High-pressure discharge lamp with ignition circuit including halogen incandescent lamp

• US 6,661,177 B2
• Filed: 08/07/2001
• Issued: 12/09/2003
• Est. Priority Date: 08/08/2000
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Hendrix, Johan Leopold Victorina, Luijks, Gerardus Marinus Josephus Franciscus
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): VO, TUYET THI
• Application Number:
  US09/923,606
• Publication Number:
  US 20020047529A1
• Time in Patent Office: 854 Days
• Field of Search: 315/60, 315/58, 315/59, 315/71, 315/50, 315/52, 315/53, 313/569, 313/578, 313/25, 313/315, 313/316, 313/579
• US Class Current: 315/60
• CPC Class Codes: H01J 61/34 Double-wall vessels or containers
• CPC Class Codes: H01J 61/54 Igniting arrangements, e.g. promoting ionisation for starting
• CPC Class Codes: H01J 61/541 using a bimetal switch
• CPC Class Codes: H05B 41/04 Starting switches
• CPC Class Codes: H05B 41/08 heated by glow discharge

Abstract

The invention relates to a high-pressure discharge lamp comprising a discharge vessel which is enclosed, with clearance, by an outer bulb. The outer bulb is closed at one end by a lamp cap. The lamp is provided with an ignition circuit including at least a series arrangement of a glow starter and an ohmic impedance. According to the invention, the ohmic impedance is formed by a halogen incandescent lamp.

Claims

1. A high-pressure discharge lamp comprising a discharge vessel which is enclosed, with clearance, by an outer bulb which is provided, at an end, with a lamp cap, which lamp also comprises an ignition circuit including a series arrangement of a glow starter switch and an ohmic impedance, characterized in that said ohmic impedance is formed by a halogen incandescent lamp.

2. The high-pressure discharge lamp as claimed in claim 1, characterized in that the lamp is a metal halide lamp.

3. The high-pressure discharge lamp as claimed in claim 1, characterized in that the lamp comprises a discharge vessel with a ceramic wall.

4. The high-pressure discharge lamp as claimed in claim 1, characterized in that the series arrangement also comprises a bimetal switch, which is closed in a cold state.