JP2000077815A - Power supply structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve the simple and compact configuration of the structure of a power supply system, which supplies the electric power to the main board wherein CPU is mounted from supply board in a portable computer. SOLUTION: On the surface of a main board 26, a standoff made of aluminum, which is electrically connected to the wiring of the main board 26, is provided. In the standoff 38, a screw hole 40 is provided in the direction perpendicular to the main board 26. In a power supply board 28, a through hole 42 and a contact point 44, which is provided around the hole 42 and electrically connected to the wiring of the power supply board 28, are provided. Then, a bolt 46 is made to pass the through hole 42 and is connected to the screw hole 40, and the standoff 38 and the contact point 42 are brought into contact. Thus, the main board 26 and the power supply board 28 are electrically connected, and the power supply structure is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply structure for supplying power from a power supply board to a main board on which a central processing unit (hereinafter referred to as a CPU) of a portable electronic device is mounted.

[0002]

2. Description of the Related Art In recent years, portable electronic devices such as portable computers have been commercialized. These devices are always required to be reduced in size and weight. In a portable computer, there is an example in which an FDD (flexible disk drive) or the like is provided separately to reduce the size and weight of the main body. In this case, the power of the external device such as the FDD is supplied from the main body.
That is, a power supply connector is provided on the surface on the back side of the surface on which the keyboard and the like are arranged. This power supply connector is mounted on the back surface of the power supply board in the main body. For this reason, the power supply board needs to be arranged at an interval from the bottom surface of the main body housing. When the main board on which the CPU is mounted is integrated with the power supply board, that is, when power supply components are mounted on the main board, the above-described space is also formed between the main board and the bottom surface of the main body housing, so that the waste is generated. Space occurs. Therefore, an arrangement is adopted in which the main board and the power supply board are separated from each other, and a step is provided between the main board and the power supply board.
In other words, the power supply board is arranged so as to float relative to the main board by the amount corresponding to the connector mounting. In order to supply power from the power supply board to the main board, connectors are provided on both boards, and the connectors are connected by cables.

[0003]

As described above, when connectors and cables are used to supply power from the power supply board to the main board, the space occupied by these components is large, which hinders miniaturization of equipment. There was a problem. In particular, C
As the performance of PUs improves, the power supply increases, the connectors and cables also increase in size, which goes against the demand for miniaturization. There is also a problem that power consumption and heat generation are large due to the resistance of the cable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and provides a power supply structure between a main board and a power supply board which are provided with a step and which can achieve miniaturization and power saving. The purpose is to:

[0005]

In a power supply structure according to the present invention, a main board on which a central processing unit is mounted, a power supply board for supplying power to the main board and an external accessory device,
Wherein the main board is electrically connected to wiring of the main board, is fixed to the surface of the main board, has a standoff provided with a screw hole, and the power board is A connector for supplying power to the external accessory device is mounted on the back surface, and a through hole is provided at a position corresponding to the stand-off of the main board on the back surface, and the wiring of the power supply board is electrically connected around the through hole. A contact that connects to the standoff and the contact by a bolt that penetrates the through hole and couples to the screw hole, and electrically connects the main board and the power supply board. is there.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a portable computer to which the power supply structure according to the embodiment is applied. Some parts not related to the power supply structure are omitted. The main body 10 includes a bottom housing 12.
And a cover housing 14, in which components such as various substrates, batteries, and memories are stored. The main body 10 formed of the two housings 12 and 14 is provided with two openings on the upper surface in the figure, and a keyboard 16 is provided in an opening at the back of the operator and a front pad is provided with a pointing pad at an opening in the front. A cover 18 is provided. The front cover 18 serves as a palm rest when operating a keyboard or the like. A lid 20 is provided to be openable and closable on a surface of the main body 10 on which the keyboard 16 is provided. The lid 20 rotates around an axis provided on one side on the back side of the main body, and the opening and closing operation is performed by this rotation. With the lid 20 open, the lid 20
A flat display device such as a liquid crystal display device 22 is provided on the surface on the operator side. A main board 26 on which the CPU 24 is mounted, and a power supply board 28 for supplying power to the main board 26,
It is arranged in the bottom housing 12. A signal connector (not shown) for connecting to an extension unit 30 equipped with a plurality of devices such as an FDD and a CD-ROM (compact disk read only memory) and a power supply connector 32 (see FIG. 2) are provided on the bottom surface of the main body 10. ) Is provided. An opening is provided in a portion of the bottom housing 12 corresponding to the two connectors, and when the extension unit 30 is not used, the slide cover 34 covers the connector. When the extension unit 30 is used, the slide cover 34 is opened, the connector is exposed, and the extension unit 30 is connected to the external attachment device 30.

FIGS. 2 and 3 show details of a power supply structure for supplying power from the power supply board 28 to the main board 26. FIG. On the power supply board 28, components 36 constituting a power supply circuit are mounted on a front surface facing the keyboard, and a power supply connector 32 is provided on the opposite surface, that is, on the back surface. Since the power supply connector 32 is disposed on the back surface, the power supply board 28
From the bottom surface of the bottom housing 1
2 and the slide cover 34 are arranged with an interval enough to be accommodated. On the other hand, the main board 26 has the CPU 24, which is a tall component, mounted thereon, and is therefore arranged so as to be in close contact with the bottom housing 12. As described above, a step h is formed between the main board 26 and the power supply board 28 as shown in FIG. This step h is about 1.2 mm in this embodiment. The main substrate 26
And the power supply board 28 have an overlapping portion that is a portion that overlaps in the planar arrangement.

[0008] Two standoffs 38 are fixedly arranged on the surface of the main substrate 26 at the overlapping portion. The standoff 38 is a conductor electrically connected to the wiring of the main substrate 26, and in this embodiment, is a column of aluminum fixed by soldering. The standoff 38 has a screw hole 4 in a direction substantially orthogonal to the main board 26.
0 is provided. In the overlapping portion of the power supply board 28, a portion corresponding to the screw hole 40 of the standoff 38,
A through hole 42 penetrating through the power supply board 28 is provided. Metal foil contacts 44 connected to the wiring of the power supply board 28 are provided on both the front and back surfaces of the power supply board 28 around the through hole 42. Then, the two bolts 46 are passed through the through holes 42 and screwed into the screw holes 40, so that the standoffs 38 and the contacts 44 are brought into contact. As a result, the main board 26 and the power board 28 are electrically coupled, and a power supply structure from the power board 28 to the main board 26 is formed.

With the above power supply structure, the main substrate 2
A connector and a cable for coupling the power supply 6 to the power supply board 28 are not required, and the space occupied by the power supply system can be reduced. Therefore, the size and thickness of the device can be reduced. In addition, the electric resistance can be reduced, heat generation can be suppressed, and power consumption can be reduced as compared with the connection using a connector and a cable. By reducing the heat generation, the load on the cooling device is reduced, which can be reduced in size, which indirectly contributes to the miniaturization and thinning of the device. In addition, by saving power, the capacity of the battery can be reduced, which can indirectly contribute to miniaturization and thinning of the device.

[0010]

Since the present invention is configured as described above, the structure of the power supply system is simplified and the space occupied by the power supply system is reduced, so that the device can be made smaller and thinner. It works. Further, since the electric resistance is reduced, there is an effect that the amount of generated heat is reduced and power saving is achieved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a portable computer employing a power supply structure of the present invention.

FIG. 2 is a diagram showing details of the embodiment of the present invention, and is a sectional view of the computer shown in FIG. 1;

FIG. 3 is a diagram showing details of the embodiment of the present invention, and is an exploded perspective view of the inside of the computer shown in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Main body, 12 Bottom housing, 14 Cover housing, 16 Keyboard, 24 CPU, 26 Main board, 28 Power supply board, 30 Expansion unit, 32 Power supply connector, 38 Standoff, 40 Screw hole, 4
2 Through holes, 44 contacts, 46 volts.

Claims (1)

[Claims] 1. A portable electronic device comprising: a main board on which a central processing unit is mounted; and a power supply board for supplying power to the main board and an external accessory device, wherein the main board is connected to wiring of the main board. The power supply board has a standoff provided with a screw hole, which is electrically connected and fixed to the front surface of the main board, and a connector for supplying power to the external accessory device is mounted on the back surface of the power supply board, and A back hole, at a position corresponding to the stand-off of the main board, a through hole, and a contact around the through hole to be electrically connected to a wiring of the power supply board; A power supply structure, wherein the standoff and the contact are brought into contact with each other by a bolt coupled to the main substrate, and the main substrate and the power supply substrate are electrically coupled.