JP2019067891A - Board mounting structure - Google Patents

Abstract

To provide a board mounting structure allows a board to be easily attached to a housing of an electronic device without by a waterproof function being impaired pressing of a waterproof member by equal pressing force even when there are individual differences in the dimensions of the waterproof components.SOLUTION: A board mounting structure 1 to an electronic device 10 includes a lower case 5 of the electronic device, a first substrate 4 attached to the lower case, and a waterproof component 6 having a waterproof member 6a mounted on a first substrate and inserted into a through hole 5a of the lower case. The lower case includes a locking wall 5b for receiving repulsive force of the waterproof member via the first substrate and a rib 5c engaged with the first substrate, and the first substrate includes a pressing end face 4a for pressing the locking wall in a one-side area 41 of the peripheral side opposite to the through hole of the lower case and a notch 4b having a width larger than the diameter of the rib and engaged with the rib in an other-side area 42 of the peripheral edge for positioning.SELECTED DRAWING: Figure 1

Description

The present invention relates to a mounting structure of a substrate to an electronic device, and more particularly to a mounting structure for mounting a substrate on which an electronic component requiring waterproofing is mounted to the electronic device.

DESCRIPTION OF RELATED ART Conventionally, the attachment structure which attaches the board | substrate with which the electronic component which has a waterproof structure was mounted to the housing | casing of an electronic device is known (for example, refer patent document 1). Patent document 1 mounts a waterproof connector on a flexible substrate as a waterproof connector structure which can temporarily fix a connector without using a holder, and when the flexible substrate is attached to a housing of an electronic device, the housing is a waterproof connector This invention discloses an invention which is easily attached without impairing the waterproof function by inserting into the mounting hole of the above and pressing the regulation parts on both sides of the flexible substrate against the opening side of the casing.

However, the waterproof members and flexible substrates provided in the waterproof connector usually have individual differences that occur in the manufacturing process, and generally have slightly different dimensions. Therefore, there is a problem that the waterproof member may not be pressed by an even pressing force depending on the individual and the waterproof function may not be sufficiently performed if completely pressed by the restricting portion.

Patent No. 6088958

The present invention has been made in view of the above problems, and even if there are individual differences in the dimensions of the waterproof part having the waterproof member, the waterproof member is pressed with an equal pressing force and the waterproof function is not impaired.
In addition, it is an object of the present invention to provide a mounting structure of a substrate in which the substrate can be easily attached to the housing of the electronic device.

In order to solve the above-mentioned subject, the present invention is grasped by the following modes.
(1) An aspect according to the present invention is an attachment structure of a substrate to an electronic device, which is a lower case of the electronic device, a first substrate attached to the lower case, and the first substrate mounted on the first substrate A waterproof component having a waterproof member fitted into the through hole, and a locking wall for receiving the repulsive force of the waterproof member via the first substrate, and a rib engaged with the first substrate , And the first substrate has a pressing end face for pressing the locking wall in one region of the peripheral side opposite to the through hole of the lower case, and a width larger than the diameter of the rib. And a notch engaging with and positioning the rib in the other side region of the peripheral edge.

(2) In the configuration described in (1), the waterproof component is pressed from above by the second substrate in a state where the waterproof member is inserted into the through hole and the first substrate is temporarily fixed to the lower case. Be done.

(3) In the configuration described in (1) or (2), the waterproof component is an earphone jack, and the first substrate is an earphone jack substrate.

According to the present invention, even if the waterproof parts having the waterproof members have individual differences in dimensions, the housing of the electronic device can be easily without the waterproof members being pressed by the equal pressing force and the waterproof function being impaired. Can provide a mounting structure of the substrate on which the substrate can be mounted.

It is a perspective view which disassembles and shows an example of the electronic device which applied the attachment structure of the substrate concerning an embodiment of the present invention. It is a top view which expands and shows the attachment structure of the board | substrate of FIG. 1, Comprising: (a) expands the whole attachment structure, (b) expands further the range B of (a), and shows it, respectively. It is sectional drawing which expands and shows the AA line cross section of Fig.2 (a). It is a perspective view which expands and shows the attachment structure of the board | substrate of FIG. 2 (a).

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the respective drawings, the same reference numerals denote the same or corresponding parts. Further, the present invention is not limited to these embodiments as is apparent from the following description, and various modifications can be made by those skilled in the art within the scope of the invention.

(Whole structure of electronic equipment)
First, an electronic device provided with the substrate attachment structure 1 according to the present embodiment will be described. Although the case where the electronic device 10 is a cordless handset is described below, the present invention is not limited to this. The electronic device 10 may be, for example, a smartphone, a mobile phone, a tablet terminal, a music player, a game machine, or the like.

The electronic device 10 includes an upper case 2, a second substrate 3, a first substrate 4, and a lower case 5. The upper case 2 is provided with various buttons 2a necessary for operation, a liquid crystal screen 2b, and the like. The second substrate 3 is provided with a circuit (not shown) necessary for transmission and reception. The waterproof component 6 and the inter-substrate connector 7 are mounted on the first substrate 4. In the lower case 5, the first
In addition to the substrate 4 and the second substrate 3, a structure for housing a battery, various electronic components, and the like is provided. The first substrate 4 is a substrate on which the waterproof structure is provided in the mounting structure 1 of the substrate according to the present embodiment, and the second substrate 3 is a main substrate having a circuit that exhibits the function of the electronic device 10.

(Mounting structure of board)
The mounting structure 1 of the substrate is composed of the lower case 5, the first substrate 4 attached to the lower case 5, and the waterproof component 6 mounted on the first substrate 4 among the above elements.

In the lower case 5, a through hole 5 a for inserting the waterproof component 6 is provided on the wall surface 51 thereof. The through hole 5a has a diameter increasing in a stepwise manner from the outer side to the inner side of the lower case 5 in a sectional view as described later in detail. Inside the through hole 5a of the lower case 5, as will be described later, a locking wall 5b for receiving the repulsive force of the waterproof member 6a of the waterproof component 6 through the first substrate 4 and a rib engaged with the first substrate 4 5c is provided.

The first substrate 4 includes a waterproof part 6, an inter-board connector 7 and a circuit (not shown) related to the board
Is mounted. FIG. 1 shows the case where the waterproof part 6 is an earphone jack,
In that case, the circuit not shown becomes an earphone jack circuit. As waterproof part 6,
Not limited to the earphone jack, other than that, for example, mini USB terminal, U
Various connectors such as SB terminals can be employed.

The first substrate 4 has one side region 41 of the peripheral edge on the opposite side when viewed from the through hole 5 a of the lower case 5,
It also includes the other side region 42 of the periphery. The one side area 41 is the side on which the inter-board connector 7 is mounted, and the other side area 42 is the side on which the waterproof component 6 is mounted. In addition, although the aspect which one side area | region 41 protrudes inside the lower case 5 rather than the other side area | region 42 is illustrated here, the shape of the 1st board | substrate 4 is not restricted to what was shown in figure.

The first substrate 4 has a pressing end surface 4 a for pressing the locking wall 5 b of the lower case 5 in the one side region 41 where the inter-substrate connector 7 is mounted. In addition, the first substrate 4 has a notch 4 b in the other side area 42 where the waterproof component 6 is mounted, which engages with the rib 5 c of the lower case 5 for positioning. The notch 4b is formed in a width slightly larger than the diameter of the rib 5c.

The waterproof component 6 has a projecting portion 6 b inserted into the through hole 5 a of the lower case 5 and a base portion 6 c mounted on the first substrate 4, and between the projecting portion 6 b and the base portion 6 c A waterproof member 6a is provided. As the waterproof member 6a, an O-ring is suitably used, and the material thereof exhibits a waterproof function out of various silicone rubbers and resins, and is required for the mounting structure 1 of the substrate according to the present embodiment. The one having the necessary and sufficient elasticity may be selected in consideration of the repulsive force.

Under the configuration as described above, FIG. 2A shows the state in which the first substrate 4 is attached to the lower case 5 in a plan view. The protrusion 6b of the waterproof component 6 mounted on the first substrate 4 is inserted into the through hole 5a of the lower case 5, and the waterproof member 6a is located inside the through hole 5a. The pressing end face 4 a of the one side area 41 of the first substrate 4 presses the locking wall 5 b of the lower case 5, and the notch 4 b of the other side area 42 engages with the rib 5 c of the lower case 5.

As described above, the notch 4b is formed to have a width slightly larger than the diameter of the rib 5c, as shown in FIG. 2 (b) with the region B of FIG. 2 (a) enlarged. I have a "play" against. Thereby, the individual differences in the dimensions of the waterproof component 6 are absorbed by the "play", and the positioning is automatically adjusted so that the waterproof member 6a is uniformly pressed against the through hole 5a, and temporarily fixed in a stable state It will be done.

The configuration of the waterproof component 6 and the through hole 5a will be further described with reference to FIG. Figure 3 shows
The AA line cross section of (a) is shown. As described above, the diameter of the through hole 5a of the lower case 5 is increased stepwise toward the inside, and as shown in FIG. 3, the outer opening 5a1 having a relatively small diameter.
And an inner opening 5a2 having a relatively large diameter.

On the other hand, as described above, the waterproof component 6 mounted on the first substrate 4 has the protrusion 6 b inserted into the through hole 5 a and the base portion 6 c mounted on the first substrate 4. A waterproof member 6a is provided between the projecting portion 6b and the base portion 6c. More specifically, as shown in FIG. 3, the waterproof member 6a is fitted between the two flange portions 6d1 and 6d2, and the waterproof member 6a is
The diameter of the diameter is larger than the diameter of the flanges 6d1 and 6d2. The upper surface of the waterproof part 6 is
It is pressed by the second substrate 3 (see FIG. 1).

The diameter of the protrusion 6b of the waterproof component 6 substantially corresponds to the diameter of the outer opening 5a1 of the through hole 5a, and the diameters of the flanges 6d1 and 6d2 are larger than the diameter of the outer opening 5a1 of the through hole 5a,
The diameter is smaller than the diameter of the inner opening 5a2. The diameter of the waterproof member 6a is larger than the diameter of the inner opening 5a2. Thereby, the projecting portion 6 b of the waterproof component 6 is the through hole 5 of the lower case 5.
When it is inserted into a, the outer flange 6d1 is engaged with the boundary between the outer opening 5a1 and the inner opening 5a2, and the waterproof member 6a presses the inner wall surface of the inner opening 5a2. Then, as shown by the white arrow Y1, a repulsive force toward the inside of the lower case 5 is generated in the waterproof component 6.

This repulsive force is processed as shown in FIG. First, the first substrate 4 is automatically adjusted in the X-X direction (the width direction of the lower case 5) and the Z-Z direction (the thickness direction of the lower case 5) by the repulsion of the waterproof member 6a of the waterproof component 6, It is temporarily fixed in a state where it is positioned at the center to 5a. In this state, in the YY direction (longitudinal direction of lower case 5), waterproof component 6 and thus first substrate 4 are pushed back to the inside of lower case 5 by repulsion of prevention member 6a as shown by white arrow Y1. .

Here, when the upper surface of the base portion 6c of the waterproof member 6 is pushed in, as described above, the locking wall of the lower case 5 so that the pressing end surface 4a of the one end region 41 of the first substrate 4 exceeds the repulsive force of the waterproof member 6a. The notch 4b of the other end region is engaged with the rib 5c of the lower case 5 by pressing 5b, and the YY direction is fixed by the stress shown by the outlined arrows Y2 and Y3 respectively. In addition, when the second substrate 3 presses the waterproof component 6, the first substrate 4 can be moved along the ZZ of the electronic device 10.
It is fixed in the direction.

As described above, the notch 4b is formed to have a width slightly larger than the diameter of the rib 5c. Thereby, even if there are individual differences in the dimensions of the through hole 5a, the waterproof member 6a, the waterproof component 6, and / or the first substrate 4, the individual differences are absorbed by the gap between the rib 5c and the notch 4b. Thus, the repelling force of the waterproofing member 6a of the waterproofing part 6 automatically adjusts the waterproofing member 6a to a state in which the waterproofing member 6a is uniformly pressed, and is fixed in a stable state. With such a structure, the waterproof component 6 can be reliably waterproofed.

(Effect of the embodiment)
Since it is set as the above structures, the attachment structure 1 of the board | substrate to the electronic device which concerns on this embodiment has the following effects.
(1) Even when there is an individual difference in size in the waterproof component 6a (electronic component) having a waterproof function mounted on the first substrate 4, the first substrate 4 is temporarily fixed with play and waterproof Since the complete positioning is achieved by the repulsive force of the member 6a, the waterproof member 6a can be uniformly pressed, and the first substrate 4 can be attached to the lower case 5 easily and reliably.
(2) The first substrate 4 is fixed by utilizing the repulsive force of the waterproof member 6a, so that a fixing member such as a screw is not necessary, and the electronic device 10 can be miniaturized.
(3) Furthermore, when the first substrate 4 is attached to the electronic device 10, the second substrate 3 is a waterproof component 6.
By pressing the first substrate 4, the first substrate 4 can be fixed in the thickness direction of the electronic device 10.
(4) Furthermore, when the waterproof part 6 is an earphone jack, an effective capless waterproof can be given to the earphone jack.

As mentioned above, although embodiment was described, this invention is not limited to a specific embodiment, What variously changed is included, This is a claim for those skilled in the art. It is clear from the description of the range.

DESCRIPTION OF SYMBOLS 1 ... Mounting structure of substrate 2 ... Upper case 2a ... Button, 2b ... Liquid crystal screen 3 ... 2nd substrate 4 ... 1st substrate 41 ... Peripheral edge on one end side 42: Peripheral edge on the other end side 4a ... Pressed end face, 4b ... Notch 5 ... Lower case 5a ... Through hole, 5a 1 ... Outside opening, 5a 2 ... Inside opening 5b ... Locking wall, 5c ... Rib 6 ... Waterproofing part 6a ... Waterproofing member, 6b ... Projection part, 6c ... Base part, 6d 1 ... outside flange, 6d2 ...
Inner flange 7 ... Board to board connector 10 ... Electronic equipment (cordless telephone handset)

Claims (3)

Mounting structure of the substrate to the electronic device,
A lower case of the electronic device;
A first substrate attached to the lower case;
A waterproof component mounted on the first substrate and having a waterproof member fitted into the through hole of the lower case;
The lower case has a locking wall for receiving the repulsive force of the waterproof member via the first substrate, and a rib engaged with the first substrate.
The first substrate has a pressing end surface for pressing the locking wall in one region of the peripheral side opposite to the through hole of the lower case, and a width larger than the diameter of the rib, and the other of the peripheral side And a notch for engaging and positioning the rib in the side area. The waterproof component is pressed from above by the second substrate in a state where the waterproof member is inserted into the through hole and the first substrate is temporarily fixed to the lower case.
Mounting structure of the substrate described in. The substrate mounting structure according to claim 1 or 2, wherein the waterproof part is an earphone jack, and the first substrate is an earphone jack substrate.

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