JPH03165007A - Manufacture of glass-sealed thermistor - Google Patents

Abstract

PURPOSE:To facilitate the connection of lead wires and to facilitate the positioning of glass by using tubular glass by holding both electrode surfaces of a thermistor element wherein the electrodes are formed on both facing surfaces with the tips of two lead parts of a frame lead, connecting the electrode surfaces and the tips, and thereafter sealing the thermistor element containing the tips of the lead parts with the glass in an airtight pattern. CONSTITUTION:Both electrode surfaces 12 and 13 of a thermistor element 11 are held with the tip parts of lead parts 16 and 17 so that the electrode surfaces are in contact with lead parts 16 and 17 of a frame lead 14 and further connected by parallel gap welding. Then, tubular glass 18 is mounted so as to cover the thermistor element 11 and the tip parts of the lead parts 16 and 17. The tubular glass 18 is overheated and fused in an electric furnace. The tubular glass 18 is welded to the thermistor element 11 and the tip parts of the lead parts 16 and 17. The thermistor element 11 is sealed with the welded glass 18a in an airtight pattern. Since the thermistor element 11 is held with the lead parts 16 and 17 in this way, the thermistor element 11 can be readily fixed mechanically. Furthermore, since the position relationship of the lead parts 16 and 17 is fixed with a frame part 15, the separation of the thermistor element 11 hardly occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a glass-sealed thermistor which is used as a temperature sensor for home appliances, housing equipment, automobile equipment, etc., and is particularly useful in fields where high heat resistance is required. This relates to a manufacturing method.

BACKGROUND ART Conventionally, this type of glass-encapsulated thermistor has been manufactured by a method as shown in FIG. In FIG. 2, 1 is a thermistor element with electrodes 2 and 3 formed on opposing surfaces;
After connecting the tips of the lead wires 4 and 5 to the double-sided electrodes 2 and 3 from the same direction, glass 6 that has been previously processed into a cap shape is heated and melted to connect the thermistor element 1 and the lead wires 4.5. The glass 6 is welded to the tip including the part, and the glass 6 to which the thermistor element body 1 is welded is
This was the manufacturing method in which the container was hermetically sealed in step (a).

Problems to be Solved by the Invention These conventional manufacturing methods have the following problems.

(1) When connecting the thermistor body and lead wire,
The lead wires must be connected individually to the thermistor body, and the peel strength of the lead wires is weak, making the lead wire connection process complicated and leading to frequent lead wire peeling failures, making it difficult to improve productivity. It was becoming a big problem.

(2) Since two lead wires were attached to the thermistor body in parallel, accurate positioning of the glass was not possible when a tube glass was used in a glass set. Therefore, it is necessary to thermally process the tube glass into a cap shape in advance so that accurate positioning can be performed simply by covering the thermistor body.

The present invention solves these problems and provides a method for manufacturing a glass-sealed thermistor in which the thermistor body and lead wire can be easily connected and the glass can be easily positioned even when using a tube glass. The purpose is to

In order to solve this problem, the method for manufacturing a glass-sealed thermistor of the present invention provides a method for manufacturing a glass-sealed thermistor, in which both electrode surfaces of a thermistor body, in which electrodes are formed on opposing surfaces, are connected to two sides of a frame lead. After connecting the ends of the lead parts of the book by pinching them together, the thermistor body including the ends of the lead parts is hermetically sealed with glass, and in the above structure, two of the frame leads The lead portion is characterized by having a portion where the lead spacing is widened or a convex portion projecting outward.

Effects According to this configuration: (1) Since the thermistor element is held between the lead parts of the frame lead, the thermistor element is easily mechanically fixed to the lead parts. Furthermore, since the positional relationship of the lead portions of the frame leads does not change even if there is a slight change, the thermistor element hardly ever comes off.

(2) If the lead portion of the frame lead is configured to have a portion where the lead spacing is widened or a convex portion that projects outward, positioning can be easily performed by simply covering the frame lead with a tube glass at the portion.

Therefore, according to the present invention, it is possible to provide a method for manufacturing a glass-sealed thermistor in which the thermistor body and the lead wire can be easily connected and the glass can be easily positioned even if a tube glass is used.

Example An embodiment of the present invention will be described below.

FIG. 1 is a diagram illustrating a method of manufacturing a glass-sealed thermistor according to an embodiment of the present invention.
Reference numeral 1 designates a thermistor element having electrodes 12 and 13 formed on opposing surfaces, and a frame lead 14 has a pair of lead parts 16 and 17 protruding from a frame part 15. The root portions of the lead portions 16° 17 are formed with a wider interval than the tip portions, and the lead portions 16 having such a shape
．． 17 are connected to the frame portion 15 and protrude in large numbers.

Then, both electrode surfaces 12 and 13 of the thermistor body 11 are held between the tips of the lead parts 16 and 17 of the frame lead 14 made of nickel-plated iron-nickel alloy, etc., so that they are in contact with the lead parts 16 and 17, and further parallel Connect by gap welding. Next, a glass tube 18 is placed over the thermistor body 11 and the tips of the lead portions 16 and 17, and the glass tube 18 is heated and melted in an electric furnace (not shown), thereby removing the thermistor body 11 and the leads. Welding the tube glass 18 to the tip of the portions 16 and 17,
The manufacturing method is such that the thermistor body 11 is hermetically sealed with a welded glass 18a.

As described above, according to this embodiment, since the thermistor body 11 is held between the lead portions 16.17 of the frame lead 14, the thermistor body 11 is easily mechanically fixed to the lead portions 16.17. Furthermore, the positional relationship between the lead portions 16 and 17 of the frame lead 14 is fixed by the frame portion 15 and will not come off even with slight changes, and the thermistor body 11 will hardly come off.

In addition, when the tube glass 18 is placed over the thermistor body 11 and the tip of the lead portion 16.17, the lead portion 16.1
The part where the distance between the numbers 7 is widened serves as a stopper for the glass tube 18, and the position of the glass tube 18 can be easily positioned.

Here, instead of providing the lead portions 16, 17 with wider intervals, a lead portion having a convex portion projecting outward may be used.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained, and the practical value thereof is great.

(1) Since the thermistor element is held between the lead parts of the frame leads, the thermistor element is easily mechanically fixed to the lead parts, and the process of connecting the thermistor element and the leads is simplified.

C) The positional relationship of the lead portions of the frame lead is fixed by the frame portion and does not move even with slight changes, so the thermistor element hardly comes off during handling, and productivity is dramatically improved.

(3) When covering the thermistor body and the tips of the leads with a tube glass, the part where the gap between the leads is wide becomes a stopper for the tube glass, so it is not necessary to use glass that has been processed into a cap shape in advance (but usually Positioning can be done easily using the tube glass, reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a method of manufacturing a glass-encapsulated thermistor according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a conventional method of manufacturing a glass-encapsulated thermistor. 11...Thermistor element, 12.13...
...Electrode, 14...Lead frame, 15...
...Frame part, 16.17...Lead part, 18...Tube glass, 18a...Glass.

Claims (2)

[Claims] (1) After connecting both electrode surfaces of the thermistor element, which has electrodes formed on opposite surfaces, between the ends of the two lead parts of the frame lead, the thermistor element including the ends of the lead parts is placed on glass. A method for manufacturing a glass-sealed thermistor that is hermetically sealed. (2) The method for manufacturing a glass-sealed thermistor according to claim (1), wherein the lead portion of the frame lead has a portion where the lead spacing is widened or a convex portion that projects outward.