JPH085468A - Thermistor sensor - Google Patents

Abstract

PURPOSE:To hinder the generation of short circuit between lead wires of a thermistor element without using a spacer. CONSTITUTION:One end of an insulating coating wire 1, with which a pair of core wires 2, 2 are coated, is cut so that the central part is formed into the peak and that the insulating coating 3, which includes the core wires 2, 2, is cut in the oblique directions so as to be inclined downward at the opposite ends, and the core wires 2 are respectively exposed in the two cut surfaces, and a standing part 4 is formed between the core wires 2, 2. The core wires 2, 2 are separated by the standing part 4 so as to hinder the contact of the lead wires 6, 6 of a thermistor element 5, which are fitted to the core wires 2, 2 so as to ride over the standing part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermistor sensor used for temperature sensors and the like, and more particularly to a lead wire mounting structure for a thermistor element.

[0002]

2. Description of the Related Art Conventionally, in this type of thermistor sensor, as shown in FIG. 5, each lead wire 22 of a thermistor element 21 is soldered to a pair of core wires 24 exposed on an end surface of an insulating coated wire 23. After that, the thermistor element 21 including this is incorporated in a case or a part of the insulating coating 25 of the insulating coated wire 23 is coated with an insulator 26 such as glass, resin or the like.

Recently, products incorporating a thermistor sensor are
In response to strong demands for functional improvement, weight reduction, miniaturization and cost reduction, not only miniaturization of the thermistor element itself but also thin insulating coated electric wires have been used for wiring of the thermistor element.

[0004]

As the thermistor element is miniaturized and the insulation-coated electric wire is made thinner, the lead wires of the thermistor element become extremely close to each other, and as shown in FIG. When the twisted wires of the respective core wires 24 of 23 are untwisted and come into contact with each other, or when the preliminary solder is applied to the respective core wires, the preliminary solder 27 applied to one core wire 24 as shown in FIG. There is a new problem in that it may come into contact with 24, which causes a defect such as insulation failure or short circuit of the thermistor sensor.

In order to solve such a problem, as shown in FIG. 8, an insulating spacer 28 is interposed between the lead wires 22, 22 to separate the core wires 24, 24 and the lead wires 22, 22 from each other. Although attempts have been made to prevent short-circuiting between them and the occurrence of insulation failure, a spacer 28 is provided between a pair of lead wires 22 and a core wire 24 connected to a fine thermistor element 21 to connect wires, mold, and coat. If it is carried out, it is bulky and requires precise work for assembling, which increases the number of assembling steps, which is a major obstacle to downsizing and cost reduction.

An object of the present invention is to provide a thermistor sensor which can reliably separate the lead wires of the thermistor element and the core wires of the insulation coating wire connecting the lead wires without using a spacer.

[0007]

In order to achieve the above object, in a thermistor sensor according to the present invention, a part of a pair of core wires of an insulation-coated electric wire is exposed from the insulation coating, and a lead wire attached to the thermistor element is provided. In the thermistor sensor, each of which is connected to an exposed portion of the core wire by soldering, the pair of core wires exposed from the insulating coating are separated from each other by a part of the insulating coating.

Further, the edge of the insulating coating exposing each core wire has a rising portion rising in the direction of the exposed core wire, and the rising portion is a portion formed between both core wires and separating both core wires. The length of the core wire portion exposed from the insulating coating is not more than the rising height of the rising portion.

Further, the insulating coating has a cutting surface for exposing the core wire, the cutting surface of the insulating coating is composed of two inclined surfaces forming an angle with each other, and the rising portion is formed between both inclined surfaces. Is.

Further, the end surface of the core wire exposed from the insulating coating forms an inclined surface parallel to the cut surface of the insulating coating.

Further, the insulating coating has a cut surface for exposing the core wire, and the cut surface of the insulating coating has two kinds of cut surfaces, a common cut surface for both core wires and an individual cut surface for each core wire. Have,
The cutting positions of the two cutting surfaces are different in the length direction of the insulating coated wire, and the cutting surface common to both the core wires is the surface of the insulating coating left between the two core wires and separating the both core wires. The cut surface that forms the rising portion and is individual to each core wire exposes each core wire individually from the insulating coating.

[0012]

The rising portion of the insulating coating is a barrier between the core wires exposed from the insulating coating. Even if the core wire is loosely twisted or the pre-solder applied to the core wire drips, neither is blocked by the rising portion and the core wires are not short-circuited. The thermistor element straddles the rising portion, and its lead wire is soldered to each core wire at a height equal to or lower than the height of the rising portion.

The rising portion of the insulating coating can be formed by simply cutting the end portion of the insulating coating in an oblique direction when exposing a part of the core wire from the insulating coating. Obtained on the upper cut surface when cut into pieces.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the present invention exposes a part of a pair of core wires 2 and 2 of an insulating coated wire 1 to an end surface of the insulating coating 3 and a part of the insulating coating 3 between both core wires 2 and 2 to a rising portion 4. , And both core wires 2 and 2 are separated by the rising portion 4,
Both the lead wires 6 and 6 of the thermistor element 5 installed across the rising portion 4 are soldered and connected to the core wires 2 and 2, respectively.

In the example of FIG. 1, the insulating coating 3 is simply cut diagonally including the core wires 2 and 2 in two directions inclined downward from the center of the insulating coated wire 1 to the opposite side edges. When the insulated coated wires 1 having a plurality of wires and a plurality of angles form an angle with each other and are obliquely cut from two directions, the cut surface 7 is directed toward the side with the center of the end portion of the insulated covered wire 1 being a sharp end as shown in FIG. The end surface of the core wire 2 appears in an elliptical shape on the cut surface 7 of the inclined surface of an ellipse that is inclined downward. The core wire 2, which appears on each cut surface 7,
Between the two, a part of the insulating coating that rises toward the tip is left, and this becomes the rising portion 4, and the rising portion 4 separates the two core wires 2 and 2. The core wire 2, which appears on each cut surface 7,
2 is pre-soldered, and both lead wires 6 and 6 of the thermistor element 5 are soldered to the core wires 2 and 2 to complete the thermistor sensor 8 of FIG. According to the present embodiment, the exposed portion of the core wire 2 appears in an elliptical shape, so that the joint area between the core wire 2 and the lead wire 6 increases.

A pair of lead wires 6 and 6 of the thermistor element 5.
Are separately connected to the core wires 2 and 2 at the rising portion 4, but at this time, since the lead wires 6 and 6 are slightly widened, the lead wires do not come into contact with each other. Moreover, since the core wires 2 and 2 are completely separated by the rising portion 4, the core wires 2 and 2 do not come into contact with each other, and a short circuit or a defective insulation does not occur.

Further, when the thermistor element 5 including a part of the insulation coating 3 is coated or molded and embedded in the insulation 9, the amount of the insulation 9 protruding from the insulation coating 3 in the circumferential direction is small. Therefore, miniaturization of the thermistor sensor 8 can be realized.

FIG. 3 shows an example in which the core wire 2 is raised from the cut surface 7 of the insulating coating 3 at a constant height. As in the case of FIG. 1, the insulating coating 3 is cut diagonally from two directions in a direction inclining to the side, with the center of the end surface of the insulating coated wire 1 as a sharp end, but the pair of core wires 2 and 2 are insulated. It rises on the cut surface 7 of the coating 3.

The rising height of the core wire 2 is preferably within the range of the height of the rising portion 4. As long as the rising height of the core wire 2 is within the height range of the rising portion 4, the pair of core wires 2 and 2 will not contact each other even if the core wires 2 and 2 swing or bend. The thermistor element 5 is supported by the lead wires 6 and 6 across the rising portion 4 of the insulating coating 3, and the lead wires 6 and 6 are soldered and connected to the core wires 2 and 2.

FIG. 4 is a modification of FIG. The cut surface 7 of the insulating coating 3 is an inclined surface in FIG. 3, but is cut stepwise in FIG. The step-like shape means that there are two or more cut surfaces having different heights and different heights, and since it has a step in an oblique direction, the step-like cut surface is one aspect of the inclined cut surface. I can say. The upper cut surface of the stairs is the common cut surface 10 for both core wires, and the lower cut surface is the separate cut surface 11 for each core wire.

The cut surface 10 common to both the core wires 2 and 2 has a rising portion 4 where a part of the insulating coating 3 is left between the core wires 2 and 2.
The cut surface 11 for each core wire is a surface for exposing the core wires 2, 2 from the insulating coating 3. Each of the core wires 2 and 2 has an individual cutting surface 11 to a common cutting surface 10.
It rises and is exposed within the range of up to. Each core wire 2, 2
The procedure for attaching the lead wires 6 and 6 of the thermistor element 5 to the exposed portion by means of soldering connection is exactly the same as in the previous embodiment.

According to this embodiment, the core wires 2 and 2 are held in place by being supported by a part of the insulating coating 3 left as the rising portion 4 between the core wires 2 and 2 and separated from each other. It
In this embodiment, the exposed portions of the core wires 2 and 2 which are raised above the insulating coating 3 have the common cut surface 10 at the insulating coating 3
Cut at the same height as, or insulation coating 3
Separately from the cutting position of (1), the bonding area of the lead wire may be enlarged by cutting in an oblique direction as in the case of FIG.

[0023]

As described above, according to the present invention, a pair of core wires are separated from each other by effectively utilizing a part of the insulating coating for covering the core wires. By separating the core wires, it is possible to prevent accidents such as short circuit of the thermistor element and insulation failure.

In particular, the present invention can separate the two core wires from each other only by stripping the insulation coating of the core wire, and can be applied without problems even if the thermistor element is fine or the insulation coating wire is a fine wire. The thermistor sensor can be easily downsized and the cost can be easily reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a perspective view of an insulating coated wire used in the first embodiment.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a third embodiment of the present invention.

FIG. 5 is a diagram showing an example of a conventional thermistor sensor.

FIG. 6 is a diagram showing a problem of a conventional thermistor sensor.

FIG. 7 is a diagram showing another problem of the conventional thermistor sensor.

FIG. 8 is a diagram showing an example of solving the problem of the conventional thermistor sensor.

[Explanation of symbols]

 1 Insulated wire 2 Core wire 3 Insulation 4 Rising part 5 Thermistor element 6 Lead wire 7 Cut surface 8 Thermistor sensor 9 Insulator 10 Common cut surface 11 Individual cut surface

Claims (5)

[Claims] 1. A thermistor sensor, wherein a part of a pair of core wires of an insulation-coated electric wire is exposed from the insulation coating, and lead wires attached to the thermistor element are connected by soldering to the exposed parts of the core wire, respectively. A thermistor sensor, wherein the pair of core wires exposed from the coating are separated from each other by a part of the insulating coating. 2. The edge of the insulating coating exposing each core wire has a rising portion rising in the direction of the exposed core wire, and the rising portion is a portion formed between the core wires and separating both core wires. The thermistor sensor according to claim 1, wherein the length of the core wire portion exposed from the insulating coating is equal to or less than the rising height of the rising portion. 3. The insulating coating has a cutting surface for exposing the core wire, the cutting surface of the insulating coating is composed of two inclined surfaces forming an angle with each other, and the rising portion is formed between the both inclined surfaces. The thermistor sensor according to claim 2, wherein 4. The end surface of the core wire exposed from the insulating coating is
The thermistor sensor according to claim 3, wherein the thermistor sensor has an inclined surface parallel to the cut surface of the insulating coating. 5. The insulating coating has a cutting surface for exposing the core wire, and the cutting surface of the insulating coating has two kinds of cutting surfaces: a cutting surface common to both core wires and an individual cutting surface for each core wire. The cutting positions of both cutting surfaces are different in the length direction of the insulating coated wire, and the cutting surface common to both core wires is the surface of the insulating coating left between the two core wires. 4. The thermistor sensor according to claim 3, wherein a rising portion that separates the core wires is formed, and the individual cut surfaces of the core wires individually expose the core wires from the insulating coating.