Headlight for motor vehicles

• US 5,434,763 A
• Filed: 02/07/1994
• Issued: 07/18/1995
• Est. Priority Date: 03/30/1993
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Froelich, Thomas, Kienzler, Thomas, Drews, Ulrich, Hege, Guenter
• Primary Examiner(s): Husar, Stephen F.
• Application Number:
  US08/192,646
• Time in Patent Office: 526 Days
• Field of Search: 362/61, 362/80, 362/263, 362/265, 362/310, 362/226
• US Class Current: 362/265
• 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: F21V 25/00 Safety devices structurally associated with lighting devices gas- tight or water-tight arrangements F21V31/00; in general F16P; protective circuit arrangements per se H02H7/00
• CPC Class Codes: H05B 41/292 Arrangements for protecting lamps or circuits against abnormal operating conditions

Abstract

A headlight for vehicles has a light source formed as a gas discharge lamp, a ballast unit connected with the gas discharge lamp and producing high voltage, and a unit for preventing dispersion of electromagnetic radiation caused by the gas discharge lamp. The unit includes an electrical filtering circuit arranged near the gas discharge lamp and having a plurality of components, and a housing surrounds at least a part of the components of the electrical filtering circuit.

Claims

1. A headlight for vehicles, comprising a light source formed as a gas discharge lamp;

a ballast unit connected with said gas discharge lamp and producing high voltage;

means for preventing dispersion of electromagnetic radiation caused by said gas discharge lamp, said means including an electrical filtering circuit arranged near said gas discharge lamp and having a plurality of components; and

a housing surrounding at least a part of said components of said electrical filtering circuit.

2. A headlight as defined in claim 1;

and further comprising electrical conductors which connect said gas discharge lamp with said ballast unit, said components of said filtering circuit including inductive components each connected in series with a respective one of said conductors, and at least one capacitive component connected in parallel between said conductors.

3. A headlight as defined in claim 1;

and further comprising a synthetic plastic mass which fills said housing in which said components are cast.

4. A headlight as defined in claim 1;

and further comprising conductors which connect said gas discharge lamp with said ballast unit, said gas discharge lamp having a base, said housing being formed as a plug part which is connectable with said base of said gas discharge lamp and produces a connection of said gas discharge lamp with said conductors.