JPH0638468Y2 - Radiator of electronic components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a structure of a radiator for heat-generating components used in electronic equipment.

<Prior Art> Audio amplifiers, wireless devices, measuring instruments, control devices or high-density mounting electrical devices incorporate heat-generating components such as resistors, power transistors, and high-power thyristors. The heat-generating component is attached to the radiator to prevent the heat-generating component from being destroyed by heat. The size and shape of the radiator are designed according to the amount of heat generated by heat-generating components, the allowable temperature range, and the operating conditions of electrical equipment.

As shown in FIG. 2, a relatively simple radiator uses a flat plate 1 made of aluminum, copper or the like having good heat conduction, and a heat-generating component 2 such as a power transistor is tightly fixed to the heat radiating plate 1 with screws 3. The heat radiation plate 1 is fixed to the wiring board 4. The heat radiating plate 1 has a larger width and / or height than the component 2 in order to increase the heat radiating effect. Alternatively, the extended portion of the heat dissipation plate is bent for arrangement with other components and the like.

<Problems to be Solved by the Invention> Since the heat dissipation plate is formed to have a width and / or a height larger than that of the heat-generating component, it is very bulky, which is contrary to high-density mounting and makes the electric device large. The plate-shaped heat sink adheres only to one side of the component and radiates heat only on one side.
This causes thermal imbalance of the heat-generating components, causing damage to the components.
For this reason, it is desirable that the heat radiation plate is closely attached to both surfaces of the heat generating component. In this case, the mounting portion of the heat sink is formed by extending one side of the heat sink, but the heat sink has an asymmetrical shape because of the extended portion. Asymmetrical machining requires a great deal of care to the operator and reduces efficiency.

<Means for Solving the Problems> The present invention has a structure in which the heat sink is bent equally to the depth of the heat generating component and the heat sink is closely adhered to both sides of the heat generating component, and the heat sink is designed line-symmetrically and bent. In the case of, it is characterized by eliminating the left-right directionality.

That is, a hole through which a screw penetrates is formed on the center line of the flat plate, and a screw hole for fixing a heat-generating component and a radiator is formed on a parallel line parallel and axisymmetric to the center line, and the center line and the above-mentioned The distance between the two valley lines is equal to the depth of the heat-generating component, and the distance between the center line and the valley line and the distance between the one parallel line and the valley line are equal to each other. Bend along the fold line, and fold in a mountain fold at a position where the distance from the valley fold line between the center line and the other parallel line is higher than the height of the heat generating component, and fold the heat generating component to the radiator. It has a structure in which it is inserted inside, a screw is passed through the hole, and the screw hole tightens and fixes.

Further, it is characterized in that the space formed by the radiator and the heat generating component, or the space formed by the heat radiating plate, the heat generating component and the wiring board is aligned with the direction of thermal convection.

<Operation of the device> The heat dissipation plate is bent and adheres to both sides of the heat generating component, so that the heat dissipation effect is enhanced. Further, since heat is dissipated equally from both sides of the heat generating component, thermal imbalance does not occur. Since the heat sink is bent and comes into close contact with the heat-generating component, there is less obstruction.

Further, according to the present invention, the space formed by the heat sink and the heat-generating component or the space formed by the heat sink, the heat-generating component and the wiring board is aligned with the direction of the heat convection. , The heat dissipation effect is improved.

Since the hole and the screw hole formed in the heat sink of the present invention are formed in the center line of the flat plate and at the line symmetrical position with respect to the center line, there is no front and back and left and right directionality in the bending process.

<Example> The radiator 11 is made of an aluminum plate, has a width W2 substantially equal to the width W1 of the power transistor 12, has a height H2 higher than the height H1 of the power transistor 12, and has a depth D1 of the power transistor 12. It is bent to a depth D2 which is almost equal to. The radiator 11 includes a mounting bent portion 15 for mounting on the circuit board 13. The detailed design of the radiator 11 is as shown in FIG. 4 mm holes A1 and A2 through which a screw penetrates are formed on the center line 1 in the long side direction of a rectangular aluminum flat plate having a width W2 and a length L on both sides. Small-diameter screw holes A3, A4 for fixing the radiator 11 to the circuit board at the line symmetrical position of the center line 1, and a 3 mm hole A5 for fixing the circuit board together with the transistor fixing and the radiator to the equipment case, Form A6, A7, A8 on both sides. This plate is in the right half of the center line 1
And two valley fold lines 12 and 13 are provided so as to sandwich the transistor between the line 11 in which the holes A5 and A6 are formed. The distance D2 between lines 12 and 13 is equal to the depth D1 of the transistor, and
The intervals B between 12, 11 and 13 are made equal. Also, the center line 1 of the flat plate
In the left half of, the mountain fold line 14 is formed at a position where the distance from the line 12 is equal to H2.

In the radiator designed as described above, holes A1 to A8 are first processed in an aluminum flat plate, and then the outer shape is cut. After that, the folding process is performed along the valley fold lines 12 and 13 and the mountain fold line 14 as shown in FIG. Holes A1 to A8 are line 1 in this embodiment.
Since it is located in line symmetry with respect to the flat plate, when it is bent, the flat plate has only the direction of the long side and the short side, and there is no directionality of the front and back and left and right, so the bending work is easy. The mistakes are reduced.

In contrast to the radiator configured as described above, the power transistor 12 is inserted inside the bent portion of the radiator 11 and
Both sides of the power transistor 12 and the radiator 11 are closely attached and fixed by tightening the screws 14 and 14 penetrating the screw holes A1A2 and A5A6 in the front and rear directions on the left and right.

The lead terminal of the power transistor 12 is connected to the circuit board 13, and the mounting bent portion 15 of the radiator 11 is formed on the circuit board.
It is fixed to 13 using screw hole A3. After the circuit board 13 is soldered by the dipping process or the like, the circuit board 13 is screwed to the mounting leg of the device case by the screw holes A7 and A8 of the radiator.

Then, the space 16 formed by the radiator 11 and the power transistor 12 or the space 17 formed by the radiator 11, the power transistor 12 and the wiring board 13 is arranged so as to coincide with the direction of thermal convection, that is, the vertical direction. Since the spaces 16 and 17 act as a chimney to promote convection, the heat dissipation effect is enhanced.

<Advantages of the Invention> The radiator of the present invention radiates heat well and does not cause thermal imbalance in the heat-generating components. In addition, the radiator is bent so that there is less obstruction.

Since the radiator of the present invention has holes and screw holes formed in the center line of the flat plate and symmetrically with respect to the center line, there is no directionality in the front and back and right and left in the case of bending work, and the work efficiency is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view of a radiator of the present invention, FIG. 2 is an external view of a conventional radiator, FIG. 3 is a plan view of the radiator, and FIG. 4 is a fold of the radiator. The song chart is shown. 11 …… Heat radiator, 12 …… Power transistor 13 …… Circuit board, 16,17 …… Space

Claims (2)

[Scope of utility model registration request] 1. A radiator comprising a heat radiating plate portion closely contacting with both surfaces of a heat generating component and a mounting bent portion formed only on one side of the heat radiating plate portion, wherein a screw penetrates on a center line of the flat plate. And a screw hole for fixing the heat-generating component and for fixing the radiator are formed on a parallel line that is parallel and axisymmetric to the center line, and two screw holes are formed between the center line and the one parallel line. The distance between the valley fold lines is equal to the depth of the heat-generating component, and the distance between the center line and the valley fold line and the distance between the one parallel line and the valley fold line are equal, and the two fold lines are bent to form the center line and the fold line. Between the other parallel lines, fold into a mountain fold at a position where the distance from the valley fold line is higher than the height of the heat-generating component, insert the heat-generating component inside the fold of the radiator and penetrate the screw into the hole. Electronic, characterized by tightening and fixing with the above screw holes Radiator of goods. 2. The radiator of an electronic device according to claim 1 of the utility model registration, wherein the space formed by the radiator and the heat-generating component is arranged so as to coincide with the direction of thermal convection. Radiator.