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Ultrahigh pressure mercury lamp and ultrahigh pressure mercury lamp lighting apparatus

A technology for lighting devices and mercury lamps, which is applied to high-pressure discharge lamps, lighting devices, discharge lamps, etc., can solve the problems of reduced illuminance and deformation of electrodes 90, and achieve the effects of suppressing deformation and maintaining high illuminance

Active Publication Date: 2011-03-23
USHIO DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the heat generated at the tip of the electrode 90 is conducted to other parts of the electrode 90 to become overheated, and deformation occurs in the electrode 90. Therefore, there is a problem that the illuminance decreases with the lapse of the lighting time.

Method used

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  • Ultrahigh pressure mercury lamp and ultrahigh pressure mercury lamp lighting apparatus
  • Ultrahigh pressure mercury lamp and ultrahigh pressure mercury lamp lighting apparatus
  • Ultrahigh pressure mercury lamp and ultrahigh pressure mercury lamp lighting apparatus

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experiment example

[0104] according to Figure 1 ~ Figure 4 With the configuration shown, AC lighting type lamps (A) to lamps (F) having the following specifications were produced. In addition, in the following specifications, the arc tube, the distance between electrodes, the material of the enclosure, and the electrodes are common specifications for all lamps.

[0105] The luminous tube is made of quartz glass, and the inner volume of the luminous part is 0.0825cm 3 .

[0106] The distance between electrodes was 1.1 mm.

[0107] Mercury, rare gas, and bromine as a halogen are enclosed in the luminous tube, and the amount of mercury enclosed is 0.29mg / mm 3 , the halogen filling amount is 3×10 -3 μmol / mm 3 .

[0108] The electrodes are made of tungsten with a purity of 5N, and other specifications are shown in Table 1 below.

[0109] The input power is 275W.

[0110] Table 1

[0111]

[0112] For the lamps (A) to (F), an alternating current with a stable lighting frequency of 370 Hz ...

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Abstract

The present invention provides an ultrahigh pressure mercury lamp and an ultrahigh pressure mercury lamp lighting apparatus in which deformation of an electrode is suppressed and a high illuminance maintenance rate thereof can be obtained, even though it is lit for a long time. In the ultrahigh pressure mercury lamp that encloses mercury is enclosed in an arc tube, an electrode has a head portion whose diameter is larger than that of an axis portion and a cylindrical portion formed to project from and extend, integrally with a back end face of the head portion, wherein an inner circumference face the cylindrical portion is apart from the axis portion so as to surround the axis portion. During an alternating current lighting, a relational expression of d / (1 / f)1 / 2>=3.8 is satisfied, wherein a frequency, which relates to an anode operation period that is the longest in the anode operation period during which one electrode serves as an anode, is represented as f, and a distance in an axial direction from the leading edge position of the head portion of the electrode to a boundary position between the head portion and the cylindrical portion is represented as d.

Description

technical field [0001] The present invention relates to a short-arc ultrahigh-pressure mercury lamp, and more specifically, to a super high-pressure mercury lamp suitable as a backlight for projection projectors such as a DLP (Digital Light Processing: registered trademark) using a DMD (Digital Mirror Device: registered trademark). Lighting devices for high-pressure mercury lamps and ultra-high-pressure mercury lamps. Background technique [0002] In projection projectors such as DLP (Digital Light Processing: registered trademark) using DMD (Digital Mirror Device: registered trademark), it is required to project an image with uniform and sufficient color rendering on a rectangular screen. Therefore, as a light source, a short-arc ultra-high pressure mercury lamp whose mercury vapor pressure at the time of lighting is, for example, 150 atmospheres or more is used. [0003] In addition, as lamps for ultraviolet exposure and illumination of optical instruments, short-arc ultr...

Claims

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Application Information

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IPC IPC(8): H01J61/073H05B41/14F21Y101/00
CPCH05B41/2887Y02B20/202H01J61/0732H01J61/86Y02B20/00
Inventor 后藤一浩山下高史
Owner USHIO DENKI KK
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