JPS63136456A - Mercury vapor discharge lamp - Google Patents

Abstract

PURPOSE:To improve reliability and a lamp characteristic by using two species of a material for attaching importance to corrosion-proof performance and of a material for attaching importance to hermetical performance, as sealing materials by which a transmitting ceramics is sealed with block matters on both sides of the ceramics. CONSTITUTION:A luminous bulb 1 of a transmitting alumina ceramic member is hermetically brazed and sealed with block matters 4 and 4', which are equipped with electrodes 2, 2' and lead wires for external use 3, 3', by the use of sealing materials 5, 5' and 6, 6' on both ends of the bulb. The sealing materials 5 and 5' on the internal surface side of the luminous tube, part of these two species of sealing materials, are made of rare earth oxides such as Al2O3.SiO2 and La2O3.Y2O3 as main components, and they are excellent in halogen-proof performance but smaller in coefficients of thermal expansion than alumina ceramics. On the other hand, the sealing materials 6 and 6, on the external surface side of the luminous tube are made of Al2O3.CaO.Y2O3 as a main component and the coefficients of thermal expansion for them are identical with that for alumina ceramics.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to metal vapor release using an arc tube in which both ends of a translucent ceramic tube are hermetically sealed with a closing body and a metal or metal compound is sealed inside. It concerns electric lights.

BACKGROUND OF THE INVENTION High-pressure Li-1 lamps using a translucent ceramic tube as an arc tube envelope and utilizing sodium vapor discharge are well known as lamps with excellent luminous efficiency and life characteristics. In addition, metal halide lamps, which use a transparent quartz glass tube as the outer envelope of the arc tube and encapsulate a metal halide, have lower luminous efficiency than high-pressure sodium lamps, but are widely used as high T+ color lamps, mainly for indoor lighting. has been done. However, these high-pressure 1-lium lamps and metal halide lamps each have their own advantages and disadvantages, and do not have satisfactory performance.

Recently, metal halide lamps have been attempted in which a light-transmitting ceramic tube, which is used in high-pressure sodium lamps, is used as an envelope and a metal halide is sealed inside. Translucent ceramic has superior heat resistance and halogen resistance compared to quartz glass, and can therefore increase the thermal pressure of metal halides in the arc tube, improving luminous efficiency and life characteristics. . However, unlike a quartz glass tube, a translucent ceramic tube cannot be heat-softened and crushed and sealed, so a light-emitting tube end closure is used and the closure and the translucent ceramic tube are sealed. It has a shape that is hermetically sealed by brazing it with a material. In addition, conventionally, as a closure body, a translucent ceramic tube with excellent halogen resistance has been used. A molded product is used in which a conductive ceramic or a conductive metal film is sandwiched inside a ceramic in which the i skewers are substantially aligned.

Problems to be solved by the invention However, using such a translucent ceramic tube,
In a fully refractory vapor discharge lamp with a metal halide sealed inside, Al2O3・CaO or Al2O3・M, which is conventionally commonly used in high-pressure sodium lamps, is used.
When a sealing material containing IIO as a main component is used, although it has excellent airtightness, it has poor halogen resistance, and the metal halogen and other metal halogens are consumed during lamp lighting, resulting in a large change in lamp characteristics, making it unusable. Therefore, as a sealing material with excellent halogen resistance, Al103. SiO2 and Y201, La,
, 03 and other rare earth oxides are used as one component, and the composition ratio of each is varied, but the melting point is 13
00・〜1! At an appropriate value of +00℃, the higher the halogen resistance, the more the coefficient of thermal expansion of the translucent ceramic tube and the closing body tends to be different. However, there was a problem in that the soldering between the translucent ceramic tube and the closure body caused premature leakage.

Means for Solving the Problems The present invention provides a metal vapor discharge lamp using an arc tube in which both ends of a translucent ceramic tube are hermetically sealed with a closing body and a metal or a fully curved compound is sealed inside. Between the translucent ceramic tube and the closing body, a sealing material with excellent corrosion resistance against the arc tube inclusions is used on the inner surface of the arc tube, and a sealing material with excellent airtightness is used on the outer surface of the arc tube. By brazing the
1 lamp of gold 11 with poor reliability and lamp characteristics, 1
5, there is provided a metal halide lamp in which a metal halide is enclosed in an arc tube.

Actually! Example A The details of the present invention will be explained below with reference to the illustrated embodiments.

FIG. 1 is a sectional view showing an embodiment of the arc tube of a 250 watt metal halide lamp according to the present invention, and FIG.
FIG. 2 shows an enlarged sectional view of one end of the arc tube shown in the figure. 1 and 2, a semi-closed type arc tube bulb 1 made of a translucent alumina ceramic tube and integrally molded with ring-shaped alumina ceramic members made of the same material at both ends, with an inner diameter of 16 mm and a height of 50 mm. At both ends of
A closure body 4.4' to which electrodes 2, 2' and external leads 13.3' are attached is hermetically sealed by sealing materials 5.5' and 6.6'. The closing body 4.4' is made by integrally sintering a conductive metal film 7 between aluminum ceramic sheets to provide airtightness and the function of the electric conductor 11. In addition, the sealing material 5.5' on the inner surface of the arc tube is Al2O3.
It is mainly composed of rare earth oxides such as 5102, La2O3, and Y203, and has excellent halogen resistance.
Since the content of l02 is high, the coefficient of thermal expansion is smaller than that of alumina ceramic. The sealing material 6.6' on the outer surface of the arc tube is mainly composed of Al2O3.CaO.Y2O3, and is made of a material whose coefficient of heat m3 closely matches that of alumina ceramic. The arc tube bulb 1 is filled with mercury, metal halides such as notrium iodide and scandium iodide, and argon gas (not shown) as a starting rare gas.

In addition, as described above, the arc tube bulb is made with the ring-shaped sealing material 5.5' on the inside and the sealing material 6.6' on the outside. 1 and obturator 4.4
', and simultaneously heated with rB at a temperature of about 1,300 to 1,500°C in a vacuum or an inert gas atmosphere in an argon shade. In this case, in order to further improve halogen resistance and airtightness, the molten layer of the sealing material R1 between the arc tube bulb 1 and the closing body 4.4' should be made as thin as possible, and the sealing material eluted into the arc tube should be kept as thin as possible. It is preferable to reduce the surface area of @5.5' as much as possible, and these may be adjusted depending on the type of sealing material, heating method, and end structure of the arc tube. Further, in this method, it is preferable that the melting points of the sealing materials 5.5' and 6.6' be as close as possible in order to suppress mutual diffusion of the components of the sealing material.

Next, the arriving material 5.5' on the inner surface side of the arc tube is used as the first arriving material, the sealing material 6.6' on the outer surface side of the arc tube is used as the second IJ adhesive material, and the first and second sealing materials are Table 1 shows an example of the results of tests made by manufacturing lamps using various types of materials and weight ratios.

As is clear from Table 1, when alumina ceramic and a material with a well-matched airtight coefficient were used for both the first and second arriving materials as in Test No. 61, the resistance to It can be seen that due to the poor antibacterial properties, the melon halide is consumed during lamp lighting, and the lamp characteristics change significantly at an early stage. In addition, when materials with excellent halogen resistance are used for both the first and second arriving materials as in test N002,
Because the thermal expansion coefficients of the alumina ceramic and the sealing material do not match, the heat caused by flashing lamps causes premature brazing.
It can be seen that leakage or peeling occurs at the tap part, resulting in poor airtightness. However, as in Tests No. 013 to 9, a halogen-resistant material was used as the first arriving material, and a material with excellent airtightness that had a thermal expansion coefficient well matched with that of alumina ceramic was used as the second sealing material. , and when the ratio thereof is adjusted, it can be seen that the attachment [ ] by the first sealing material suppresses the thermal stress applied to the part, and improves the airtightness and halogen resistance in this part. Furthermore, even if a leak occurs only in the brazed portion of the first sealing material, the halogen resistance can be improved by setting the minimum ratio of the first sealing material to the second sealing material to be 228 or more. It is also considered that the contact with the second arriving material, which is inferior in quality, is slight and the influence on the Okawa-L lamp characteristics can be ignored. This is the first seal M't
Similar results were obtained when Δ1203 .SiO 2 .La 2 O 3 or the like was used as A. Therefore, we intentionally changed the component ratio of the first arriving material to bring its thermal expansion coefficient closer to that of alumina, or used JQ, TlO, which has poor halogen resistance.
There is no need to add more than necessary additives such as No. 2, etc., and the components (ratios) can be made with emphasis on halogen resistance and melting point.

FIG. 3 is a sectional view of one end of the arc tube showing another embodiment of the metal scrap vapor discharge lamp according to the present invention.

In this embodiment of the present invention, as in FIG. 2, a +m closing body made of conductive ceramic and having an ffi pole 2 attached thereto is hermetically brazed with arriving materials 5 and 6 to the arc tube bulb 1. This closing body 8 is made by firing and solidifying alumina powder and, for example, tungsten.
It has a thermal expansion coefficient similar to that of alumina and is electrically conductive.

It should be noted that the present invention is not limited to the use of a total halogen compound as the filling material in the arc tube as in the above embodiments, but it is also possible to use a metal compound other than the total halogen or halogen such as sodium or cesium as the filling material in the arc tube. The same effect can be obtained even if the material is made of alumina, and materials other than alumina can also be used as the arc tube bulb and the closing body.

Effects of the Invention (Details above) As mentioned above, the mfA air discharge lamp according to the present invention has a 211i! ! Divided into
By applying these to the same bamboo seal, the defects of each seal material are compensated for, and the seal is highly reliable with excellent lamp characteristics and TF life characteristics.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the arc tube of the metal halide lamp according to the present invention, FIG. 2 is an enlarged sectional view of one end of the arc tube of FIG. 1, and FIG. FIG. 2 is a cross-sectional view of one end of the arc tube, not showing the embodiment. 1... Arc tube bulb, 2.2'... Electrode, 4.4'
...Closing body, 5.5', 6.6'...Sealing material λ
1 Ward direction 2 Diagram

Claims (1)

[Claims] In a metal vapor discharge lamp using an arc tube in which both ends of a translucent ceramic tube are hermetically sealed with a closing body and a metal or metal compound is sealed inside, a light emitting A metal vapor discharge lamp characterized in that a sealing material with excellent corrosion resistance against the contents of the arc tube is used on the inner surface of the tube, and a sealing material with excellent airtightness is used and brazed on the outer surface of the arc tube. .