Arc discharge headlamp system

• US 4,920,459 A
• Filed: 12/21/1988
• Issued: 04/24/1990
• Est. Priority Date: 12/21/1988
• Status: Expired due to Term

• Current Assignee: GTE Products Corporation (Ams-Osram AG)
• Original Assignee: GTE Products Corporation (Ams-Osram AG)
• Inventors: Rothwell, Harold L. Jr., English, George J.
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): Hagarman, Sue
• Application Number:
  US07/287,925
• Time in Patent Office: 489 Days
• Field of Search: 362/61, 362/80, 362/263, 362/265, 362/362
• US Class Current: 362/546
• CPC Class Codes: B60Q 1/007 via a removable cap
• CPC Class Codes: B60Q 1/0094 Arrangement of electronic circuits separated from the light source, e.g. mounting of housings for starter circuits for discharge lamps arrangements being part of the light source holder F21V17/06, F21S43/195
• CPC Class Codes: F21S 41/17 Discharge light sources
• CPC Class Codes: F21S 41/192 Details of lamp holders, terminals or connectors
• CPC Class Codes: F21S 45/33 specially adapted for headlamps
• CPC Class Codes: F21S 45/40 Cooling of lighting devices
• CPC Class Codes: F21S 45/48 with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device

Abstract

A arc discharge headlamp system is disclosed. An arc discharge headlamp system may be formed with a lamp housing including an enclosed reflector, a double ended arc discharge lamp having a two leads at offset ends, enclosed in the reflector. A first lamp support for the front end of the lamp is coupled to the lamp housing, and a first lead connection for the lamp is coupled through a high potential conductor embedded in the lamp housing. The high potential conductor embedded in the lamp housing extends subsurface to a ballast cavity formed in the lamp housing and enclosing a ballast. The ballast is potted in the cavity to protect it. A second lamp lead extends through a second lamp support to the rear of the lamp housing to be connected to the ballast. The lamp capsule, high potential leads, and ballast are all securely enclosed as a single unit with potential leakage between elements, and with the outside prevented.

Claims

1. An arc discharge headlamp system comprising:

a) a lamp housing including an internal surface defining a reflector cavity,

b) a double ended arc discharge lamp having a first lead at a first end and a second lead at a second end, substantially offset from the first lead, enclosed in the reflector cavity,

c) a first lamp support coupled to the first end of the lamp, and coupled to the lamp housing,

d) a first lead connection for the first lead of the lamp coupled through the lamp housing at a first lamp housing position to receive input current,

e) a second lamp support coupled to the second end of the lamp, and coupled to the lamp housing,

f) a second lead connection for the second lead of the lamp, coupled through the lamp housing at a second lamp housing position and offset from the first lamp housing position; and

g) an insulated high potential conductor, connected to the second lead connection, embedded in the lamp housing, and extending in the lamp housing to a third housing position to receive input current.

2. The arc discharge lamp system of claim 1 wherein the reflector cavity has an optical axis extending perpendicular to the lamp housing surface through the reflector cavity to a zone to be illuminated.

3. The arc discharge lamp system of claim 2 wherein the arc discharge lamp is positioned so a generated arc is substantially parallel with the optical axis.

4. The arc discharge lamp system of claim 2, wherein the second support rigidly extends from the lamp housing with a component transverse to the optical axis.

5. The arc discharge lamp system of claim 1, wherein the lamp housing is a plastic material.

6. The arc discharge lamp system of claim 5, wherein the plastic housing material is electrically nonconductive.

7. The arc discharge lamp system of claim 5, wherein the plastic housing material is heat resistant.

8. The arc discharge lamp system of claim 1, wherein the lamp housing further includes a ballast cavity with an included ballast to assist in starting and operating the lamp, the ballast being connected to the first lead, and connected through the high potential conductor to the second lead.

9. The arc discharge lamp system of claim 8, wherein the ballast cavity with the included ballast is otherwise filled with an electrically insulating potting material.

10. The arc discharge lamp system of claim 1, wherein the second support includes a conductive element to serve as the second lead connection.

11. The arc discharge lamp system of claim 10, wherein the second lamp support, and second lead connection are a single rigid metal piece.

12. The arc discharge lamp system of claim 11, wherein the rigid metal piece forming the second lamp support, and second lead connection has an insulating layer.

13. The arc discharge lamp system of claim 12, wherein the rigid metal piece and insulating layer are a rigid metal rod with a glass coating.

14. The arc discharge lamp system of claim 1, further including a covering lens closing the reflector cavity to enclose the discharge lamp capsule.

15. The arc discharge lamp system of claim 1, further including means for affecting the gas discharge tube, the means being positioned in the reflector cavity, adjacent the lamp capsule, and electrically coupled to circuitry enclosed in the lamp housing.

16. An arc discharge headlamp system comprising:

a) a lamp housing including an internal surface defining a first and second reflector cavity,

b) a first and second double ended arc discharge lamp having respectively a first lead at a first end and a second lead at a second end, substantially offset from the first lead, enclosed respectively in the first and second reflector cavities,

c) first lamp supports coupled respectively to the first end of the first and second lamps, and coupled to the lamp housing,

d) first lead connections respectively for the first leads of the first and second lamps coupled respectively through the lamp housing at a first lamp housing positions to receive input current,

e) second lamp supports coupled respectively to the second ends of the first and second lamps, and coupled to the lamp housing,

f) second lead connections respectively for the second leads of the first and second lamps, coupled respectively through the lamp housing at second lamp housing positions and offset from the first lamp housing positions,

g) insulated high potential conductors, connected respectively to the second lead connections, embedded in the lamp housing, and extending in the lamp housing respectively to third housing positions to receive input current; and

h) a common ballast cavity with an included ballast to assist in starting and operating the first and second lamps, the ballast connected respectively to the first leads, and connected respectively through the high potential conductors to the second leads.

17. An arc discharge head lamp system comprising:

a) a lamp housing formed from a electrically nonconductive, heat resistant plastic material including a reflective surface defining an enclosed reflector cavity, the reflective surface having an optical axis extending perpendicular to the reflective surface through the reflector cavity to a zone to be illuminated,

b) a double ended arc discharge lamp having a first lead at a first end and a second lead at a second end substantially offset from the first lead, enclosed in the reflector cavity, the arc discharge lamp is positioned so a generated arc is substantially parallel with the optical axis,

c) a first lamp support for the first end of the lamp coupled to the lamp housing,

d) a first lead for the first end of the lamp coupled through the reflective surface at a first lamp housing position,

e) a second lamp support for the second end of the lamp, coupled to the lamp housing, rigidly extending from the lamp housing with a component transverse to the optical axis and joining with the front lead of discharge lamp, and a second lead for the second end of the lamp, coupled through the reflective surface at a second lamp housing position and offset from the first lamp housing position, in the form of a rigid metal rod with a glass coating,

f) a surface connector, connected to the second electrode connection, embedded in the lamp housing, and extending in the lamp housing to a third housing position to receive input current,

g) a ballast embedded in the lamp housing to assist in starting and operating the lamp, and

h) a covering lens closing the housing cavity including the reflector cavity, and discharge lamp.

18. An arc discharge head lamp system comprising:

a) a lamp housing formed from an electrically nonconductive, heat resistant plastic material including a reflective surface defining an enclosed reflector cavity,

b) means for generating light positioned and supported in the reflector cavity,

c) a first lead and a second lead for powering the light generating means coupled through the lamp housing,

d) control means for operating the light generating means embedded in the lamp housing, receiving the leads for the light generating means through the lamp housing, and receiving low voltage power from an exterior source, and

e) a covering lens for closing the reflector cavity including light generating means.

19. The arc discharge lamp system of claim 18, wherein the control means further receives a control signal.