JPH09214156A - Electronic apparatus with heat radiating plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a printed circuit board from damage caused by shock of fall, by providing a rib projected downward from an upper inner face of a case body in a way that the rib is near to and opposite to a side part of a heat radiating plate. SOLUTION: Ribs 6A and 6B are projected downward from an upper inner face of a case body 1 in a way that the ribs 6A and 6B are near to and opposite to each side part of radiating plates 4A and 4B. A printed circuit board 2 is bent when force of shock caused by fall is applied, but the side face of heat radiating plates 4A and 4B mounted on the printed circuit board 2 are fitted at the ribs 6A and 6B halfway. Then, the bending of the printed circuit board 2 is limited. On the other hand, since the printed circuit board 2 is bent until the side part is fitted to the ribs 6a and 6B, the force of shock is absorbed by the movement of bending. In this way, a rate of bent of the printed circuit board 2 is limited, while the force of shock is absorbed by the bent and concentration of stress is reduced in the printed circuit board 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electric equipment such as a charger and a power supply device having a heat sink.

[0002]

2. Description of the Related Art FIG. 4 shows a general electric device having a heat sink. 41 is a body case, 42 is a body case 4
1 is a printed circuit board accommodated in 1; 43 is a printed circuit board 4
Transformers 44A, 44 provided at the substantially center of the upper surface of 2
B is a heat radiating plate which is erected on the upper surface of the printed circuit board 42, and these heat radiating plates 44A and 44B are formed by bending an aluminum plate, an iron plate or the like in a U shape, and sandwiching the transformer 43, the upper surface of the printed circuit board 42. Is attached to the edge of the printed circuit board 42 so as to cover the. Reference numerals 45A and 45B denote leg portions projecting inside the bottom surface of the main body case 41 so that the end portions of the printed circuit board 42 are placed.

In such an electric device, an electronic component (not shown) arranged on the printed circuit board 42 when it is driven.
The heat generated by the transformer 43 and the heat generated by the transformer 43 are efficiently radiated through the heat radiating plates 44A and 44B provided upright on the printed circuit board 42, so that the transformer 43 and the electronic components are not thermally adversely affected. .

[0004]

By the way, the transformer 43 and the heat radiating plates 44A and 4A provided on the printed circuit board 42 are provided.
4B is a heavy item. Therefore, when an impact or the like due to a drop is applied, the printed circuit board 42 is greatly curved and vibrates as shown in FIG. 4, and stress is concentrated particularly on the portions in contact with the leg portions 45A and 45B and cracks are generated. May occur.

In order to prevent the occurrence of such cracks, it is conceivable to form a large number of legs for mounting the printed circuit board 42, but in that case, the printed circuit board 42 is rather replaced.
It was found that the damage to This is because the printed circuit board 42 cannot be bent at all due to the large number of legs, and as a result, the impact force cannot be absorbed and the stress concentration on the printed circuit board 42 increases. It is believed that there is.

On the other hand, electrical equipment such as chargers and power supply devices
Although miniaturization is required year by year, a point to be noted in this case is to sufficiently take measures for insulation of a transformer, an electronic component, an electrical contact or the like provided on a printed circuit board.

Therefore, a first object of the present invention is to prevent the printed circuit board from being damaged by a drop impact or the like.

Further, a second object of the present invention is to sufficiently take measures against insulation of a transformer, an electronic component, an electric contact or the like provided on a printed board.

[0009]

A first electric device according to the present invention is an electric device in which a heat radiating plate is erected on a printed circuit board and is housed in a main body case. A rib is provided so as to face and be close to the side portion of the heat dissipation plate.

In a second electric device according to the present invention, a heat radiating plate is erected on a printed circuit board having a transformer, and the heat radiating plate is housed in the main body case. The electric device is directed downward from the upper inner surface of the main body case. In addition, the transformer is housed, and a rib is provided so as to face and be close to the side portion of the heat dissipation plate.

Further, a third electric device according to the present invention is an electric device in which a heat radiating plate and electric contacts are erected on a printed circuit board and housed in a main body case. It is characterized in that a holding plate for holding the electrical contact is provided so as to be opposed to and close to the portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention. FIG. 1A is a partially cutaway perspective view, and FIG. 1B is a BB line in FIG. Cross-sectional views are shown respectively. 1 is 2
A main body case in which the divided resin cases are integrally formed into a rectangular shape, 2 is a printed circuit board housed in the main body case 1, 3 is a transformer provided substantially in the center of the upper surface of the printed circuit board 4, 4A, 4B are The heat radiating plates are erected on the upper surface of the printed circuit board 2. The heat radiating plates 4A and 4B are formed by bending an aluminum plate, an iron plate, or the like in a U shape, and sandwich the transformer 3 to cover the upper surface of the printed circuit board 2. Thus, it is attached to the edge of the printed circuit board 2. 5A and 5B are printed circuit boards 2
Is a leg portion projecting inside the bottom surface of the main body case 1 so that the end portion of the leg portion is placed.

Reference numerals 6A and 6B are ribs which are a feature of the present invention. These ribs 6A and 6B face the respective side portions of the heat radiating plates 4A and 4B downward from the inner surface of the upper wall of the main body case 1. And it is projected so as to be close.

With respect to such an electric device, when an impact force due to a drop or the like is applied, the printed circuit board 2 is curved, but the side portions of the heat dissipation plates 4A and 4B attached to the printed circuit board 2 are curved. It contacts the ribs 6A and 6B in the middle of. Therefore, the bending of the printed circuit board 2 is limited on the way and does not greatly bend.

On the other hand, the printed circuit board 2 has ribs 6 on its side portions.
Since it bends until it contacts A and 6B, this curvature absorbs the impact force applied to the printed circuit board 2.

As described above, the ribs 6A and 6B projecting downward from the inner surface of the upper wall of the main body case 1 so as to face and be close to the respective side portions of the heat sinks 4A and 4B,
Although the printed circuit board 2 is curved, the degree thereof is appropriately limited, while the printed circuit board 2 absorbs an impact force due to the curving and suppresses concentration of undesired stress. As a result, the printed circuit board 2 is not cracked.

FIG. 2 shows a second embodiment of the present invention. FIG. 2A is a partially cutaway perspective view, and FIG. 2B is a sectional view taken along line BB in FIG. 2A. Shows. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Reference numeral 26 denotes a rib projecting downward from the inner surface of the upper wall of the main body case 1. The rib 26 is provided so as to face and be close to the side portions of the heat radiating plates 4A and 4B, and the transformer 26 It is formed so as to accommodate 3.

In this embodiment, the ribs 26 allow the curving of the printed circuit board 2 but limit the degree of curving, in the same manner as described above.
Shields heat generated by to prevent thermal effects. Further, since the rib 26 surrounds the periphery of the transformer 3, it reliably insulates the transformer 3 from other electronic components (not shown) provided on the printed circuit board 2.

FIG. 3 is a perspective view of an essential part showing a third embodiment of the present invention. In this drawing, the body case 1 shown in FIGS. 1 and 2 is omitted. 32 is a printed circuit board, 33
Is a transformer provided substantially in the center of the upper surface of the printed board 32, and 34A and 34B are heat radiating plates provided upright on the upper surface of the printed board 32. These heat radiating plates 34A and 34B are formed by bending an aluminum plate, an iron plate, or the like in a U shape, and are attached to the edge portion of the printed circuit board 32 so as to sandwich the transformer 33 and cover the upper surface of the printed circuit board 32.

Reference numeral 35 is a holding plate for holding the electrical contacts 36 provided upright on the printed board 32. The holding plate 35 is made of a resin molded product, and has a holding groove for surely holding the electric contact 36 on the surface opposite to the transformer 33. Further, the holding plate 35 is used as the heat dissipation plates 34A, 34A.
It is sandwiched by B and is erected on the edge portion of the printed circuit board 32 so as to face and be close to the respective side portions of the heat dissipation plates 34A and 34B. Specifically, the holding plate 35 is erected by fitting a fitting claw formed on the bottom thereof into a fitting hole of the printed board 32.

In this embodiment, the holding plate 35 permits bending of the printed circuit board 2 but limits the degree of bending thereof, as described above. Further, since the holding plate 35 surely maintains the insulation between the transformer 33 and other electronic components and the electrical contacts 36, the transformer 33 and the electronic components and the electrical contacts 3 are maintained.
It is possible to shorten the distance to the device 6 and to downsize the entire device.

[0022]

According to the present invention, it is possible to prevent the printed circuit board from being damaged by a drop impact or the like.

Further, according to the present invention, it is possible to sufficiently reduce the size of the device and sufficiently take measures against the insulation of the transformer, the electronic parts, the electric contacts, etc. provided on the printed circuit board.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention and is shown in FIG.
Is a partially broken perspective view, and FIG. 6B is a sectional view.

FIG. 2 shows a second embodiment of the present invention and is shown in FIG.
Is a partially broken perspective view, and FIG. 6B is a sectional view.

FIG. 3 is a perspective view of an essential part showing a third embodiment of the present invention.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Body Case 2 Printed Circuit Board 3 Transformer 4A, 4B Heat Radiating Plate 6A, 6B, 26 Rib

Claims (3)

[Claims] 1. An electric device in which a heat dissipation plate is erected on a printed circuit board and is housed in a main body case, faces a side portion of the heat dissipation plate and is close to the main body case downward from an inner surface thereof. An electric device having a heat dissipation plate, characterized in that ribs are provided so as to protrude. 2. An electric device in which a heat dissipation plate is erected on a printed circuit board having a transformer and is housed in a main body case, the transformer is housed downward from an upper inner surface of the main body case, and An electric device having a heat sink, characterized in that ribs are provided so as to face and be close to the side parts of the heat sink. 3. A heat dissipation plate and an electrical contact are provided upright on a printed circuit board, and in an electric device housed in a main body case, the printed circuit board is arranged so as to face and be close to a side portion of the heat dissipation plate. An electric device having a heat dissipation plate, characterized in that a holding plate for holding an electric contact is provided in a protruding manner.