JPH0547502Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a mounting structure for a plate-shaped switch.

(Prior Art) In a mobile phone, as shown in FIG. 3, a numeric keypad and other various switches are provided on a handset 1, and the handset 1 is held to perform various operations. In addition, the handset 1 is required to be small and lightweight from the viewpoint of operability, and the various switches provided in the handset 1 are entirely integrated thin plate-like switches (membrane switches) 2. It is becoming more and more like this.

4 and 5 show a conventional mounting structure for this type of membrane switch 2.

In the structure shown in FIG. 4, a wireless section printed wiring board (wireless section board) 5 is screwed onto the inner wall surface 4 of the upper case 3 of the handset 1.
A control unit printed wiring board (main board) 9 is connected to the radio unit board 5 via connectors 6 and 7.
Various electronic components 10 are mounted between and the main board 9. On the other hand, the lower case 12 is formed with a recess 13 into which the membrane switch 2 fits, and the membrane switch 2 is attached to the bottom of the recess 13 and connected to the main board 9 via a flat cable 15. connected.

Furthermore, in the structure shown in FIG.
An opening 17 is formed in the lower case 12A of the membrane switch 2, and the membrane switch 2 is inserted into the stopper 20 with its operation surface 18 positioned in the opening 17.
and is fixed to the inner wall surface of the lower case 12A using screws 21.

However, in the structure shown in Fig. 4, the lower case 1
Since the recess 13 must be formed in the electronic component 2 mounted between the main board 9 and the lower case 12,
There was a problem in that the storage space for the handset 4 was reduced, and the handset 1 became larger accordingly. In this case, it is conceivable to reduce the thickness of the bottom wall 22 of the recess 13, but this is difficult in practice because it causes a sink mark. Also, upper case 3 and lower case 1
2, it is necessary to connect the main board 9 and the membrane switch 2 with the flat cable 15, which not only reduces the efficiency of the assembly work, but also requires the flat cable 15 to be longer, making it difficult to accommodate the electronic components 24. It was a hindrance to doing so.

On the other hand, in the structure shown in FIG. 5, it is necessary to provide the stopper 20 and the boss 22 for attaching it to the peripheral edge of the membrane switch 2.
The structure is similar in that the handset 1 is larger, and the structure shown in FIG. 4 is also that the flat cable 15 has to be made longer.

(Problems to be solved by the invention) As mentioned above, in the conventional switch mounting structure, the storage space for the electronic components mounted between the printed wiring board and the membrane switch was narrowed due to the mounting of the membrane switch. . Furthermore, when assembling the upper and lower cases that make up the housing of an electronic device, it is necessary to electrically connect the printed wiring board and the membrane switch, which not only makes assembly easier, but also requires the use of flat cables to connect the two. This required a longer length, which was an obstacle to storing electronic components.

The present invention has been developed in view of these conventional drawbacks, and it is possible to install a membrane switch without narrowing the storage space for the electronic components mounted between the printed wiring board and the membrane switch, and it also allows the mounting of the membrane switch without reducing the storage space for the electronic components mounted between the printed wiring board and the membrane switch. To provide a switch mounting structure that is easy to assemble and can minimize the length of a flat cable, etc. that electrically connects a printed wiring board and a membrane switch.

[Structure of the invention] (Means for solving the problem) The present invention provides a method for installing a printed wiring board installed in a housing of an electronic device, with an electronic component interposed between the printed wiring board and the printed wiring board. In the mounting structure for a plate-shaped switch that is electrically connected to the printed wiring board via a flat cable and is disposed in the housing with an operation surface exposed to the outside of the housing, An opening is formed in the casing, one end of the switch is attached to the other end of a spacer attached to the printed wiring board, and the operation surface is positioned in the opening from inside the casing. It's summery.

(Function) In the present invention, the plate-shaped switch (membrane switch) is attached to the printed wiring board via a spacer, so the printed wiring board and membrane are attached only to one of the upper and lower cases that make up the housing of the electronic device. A switch can be attached. Therefore, the upper and lower cases can be easily assembled, and the printed wiring board and membrane switch can be connected using a flat cable of the minimum necessary length. In addition, the spacer for attaching the membrane switch to the printed wiring board can be attached to the printed wiring board by selecting a position and shape that will not interfere with the various electronic components mounted on the printed wiring board. Large storage space for electronic components can be secured in the body.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 and 2.

In the figure, 1 is a handset, and the housing of the handset 1 is composed of an upper case 3B and a lower case 12B. On the inner wall surface 4 of the upper case 3B,
As in the conventional example, a wireless section printed wiring board (radio section board) 5 is screwed on, and a control section printed wiring board (main board) 9B is connected to this radio section board 5 via connectors 6 and 7. and this wireless unit board 5
Various electronic components 10 are mounted between the main board 9B and the main board 9B. In addition, on the lower case 12B, an operation surface 18 of a plate-shaped switch (membrane switch) 2 is provided.
An opening 30 is formed to expose the outside of the housing.

31 is a spacer for attaching the membrane switch 2 to the main board 9B at a predetermined distance.

As shown in FIG. 2, the spacer 31 is integrally formed with a flat plate part 32 to which the membrane switch 2 is attached, and a columnar attachment part 33 and a support part 34 described on the flat plate part 32. . Mounting part 33
A claw 35 is formed at the tip of the main board 9B.
By fitting the pawl 35 into the notch 36 formed in the spacer 31, the spacer 31 is attached to the main board 9B, and the tip of the support part 34 comes into contact with the main board 9B. In addition, the membrane switch 2 is
The back side 38 is attached to the flat plate part 32 with double-sided tape or the like.
is attached to the main board 9 through this spacer 31.
It can be attached to B. In this case, the spacer 31
The height of the electronic component 2 mounted on the main board 9B is the distance l between the main board 9B and the membrane switch 2.
4, and an escape hole 40 is bored in the flat plate part 32 to prevent tall electronic components from coming into contact with the flat plate part 32. ing. Further, the attachment part 33 is attached to the peripheral edge of the main board 9B, and the support part 3
4 selects a portion where the electronic component 24 is not mounted and brings it into contact with the main board 9B. Therefore, the spacer 31
can be attached to the main board 9B within the storage space for the electronic components 24 mounted on the main board 9B.

Since the membrane switch 2 is attached to the main board 9B via the spacer 31 as described above, the main board 9B and the membrane switch can be electrically connected in advance by the flat cable 15B or the like. Therefore, the flat cable 15B and the like need only have a minimum length that can connect the two, and will not interfere with the electronic component 24 mounted between the two. Further, the membrane switch 2 is attached to the upper case 3B together with the main board 9B.
Therefore, it is easy to assemble the upper and lower cases 3 and 12B, and by assembling both, the operating surface 18 is positioned in the opening 30. Furthermore, since the spacer 31 can be attached to the main board 9B within the mounting space for the electronic component 24, the original storage space for the electronic component 24 is not narrowed by attaching the membrane switch 2, and the spacer 31 can be attached to the main board 9B within the mounting space for the electronic component 24. Therefore, the handset 1 can be made much smaller than before. In this example, the flat plate portion 32 of the spacer 31 has an escape hole 40 formed therein, but the supporting portion 34 is not connected to the main substrate 9.
Since it is in contact with B, the operation surface 18 is pressed for operation.
Even if pressed, the membrane switch 2 will not bend.

[Effects of the invention] As explained above, in the switch mounting structure of the invention, the plate-shaped switch is attached via a spacer to a printed wiring board installed inside the housing of an electronic device, so that assembly of the housing is easy. can be easily carried out, and the length of flat cables, etc. that connect the printed wiring board and the switch can be minimized. Furthermore, the spacer itself can be installed within the storage space for electronic components mounted between the printed wiring board and the switch without interfering with the electronic components, allowing for the miniaturization of electronic device casings. be able to.

[Brief explanation of the drawing]

1 and 2 are views showing one embodiment of the present invention, and FIG. 1 is a sectional view taken along the line A-A in FIG.
The figure is an exploded perspective view illustrating the installation of the membrane switch. FIG. 3 is a perspective view of the handset. 4 and 5 are sectional views taken along the line A--A in FIG. 3, respectively, showing a conventional switch mounting structure. 1...Electronic equipment (handset), 2...Membrane switch, 3B...Upper case, 9B...Printed wiring board (main board), 12B...Lower case,
15B...Flat cable, 18...Operation surface,
30...opening, 31...spacer.

Claims (1)

[Scope of utility model registration request] A printed wiring board installed in a casing of an electrical device is placed opposite the printed wiring board with an electronic component interposed therebetween, and is electrically connected to the printed wiring board via a flat cable. In the mounting structure for a plate-shaped switch disposed in the housing with an operation surface exposed to the outside of the housing, an opening is formed in the housing, and one end of the switch is attached to the printed wiring board. A mounting structure for a switch, characterized in that the operating surface is mounted on the other end side of a spacer mounted on the housing, and the operating surface is positioned in the opening from inside the housing.