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Patent EP0445757A2 successfully refreshed from Google Patents.
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EP0445757A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Electric discharge lamp unit

Assignee: TDK Corp
•
Filing: 1991-03-05
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Granted: —
•
Expires: 2011-03-05
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Abstract

Abstract A high-intensity electric discharge lamp is turned on in an ideal starting characteristics regardless of the internal condition thereof during the night or in a tunnel, in which no ambient light falls on the high-intensity electric discharge lamp. Upon the reception of the ambient light, the high-intensity electric discharge lamp is turned off automatically. In a modification, the high-intensity electric discharge lamp unit is provided with first and second photoelectric conversion elements, the luminous flux of the light emitted by the high-intensity electric discharge lamp is controlled on the basis of the output signal of the first photoelectric conversion element corresponding to the luminous flux of the light emitted by the high-intensity electric discharge lamp, and the high-intensity electric discharge lamp is turned off when the second photoelectric conversion element receives the ambient light.

Inventors

  • 👤 Kiyoshi C/O Tdk Corporation Matsui
  • 👤 Takayuki C/O Tdk Corporation Kanno

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 22:48
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392; H05B41/3921; H05B41/3922; H05B47/00; H05B47/10; H05B47/105; H05B47/11; Y; Y02; Y02B; Y02B20/00; Y02B20/40

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 77 words
A high-intensity electric discharge lamp unit comprising: a high-intensity electric discharge lamp which emits light by arc discharge through a gas contained in a tube; a photoelectric converter which receives the light emitted by the high-intensity electric discharge lamp and provides an output signal corresponding to the luminous flux of the light; and a controller which controls the lighting condition of the high-intensity electric discharge lamp on the basis of the output signal of the photoelectric converter.
Claim 2
Dependent Claim 28 words
A high-intensity electric discharge lamp unit according to Claim 1, wherein said photoelectric converter is provided with a photoelectric conversion element disposed near said high-intensity electric discharge lamp.
Claim 3
Dependent Claim 44 words
A high-intensity electric discharge lamp unit according to Claim 1, wherein said photoelectric converter is provided with a first photoelectric conversion element for receiving the light emitted by the high-intensity electric discharge lamp, and a second photoelectric conversion element for receiving the ambient light.
Claim 4
Dependent Claim 38 words
A high-intensity electric discharge lamp unit according to Claim 2, wherein said controller controls the lighting condition of the high-intensity electric discharge lamp when the photoelectric conversion element receives the light emitted by the high-intensity electric discharge lamp.
Claim 5
Dependent Claim 30 words
A high-intensity electric discharge lamp unit according to Claim 3, wherein said controller turns of the high-intensity electric discharge lamp when the second photoelectric conversion element receives the ambient light.

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