JP2582422Y2 - Positive characteristic thermistor device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive temperature coefficient thermistor device, and more particularly, to a case where a terminal fitting is inserted into a substrate for use. In. Type positive temperature coefficient thermistor.

[0002]

2. Description of the Related Art A typical application example of a positive temperature coefficient thermistor device of this type is a shadow receiver of a television receiver. This is a degaussing apparatus used for mask degaussing. Examples of known documents include Japanese Utility Model Laid-Open No. 1-150202, Japanese Utility Model Laid-Open No. 2-57685, and Japanese Utility Model Laid-Open No. 3-110801. The positive temperature coefficient thermistor device described in these known documents arranges the positive temperature coefficient thermistor in the internal space of the outer case and draws out a terminal fitting electrically connected to the electrode of the positive temperature coefficient thermistor from the bottom of the outer case to the outside. It has a structure. The terminal fitting has a wide portion that appears on the outside and a narrow portion connected to the end thereof, and the narrow portion is inserted into a hole provided in the circuit board and soldered. There is a step between the wide part and the narrow part, and the edge of the step is placed in contact with the circuit board surface.

[0003] Further, as disclosed in the above-mentioned known literature, a projection for reinforcing the terminal fitting and ensuring the stability of support may be provided on the bottom of the outer case in some cases. The tip of the projection and the step are set at substantially the same position, and the edge of the step of the terminal fitting and the tip of the projection are placed against the circuit board surface.

[0004] This type of positive temperature coefficient thermistor device utilizes a current limiting function associated with the heat generation operation of the positive temperature coefficient thermistor, and conducts heat from the positive temperature coefficient thermistor to terminal fittings.
Heat conduction from the terminal fittings to the circuit board, and thereby heating of the circuit board, is inevitable and cannot be avoided. Then, by the heat conducted from the positive temperature coefficient thermistor device,
As a means for preventing the circuit board from discoloring or burning, a connection fitting such as an eyelet is attached to the hole for inserting the terminal fitting, and the terminal fitting is soldered onto the circuit board via the connection fitting. Attach.

[0005]

As described above, in the conventional positive temperature coefficient thermistor device, the terminal fitting has a wide portion having a portion which appears to the outside and a narrow portion connected to the end thereof.
Since the edge of the step between the wide portion and the narrow portion is set in contact with the surface of the circuit board, the terminal fitting is soldered onto the circuit board via a connection fitting such as an eyelet. In this case, the edge of the step portion between the wide portion and the narrow portion is attached so as to ride on the tip of a connection fitting such as an eyelet. For this reason, a gap is generated between the bottom of the outer case and the circuit board, the stability of the PTC thermistor device on the circuit board is deteriorated, the terminal fitting is bent, and the PTC thermistor device is incorrectly arranged. This causes problems such as so-called rattling.

[0006] Even when a projection is provided on the bottom of the outer case to reinforce the terminal fitting and ensure the stability of the support, the tip edge of the projection and the edge of the step are set at substantially the same position. Therefore, when the edge of the step portion of the terminal fitting rides on the connector, a gap is generated between the tip edge of the projection and the circuit board, causing the same problem.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems, and to stably attach the circuit board to a circuit board without being affected by a connecting tool such as an eyelet. An object of the present invention is to provide a positive temperature coefficient thermistor device.

[0008]

In order to solve the above-mentioned problems, the present invention discloses two embodiments. The PTC thermistor device according to the first invention includes an outer case, a PTC thermistor, and a terminal fitting. The outer case has an internal space. The positive temperature coefficient thermistor is disposed in the internal space. One end of the terminal fitting is electrically connected to the electrode of the positive temperature coefficient thermistor in the internal space, and the other end is led out through the bottom. The terminal fitting has a projecting piece portion appearing on the outside and a narrow portion continuous with its previously wide portion, the wide portion projects at an interval on the side of the narrow portion, the impact The tip edge of the piece
When the PTC thermistor device is mounted on a substrate,
It is a contact end that contacts the plate surface .

A PTC thermistor device according to a second aspect of the present invention includes an outer case, a PTC thermistor, and a terminal fitting. The outer case has an internal space and a projection on an outer surface of a bottom portion. The positive temperature coefficient thermistor is disposed in the internal space. The terminal fitting has one end side electrically connected to the electrode of the positive temperature coefficient thermistor in the internal space, the other end side led out to the outside through the bottom part, and a part that appears to the outside has a wide part and a step part in front thereof. And an end edge of the step portion is retracted toward the bottom from an end edge of the projection. The positive characteristic sir
When the mister device is mounted on the substrate,
Is a contact end that contacts the surface of the substrate .

[0010]

[Function] The outer case has an inner space, the positive temperature coefficient thermistor is arranged in the inner space, and the terminal fitting is
One end side is electrically connected to the electrode of the positive temperature coefficient thermistor in the internal space, the other end side is led out through the bottom of the outer case, and the part that appears to the outside has a wide part and a narrow part connected to the tip. The narrow portion can be inserted into a hole provided in the circuit board and soldered. Since the wide portion has the protruding piece protruding from the side of the narrow width section at an interval, the tip edge of the protruding piece contacts the circuit board surface, and the positive temperature coefficient thermistor device is stably supported.

The protruding pieces protrude from the side of the narrow portion at an interval.
The leading edge of this protruding piece forms the PTC thermistor device.
When it is attached to the board, it becomes the contact end that comes into contact with the board surface.The gap between the protruding piece and the narrow portion functions as an escape portion for connecting tools such as eyelets provided on the circuit board. I do.
For this reason, even when the terminal fitting is soldered on the circuit board via a connection fitting such as an eyelet, the edge of the terminal fitting does not run over the tip of the connection fitting.

In the second invention, the outer case has a projection on the outer surface of the bottom portion, and the terminal fitting has a wide portion and a narrow portion connected to the outside with a step portion at the end thereof. And
When the edge of the stepped portion has receded to the bottom side from the tip edge of the projection, and the PTC thermistor device is attached to the substrate
In this case, since the leading edge of the projection becomes a contact end that comes into contact with the surface of the substrate, the retreat of the edge of the step portion functions as an escape portion for a connector such as an eyelet provided on the circuit board. . For this reason, when a structure is adopted in which the terminal fitting is soldered on the circuit board via a connecting fitting such as an eyelet, the terminal fitting does not run on the tip of the connecting fitting.

[0013] When the second invention, the outer casing has a protrusion on the outer surface of the bottom portion, the terminal fitting is retracted to the bottom side of the front end edge of the end edge of the stepped portion is protruding, the positive characteristic Sir
When the mister device is attached to the board,
Since the contact end comes into contact with the surface of the substrate , the PTC thermistor device is stably supported.

[0014]

1 is a front partial sectional view of a PTC thermistor device according to the present invention, and FIG. 2 is a side partial sectional view of the same. In the figure, 1 is an outer case, 2 is a positive temperature coefficient thermistor, and 3 and 4 are terminal fittings. The outer case 1 is made of an electrically insulating material such as insulating plastic and has an inner space 11 inside.

The positive temperature coefficient thermistor 2 has electrodes 22 and 23 on both main surfaces of a disk-shaped or square plate-shaped body 21, and is disposed inside the internal space 11 of the outer case 1. The positive temperature coefficient thermistor 2 is positioned by the convex portion of the insulating plate 5 and is inserted into the internal space 11 in this state.

The terminal fittings 3A and 3B have one end connected to the electrodes 22 and 23 of the positive temperature coefficient thermistor 2 in the internal space 11 and the other end led out through the bottom 12 of the outer case 1. Each of the terminal fittings 3A and 3B
The portion that appears to the outside has a wide portion 32 and a narrow portion 33 connected to the wide portion 32, and the wide portion 32 has a protruding piece 34 protruding at a distance G from the side of the narrow portion 33. Terminal fitting 3
A and 3B are arranged in the space between the electrode surface of the positive temperature coefficient thermistor 2 and the inner surface of the exterior case 1 facing the electrode surface, and are applied to the electrodes 22 and 23 of the positive temperature coefficient thermistor 2 by the spring pressure of the spring portions 31 and 31. It is pressed.

As described above, the outer case 1 has the inner space 11, and the PTC thermistor 2 has the inner space 11.
One end of each of the terminal fittings 3A and 3B is electrically connected to the electrodes 22 and 23 of the positive temperature coefficient thermistor 2 in the internal space 11, and the other end is led out through the bottom 12 of the outer case 1. Since the portion that appears to the outside has the wide portion 32 and the narrow portion 33 connected to the wide portion 32, the narrow portion 33 can be inserted into a hole provided in the circuit board and soldered.

FIG. 3 is a front partial sectional view showing the mounted state of the PTC thermistor device according to the present invention, and FIG. 4 is a side partial sectional view of the same. Reference numeral 6 denotes a circuit board, and reference numerals 71 and 72 denote connectors such as eyelets. Since each of the terminal fittings 3A and 3B has a protruding piece 34 in which the wide portion 32 protrudes at a distance from the side of the narrow portion 33, the leading edge of the protruding piece 34 is
, And the positive temperature coefficient thermistor device is stably supported.

Since the protruding piece 34 protrudes from the side of the narrow portion 33 with a space therebetween, the space between the protruding piece 34 and the narrow width portion 33 causes It functions as an escape portion for a connector such as an eyelet provided on the substrate. Therefore, even when the terminal fittings 3A, 3B are soldered on the circuit board 6 via the connecting fittings 71, 72 such as eyelets, the edges of the terminal fittings 3A, 3B are connected to the connecting fittings 7 and 7.
There is no need to ride on the tip of 1,72.

In the embodiment shown in FIGS. 1 to 3, the outer case 1 has the projections 14 and 15 on the bottom portion 12, but even if the projections 14 and 15 are omitted, the projection 34 and the narrow width portion 33 are provided. The above-described operation and effect can be obtained by the interval G between. Also,
The gap G generated between the narrow portion 33 and the protruding piece 34 of the wide portion 32 can take various shapes. In the embodiment shown in FIGS. 1 to 4, the shape is square, but as shown in FIG. 5, it may be formed in an arc shape. In addition, a polygonal shape, a combination of a square shape and an arc shape, and the like can be taken.

FIG. 6 is a partial front sectional view showing the second invention.
FIG. 7 is a partial side sectional view of the same. In the figure,
1 to 4 indicate identical components. The outer case 1 has an inner space 11 and projections 14 and 15 on the outer surface of the bottom 12. Inside the outer case 1, two positive temperature coefficient thermistors 2A,
2B is provided. In the positive temperature coefficient thermistors 2A and 2B, the respective electrodes 23 are in common contact with the terminal fitting 3C and are thermally coupled to each other. The terminal fitting 3A is in contact with the electrode 21 of the PTC thermistor 2A, and the terminal fitting 3B is in contact with the electrode 21 of the PTC thermistor 3B. Terminal fitting 3A
To 3C, the other end side is led out to the outside through the bottom portion 12, and a portion that appears to the outside has a wide portion 32 and a narrow portion 33 having a step portion in front of the wide portion 32, and an end of the step portion. The edge is smaller than the tip edge of the projections 14 and 15 by the retreat amount Δh,
It retreats to the bottom 12 side.

As described above, each of the terminal fittings 3A to 3C has a wide portion 32 and a narrow portion 33 connected to the outside with a step portion at the outside, and an edge of the step portion. Is the amount of retraction Δh on the bottom 12 side of the tip edges of the projections 14 and 15.
The amount of retraction Δh of the edge of the step is
It functions as an escape portion for connecting members 71 and 72 such as eyelets provided on the circuit board 6. 3 and 4
As shown in FIG. 3, when the terminal fittings 3A to 3C are soldered onto the circuit board 6 via the connecting fittings 71 and 72 such as eyelets, the terminal fittings 3A to 3C are connected to the connecting fittings 7 and 7.
There is no need to ride on the tip of 1,72.

Moreover, the outer case 1 has projections 14 and 15 on the outer surface of the bottom portion 12, and the terminal metal fittings 3A and 3B are such that the edge of the stepped portion retreats toward the bottom 12 from the tip edge of the projections 14 and 15. Since the projections 14 and 15 are receded by the amount Δh, the leading edges of the projections 14 and 15 are received by the circuit board 6, and the positive temperature coefficient thermistor device is stably supported.

FIG. 8 is a front partial sectional view showing another embodiment of the positive temperature coefficient thermistor device according to the present invention. In this embodiment, protrusions 14 and 15 are provided on the outer surface of
Terminal fittings 3A and 3B are provided along the surfaces of 4 and 15.
In the terminal fittings 3A and 3B, the edge of the stepped portion is set back by the retreat amount Δh toward the bottom 12 side from the tip end of the projections 14 and 15, and the terminal fittings 3A and 3B are A cut-out part equivalent to the amount of retreat is installed. Therefore,
The same operation and effect as described with reference to FIGS.

[0025]

As described above, according to the present invention, the following effects can be obtained. (A) The outer case has an inner space, the PTC thermistor is disposed in the inner space, and one end of the terminal fitting is electrically connected to the electrode of the PTC thermistor in the inner space, and the other end is the outer cover. Since the part that is led out to the outside through the bottom of the case and appears outside has a wide part and a narrow part connected to the end, the narrow part is inserted into a hole provided in the circuit board and soldered. In addition, it is possible to provide a positive temperature coefficient thermistor device that can be attached and the tip edge of the protruding piece contacts the circuit board surface and can be stably supported on the circuit board. (B) Since the protruding pieces protrude from the side of the narrow width section at an interval, the gap between the protruding piece and the narrow width section is a relief portion for a connector such as an eyelet provided on the circuit board. Function as For this reason, even when the terminal fitting is soldered on the circuit board via a connection fitting such as an eyelet, the edge of the terminal fitting does not run over the tip of the connection fitting,
It is possible to provide a positive-characteristic thermistor device which has good stability and is less likely to cause bending of the terminal fitting, incorrect placement of the positive-characteristic thermistor device, and rattling. (C) In the second invention, the part that appears to the outside has a wide part and a narrow part that is continuous with a step part ahead of it, and the edge of the step part is closer to the bottom than the tip edge of the protrusion. Because you ’re retreating,
The retreat of the edge of the step portion functions as an escape portion for a connector such as an eyelet provided on the circuit board. Therefore, even when the terminal fitting is soldered on the circuit board via a connection fitting such as an eyelet, the edge of the terminal fitting does not run on the tip of the connection fitting, and the stability is good. In addition, it is possible to provide a positive-characteristic thermistor device that is unlikely to cause bending of terminal fittings, improper arrangement of the positive-characteristic thermistor device, and rattling. (D) In the case of the second invention, the outer case has a projection on the outer surface of the bottom, and the terminal fitting has a stepped portion whose edge is set back to the bottom side from the tip edge of the projection. The edge contacts the circuit board surface, and the positive temperature coefficient thermistor device is stably supported.

[Brief description of the drawings]

FIG. 1 is a front partial sectional view of a positive temperature coefficient thermistor device according to the present invention.

FIG. 2 is a partial side sectional view of the positive temperature coefficient thermistor device shown in FIG.

FIG. 3 is a front partial sectional view showing a mounting state of the PTC thermistor device shown in FIGS. 1 and 2;

FIG. 4 is a partial side sectional view showing a mounting state of the PTC thermistor device shown in FIGS. 1 and 2;

FIG. 5 is a front view showing another example of the terminal fitting used in the positive temperature coefficient thermistor device according to the present invention.

FIG. 6 is a front partial sectional view showing another embodiment of the positive temperature coefficient thermistor device according to the present invention.

FIG. 7 is a partial side sectional view of the positive temperature coefficient thermistor device shown in FIG. 6;

FIG. 8 is a front view showing still another embodiment of the positive temperature coefficient thermistor device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer case 2, 2A, 2B Positive temperature coefficient thermistor 3A, 3B, 3C Terminal fitting 32 Wide part 33 Narrow part G Interval

Continuation of the front page (56) References Japanese Utility Model Hei 1-125501 (JP, U) Japanese Utility Application Photographs of the specification and drawings attached to the application form No. 63-20999 (Japanese Utility Model Application No. 1-125501) were taken. Microfilm (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01C 7/02-7/22

Claims (2)

(57) [Scope of request for utility model registration] 1. A positive temperature coefficient thermistor device including an outer case, a positive temperature coefficient thermistor, and a terminal fitting, wherein said outer case has an internal space, and said positive temperature coefficient thermistor is inside said internal space. The terminal fitting has one end connected to the electrode of the positive temperature coefficient thermistor in the internal space, the other end led out to the outside through the bottom portion, and a portion that appears outside is a wide portion and its tip. Having a continuous narrow width portion, wherein the wide width portion has a protruding piece projecting at an interval on a side of the narrow width portion ;
The tip edge attaches the PTC thermistor device to the substrate
Then, the contact end comes into contact with the substrate surface. Positive characteristic thermistor device. 2. A PTC thermistor device including an exterior case, a PTC thermistor, and a terminal fitting, wherein the exterior case has an inner space and a projection on an outer surface of a bottom portion, The positive temperature coefficient thermistor is disposed in the internal space, and the terminal fitting has one end connected to the electrode of the positive temperature coefficient thermistor in the internal space, and the other end led out to the outside through the bottom portion, and is connected to the outside. The appearing portion has a wide portion and a narrow portion continuous with a step portion at the tip thereof, the edge of the step portion retreats to the bottom side from the tip edge of the projection, and the tip edge of the projection Is the PTC thermistor device.
A contact end that contacts the surface of the substrate when attached to the substrate
Become positive characteristic thermistor device.