JP2001274577A - Fitting structure of heating element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and efficiently mount a heating element to a heat sink. SOLUTION: A bracket 6 comprises a first clinch part 10 for calking/fixing to the heat sink, a second clinch part 12 for calking/fixing to a circuit board, a hook part 7 for hanging a heating transistor 1 which comprises a fitting hole 2 at the upper part while a plurality of terminals 3 are protruded at the lower part, regulation walls (8a, 8b, 9a, 9b, and 9c) for position-regulating a side surface 1b of the transistor 1, and an elastic piece 11 for elastic contact to a surface 1c opposite to the heat sink side of the transistor 1. With the bracket 6 used, the transistor 1 is provided between a pair of regulation walls by inserting the hook part 7 into the fitting hole 2 to hold the transistor 1 with the bracket 6, while the first and second clinch parts 10 and 12 are bent to calking/fixing the bracket 6 to the heat sink and the circuit board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a comparatively large transistor used for a power amplifier or the like.
The present invention relates to a mounting structure for a heat-generating element that needs to be mounted on a heat sink for heat radiation because of a large amount of heat generation.

[0002]

2. Description of the Related Art A heat-generating element of this type needs to be brought into close contact with a heat sink to enhance the heat radiation effect. As an example of such a heat-generating element, a transistor having a hole for attachment to a heat sink is known. . That is, as shown in FIG. 3, a mounting hole 2 is formed in the upper part of the transistor 1 and three terminals 3 are protruded from the lower part. A screw 4 inserted in the mounting hole 2 is not shown. By screwing to the heat sink, the flat back surface 1a of the transistor 1
Is closely attached to the heat sink to enhance the heat radiation effect.
The terminal 3 is inserted into a terminal insertion hole of a circuit board (not shown), and then soldered and mounted on the circuit board.

[0003]

However, in the above-described prior art, when the heat-generating element (transistor 1) is screwed to the heat sink by using the mounting hole 2, the heat-generating element is shared by the screw tightening force. Since the terminal 3 is easily turned, soldering of the terminal 3 to the circuit board must be performed manually, and there has been a problem that it is difficult to improve the efficiency of the operation by dip soldering. In addition, since a plurality of heat-generating elements of this type are often mounted side by side, a complicated process of manually screwing each of the heat-generating elements to the heat sink and manually soldering each terminal 3 is required. These steps undesirably increase the working time, and it has been practically difficult to efficiently perform the mounting work in a short time.

[0004]

According to the present invention, a bracket for properly regulating the posture of a heat-generating element is used, and the heat-generating element is brought into close contact with the heat sink by fixing the bracket to the heat sink. When such a bracket is used, the position of the heat-generating element is accurately regulated with respect to the heat sink or the circuit board, so that the terminals of the heat-generating element can be soldered to the circuit board without manual work. This is suitable when a plurality of heat generating elements are attached to a heat sink.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a mounting structure for a heat-generating element according to the present invention, a heat-generating element having a mounting hole on an upper part is mounted on a heat sink for heat radiation, and a plurality of heat-producing elements projecting below the heat-generating element are provided. In a mounting structure for a heat-generating element for soldering a terminal to a circuit board, a bracket having a substantially L-shaped hook portion and at least one pair of regulating walls is arranged on the circuit board, and the mounting hole of the heat-generating element is formed in the mounting hole. The exothermic element was brought into close contact with the heat sink by inserting the exothermic element between the pair of regulating walls and restricting the position of the exothermic element while fixing the bracket to the heat sink.

According to this mounting structure, since the rotation of the heating element is prevented by the regulating wall of the bracket only by hooking the mounting hole of the heating element on the hook of the bracket, when the bracket is fixed to the heat sink, The heat generating element is closely attached and fixed to the heat sink while maintaining the correct posture. Therefore, the positional accuracy between the terminal of the heat-generating element and the terminal insertion hole of the circuit board can be ensured, and the work of soldering the terminal to the circuit board can be performed efficiently by dip soldering. Since the exothermic element can be held without being brought into contact with the vicinity of the terminal, there is no fear of causing a short circuit accident of the terminal.

The bracket only needs to be able to hold at least one heat-generating element. The bracket is provided with two or more hooks and three or more regulating walls so that the bracket can hold a plurality of heat-generating elements simultaneously. With this configuration, the work efficiency during mounting is greatly improved by using only one bracket.

Further, when the bracket is provided with an elastic piece for urging the heat-generating element in the direction of the heat sink, even if there is a slight variation in the thickness of the heat-generating element due to a dimensional tolerance or the like, the heat-generating element is formed by the elastic piece. Can be securely adhered to the heat sink.

[0009]

Embodiments will be described with reference to the drawings.
FIG. 1 is a perspective view showing a state in which a transistor is mounted on a bracket according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a state in which a bracket holding the transistor is caulked and fixed to a heat sink and a circuit board. Parts corresponding to those in FIG. 3 used in the description are denoted by the same reference numerals.

As shown in these figures, a transistor 1 as a heat-generating element is the same as a general-purpose product described in the prior art, and a mounting hole 2 is formed in an upper portion of the transistor 1 and a lower portion thereof. Are provided with three terminals 3 protruding therefrom. However, this embodiment is different from the prior art in that
When mounting the transistor 1, a bracket 6 having a predetermined shape is used.

The bracket 6 has three upper end portions,
A substantially L-shaped hook portion 7 that can be hung by mounting the transistor 1 through the mounting hole 2 of the transistor 1 projects laterally (in the direction of arrow A), and the left and right side plates 8 a of the bracket 6. , 8b and these two side plates 8a, 8b
The cut-and-raised pieces 9a, 9b, 9c cut and raised substantially in parallel at three places therebetween function as a regulating wall that regulates the position of the side surface 1b of the transistor 1 suspended on each hook portion 7. Has become. Further, first clinch portions 10 for caulking and fixing to the heat sink 5 are provided on the left and right side plates 8a, 8b of the bracket 6, respectively. In addition, each hook portion 7 is provided at a lower portion of the bracket 6.
At each of the three locations corresponding to, there are provided elongated elastic pieces 11 which extend substantially upward and are slightly inclined in the direction of arrow A, and these elastic pieces 11 are slightly bent by being pushed in the direction of arrow B. be able to. Further, second clinch portions 12 for caulking and fixing to the circuit board 13 are provided at the left and right lower end portions of the bracket 6, respectively.

When the transistor 1 is hung by inserting the mounting hole 2 into the hook portion 7 of the bracket 6 configured as described above, the transistor 1 is positioned vertically and vertically and horizontally. Further, the transistor 1 suspended in this manner is placed between a pair of opposing regulating walls, specifically, between the side plate 8a and the cut-and-raised piece 9a, or the cut-and-raised piece 9
a, 9b, or between the cut-and-raised piece 9c and the side plate 8b, the left and right side surfaces 1b of the transistor 1 are regulated by the pair of regulating walls. It will be held in a suspended and positioned state.

Therefore, after the three transistors 1 are mounted and held on the bracket 6, the first clinch portion 10 is bent while the flat back surface 1 a of each transistor 1 is in close contact with the heat sink 5. When the bracket 6 is fixed to the heat sink 5 by caulking, the transistors 1 are attached to the heat sink 5 in a state where heat can be effectively dissipated. At this time,
The elastic pieces 11 resiliently contact the surface 1c opposite to the back surface 1a of each transistor 1, so that there is no concern that the adhesion between each transistor 1 and the heat sink 5 is impaired. After the terminals 3 of each transistor 1 held by the bracket 6 are inserted into the corresponding terminal insertion holes 14, the second clinch portion 12 is bent and the bracket 6 is crimped to the circuit board 13. If fixed, each transistor 1 will be temporarily fixed to the circuit board 13 via the bracket 6 while maintaining a desired posture, and soldering by dip soldering can be performed without any trouble.

As described above, in this embodiment, the transistor 1 can be easily held (suspended and positioned) by the bracket 6 simply by hooking the hook 7 in the mounting hole 2. Since the first clinch portion 10 can be caulked and fixed to the heat sink 5 only by bending it, the transistor 1 held by the bracket 6 can be easily attached to the heat sink 5 without backlash or tilting without screwing. Can be adhered and fixed. In addition, the bracket 6 holding the transistor 1 in such a state that there is no backlash or inclination,
Since the second clinch portion 12 can be easily caulked and fixed to the circuit board 13 only by bending, each transistor 1 is connected via the bracket 6 while the terminal 3 inserted in the terminal insertion hole 14 is maintained in a desired posture. Thus, the soldering of the terminals 3 to the circuit board 13 can be collectively performed by dip soldering.

In particular, the above-mentioned bracket 6 has three hook portions 7 and five regulating walls (side plates 8a, 8b and cut-and-raised pieces 9a, 9b, 9c).
Since only one bracket 6 can be held at the same time, the mounting operation of soldering the three transistors 1 to the circuit board 13 while keeping the three transistors 1 in close contact with the heat sink 5 can be performed extremely efficiently.

The bracket 6 is provided with an elastic piece 11 for elastically contacting the outer surface of the transistor 1 on the surface 1c on the side opposite to the side that is in close contact with the heat sink 5. Even if there is a slight variation in the thickness of each of the transistors 1, the elastic pieces 11 can be reliably brought into elastic contact with each of the transistors 1 held by the bracket 6, so that each of the transistors 1 can be firmly adhered to the heat sink 5. be able to. Moreover, this bracket 6 suspends the transistor 1 with the hook 7, the pair of regulating walls (for example, the side plate 8 a and the cut-and-raised piece 9 a), and the elastic piece 11 without making contact with the vicinity of the terminal 3 of the transistor 1. Since the holding and the position can be regulated, there is no need to worry that the bracket 6 is brought into contact with the terminal 3, and therefore there is no need to worry about a short circuit accident.

The bracket 6 may have a shape for holding only one transistor 1 or a shape for holding two or four or more transistors. Further, the present invention can be applied to heat-generating elements other than this type of transistor.

[0018]

The present invention is embodied in the form described above and has the following effects.

Just by hooking the mounting hole of the heat-generating element on the hook of the bracket, the position of the heat-generating element in vertical and horizontal directions and in the front-back direction is regulated, and the rotation of the heat-generating element is prevented by the regulating wall of the bracket. Therefore, by fixing the bracket to the heat sink, it is possible to adhere the heat-generating element to the heat sink while maintaining the posture of the heat-generating element correctly, and the work of soldering the terminal to the circuit board can be performed efficiently by dip soldering. it can. In addition, since the bracket can hold the heat-generating element without abutting on the vicinity of the terminal of the heat-generating element, a short circuit accident of the terminal can be reliably prevented.

Further, when the bracket is provided with two or more hook portions and three or more regulating walls so as to simultaneously hold a plurality of heat-generating elements, the bracket can be mounted by using only one bracket. The work efficiency at the time is greatly improved.

Further, when the bracket is provided with an elastic piece for urging the heat-generating element in the direction of the heat sink, even if there is a slight variation in the thickness of the heat-generating element due to dimensional tolerances, etc. Can be securely adhered to the heat sink.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a manner of attaching a transistor to a bracket according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a bracket holding a transistor is fixed to a heat sink and a circuit board in the same embodiment.

FIG. 3 is an explanatory view showing a conventional mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transistor (heat generating element) 1a Back surface 1b Side surface 2 Mounting hole 3 Terminal 5 Heat sink 6 Bracket 7 Hook portion 8a, 8b Side plate (restriction wall) 9a, 9b, 9c Cut-and-raised piece (restriction wall) 10 Clinch section 11 Elastic piece 12 Clinch part 13 Circuit board 14 Terminal insertion hole

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Mitsunori Koyatsu 1-1.8 Nishigotanda, Shinagawa-ku, Tokyo Alpine, Inc. F-term (reference) 4E353 AA06 AA15 AA24 BB07 CC01 CC05 CC08 CC13 CC33 DD11 DD12 DR02 DR19 DR22 DR29 DR34 DR36 DR42 DR57 EE07 GG17 GG21 5E322 AA11 AB04 AB05 AB07

Claims (3)

[Claims] A heat-generating element having a mounting hole at an upper portion thereof is mounted on a heat sink for heat radiation, and a plurality of terminals projecting from a lower portion of the heat-generating element are soldered to a circuit board. In the structure, a bracket having a substantially L-shaped hook portion and at least a pair of regulating walls is arranged on the circuit board, and the mounting hole of the heat generating element is inserted through the hook portion, and the heat generating element is paired with the heat generating element. The mounting structure of the heat-generating element, wherein the heat-generating element is brought into close contact with the heat sink by fixing the bracket to the heat sink by disposing the heat-generating element between the restriction walls. 2. The bracket according to claim 1, wherein the bracket is provided with at least two hook portions and at least three regulating walls, and the bracket is configured to simultaneously hold the plurality of heat-generating elements. A mounting structure for a heat-generating element. 3. The mounting structure for a heat-generating element according to claim 1, wherein an elastic piece for urging the heat-generating element toward the heat sink is provided on the bracket.