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High-pressure sodium lamp

A high-pressure sodium lamp and yttrium oxide technology, which is applied in the direction of high-pressure discharge lamps, gas discharge lamp parts, etc., can solve the problems of high difficulty and high crack occurrence rate, prevent cracks, and inhibit the weakening and suppression of the bonding force of crystal grain boundaries. The effect of segregation of yttrium

Inactive Publication Date: 2007-02-28
PANASONIC CORP
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  • Abstract
  • Description
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Problems solved by technology

Moreover, when the tube wall load is increased to increase the tube wall temperature in order to achieve 'high efficiency', the occurrence rate of cracks is high, and it is quite difficult to achieve 'high efficiency and long life'

Method used

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Embodiment Construction

[0056] Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

[0057] As shown in Figure 1, the lamp input (rated power) of the embodiment of the present invention is a high-pressure sodium lamp 1 with a total length T of 360W. 1 245mm, outer diameter R 1 is 50mm. The high-pressure sodium lamp 1 includes a cylindrical outer tube 3 that is closed at one end and sealed at the other end by a sleeve 2, for example, made of hard glass, and a threaded lamp cap 4 installed on the side of the sleeve 2 of the outer tube 3. , the luminous tube 5 accommodated in the outer tube 3 and the well-known starting device 6 which is also accommodated in the position between the sleeve 2 and the luminous tube 5 in the outer tube 3 and is used to start the luminous tube 5 .

[0058] The central axis X of the outer tube 3 in the longitudinal direction almost coincides with the central axis Y of the arc tube 5 in the longitudinal directi...

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Abstract

Disclosed is a high-pressure sodium lamp comprising an arc tube (5) wherein electrode holding members (9) respectively having an electrode (14) on the front end are sealingly attached to both ends of an envelope (11) with a ceramic sealing material (13) containing yttrium and at least sodium as the light-emitting substance is sealed in the envelope. The envelope (11) is composed of a polycrystalline alumina ceramic to which at least magnesium oxide (MgO) and yttrium oxide (Y2O3) are added. Cracks in the end portions of the envelope can be prevented by having such a constitution, and thus the high-pressure sodium lamp can have high efficiency and long life.

Description

technical field [0001] The present invention relates to high pressure sodium lamps. Background technique [0002] High-pressure sodium lamps are widely used in road lighting and tunnel lighting because of their high efficiency and long life. [0003] Translucent translucent polycrystalline alumina ceramics are generally used as a material for peripheral devices constituting arc tubes of high-pressure sodium lamps. In this polycrystalline alumina ceramics, a trace amount of magnesia (MgO) is added in order to appropriately control the growth of crystal grains. [0004] It is known that the efficiency (1m / W) of this high-pressure sodium lamp varies with the tube wall load of the luminous tube (here, defined as when the input of the lamp is W (W), the inner diameter of the luminous tube is r (cm), and the distance between electrodes When the distance is L (cm), the value represented by the formula W / πrL) increases with the increase. This is because the temperature of the tub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/30H01J61/36H01J61/88
Inventor 桐生英明池田隆和田雅人
Owner PANASONIC CORP
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