JPH029403Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a small electronic device having a soft synthetic resin case.

[Background of the idea]

In general, small electronic calculators that are wrapped in a soft synthetic resin case and can be folded into two left and right halves at the center of the case are equipped with a sheet-like keyboard switch on one side of the case and a liquid crystal display on the other side. By arranging a decorative panel that covers the keyboard, solar cells, etc., the keyboard switch does not become too small, and the entire device is constructed in a compact size that can be stored in a pocket or the like.

However, unlike cases made of hard synthetic resin, the small electronic calculators mentioned above are entirely made of soft synthetic resin, so it is not possible to fold the case into left and right halves and put it in, for example, a pocket. In such cases, an excessive force may be applied to the keyboard switch, deforming it, and causing the keyboard switch to come into contact with the surface of a liquid crystal display, a solar cell, a decorative panel, or the like. In such a case, there is a problem in that the surfaces of the keyboard switch, liquid crystal display, solar cells, decorative panels, etc. are scratched as the two sides rub against each other, reducing the product value. When solar cells were used, there was a problem in that when the keyboard switch was pressed, the stored equipment would start operating on its own.

[Purpose of invention]

This idea was made against the background of the above-mentioned circumstances, and when the soft synthetic resin case is folded,
To provide a small electronic device having a soft synthetic resin case that prevents a keyboard switch from coming into contact with a decorative panel, a display device, etc. and causing damage to each other, and preventing the keyboard switch from being pressed and causing the device to operate automatically. It's about doing.

[Key points of the idea]

In order to achieve the above purpose, this invention created a gap between the keyboard switch and the decorative panel to prevent them from touching each other when the soft synthetic resin case was folded. be.

〔Example〕

1 to 5 show a small electronic calculator of this invention, in which numeral 1 is a keyboard switch and numeral 2 is a decorative panel made of an aluminum plate. As shown in FIG. 2, this decorative panel 2 has a structure in which a central portion excluding the peripheral portion protrudes slightly upward, and display windows 2a and 2b are formed in this protruding central portion. Further, below the decorative panel 2, an inner case 6 that houses a printed circuit board 3, a liquid crystal display device 4, and a solar cell 5 is arranged. This inner case 6
is made of plastic, and the printed circuit board 3,
The liquid crystal display device 4 and the solar cell 5 are the decorative panel 2
Storage portions 6a, 6b, and 6c for storing these are respectively formed so as not to protrude upward.
Among these storage sections 6a, 6b, and 6c, a storage section 6b that stores the liquid crystal display device 4 and the solar cell 5;
Reference numbers 6c are formed corresponding to the display windows 2a and 2b of the decorative panel 2, respectively, and a guide groove 6d is formed in the storage section 6a for storing the printed circuit board 3. Furthermore, the lower part of the inner case 6 is sloped to provide a smooth feel. Further, the upper part of the vertical wall in the peripheral portion of the inner case 6 is attached to the inner circumferential surface of the decorative panel 2 with adhesive tape. In this case, the printed circuit board 3 housed in the inner case 6 includes a liquid crystal display device 4 and a solar cell 5.
is heat seal (flexible connector) 4
a, 5a, and the keyboard switch 1 is also electrically connected via a heat seal (flexible connector) 7. This heat seal 7 is the storage part 6
The keyboard switch 1 and the printed circuit board 3 are connected by inserting the guide groove 6d of a. Furthermore, an electronic component 3a such as an LSI is attached to the lower surface of the printed circuit board 3. (See Figure 3).

On the other hand, the keyboard switch 1 connected to the printed circuit board 3 is constructed as shown in FIG. That is, the keyboard switch 1 includes, in order from the top, a keyboard sheet 8, a movable contact sheet 9,
A spacer 10 and a fixed contact sheet 11 are laminated. The keyboard sheet 8 is made by bonding a top sheet 12 made of hard vinyl chloride and a printing sheet 13 with a transparent adhesive 14, and a key symbol 13a is printed on the top surface of the printing sheet 13. ing. Furthermore, the movable contact sheet 9 and the fixed contact sheet 11 are made of hard vinyl chloride. A movable contact 9a is printed on the lower surface of the movable contact sheet 9 in correspondence with the key symbol 13a, and a fixed contact consisting of a pair of electrodes is printed on the upper surface of the fixed contact sheet 11, facing the movable contact 9a. Contact points 11a are printed. Then, the movable contact 9a and the fixed contact 11
a are opposed to each other through the through hole 10a of the spacer 10, and when the movable contact sheet 9 is pressed from above, the movable contact 9a passes through the through hole 10 and contacts the fixed contact 1.
1a and conducts the fixed contact 11a. Further, conductive patterns 9b and 11b are printed on the opposite surfaces of the contact sheets 9 and 11 on the printed circuit board 3 side (left side in FIG. 4), respectively, and these conductive patterns 9b and 11b are connected to the interconnector 15. electrically connected. In this case, the movable contact sheet 9 has its conductive pattern 9
The b side is extended toward the printed circuit board 3 side, and the above-mentioned heat seal 7 is connected to the conductive pattern 9b of this extended portion. That is, this heat seal 7 forms a wiring pattern 7b on an insulating film 7a.
One end of this wiring pattern 7b is connected to the conductive pattern 9a, and the other end is connected to the conductive pattern 3b of the printed circuit board 3. Also,
The heat seal 7 covers the upper surface of the wiring pattern 7b, the movable contact sheet 9, and the printed circuit board 3 with an insulating material 16.

The decorative panel 2 to which the inner case 6 containing the printed circuit board 3, liquid crystal display device 4, and solar cell 5 is adhered as described above, and the keyboard switch 1 are shown in FIGS. 2 and 3. As shown, it is wrapped with two upper and lower synthetic leather sheets 17 and 18. The synthetic leathers 17 and 18 are made of soft vinyl chloride for low temperature use, and the vinyl chloride contains about 48 parts by weight of a plasticizer and a phthalate ester for softening purposes. Among these synthetic leathers 17 and 18, the upper synthetic leather 17 has an opening display opening 17 in which the center portion of the decorative panel 2 is inserted from below and projects slightly upward.
a, and an opening keyboard opening 17b, which allows at least the key symbol 13a of the keyboard switch 1 to be operated from above, are formed on the left and right sides, respectively. Among these openings 17a and 17b, the opening 17 corresponding to the keyboard switch 1
b is formed to be slightly smaller than the peripheral edge of the central part of the decorative panel 2, and the peripheral edge is formed in the opening 1.
It comes into contact with the peripheral part of 7b. In addition, a storage recess 1 for storing an inner case 6 bonded to the decorative panel 2 is provided in the lower synthetic leather 18.
8a, and a storage recess 18b for storing the keyboard switch 1 and a stainless steel reinforcing plate 19 disposed thereunder. Then, the upper and lower synthetic leathers 17, 18 are welded by high frequency welding, with the decorative panel 2 to which the inner case 6 is adhered, the keyboard switch 1, and the reinforcing plate 19 sandwiched between the two synthetic leathers 17, 18. The peripheral and central portions of are glued together. In this case, a polyester adhesive is applied in advance to the periphery of each opening 17a, 17b on the lower surface of the upper synthetic leather 17, and nitrile-butadiene rubber (NBR) is applied to the periphery of the decorative panel 2. ) type adhesive to bond the upper synthetic leather 17 to the decorative panel 2 under heat.
7 is glued to the decorative panel 2. The keyboard switch 1 is thermocompression bonded to the upper synthetic leather 17 using a polyester adhesive.

However, according to the small electronic calculator configured as described above, the upper and lower synthetic leathers 17 and 18 can be bent into left and right sides at the center where they are glued together, as shown in FIG. It can be folded into Moreover, when folded in this way, the synthetic leather 17 above the center part of the decorative panel 2
Since the opening 17b on the side of the keyboard switch 1 is small, the peripheral edge of the center portion of the decorative panel 2 comes into contact with the upper synthetic leather 17, thereby creating a gap between the decorative panel 2 and the keyboard switch 1. Therefore, even if the decorative panel 2 protrudes from the upper synthetic leather 17, it does not come into direct contact with the keyboard switch 1, so both of them will not rub against each other and be damaged, resulting in a product with good commercial value. be able to. Furthermore, even if the keyboard switch 1 is folded and stored in a pocket or the like as described above, the keyboard switch 1 will not be pressed and the device will not operate automatically.

In addition, although the liquid crystal display device 4 was used as a display device in the said Example, it is not limited to this,
For example, an electroluminescent or electrochromic display device may be used. Further, the battery is not limited to the solar cell 5, but other batteries such as a lithium battery may be used.

[Effect of idea]

As explained above, the small electronic device having a soft synthetic resin case related to this invention is constructed so that a gap is created between the keyboard switch and the decorative panel when the soft synthetic resin case is folded. It is possible to reliably prevent the keyboard switch from coming into contact with a decorative panel, a display device, etc. and causing damage to each other, or the keyboard switch from being pressed and causing the equipment to operate without permission.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a small electronic calculator according to this invention, Fig. 2 is an exploded perspective view thereof, Fig. 3 is a sectional view of the assembled state, and Fig. 4 is an enlarged view of the main parts of Fig. 3. The sectional view and FIG. 5 are partially cutaway side views of the completed small electronic calculator in a folded state. 1... Keyboard switch, 2... Decorative panel, 4... Liquid crystal display device, 6... Inner case, 13a... Key symbol, 17... Upper synthetic leather, 17a, 17b... Opening, 18... Synthetic leather on the bottom.

Claims (1)

[Scope of utility model registration request] a keyboard switch having a key symbol;
a display device electrically connected to the keyboard switch to display information, an inner case housing the display device, a decorative panel attached to the inner case and having at least a display window for the display device, and the keyboard. It has a keyboard opening to which the outer peripheral edge of the switch is joined and a display opening to which the outer peripheral edge of the decorative panel or inner case is joined, and can be folded at the border between the keyboard switch and the inner case. The keyboard switch is provided with a soft synthetic resin case that encloses the inner case, and the keyboard switch is joined to the inner surface of the keyboard opening of the soft synthetic resin case, and the keyboard opening is connected to the decorative panel. by holding the periphery of the keyboard opening of the soft synthetic resin case on the upper surface of the decorative panel when the soft synthetic resin case is folded. A small electronic device having a soft synthetic resin case characterized by having a gap between it and a keyboard switch.