JPH0711793U - Surge absorbing element and substrate support used for the same - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a reliable and small defect absorption surge absorbing element and a substrate support used for the purpose of eliminating contact failure due to distortion during glass welding. A conductive connecting portion (3) connected to the terminal electrodes (63) at both ends of a substrate (60) and the connecting portion (3) are formed integrally with each other, and their outer contours are in connection with each other. Connecting surface (2a) extending in a direction substantially perpendicular to the base plate (60) and abutting against the inner peripheral surface (67i) of the glass tube (67) and to which the tip of the lead wire (66) is connected. The substrate (60) and the lead wire (66) are connected to each other via the substrate support tool (1) including the flange portion (2) having the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a surge absorber, and more particularly to a substrate support for a surge absorber formed by enclosing a substrate having a spark gap in a glass tube.

[0002]

[Prior art]

 In various electric appliances such as telephones, communication equipment, etc., surge absorbing elements are mounted and arranged in the circuit for the purpose of absorbing surge. The surge absorbing element has a structure in which a spark gap having a constant gap (for example, 50 μm) is provided in order to absorb a high voltage serge by discharge, and a discharge is generated therebetween.

Conventionally, there are various types of surge absorbing elements. For example, JP-B-63-57018, JP-A-58-198884, JP-B-01-24879 and the like. A typical example thereof is shown in FIG. 3. A conductive thin film 51 is formed on the surface of a cylindrical insulating base tube 50, and this thin film is removed by laser light or the like to form a spark cap 52. . Both electrodes 53 are formed at both ends, and a lead wire 54 for connecting to an external circuit is connected to each of the electrodes 53. Then, the whole structure including the base tube 50 and the electrode 53 is placed in the glass tube 55, the inner space 56 thereof is filled with an inert gas, and then both ends 55e are melted and hermetically sealed. Was there.

By the way, in order to improve the surge absorbing element having such a structure and improve the productivity, the applicant of the present invention has previously proposed a surge absorbing element having another structure. The details will be given to the previous application (Japanese Patent Application No. 4-82550), the main constitution of which is as shown in FIG. That is, a discharge electrode 62 having one or a plurality of spark gaps 61 patterned by a conductive thin film attached by a printing means on the surface of a rectangular flat plate-like substrate 60 made of an insulating material such as ceramics. And the terminal electrode 63 are formed. Next, the terminal electrodes 63 located at both ends of the substrate 60 are provided with substantially U-shaped connecting terminals 64, and a dimet wire (copper coated iron nickel) as a metal for glass sealing is attached to each of the connecting terminals 64. A lead wire 66 for circuit connection is connected via an (alloy wire) 65. Then, all of them are placed in a glass tube 67, and the inside is filled with an inert gas or the like, and both ends 67e are heat-melted to be welded to the outer peripheral surface of the Jimet wire 65 and hermetically sealed. .

[0005]

[Problems to be solved by the device]

 Since such a surge absorbing element forms the spark gap 61 patterned by the printing means, it is effective in terms of productivity, discharge voltage stability, and the like. However, there remains a problem in sealing such a structure in the glass tube 67. That is, when the both ends 67e of the glass tube 67 are welded, the both ends 67e are pressed, so that the contact point between the connection terminal 64 and the dimet wire 65 is stressed, and the connection point is distorted (arrow a), or There was a risk that a defective product would occur due to isolation and disconnection.

In order to solve the above problems, the present application aims to eliminate contact defects due to distortion during glass welding by further improving the connection terminals, and to provide a reliable and small surge absorbing element with a low defect rate. A substrate support used for this purpose is provided.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the surge absorbing element of the present application and the substrate support used for the same are configured as follows. It is composed of a substrate in which a conductive thin film is arranged on the upper surface of a rectangular flat plate having an insulating property and one or more spark gaps are formed, and lead wires respectively connected to the terminal electrodes at both ends of the substrate. In a surge absorbing element configured by encapsulating the entire substrate and lead wire connecting portion in a glass tube, a conductive connecting portion connected to the terminal electrodes at both ends of the substrate, and integrally formed with the connecting portion. At the same time, the outer contour of the flange portion extends in a direction substantially perpendicular to the substrate at the time of connection and is in contact with the inner peripheral surface of the glass tube, and has a connection surface to which the tip of the lead wire is connected. The substrate and the lead wire are connected via a substrate support comprising

The substrate support used here is formed of a conductive material, and has a flat plate-shaped flange portion having a substantially circular or polygonal outer contour. One side of the flange portion is formed. In addition, a connecting portion is integrally formed of a conductive material having elasticity, and the connecting portion includes a pair of tongue pieces opposed to each other with a constant gap in a direction substantially perpendicular to the surface of the flange portion. Is formed to extend to.

Further, in forming the pair of tongue pieces, although they may be formed as separate bodies, a notch is formed with a constant width from the outer peripheral end faces of the flange portion facing each other, and the notch pieces are formed in a direction substantially perpendicular to the face of the flange portion. It may be bent to face each other.

[0010]

【Example】

 Next, an example of a concrete implementation of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing the configuration of the surge absorbing element of the present invention, and FIG. 2 is a vertical sectional view of the surge absorbing element of the present invention. The structure of the substrate, and the discharge electrode and the terminal electrode on the upper surface thereof is the same as the structure of the above-described surge absorbing element already proposed by the applicant of the present application, and therefore, the same numbers are attached and the details thereof are omitted. Similarly, the Jimmet wire and the lead wire are omitted.

The substrate support 1 attached to the terminal electrode 63 of the substrate 60 is composed of a flange portion 2 and a connecting portion 3. The flange portion 2 is formed of a conductive material such as metal and has a substantially disk-shaped outer contour that can abut the inner peripheral surface 67i of the glass tube 67. The connection part 3 is integrally formed of the same material as the flange part 2, and a pair of flat plate-shaped tongues 3a and 3b are extended from the surface of the flange part 2 with their surfaces opposed to each other at a constant interval. It is composed of This fixed interval is set to be slightly smaller than the thickness of the substrate 60. The tongue pieces 3a, 3b are formed by cutting the opposing outer peripheral end surfaces 2s of the flange portion 2 toward the center portion with a constant width and bending the same so as to be substantially perpendicular to the surface of the flange portion 2. Has been done. The tip of the upper tongue piece 3a is curved downwardly. As a result, the tongues 3a and 3b, which are elastically formed, are attached by sandwiching the terminal electrode 63 of the substrate 60 from above and below and by crimping, so that the connecting portion 3 and the terminal electrode 63 are electrically connected. Will be connected. In addition, a connection surface 2a is formed on the rear surface side of the connection portion 3 of the flange portion 2 to which the end surface 65e of the Jimmet wire 65 abuts and is connected.

By configuring the substrate support 1 as described above, when the glass tube 67 is annularly attached and both ends 67e are pressed while being thermally melted, the outer peripheral end surface 2s of the flange portion 2 is It comes into contact with the inner peripheral surface 67i of 67. As a result, the flange portion 2 serves as a support, and the flange portion 2 and the substrate 60 can be maintained in a perpendicular positional relationship. This means that the substrate 60 always coincides with the axial direction of the glass tube 67, and an unreasonable stress is applied to the contact portion between the dimet wire 65 and the flange portion 2, in other words, in the direction in which the substrate support 1 is bent. The force (arrow a) stops working.

In this embodiment, the outer shape of the flange portion 2 is circular. However, the shape is not limited to this, and the outer shape of the glass tube 67, which is generally circular, can be abutted on the inner peripheral surface 67i. It may be polygonal such as prismatic, octagonal and the like. When the glass tube has a rectangular cross section, it may be formed in conformity with this. Furthermore, the flange portion 2 and the connecting portion 3 do not always have to be integrally formed, and it goes without saying that a method of forming them separately and integrating them may be used.

[0014]

【effect】

 The present invention has the following effects with the above configuration. Since the flange portion is in contact with the inner peripheral surface of the glass tube, this serves as a support, and the strain caused by the pressing force at the time of welding can be avoided. Therefore, it is possible to manufacture a stable surge absorbing element with a low defect rate. That is, the yield of products can be improved.

In addition, since the flange has a wide area to be connected to the dimet wire and the tongue of the connection portion holds the substrate at a substantially right angle, the dimet wire and the substrate are firmly held and the inside of the glass tube is secured. There is an advantage that it can be supported on the axis of. As a result, the connection between the substrate and the lead wire can be easily and surely made through the substrate support, and the workability can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a surge absorbing element of the present invention.

FIG. 2 is a vertical sectional view of a surge absorbing element of the present invention.

FIG. 3 is a vertical sectional view of a surge absorbing element showing a conventional example.

FIG. 4 is a perspective view of a surge absorbing element showing a conventional example.

[Explanation of symbols]

1 ... Substrate support 2 ... Flange 2
a ... connecting surface 2s ... outer peripheral end surface 3 ... connecting portion 3
a, 3b ... Tongue piece 60 ... Substrate 61 ... Spark gap
62 ... Discharge electrode 63 ... Terminal electrode 65 ... Dimet wire 6
6 ... Lead wire 67 ... Glass tube

Claims (3)

[Scope of utility model registration request] 1. A conductive thin film is disposed on an upper surface of a rectangular flat plate having an insulating property, and one or a plurality of spark gaps (6).
A substrate (60) on which 1) is formed, and lead wires (66) respectively connected to the terminal electrodes (63) at both ends of the substrate,
A surge absorbing element comprising the substrate (60) and the lead wire connection portion (65) enclosed in a glass tube (67), the terminal electrodes (63) at both ends of the substrate (60). And a conductive connecting part (3) connected to the connecting part (3) and the connecting part (3) are integrally formed with each other, and the outer contour of the connecting part (3) extends in a direction substantially perpendicular to the substrate (60) at the time of connection. Flange portion (2) having a contact surface (2a) that is in contact with the inner peripheral surface (67i) of the glass tube (67) and to which the tip (65) of the lead wire (66) is connected.
A surge absorbing element, characterized in that the substrate (60) and the lead wire (66) are connected via a substrate support (1) comprising 2. A flat plate-shaped flange portion (2) formed of a conductive material and having a substantially circular or polygonal outer contour is formed, and one surface side of the flange portion (2) is provided. The connecting portion (3) is integrally formed of a conductive material having elasticity, and the connecting portion (3) includes a pair of tongue pieces (3a, 3b) opposed to each other with a constant gap, A substrate support for a surge absorbing element, which is formed so as to extend from the surface of the flange portion (2) at a substantially right angle. 3. In forming a pair of tongue pieces (3a, 3b), a notch is formed with a constant width from the outer peripheral end faces (2s) of the flange part (2) facing each other, and the notch part is formed as a surface of the flange part (2). The substrate support of the surge absorbing element according to claim 2, wherein the substrate support is bent in a substantially perpendicular direction to face each other.