JP2010087031A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus in which a fixed component fixed to a heat-radiating plate with screws can be readily attached or removed. <P>SOLUTION: The electronic apparatus includes: a circuit board 1; a plurality of electronic components mounted on the circuit board 1; a heat-radiating plate 11 provided on the circuit board 1; and an electronic component 2 and a fitting 31 to be fixed to the heat-radiating plate 11 with screws, wherein the electronic component 2 and the fitting 31 are fixed on one side surface 12A of the heat-radiating plate 11 and the plurality of mounting components are disposed on the other side of the heat-radiating plate 11. With this configuration, the electronic component 2 and the fitting 31 fixed to the heat-radiating plate 11, with the screws 21 can be easily attached or detached without being interfered by the other mounting components. Furthermore, when the screws 21 are attached in substantially the same direction, the screws 21 can be moved with a screw driver etc. from the same direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic apparatus including a circuit board, a plurality of mounting components mounted on the circuit board, a heat sink provided on the circuit board, and a fixing component fixed to the heat sink with screws.

Generally, in various electronic devices such as unit power supplies, heat generating components such as power transistors and rectifier diodes are mounted on a circuit board together with various electronic components. In order to suppress the temperature rise of these heat generating components, heat conduction A heat radiating plate such as aluminum, which is excellent in performance, is thermally connected to the back surface of the electronic component, and a plurality of electronic components are fixed to both surfaces of the heat radiating plate by screws (for example, Patent Document 1).
JP 2002-290084 A

  Various types of heat sinks are used, such as a substantially flat plate and a bent one in the shape of an L. However, since heat-generating parts are fixed on both sides of the heat sink, the screws are removed with a screwdriver or the like. However, other electronic components mounted on the circuit board become an obstacle, and there is a problem that a lot of man-hours are required for parts change, disassembly for repair or disposal.

  In addition, it is necessary to operate the screws from both sides of the heatsink during installation and removal work, and the work efficiency is lower than when operating the screws from one side. In a structure in which a plurality of heat generating components are fixed, the operating direction of the screwdriver is different on both sides of the bent portion, so that the attaching and removing operations cannot be performed efficiently.

  The present invention has been made paying attention to each of the above-mentioned problems, and an object thereof is to provide an electronic device that can easily attach and remove a fixing component fixed to a heat sink with screws. .

  In order to achieve the above object, the present invention provides a circuit board, a plurality of electronic components mounted on the circuit board, a heat sink provided on the circuit board, and a fixed component fixed to the heat sink with screws. In the electronic device comprising: a plurality of the fixing components are fixed to one side of the heat dissipation plate, and the fixing components can be attached from the outside, and the plurality of mounting components are arranged on the other side of the heat dissipation plate. It is configured.

  In the present invention, in order to achieve the above object, the mounting directions of the plurality of screws for fixing the plurality of fixing parts are substantially the same.

  Furthermore, in the present invention, the fixed component is a positioning member that positions the heat generating component and the heat generating component.

  According to the first aspect of the present invention, it is possible to easily attach and remove the fixed component fixed to the heat sink with screws without receiving interference from the mounted component.

  According to the invention of claim 2, since the screw can be operated from the same direction by a screwdriver or the like, it is possible to easily fix and release the plurality of fixing parts with the screw.

  According to invention of Claim 3, positioning members other than the heat-emitting component mounted in a circuit board can also be attached and removed simply.

  Hereinafter, a preferred embodiment of an electronic device according to the present invention will be described in detail with reference to the accompanying drawings.

  1 to 3 show an electronic device proposed in this embodiment. As shown in the figure, reference numeral 1 denotes a circuit board in which a conductive pattern is formed on one side or both sides of an insulating layer, and has a substantially rectangular plane. Reference numerals 2 and 2A denote electronic components which are heat generating components having a particularly large calorific value provided on the surface of the circuit board 1, that is, the component mounting surface, and are fixed components to which the electronic components 2 are fixed to a heat sink described later. In these electronic components 2 and 2A, a conductive lead 4 extending to the lower end of the component body 3 is inserted into a plated through hole (not shown) formed at a predetermined position of the circuit board 1, and soldered there. Then, it is mounted on the circuit board 1.

  Reference numeral 11 denotes a heat radiating plate made of a member having excellent conductivity such as aluminum, which includes a vertical portion 12 substantially orthogonal to the circuit board 1 and a bent edge obtained by bending the upper end of the vertical portion 12 outward (to one side). The part 13 and a plurality of legs 14 extending downward from the vertical part 12 are generally configured, and the plurality of legs 14 are fixed to the component mounting surface side of the circuit board 1.

  The heat sink 11 is provided along both longitudinal sides of the circuit board 1 having a rectangular shape when viewed from the component mounting surface side of the circuit board 1 and closer to one side in the width direction of the circuit board 1. On the other hand, a plurality of electronic components 5 are mounted on the component mounting surface located on the other side of the heat sink 11.

  The plurality of electronic components 2 are fixed to the one side surface 12 </ b> A on the outer side of the vertical portion 12 of the heat radiating plate 11 with screws 21 in a close contact state. In this case, the component body 3 of the electronic component 2 is provided with an insertion hole 22 through which the screw 21 is inserted, and a tap hole 23 is formed in the vertical portion 12 corresponding to the insertion hole 22, so that the heat radiating plate 11. From one side, the electronic component 2 is fixed to the heat sink 11 by inserting the screw 21 into the insertion hole 22 and screwing it into the tap hole 23. The insertion hole 22 may be a tap hole into which the screw 21 is screwed.

  The electronic component 2 </ b> A is fixed to one side surface 12 of the vertical portion 12 of the heat sink 11 by a fixture 31 as a fixing component. The fixing tool 31 is made of a steel plate such as stainless steel for springs, and integrally includes a pressing portion 32 for pressing the component main body 3 of the electronic component 2 </ b> A and a fixing portion 33 for fixing to the heat radiating plate 11. Is provided with an insertion hole 34 through which the screw 21 is inserted. Then, the component body 3 of the electronic component 2 </ b> A is covered with a cylindrical insulating sheet 41 that is an insulating material, and the component body 3 that covers the insulation sheet 41 is inserted in a state where it is gradually pressed by the pressing portion 33. The component body 2 </ b> A of the electronic component 2 </ b> A is fixed to the radiator plate 11 by inserting the screw 21 into the hole 34 and screwing the screw 21 into the tap hole 23 of the radiator plate 11. The insertion hole 24 may be a tap hole into which the screw 21 is screwed.

  When the electronic components 2 and 2A generate heat as the temperature of the electronic components 2 and 2A rises, heat is directly conducted to the vertical portion 12 of the heat radiating plate 11, and the air around the vertical portion 12 and the bent edge portion 13 is present. Heat is exchanged with the heat.

  In the electronic apparatus as described above, the heat sink 11 is disposed on one side of the circuit board 1, the plurality of electronic components 2 and the fixture 31 are provided on one side of the heat sink 11, and the circuit is provided on the other side of the heat sink 11. An electronic component 5 is mounted on the substrate 1. Therefore, the screw 21 of the electronic component 2 and the screw 21 of the fixture 31 can be operated without being interfered by the electronic component 5.

  In addition, since the plurality of electronic components 2 and the screws 21 of the fixture 31 are screwed in the same direction, the plurality of screws 21 can be operated from the same direction by the driver 101 or the like.

  Thus, in this embodiment, the circuit board 1, the plurality of electronic components 5 mounted on the circuit board 1, the heat sink 21 provided on the circuit board 1, and the fixed component fixed to the heat sink 21 with screws. In an electronic device including the electronic component 2 and the fixture 31, the electronic component 2 and the fixture 31, which are a plurality of fixing components, are fixed to one side surface 12 </ b> A of the heat sink 11, and the electronic component 2 and the fixture 31 are outside. Can be attached to the heat sink 11, and a plurality of mounting components 5 are arranged on the other side of the heat sink 11, so that mounting and removal of the electronic component 2 and the fixture 31 fixed to the heat sink 11 with screws 21 are performed. This can be easily performed without receiving interference from other mounting parts.

  Further, in this embodiment, since the mounting directions of the plurality of screws 21 for fixing the electronic component 2 and the fixture 31 are substantially the same, the screws 21 can be operated from the same direction by the driver 101 or the like. The plurality of electronic components 2 and the fixing tool 31 can be easily fixed and released with the screw 21.

  As described above, in this embodiment, the fixing component is the fixing component 31 that is a positioning member that positions the electronic component 2 that is a heat generating component and the heat generating component 2A that is a heat generating component, and therefore, other than the heat generating component 2 that is mounted on the circuit board 1. The fixing tool 31 can be easily attached and detached.

  Further, as an effect of the embodiment, the plurality of electronic components 2 and the screw 21 of the fixture 31 can be operated using the same driver 101 because the shape of the minus groove as the tool engaging portion is the same.

  In addition, this invention is not limited to the said Example, A various deformation | transformation implementation is possible in the range of the summary of this invention. For example, in the examples, one side is illustrated as being continuously flat, but one side is composed of a plurality of parallel surfaces, or one side of a plurality of heat sinks is arranged in parallel. Also good.

It is a front view which shows Example 1 of this invention. It is a side view same as the above. It is a top view same as the above.

Explanation of symbols

1 Circuit board 2 Electronic parts (fixed parts / heat generating parts)
2A Electronic parts (heat generating parts)
3 Component body 5 Electronic component 11 Heat sink (fixed part)
21 Screw 31 Fixing tool (fixing part)

Claims (3)

In an electronic device comprising a circuit board, a plurality of electronic components mounted on the circuit board, a heat sink provided on the circuit board, and a fixed component fixed to the heat sink with screws, one of the heat sinks An electronic apparatus comprising: a plurality of fixing parts fixed to a side surface; the fixing parts being attachable from the outside; and the plurality of mounting parts being arranged on the other side of the heat sink. The electronic device according to claim 1, wherein mounting directions of the plurality of screws for fixing the plurality of fixing parts are substantially the same. The electronic device according to claim 1, wherein the fixing component is a positioning member that positions the heating component and the heating component.