JP2006303281A - Portable electronic appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable electronic appliance wherein an external pressure is so applied hardly to a circuit board mounted with electronic components which is integrated into its thin-walled/light outer-block housing as to prevent the solder peeling and the cracking, etc. of the circuit board. <P>SOLUTION: The portable type electronic appliance has a box-form outer-block housing 4 and has a circuit board 1 fastened to the outer-block housing 4 only by the outer peripheries of the side surfaces of the outer-block housing 4. The fastening portions of the circuit board 1 are so concentrated to at least the half scope of the whole of the plane of the circuit board 1 that it is nearly fastened to the outer-block housing 4, i.e., it has a floating structure. Therefore, even when so applying a pressure to the outer-block housing 4 as to deform it, the distortion of the circuit board 1 can be made small. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a small portable device such as a notebook personal computer (hereinafter referred to as a notebook personal computer) or a portable DVD player.

  In recent years, in portable information processing apparatuses such as notebook personal computers and small portable electronic devices such as portable DVD players, the frequency of being carried outdoors is increasing. Therefore, when the transportation means is a crowded train or the like, the frequency with which the portable device is pressed through a bag or the like is increased, and the casing of the portable device is deformed by the pressure from the outside and built in There is a risk of affecting the circuit board on which the electronic component is mounted. On the other hand, the number of signals of electronic components mounted on a circuit board is increasing with the miniaturization of components, expansion of functions, and improvement of performance. For this reason, the mounting parts are becoming BGA, and the pitch is narrowed and miniaturized. Along with this, the soldering mounting strength of the electronic component itself is reduced. In addition, in order to comply with the EU Directive (RoHS) related to regulations on the use of specific hazardous substances, the use of hazardous substances such as lead is prohibited, the lead-free soldering part has progressed, and the soldering strength is further reduced.

  FIG. 3 is an internal plan view showing the structure of a conventional portable electronic device, and FIG. 4 is a sectional view. In the figure, 11 is a circuit board on which an electronic component 12 and a connector 13 are mounted, 14 is an outer casing of a portable electronic device, and the circuit board 11 passes through a plurality of bosses 14a provided in the outer casing 14 through holes 11a. It was attached with screws 15. The connector 13 is also fixed to the outer casing 14 with screws 16. In the case of such a structure, when the outer casing 14 is deformed by receiving an external force, the circuit board 11 is also deformed. At this time, the soldered portion of the electronic component 12 mounted on the circuit board 11 by soldering may be peeled off or the circuit board 11 itself may be cracked.

  In particular, when the circuit board is fastened to the outer casing together with screws, when the outer casing is pressurized, the force applied to the circuit board from the outer casing is large, the distortion of the circuit board is large, and the mounting component In many cases, a force is applied in the direction in which the soldering is peeled off, and the circuit board is damaged.

For this reason, the structure for protecting the circuit board which mounted the electronic component from external force is devised.
In the prior art, in order to give strength to the outer casing that plays a role in protecting the circuit board, the outer casing is made thicker or reinforced with ribs or the like.

Moreover, in order to reduce the mutual influence of the circuit board and the outer casing, as an example of devising the mounting method of the circuit board, for example, there is one shown in Patent Document 1, but what is described in Patent Document 1 When the circuit board is bent and attached to the bottom surface of the device body, a holder is interposed to prevent the bottom surface of the device body from being deformed by the reaction force of the circuit board.
JP-A-3-145196

  However, the portable electronic device having the above-described conventional configuration has the following problems.

  (1) If the weight of the portable electronic device itself is ignored, if the surface strength can be ensured by increasing the thickness of the outer casing or the like, the influence on the circuit board will be reduced. In mobile electronic devices, “portability” is very important, that is, weight reduction is a factor that cannot be ignored.

  (2) In Patent Document 1, the reaction force of the circuit board is prevented from affecting the housing. However, in recent portable electronic devices, the circuit board itself is also reduced in weight, The strength is reduced, making it easy to break and distort.

  The present invention solves the above-described conventional problems, makes it difficult for external pressure to be applied to a circuit board mounted with electronic components built in a thin and lightweight outer casing, and prevents solder peeling or cracking. An object of the present invention is to provide a portable electronic device that does not cause generation.

  In order to solve the above-described conventional problems, the portable electronic device of the present invention is a portable electronic device having a box-shaped outer casing and a circuit board fixed to the outer casing only at the outer peripheral portion of the box-shaped outer casing. Accordingly, it is possible to provide a portable electronic device in which external pressure is not easily applied to the circuit board on which the electronic component is mounted, and solder peeling or cracking does not occur.

  According to the portable electronic device of the present invention, when aiming at further weight reduction, as a measure for protecting the circuit board, which is a problem, the circuit board and the housing are not partially tightened, and the circuit board is retained. Since a slight floating structure is used, there is an advantageous effect that the circuit board is less distorted and the circuit board can be protected.

  The invention according to claim 1 of the present invention is a circuit in which a box-shaped outer casing and a substantially rectangular outer peripheral part are fixed only, and the fixing points are concentrated in at least a half of the entire plane. This is a portable electronic device having a substrate, and has an effect that it is possible to provide a portable electronic device having a substrate that is difficult to be subjected to external pressure on a substrate including an electronic mounting component and is not easily destroyed.

  The invention according to claim 2 is characterized in that, in the portable electronic device according to claim 1, the circuit board is fixed only in the vicinity of the two side surfaces of the box-shaped outer casing, Similar to the first aspect, it is possible to provide a portable electronic device to which an external force is hardly applied.

  According to a third aspect of the present invention, in the portable electronic device according to the second aspect, the circuit board and the outer casing are in contact with each other via an elastic body except in the vicinity of the side surface of the outer casing. Because it is an elastic body, it does not transmit pressure directly, and can be installed where it needs to be held, providing a more stable holding structure. Has the effect of being able to.

  According to a fourth aspect of the present invention, in the portable electronic device according to the second aspect, the circuit board has a hole or a notch for avoiding contact with a boss or the like of the outer casing except in the vicinity of the side surface of the outer casing. Is provided, and has the effect of being able to be less affected by deformation of the outer casing.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
1 is an internal plan view of a portable electronic device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view, FIG. 2 (a) is a cross-sectional view AA in the plan view, and FIG. B is shown.

  In the figure, reference numeral 1 denotes a circuit board on which an electronic component 2 and a connector 3 are mounted, and has holes 1a and 1b. Reference numeral 4 denotes a box-shaped outer housing having bosses 4a and 4b. 5 is a cylindrical elastic body, and 6 and 7 are screws.

  As shown in the figure, the circuit board 1 on which the electronic component 2, the connector 3 and the like are mounted is fixed to the boss 4a of the outer casing 4 near the outer periphery by screws 6 through the holes 1a. Is fixed to the side surface of the outer casing 4 by screws 7. The circuit board 1 has a substantially rectangular shape, and the screw 6 and the screw 7 are fixed to the outer casing 4 near the two side surfaces of the outer casing 4 and at least the entire plane of the circuit board 1. It is limited to a range of 1/2. The other portions are provided with holes 1b and cutouts 1c for holding the bosses 4b through the cylindrical elastic body 5 in the holes 1a and avoiding contact with the bosses 4c for fixing the housing. The floating structure is substantially fixed to the outer casing 4.

  As a result, even when external pressure is applied to the outer casing 4 of the portable electronic device, it is difficult for external force to be transmitted to the inner circuit board 1, and the circuit board 1 is not affected by the deformation of the outer casing 4. It is possible to protect the circuit board 1 and prevent the circuit board 1 from being damaged such as cracking or solder peeling.

  In addition, by arranging a buffer material such as the elastic body 5 for holding the circuit board 1, the hardness of the buffer material can be adjusted and the buffer region of the circuit board 1 can be controlled. That is, when a large external load such as a drop of the portable electronic device is applied, the movement of the circuit board 1 can be minimized, and the repeated minute load can be reduced in the buffer space. Due to the relaxation, an effect that it is difficult to apply stress to the circuit board 1 is obtained.

  The portable electronic device according to the present invention can realize a circuit board holding structure in which the distortion of the circuit board is reduced by fixing the circuit board only at the outer peripheral portion of the side surface of the box-shaped housing to form a floating structure. Therefore, it is useful as a portable information processing device such as a notebook personal computer or a small portable electronic device such as a portable DVD player.

The internal top view of the portable electronic device of one embodiment of this invention Sectional drawing of the portable electronic device of one Embodiment of this invention Internal plan view of a conventional information processing apparatus Sectional view of a conventional information processing device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit board 1a, 1b Hole 1c Notch 2 Electronic component 3 Connector 4 Outer housing 4a, 4b, 4c Boss 5 Elastic body 6, 7 Screw

Claims (4)

A portable electronic device having a box-shaped outer casing and a circuit board that is fixed to the outer casing only at a substantially rectangular outer peripheral portion, and the fixing portion is concentrated in a range of at least half of the entire plane. . 2. The portable electronic device according to claim 1, wherein the circuit board is fixed only in the vicinity of the two side surfaces of the box-shaped outer casing. 3. The portable electronic device according to claim 2, wherein the circuit board and the outer casing are in contact with each other through an elastic body except in the vicinity of the side surface of the outer casing. 3. The portable electronic device according to claim 2, wherein the circuit board is provided with a hole or notch for avoiding contact with a boss or the like of the outer casing except in the vicinity of a side surface of the outer casing.

Images