JP4622940B2 - Information processing device - Google Patents

Description

  The present invention relates to a portable information processing apparatus typified by a notebook personal computer or a pen PC, and more particularly to a housing structure having excellent surface strength when carried.

  In recent years, with the spread of mobile phones and wireless cards and the development of communication infrastructure such as hotspots where wireless LAN can be used, opportunities for portable use such as laptop computers have increased.

  A notebook personal computer that is used for mobile purposes is composed of a main board with a CPU, a main body with a keyboard for an input device, and a display unit with a display device such as a liquid crystal. The display unit is rotated by a hinge. It is configured to be freely attached. The main body of the notebook computer and the housing of the display unit are made of aluminum alloy, which has high rigidity as well as plastic processing and die casting, magnesium alloy die casting and thixo molding. ing.

  3 and 4 show an example of a conventional notebook personal computer. FIG. 3 is a view showing a cross section of the notebook personal computer with the display closed. In the figure, 5 is a main body part of the information processing apparatus, and 4 is a display part attached to the main body part 5 by a hinge so as to be opened and closed. In the display unit 4, the liquid crystal display device 1 and the inverter 6 are disposed between the rear housing 3 and the front housing 2. In the main body 5, a keyboard 9 is attached to a main body casing 7, a main board 10 is disposed between the main body upper casing 7 and the lower body casing 8, and a battery 11 is disposed on the hinge side to be detachable. Yes. In order to reduce the size, there is a method in which the inverter 6 is arranged so as to overlap the liquid crystal display device 1 as shown in FIG.

  When carrying such a notebook computer in a bag or carrying it by hand, an external force F1 as shown in FIGS. 3 and 4 may be applied to the center of the display, and the wall thickness is reduced at that time. The rear housing 3 is deformed, and the liquid crystal display device 1 is deformed by contact with the stored liquid crystal display device 1, further causing a problem that causes damage. Further, when the external force F2 is applied to the hinge side portion and the inverter 6 overlaps the liquid crystal display device 1 as shown in FIG. 4, not only the central portion of the liquid crystal display device 1, but also the substrate 20 of the liquid crystal display device 1. In addition, there is a problem of deformation or breakage of the backlight tube 21 and the inverter 6.

  As a technique for solving the problem of the case strength when the notebook personal computer is carried as described above, for example, there is Patent Literature 1. 1 (a) and 1 (b) of Patent Document 1 includes a display unit using a casing in which a magnesium alloy is formed by a die casting method and a convex raised portion is formed in a substantially rectangular central portion. A notebook computer is disclosed. Specifically, reference numeral 13 denotes a rear casing of the display unit 12, and a liquid crystal display device 15 is disposed between the rear casing 13 and the front casing 14. The rear housing 13 is provided with a raised portion 13b (step difference H1) of 1 to 3 mm from the flat portion 13a. According to this Patent Document 1, the rigidity is improved by providing a 1 to 3 mm raised portion 13b (step H1), and even when an external force is applied to the center of the back housing 13 as compared with the case where there is no raised portion 13b. The amount of deformation is reduced, and the average thickness T2 of the rear housing 13 can be reduced within an allowable range.

JP 2003-204174 A

  Due to the improvement of the portable use environment for notebook computers, the casings of notebook computers and the like are required to be rigid and to be thinned to the limit to further reduce weight. However, in FIG. 1 of Patent Document 1, etc., it is said that the main thickness T1 can be reduced to about 0.8 mm by injection molding of the magnesium alloy. However, when aiming at further thinning, for example, the magnesium alloy is formed by plastic working. In such a case, since the thickness can be reduced to about 0.5 mm, the shape of the back casing 13 as shown in FIG.

  An object of the present invention is to provide a portable information device such as a notebook personal computer having a shape of a rear casing that can sufficiently ensure rigidity even in a casing molded by plastic processing of a magnesium alloy.

  In order to solve the above problems, an information processing apparatus having a casing in which a rectangular plane is formed by a thin plate of magnesium alloy or the like according to the present invention is symmetrical to the center of the long side of the casing. And two first concave groove-shaped portions provided substantially parallel to the short side of the casing, and substantially parallel to the long side of the casing connected to the first concave groove-shaped section at a substantially right angle. The second concave groove shape portion is provided, thereby increasing the rigidity of the rectangular flat surface of the housing of the information processing apparatus.

  According to the present invention, since the amount of deformation when an external force is applied to the rear housing can be reduced, the thickness of the housing can be reduced, and further weight reduction of portable information devices such as notebook computers can be achieved. is there.

Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an external perspective view of a rear case of a display unit of a notebook PC according to an embodiment of the present invention. Here, the upper side of FIG. 1 is a display hinge part, and the lower side is an upper part of the display when the display is opened. FIG. 2 shows a longitudinal sectional view of FIG.

  A detailed configuration of a display unit of a notebook personal computer to which the present invention is applied will be described below with reference to FIGS. The display unit is composed of a rear case 22 formed by plastic processing of magnesium alloy, a front case 23 made of plastic, and a case of a wireless antenna cover 17 that can accommodate a wireless LAN antenna. A liquid crystal display device 18 and an inverter 19 are disposed between the rear housing 22 and the front housing 23.

  Here, the liquid crystal display device 18 and the back housing 22 are disposed with a gap so that the liquid crystal display device 18 is not pressed by deformation of the back housing 22 until the pressing of the back housing 22 becomes a predetermined pressure. .

  The rear housing has two concave groove shapes 22a that are substantially parallel to the short side, and is connected to one concave groove shape 22b that is substantially parallel to the long side. The inverter 19 is arranged in a quadrangle formed by the recessed groove shapes 22a and 22b and the outer hinge side long side. The recessed groove shapes 22a and 22b are, for example, 2 to 5 mm deep from the reference surface 22d. The depths of the recessed groove shapes 22a and 22b are not limited to this value, and the recessed groove shape 22a and the recessed groove shape 22b may have different depths.

  Further, the concave shape 22c is a surface lower than the rear housing reference surface 22d. By adopting such a shape, the bending rigidity in the short side direction is increased like the concave groove shape 22a, and the design is troublesome to make the entire notebook type personal computer of the embodiment thin.

  In the present embodiment, the reference surface 22d has an inclined shape that gradually increases from the wireless antenna cover 17 toward the hinge side. However, the reference surface 22d is included in the present invention as long as the reference surface 22d is flat or not extremely inclined.

  As described above, in the embodiment of the present invention, the groove shapes 22a and 22b are provided in the short side and long side directions of the rear housing. Thereby, since the bending rigidity of the housing in two directions can be increased, the load strength of the rear housing can be increased. The strength comparison with the shape disclosed in Patent Document 1 will be described later with reference to FIG.

  Next, the installation position of the concave groove shape 22b in FIG. 2 will be described. A notebook personal computer to which the present invention is applied is assumed to be carried while holding the hinge side of the apparatus as shown in FIG. For this reason, pressure is applied to the hinge side at the center of the rear case when carrying. In the present embodiment, the concave groove shape 22b is provided at a position of about 60 mm (L1) from the hinge side long side of the rear housing 22. Thereby, the case deformation | transformation of the long side direction by the press at the time of carrying is reduced. The dimension of the L1 is not limited to this, but the concave groove shape 22b is provided on the holding side when carried.

  Moreover, the concave groove shape 22b provided at a position of about 60 mm (L1) from the long side of the hinge of the rear housing 22 can be used as a finger hook as shown in FIG. Can also be expected.

  When a magnesium alloy is selected as the material for forming the casing of this embodiment, the casing can be formed by die casting or press forming. In general, in the die-cast manufacturing method, the pouring gate is set so as not to hinder the flow of the molten metal in order to flow the molten metal. In order to form the case shown in FIG. 1, a gate is set on the hinge side of the case or on the wireless antenna cover 17. In this case, the concave groove shape 22b in FIG. 1 becomes a factor that hinders the flow of molten metal. For this reason, it is desirable to provide a gate on the hinge side of the housing.

  When the case is formed by press forming, since there is no problem, the degree of freedom of the groove shape can be increased. In this case, if it is the depth of 2-5 mm of a present Example, a drawing process can be performed.

  Next, another back housing shape will be described with reference to FIG. 1 has the same configuration as that of the rear case, and the short side and long side concave groove shapes 22a and 22b of the rear case are different, and the arrangement location of the inverter 19 is different.

  The rear housing has two concave groove shapes 22a that are substantially parallel to the short side, and is connected to one concave groove shape 15b that is substantially parallel to the long side. The inverter 19 is disposed between the groove shape 22b and the outer hinge side long side and between the groove shape 22a. The groove shapes 22a and 22b are 2 to 4 mm deeper than the reference surface 22d. Although the concave shape 22c is lower than the back casing reference surface 22d, it has a design-like chamfer to make the entire information processing apparatus thin. Therefore, the presence or absence of the concave shape 22c affects the present invention. do not do.

  In the present embodiment, the reference surface 22d has an inclined shape that gradually increases from the wireless antenna cover 17 toward the hinge side. However, the reference surface 22d is included in the present invention as long as the reference surface 22d is a flat surface or is not extremely inclined.

  Also in this embodiment, the concave groove shape 22b of the first embodiment is provided at a position of about 60 mm (L1) from the long side of the hinge of the rear housing 22. As with the first embodiment shown in FIG. 5, this concave groove shape 22b is also effective against the external force F2 received by the hand during carrying, and as with the first embodiment shown in FIG. To make it easier to hold.

  Next, the rigidity of the rear housing having the shape shown in FIGS. 1 and 7 will be described with reference to FIGS. As shown in FIG. 8, the rigidity of the case was analyzed by analyzing the maximum amount of deflection and the maximum stress when applied to three locations of the rear case with an equally distributed load with an external force of 400 N having a diameter of 50 mm. FIG. 9 shows the analysis results when the rear casing is made of a magnesium alloy and the thickness (plate thickness) is 0.6 mm.

  According to this, since the maximum deflection amount of the rear housing in FIG. 1 of the embodiment and FIG. 7 of the embodiment is smaller than that of Patent Document 1 at all positions, it indicates that the rigidity is high.

  In the present embodiment described with reference to the drawings, the shape of the back casing of the display unit of the notebook personal computer has been described. However, the present invention is not limited to this, and the information processing apparatus in which a rectangular flat surface is formed by a thin plate. For example, the present invention can be applied to a bottom case of a main body of a notebook computer.

1 is an external perspective view of a display unit of an information processing apparatus in Example 1 of the present invention. It is sectional drawing of the display part of the information processing apparatus in Example 1 and Example 2 of this invention. It is sectional drawing (state which closed the display part) of the conventional notebook type PC. It is sectional drawing (arrangement where the inverter overlapped with the liquid crystal) of the conventional notebook type PC. It is a figure of the state which held the information processing apparatus in Example 1 of this invention by hand. It is a figure of the state which hold | maintained the information processing apparatus in Example 1 of this invention with a hand, and hung a finger | toe on the groove | channel. It is an external appearance perspective view of the display part of the information processing apparatus in Example 2 of this invention. It is a figure of the analysis conditions in Example 3 of this invention. It is a figure of the analysis result in Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device, 2 ... Front housing | casing, 3 ... Back housing | casing, 4 ... Display part,
5 ... Main body, 6 ... Inverter, 7 ... Upper housing, 8 ... Lower housing,
9 ... Keyboard, 10 ... Main board, 11 ... Battery,
17 ... Wireless antenna cover of embodiment, 18 ... Liquid crystal display device of embodiment,
19 ... Inverter of embodiment, 20 ... Substrate of liquid crystal display device,
21 ... Backlight tube of the liquid crystal display device, 22 ... Back housing of the embodiment,
22a ... concave groove shape (substantially parallel to short side), 22b ... concave groove shape (substantially parallel to long side),
22c: concave shape, 22d: reference surface, 23: front casing of the embodiment

Claims (3)

An information processing apparatus having a casing in which a rectangular plane is formed by a thin plate of magnesium alloy or the like, wherein the casing is
Two first groove-shaped portions provided symmetrically with respect to the center of the long side of the casing and substantially parallel to the short side of the casing;
Wherein provided between the two first groove-shaped portion of said first concatenating a substantially right angle to the groove-shaped portion, the provided substantially parallel to the housing length sides, wherein the first groove shape An information processing apparatus comprising a second groove-shaped part having a depth different from that of the part and integrally molded . The information processing apparatus according to claim 1,
The information processing apparatus includes a liquid crystal display unit and an inverter,
The bottom portions of the first and second groove-shaped portions are formed to have a gap with the liquid crystal display portion,
Of the quadrilateral formed by the first and second groove-shaped portions and the outer hinge side long side, the housing portion other than the first and second groove-shaped portions and the liquid crystal display portion An information processing apparatus, wherein the inverter is accommodated in a gap. The information processing apparatus according to claim 1,
The information processing apparatus includes a liquid crystal display unit and a hinge unit for rotatably mounting the liquid crystal display unit,
The information processing apparatus according to claim 2, wherein the second groove-shaped portion is disposed at a hold position when the hinge portion is carried from the center of the short side of the casing.

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