JP3078681B2 - Tube ball - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulb such as a halogen bulb used for lighting or infrared rays.

[0002]

2. Description of the Related Art Conventionally, a halogen bulb used for lighting or infrared rays is provided with a molybdenum-introduced foil as a sealing body between both ends of a straight tube-shaped bulb made of quartz glass by pinch sealing. Are buried and sealed, and the inner conductor connected to these introduction foils is introduced into the bulb, and a tungsten filament is mounted between them. In addition, the other end of the introduction foil is connected to an outer conductor formed by, for example, drawing a molybdenum wire from the end of the sealing portion to the outside. I have.

To manufacture such a halogen bulb,
First, an inner conductor and an outer conductor are welded to both ends of the introduction foil to form an introduction conductor, and then a tungsten filament is connected between the respective inner conductors of the two introduction conductors to form a mount, and then this filament is mounted. The introduced conductor is extended into the quartz glass bulb, and both ends of the quartz glass bulb are heated and pinched to form a sealing portion, and the introducing foil is embedded in the sealing portion. At this time, the very thin introduction foil is hermetically sealed to the sealing portion. Shrinks more, and a minute gap is generated between the two. Then, the interior of the bulb is evacuated and filled with an inert gas and halogen to complete the bulb.

[0004]

When such a halogen lamp is turned on, the temperature of the sealing portion becomes high, and the sealing member gradually enters the space formed in the outer peripheral portion of the outer conductor of the sealing portion due to the existing air. Oxidation causes poor conduction at the weld between the introduction foil and the outer conductor, oxidizes the sealing body, increases the volume, and eventually causes cracks in the sealed part, causing damage or loss of airtightness, etc. The lamp becomes defective.

[0005] Oxidation of the introduction foil due to the invasion of air always occurs as long as the introduction conductor having the introduction foil and the non-sealing outer conductor is used. This is because molybdenum is used as the introduction conductor. An object of the present invention is to provide a bulb which is free from oxidation of the introduced conductor due to intrusion of air.

[0006]

According to the present invention, there is provided a tube which emits light.
Pinch and seal the end of the glass bulb containing the member.
Seal the lead-in conductor in the pinched sealing part of
Introduced foil hermetically sealed to the sealing part and connected to this introduced foil
And the sealing portion
Lead oxide is formed in the voids generated on the outer circumference of the outer conductor inside.
And a filler mainly composed of a compound of tin oxide and boron oxide
Filling, the thermal expansion coefficient of the filler is 60 × 10 ^-7~ 70 × 10
^-7/ ° C and the Young's modulus is 70 to 75 GPa
It is characterized by the following.

[0007]

According to the structure of the present invention, the void formed in the outer peripheral portion of the outer conductor is filled with a filler mainly composed of a compound of lead oxide, tin oxide and boron oxide, thereby preventing air from entering. In addition, it is possible to prevent the introduction foil from being oxidized by touching the air. Further, the thermal expansion coefficient of the filler material 60 × 10 ^over 7-70
× 10 ^{over 7} / ° C., since the Young's modulus in the range of 70～75GPa, when the lamp turns off, the lamp filler is contracted cold, cracked filler can be prevented from occurring.

[0008]

1 and 2 show a halogen lamp according to an embodiment of the present invention. In these figures, a molybdenum-introduced foil 3 buried in a sealing portion 2 in which both ends of a straight tube-shaped valve 1 made of transparent quartz glass are pinched and sealed has an inner conductor 4 made of a refractory metal wire such as tungsten. Are connected, and a tungsten filament 5 is stretched between these inner conductors 4 by an anchor. Outer conductor 7 is molybdenum-introduced foil 3
, And are led out of the sealing portion 2 to the outside.
A minute gap 8 is formed in the outer peripheral portion of the outer conductor 7 due to a difference in coefficient of thermal expansion with the bulb 1.
Is filled. A required halogen is sealed in the bulb 1 together with an inert gas such as argon. Note that the introduction foil 3 and the inner conductor 4 and the outer conductor 7 connected to both ends thereof are collectively referred to as an introduction conductor.

In the sealing step, when the molybdenum-introduced foil 3, the inner conductor 4 and the outer conductor 7 are pinched and sealed in the bulb 1 in the sealing step, the softened quartz glass gradually cools during the process of cooling. Since the coefficient of thermal expansion of the molybdenum constituting the outer conductor 7 is larger than that of the quartz glass, the outer conductor 7 contracts more than the sealing portion 2.
Becomes The gap 8 formed in this manner is usually about 0.1 to 0.2 mm, extends along the outer conductor 7, and communicates with the outside world, as shown in an enlarged view in FIG.

The filler 9 is mainly composed of a compound of lead oxide, tin oxide and boron oxide and has a coefficient of thermal expansion of 60.
× 10 ^-7 to 70 × 10 ^-7 / ° C, Young's modulus is 70 to 75
GPa (1 GPa = 1 × 10 ⁹ Pa). In order to obtain such a filler 9, a required distribution of lead oxide, tin oxide, boron oxide, and other additives are mixed and heated.
A glassy solid is made and then ground to a powdered glass. This powder glass and a binder obtained by mixing about 1% of nitrocellulose with isoamyl acetate are mixed to form a slurry. Then, the slurry is dropped at a point where the outer conductor 7 is led out from the sealing portion 2. Then, the slurry penetrates and fills the gap 8 by capillary action. And 1
After drying at about 00 ° C., it is heated at a temperature of about 300 ° C. to drive off nitrocellulose. Thus, the filler 9 is fired. Thereafter, the temperature is raised to 450 ° C., and the filler is used as the amorphous filler 9.

When the halogen bulb is turned on, the operating heat is transmitted to the sealing portion 2, and the filled filler 9 is heated. If the temperature does not exceed the melting point of the filler 9, the filler 9 is not melted, fills the gap 8 in the outer peripheral portion of the outer conductor 7, and keeps the molybdenum-introduced foil 3 and the outer conductor 7 in the sealing portion airtight. The oxidation of the molybdenum-introduced foil 3 and the outer conductor 7 can be prevented.

A comparative test was carried out on a halogen lamp having the structure of the above embodiment and having a life of 2,000 hours (hereinafter referred to as the present invention) in a sealed portion temperature of 380 ° C. in an atmosphere without a filler. The product of the present invention filled with the material 9 showed no oxidation on the surface of the molybdenum-introduced foil even after lapse of 2,000 hours. On the other hand, in the conventional product, the molybdenum-introduced foil was oxidized only under the same conditions for 500 to 900 hours, lost airtightness, and a break occurred.

Further, when a comparative test was performed in an atmosphere at a sealing portion temperature of 450 ° C., no oxidation was observed on the surface of the molybdenum-introduced foil after 1000 hours had passed. In addition, no crack occurred in the sealing portion 2. On the other hand, under the same conditions,
After only 500 hours, the molybdenum-introduced foil was oxidized, lost airtightness, and a break occurred.

The present invention is not limited to the halogen bulb, but may be applied to other bulbs. The introduction conductor may have the introduction foil 3 and the non-sealing outer conductor 7 connected to the introduction foil 3, and the inner conductor 4 may have a configuration in which the introduction foil 3 is extended. Furthermore, the introduction foil 3 is not limited to the molybdenum introduction foil and may be made of tungsten.

[0015]

According to the structure of the present invention, the void formed in the outer peripheral portion of the outer conductor is filled with a filler mainly composed of a compound of lead oxide, tin oxide and boron oxide, so that the invasion of air is prevented. To prevent oxidation of the foil by contact with air. Further, the coefficient of thermal expansion of the filler is 60 × 10 ^{−7 to} 7
0 × 10 ^{over 7} / ° C., since the Young's modulus in the range of 70～75GPa, when the lamp turns off, the lamp filler is contracted cold, cracked filler can be prevented from occurring . Therefore, the life of the bulb is not shortened due to oxidation of the foil and the outer conductor.

[Brief description of the drawings]

FIG. 1 is a sectional view of a tube according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of a tube according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve 2 Sealing part 3 Introducing foil 4 Inner conductor 5 Filament 7 Outer conductor 8 Void 9 Filler

Claims (1)

(57) [Claims] 1. A bulb in which an end portion of a glass bulb accommodating a light emitting member is pinched and sealed, and an introduction conductor is sealed in the pinched sealing portion, wherein the introduction conductor is hermetically sealed in the sealing portion. In addition to the attached introduction foil and the inner conductor and the outer conductor connected to the introduction foil, the void portion generated in the outer peripheral portion of the outer conductor in the sealing portion is formed of lead oxide, tin oxide, and boron oxide. compound filled with a filler mainly, in the thermal expansion coefficient of the filler is 60 × 10 ^{over 7} to 70 × 10 ^{over 7} / ° C.,
A tube characterized by having a Young's modulus of 70 to 75 GPa.