JPH0256696B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] This invention relates to a small electronic calculator with a notebook type case.

[Background of the invention]

In recent years, small electronic calculators with bifoldable notebook-shaped cases have been made by enclosing device cases with flexible synthetic leather, such as soft vinyl chloride sheets, to protect the devices and give them a luxurious feel. is being developed.

In such a small electronic calculator, an equipment case that houses predetermined electronic components and circuit boards, etc., and an aluminum plate for display and decoration placed on the equipment case are made of two upper and lower soft chloride plates. A method of sandwiching vinyl chloride sheets and bonding these two upper and lower vinyl chloride sheets using a high-frequency welder is being considered. In other words, since conventionally, soft vinyl chloride sheets and equipment cases contain plasticizers, for example, acrylic resins or nitrile resins have been used as adhesives for such bonding methods.
A method of thermocompression bonding using a plasticizer-resistant adhesive such as butadiene rubber (NBR resin) has been considered, but this method requires high temperature and pressure during thermocompression bonding. As a result, the surface of the soft vinyl chloride sheet becomes photosensitive, reducing its commercial value. In addition, this bonding method has the problem that the vinyl chloride sheet peels off from the aluminum plate during high-frequency welding to fuse the upper and lower vinyl chloride sheets.

For this reason, when adhering a soft vinyl chloride sheet to an equipment case, the selection of adhesive and bonding conditions are extremely difficult, and the adhesive strength is also weak. There are also problems such as poor durability of the bent portion of the vinyl chloride sheet.

[Purpose of the invention]

This invention was made against the background of the above-mentioned circumstances, and is capable of easily and firmly adhering a soft synthetic resin sheet such as a vinyl chloride sheet to an equipment case without using a special adhesive. An object of the present invention is to provide a small electronic calculator with a notebook-type case that has excellent durability at the bent portion of a soft synthetic resin sheet.

[Key points of the invention]

In order to achieve the above-mentioned object, this invention provides a flange on the peripheral edge of an equipment case and a lower step inside the flange, and provides a hard synthetic resin sheet at least on the bent side. At least one of the hard synthetic resin sheets is bonded together.
The portion is inserted into the stepped portion of the equipment case and is adhered to the flange or stepped portion of the equipment case.

[First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is an external perspective view of a small electronic calculator with a notebook type case. This small electronic calculator 1 is
A key switch section 3 is provided on the right side of a notebook type case 2 that can be folded into two, and a display section 5 and a solar cell section 5 are provided on the left side.

Figures 2 to 4 are the above-mentioned small electronic calculator 1.
2 is an exploded perspective view thereof, FIG. 3 is a sectional view of the assembled state, and FIG. 4 is a sectional view of the main part of FIG. 3. In these figures, the notebook type case 2 is made up of two soft vinyl chloride sheets 6, upper and lower.
7, and the upper vinyl chloride sheet 6
A switch opening 6a is formed on the right side, and a display opening 6b is formed on the left side. A keyboard switch 8 and a stainless steel reinforcing plate 9 are arranged on the right side between the two vinyl chloride sheets 6 and 7, and a hard vinyl chloride sheet 1 is arranged on the left side from above.
0, a decorative panel 11, and an inner case (equipment case) 12 are arranged. In this case, the liquid crystal display device 13, the solar cell 14, and the circuit board 15 are housed in the inner case 12, and the liquid crystal display device 13 and the solar cell 14 are placed in the circuit board 15. In addition to being electrically connected via seals (flexible connectors) 13a and 14a, the keyboard switch 8 mentioned above is also electrically connected via a heat seal (flexible connector) 16 (see Fig. 2). ).

The keyboard switch 8 disposed on the right side between the PVC sheets 6 and 7 is disposed on the lower surface of the upper soft PVC sheet 6 in correspondence with the display opening 6a, as shown in FIG. , its structure is such that a keyboard sheet 8a, a movable contact sheet 8b, a spacer 8c, and a fixed contact sheet 8d are laminated in order from the top.

On the other hand, a hard vinyl chloride sheet 10 is placed on the left side between the two upper and lower vinyl chloride sheets 6 and 7.
has approximately the same size as the left side of the upper soft vinyl chloride sheet 6, as shown in FIG.
a is formed, and is joined to the lower surface of the upper soft vinyl chloride sheet 6 by high frequency welding, as shown in FIGS. 3 and 4.

The decorative panel 11 is made of an aluminum plate, and as shown in FIG. 2, a display window 11a and a solar cell window 11b are formed at predetermined locations on the top surface, and as shown in FIGS. 3 and 4, It is attached to the upper part of the inner case 12 via an adhesive 17.

Furthermore, the inner case 12 is made of synthetic resin, and as shown in FIG. Each storage section 12a, 1 stores a
2b and 12c are formed, and a frame part 1 to which a decorative panel 11 is attached around the upper part.
2d is formed. This frame portion 12d projects upward through each opening 10a, 6b of the hard vinyl chloride sheet 10 and the upper soft vinyl chloride sheet 6, and is formed to have the same size as each opening 10a, 6b. Furthermore, a groove (step) 18 is formed in the peripheral flange of the inner case 12 . As shown in FIG. 4, this groove 18 is
When the frame 12d of the inner case 12 is projected upward from below through the openings 10a, 6a of each vinyl chloride sheet 10, 6, the hard vinyl chloride sheet 10 is recessed, and the hard vinyl chloride sheet 10. In this case, the hard vinyl chloride sheet 10 is bonded to the adhesive 19.
The end of the decorative panel 11 attached to the frame 12d of the inner case 12 connects the soft vinyl chloride sheet 6 to the groove 18.
It is held down through the The adhesive 19 used here is for adhesion between the hard vinyl chloride sheet 10 and the inner case 12, so an acrylic adhesive may be used. Nitz-
#500) etc. can be used. Note that the lower peripheral edge of the inner case 12 is an inclined surface so as to provide a smooth feel.

Next, the case of assembling the small electronic calculator 1 as described above will be briefly explained.

In this case, as shown in FIG.
are connected by heat seals 13a and 14a, respectively, and the keyboard switch 8 is also electrically connected by a heat seal 16. Then, the liquid crystal display device 13, the solar cell 14, and the circuit board 1
5 is housed and arranged in the inner case 12.

Thereafter, a hard vinyl chloride sheet 10 is bonded to the lower surface of the upper soft vinyl chloride sheet 6 using a high-frequency welder in correspondence with the display opening 6b. Then, the upper soft vinyl chloride sheet 6
are placed on the upper surfaces of the inner case 12 and the keyboard switch 8 from above, and the frame portion 12d of the inner case 12 is made to protrude upward through the openings 6b and 10a of each of the vinyl chloride sheets 6 and 10. A hard vinyl chloride sheet 10 is inserted into the groove 18 (see FIGS. 3 and 4). At this time, an adhesive 19 is provided between the hard vinyl chloride sheet 6 and the groove 18 of the inner case 12, and pressure is applied from the top surface of the soft vinyl chloride sheet 6 to the groove of the inner case 12 to make the hard vinyl chloride sheet 6 and the inner case 12 are firmly adhered. After that, the decorative panel 11 is attached to the frame 12d of the inner case 12 from above the upper soft vinyl chloride sheet 6 via the adhesive 17, and the decorative panel 11 is attached to the edge of the decorative panel 11 via the soft vinyl chloride sheet 6. , press down the hard vinyl chloride sheet 10 (see FIG. 4).

After that, a reinforcing plate 9 is placed under the keyboard switch 8, and this reinforcing plate 9 and the inner case 12
A lower soft vinyl chloride sheet 7 is placed on each lower surface of the lower soft vinyl chloride sheet 7, and the lower soft vinyl chloride sheet 7 and the upper soft vinyl chloride sheet 6 are welded using a high frequency welder, and the peripheral and intermediate portions are welded together as shown in FIG. Fourth
Weld as shown. Then, as shown in FIG. 1, a small electronic calculator 1 with a notebook type case is obtained which can be bent in two with the intermediate portion serving as a bending portion 2a.

According to the small electronic calculator 1 with a notebook-type case obtained in this way, of the two upper and lower soft vinyl chloride sheets 6 and 7 that enclose the inner case 12, the lower surface of the upper soft vinyl chloride sheet 6 is made of plastic. Hard vinyl chloride sheet with low agent content 10
This hard vinyl chloride sheet 10 is inserted into the groove 18 of the inner case 12 to lock it, and is also bonded with an adhesive 19, which eliminates the extremely strict selection of adhesive used in the past. Alternatively, a commercially available acrylic room-temperature curing adhesive can be used without being subject to restrictions such as bonding conditions, and the soft vinyl chloride sheet 6 and the inner case 12 can be bonded to the above-mentioned hard vinyl chloride sheet. 10 can be easily and favorably bonded, and the bonding strength can also be increased. Moreover, since the soft vinyl chloride sheet 6 can be bonded to the inner case 12 as described above, the upper and lower two soft vinyl chloride sheets 6 and 7
It is also possible to improve the durability of the bent portion 2a at the joint.

In addition, in the above-described small electronic calculator 1, the upper soft vinyl chloride sheet 6, which has the hard vinyl chloride sheet 10 bonded to the lower surface that is inserted into the groove 18 of the inner case 12 and bonded, is attached to the inner case 12. At the end of the decorative panel 11 attached to the upper part of the case 12, the hard vinyl chloride sheet 1 is
Since it is pressed together with 0, also by this,
The soft vinyl chloride sheet 6 is firmly fixed.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 7. In this case, the same parts as those in the first embodiment described above are given the same reference numerals, and the explanation thereof will be omitted.

FIG. 5 is an enlarged cross-sectional view showing the bonded state of the inner case 12 and the soft vinyl chloride sheets 6 and 7 near the bent portion 2a of the notebook type case 2. The inner case 12 shown in this figure has almost the same structure as the first embodiment described above, but the groove (step) 21 formed in the peripheral flange 20 is formed in the frame part 12.
It is provided only at locations close to d. On the other hand, the upper soft vinyl chloride sheet 6 covering the inner case 12 has a hard vinyl chloride sheet 2 on its lower surface.
The hard vinyl chloride sheet 6 is bonded onto the peripheral flange 20 of the inner case 12 with the same adhesive 19 as in the first embodiment described above. The upper soft vinyl chloride sheet 6 and the hard vinyl chloride sheet 22 extending in the grooves 21 of 12 are formed into grooves by the ends of the decorative panel 11 attached to the frame 12d of the inner case 12 via the adhesive 17. It is pushed into the groove 21 and is recessed and locked in the groove 21. In this case, the tip of the soft vinyl chloride sheet 6 pushed into the groove 21, that is, the display opening 6b of the soft vinyl chloride sheet 6.
A semicircular protrusion 23 is formed on the edge of the hard vinyl chloride sheet 22 that protrudes upward.
extends between the upper and lower two soft vinyl chloride sheets 6 and 7 at the folded portion 2a of the notebook-type case 2, and is also arranged between these sheets.

6 and 7 show the process of joining a hard vinyl chloride sheet 22 to a soft vinyl chloride sheet 6. FIG. First, as shown in FIG. 6, a hard vinyl chloride sheet 22 is placed on the lower surface of the soft vinyl chloride sheet 6, and these are welded together using a high-frequency welder. The portions corresponding to the openings 6b and 22a are cut. In this case, the cutter 24 has a semicircular recess 24a formed at its base. Therefore, the vinyl chloride sheets 6, 22 are joined as shown in FIG. That is, the thickness of the soft vinyl chloride sheet 6 is thinner in the area heated and pressurized by the high-frequency welder than in other parts, and a portion corresponding to the recess 24a of the cutter 24, that is, the edge of the opening 6b, is thinner. The soft vinyl chloride sheet 6 protrudes upward in a semicircular shape to form a protrusion 23.

However, even in the above-mentioned small electronic calculator with a notebook type case, in addition to the same effects as in the first embodiment described above, in particular, the soft vinyl chloride sheet 6 to which the hard vinyl chloride sheet 22 is bonded is used. A semicircular protrusion 23 is provided at the end, that is, the edge of the display opening 6b, and this protrusion 23 is attached to the frame 12d of the inner case 12. Since it is pushed into the groove 21 of the case 12 and is recessed and locked, the upper soft vinyl chloride sheet 6
This has the effect of being able to hold down even better.

[Third Embodiment] Next, a third embodiment of the present invention will be described with reference to FIGS. 8A, B, and C. In this third embodiment, high-frequency welding is performed all at once in the final step, and the same parts as in the above-mentioned second embodiment are given the same reference numerals, and the explanation thereof will be omitted.

FIG. 8A is an enlarged sectional view showing the bonded state of the inner case 12 and the soft vinyl chloride sheets 6 and 7 surrounding it. The inner case 12 shown in this figure is constructed similarly to the second embodiment described above. An aluminum foil 31 is attached to the peripheral flange 20 of the inner case 12 via an adhesive 30, and a hard vinyl chloride sheet 22 is attached to the aluminum foil 31 via an adhesive 32. installed. Furthermore, an upper soft vinyl chloride sheet 6 is bonded onto the hard vinyl chloride sheet 22 by a high-frequency welder, as will be described later. In this case, the hard vinyl chloride sheet 22 and the soft vinyl chloride sheet 6 extend into a groove 21 formed in the peripheral flange 20 of the inner case 12. Then, the lower soft vinyl chloride sheet 7 is placed under the inner case 12, and after this soft vinyl chloride sheet 7 and the upper soft vinyl chloride sheet 6 are joined using a high frequency welder, the frame portion 12d of the inner case 12 is Attach the decorative panel 11 to the via adhesive 17,
The ends of this decorative panel 11 allow the upper soft vinyl chloride sheet 6 and the hard vinyl chloride sheet 2 to
2 is pushed into the groove 21 of the inner case 12 and is locked therein.

FIG. 8B shows the aluminum foil 32 mentioned above. This aluminum foil 31 has approximately the same size as the hard vinyl chloride sheet 22, and the center of the aluminum foil 31 is located closer to the inner case 12 than the openings 22a and 6b of the hard vinyl chloride sheet 22 and the upper soft vinyl chloride sheet 6. An opening 31a that is as large as the width of the groove 21 is formed, and an electrode portion 31b is formed protruding from one side (the right side in the figure) of the opening 31a. This electrode portion 31b is bent along the side and lower slopes of the inner case 12,
It extends to the lower surface of the inner case 12.

FIG. 8C shows a state in which the upper soft vinyl chloride sheet 6 is joined to the hard vinyl chloride sheet 22 attached to the inner case 12 via the aluminum foil 31 using a high-frequency welder. In this case, in advance, the peripheral flange 2 of the inner case 12 is
An aluminum foil 31 is attached onto the aluminum foil 31 via an adhesive 30, and a hard vinyl chloride sheet 22 is attached onto the aluminum foil 31 via an adhesive 32. After that, the electrode part 31b of the aluminum foil 31 is bent along the side and slope of the inner case 12, and the tip of the electrode part 31b is placed on the lower surface of the inner case 12, and the upper part is placed on the hard vinyl chloride sheet 22. A soft vinyl chloride sheet 6 is placed. Then, the inner case 12 is placed on the negative electrode side 33 of the high frequency welder, and the electrode part 31b of the aluminum foil 31 is connected to the negative electrode side 33 of the high frequency welder.
3. In this state, when the upper soft vinyl chloride sheet 6 is heated and pressed by the positive electrode side 34 of the high frequency welder, the soft vinyl chloride sheet 6 is welded to the hard vinyl chloride sheet 22. At this time, the negative electrode side 33 of the high frequency welder is connected to the aluminum foil 31.
Since it approaches the positive electrode side 34 through the , it becomes easy to join the soft vinyl chloride sheet 6 and the hard vinyl chloride sheet 22 using a high-frequency welder. In addition,
Thereafter, the lower soft vinyl chloride sheet 7 is placed under the inner case 12, and the soft vinyl chloride sheet 7 and the upper soft vinyl chloride sheet 6 are successively welded by high frequency welding. Then, the decorative panel 11 is glued to the frame 12d of the inner case 12, and the upper soft vinyl chloride sheet 6 and the hard vinyl chloride sheet 2 are connected to the ends of the decorative panel 11.
2 into the groove 21 of the inner case 12, a small electronic calculator with a notebook type case similar to the second embodiment described above can be obtained.

However, in the case of the above-mentioned small electronic calculator, the high-frequency welding can be performed all at once in the final process, so it can be manufactured more easily than those of the first and second embodiments described above. .

In addition, in each of the above-mentioned embodiments, the notebook type case 2
As, upper and lower two soft vinyl chloride sheets 6, 7
However, in this invention, vinyl chloride sheet 6,7
The present invention is not limited to the above, and other soft synthetic resin sheets may be used, and similarly, it is not necessary to use the hard vinyl chloride sheets 10 and 22, but other hard synthetic resin sheets may be used.

In addition, although the display section and the keyboard section are separated by a folding section in the explanation, the present invention is not limited to this, and the case is not limited to this case. It can also be applied to small electronic calculators with a notebook type case, such as those that cover one side of the calculator, or those that are folded in three or more by extending the notebook case section and providing a storage section for memo paper or commuter passes.

〔Effect of the invention〕

As explained above, according to the small electronic calculator with a notebook type case according to the present invention, a flange is provided on the peripheral edge of the device case, and a lower step is provided inside the flange, and a soft synthetic resin sheet is provided. A hard synthetic resin sheet is bonded to at least the bent portion side, and at least a portion of the hard synthetic resin sheet is immersed and locked in the stepped portion of the equipment case, and is adhered to the flange or stepped portion of the equipment case. Therefore, the soft synthetic resin sheet and the equipment case can be easily and well bonded together, and the adhesive strength can be increased. Furthermore, the durability of the bent portion of the soft synthetic resin sheet can be improved. can be achieved.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, FIG. 1 is an external perspective view of a small electronic calculator with a notebook type case, FIG. 2 is an exploded perspective view of FIG. 1,
Figure 3 is a cross-sectional view taken along the - line in Figure 1, Figure 4 is an enlarged cross-sectional view near the bend of the notebook type case, and Figure 5 is a cross-sectional view taken along the line -
7 to 7 show a second embodiment of the present invention,
Fig. 5 is an enlarged cross-sectional view of the folded portion of the notebook type case, Fig. 6 is a cross-sectional view showing the state in which a soft vinyl chloride sheet and a hard vinyl chloride sheet are joined together using a high-frequency welder, and Fig. 7 is a state in which they are joined. 8A, B, and C show a third embodiment of the present invention, FIG. 8A is an enlarged sectional view of the vicinity of the folded part of the notebook-type case, and FIG. The external perspective view and FIG. 8C are cross-sectional views showing a state in which a soft vinyl chloride sheet is joined to a hard vinyl chloride sheet using a high-frequency welder. 1...Small electronic calculator with notebook type case, 2
...Notebook type case, 2a...Folding part, 6,7...
Soft vinyl chloride sheet, 10, 22... Hard vinyl chloride sheet, 12... Inner case (equipment case), 18, 21... Concave groove (step portion).

Claims (1)

[Claims] 1. A small electronic calculator with a notebook-type case in which a foldable soft synthetic resin sheet is integrally formed in the device case and the display section and keyboard section provided on the device case are closed inside. A flange with a flat upper surface is provided on the peripheral edge of the case, and a lower step is provided inside the flange,
A hard synthetic resin sheet is bonded to at least the bent side of the soft synthetic resin sheet, and at least a portion of the hard synthetic resin sheet is immersed in the stepped portion of the equipment case, and the flange or stepped portion of the equipment case is A small electronic calculator with a notebook-type case, which is glued to the .