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discharge lamp

A technology for discharge lamps and discharge vessels, which is applied in the direction of discharge lamps, gas discharge lamps, parts of gas discharge lamps, etc. It can solve problems such as deterioration of production efficiency, complicated work procedures, and reduction of transmittance, and achieves suppression of accumulation of thermal deformation , Prevent breakage, prevent blackening effect

Active Publication Date: 2016-01-20
ORC MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the contrary, when there is too little thorium, the electron emission ability of the cathode cannot be improved
[0013] On the other hand, the process of coating aluminum oxide on the inner surface of the discharge tube is also a complicated operation process, which deteriorates production efficiency.
In addition, even if coating is performed, the thermoformed discharge tube itself has heat, so due to the influence of heat, sufficient coating performance cannot be satisfied, and the transmittance decreases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] The discharge lamp of this example corresponds to the discharge lamp described in the first embodiment.

[0095] Figure 7 are enlarged electron microscope photographs of the anode side before and after spraying. Such as Figure 7 As shown in (A), the side surface of the anode is substantially smooth before the spray treatment. On the other hand, the side surface of the anode after the blasting process was in a matte rough state (pear-skin state), and had fine unevenness. exist Figure 7 In the enlarged photograph of (B), a portion where alumina is sharply pierced, a portion where electrode fragments are attached, and a portion where alumina hits the side surface of the anode and is fixed in a state of being bitten are photographed.

Embodiment 2

[0097] This example corresponds to the discharge lamp of the second embodiment.

[0098] Figure 8 It is an enlarged electron microscope photograph of the anode surface of the discharge lamp of this example observed from above. Figure 9 It is an enlarged electron microscope photograph of the anode surface observed from an oblique direction.

[0099] according to Figure 8 , Figure 9 It can be seen that fine grooves whose groove pitch is larger than the groove width are formed on the surface of the anode along the circumferential direction. Furthermore, a large amount of alumina is firmly embedded and adhered to the portion of the fine groove.

Embodiment 3

[0101] The discharge lamp of this example corresponds to the discharge lamp described in the fifth embodiment.

[0102] An experiment was conducted to confirm the effect of suppressing blackening of the arc tube when alumina was attached to the surface of the anode. The short-arc discharge lamp of the example has a luminous tube made of quartz glass with an outer diameter of 121 mm and a volume of 885 cc. Mercury of about 30 mg / cc is enclosed in the luminous tube. In addition, argon gas is enclosed so that it becomes approximately 190 kPa at room temperature.

[0103] The anode is a tungsten electrode containing approximately 0.002% potassium by weight. The cathode is doped with about 2% by weight thorium oxide (ThO 2 ) tungsten cathode, the distance between the electrodes is set to about 12mm. The shapes of the anode and the cathode are substantially the same as those shown in the above-mentioned embodiment. A tapered front end is formed on the cathode.

[0104] Alumina...

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Abstract

PROBLEM TO BE SOLVED: To prevent blackening of a discharge container without involving any complicated process.SOLUTION: Alumina is jetted onto an outer peripheral surface (side surface) 30C of an anode 30 by shot blast, and the alumina 26 is adhered to the outer peripheral surface 30C in a dispersed state. The anode 30 is heat-treated in vacuum at a temperature equal to or lower than the melting point of the alumina 26 to remove impurity gas. When lighting of a lamp is started, the alumina 26 is melted and evaporated with a rise in temperature of the anode 30. Then, the evaporated alumina is adhered to an inner surface of a light-emitting tube.

Description

technical field [0001] The present invention relates to a discharge lamp in which an electrode is arranged in an arc tube, and particularly relates to a surface structure of an electrode used in a high intensity discharge lamp (HID lamp) such as a short-arc discharge lamp. Background technique [0002] In a short-arc discharge lamp, a cathode and an anode are arranged facing each other in a discharge tube made of quartz glass, and electrons are emitted from the cathode to the anode to generate an arc discharge and emit light from the discharge. As an electrode material, tungsten (W) with a high melting point is generally used in order to prevent melting of the electrode during lighting. [0003] In addition, as for the cathode used in the high-intensity discharge lamp, thorium oxide (ThO 2 ) tungsten cathode (commonly referred to as a thoriated tungsten cathode) (for example, refer to Patent Documents 1 and 2). [0004] During arc discharge, the temperatures of the cathode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J61/073
CPCH01J61/073H01J61/16
Inventor 林武弘
Owner ORC MFG