JP2000138101A - Electronic parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict infiltration of moisture from outside into a component body by a method wherein the component body is electrically connected to a lead wire insulation-coated, and one end of parts and the lead wire is coated, and the lead wire is bent together with an insulation-coated body of the lead wire inside a protection resin. SOLUTION: Electronic parts are temperature sensors using a thermistor element 1 in an electronic parts body and constituted by the thermistor element 1, a lead wire 12, and a protection resin 13. An electrode is formed on both end faces of the thermistor element 1, and the electrode on both end faces of the thermistor element 1 is electrically connected to one end of the lead wire 12 by soldering, etc. The lead wire 12 is constituted by a conductor part 12a and an insulation-coated body 12b, and the conductor part 12a is coated with the insulation-coated body 12b excluding one end connected to the thermistor element 1. The lead wire 12 is bent in a substantially S shape in a specified length from one end connected to the thermistor element 1, and the vicinity containing a bent part of the thermistor element 1 and the lead wire 12 is coated with the protection resin 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component in which a lead wire is connected to an electronic component body, and more particularly to a temperature sensor in which the lead wire is insulated and covered with a protective resin together with the electronic component body.

[0002]

2. Description of the Related Art An example of a conventional temperature sensor using a thermistor element in the body of an electronic component of this type is described below.
A description will be given based on FIG. The temperature sensor includes a thermistor element 1, lead wires 2 and 2, and a protective resin 3. Electrodes (not shown) are formed on both end faces of the thermistor element 1, and one ends of the lead wires 2 are electrically connected to electrodes on both end faces of the thermistor element 1 by soldering or the like. The lead wire 2 is composed of a conductor 2a and an insulating cover 2b. The conductor 2a is covered with an insulating cover 2b except for one end connected to the thermistor element 1. Protective resin 3
Is an epoxy resin, which covers the thermistor element 1 and one end of the lead wire 2 connected to the thermistor element 1 side.

[0003]

However, in the temperature sensor having the above-mentioned structure, while the temperature sensor is used in an environment such as high humidity, water penetrates into the protective resin 3 and reaches the thermistor element 1. There is a problem that insulation failure and migration occur.

[0004] The locations where moisture easily penetrates are the interface 4 between the lead wires 2 and 2 and the protective resin 3 and the contact surface 5 between the lead wires 2 and 2 shown in FIG. When the leads 2 are covered with the protective resin 3, if the two leads 2 are in close contact with each other, the protective resin 3 does not go around the contact surface 5 of the leads 2. In such a state, as shown in FIG. 3, when the lead wires 2 are separated in the opposite directions X1 and X2, the gap of the contact surface 5 not covered with the protective resin 3 is widened, and moisture is removed. It penetrates from the contact surface 5.

Further, the protective resin 3 and the lead wires 2 are physically in contact with each other and are not chemically bonded. For this reason, after the protective resin 3 is cured, a minute gap is generated at the interface 4 between the lead wires 2 and 2 and the protective resin 3, which causes moisture to enter.

An object of the present invention is to solve the above problems and to provide an inexpensive, highly waterproof and long-life electronic component.

[0007]

In order to achieve the above object, in an electronic component according to the present invention, a lead wire coated with insulation on an electronic component body is electrically connected to the electronic component body and the lead wire. Is covered with a protective resin, and the lead wire is bent inside the protective resin together with the insulating covering of the lead wire. It is preferable that the lead wires are separated from each other at a portion led out from the inside of the protective resin.

[0008] In this way, it is possible to suppress the penetration of moisture from the outside into the electronic component body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described in detail with reference to FIG. The electronic component shown in FIG. 1 is a temperature sensor using a thermistor element 1 in an electronic component body, and includes a thermistor element 1 and a lead wire 1.
2 and 12 and a protective resin 13. Electrodes (not shown) are formed on both end faces of the thermistor element 1, and one ends of the lead wires 12 are electrically connected to electrodes on both end faces of the thermistor element 1 by soldering or the like. Lead wire 12
Is composed of a conductive wire portion 12a and an insulating cover 12b,
Except for one end connected to the thermistor element 1, the conductor 12a is covered with an insulating covering 12b. Further, the lead wires 12, 12 are bent in a substantially S-shape for a predetermined length from one end connected to the thermistor element 1, and the vicinity including the bent portions of the thermistor element 1 and the lead wires 12, 12 is formed of a protective resin. 13. Here, the portions where the lead wires 12, 12 covered with the protective resin 13 are led out from the inside of the protective resin 13 are separated so that the lead wires 12, 12 do not contact each other.

In this manner, the lead wire 12 is bent in a substantially S-shape to make the length of the lead wire 12 covered with the protective resin 13 longer than in the prior art.
4 and reaches the thermistor element 1, and moisture penetrates into the protective resin 13 through the inside of the lead wire 12, that is, between the conductor 12 a and the insulating coating 12 b and reaches the thermistor element 1. Can be suppressed.

Further, since the lead wires 12 extending from the inside of the protective resin 13 to the outside are separated from each other so as not to contact with each other, the protective resin 13 is
And the lead wires 12 and 12 are separated from each other in the opposite direction even if the lead wires 1 and 12 are separated from each other.
Infiltration of moisture from the contact surfaces 2 and 12 can be suppressed.

The protective resin 13 can be made of any of epoxy, polyethylene, Teflon, and (registered trademark) silicon-based materials. Further, as the insulating coating 12b of the lead wire 12, usually, vinyl chloride,
In some cases, a material such as polyethylene, Teflon, or silicon is used. In this case, it is more preferable that the protective resin 13 be made of the same material as the insulating coating 12b in order to increase the degree of bonding.

In the present embodiment, the electronic component body uses a thermistor element. However, the thermistor element may be either a negative or positive characteristic thermistor. It is also possible to change to

[0014]

As described above, the electronic component according to the present invention is
A lead portion of a lead wire that is insulated and coated on the electronic component body is electrically connected, one end of the electronic component body and one end of the lead wire are covered with a protective resin, and a bent portion of the lead wire inside the protective resin. The bent portion has a function of increasing the distance from the electronic component main body to the lead-out portion of the lead wire to suppress the entry of moisture from the interface, so that the same protective resin or lead wire as the conventional product is provided. It is possible to more effectively suppress the intrusion of water while using the water. Further, since the lead wires are separated from each other at a portion led out from the inside of the protective resin, it is possible to suppress moisture from entering between the two lead wires.

[Brief description of the drawings]

FIG. 1 shows a temperature sensor as one embodiment according to the present invention, wherein (a) is a cross-sectional view and (b) is a side view.

FIG. 2 shows a conventional temperature sensor, (a) is a sectional view,
(B) is a side view.

FIG. 3 is a diagram of the temperature sensor of FIG. 2 in which two lead wires are separated in opposite directions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermistor element 12 Lead wire 12a Conductor part 12b Insulation coating 13 Protective resin 14 Interface

Claims (3)

[Claims] 1. A lead portion of a lead wire, which is insulated and coated on an electronic component main body, is electrically connected to the electronic component main body and one end of the lead wire is covered with a protective resin. An electronic component having a bent portion of a lead wire, wherein the bent portion has a function of increasing a distance from the electronic component main body to a lead-out portion of the lead wire to suppress intrusion of moisture from an interface. . 2. The electronic component according to claim 1, wherein portions of the lead wire led out of the protective resin are separated from each other. 3. The electronic component according to claim 1, wherein the electronic component body is a negative temperature coefficient thermistor.