsystem is disclosed that uses optical devices to alter, the actual or apparent optical position of the ends of optical fibers coupled to a high intensity light source so as to provide all of the forward illumination needs for a vehicle. In one embodiment, optical wedges are interposed between a rectangular array of optical fibers and an array of lens elements mountable on the front of a vehicle from which the forward illumination is transmitted therefrom. The imposition of the optical devices alters the actual or apparent optical position of the fibers relative to the lenses and thereby changes the forward illumination from its low to its high beam pattern, to a fog beam illumination or to a cornering illumination pattern. In another embodiment, flat shaped optical members are rotated to provide the various forward illumination needs of the vehicle.

Claims

1. A lighting subsystem for a vehicle comprising:

(a) a high intensity light source capable of being selectively energized;

(b) a plurality of optical carrying devices each having one end predeterminedly coupled to said light source with the other end of each of the optical fibers emitting light upon activation of said high intensity light source;

(c) a plurality of lens elements positioned relative to the ends of the respective optical carrying devices and being mountable in the frontal area of said vehicle;

(d) means including a moveable light transmitting device capable of being imposed between said ends of the respective optical carrying devices and lens elements, said imposition altering the apparent optical position of said ends of the optical carrying devices relative to said lens elements; and

(e) means for moving said device to a selected position to alter the pattern of light transmitted to said lens.

2. A lighting system according to claim 1 wherein said moveable device is of a wedge shape having a predetermined wedge angle, a predetermined thickness and a predetermined index of refraction, the amount of altering of said apparent optical position of said ends of the optical carrying devices increasing as a function of said wedge angle, said thickness, and said index of refraction.

3. A lighting system according to claim 1 wherein said moveable device is of a flat shape having a predetermined thickness and a predetermined index of refraction, the amount of altering of said optical position increasing as a function of said thickness and said index of refraction.

4. A lighting system according to claim 1 wherein said moveable device is of a flat shape having a predetermined thickness and a predetermined index of refraction, said moveable device being imposed between said optical carrying devices and said lens elements and rotated to various angles relative to the optical axis of said respective lens element, the amount of altering of said apparent optical position increasing as a function of said angle of rotation, said thickness, and said index of refraction.

5. A lighting system according to claim 1 wherein said altering of said apparent optical position of said ends of said optical carrying devices is selected so that the illumination transmitted from said lens elements upon energization of said high intensity discharge lamp is changed from a first pattern to a second pattern.