JP2014099962A - Portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breaking of wire in a portable terminal by moderating load on a flexible board.SOLUTION: A first circuit board inside a first enclosure 2 and a second circuit board outside the first enclosure 2 are connected with a flexible board 6. A waterproof grommet 11 fitted into a flexible board insertion hole 10 of the first enclosure 2 is provided for waterproof between the flexible board insertion hole 10 and the flexible board 6. The waterproof grommet 11 is provided with a cylindrical grommet body 12 adjoining the inner circumference of the flexible board insertion hole 10, and a flexible board holding part 13 in which the flexible board 6 is pressed in is provided continuous to a back-side end part of the grommet body 12. A thin-wall groove part 14 is provided between the flexible board holding part 13 and the back-side end part of the grommet body 12.

Description

  The present invention relates to a portable terminal having a flexible substrate connected to an electronic component outside a housing, and more particularly to a waterproof structure around a flexible insertion hole through which the flexible substrate is inserted.

  2. Description of the Related Art Conventionally, a portable terminal that waterproofs a flexible substrate with a solid grommet that is made of an elastic member such as resin or rubber and does not steal meat is known (for example, see Patent Document 1).

JP 2011-259081 A

  However, in the conventional portable terminal, since the flexible substrate is completely fixed by the solid grommet, when the flexible substrate moves, there is a problem that stress is concentrated on the fixed portion and may be damaged.

  This invention is made | formed in view of this point, The place made into the objective is to prevent a disconnection so that a load may not be applied to a flexible substrate.

  In order to achieve the above object, in the present invention, the flexibility of the flexible holder that holds the flexible substrate is increased.

Specifically, in the first invention,
A housing containing a circuit board;
A flexible substrate for connecting the circuit board and an electronic component outside the housing;
A waterproof grommet that fits into the flexible insertion hole of the housing and waterproofs between the flexible insertion hole and the flexible substrate,
The waterproof grommet is
A cylindrical grommet body that contacts the inner periphery of the flexible insertion hole;
A flexible holding part that is continuous with the back end of the grommet body and into which the flexible board is press-fitted,
A thin groove portion formed between the flexible holding portion and the rear end portion of the grommet body is provided.

  According to said structure, the softness | flexibility of the part holding a flexible substrate increases by making the thickness of the connection part of a grommet main body back side edge part and a flexible holding | maintenance part thinner than another part by a thin groove part. For this reason, even if the flexible substrate is pulled, the stress is less likely to concentrate around the flexible holding portion, and damage to the flexible substrate is prevented.

  As described above, according to the present invention, since the thin groove portion is formed between the flexible holding portion and the back end portion of the grommet body, it is possible to prevent disconnection without applying a load to the flexible substrate. .

FIG. 3 is an enlarged cross-sectional view taken along a line II in FIG. The closed state of the mobile telephone which concerns on embodiment of this invention is shown, (a) is a perspective view, (b) is a front view. FIG. 3 is an exploded perspective view of FIG. It is a perspective view which expands and shows a waterproof grommet and a flexible substrate. A waterproof grommet and a flexible substrate are shown enlarged, (a) is a front view, (b) is a Vb-Vb line sectional view of (a). It is a perspective view which expands and shows the waterproof grommet and flexible substrate which concern on a modification. The waterproof grommet and flexible substrate which concern on a modification are expanded and shown, (a) is a front view, (b) is the VIIb-VIIb sectional view taken on the line of (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 shows a closed state of a mobile phone as a mobile terminal according to an embodiment of the present invention, in which (a) is a perspective view and (b) is a front view. FIG. 1 is an enlarged cross-sectional view taken along line II in FIG. FIG. 3 is an exploded perspective view of FIG.

  In the mobile phone 1 according to the embodiment of the present invention, for example, a first housing 2 as a housing having a display unit and a second housing 3 having an operation unit can be folded and opened around a hinge portion 4. It is connected to. A first circuit board 5 (shown only in FIG. 3) for controlling the display unit and the like is built in the first housing 2. Although not shown, a second circuit board (electronic component outside the casing) that controls the entire mobile phone 1 is built in the second casing 3. The first circuit board 5 and the second circuit board are connected by a flexible substrate 6. The flexible substrate 6 passes through a through hole 4 a (shown only in FIG. 1) provided on the right side of the hinge portion 4. The back side of the first housing 2 is covered with a plate-like rear cover 2a. The back surface of the second housing 3 is covered with a back-side cabinet 3a.

  A rectangular flexible insertion hole 10 is opened at a location where the flexible substrate 6 is inserted in the first housing 2 so as to penetrate vertically. A waterproof grommet 11 that waterproofs the flexible substrate 6 is fitted into the flexible insertion hole 10.

  4 is an enlarged perspective view showing the waterproof grommet 11 and the flexible substrate 6, FIG. 5 is an enlarged view of the waterproof grommet 11 and the flexible substrate 6, FIG. 4A is a front view, and FIG. It is the Vb-Vb sectional view taken on the line a). The waterproof grommet 11 includes a cylindrical grommet main body 12 having a substantially rectangular frame shape in contact with the inner periphery of the flexible insertion hole 10. The grommet body 12 is made of an elastic body such as silicon rubber.

  A flexible holder 13 through which the flexible substrate 6 is inserted is integrally formed at the back end of the grommet body 12. The flexible holding portion 13 has a rectangular tube shape that is inserted so that the flexible substrate 6 is press-fitted into the center, and is thickened and reinforced on the connecting side with the back end of the grommet body 12. Yes. And between the flexible holding | maintenance part 13 and the grommet main body 12 back | inner side edge part, the thin groove part 14 is cyclically | annularly formed in an inner surface side and an outer surface side, and thickness is thinner than another area | region. Since the flexible substrate 6 is press-fitted into the flexible holding portion 13, when the flexible substrate 6 is pulled, the thin portion around the thin groove portion 14 is first deformed. In addition, you may provide this thin groove part 14 only in the inner surface side or outer surface side of the connection part of the flexible holding part 13 and the back side edge part of the grommet main body 12. FIG.

  A frame-shaped reinforcing material 15 is provided integrally with the grommet main body 12 at a portion corresponding to the inner periphery of the flexible insertion hole 10 of the grommet main body 12. This reinforcing material is made of, for example, polycarbonate resin or metal, and is integrally formed with silicon rubber by, for example, insert molding.

-Effect of the embodiment-
(1) According to this embodiment, the flexible substrate 6 is held by providing the thin groove portion 14 between the back end portion of the grommet body 12 and the flexible holding portion 13 and making the thickness thinner than other portions. Increases the flexibility of the part. For this reason, for example, even when the flexible substrate 6 is pulled when the first housing 2 and the second housing 3 are folded and opened, the stress is less likely to concentrate around the flexible holding portion 13, and the flexible substrate 6. Damage is prevented.

  (2) In the present embodiment, a frame-shaped reinforcing material 15 is provided integrally with the grommet body 12 at a portion corresponding to the inner periphery of the flexible insertion hole 10 of the grommet body 12. Since the frame-shaped reinforcing material 15 reinforces the portion corresponding to the inner periphery of the flexible insertion hole 10 of the grommet main body 12, waterproofness can be ensured while the grommet main body 12 is hollow. Since the reinforcing material 15 is integrally formed, the number of parts is reduced and assembly is easy.

  Therefore, according to the mobile phone 1 according to the present embodiment, the thin groove portion 14 is formed between the flexible holding portion 13 and the back end portion of the grommet main body 12, thereby disconnecting the flexible substrate 6 so that no load is applied. Can be prevented.

-Modification-
FIG. 6 is an enlarged perspective view showing the waterproof grommet 111 and the flexible substrate 6 according to the modification of the embodiment of the present invention. FIG. 7 is an enlarged view of the waterproof grommet 111 and the flexible substrate 6 according to the modification. (A) is a front view, (b) is a sectional view taken along line VIIb-VIIb in (a). This modification differs from the above embodiment in that the metal reinforcing material 115 is different. In addition, the same code | symbol is attached | subjected about the same part as FIGS. 1-5, and the detailed description is abbreviate | omitted.

  That is, a frame-shaped metal reinforcing material 115 is fitted and bonded to a portion corresponding to the inner periphery of the flexible insertion hole 10 of the grommet body 112 in the waterproof grommet 111 of this modification. At least a pair of protrusions 117 are formed on the inner surface of the metal reinforcing member 15 so as to sandwich the flexible substrate 6 along the direction in which the flexible substrate 6 extends. In this modification, two pairs of protrusions 117 are provided so as to sandwich the both ends of the flexible substrate 6 in the width direction with a predetermined gap. In this modification, the metal reinforcing material 115 is provided separately from the grommet main body 112, so that the protrusion 117 can be provided. In the integral molding as in the above embodiment, it is difficult to provide the protrusion 117 due to the restriction of die cutting. In addition, you may provide only one pair of this protrusion 117 so that the width direction center of the flexible substrate 6 may be pinched | interposed.

  By providing the protrusion 117, when the flexible substrate 6 tries to bend in the thickness direction, the flexible holding portion 13 covering the flexible substrate 6 abuts the protrusion 117 so that the deformation is prevented. It has become.

-Effect of modification-
(3) Since the metal reinforcing material 115 is made of metal, it is easy to maintain rigidity even if it is thin. Further, since the protrusion 117 can suppress deformation in the thickness direction of the flexible holding portion 13, the flexibility of the flexible holding portion 13 can be further enhanced by the thin groove portion 14.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above embodiment, the waterproof grommets 11 and 111 are provided only on the first housing 2 side, but may be provided on the second housing 3 side. The first casing 2 and the second casing 3 do not have to be connected by the hinge portion 4, and the first casing and the second casing can be slidably connected. Good. Further, the electronic component outside the housing may not be the second circuit board in the second housing, but may be another electronic component.

  In the above embodiment, the mobile terminal is the mobile phone 1, but it is a PHS (Personal Handy-phone System), a PDA (Personal Digital Assistant), a smartphone, a personal computer, a mobile tool, an electronic dictionary, a calculator, a game machine, and the like. Also good.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use. The technical features described in each embodiment can be combined with each other, and a new technical feature can be formed by combining them.

1 Mobile phone (mobile terminal)
2 First housing (housing)
2a Rear cover 3 Second housing (outside housing)
3a Rear side cabinet 4 Hinge part 4a Through hole 5 First circuit board (circuit board)
6 Flexible substrate 10 Flexible insertion hole 11 Waterproof grommet 12 Grommet body 13 Flexible holding portion 14 Thin groove portion 15 Reinforcing material 111 Waterproof grommet 112 Grommet body 115 Metal reinforcing material 117 Projection

Claims (3)

A housing containing a circuit board;
A flexible substrate for connecting the circuit board and an electronic component outside the housing;
A waterproof grommet that fits into the flexible insertion hole of the housing and waterproofs between the flexible insertion hole and the flexible substrate,
The waterproof grommet is
A cylindrical grommet body that contacts the inner periphery of the flexible insertion hole;
A flexible holding part that is continuous with the back end of the grommet body and into which the flexible board is press-fitted,
A portable terminal comprising: a thin groove portion formed between the flexible holding portion and the rear end portion of the grommet body. The mobile terminal according to claim 1,
A portable terminal, wherein a frame-shaped reinforcing material is provided integrally with the grommet body at a portion corresponding to the inner periphery of the flexible insertion hole of the grommet body. The mobile terminal according to claim 1,
A frame-shaped metal reinforcing material is fitted into a portion corresponding to the inner periphery of the flexible insertion hole of the grommet body,
A portable terminal, wherein at least a pair of protrusions are formed on an inner surface of the metal reinforcing material so as to sandwich the flexible substrate along a direction in which the flexible substrate extends.

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