JPH0526655Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to key input devices, and is particularly applicable to multiple sheets such as display films, key sheets, spacers, and presser plates used in small electronic desktop calculators. The present invention relates to a key input device configured by.

[Prior Art] FIG. 3 is an exploded perspective view of a key input device in, for example, a small electronic desktop calculator.

In the figure, 1 is a display film, 2 is a key sheet, 3 is a spacer sandwiched between the key sheets 2 and 4, and 5 is a press plate serving as a base for the key input device. The conventional key input device is constructed as described above, and first, the key sheets 2 and 4 are pasted together from both sides of the spacer 3 with an adhesive using a jig. After that, using the same jig, display film 1 is placed on one side and presser plate 5 is placed on the other side.
are pasted onto the key sheets 2 and 4 via adhesive, respectively. In this way, the key input device is assembled.

FIG. 2 is a partially assembled perspective view of the key input device shown in FIG. 3, showing in detail adhesive portions to be bonded together. Referring to this figure, adhesives 3a and 3b are applied to both sides of the spacer 3.
are applied by printing, and the spacer 3 and the key sheet 2, and the spacer 3 and the key sheet 4 are bonded together by these. Further, an adhesive 1a is applied to one side of the display film 1 by printing.
and the key sheet 2 are adhered. Furthermore, an adhesive 5a is applied to one side of the presser plate 5 by printing, and the presser plate 5 and the key sheet 4 are thereby bonded together. In this way, the key input device is assembled by fixing each sheet.

[Problems to be solved by the invention] The conventional key input device as described above has a sheet on which adhesive is applied on both sides, so the work processes such as pasting and pressing in assembling each sheet are difficult. It was complicated. Along with this, there was a problem that a large number of jigs and tools were required.

Therefore, this invention was made to solve the above-mentioned problems, and the object is to obtain a key input device that can simplify the work process in assembling the key input device.

[Means for Solving the Problems] A key input device according to this invention includes at least a first sheet, a second sheet, and a third sheet that are overlapped and bonded together using an adhesive. In the key input device configured, the second sheet is provided with a penetrating hole, and at least one of the first sheet and the third sheet has an adhesive on its surface. and is bonded to the second sheet using the adhesive. Furthermore, the first sheet and the third sheet are bonded together by the adhesive passing through the holes and reaching the surface of the other sheet,
The first sheet, the second sheet, and the third sheet are fixed together.

[Operation] In this invention, the adhesive applied on the surface of the first sheet or the third sheet passes through the through hole provided in the second sheet and reaches the surface of the other sheet. The first sheet and third sheet on both sides of the second sheet are adhesively fixed. Therefore, by simply applying adhesive on the surface of one sheet, i.e., the first sheet or the third sheet, without applying adhesive on the surface of the second sheet, the first sheet, the third sheet, etc. The second sheet and the third sheet can be affixed.

[Example] FIG. 1 is a partially assembled perspective view of a key input device constructed according to the present invention in the key input device shown in FIG. be.

In the figure, 1 is a display film, 2 is a key sheet, 3 is a spacer sandwiched between the key sheets 2 and 4, and 5 is a press plate serving as a base for the key input device. 1a is an adhesive applied by printing on the surface of the display film 1;
5a is an adhesive applied on the surface of the presser plate 5. A is a hole provided in the key sheets 2 and 4.

When the key input device configured as described above is assembled, the portion of the adhesive 1a applied to the display film 1 that faces the hole A provided in the key sheet 2 passes through the hole A. , the spacer 3 reaches the part indicated by C, and the display film 1 and the spacer 3 are bonded together. Further, the adhesive in the portion of the adhesive 1a that does not face the hole A adheres the display film 1 and the key sheet 2 at the portion indicated by B on the key sheet 2.
In this way, the display film 1, key sheet 2, and spacer 3 are adhesively fixed. In the same manner, the spacer 3, key sheet 4, and presser plate 5 are also adhesively fixed. The key input device is assembled as described above.

Therefore, in the case of this embodiment, the only sheets to which adhesive is applied are the display film 1 and the presser plate 5, and there is no sheet to which adhesive is applied on both sides, which reduces the work involved in assembling the key input device. The process can be simplified.

Further, FIG. 4 is a perspective view showing a card type electronic desktop calculator assembled using the key input device according to the present invention. Figures 5 and 6 are a of Figure 4.
FIG. 5 is a partial sectional view taken along line -a, and FIG. 5 shows an example of the present invention, and FIG. 6 shows a conventional example.

Referring to these figures, both the present invention example and the conventional example are composed of five sheets, that is, a display film 1, a key sheet 2, a spacer 3, a key sheet 4, and a presser plate 5. In FIG. 5, which shows an example of the present invention, the key sheets 2 and 4 are provided with a hole in the center. 1a is display film 1
3a and 3b are the adhesives applied to both sides of the spacer 3, and 5a is the adhesive applied to the presser plate 5. As shown in the figure, according to the present invention, there is no need to provide a layer of adhesive between each sheet. Therefore, the number of adhesive layers required for fixing five sheets as in the conventional example can be reduced from four to two. Further, according to the present invention, as shown in FIG. 5, only the portion where the hole is provided is made thinner, so that the key input device can be made thinner by press compression.

[Effects of the invention] As described above, according to this invention, when assembling a key input device, the adhesive layer provided between sheets can be reduced, so the series of operations and repairs required for pasting and pressing the sheets can be reduced. Tools can be reduced. Furthermore, it is possible to make the key input device thinner.

[Brief explanation of drawings]

Fig. 1 is a partially assembled perspective view of a key input device showing an embodiment of this invention, Fig. 2 is a partially assembled perspective view showing a conventional key input device, and Fig. 3 is a key input device for a small electronic desktop calculator. FIG. 4 is a perspective view showing a card type electronic desk calculator suitable for assembly using the key input device according to this invention, and FIG. FIG. 6 is a partial sectional view of a conventional key input device used in a card-type electronic desktop calculator. In the figure, 1 is a display film, 2 is a key sheet, 3 is a spacer, 4 is a key sheet, and 5
is a presser plate, and 1a and 5a are adhesives. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims for utility model registration] At least the first sheet, the second sheet, and the third sheet.
In the key input device, the second sheet is provided with a through hole, and the second sheet is provided with a through hole, and the first sheet and the first sheet At least one of the 3 sheets is
an adhesive is applied onto the surface thereof and is bonded to a second sheet by the adhesive; A key input device in which the first sheet, the second sheet, and the third sheet are secured by being adhesively bonded by reaching onto the surface of the other sheet.