KR0121885Y1 - Thermister - Google Patents

Abstract

The present invention relates to single type and dual type positive temperature characteristic thermistors used in element circuits such as color TVs and color monitors. In particular, metal materials having relatively low thermal conductivity are used as terminal plates. By forming a predetermined metal wave film on the surface of the terminal board, the heat resistance is increased, and the equilibrium current is reduced to minimize the temperature influence on the PCB and the parts to which the terminal is soldered and the peripheral parts. The present invention relates to a characteristic thermistor, in which a silver electrode film is formed at a thickness of 1 μm to 5 μm, respectively, in an electrode extraction terminal made of elastic material made of phosphor bronze, and used in a PCB having a heat resistance temperature of about 105 ° C. The insulation or strength of the PCB is increased because the heat transferred from the lead-out terminal to the soldering portion is so high that the heat resistance temperature of the PCB is exceeded. In order to solve the problem of lowering, high balance current, etc., the terminal is made of a metal material having a relatively low thermal conductivity, and a predetermined metal film is coated on the electrode drawing terminal surface to increase the heat resistance and It is characterized by the fact that it is a constant temperature characteristic thermistor which improves the reliability by reducing the temperature inside the peripheral parts and the device and reduces the balance current.

Description

Terminal of Constant Temperature Thermistor

1 is a cross-sectional view of the applied single type thermistor of the present invention,

2 is a cross-sectional view of the dual type thermistor to which the present invention is applied.

3 is a cross-sectional view taken along the line A-A in the present invention shown in FIG.

* Explanation of symbols for main parts of the drawings

1: insulation case 2: lid

3: Thermistor element 4: Terminal for electrode extraction

6: PCB 10: Thermistor

41: silver electrode film 42: film treatment part

43: soldering part

The present invention relates to a single type or dual type constant temperature characteristic thermistor for which a color TV or a color monitor is used in an element circuit.

In particular, by using a metal material having a relatively low thermal conductivity as a terminal plate, a predetermined metal film is formed on the surface of the terminal plate to increase the heat resistance and reduce the equilibrium current, thereby soldering the printed circuit board (hereinafter referred to as PCB) and the terminal. And a terminal of a constant temperature characteristic thermistor for minimizing temperature influence on surrounding parts and improving solderability during assembly.

In general, in a degaussing circuit of an image display tube such as a color TV or a color monitor, a thermistor element having a constant temperature coefficient of resistance, an elastic terminal for electrically and mechanically coupling the element, and an insulated case supporting them A constant temperature thermistor consisting of

When power is applied to the normal temperature characteristic thermistor, the holding current flows, and the thermistor element generates heat. At this time, when the heat dissipation is performed through the electrode drawing terminal, the element heats up and the equilibrium current can be increased. It is desirable to have a property that must prevent the increase of current. In this thermistor, the terminal is composed of a metal elastic body supporting the device as well as connecting a power supply to the device, and it is desirable to have high conductivity and low thermal conductivity, but when the thermal conductivity is low, Contradictions arise that are not easy to manufacture and solder.

Known techniques in this field include Japanese Utility Models Nos. 58-49601 and 59-15171, and the like. The conventional positive temperature characteristic thermistors are single type or dual type and the thermistors have a rectangular or circular plate shape. A silver electrode film is formed at a thickness of 1 μm to 5 μm in each of the electrode extracting terminals made of a material having elasticity as a thermistor element and phosphor bronze, and the electrical contact and mechanical contact by elasticity are made between the thermistor element and the electrode extracting terminal. The end of the electrode lead-out terminal is attached to the PCB by soldering.

According to the prior art as described above, when used in a PCB having a heat resistance temperature of about 105 ° C., the heat transfer from the electrode drawing terminal to the soldering part is high, so that the heat resistance temperature of the PCB is exceeded. There is a problem that the strength is lowered.

On the contrary, when the terminal uses a metal material having a relatively low thermal conductivity compared to the terminal of the phosphor bronze material, the metal having low thermal conductivity is not soldered by a general general solder (Pb: Sn = 60: 40 ratio) when assembling the PCB. In the case of using the material, a special soldering process was first performed, and then a work process such as soldering with general solder was complicated, and thus it was impossible to use industrially.

In addition, with the recent improvement of the technology, the reduction of the constant temperature characteristic thermistor element has been realized, and the trend of the enlargement of color TVs or color monitors has required thermistors that can accommodate the large value of the device current. When current flows into the device circuit, the heat generated during the operation of the positive temperature characteristic thermistor element is also increased, which increases the heat transferred to the soldering part of the PCB and increases the surface temperature of the positive temperature characteristic thermistor case, the surrounding components, and the temperature inside the device. This implies various problems such as lowering reliability.

As described above, the object of the present invention devised to solve all the problems of the prior art is to form a predetermined metal film on the surface of the terminal plate by using a metal material having a relatively low thermal conductivity as the electrode drawing terminal plate as described above. The present invention provides a terminal of a constant temperature characteristic thermistor which increases heat resistance and reduces parallel current, and improves reliability by lowering the temperature inside the PCB and surrounding components.

With reference to the accompanying drawings, the technical configuration of the present invention to achieve the above object will be described.

As shown in FIG. 1, FIG. 2, and FIG. 3, the electrode withdrawal for narrowing and fixing the thermistor element 3 is provided against the insulating case 1, the lid 2, and the inner circumferential surface of the case 1; In the positive temperature characteristic thermistor 10 consisting of the terminals 4, the electrode withdrawal of which the thermal conductivity is small from 0.02 to 0.09 (cal / Cm.sec. ° C.) and the thin elastically punched metal material is 0.05 to 0.3 mm Nickel (Ni) and tin (Sn) on the surface of the terminal 4 is formed as a coating portion 42 having a thickness of about 0.5 to 10μm, the coating portion 42 is the electrode lead terminal 4 The entire or a portion exposed out of the insulating case 1 is formed by coating with nickel (Ni) and tin (Sn).

It will be described in more detail the effect of the present invention made as described above.

The temperature rise of the terminal 4 is suppressed by coating the electrode extraction terminal 4 with a thickness of about 0.5 to 10 μm on the terminal 4 of the positive temperature characteristic thermistor element 3. The heat resistance strength and the temperature of the surface of the case 1 are reduced, and the temperature inside the peripheral parts and the device is reduced when mounted on the PCB 6.

In addition, the dual type positive temperature characteristic thermistor element 3 can reduce the heat loss of the thermal coupling, can stably reduce the balanced current, and reduce the amount of heat transferred to the PCB 6 having heat resistance of about 105 ° C. By doing so, the reliability of the substrate 6 can be ensured.

In addition, the terminal 4 is coated with nickel and tin on the part exposed outside the insulating case 1, so that the solder can be soldered with ordinary solder while using a metal material having low thermal conductivity.

With reference to Table 1 of the positive temperature characteristic thermistor 3 made as described above, the remarkable effects of the present invention will become even more apparent.

Here, the terminal I group of the present invention is an experimental example when the thermal conductivity is achieved by using stainless steel among the soluble metal materials corresponding to 0.02 to 0.09 (Cal.Cm.Sec. ° C).

However, the material of the stainless steel is difficult to general soldering process to be treated by special soldering, but the special soldering is expensive, the situation is not available industrially.

Therefore, the coating of nickel (Ni) on the surface of the stainless steel is then made by coating the tin (Sn) thereon.

In addition, the terminal II group is the result confirmed by using the nickel silver within the said heat conductivity range, and the conventional terminal is based on using phosphor bronze.

Referring to the above experimental example, when a metal material having a relatively low thermal conductivity is used as the electrode withdrawing terminal, the heat loss of the positive temperature characteristic thermistor element 3 is reduced, so that an increase in the equilibrium current can be prevented and the PCB 6 can be prevented. It is confirmed that the heat of the soldered parts can be reduced by about 20% for the single type and about 49 to 55% for the dual type. Has an enhanced effect to be realized.

As described above, even though a low thermal conductivity metal material is used for the terminal 4 of the positive temperature characteristic thermistor, soldering can be performed at a time with ordinary solder, thereby greatly improving workability, and forming a metal film on the electrode withdrawing terminal. Increasing the heat resistance and reducing the equilibrium current is a very useful design that has the reliability to lower the temperature inside the PCB (6) and surrounding components and devices.

Lastly, in the case of constructing a constant temperature characteristic thermistor for the conventional motor starting, overcurrent protection, etc., it is also found that this also belongs to the technical category of the present invention when implementing a terminal having the same technical idea as the present invention.

Claims (1)

In the positive temperature characteristic thermistor 10, which is provided against the case 1, the lid 2, and the inner peripheral surface of the case 1, and is formed with an electrode extraction terminal 4 for narrowing and fixing the thermistor element 3, Nickel and tin on the surface of the electrode withdrawing terminal 4 having a small thermal conductivity of 0.02 to 0.09 (cal.Cm.sec. ° C.) and a thin punched elastic material of 0.05 to 0.3 mm are approximately 0.5 to 10 μm thick. It is formed as a film treatment section 42, the film treatment section 42 is nickel (Ni) and tin (Sn) to the entire portion of the electrode lead-out terminal 4 or the portion exposed out of the insulating case (1) A terminal of a positive temperature characteristic thermistor, which is formed by coating.