JPS60122456A - Small sized sheet form electronic device - Google Patents

Abstract

PURPOSE:To keep the strength and to attain a thin profile by adhering a sheet member and a case member of the upper face side. CONSTITUTION:An upper face sheet 12 and a lower sheet 13 constitute an upper case 1 of sheet form by being laminated closely together and a lower face sheet 14 and a lower sheet 15 constitute a lower case 2 of sheet form by being adhered together. Moreover, a frame 16 is laminated while being adhered between the cases 1 and 2 and supports an electronic parts assembly 11 while supporting the electronic parts assembly 11 therearound. The assembly 11 is formed by mounting copper foil being wiring patterns, a display element 34, a solar cell 43 and an integrated circuit element 26 on a board made of a flexible insulation film. The small sized electronic calculator forming an incorporated sheet as a whole is constituted by adhering the cases 1 and 2 to the upper and lower side of the assembly 11.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a thin sheet-like small electronic device.

[Technical background of the invention and its problems]

2. Description of the Related Art Recently, there has been a trend toward thinning of small electronic devices such as small electronic calculators, small electronic watches, and electronic game machines in order to improve portability.

Taking a small electronic calculator as an example, a portable calculator is a small and thin seed-like computer (like a credit card).
The goal is to create a card-shaped product. That is,
There is a demand for the development of a compact electronic calculator that is as thin as a sheet.

However, this kind of conventional small electronic calculator has a case made of synthetic resin molded or a combination of a metal plate, and inside this case there is a wiring board and a display panel. , batteries and other parts are installed.

However, the case structure of conventional small electronic calculators is based on the idea of increasing the thickness of the case to provide high rigidity in order to protect the parts inside the case from external forces. For this reason, the wall thickness of the case could not be made very thin, and therefore the thickness of the entire case was limited to about 1.6 m at its thinnest part. This has led to the problem that the small electronic calculator, ie, its case, cannot be made extremely thin like a credit card.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and is a sheet-like small electronic device that maintains strength, is thinner, and improves portability by having a structure in which the upper sheet member and the case member are bonded together. The purpose is to provide

[Summary of the Invention] The sheet-like small electronic device of the present invention covers electronic components such as an integrated circuit element 1 display element, battery, and board with a top sheet made of a resin film having a transparent display window and a key display section, Further, at least the peripheral portion of the top sheet and the substrate are bonded to a case member that accommodates the various electronic components on the inner side.

[Embodiments of the invention]

Embodiments of the present invention illustrated in the drawings will be described below.

Application of the sheet-like small electronic device of the present invention to a small electronic calculator 1. Another embodiment will be described.

1 to 78 show one embodiment of the present invention.

FIG. 1 is an external view of the small electronic calculator of this embodiment. As shown in this figure, the small electronic calculator has a rectangular sheet shape. Figure 2 is an exploded view of a small electronic calculator.
In this diagram! I is an electronic component structure, I2 is a top sheet, I3 is an upper sheet, I4 is a bottom sheet, I5 is a lower sheet, and I6 is a frame. Each of these sheets 12.13,
14.15 and frame I6 each have a rectangular outer shape with the same size. The upper sheet X2 and the upper sheet I3 are laminated in close contact with each other to constitute the upper case 1 in the form of a sheet, and the lower sheet 14 and the lower sheet I5 are in close contact with each other to constitute the lower case 2 in the form of a sheet. are doing.

Then, the upper case 1 is laminated in close contact with the upper side of the electronic component structure II, and the lower case 2 is laminated in close contact with the lower side of the electronic component structure ZZ. Note that the frame Z6 is laminated in close contact between the upper case 1 and the lower case 2, and supports the electronic component structure II by surrounding it. In this way, a small electronic calculator in the form of a rectangular sheet is assembled.

The configuration of each part of the small electronic calculator will be explained with reference to FIGS. 3 to 18. 3 to 9 are plan views showing each component. Figures 10 to 13 are cross-sectional views showing the laminated structure. Figure 10 shows the boundary between the substrate and the frame (section A in Figure 1), and Figure 11 shows the part where the operation switch is provided (Figure 1). Part B), Figure 12 shows the part where the display element is provided (
FIG. 1 (C part) and FIG. 13 show cross sections of the part where the battery is provided (first diagram part), respectively. The electronic component structure Z1 will be described with reference to FIGS. 3 and 14 to 18. As shown in FIG. 3, the substrate 21 is made of a flexible film such as glass epoxy resin or bismaleimide-triazine resin and has a rectangular sheet shape with a thickness of about 190 μm, and has predetermined wiring on its upper and lower surfaces. The copper foil 22 with a thickness of about 35 μm that forms the pattern has a thickness of 20 μm.
It is bonded through an insulating adhesive 23 of about μ. The wiring patterns, which are conductive lead means, formed by the copper foil 22 on the upper and lower surfaces of the substrate 2I include wiring, contacts, and terminals. ).

The wiring pattern on the upper surface of the substrate 2Z is schematically shown in FIG. 3, and connects fixed contacts, capacitors, display elements, batteries, light emitting diodes, etc. around the integrated circuit element. On the top half of the substrate 2I, a plurality of fixed contacts 24, which are switch elements, are arranged in a grid pattern as part of the wiring pattern, and the fixed contacts 24 consist of a pair of contacts. Each contact is connected to an integrated circuit element 26, which will be described later, via a wiring pattern. As shown in FIG. 14, in the other part of the board 2I, a hole 25 is formed leaving the wiring pattern (copper foil 22 and adhesive 23) on the lower surface, and a predetermined hole 25 is provided for turning the switch element on and off. A semiconductor integrated circuit element 26 that performs the calculation. In other words, the large-scale integrated circuit (LSI) is supported by the wiring pattern on the bottom side,
This integrated circuit element 26 is connected to the wiring pattern (copper foil 22) on the upper surface of the substrate 21 via a gold wire 27, and is covered from above with an insulating resin 28 such as silicone rubber or epoxy resin. The whole thing is sealed. The integrated circuit element 26 is, for example, 4 m long x 4 m wide.
The insulating resin 28 is, for example, M 10 m x width 10*i.
It has a thickness of 245 μm from the top surface of the AX integrated circuit. A hole 29 formed in the other part of the board 21 leaving the wiring pattern (copper foil 22 and adhesive 23) on the lower side
In Fig. 15 (as shown by q), the chip type capacitor 3
0 is supported by the wiring pattern on the bottom side,
This capacitor 3θ has electrodes 30a formed at both ends.
is bonded to the cream solder 31 applied to the hole 29 and connected to the wiring pattern (copper foil 22) on the upper surface of the board 2I, and the insulating adhesive 32 applied to the upper surface of the board 2Z
For example, the periphery is covered with ultraviolet curable ink. This capacitor 30 is connected to the integrated circuit element 26 via a wiring pattern. The corner of the other end of the board 21 is cut out leaving the wiring pattern (copper foil 22 and adhesive 23) on the bottom side, and this part is supported by the wiring pattern on the bottom side as shown in FIG. 16 (q). A light emitting diode 33 for power control is arranged at the top, and an electrode 33m of the light emitting diode 33 is bonded to cream solder 31 applied to the board 21 and connected to the wiring pattern (copper foil 22) on the top surface of the board 21. The periphery is sealed with an insulating adhesive 32, such as an ultraviolet curable ink, applied to the upper surface of the substrate 21.The light emitting diode 33 is connected to the integrated circuit element 26 via a wiring pattern 1.

A display element 34, ie, a liquid crystal panel, is arranged on one side edge of the substrate 21, and is connected to the wiring pattern on the upper surface side of the substrate 2I. As shown in FIG. 17, the display element (liquid crystal panel) 34 is made of a transparent resin film such as a polyester film with a built-in polarizer layer, and a liquid crystal 37 is sealed between upper and lower substrates 35 and 36 provided with electrodes. The surrounding area is sealed with a seal 38 [2, a thickness of 5 is applied to the lower surface of the lower electrode base 36]
A reflecting plate 39 having a thickness of approximately 0 μm is bonded to the reflector plate 39 using an adhesive having a thickness of approximately 15 μm. On the upper surface of the protrusion of the lower electrode base 36, a plurality of terminal electrodes 4o made of transparent conductive ink connected to the electrodes of each electrode base 35, 36 are arranged in the longitudinal direction. Display element (liquid crystal panel) 34
has a total thickness of about 550 μm, and has elasticity (toughness) due to the use of a film base. Also,
On one side edge of the upper surface of the board 21, a plurality of terminals 4I are formed by extending the copper foil 22 of the wiring pattern and arranged in the longitudinal direction. protruding towards the direction.

Terminal electrode 40 of display element (liquid crystal panel) 34 and substrate 21
The terminals 4I are bonded together and electrically connected by applying a conductive adhesive 42 such as carbon ink to their respective contact surfaces, and an insulating adhesive 32 such as ultraviolet curable ink is applied around the terminals 4I. It's covered. And display element 3
4 is an integrated circuit element 26 via the wiring pattern of the substrate 2I.
It is connected to the integrated circuit element 26 and displays predetermined information based on the signal from the integrated circuit element 26. A battery 43, for example a solar cell, for supplying a driving voltage to the integrated circuit element 26 is disposed on one side edge of the substrate 21, alongside the display element 34, and is connected to the wiring pattern of the substrate 2I. As shown in FIG. 18, the battery (solar cell) 43 is made by depositing an amorphous solar cell layer 46 on the upper surface of a metal substrate 44 made of stainless steel or the like through an insulating layer 45 of about 25 μm thick, such as polyimide.7. Further, a protective layer with a thickness of 17 mm is provided on the solar cell layer 46.
A polyester film 47 having a thickness of about 5 .mu.m is coated, and a pair of terminal electrodes 48, 48 are formed on the upper surface of the metal substrate 44 with an insulating layer 45 interposed therebetween. This cell (solar cell) 43 has a total thickness of about 300 μm and has elasticity (toughness) as a whole.

Furthermore, a pair of terminals 49.4y are formed on one side edge of the substrate 2Z, facing the battery (solar cell) 43, by making the copper foil 22 of the wiring pattern protrude laterally. The terminal electrodes 48 of the battery (solar cell) 43 and the terminals 49 of the substrate 21 are electrically connected by applying a conductive adhesive 42 such as carbon ink and adhering them to each other, and the surrounding area is insulating. The adhesive 32 is coated with, for example, ultraviolet curable ink. Therefore, the battery (solar cell) 43 is connected to the integrated circuit element 26 via the wiring pattern of the substrate 2I.

The electronic component assembly rx configured in this manner is arranged inside the frame Z6. The frame Z6 is made of, for example, hard vinyl chloride and has a thickness of about 300μ, and this frame 16 has a rectangular frame shape as shown in FIG. Depending on the arrangement, the shape that surrounds the parts is removed.

The frame Z6 is arranged around the electronic component structure II, as shown in FIGS. 3, 10, 12, and 13, to surround it.

The upper case 1 will be described with reference to FIGS. 4 to 6 and 10 to 13. Upper case I has upper sheet Z2
This is a combination of the upper sheet 13 and the upper sheet 13. Top sheet 1
2 is a rectangular sheet with excellent strength (toughness) formed of a transparent resin sheet such as a polyester film with a thickness of about 80 μm, and as shown in FIGS. 4 and 5, the electronic component structure II An operating section 50 is provided at a location corresponding to the fixed contact forming section of the substrate 21. This operation section 5
0 is each fixed contact 24 of the board 21 on the bottom surface of the top sheet 12.
1.7. A plurality of key name printing sections 5I are arranged in a grid pattern in correspondence with 1.7. Each of these key name printing parts 5Z
A plurality of movable contacts 52 each having a thickness of about 15 to 30 microns are lined up and formed by printing carbon ink or the like on the lower sides of the contacts. A frame-shaped display window printing section 53 forming a display window is printed on the lower surface of the top sheet 12 to face the display element 34 of the electronic component structure II, and a frame-shaped display window printing section 53 forming a battery window corresponding to the battery 43 is printed. Battery window printing part 54
is printed. Note that 55 in Figure 1 is a blind printing section. The upper sheet 13 is a rectangular sheet made of a synthetic resin having a thickness of about 180 μm and having excellent strength (toughness) K, such as hard vinyl chloride. As shown in FIG. 6, the upper sheet I3 has fixed contacts 24 and
A plurality of holes 56 that penetrate vertically corresponding to K are formed side by side, and holes 57 and 58 that penetrate vertically corresponding to one display element 34 and battery 43 are formed side by side. In addition, 59 in the figure indicates the integrated circuit element 2 of the substrate 2Z.
6. A hole for escaping the capacitor 30 and the light emitting diode 33. And this upper case I is the 10th case.
As shown in the figures to FIG. 13, the upper sheet 1
1# is bonded and laminated to form a multilayer structure, and the upper sheet 13 provides mechanical strength to the upper sheet Z2. The top sheet Z2 covers the entire top surface of the top sheet Z3, and the key name printed areas 5I of the top sheet 12 are hidden from above in correspondence with the holes 56 of the top sheet I3. ], each movable contact 52... is located in each hole 56...

Display window printing section 53 and battery window printing section 54 of the top sheet 12
is located on the upper side of the periphery of the holes 57, 5B of the upper sheet (upper sheet) Z, 9 and is blindfolded, and the transparent upper sheet portion surrounded by these printed parts 53, 54, that is, the display window and the battery window are It covers 5B and allows you to see through its inside. The blindfold 7 printed portion 55 of the top sheet Z2 covers the entire upper side of each hole 59 of the top sheet 13. The upper sheet 13 serves as a nullifier to separate the movable contacts 52 of the upper sheet 12 and the fixed contacts 24 of the substrate 2I and to maintain the switch operation interval.

The lower case 2 will be described with reference to FIGS. 7 and 8, and FIGS. 10 to 13. Lower case 2 has lower sheet Z4
and a lower sheet 15. Bottom sheet 1
4 is made of synthetic resin such as polyester film with a thickness of about 80 μm, and has a rectangular plate shape with excellent strength (toughness). As shown in FIG. It is formed by printing. Lower sheet I
5 is a rectangular sheet approximately 80μ thick made of synthetic resin with excellent strength (toughness) such as hard vinyl chloride.As shown in FIG. & Hole 62 for escaping the floor panel 4
is formed. As shown in FIGS. 10 to 13, the lower case 2 is made by laminating the lower sheet 15 on the upper side of the lower sheet 14 via an insulating adhesive 60 with a thickness of about 20 μm. 14 covers the entire lower surface of the lower sheet 15, and a blind printing part 6I covers and hides the hole 62 of the lower sheet 15 from below.

As shown in FIGS. 10 to 13, the upper case l is made by laminating the upper sheet I3 over the entire upper surface of the electronic component component rz and the frame I6 using an adhesive 60 with a thickness of approximately 20 μm. be.

Does the lower case 2 cover the entire lower surface of the electronic component component II and the frame 16? / -) 15 with adhesive 60 with a thickness of about 20μ
Glue and laminate [7]. The upper case I is a substrate 21 of the electronic component structure ZZ. Integrated circuit element 26. It supports and covers the capacitor 30, display element 341, and battery 43 from above. The lower case 2 has a board 21. The display element 34 and battery 43 are supported and covered from below. Here, as shown in FIG. 11, each hole 6 of the upper sheet 23 in the upper case I
6... are located so as to surround each fixed contact 24... of the board 21 on the upper side, and each movable contact 52... of the upper surface sheet I2...
is located above the fixed contact 24 through the hole 56. Key name printing section 57 on top sheet I2. An operation switch is configured by the movable contact 52, the hole 56 of the upper sheet ZJ, and the fixed contact 24 of the board 21, and the movable contact 52 is pressed by pressing the key name printed portion 5I of the upper sheet I2 from above.
1 through the hole 56 of the upper sheet 13. Press down on the board・2
It can be turned on by contacting the 11 fixed contacts 24. As shown in FIG. 12, the display element (liquid crystal panel) 34
is transmitted through the hole 57 of the upper sheet 13 in the upper case I to the surface [7] of the sheet 12 surrounded by the display window print part 53 of the upper sheet I2, that is, the display window, and displays the display by the display element 34. Upper case through the display window! Visible from the outside. As shown in Figure 13, the battery (solar cell) 4
3 is the top sheet 12 through the hole 58 of the top sheet I3.
The portion of the sheet 12 surrounded by the battery window printing portion 53, that is, faces the battery window, and can receive external light such as sunlight from outside the upper case I through the battery window. The display element 34 and the battery 43 are coated with, for example, ultraviolet curing ink 32 as a spacer and adhesive between their respective upper surfaces and the upper sheet Z2. In this embodiment, the case member is composed of the upper sheet 13, the lower case 2, and the frame 16. ) W middle school 694 provisional shipping α! Houki Mui.

Thus, by laminating the top sheet Z2 in close contact with the upper side of the electronic component structure II and laminating the sheet-shaped lower case 2 in close contact with the lower side of the electronic component structure 11 in this way, A compact electronic calculator is constructed that is entirely in the form of a single sheet. This small electronic calculator has a top sheet of 12 (80 μ), an adhesive of 6 o (20 μ), an upper sheet of J s (180 μ), and an adhesive of t; n (2
0μ)% Substrate 2I (300μ), Adhesive 60 (20μ
), lower sheet t s (80 μ), adhesive e o (
20μ)% bottom sheet Z4 (80μ) combination K,
Monotial is a very thin sheet with a total thickness of 800μ (0,811II). Each sheet 12.13, 14.1
5 and the substrate 21 shall have toughness with sufficient mechanical strength and elasticity for bending with a radius of curvature of about 40 degrees,
The small electronic calculator as a whole has excellent toughness. Similarly, the display element (liquid crystal panel) 34 and battery (solar cell) 43 of the electronic component structure 11 also have a radius of curvature of 40.
It has sufficient toughness to withstand bending at the same level. Also,
The small electronic calculator has a top sheet 12 and a bottom sheet 1.
4 constitutes the upper surface and the lower surface, and the upper surface sheet 1
In No. 2, the input key operation section is provided using the sheet, so the entire computer is flat and has no uneven parts, and is flat over the entire surface.

FIG. 19 shows another embodiment, in which the upper sheet 13 is not combined with the upper sheet Z2 in an integral structure, but the upper surface has a display window printing section (display window) 53 and an operation section 50. Only the sheet 12 is used as the upper case I.

When the top sheet Z2 is used together with the top case 1, a spacer for a switch may be provided on the lower side of the top sheet 12 in a corresponding part of the operating section 50, and in this case, the bottom case 2 is It is preferably made of thick and hard resin so that it can bulge out. FIG. 19 shows an example of this case, and 68 in the figure is a spacer. In this embodiment, the case member is composed of the lower case 21W and f1. Furthermore, instead of making the top sheet 12 thin as in the above-mentioned embodiments, the top sheet 12 can be made thick from hard vinyl chloride like the top sheet 13 to increase its own strength and be used alone as the top case I. I can do it. The 20th factor provides an example. In this case, the operation section of the top sheet Z2 is made thin only in that part, for example, so that it can be suppressed,
A spacer 68 may be provided on the lower side. In short, the upper case I basically only needs to be a single sheet having an operating section and a display window, and can also have a multilayer structure. The structure of the operating section is not limited to that of the embodiment, and the lower case 2 has a structure in which the lower sheet 14 and the lower sheet 15 are integrally laminated and combined in the seventh embodiment described above. Since it is laminated on the lower side of the component structure 11, it is also possible to use only one of the lower sheet 14 and the lower sheet I5 as the lower case 2 without combining the two sheets 14 and 15 together.

For example, as shown in FIGS. 19 and 20, the lower sheet I5 can be used alone as the lower case 2.

Further, although not shown, only the lower sheet I4 can be used as the lower case 2. Like this upper case l
As the lower case 2, individual sheets may be laminated in close contact with each other on the upper and lower sides of the electronic component structure IZ. The materials and thicknesses of the upper case I and the lower case 2 are also not limited to the examples.

In addition, in the embodiment described above, the upper case l and the lower case 2
Although a frame I6 is provided between the upper case I and the lower case 2, the frame I6 is not specially provided between the upper case I and the lower case 2. For example, as shown in FIGS. 19 and 20, the upper case I and the lower case 2 The electronic component structure II can be supported by the upper case I and the lower case 2 by sealing the peripheral edges of the electronic component assembly II to each other by direct adhesion or fusion. Further, a protrusion may be formed on the peripheral edge of either or both of the upper case I and the lower case 2.

Furthermore, in the electronic component structure II, for example, the substrate 2
1 is not limited to that of the embodiment, but may be divided into two pieces and electrically connected to each other as shown in FIG. In short, each component is electrically connected to form an electronic component structure. The battery is not limited to a solar cell, and a normal button-type battery may be used alone or in combination with a solar cell.

Note that the present invention is not limited to small electronic calculators, but can be widely applied to small electronic devices such as sheet-shaped electronic watches and electronic game machines.

〔Effect of the invention〕

As is clear from the above description, in the sheet-like small electronic device of the present invention, the upper side of electronic components such as integrated circuit elements, display elements, batteries, and substrates is formed from a resin film having a transparent display window and a key display section. At least the peripheral edge of the upper surface and the substrate are adhered to the case member that accommodates the various electronic components on the inner side. There is no need to use fastening members such as screws for attachment, and this has the effect that one strength can be maintained and the thickness can be reduced.

[Brief explanation of drawings]

1 to 18 show an embodiment of a small electronic calculator to which the present invention is applied. FIG. 1 is a perspective view showing the external appearance of the small electronic calculator, FIG. 2 is an exploded perspective view, and FIG. Figure 3 shows the electronic component structure (al is a plan view, (b)
is an exploded perspective view, FIG. 4 is a top plan view of the top sheet, FIG. 5 is a top plan view of the top sheet, FIG. 6 is a top view of the top sheet, FIG. 7 is a top view of the bottom sheet, and FIG. 8 is a top plan view of the top sheet. 9 is a plan view of the lower sheet, FIG. 9 is a plan view of the frame, FIGS. 10 to 13 are partial cross-sectional views of the small electronic calculator, and FIG. 14 is a cross-section showing the attachment portion between the integrated circuit element and the board. Figure, Figure 15 (a
l, (bl, (cl is a cross-sectional view showing the case where the chip capacitor is attached to the board, Fig. 16 fa),
(1) and (c) are cross-sectional views showing the case where the light emitting diode is attached to the substrate, respectively, and Fig. 17 (a) and (b)
) are cross-sectional views showing the case where the display element is attached to the board, respectively.
Figure 18 (al, (bl) is a cross-sectional view showing the case where the battery is attached to the board, Figures 19 and 20 are cross-sectional views showing other embodiments of the small electronic calculator, and Figure 21 is the electronic component. It is an exploded perspective view showing another example of a structure. !... Upper case, 2... Lower case, 11...
Electronic component constituent, 12...Top sheet, I3...Top sheet, I4...Bottom sheet, 15...Bottom sheet, I6...Frame % 2I...Substrate, 22...Copper foil ,
24...Fixed contact, 26...Integrated circuit element, 3θ・
...Capacitor, 33...Light emitting diode, 34...
- Display element (liquid crystal panel), 43... battery (solar cell). 50... Operation section, 5I... Key name printing section, 52.
... Movable contact, 53... Display window printing section, 54... Battery window printing section, 57-59... Hole section, 61... Blindfold printing section, 62... Hole section, 63...・Positioning hole. Figure 2 Figure 3 Figure 3 (a) (b) Figure 4 Figure 5 51 52 55 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 1 Figure 17 Figure 18 Figure 20 Figure 2221 36

Claims (1)

[Claims] A top sheet made of an elastic resin film provided with a display window and a key display section; a switch element disposed on the inner surface of the top sheet in correspondence with the key display section; a semiconductor integrated circuit element that performs calculations by turning on and off; a display element disposed on the inner surface of the top sheet in correspondence with the display window; and a display element that performs display based on signals from the integrated circuit element; a battery that supplies a driving voltage to an integrated circuit element; a conductive lead means for connecting the switch element, the integrated circuit element, the display element, and the battery to form a predetermined circuit; a substrate made of a flexible insulating film that supports at least a portion of the lead means; a case member that houses the integrated circuit element, the display element, the battery, and the substrate on its inner surface;
A sheet-like small electronic device comprising at least a peripheral portion of the top sheet and adhesive means for bonding the substrate to the case member.