JP2545233Y2 - Key input device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a key input device.

[Prior art and its problems]

2. Description of the Related Art As a key input device of an electronic device, there is a key input device including a touch panel switch or the like in which a key operation unit is flat and a key input is performed by a light touch operation.

FIG. 7 is an exploded perspective view of the conventional panel switch 100. FIG.

The panel switch 100 is composed of two rectangular transparent film substrates 102 and 103, and a plurality of conductive transparent electrodes 10
2a are formed, and a plurality of lead wirings 102b are formed at one end of the transparent film substrate 102 (the seventh line) from the end of the transparent electrode 102a.
It is formed toward the connecting portion 102d of the protruding portion 102c provided on the near side (in the drawing).

In addition, the protruding portion 102c has a connecting portion separate from the connecting portion 102d.
102f is formed.

A plurality of transparent electrodes 103a are formed on the upper surface of the lower transparent film substrate 103, and the transparent electrodes 103a are arranged at positions intersecting the transparent electrodes 102a of the transparent film substrate 102.

Similarly, at the end of the transparent electrode 103a, a lead wiring 103b is drawn to the end of the substrate 103 to form a connection portion 103d.

The connecting portion 102f of the transparent film substrate 102 and the connecting portion 103d of the transparent film substrate 103 are electrically connected via an anisotropic conductive rubber 104.

Further, as shown in a sectional view of a main part of the panel switch 100 in FIG.
Are provided between the transparent film substrate 102 and the transparent film substrate.
103 is arranged at a fixed interval. Further, a transparent hard coating layer 106 for preventing scratches is formed on the upper surface of the transparent film substrate 102 and the lower surface of the transparent film substrate 103.

Below the panel switch 100, a liquid crystal display 107 for displaying characters and numerical values assigned to individual keys is arranged. The area 107a of the liquid crystal display 107 shows a display area of characters and numerals, and for example, a key display by the liquid crystal display 107 can be seen through the transparent electrodes 102a and 103a of the panel switch 100.
By operating the portion where "5" is displayed, a numerical value "5" is input.

However, in the above-described conventional configuration, there is a drawback that a switch input is performed even with a slight touch because the film substrates 102 and 103 of the panel switch 100 are provided very close to each other. Since the panel switch 100 is arranged at a position where a touch input can be made from the outside of the device case, the panel switch 100 is easily affected by static electricity. (LSI) and destroyed the LSI.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and has as its object to provide a key input device capable of preventing noise such as static electricity from the outside and preventing destruction of an LSI or the like.

[Points of the invention]

According to this invention, in order to achieve the above-mentioned object, a shield electrode is formed on one transparent substrate of a panel switch disposed on a glass upper surface of a case so as to surround a switch electrode, and the panel switch is mounted on the glass upper surface. The gist is that the bezel is configured to cover the periphery of the Pal switch.

〔Example〕

An embodiment in which the present invention is applied to an electronic wristwatch will be described below with reference to FIGS. 1 to 6.

FIG. 1 is a plan view of an electronic wristwatch, and FIG. 2 is a cross-sectional view taken along line AA of FIG. On the upper surface of the watch case 1, a glass mounting portion 1a on which a watch glass 2 is mounted is formed. The watch glass 2 is attached to the glass mounting portion 1a via an adhesive, for example, a double-sided adhesive tape 3. The upper surface of the watch glass 2 is equal in height to the upper surface of the watch case 1.

Further, a through hole 1b penetrating vertically through the watch case 1 is formed outside the glass mounting portion 1a of the watch case 1, and a concave groove 1c is formed in the upper outer peripheral surface.

On the upper surface of the watch case 1 and the upper surface of the watch glass 2, a panel switch 4, which will be described in detail later, is provided. The panel switch 4 is sandwiched and fixed between the watch case 1 and a bezel 11 via an adhesive member, for example, a double-sided adhesive tape 10.

The bezel 11 is arranged in the concave groove 1c of the watch case 1, is ultrasonically welded in the concave groove 1c, and is attached to the upper surface of the watch case 1.

Inside the watch case 1, a circuit board 13 having an LSI 12 on the upper surface is arranged on the lower surface inside the watch case 1, and above the circuit board 13, the functions of the matrix switch of the panel switch 4 described above and various A liquid crystal display panel 14 for displaying information is provided.

The liquid crystal display panel 14 is arranged on the lower surface of the watch glass 2 and is electrically connected to electrode terminals (not shown) of the circuit board 13 via the interconnector 15.

A zebra-shaped interconnector 16 is housed and held in a through hole 1b penetrating the watch case 1 up and down. The interconnector 16 includes an insulator and a conductor for electrically connecting connection portions 5e and 5f of the transparent film substrate 5 on the upper side of the panel switch 4 to be described later with a switch electrode (not shown) on the upper surface of the circuit board 13. Are conductive elastic members alternately laminated.

In the figure, reference numeral 17 denotes a synthetic resin housing, and the housing 17 has a battery housing hole 17a formed therein.
A power supply battery 18 is stored in the battery storage hole 17a.

The power battery 18 is held in the battery housing hole 17a by a battery restraining plate 20 attached to the lower surface of the housing 17 with screws 19.

In the figure, reference numeral 21 denotes a back cover attached to the lower surface of the watch case 1 via a waterproof packing 22.

However, when assembling the electronic watch described above, the watch glass 2 is mounted on the glass mounting portion 1a of the watch case 1 using the double-sided adhesive tape 3, and then the panel switch 4 is connected to the watch case 1 and the watch glass 2. Place it on top.

Then, the panel switch 4 is temporarily fixed with the bezel 11 via the double-sided adhesive tape 10, and the bezel 11 is ultrasonically welded.
And the watch case 1 are fixed. At this time, the panel switch 4 is fixed between the watch case 1 and the bezel 11.

Next, the watch case 1 is turned upside down with the bezel 11 facing down, and the interconnector 16 is inserted and arranged in the through hole 1b of the watch case 1.

Further, the liquid crystal display panel 14, the interconnector 15, the circuit board 13, the housing 17, and the power supply battery 18 are sequentially inserted and arranged inside the wristwatch case 1, and the battery restraining plate 20 is attached to the lower surface of the housing 17 with screws 19. . Finally, a back cover is attached to the lower surface of the watch case 1 via the waterproof packing 22.
With 21 attached, the electronic watch is assembled and completed.

The panel switch 4 comprises two rectangular transparent film substrates 5 and 6 as shown in FIGS. 3 and 4.

FIG. 6 shows a transparent film substrate 5 made of polyester or polycarbonate resin having a thin metal wire (wire wire) 5a embedded on the lower surface and a transparent film substrate 6 having a plurality of thin metal wires (wire wire) 6a embedded on the upper surface. In this case, the thin metal wires are arranged so as to face each other.

However, each of the thin metal wires (wire wires) 5a and 6a is disposed so as to intersect, and one end of each of the plurality of thin metal wires 5a embedded in the lower surface of the transparent film substrate 5 is provided every four wires. Connected to silver paste electrodes 5b, 5b.

Further, one end of each of the plurality of fine metal wires 6a embedded in the lower surface of the transparent film substrate 6 is also provided every four silver paste electrodes 6b.
It is connected to the.

A lead wire 5d is formed from the silver paste electrode 5b, 5b toward the side 5c, and a connection terminal 5e is formed on the side 5c, and four connection terminals 5f are formed separately from the connection terminal 5e. Are formed.

A lead wire 6c is formed from each of the silver paste electrodes 6b, and a connection terminal portion 6d is formed by the lead wire 6c.

Further, a shield electrode 5g made of silver paste is formed on the periphery of the film substrate 5 so as to surround the thin metal wire 5a and the silver paste electrode 5b.

The connection terminal 5f of the transparent film substrate 5 and the connection terminal 6d of the transparent film substrate 6 are electrically connected via an anisotropic conductive rubber connector (not shown).

In addition, as shown in FIGS.
A large number of spacers 8 are arranged between the transparent film substrate 6 and the transparent film substrate 6 so that even when a switch operation is performed between the transparent film substrate 5 and the transparent film substrate 6 by these spacers, a space is provided except for the operation section. And placed.

Further, a transparent hard coating layer 9 for preventing scratches is attached to the upper surface of the transparent film substrate 5 and the lower surface of the transparent film substrate 6.

The film substrate 5 and the film substrate 6 are stacked with the film substrate 6 facing upward such that the side A of the film substrate 6 is positioned as shown in FIG. A double-sided adhesive tape 30 is arranged around the film substrates 5 and 6 at the position shown in FIG. 5B to bond the two film substrates together and to form a conductive shield electrode 5g.
And the lead wiring 6c are not electrically connected.

Further, by using the double-sided adhesive tape 30, when the spacer 8 is in the non-operation state, it does not come into contact with the other film substrate 5, thereby preventing malfunction.

However, a reference potential, for example, a ground potential is supplied to the shield electrode 5g of the film substrate via an electrode (not shown) of the circuit board 13 via a connection member 31 such as a coil spring. It is possible to prevent the influence of static electricity from the outside on the key input section.

In the above embodiment, the shield electrode and the power supply are connected by the connection member 31, but the connection may be performed by the interconnector 16.

In the above-described embodiment, the panel switch is attached to the electronic wristwatch. However, the panel switch is not limited to the electronic wristwatch, but may be attached to other small electronic devices such as a calculator and a handy terminal.

[Effect of the invention]

This device has the above-mentioned configuration, so it can prevent noise such as static electricity from the outside, reliably prevent the destruction and malfunction of LSI etc., and can easily fix the panel switch to the case and shield it. This has the effect of making the use electrodes inconspicuous.

[Brief description of the drawings]

FIG. 1 is an external front view of an electronic wristwatch incorporating a panel switch according to one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIGS. FIG. 6 is a partial cross-sectional view of the panel switch, FIG. 7 is an exploded perspective view of the conventional panel switch, and FIG. is there. 4: Panel switch, 5, 6: Transparent film substrate, 5g ...
Shield electrode

Claims (1)

(57) [Scope of request for utility model registration] 1. A case having a glass provided on an upper surface thereof, and two transparent substrates provided on an upper surface of the glass and having switch electrodes formed on opposing surfaces, wherein the two transparent substrates are provided. A panel switch in which a shielding electrode is formed on at least one of the transparent substrates so as to surround the switch electrode; and a bezel fixed to the case, which attaches the panel switch to the upper surface of the glass and covers a periphery of the panel switch. A connection member for electrically connecting the shield electrode of the panel switch to a reference potential in the case.