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Extra-high pressure discharge lamp lighting device

A technology for lighting devices and discharge lamps, which can be applied to discharge lamps, gas discharge lamps, parts of gas discharge lamps, etc., and can solve problems such as promoting flickering

Active Publication Date: 2005-06-01
USHIO DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, even with such a method of superimposing current at regular intervals to perform lighting control, stable discharge may not always be possible, and flicker may actually be promoted instead.

Method used

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  • Extra-high pressure discharge lamp lighting device
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  • Extra-high pressure discharge lamp lighting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] figure 1 The overall structure of the short arc type high pressure discharge lamp (hereinafter simply referred to as "discharge lamp") of the present invention is shown.

[0039]The discharge lamp 1 has a substantially spherical light-emitting portion 10 formed by a discharge vessel made of quartz glass, and in the light-emitting portion 10, an anode 2 and a cathode 3 are arranged facing each other. In addition, seals 11 are respectively formed extending from both ends of the light-emitting portion 10, and conductive metal foils 4 usually made of molybdenum are buried in these seals 11 more closely than shrink seals, for example. One end of the metal foil 4 is connected to the anode 2 or the cathode 3, and the other end of the metal foil 4 is connected to the external lead 5.

[0040] In the light emitting unit 10, mercury, rare gas, and halogen gas are enclosed.

[0041] Mercury is used to obtain the required visible light wavelength, for example, radiation with a wavele...

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PUM

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Abstract

The invention provides a lighting device for an ultra-high pressure discharge lamp, which can suppress the flickering phenomenon and perform stable lighting. It is characterized in that it consists of an ultra-high pressure discharge lamp and a power supply device that supplies a direct current to the discharge lamp to light it. As for the counter electrode, 0.15 mg / mm3 or more of mercury, a rare gas, and a halogen in the range of 1×10-6 to 1×10-2 μmol / mm3 are enclosed in the arc tube. The power supply device supplies a current in which a periodic pulse current is superimposed on the direct current to the discharge lamp, and increases the corresponding pulse current when the lighting voltage of the corresponding discharge lamp rises.

Description

Technical field [0001] The invention relates to an ultra-high pressure discharge lamp lighting device. In particular, it relates to a lighting device used in a projection device such as a liquid crystal display device using an ultra-high pressure mercury lamp as a light source or a DLP (digital light processor) such as a DMD (digital reflector device). 0.15mg / mm is enclosed in the tube 3 For the above mercury, the mercury vapor pressure at the time of lighting is 110 atmospheres or more. Background technique [0002] The projection type projection device is required to make the image bright with uniform and sufficient color rendering for a rectangular screen. Therefore, as a light source, a metal halide lamp containing mercury or metal halide is used. In addition, such metal halide lamps have recently been further developed in terms of further miniaturization and point light sources, and devices with extremely small distances between electrodes have been put into practical use. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/24H01J61/00H01J61/073H01J61/16H01J61/20H01J61/54H05B41/18
Inventor 堀川好广杉谷晃彦冈本昌士
Owner USHIO DENKI KK