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Discharge lamp for vehicle

A technology for discharge lamps and vehicles, applied to discharge lamps, gas discharge lamps, high-pressure discharge lamps, etc., can solve problems such as deterioration of light distribution characteristics, achieve the effects of ensuring light distribution performance, good light distribution performance, and suppressing temperature reduction

Inactive Publication Date: 2011-09-21
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Therefore, since the overall length of the arc tube is lengthened, the possibility that the light emitted from the light emitting part is blocked by the arc tube increases, and in the structure of the vehicle headlamp, the light distribution characteristic may be deteriorated.

Method used

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  • Discharge lamp for vehicle
  • Discharge lamp for vehicle

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Experimental program
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Embodiment Construction

[0035] Hereinafter, preferred embodiments for carrying out the discharge lamp for vehicles of the present invention will be described with reference to the drawings. The vehicle discharge lamp has a vehicle headlamp.

[0036] The vehicle headlamp 1 is mounted on both left and right ends of the front end of the vehicle body.

[0037] Such as figure 1 As shown, the vehicle headlamp 1 includes: a lamp housing 2 and a cover 3, the lamp housing 2 has a recess opening at the front, the cover 3 blocks the opening surface of the lamp housing 2, and the lamp housing 2 The body 2 and the cover 3 constitute the outer frame 4 of the lamp. The inner space of the lamp frame 4 is formed as a lamp chamber 5 .

[0038] A rear end portion of the lamp housing 2 is formed with an insertion hole 2 a penetrating front and rear, and the insertion hole 2 a is closed by a rear cover 6 . The lower end portion of the lamp housing 2 is formed with an arrangement hole 2b penetrating vertically.

[00...

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Abstract

The present invention provide a discharge lamp for a vehicle in which a light distribution performance and a luminous efficiency can be enhanced. The discharge lamp for a vehicle in which a light emission is carried out by a DC lighting method, comprises: an external tube attached to a socket; a light emitting tube disposed in the external tube and formed of ceramic, the light emitting tube including a light emitting portion and a pair of narrow tube portions linked to the light emitting portion at opposite sides with the light emitting portion interposed therebetween; a cathode side electrode and an anode side electrode which are disposed in the light emitting tube; and two lead wires connected to the cathode side electrode and the anode side electrode respectively and having at least a part disposed in the external tube respectively, wherein a length of the narrow tube portion on the cathode side being set to be smaller than that of the narrow tube portion on the anode side, and the cathode side electrode being disposed on an opposite side to the socket with the anode side electrode interposed therebetween.

Description

technical field [0001] The present invention relates to a discharge lamp for vehicles. Specifically, the length of the thin tube portion on the cathode side is shorter than the length of the thin tube portion on the anode side, and the cathode side electrode is arranged on the opposite side of the socket through the anode side electrode, so as to improve light distribution performance and light emission. efficiency. Background technique [0002] Vehicle headlamps are different from general lighting in that precise light distribution control is required, so a uniform rod-shaped light emission shape with a high light-to-dark ratio is required. Since filaments of incandescent lamps and halogen lamps have such characteristics, they have been used as light sources for vehicle headlamps for a long time. [0003] On the other hand, in the vehicle headlamp of the discharge lamp used as the light source, there are following advantages: the discharge lamp is compared with the incand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/06H01J61/34H01J61/30H01J61/35H01J61/36H01J61/88
CPCH01J61/34H01J61/30H01J61/35H01J61/827
Inventor 志藤雅也津田俊明
Owner KOITO MFG CO LTD
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