JPH0969415A - Thermistor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize electric characteristics by a method wherein the aperture part of two cylindrical cases are junctioned by the cylindrical cases, having a terminal on bottom part and a tabular thermistor element which forms an electrode on both main surfaces, and the electrode of the thermistor element to be housed is brought into contact with the terminal of the cylindrical cases. SOLUTION: The first case main body 14, having a bottom part 14b and a plurality of protrusions 14c inside a cylindrical part 14a, and the first cylindrical case 11, consisting of the first springlike metal terminal 16, are formed on one end side of a thermoplastic resin cylindrical part 14a. Electrodes 13a and 13b are formed on both tabular main surfaces of a thermistor element. The aperture parts of two first cylindrical cases 11 are connected, a case is formed, and the thermistor element 13 is housed in the internal space of the case 11. The side face of the thermistor element 13 is brough into contact with a plurality of protrusions 14c on the inside of the cylindrical part 14a of the first case main body 14, and space is provided between the side face and the cylindrical part 14. The first terminal 16 is integrally molded with the first cylindrical terminal 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermistor device used in a current control circuit such as a degaussing circuit of a cathode ray tube of a color monitor or a color television, a starting circuit of a motor and the like.

[0002]

2. Description of the Related Art A conventional thermistor device is shown in FIG. The thermistor device of this conventional example is composed of a case 1, thermistor elements 2 and 3, spring terminals 4 and 5, and a flat terminal 6.

The case 1 comprises a bottomed cylindrical case body 1a and a lid 1b for covering the opening of the case body 1a. Through holes 1c, 1d, 1e are provided at the bottom of the case body 1a.

The thermistor elements 2 and 3 have electrodes 2 on both main surfaces.
It is a thermistor element having a plate-shaped positive resistance temperature characteristic in which a, 2b, 3a and 3b are formed.

The spring terminals 4 and 5 are composed of spring portions 4a and 5a and lead portions 4b and 5b. The spring portions 4a and 5a are arranged inside the side portions of the case body 1a, and the lead portions 4b and 5b are arranged. A through hole 1c at the bottom of the case body 1a,
It is led out of the case main body 1a via 1d.

The flat terminal 6 includes a flat plate portion 6a and a lead portion 6b.
The flat plate portion 6a is arranged substantially in the center of the internal space of the case body 1a, and the drawer portion 6b is led out of the case body 1a through the through hole 1e at the bottom of the case body 1a.

In the thermistor device, the thermistor element 2 is sandwiched between the spring portion 4a of the spring terminal 4 and one surface of the flat plate portion 6a of the flat terminal 6, and the thermistor element 3 has the spring portion 5a of the spring terminal 5 and the flat plate portion of the flat terminal 6. It is housed in the case body 1a in a state of being sandwiched by the other surface of 6a, and the opening of the case body 1a is covered with the lid body 1b.

[0008]

However, the above-mentioned conventional thermistor device has the following problems.
That is, there is a gap between the through holes 1c, 1d, 1e of the case body 1a and the lead-out portions 4b, 5b, 6b.
Flux, active gas, etc. may enter inside to make the electrical conduction between the electrodes 2a, 2b, 3a, 3b of the thermistor elements 2, 3 and the spring terminals 4,5, flat terminals 6 unstable.
The electrodes 2a, 2b, 3a and 3b of the thermistor elements 2 and 3 are deteriorated and the electrical connection with the spring terminals 4,5 and the flat terminals 6 becomes unstable. Further, when the thermistor device is used in a circuit of a television or the like, there is a problem that rattling noise is generated in the thermistor device itself due to vibration during operation of the speaker.

Further, when the spring terminals 4, 5 and the flat terminals 6 are provided with narrow width portions to add a fuse function, the lead portions 4b,
There is a problem that 5b and 6b are weak in strength.

Therefore, an object of the present invention is to solve the above-mentioned problems, and it is hermetically sealed with no gap between the case and the lead-out portion of the terminal, and
Provided is a thermistor device in which a drawer part is firmly fixed to a case.

It is another object of the present invention to provide a thermistor device which does not reduce the mechanical strength of the terminal even if the terminal is formed with a narrow portion and a fuse function is added.

[0012]

To achieve the above object, in a thermistor device of the present invention, a first cylindrical case having a bottom portion and a plate-like thermistor having electrodes formed on both main surfaces thereof are provided. An element and the first tubular case has a first terminal on the bottom thereof, and the first tubular case has two first tubular cases, the openings of which are joined to each other to form a case, The thermistor element is housed in the case, and the electrode of the thermistor element is in electrical contact with the first terminal of the first tubular case.

A first cylindrical case having a bottom portion,
It comprises a second cylindrical case having both ends opened and a plate-like thermistor element having electrodes formed on both main surfaces thereof, and the first cylindrical case has a first terminal at the bottom thereof. The second tubular case has a second terminal substantially in the center of the internal space thereof, and the second tubular case is N (N
1 or more), and the first tubular case is provided on both ends thereof, and adjacent openings of the first tubular case and the second tubular case are joined to form a case. It is configured such that (N + 1) thermistor elements are accommodated in the case, and each electrode of the thermistor element is in electrical contact with the first terminal or the second terminal. .

Further, the first terminal is composed of a spring portion and a lead-out portion, and the spring portion is arranged at the bottom of the first tubular case, and the first tubular case is provided outside the first tubular case. It is characterized in that the drawer portion is led out.

The second terminal comprises a flat plate portion and a lead portion, and the second tubular case has the flat plate portion disposed substantially in the center of the internal space thereof, and the second terminal
The drawer portion is led out to the outside of the cylindrical case.

The first terminal is embedded inside the first tubular case except for the spring portion and the lead-out portion, and the second terminal except the flat plate portion and the lead-out portion. It is characterized in that it is embedded inside the second tubular case.

Furthermore, the first terminal or the second terminal is provided with a narrow width portion in a conduction path from the spring portion or the flat plate portion to the drawer portion, and the conduction path is the first passage.
Is embedded in the cylindrical case and the second cylindrical case, and the narrow portion is exposed from a cutout portion provided in the first cylindrical case and the second cylindrical case. It is characterized by

As a result, the case can be unitized for each function, and can be applied to various types of thermistor devices.
Further, since the terminals and the case are hermetically sealed, it is possible to obtain a thermistor device having stable electrical characteristics and mechanical characteristics such as terminal pitch.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described in detail below with reference to FIGS. The thermistor device includes a first cylindrical case 11 and a thermistor element 13.
Consists of

The first tubular case 11 is made of a thermoplastic resin such as polyphenylene sulfide (PPS), polybutyl terephthalate (PBT), 6-6 nylon, polyethylene terephthalate (PET) or the like. And a leg portion 15 and a first terminal 16 made of a spring metal such as stainless steel or phosphor bronze.

The first case body 14 has a bottom portion 14b at one end of the tubular portion 14a and a plurality of protrusions 14 inside the tubular portion 14a.
c, the leg portion 15 is provided outside the tubular portion 14a, and the leg portion 15 is formed with a cutout portion 15a including a through hole or a cutout.

The first terminal 16 comprises a spring portion 16a, a lead portion 16b and a flat plate portion 16c. The spring portion 16a is provided with an annular body 16d so as to surround the outer side thereof, and the spring portion 16a and the annular body 16d are bent by 180 ° with respect to the flat plate portion 16c, so that the annular body 16d forms an outer peripheral portion of the flat plate portion 16c. The spring portion 16a is positioned substantially at the center of the flat plate portion 16c and is bent so as to be separated from the flat plate portion 16c. Spring 16a and drawer 1
A narrow width portion 16e having a width narrower than that of the lead portion 16b is formed between the conduction path 6b, specifically, the flat plate portion 16c and the lead portion 16b.

The first cylindrical case 11 is obtained by insert molding using the first terminal 16. That is, the flat plate portion 16c of the first terminal 16 is disposed at the bottom portion 14b of the first case body 14, and the annular body 16d is insert-molded so as to overlap the outer edge portion of the flat plate portion 16c. The conduction path from the flat plate portion 16b to the lead-out portion 16b is embedded in the leg portion 15 of the first tubular case 11, and the narrow width portion 16e of the first terminal 16 is connected to the leg portion 1.
The lead-out portion 16b is disposed in the cutout portion 15a provided in the first portion 5 and is exposed, and the lead-out portion 16b is led out from the lower end of the leg portion 15. At this time, the spring portion 16a of the first terminal 16 is located in the internal space of the cylindrical portion 14a of the first case body 14 and is located in the bottom portion 1a.
It is projected from 4b. The first terminal 16 has the spring portion 16a, but the spring portion 16a is not covered with the resin during insert molding because the flat portion 16a is not covered with the resin.
This is because c serves as a resin stopper. This enables resin molding of the bottom portion 14b of the first tubular case 11.

The thermistor element 13 has electrodes 13 on both main surfaces of a thermistor element body having a plate-like positive or negative resistance temperature characteristic.
a and 13b are formed. Thermistor element 1
When 3 is a thermistor element having a positive resistance temperature characteristic,
For example, the electrodes 13a and 13b are composed of two layers, and the lower layer has N
It is preferable that an ohmic electrode such as i is formed and an electrode containing Ag as a main component having a gap G1 is formed in the upper layer from the side edge of the thermistor element body.

In the thermistor device, two first cylindrical cases 11 are joined to each other by welding, adhering, fitting or the like at their openings, and the thermistor element 13 is placed in the inner space of the case. It was housed.

In such a thermistor device, the electrodes 13a and 13b of the thermistor element 13 have the first electrodes inside the case.
Of the cylindrical cases 11 (L) and 11 (R) respectively come into contact with the spring portions 16a (L) and 16a (R), and are electrically connected to the lead portions 16b (L) and 16b (R). . The two first cylindrical cases 11 shown in FIG. 1 are distinguished by adding (L) to the left side and (R) to the right side after the reference numerals.

The cylindrical portion 14 of the first case body 14
A plurality of protrusions 14c provided inside a contact the side surface of the thermistor element 13 so that a space is provided between the side surface of the thermistor element 13 and the cylindrical portion 14a. Prevents heat transfer to.

Further, since the case is divided in the thickness direction of the thermistor element 13, the electrodes 13a, 1 of the thermistor element 13 are assembled in assembling the thermistor device.
Since the spring portion 16a does not slide with respect to 3b, the electrode 13
The a and 13b are not scraped off.

Furthermore, since the first terminal 16 is integrally formed with the first tubular case 11, the first terminal 16 is fixed to the first tubular case 11 and is drawn out. The distance between the parts 16b (L) and 16b (R) becomes constant.

Next, a second embodiment according to the present invention will be described in detail with reference to FIGS. However, the first
The same parts as those of the embodiment will be designated by the same reference numerals, and detailed description thereof will be omitted. This thermistor device comprises a first tubular case 11, a second tubular case 12, and thermistor elements 13 and 23.

The second cylindrical case 12 is made of, for example, PP.
It comprises a second case body 17 made of a thermoplastic resin such as S, PBT, 6-6 nylon, PET, etc., a leg portion 18, and a second terminal 19 made of a metal such as stainless steel. The second case body 17 has a tubular shape with both ends open, is provided with a plurality of protrusions 17c on the inside of the tubular shape, is provided with a leg portion 18 on the outside, and the leg portion 18 has a through hole. Alternatively, a cutout portion 18a including a cutout or the like is formed.

The second terminal 19 comprises a flat plate portion 19a and a lead portion 19b. The flat plate portion 19a has a plurality of protrusions 19c on its outer circumference. A narrow portion 19d having a width narrower than that of the lead portion 19b is formed between the flat plate portion 19a and the lead portion 19b.

The second cylindrical case 12 is obtained by insert molding using the second terminal 19. That is, the flat plate portion 19a of the second terminal 19 is arranged at a substantially central position of the internal space of the second case body 17,
The tip portion of the protrusion 19c provided on the outer peripheral portion of the flat plate portion 19a is embedded in the second case body 17. The conduction path from the flat plate portion 19a to the lead-out portion 19b is embedded in the leg portion 18 of the second tubular case 12, and the second terminal 19 is provided.
The narrow portion 19d of the leg portion 18 is exposed by being arranged in the notch portion 18a provided in the leg portion 18, and the lead-out portion 19b is formed in the leg portion 18a.
Is derived from the lower end of.

The thermistor element 23 has electrodes 23 on both main surfaces of a thermistor element body having a plate-like positive or negative resistance temperature characteristic.
a and 23b are formed. Thermistor element 2
When 3 is a thermistor element having a positive resistance temperature characteristic,
For example, the electrodes 23a and 23b are composed of two layers, and the lower layer has N
It is preferable that an ohmic electrode such as i is formed, and an electrode containing Ag as a main component having a gap G2 from the side edge of the thermistor body is formed in the upper layer.

In the thermistor device, two first cylindrical cases 11 and a second cylindrical case 12 are interposed between the first cylindrical cases 11 to form a case, and the openings are joined to each other to form a case. The elements 13 and 23 are accommodated.

In such a thermistor device, the electrodes 13a and 13b of the thermistor element 13 have the first electrode inside the case.
On one surface of the spring portion 16a (L) of the first terminal 16 arranged in the cylindrical case 11 (L) and the flat plate portion 19a of the second terminal 19 arranged in the second cylindrical case 12. They come into contact with each other and are electrically connected to the lead portions 16b (L) and 19b. Further, the electrodes 23a and 23b of the thermistor element 23 are arranged on the other surface of the flat plate portion 19a of the second terminal 19 arranged on the second cylindrical case 12 and on the first cylindrical case 11 (R). The spring portions 16a (R) of the first terminal 16 are brought into contact with each other and electrically connected to the lead portions 19b, 16b (R). The two first cylindrical cases 1 shown in FIG.
With respect to No. 1, (L) is added to the left side and (R) is added to the right side after the symbols to distinguish them.

The cylindrical portion 14 of the first case body 14
The plurality of protrusions 14c provided inside a and the plurality of protrusions 17c provided inside the second case body 17 abut on the side surfaces of the thermistor elements 13 and 23, so that the side surfaces of the thermistor elements 13 and 23 are A space is provided between the first case body 14 and the second case body 17 to prevent heat transfer to the case due to self-heating of the thermistor elements 13 and 23.

Next, a third embodiment according to the present invention will be described in detail with reference to FIG. However, the above-mentioned first and second
The same parts as those of the embodiment will be designated by the same reference numerals, and detailed description thereof will be omitted. This thermistor device comprises a first tubular case 11, a second tubular case 12, and thermistor elements 13, 23, 33.

The thermistor element 33 has electrodes 33 on both principal surfaces of a thermistor element body having a plate-like positive or negative resistance temperature characteristic.
a and 33b are formed. Thermistor element 3
When 3 is a thermistor element having a positive resistance temperature characteristic,
For example, the electrodes 33a and 33b are composed of two layers, and the lower layer has N
It is preferable that an ohmic electrode such as i is formed, and an electrode containing Ag as a main component having a gap G3 from the side edge of the thermistor body is formed in the upper layer.

In the thermistor device, two first tubular cases 11 and two second tubular cases 12 between them are joined together at their openings to form a case. The thermistor elements 13, 23 and 33 are accommodated in the space.

In the thermistor device, the electrodes 13a and 13b of the thermistor element 13 inside the case have the same shape as the first cylindrical case 11 (L) as in the first embodiment.
Spring portion 16a (L) of the first terminal 16 disposed on the second terminal 19 disposed on the second tubular case 12 (L)
Through the flat plate portion 19a (L) of the
(L) and 19b (L) are electrically conducted.

Electrodes 23a and 23b of the thermistor element 23
Is the flat plate portion 1 disposed in the second tubular case 12 (R).
9a (R), the spring portion 16a (R) arranged in the first cylindrical case 11 (R), and the drawer portion 19b.
(R) and 16b (R) are electrically conducted.

Electrodes 33a and 33b of the thermistor element 33
Is the flat plate portion 1 disposed in the second tubular case 12 (L).
9a (L), the lead-out portion 19b via the flat plate portion 19a (R) arranged in the second tubular case 12 (R).
It conducts to (L) and 16b (R). The two first tubular cases 11 and the second tubular case 12 shown in FIG.
With respect to the reference numerals, (L) is added to the left side and (R) is added to the right side after the reference to distinguish them.

The cylindrical portion 14 of the first case body 14
The plurality of protrusions 14c provided inside a and the plurality of protrusions 17c provided inside the second case body 17 contact the side surfaces of the thermistor elements 13, 23, 33, whereby the thermistor elements 13, 23 , 33 side and first
A space is provided between the case body 14 and the second case body 17 to prevent heat transfer to the case due to self-heating of the thermistor elements 13, 23, 33.

In the third embodiment, the two first cylindrical cases 11 (L), 11 arranged at both ends are provided.
During (R), the second cylindrical case 12 and the thermistor element 33 can be paired and increased appropriately. Furthermore, the electrical characteristics and shapes of the thermistor elements 13, 23, 33 used in the second and third embodiments are arbitrarily selected according to the desired application of the thermistor device. It is a thing.

Furthermore, by providing a through hole in the bottom portion 14b of the case and the like, the airtightness of the internal space of the case can be released and the volume change of the gas in the internal space of the case can be dealt with.

[0047]

As described above, in the thermistor device according to the present invention, since the first terminal and the second terminal are integrally molded in the first tubular case and the second tubular case, the case and the terminal lead-out are provided. Since the case is hermetically sealed with no gap between the parts, it is possible to prevent flux from entering the inside of the case during soldering to the circuit board. Further, it is possible to prevent harmful gas that deteriorates the contact portion between the electrode of the thermistor element and the first terminal and the second terminal from entering. Furthermore, the first terminal, the second terminal and the first tubular case, the second terminal
Since it is fixed to the cylindrical case, the rattling noise does not occur in the thermistor device.

Further, the first terminal or the second terminal is provided with a narrow portion, and both ends of the narrow portion are embedded in the leg portions of the first tubular case or the second tubular case. This has a fuse function of fusing when an overcurrent occurs, makes it difficult for heat from the thermistor element to be transferred to the lead portion, and reduces the lead portion of the first terminal or the second terminal by the narrow width portion. It is possible to prevent deterioration of mechanical strength.

Furthermore, since various combinations of cases can be constructed from the two types of tubular cases, the first tubular case and the second tubular case, any number of thermistor elements can be formed from these two types of tubular cases. The effect that a thermistor device corresponding to can be configured can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a thermistor device according to a first embodiment of the present invention.

2 (a) is a front view and FIG. 2 (b) is a vertical sectional view showing a first terminal.

FIG. 3 is an exploded perspective view of a thermistor device according to a second embodiment of the present invention.

FIG. 4 is a front view showing a second terminal.

FIG. 5 is an exploded perspective view of a thermistor device according to a third embodiment of the present invention.

FIG. 6 is a partial sectional view of a conventional example.

[Explanation of symbols]

11 1st cylindrical case 12 2nd cylindrical case 13,23,33 Thermistor element 13a, 13b, 23a, 23b, 33a, 33b
Electrode 14b Bottom part 15a, 18a Missing part 16 First terminal 16a Spring part 16b, 19b Lead-out part 16e, 19d Narrow part 19 Second terminal 19a Flat plate part

Claims (6)

[Claims] 1. A first tubular case having a bottom portion, and a plate-like thermistor element having electrodes formed on both main surfaces thereof, wherein the first tubular case has a first tubular case at its bottom portion. A terminal is provided, the two first cylindrical cases are joined together at their openings to form a case, and the thermistor element is housed in the case, and the electrode of the thermistor element is the first 1. A thermistor device, wherein the thermistor device is in electrical contact with the first terminal of the first cylindrical case. 2. A first tubular case having a bottom portion, a second tubular case having both ends opened, and a plate-like thermistor element having electrodes formed on both main surfaces thereof. The first tubular case has a first terminal on the bottom thereof, and the second tubular case has a second terminal substantially at the center of its internal space. N cases (N is 1 or more) are arranged,
The first tubular case is disposed at both ends thereof, and adjacent openings of the first tubular case and the second tubular case are joined to form a case, and the thermistor element is provided in the case. (N + 1) are accommodated and each electrode of the thermistor element is in electrical contact with the first terminal or the second terminal. 3. The first terminal includes a spring portion and a lead-out portion, and the first tubular case has the spring portion disposed at the bottom thereof and is external to the first tubular case. The thermistor device according to claim 1 or 2, wherein the drawer portion is led out. 4. The second terminal includes a flat plate portion and a lead portion, and the second tubular case has the flat plate portion disposed substantially in the center of an internal space thereof and the second tubular shape. The thermistor device according to claim 2, wherein the lead-out portion is led out to the outside of the case. 5. The first terminal is embedded inside the first tubular case except for the spring portion and the lead-out portion, and the second terminal except the flat plate portion and the lead-out portion. The thermistor device according to claim 3 or 4, wherein the thermistor device is embedded inside the second tubular case. 6. The first terminal or the second terminal is provided with a narrow width portion in a conduction path from the spring portion or the flat plate portion to the drawer portion, and the conduction path includes the first cylindrical case and It is embedded in the second tubular case, and the narrow portion is exposed from cutouts provided in the first tubular case and the second tubular case. The thermistor device according to claim 5.