Movable condenser lens

• US 6,742,918 B2
• Filed: 04/12/2002
• Issued: 06/01/2004
• Est. Priority Date: 04/12/2002
• Status: Expired due to Fees

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: Guide Corporation (Vehicle Lighting Incorporated)
• Inventors: Collins, Tony E.
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): Zeade, Bertrand
• Application Number:
  US10/121,977
• Publication Number:
  US 20030193813A1
• Time in Patent Office: 781 Days
• Field of Search: 362/509, 362/466, 362/531, 362/467, 362/468, 362/465, 362/515, 362/512, 362/513, 362/538, 362/319
• US Class Current: 362/509
• CPC Class Codes: F21S 41/635 by moving refractors, filters or transparent cover plates

Abstract

A system for adjusting the direction of a light beam from a headlamp assembly comprises a condenser lens which is movable along an arcuate path. As a vehicle turns a corner, the system moves the condenser lens along the arcuate path, so as to direct the light beam in the direction that the vehicle is moving. Because the condenser lens follows an arcuate path, the light beam is not distorted, allowing for greater angular displacement of the light beam.

Claims

1. A headlamp for projecting light in a forward direction, said headlamp comprising:

a reflector having a reflector axis, a first focal point located along said reflector axis, and a forward-facing reflector opening;

a light source located proximate to the first focal point;

a condenser lens disposed forward of the reflector opening, the condenser lens being movable in an arcuate path; and

means for moving the condenser lens in an arcuate path.

2. The headlamp of claim 1, wherein the reflector is generally elliptical, the reflector further comprising a second focal point located along the reflector axis, the condenser lens being spaced apart from the second focal point.

3. The headlamp of claim 2, wherein the arcuate path has a focal point, the focal point of the arcuate path proximate the reflector'"'"'s second focal point.

4. The headlamp of claim 3, wherein the condenser lens is movable along an arcuate path of up to about 16 degrees.

5. The headlamp of claim 2, further comprising a means for computing angular displacement operably connected to the means for moving the condenser lens.

6. The headlamp of claim 5, wherein the headlamp is located on a vehicle having at least one front wheel, and wherein the means for computing angular displacement comprises means for sensing the position of the at least one front wheel.

7. The headlamp of claim 6, wherein the means for computing angular displacement further comprises means for sensing the speed of the vehicle.

8. The headlamp of claim 5, wherein the headlamp is located on a vehicle having a steering wheel, and wherein the means for computing angular displacement comprises means for sensing the position of the steering wheel.

9. The headlamp of claim 8, wherein the means for computing angular displacement further comprises means for sensing the speed of the vehicle.

17. The headlamp of claim 1, wherein the condenser lens is movable relative to the reflector.

10. A method of steering the beam of light projected by a headlamp, the method comprising the steps of:

providing a headlamp for projecting light in a forward direction, the headlamp having a reflector with a reflector axis, a first focal point located along said reflector axis, and a forward-facing reflector opening;

providing a light source located proximate to the first focal point;

providing a condenser lens disposed forward of the reflector opening;

the condenser lens being movable in an arcuate path;

providing means for moving the condenser lens in an arcuate path; and

moving the condenser lens along the arcuate path the condenser lens moves along the substantially horizontal plane.

11. The method of claim 10, the step of moving the condenser comprising the steps of:

computing a desired angular displacement; and

moving the condenser lens to the desired angular displacement.

12. The method of claim 11, wherein the step of computing a desired angular displacement comprises the step of determining the position of at least one front wheel of a vehicle.

13. The method of claim 12, wherein the step of computing a desired angular displacement comprises the step of determining the speed of the vehicle.

14. The method of claim 11, wherein the step of computing a desired angular displacement comprises the step of determining the position of a steering wheel.

15. The method of claim 14, wherein the step of computing a desired angular displacement comprises the step of determining the speed of a vehicle.

16. The method of claim 10, wherein the step of providing means for moving the condenser lens in an arcuate path comprises the step of:

providing means for moving the condenser relative to the reflector, and wherein the step of moving the condenser lens along the arcuate path comprises the step of,

moving the condenser lens relative to the reflector.