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Face mounting positive temp coofficient thermister and its manufacturing method

A technology of positive temperature coefficient and thermistor, which is applied in the direction of resistors with positive temperature coefficients, resistors, resistor parts, etc., can solve the problems of high cost and low strength of the box body, and prevent displacement and position Effect of moving and improving operability

Inactive Publication Date: 2006-11-15
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in Figure 21 The surface mount type positive temperature coefficient thermistor 1 has the following problems: (1) Since the pin terminals 2a, 2b are fixed to the case bodies 3a, 3b by insert molding, the cost is high
(3) Furthermore, although the positive temperature coefficient thermistor element 5 and the pin terminals 2a, 2b are press-contacted, two boxes 3a, 3b of a fitting part and a cover part for fitting are still required.
[0009] But when Figure 22 In the surface mount type PTC thermistor, there are the following problems: (1) Since openings are provided on the three sides of the box body 12, the strength of the box body is low, and a considerable thickness is required to maintain the strength.

Method used

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  • Face mounting positive temp coofficient thermister and its manufacturing method
  • Face mounting positive temp coofficient thermister and its manufacturing method
  • Face mounting positive temp coofficient thermister and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] figure 1 It is an exploded perspective view showing a surface mount type PTC thermistor 21 according to an embodiment (Example 1) of the present invention. figure 2 It is a front view of the surface mount type PTC thermistor 21 .

[0059] The surface mount type positive temperature coefficient thermistor 21 consists of a plate-shaped positive temperature coefficient thermistor 23 formed with electrodes 22a, 22b on two opposite main surfaces; Box 24; a pair of metal terminals that are electrically connected to the two main surface electrodes 22a, 22b of the positive temperature coefficient thermistor element 23 in the inner space, and sandwich the positive temperature coefficient thermistor element 23 25a, 25b composition.

[0060] In the positive temperature coefficient thermistor element 23, electrodes 22a and 22b are formed on both main surfaces of a disc member having a diameter of 8 mm and a thickness of 2 mm.

[0061] The insulating box 24 is made of PPS (para...

Embodiment 2

[0075] image 3 It is an exploded perspective view showing a surface mount type PTC thermistor 31 of another example (Example 2) of the present invention.

[0076] Since the surface mount type positive temperature coefficient thermistor 31 is the same as the surface mount type positive temperature coefficient thermistor 21 of Embodiment 1 except for the structure of the insulating case 34, the same symbols are used for the same parts, And omit detailed description.

[0077] The insulating case 34 of the surface mount type positive temperature coefficient thermistor 31 has terminal insertion holes 27a, 37a and 27b, 37b at two positions respectively formed on a pair of end faces 34e, 34f facing each other. The terminal insertion holes 27a, 37a and 27b, 37b are in the center of a pair of main faces 34a, 34b, a pair of opening sides 34c, 34d, and a pair of end faces 34e, 34f of the insulating case 34 as the axis B-B' and the axis A-A'. And axis C-C', formed by rotating 180 degre...

Embodiment 3

[0080] Figure 4 It is a perspective view showing a surface mount type positive temperature coefficient thermistor 51 of another example (Example 3) of the present invention. Figure 5 It is a plan view showing the insulating case 54 of the surface mount type positive temperature coefficient thermistor 51 .

[0081] Since the surface mount type positive temperature coefficient thermistor 51 is the same as the surface mount type positive temperature coefficient thermistor 21 of Embodiment 1 except for the structure of the insulating case 54, the same symbols are attached to the same parts, And omit detailed description.

[0082] The insulating case 54 of the surface mount type positive temperature coefficient thermistor 51 is formed with an extension 58a extending from one main surface 54b to the opening side 54c and an extension 58b extending from one main surface 54b to the opening side 54d. Protruding portions 59a and 59b are formed at the tips of the portions 58a and 58b,...

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Abstract

The invention provides a surface-mounted positive temperature coefficient thermistor and a manufacturing method thereof. The surface mount type PTC thermistor consists of a plate-shaped PTC thermistor element with electrodes formed on both main surfaces, an insulating case having an inner space into which the PTC thermistor element is inserted, and a The inner space is composed of a pair of metal terminals which are arranged to be electrically connected to both main surfaces of the PTC thermistor element and sandwich the PTC thermistor element. The insulating case has a pair of main surfaces parallel to both main surfaces of the positive temperature coefficient thermistor element arranged in the interior space having a pair of opening side surfaces of an opening exposed to the outside A pair of end faces of the terminal insertion holes are respectively formed. Therefore, when inserting the box body, there is no insertion directionality or only a small directionality, and the advantages of easy manufacture and low cost are obtained.

Description

technical field [0001] The invention relates to a positive temperature coefficient thermistor, in particular to a surface mount type positive temperature coefficient thermistor and a manufacturing method thereof. Background technique [0002] As chip-type positive temperature coefficient thermistors mounted on the surface of a printed circuit board or the like for the purpose of overcurrent protection, products having various structures have been proposed. [0003] Figure 21 This is a cross-sectional view showing an example of the structure of a conventional surface mount type positive temperature coefficient thermistor. (Refer to Patent Document 1). Figure 21 The surface mount type positive temperature coefficient thermistor 1 is inserted into the resin case 3a having the fitting part of the pin terminal insert molding, and the positive temperature coefficient thermistor element 5 formed with electrodes 4a and 4b on both main surfaces is inserted. , In addition, it is se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/02H01C17/02H01C1/012H01C1/022H01C1/14H01C17/28
CPCH01C1/012H01C1/014H01C1/022H01C1/14H01C1/1406H01C17/28Y10T29/49082Y10T29/49085Y10T29/49098Y10T29/49101Y10T29/49139
Inventor 芳贺岳夫田中宏树广田俊春桑原博士
Owner MURATA MFG CO LTD
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