JP2006033202A - Personal digital assistant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a personal digital assistant with a simple structure capable of maintaining required waterproof performance even when a whole case is distorted or subjected to like processes. <P>SOLUTION: The personal digital assistant includes the case formed by fitting and connecting upper and lower covers 1, 2 via a packing 3 to each other, a packing mount step part 5 with a rising wall 4 in parallel with the fitting direction of the upper and lower covers 1, 2 is formed to either of the covers, and a packing pressing wall 6 juxtaposing the rising wall 4 is formed to the other cover. Further, the packing 3 is wound on the packing mount step part 5 in a way of being vertically movable and the packing pressing wall 6 provides a prescribed bent to the packing 3, and the height of the rising wall 4 is selected to have an excess height higher than a gap caused between the upper and lower covers 1, 2 on the occurrence of deformation of the case. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a portable information terminal device.

A portable information terminal device described in Patent Document 1 is known as a portable information terminal device in which a gasket is interposed in the connecting portion of the upper and lower covers to ensure waterproofness inside the case. In this conventional example, a stepped portion is formed on the upper and lower covers so as to be sandwiched between the stepped portions.
Utility Model Registration No. 2523880

  However, in the above-described conventional example, the packing is surrounded by the same cover with the two adjacent surfaces being surrounded, so that the entire circumference of the case is surrounded. There is a problem that it is difficult to ensure and waterproof performance is not exhibited.

  The present invention has been made to eliminate the above drawbacks, and is a portable information terminal device that has a simple structure and can maintain the required waterproof performance even when distortion of the entire case occurs. For the purpose of provision.

  The case of the portable information terminal device is formed by connecting upper and lower covers 1 and 2 via a packing 3. One of the upper and lower covers 1 and 2 has a packing mounting step 5 and the other has a packing pressing wall 6. It is formed. The packing 3 is wound around the rising wall 4 of the packing mounting step 5, and a predetermined crushing amount is given by the packing pressing wall 6 to ensure sealing performance.

  In the present invention in which the packing 3 is wound around the packing mounting step portion 5 so as to be movable up and down, and the height of the rising wall 4 is formed to be longer than the generated gap between the upper and lower covers 1 and 2 when the case is deformed. For example, when a torsional or bending force is applied to the entire case and a gap is generated between the upper and lower covers 1 and 2, the packing 3 follows the rising wall 4 following the deviation of the boundary between the upper and lower covers 1 and 2. Can move. As shown in FIG. 2, since the rising wall 4 of the packing mounting step 5 is parallel to the fitting direction, the packing 3 moves up and down along the rising wall 4, that is, moves in the fitting direction of the upper and lower cases. However, as shown by a solid line and a chain line in FIG. 2B, the relative positional relationship between the packing 3 and the packing pressing wall 6 is maintained substantially the same. As a result, since the crushing amount with respect to the packing 3 is maintained at the initial set value, the sealing performance is not deteriorated, and the waterproof performance is prevented from being deteriorated due to the twisting of the main body.

  Although an O-ring having a circular cross section can be used for the packing 3, if a D-ring having a D-shaped cross section is used, even if the main body is twisted, the pressure contact area with respect to the rising wall 4 of the planar portion 3 a Therefore, the kinking of the D ring does not occur. As a result, stable sealing performance is exhibited even in various deformation modes for the main body. Further, when the main body is deformed, grease or the like can be applied to the contact portion so that the packing 3 is preferentially slipped at the contact portion with the rising wall 4 prior to the contact portion with the packing pressing wall 6. is there.

  According to the present invention, the required waterproof performance can be maintained even if the structure is simple and the entire case is distorted.

  FIG. 1 shows an embodiment of the present invention configured as a mobile phone. The mobile phone is formed by connecting the movable side body 10 to the fixed side body 9 so as to be foldable. An antenna 10a is mounted on the movable main body 10, and a liquid crystal display unit 10b and a speaker 10c are arranged at positions that appear in the front in the usage posture shown in FIG.

  FIG. 2 shows a case of the fixed-side main body 9. The case is connected by an appropriate fastening means (not shown) such as a screw so that the upper cover 1 and the lower cover 2 overlap each other. Reference numeral 5 denotes a packing mounting step formed on the entire outer periphery of the lower cover 2, a rising wall 4 standing in the vertical direction, and a horizontal lower support from the base end of the rising wall 4 toward the outer peripheral edge. It is formed by extending the surface 5a.

  3 is a packing, and in this embodiment, a so-called D-ring having a D-shaped cross section is used. The D-ring 3 is wound in a state where the flat surface portion 3 a is in sliding contact with the rising wall 4 of the packing mounting step portion 5.

  Reference numeral 6 denotes a packing pressing wall, which is formed around the outer peripheral edge of the upper cover 1. The packing pressing wall 6 is gently inclined so as to gradually open outward as it goes downward. When the packing pressing wall 6 is superposed on the lower cover 2, the D-ring 3 may be crushed and deformed from the outside to the inside. It is formed as possible.

  The dimensions of the packing pressing wall 6 and the like are determined as follows so that a predetermined crushing deformation is given to the D-ring 3 even when the upper cover 1 is attached and when deformation such as torsion is applied to the case. Is done.

  As shown in FIG. 2B, first, the height (H) of the rising wall 4 is the height of the upper and lower covers 1 and 2 when the case is deformed such as torsion in the state where the upper and lower covers 1 and 2 are assembled. The generated gap (δ) at the boundary is set to a size that can be absorbed. The generated gap is obtained by an experiment or simulation with an actual machine.

That is, when the curvature of the D ring 3 is (r), the height of the flat surface portion 3a of the D ring 3 is 2r.
H> 2r + δ
Is set to be

  As a result, the above-described deformation occurs in the case, and even if the D ring 3 moves following the contact surface with the rising wall 4 as a sliding surface, the D ring 3 may fall off the rising wall 4. It is surely prevented.

Furthermore, as shown in FIG. 3A, the radius (r) of the curvature portion of the D ring 3 and the D ring so that the D ring 3 can exhibit a predetermined sealing performance even if the case is deformed. 3 between the recommended crushing amount (x) for exerting the desired sealing performance and the contact width (y) by the packing pressing wall 6, the inclination angle of the packing pressing wall 6 is (θ),
r ² = y ² + {(r−x) + y × tan θ} ²
Is established.

  However, as shown in the figure, the contact width (y) is a region where the desired sealing performance can be exhibited without excessive crushing amount (x), that is, a range below the top of the curvature portion of the D ring 3. Point.

Therefore, the radius (r) of the curvature portion of the D ring 3 used is

To be satisfied.
Further, between the crushing amount (x), the contact width (y), and the radius (r) of the curvature portion of the D ring 3, as shown in FIG.
r ² = y ² + L ²
The crushing amount (x) is
x = r−L + y × tan θ
Because of the relationship
The crushing amount (x) is
x = r− (r ² −y ² ) ^1/2 + y × tan θ
Is set to satisfy.

FIG. 4 shows a second embodiment of the present invention. In the description of this embodiment, components that are substantially the same as those of the above-described embodiment are denoted by the same reference numerals in the drawing, and description thereof is omitted.
In this embodiment, a groove 7 is recessed in the lower support surface 5a of the packing mounting step 5 over the entire circumference. The groove 7 is formed outside the contact surface of the lower support surface 5a with the bottom wall of the D ring 3, and prevents the water that has entered from the boundary between the upper and lower covers 1 and 2 from contacting the D ring 3.

  The groove 7 is opened to the outside of the joint surface through the draining groove 8, and the water in the groove 7 is quickly discharged to the outside of the case.

1 is an overall perspective view showing a mobile phone to which the present invention is applied. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows this invention, (a) is sectional drawing which shows the junction part of an upper and lower cover, (b) is a principal part expanded sectional view which shows the clearance gap generation by case twist etc. It is explanatory drawing which shows the determination method of packing specifications. It is a figure which shows the 2nd Embodiment of this invention, (a) is a principal part perspective view, (b) is a top view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper cover 2 Lower cover 3 Packing 4 Standing wall 5 Packing installation step part 6 Packing press wall 7 Groove 8 Water drain groove

Claims (5)

A portable information terminal device having a case in which upper and lower covers are fitted and connected with packing interposed therebetween,
In either one of the covers, a packing mounting step portion having a rising wall parallel to the fitting direction of the upper and lower covers is formed,
The other cover is provided with a packing pressing wall facing the rising wall,
And the packing is wound around the packing mounting step portion so as to be movable in the vertical direction, and given a predetermined deflection by the packing pressing wall,
A portable information terminal device in which the height of the rising wall is longer than the gap generated between the upper and lower covers when the case is deformed. The packing is a D-ring having a D-shaped cross section;
The portable information terminal device according to claim 1, wherein a gap between the rising wall of the packing mounting step and the packing pressing wall gradually becomes smaller in the fitting / detaching direction of the upper and lower covers. The portable information terminal device according to claim 1 or 2, wherein the arc portion radius of the packing is determined on the basis of a recommended crush amount and securing of an effective contact width when the case is deformed. The portable information terminal device according to claim 1, 2 or 3, wherein a groove surrounding a contact portion with the packing is formed on a packing lower support surface of the packing mounting step. The portable information terminal device according to claim 4, further comprising a draining groove communicating with the groove and opening outside the case.

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