JPH0573500A - Sheet keyboard structure - Google Patents

Abstract

PURPOSE:To equalize the conductive resistance of a wiring pattern and to eliminate the danger such as a pattern cutting. CONSTITUTION:In a sheet keyboard 1 to polymerize sheets 2 and 3 to lay a contact pattern and wiring patterns 2b and 3a at the relative inside and to constitute plural contact pairs by the contact of one side sheet and the corresponding contact of other side sheet, the tip part of the wiring patterns 2b, 3a of both sheets is collected to one tip side respectively, and a terminal part for external connection is batch-formed at one side of the sheet keyboard 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the structure of a seat keyboard for small electronic devices.

[0002]

2. Description of the Related Art An example of a seat keyboard used in a small electronic device is shown in FIGS. In the illustrated sheet keyboard 41, a contact pattern 43 and a wiring pattern 44 are formed on one surface of a rectangular thin sheet by printing or the like, and the sheet keyboard 41 is folded back around the center and the upper and lower sheet portions 41 are formed.
Corresponding contact points 43a and 43b of a and 41b form a contact point pair, and the contact point (switch) is turned on / off by applying pressure from the outside to the contact point.
It can be F. In addition, a thin resin sheet (spacer) (not shown), which is hollowed out, is sandwiched between the upper sheet and the lower sheet so that the corresponding upper and lower contacts can come into contact with each other.

The wiring patterns 44 of both the sheet portions 41a and 41b are gathered in the external connection terminal portion 41c at the right end portion of the lower sheet portion 41a.

[0004]

The wiring pattern 44b on the inner side of the upper sheet portion 41b is arranged so as to reach the external connection terminal portion 41c at the right end portion after wrapping around the sheet folded portion 41d at the left end portion. Due to the structure in which the wiring patterns 44a of the side seat portion 41a are laid out so as to be sewn between the wiring patterns 44a, the pattern length is lower than the lower seat portion 41a.
It becomes longer than that, and there is a problem in terms of conduction resistance. In addition, at the sheet folding back portion 41d, the upper sheet portion 4
This is a problem because the wiring pattern 44b of 1b may be broken or damaged.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a sheet having a contact pattern and a wiring pattern laid on opposite inner sides is superposed, and a contact point of one sheet and a corresponding contact point of the other sheet are superposed. In a sheet keyboard in which a plurality of contact pairs are formed by and, the end portions of the wiring patterns of both sheets are concentrated on one end side respectively, and the terminal portion for external connection is collectively formed on one side of the sheet keyboard. Is a structural feature.

[0006]

Since the end portions of the wiring patterns of the opposing sheets are concentrated on one end side and the external connection terminal portions are collectively formed, the wiring patterns of one sheet sew between the wiring patterns of the other sheet. Since it is not necessary to lay it on the board, the pattern width can be widened and the risk of pattern breakage is reduced. Furthermore, since the wiring pattern can be made relatively short as a whole, the conduction resistance becomes uniform.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing a first embodiment of a seat keyboard structure according to the present invention, and FIG. 3 is a view showing a second embodiment. First, referring to FIGS. 1 and 2, the first embodiment will be described.

The sheet keyboard 1 of this embodiment is basically an upper sheet 2, a lower sheet 3, a sheet-like spacer 4 sandwiched between both sheets 2 and 3, and both sheets 2 and 3.
The terminal sheet 5 is sandwiched between the end portions of the. Note that FIG.
For convenience of explanation, the upper sheet 2 shown in (1) is drawn 180 degrees so that the surface on the inside when the sheet keyboard is assembled faces upward.

Terminal sheet 5 constituting the external connection terminal portion
Has eight terminal portions, and when the seat keyboard is assembled, the four terminal portions 5a on the front side in FIG.
The four wiring patterns 3a on the lower sheet 3 are electrically connected to each other through one through hole 5c, and the remaining four terminal portions 5b on the inner side are in direct contact with the wiring patterns 2b on the upper sheet 2, respectively. Are electrically connected. As an adhesion method at this time, for example, an anisotropic conductive adhesive may be used.

Between the upper sheet 2 and the lower sheet 3, sheet-like spacers 4 made of a thin resin, which are hollowed out, are sandwiched so that the corresponding upper and lower contacts can come into contact with each other. However, the illustration is omitted in FIG. The first embodiment having the above configuration is preferable in terms of conduction resistance because the lengths of the wiring patterns can be averaged as a whole. Moreover, the conventional structure (see FIG. 5)
Since the wiring pattern does not have such a structure as to pass through the folded portion of the sheet, it is possible to avoid the risk of pattern breakage. Furthermore, since it is not necessary to draw the wiring pattern on one surface as in the conventional case, the layout design of the wiring pattern is facilitated.

The second embodiment will be briefly described below with reference to FIG. The seat keyboard 11 of this embodiment basically comprises an upper sheet 12, a lower sheet 13, and a thin resin sheet (not shown) sandwiched between the both sheets 12, 13. That is, unlike the case of the first embodiment, it does not have an independent (or independent) terminal sheet. Instead, on the right end side of the lower sheet 13,
It has an external connection terminal portion. For convenience of explanation, the upper sheet 12 shown in FIG. 3 is drawn with 180 degrees upside down so that the surface on the inside when the sheet keyboard is assembled faces upward.

At the external connection terminal portion of the lower sheet 13,
Eight terminal portions are provided, the four terminal portions 13a on the front side in FIG. 3 are obtained by extending the wiring pattern of the lower sheet 13, and the remaining four terminal portions 13b on the rear side are arranged in parallel. It consists of a short linear pattern. This back terminal part 1
At the time of assembling the sheet keyboard, 3b is in direct contact with and electrically connected to the four wiring patterns 12b at the right end of the upper sheet 12 which are inverted and stacked on the lower sheet. As the bonding method at this time, it is conceivable to use an anisotropic conductive adhesive, for example, as in the first embodiment.

In the second embodiment having the above construction, in addition to the same effect as that of the first embodiment, a new effect of cost reduction due to the reduction of the number of parts can be obtained.

[0014]

As described above, according to the present invention, the conduction resistance in the wiring pattern of the sheet keyboard can be made uniform, and the risk of pattern breakage can be eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a seat keyboard structure according to the present invention.

FIG. 2 is an exploded perspective view of the first embodiment.

FIG. 3 is an exploded perspective view of a second embodiment.

FIG. 4 is a perspective view of a conventional seat keyboard.

FIG. 5 is an exploded perspective view of a conventional seat keyboard.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sheet keyboard 2 ... Upper sheet 3 ... Lower sheet 4 ... Spacer 5 ... Terminal sheet 2b, 3a ... Wiring pattern 5a, 5b ... Terminal part 5c ... Through hole 11 ... Sheet keyboard 12 ... Upper sheet 13 ... Lower sheet 12b ... Wiring patterns 13a, 13b ... Terminal part

Claims (1)

[Claims] 1. A sheet (2, 3, 12, 13) having a contact pattern and a wiring pattern (2b, 3a, 12b, 13a, 13b) laid on opposite insides is polymerized, and the contact of one sheet and the other A seat keyboard (1, 1 is composed of a plurality of contact pairs with corresponding contacts of the seat.
In 1), the wiring patterns (2b, 3a,
12b, 13a, 13b) so that the end portions thereof are concentrated on one end side, respectively, and a terminal portion for external connection is collectively formed on one side of the sheet keyboard (1, 11).