JP2001284016A - Power supply components and heaters - Google Patents

Abstract

(57) Abstract: A hermetically sealed power supply component capable of supplying a large current of several tens of amperes is provided by a simple manufacturing method. Kind Code: A1 A quartz glass part, a hard glass part, and a functionally graded glass part connected to the quartz glass part and the hard glass part and having a gradually different expansion coefficient, and having a thickness of 0.7 to 1.5 m.
m, one end protrudes at least 10 mm from the glass tube 5 and is hermetically sealed with a hard glass part 7 at the other end, and the other end is a tapered part 6a.
And a hermetically sealed power supply component comprising a metal lead-in protruding at least 30 mm from the open end of the glass tube 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power supply component and a heater capable of supplying a large current of several tens of A or more.

[0002]

2. Description of the Related Art Hitherto, a so-called graded seal, in which a tungsten rod is sealed with hard glass, has been employed for hermetically sealing a projection xenon lamp requiring a large current. However, in this method, the distance from the arc, which is the center of heat generation, is inevitably determined from the heat resistance of the sealing part, that is, the thermal limit of the hard glass. Was difficult.

As a solution to this problem, metal foil is used for hermetically sealing quartz glass.
Japanese Patent Publication No. -30762 describes a high-pressure discharge lamp (conventional example) in which a plurality of metal foils are arranged in a cylindrical shape so that a current of several tens of amperes can flow.

[0004]

However, as in the prior art, the large current type foil encapsulation system has a complicated encapsulation structure, which makes the production complicated and makes it difficult to reduce the cost. is there. Further, when performing the hermetic sealing, the metal tube inserted into the glass tube may be oxidized because the glass tube is heated to the glass melting temperature in the air. Such oxidation of the electrical connection part causes an increase in contact resistance and the like, and causes a reduction in life reliability.

The present invention has been made in view of the above circumstances, and provides a hermetically sealed power supply part which can be manufactured at low cost without complicating the manufacture, and further has improved life reliability, and a heater using the same. The purpose is to do.

[0006]

According to a first aspect of the present invention, there is provided a functionally graded glass which is connected to a quartz glass portion, a hard glass portion, and a quartz glass portion and a hard glass portion and has a stepwise different expansion coefficient. Part, wall thickness 0.7-1.5
mm glass tube; penetrated inside the glass tube, one end protruding at least 10 mm from the glass tube and sealed with a hard glass part, the other end has a tapered part and protrudes at least 30 mm from the open end of the glass tube And a metal introduction line.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

The thickness of the glass tube is 0.7 to 1.5 m
m. This is because if the thickness is less than 0.7 mm, the mechanical strength of the hermetically sealed portion and the surroundings is reduced, and the function as the hermetically sealed component is impaired. Not only does the sealing property of the sealing portion deteriorate, but also the weight of the component increases, which is a factor that hinders reduction in size and weight. For these reasons, the preferred range of wall thickness is from 0.8 to 1.2 mm, more preferably from 0.9 to 1.1 mm.

The functionally graded glass portion allows a glass member having a thermal expansion coefficient between that of quartz glass and hard glass to be sealed stepwise. The glass tube is formed by connecting a quartz glass part, a functionally graded glass part, and hard glass and processing it into a cylindrical shape.

Preferably, the metal introduction wire is formed of a high melting point metal such as tungsten or molybdenum.
The linear expansion coefficient at 500 ° C. is 40 to 55 × 10 ⁻⁷ (c
m / cm / ° C) using a metal material.
It is preferable to maintain the adhesion to the hard glass.

The metal introduction wire is formed in a tapered shape over a length of 5 mm or more so that the other end is tapered.
By forming the tapered portion in this manner, connection with a component to which power is supplied can be achieved by press-fitting connection.

In addition, the metal introduction wire forms a glass coating before being hermetically sealed to the glass tube, and the glass coating on the side arranged in the glass tube is formed so as to be at least 10 mm or more from the sealing portion. Is preferable in order to maintain the airtightness of the glass tube and the metal introduction wire. The reason for setting the length to 10 mm or more is that if the length is less than 10 mm, distortion occurs in the hard glass portion near the hermetically sealed portion due to heat when brazing an external lead wire or the like, and the hermetically sealed portion such as a crack is formed. This is because a problem of impairment occurs, and it is more preferable to protrude about 15 mm. It should be noted that if the length is too long, the entire length of the component will be long.

The other end projects at least 30 mm from the glass tube. This length is 30 mm or more in order to secure a contact area with a conductive fiber bundle described later, and a preferable range is 30 to 50 mm, and if it is 50 mm or more, it is not preferable from the viewpoint of miniaturization. .

By setting the connection between the metal introducing wire and the glass tube as described above, the connection with a component to be supplied with power is facilitated, and the connection with a protection tube such as quartz glass is facilitated.

According to the first aspect of the present invention, the hermetic sealing between the metal introducing wire and the hard glass can be reliably performed by a relatively simple method. Further, by using such a metal introduction wire, a hermetically sealed power supply component that can withstand a large capacity of several tens of amps can be provided.

According to a second aspect of the present invention, in the hermetically sealed power supply component according to the first aspect, there is provided a heater for raising a temperature; a conductive fiber made of a conductive substance electrically connected to the heater; It is characterized by being press-fitted to the metal lead-in.

It is preferable to use a high melting point metal such as carbon or tungsten for the heater, and it is preferable that the heater and the outside atmosphere be kept airtight by using a protective tube such as quartz glass.

The conductive fiber allows a conductive substance such as carbon to be formed in a coil shape or a bundle shape. With such a configuration, it is possible to press-fit the tapered portion formed on the metal introduction wire of the hermetically-sealing power supply member, and the electrical connection can be performed by a simple method.

According to the second aspect of the present invention, it is possible to provide an inexpensive and compact heater.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a hermetically sealed power supply component according to the present invention will be described with reference to FIG. FIG. 1 is a front view showing the configuration of the hermetically sealed power supply component of the first embodiment.

The glass tube 5 has a linear expansion coefficient of about 33 × 10 ⁻⁷ (cm / cm / ° C.) on the side of the hermetic sealing portion 7 and a linear expansion coefficient of about 5 × 10 7 on the side of the opening 7a.
^-7 quartz glass (cm / cm / ℃), to no 10 linear expansion coefficient in the middle part ^{25 × 10 - 7 (cm /} cm /
C) glass is connected in three stages in a stepwise manner to provide a tilt function. In addition, glass tube 5
Has a thickness t1 in the range of 0.9 to 1.1 mm.

One end of the tungsten rod 6 protrudes by 15 mm from a hermetically sealed portion 7 sealed with the glass tube 5 and is electrically connected to the lead wire 2 by means such as brazing. A tapered portion 6 a is formed at the other end of the tungsten rod 6, and the length L 2 protrudes from the opening 7 A of the glass tube 5.
The length L2 is 30 mm or more in order to secure a contact area with a conductive fiber bundle described later, and a preferable range is 30 to 50 mm. However, when it is 50 mm or more, it is preferable from the viewpoint of miniaturization. Absent. The connecting portion between the lead wire 2 and the tungsten rod 6 is covered with an insulating coating 4, and by further covering the entire lead wire 2 with the insulating coating 3, it is insulated from the outside even when a large current is applied. Is secured.

The glass coating 1 is melt-connected to the tungsten rod 6 at the portion of the tungsten rod 6 to be hermetically sealed, so that airtightness with the glass tube 5 can be ensured. This glass coating 1 is formed 15 mm in the direction from the hermetic sealing portion 7 to the opening 7a.

According to the configuration of the hermetically sealed power supply component of the present embodiment, it is possible to provide a small and highly reliable hermetically sealed glass component with a simple configuration.

Next, a second embodiment of the heater according to the present invention will be described with reference to FIG. FIG. 2 is a front sectional view showing the configuration of the heater. In FIG. 2, the hermetically sealed power supply component described in the first embodiment is provided with openings at both ends of a quartz glass tube 11 having substantially the same dimensions as the opening 7a of the hermetic power supply component described in the first embodiment. 7a is connected and fused. At this time, the tapered portion 6a of the tungsten rod 6 is inserted into the conductive fiber bundle 8 provided inside the quartz glass tube 11, and is electrically connected to the filament 10 electrically connected to the taper 6a. Then, the inside can be kept airtight by further exhausting the inside.

According to these configurations, it is possible to provide a heater power supply component capable of obtaining stable characteristics for a long time.

[0027]

According to the first aspect of the present invention, the hermetic sealing between the metal introducing wire and the hard glass can be reliably performed by a relatively simple method. Further, by using such a metal introduction wire, a hermetically sealed power supply component that can withstand a large capacity of several tens of amps can be provided.

According to the second aspect of the present invention, a large-capacity heater that is inexpensive and small in size can be provided.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of a hermetically sealed power supply component according to the present invention.

FIG. 2 is a front view showing a second embodiment of the heater of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Glass coating 2 ... Lead wire 3 ... Insulating coating 4 ... Insulating coating 5 ... Glass tube 6 ... Tungsten rod 6a ... Taper part 7 ... Hermetically sealing part 7a ... Opening 8 ... Conductive fiber bundle 9 ... Holding tube 11 ... Quartz glass tube

Claims (2)

[Claims] A quartz glass part, a hard glass part, and a functionally graded glass part which is connected to the quartz glass part and the hard glass part and has a stepwise different expansion coefficient, and has a thickness of 0.7 to 1.5 m.
m glass tube; penetrated inside the glass tube, one end protruding at least 10 mm from the glass tube and sealed with a hard glass part, the other end has a tapered part and protrudes at least 30 mm from the open end of the glass tube And a metal introduction wire. 2. A heater for raising a temperature; conductive fibers made of a conductive substance electrically connected to the heater for raising a temperature;
A heater which is press-fitted and connected to a metal introduction wire of the hermetically sealed power supply component described in the above item.