JPH08250305A - Thrmistor device - Google Patents

Abstract

PURPOSE: To make it possible to package and enclose a thermistor element for protecting it from harmful atmosphere to electronic parts represented by reducing gas and high humidity of chlorine gas and hydrogen sulfide gas. CONSTITUTION: A thermistor device comprises a tubular case 12 and a thermistor element in a sheet shape, on both main surfaces of which electrodes are formed. Terminal sheets 12a are insulated from each other and arranged on at least part of the bottom surface facing the tubular case, the thermistor elements is contained inside the tubular case 12, and the electrodes of the thermistor element face the terminal sheets of the tubular case 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermistor device having a positive characteristic or a negative characteristic.

[0002]

2. Description of the Related Art A conventional thermistor device having a positive characteristic or a negative characteristic is constructed, for example, as shown in FIG. In other words, this thermistor device has the thermistor element 1
And a pair of terminals 2 and 3 and a cylindrical case 4.

The thermistor element 1 is composed of a plate-shaped ceramic having positive resistance temperature characteristics or negative resistance temperature characteristics and electrodes 1a and 1b formed on both main surfaces thereof. The pair of terminals 2 and 3 are made of conductive metal, and spring-like contact pieces 2a and 3a are provided at one ends of the terminals. The cylindrical case 4 is
The thermistor element 1 is made of an insulative resin and can accommodate the thermistor element 1. The side walls are provided with through holes 4a and 4b.

In the thermistor device having the above-described structure, the thermistor element 1 is sandwiched from both sides thereof by the contact pieces 2a, 3a which are one end of the pair of terminals 2, 3 and electrically connected to the tubular case 4 so as to be electrically conductive. , And the other ends of the pair of terminals 2 and 3 are led out to the outside through the through holes 4a and 4b of the cylindrical case 4.

[0005]

However, in the thermistor device having such a structure, a gap S is formed between the pair of terminals 2 and 3 and the through holes 4a and 4b of the cylindrical case 4. Therefore, when the thermistor device is used in an environment containing a reducing gas such as chlorine gas and hydrogen sulfide gas and in an environment with high humidity, the reducing gas and the moisture may cause the pair of terminals 2 and 3 and the through hole 4a. , 4b through the space S between them and the cylindrical case 4. Then, the electrodes 1a and 1b and the pair of contact pieces 2a and 3a formed on the thermistor element 1 undergo a reduction reaction or an oxidation reaction, which causes a problem that the electrical characteristics of the thermistor device are deteriorated.

An object of the present invention is to solve the above-mentioned problems, and to protect from an atmosphere harmful to a reducing gas such as chlorine gas or hydrogen sulfide gas or an electronic component represented by high humidity. Another object is to provide a thermistor device in which the thermistor element is hermetically housed.

[0007]

In order to achieve the above object, the thermistor device of the present invention comprises a cylindrical case and a plate-like thermistor element having electrodes formed on both main surfaces thereof. A terminal plate is disposed on at least a part of the bottom surface of the cylindrical case so as to be insulated from each other, the thermistor element is housed inside the cylindrical case, and the electrode of the thermistor element is a terminal plate of the cylindrical case. Is facing. Further, it is preferable that at least a part of the cylindrical case is made of an elastic body. Furthermore, it is preferable that at least a part of the tubular portion of the tubular case is made of a foil-shaped body.

[0008]

According to the present invention, with the above-described structure, the thermistor element is housed in the cylindrical case, and the electrode of the thermistor element and the contact portion between the electrode and the terminal plate are hermetically housed, so that the ambient air Not exposed.

[0009]

Embodiments of the thermistor device having a positive characteristic or a negative characteristic according to the present invention will be described below with reference to the accompanying drawings. [First Embodiment] As shown in FIGS. 1 and 2, the thermistor device comprises a thermistor element 11 and a cylindrical case 12.

The thermistor element 11 has electrodes 11a and 11b formed on both main surfaces of a disk-shaped ceramic having a positive resistance temperature characteristic or a negative resistance temperature characteristic. The cylindrical case 12 has a cylindrical shape, and the opposing bottom surfaces thereof are made of metal terminal plates 12a and 12b, and the cylindrical portion is made of a cylindrical elastic body 12c made of resin or the like that is insulative and elastically deformable. , 12b and the peripheral portion of the cylindrical elastic body 12c are connected to form a sealed internal space.

In the thermistor device having the above structure, the thermistor element 11 is housed in the inner space of the cylindrical case 12, and the electrodes 11a, 11 of the thermistor element 11 are accommodated.
The terminal plate 12 is a bottom surface of the cylindrical case 12 facing each other.
It faces a and 12b.

Such a thermistor device can be obtained, for example, by stacking the terminal plate 12a, the thermistor element 11 and the terminal plate 12b in this order, loading them in a resin molding die, and molding the cylindrical elastic body 12c with the resin. Therefore, the thermistor element 11 and the surfaces of the electrodes 11a and 11b facing the terminal plates 12a and 12b are hermetically housed inside the cylindrical case 12.

The thermistor device is, for example, as shown in FIG.
As shown in FIG. 5, the terminal plates 12a and 12b of the tubular case 12 are held between the clip terminals 13a and 13b having a spring property. That is, the clip terminals 13a and 13b press the terminal plates 12a and 12b toward the inside of the cylindrical case 12. Therefore, the electrodes 11a and 11b of the thermistor element 11 and the terminal plates 12a and 12 of the tubular case 12 are
Even if a gap K (shown in FIG. 2) is formed between the
The cylindrical elastic body 12c is compressed and deformed, and the one terminal plate 12a
Electrically contacts one electrode 11a of the thermistor element 11, and the other terminal plate 12b electrically contacts the other electrode 11b of the thermistor element 11.
2a and 12b function as external lead-out terminals of the thermistor device.

[Second Embodiment] As shown in FIGS. 4 and 5,
The thermistor device comprises the same thermistor element 11 and tubular case 22 as in the first embodiment.

The cylindrical case 22 has a cylindrical shape, and the terminal portions 22a and 22b of which the central portions of the opposing bottom surfaces are made of metal.
And a tubular elastic body 22c made of an insulating and elastic resin, for example, a silicone resin or the like, by a tubular connecting body 22d, 22e made of an insulating resin and having a substantially L-shaped cross section. Connected together to form a sealed internal space.

In the thermistor device having the above structure, the thermistor element 11 is housed in the inner space of the cylindrical case 22, and the electrodes 11a, 11 of the thermistor element 11 are accommodated.
b is opposed to the terminal plates 22a and 22b arranged on the opposite bottom surfaces of the cylindrical case 22.

Such a thermistor device is, for example, a resin molding die in which a terminal plate 22a, a thermistor element 11 and a terminal plate 22b are sequentially stacked and a cylindrical elastic body 22c formed in advance on the outer peripheral portion of the thermistor element 11 is mounted. It is obtained by loading the inside and molding the tubular connecting bodies 22d and 22e with resin. Therefore, the thermistor element 1
1 and electrodes 11a and 11b and terminal plates 22a and 2
The surface facing 2b is hermetically housed inside the cylindrical case 22.

When the thermistor device is used, the terminal plates 22a and 22b are pressed toward the inside of the cylindrical case 22 by the clip terminals (not shown) as in the first embodiment shown in FIG. Will be done. Therefore, even if the gap K is formed between the electrodes 11a and 11b of the thermistor element 11 and the terminal plates 22a and 22b,
The tubular elastic body 22c is compressed and deformed, and the one terminal plate 22a
Is in electrical contact with one electrode 11a of the thermistor element 11, and the other terminal plate 22b is in electrical contact with the other electrode 11b of the thermistor element 11.
2a and 22b function as external lead-out terminals of the thermistor device.

[Third Embodiment] As shown in FIG. 6, the thermistor device has the same thermistor element 1 as that of the first embodiment.
1 and a tubular case 32.

The tubular case 32 has terminal plates 32a and 32b whose central portions on opposite bottom surfaces are made of metal, and the terminal plate 3
The annular bodies 32c and 32d extending from the peripheral portions of the 2a and 32b and having a substantially L-shaped cross section and made of an insulating resin or the like are formed in a cap shape, for example, a polyimide film or the like coated with an adhesive on one surface. By the tubular foil-like body 32e made of the insulating film, the annular bodies 32c and 32d are integrally connected with each other at a predetermined interval, and are configured into a cylindrical shape having a sealed internal space.

In the thermistor device having the above structure, the thermistor element 11 is housed in the internal space of the cylindrical case 32, and the electrodes 11a, 11 of the thermistor element 11 are accommodated.
b is opposed to the terminal plates 32a and 32b arranged on the opposed bottom surfaces of the cylindrical case 32.

In such a thermistor device, for example, the terminal plates 32a and 32b are loaded in a resin molding die, and the annular body 3 is formed.
The thermistor element 11 is arranged between the cap-shaped molded bodies 33 and 34 obtained by resin molding 2c and 32d, respectively, and the tubular foil-shaped body 32e is replaced with the annular bodies 32c and 3.
By being attached to the cylindrical outer peripheral portion of 2d, they are integrally connected and obtained. Therefore, the thermistor element 11, the electrodes 11a and 11b, and the facing surfaces of the terminal plates 32a and 32b are hermetically housed inside the cylindrical case 32.

When the thermistor device is used, the terminal plates 32a and 32b are pressed toward the inside of the cylindrical case 32 by the clip terminals (not shown) in the same manner as the first embodiment shown in FIG. Will be done. Therefore, even if the gap K is formed between the electrodes 11a and 11b of the thermistor element 11 and the terminal plates 32a and 32b,
The tubular foil 32e is compressed and deformed, and the one terminal plate 32a
Electrically contacts one electrode 11a of the thermistor element 11, and the other terminal plate 32b electrically contacts the other electrode 11b of the thermistor element 11.
2a and 32b function as external lead-out terminals of the thermistor device.

[Fourth Embodiment] As shown in FIG. 7, the thermistor device has the same thermistor element 1 as that of the first embodiment.
1 and a tubular case 42.

The cylindrical case 42 has terminal faces 42a and 42b made of metal, which are formed in a cap shape by bending opposing bottom surfaces and their peripheral portions at a substantially right angle. For example, one surface of the terminal plates 42a and 42b is coated with an adhesive material. With the tubular foil-like body 42c made of an insulating film such as a film, the terminal board 42
a and 42b are integrally connected to each other at a predetermined interval to form a cylindrical shape having a sealed internal space.

In the thermistor device having the above structure, the thermistor element 1 is placed in the sealed internal space of the cylindrical case 42.
1 is housed and the electrode 1 of the thermistor element 11
1a and 11b are opposed to the terminal plates 42a and 42b which form the opposing bottom surfaces of the cylindrical case 42.

In such a thermistor device, for example, the thermistor element 11 is provided between the cap-shaped terminal plates 42a and 42b.
The tubular foil 42c is arranged and the terminal plates 42a, 42b are placed.
It is obtained by being attached integrally by being attached to the cylindrical outer peripheral portion of. Therefore, the thermistor element 11, the surfaces of the electrodes 11a and 11b facing the terminal plates 42a and 42b are hermetically housed in the cylindrical case 42.

When the thermistor device is used, the terminal plates 42a and 42b are pressed toward the inside of the tubular case 42 by the clip terminals (not shown), as in the first embodiment shown in FIG. Will be done. Therefore, even if the gap K is formed between the electrodes 11a and 11b of the thermistor element 11 and the terminal plates 42a and 42b,
The tubular foil 42c is compressed and deformed, and the one terminal plate 42a
Electrically contacts one electrode 11a of the thermistor element 11, and the other terminal plate 42b electrically contacts the other electrode 11b of the thermistor element 11.
2a and 42b function as external lead-out terminals of the thermistor device.

[Other Embodiments] The thermistor device according to the present invention is not limited to the above-mentioned embodiment, but can be variously modified within the scope of the invention.

For example, in the above-mentioned embodiment, the thermistor element,
Although the shape of each member such as the terminal plate and the tubular case has been described as being circular, it may be rectangular or the like.

Further, the terminal boards 12a, 12b, 22a, 2
2b, 32a, 32b, 42a, and 42b have been described with the contact surfaces with the electrodes 11a and 11b of the thermistor element 11 being flat, but the conductivity with the electrodes 11a and 11b of the thermistor element 11 is more reliable. In order to make the terminal board 12a, 12b, 22a, 22b, 32a, 32
It is preferable that b, 42a, and 42b have a spring property and are formed in a bowl shape, or that a protrusion is formed facing the electrodes 11a and 11b.

[0032]

As described above, the thermistor device according to the present invention has the following effects. [Claim 1] Since the terminal plate itself, which is in electrical contact with the thermistor element, functions as a part of the tubular case, the thermistor element can be housed inside the sealed tubular case. Therefore, the contact portion between the electrode portion of the thermistor element and the terminal plate can be shielded from the reducing gas or the atmosphere of high humidity, and a thermistor device having highly reliable electric characteristics can be obtained.

[Claim 2] When the terminal plate of the tubular case is pressed inward, the tubular case is elastically deformed and the thermistor element and the terminal plate come into contact with each other. The electrodes of the thermistor element can be electrically led out to the outside through the terminal plate in the state of being housed in the case.

[Claim 3] When the terminal plate of the tubular case is pressed inward, the tubular case is deformed and the thermistor element and the terminal plate come into contact with each other, so that the thermistor element is sealed in the tubular case. The electrodes of the thermistor element can be electrically led out to the outside through the terminal plate in the state of being housed inside.

[Brief description of drawings]

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

2 is a cross-sectional side view of the thermistor device of FIG.

3 is a cross-sectional side view showing a state in which the thermistor device of FIG. 2 is used.

FIG. 4 is a perspective view of a second embodiment of the thermistor device according to the present invention.

5 is a cross-sectional side view of the thermistor device of FIG.

FIG. 6 is a perspective view of a thermistor device according to a third embodiment of the present invention.

FIG. 7 is a perspective view of a fourth embodiment of the thermistor device according to the present invention.

FIG. 8 is a conventional cross-sectional view.

[Explanation of symbols]

 11 Thermistor element 11a, 11b Electrode 12 Cylindrical case 12a, 12b Terminal plate 12c Cylindrical elastic body 22 Cylindrical case 22a, 22b Terminal plate 22c Cylindrical elastic body 32 Cylindrical case 32a, 32b Terminal plate 32e Cylindrical foil body 42 tubular case 42a, 42b terminal plate 42c tubular foil

Claims (3)

[Claims] 1. A tubular case and a plate-like thermistor element having electrodes formed on both main surfaces thereof. The tubular case is arranged such that terminal plates are insulated from each other on at least a part of opposing bottom surfaces. The thermistor element is housed inside the tubular case, and the electrode of the thermistor element faces the terminal plate of the tubular case. 2. The thermistor device according to claim 1, wherein at least a part of the cylindrical case is made of an elastic body. 3. The thermistor device according to claim 1, wherein at least a part of the tubular portion of the tubular case is made of a foil-shaped body.