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Quartz valve for double ended discharge lamp

A quartz tube, discharge lamp technology, applied in discharge lamps, gas discharge lamps, high pressure discharge lamps, etc., can solve the problems of lamp life influence, high price, and high material cost

Inactive Publication Date: 2010-08-04
IWASAKI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In this way, by lighting with a high tube wall load, high efficiency is obtained. However, due to the operation at high temperature and high pressure, the impurity gases and impurities contained in the electrode material or quartz material give a great impact on the life of the lamp. influences
[0014] Therefore, in order to achieve high efficiency of the lamp and obtain a long life at the same time, not only high-purity electrode materials must be used, but also high-purity quartz must be used for the quartz tube shell. However, this high-purity quartz is different from the current Very high price compared to technical quartz
[0015] In particular, in the case of manufacturing the above-mentioned tipless lamp, the quartz bulb has to be formed sufficiently longer than the actual lamp in connection with cutting off both ends thereof, and the part to be finally cut off and discarded must also be cut. It is necessary to use an extremely expensive high-purity quartz tube, so there is a problem of high material cost

Method used

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  • Quartz valve for double ended discharge lamp
  • Quartz valve for double ended discharge lamp
  • Quartz valve for double ended discharge lamp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] figure 1 In the illustrated quartz envelope 1 for a double-ended discharge lamp, a cavity 3 as a light emitting portion is formed between a pair of straight tube portions 2A, 2B formed on both ends of the quartz tube in the longitudinal direction.

[0050]The straight pipe portions 2A, 2B form sealing tubes 4A, 4B that hermetically seal the chambers in the state where the electrode holder M is inserted into the chamber 3 side, and at the same time, the portion on the top end side forms the sealing pipes 4A, 4B that seal the chambers. The air supply / exhaust pipes 5A, 5B removed after sealing 4A, 4B are cut off.

[0051] In addition, the gas supply / exhaust pipes 5A, 5B are connected to an exhaust system (not shown in the figure) such as a vacuum pump and an enclosed gas supply system (not shown in the figure) when manufacturing the lamp, and play a role before sealing. The role of the exhaust flow path of the remaining gas in the chamber 3 and the supply flow path of th...

Embodiment 2

[0064] Figure 4 represents another embodiment. Additionally, for figure 1 Duplicate parts are assigned the same reference numerals, and detailed description thereof will be omitted.

[0065] Such as Figure 4 As shown in (a) to (c), the difference between the quartz tube shell 11 for the double-ended discharge lamp of this example and Embodiment 1 is that the quartz tube shell 11 for the double-ended discharge lamp of this example forms a two-stage structure, The two-stage structure includes: a main section P consisting of a central part 11C of a quartz tube and an end part 11B of a quartz tube. 1 , and an auxiliary section P consisting of another quartz tube end 11A 2 .

[0066] And, the main segment P 1 Formed from high-purity quartz, auxiliary section P 2 Shaped from low-purity quartz.

[0067] In addition, for the main segment P 1 The length can be arbitrarily selected according to the needs: such as Figure 4 Shown in (a), it is shorter than the combined lengt...

Embodiment 3

[0070] Figure 5 Another example is further shown. In the quartz bulb 21 for a double-ended discharge lamp of this example, the thickness of the air supply / exhaust pipes 5A, 5B, which are cut and removed after sealing the sealing pipes 4A and 4B, can be formed thin, so that Reduce waste of low-purity quartz in order to reduce material costs.

[0071] for Figure 5 (a)~(c) The length of the central part 21C of the quartz tube is formed shorter than the combined length of the chamber 3 and the sealing tubes 4A and 4B, and the quartz tube end 21A (21B) and the sealing tube 4A The outer diameter of the part (4B) is formed thick, and the part of the air supply / exhaust pipe 5A (25B) is formed thin.

[0072] for Figure 5 In the lower part of (a) to (c), the length of the central part 21C of the quartz tube is formed to be equal to the combined length of the chamber 3 and the sealing tubes 4A, 4B, and the quartz tube used as the gas supply / exhaust tube 5B (5A) is formed. The tube...

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PUM

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Abstract

A production cost of a double ended discharge lamp is reduced while keeping lamp characteristics and a lamp lifetime equivalent to those when a quartz bulb is made of high purity quartz. The quartz bulb (1) is constituted in such a way that a pair of straight tube portions (2A, 2B) formed by communicating sealing tubes (4A, 4B) for sealing an electrode mount (M) with supply / exhaust tubes (5A, 5B) that are cut off after sealing is formed on the opposite end sides of a chamber (3) that becomes a light emitting portion. In the quartz valve, quartz tube end portions (1A, 1B) including the whole or a part of the supply / exhaust tubes (5A, 5B) are formed continuously at the quartz tube central portion (1C) including a portion that forms the inner surface (3a) of the chamber entirely, and one or both of the quartz tube end portions (1A, 1B) are made of lower purity quartz compared with that of the quartz tube central portion (1C).

Description

technical field [0001] The present invention relates to a quartz envelope for a double-ended discharge lamp. In the quartz envelope, both ends of a quartz tube serving as a light-emitting chamber are formed in the middle, and a sealing pipe and a gas supply / exhaust pipe are formed. Straight pipe department. Background technique [0002] At present, the double-ended high-pressure discharge lamps generally used in headlights for automobiles or backlights for projectors, etc., when the thickness distribution of the discharge tube is uneven, there is a risk of rupture during operation under high temperature and high pressure. , Therefore, a quartz envelope with uniform thickness distribution without exhaust pipe residue (tip) is used for the light emitting part. Since no tip is formed on the quartz envelope, it is called a tipless lamp. [0003] Such a double-ended discharge lamp uses a quartz envelope 51, such as Figure 6 As shown in (a), between a pair of straight pipe porti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/30H01J61/86
CPCH01J9/266H01J9/38H01J9/247H01J61/86H01J61/302
Inventor 大河原亮山本将二
Owner IWASAKI ELECTRIC CO LTD