JPS6362015B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a small electronic device that is thin.

[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 small electronic calculators as an example, the goal for portable calculators is to be small and in the form of a thin sheet (card-like), like a credit card. That is, there is a demand for the development of a compact electronic computer that is as thin as a sheet.

However, this type of conventional small electronic calculator has a case made of a molded synthetic resin, or a combination of a metal plate and a wiring board, a display panel, etc. inside the case. Parts such as batteries are installed.

However, the case structure of such 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 the thickness of the entire case was limited to about 1.6 mm at its thinnest part. This has led to the problem that the case of a small electronic calculator 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 provides a small electronic device that maintains strength, is thinner, and has improved portability by having a structure in which the upper sheet member and the case member are bonded together. The purpose is to

[Summary of the invention]

In the small electronic device of the present invention, a display element and a solar cell are arranged on the side of a wiring board, and a see-through window and an electronic component structure are provided above an electronic component structure in which a display element and a solar cell are connected with a connecting material with adhesive strength. The upper case, in which the body storage section and the switch operation section are integrally formed, is stacked together, and the lower case is stacked on the bottom of the electronic component component, and these upper case, electronic component component, and lower case are bonded together with adhesive. It is characterized by the fact that

[Embodiments of the invention]

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

An embodiment in which the small electronic device of the present invention is applied to a small electronic calculator will be described. 1 to 18 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. FIG. 2 is an exploded view of a small electronic calculator. In this figure, 11 is an electronic component structure, 12 is a top sheet, 13 is an upper sheet, 14 is a bottom sheet, 15 is a bottom sheet, and 16 is an exploded view of a small electronic calculator.
is a frame. Each of these sheets 12, 13, 14,
15 and frame 16 each have a rectangular outer shape with the same size. Top sheet 12 and top sheet 13
are laminated in close contact with each other to constitute a sheet-shaped upper case 1, and a lower sheet 14 and a lower sheet 15 are laminated in close contact with each other to constitute a sheet-shaped lower case 2. The upper case 1 is laminated in close contact with the upper side of the electronic component structure 11, and the lower case 2 is laminated in close contact with the lower side of the electronic component structure 11. Note that the frame 16 is stacked closely between the upper case 1 and the lower case 2, and supports the electronic component structure 11 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. 10 to 13 are cross-sectional views showing the laminated structure, and FIG. 10 shows the boundary between the substrate and the frame (part A in FIG. 1),
Figure 11 shows the part where the operation switch is installed (Figure 1B
part), Figure 12 shows the part where the display element is installed (part C in Figure 1), and Figure 13 shows the part where the battery is installed (part D in Figure 1).
The cross sections of each part) are shown. Electronic component structure 1
1 will be described with reference to FIG. 3 and FIGS. 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. A copper foil 22 having a thickness of about 35 μm and forming a pattern is bonded with an insulating adhesive 23 having a thickness of about 20 μm. copper foil 22
The wiring patterns, which are conductive lead means formed on the upper and lower surfaces of the substrate 21, include wiring, contacts, and terminals, and each wiring pattern on the upper and lower surfaces includes through holes (not shown) formed at predetermined locations on the substrate 21. are connected via. The wiring pattern on the upper surface of the substrate 21 is schematically shown in FIG. 3, and connects fixed contacts, capacitors, display elements, batteries, light emitting diodes, etc. around the integrated circuit element. A plurality of fixed contacts 24, which are switch elements, are provided on one half of the upper surface of the substrate 21 as part of the wiring pattern.
... are arranged in a grid pattern, and the fixed contacts 24 consist of a pair of contacts, each of which 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 half of the board 21, a hole 25 is formed leaving the wiring pattern (copper foil 22 and adhesive 23) on the lower surface side, and a predetermined calculation is performed by turning on and off the switch element. A semiconductor integrated circuit element 26, that is, a large-scale integrated circuit (LSI) that performs In addition to connecting to the foil 22), silicone rubber,
The entire structure is sealed by being covered from above with an insulating resin 28 such as epoxy resin. The integrated circuit element 26 is made of a rectangular chip measuring, for example, 4 mm long x 4 mm wide x 200 μm thick, and is made of insulating resin 2.
8 is, for example, 10 mm long x 10 mm wide x 245 μm thick from the top surface of the integrated circuit. In the hole 29 formed in the other half of the board 21, leaving the wiring pattern (copper foil 22 and adhesive 23) on the lower surface,
Chip type capacitor 30 as shown in FIG.
The electrodes 30a formed at both ends of the capacitor 30 are bonded to the cream solder 31 applied to the hole 29, and the capacitor 30 is supported by the wiring pattern (copper foil) on the top side of the board 21. 2
2), and its surroundings are covered with an insulating adhesive 32, such as ultraviolet curing ink, applied to the upper surface of the substrate 21. 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. 16C. A light emitting diode 33 for power control is arranged, and the electrode 33a of the light emitting diode 33 is bonded to cream solder 31 applied to the substrate 21 and connected to the wiring pattern (copper foil 22) on the upper surface side of the substrate 21. Substrate 21
The periphery is sealed with an insulating adhesive 32 applied to the upper surface, such as ultraviolet curable ink. The light emitting diode 33 is connected to the integrated circuit element 26 via a wiring pattern. A display element 34, that is, a liquid crystal panel is arranged on one edge side of the substrate 21,
It is connected to the wiring pattern on the upper surface side of the board 21.
As shown in FIG. 17, the display element (liquid crystal panel) 34 is made of a transparent resin film such as polyester film with a polarizer layer therein, 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 sheet 38, and the lower electrode base 3
A reflector plate 39 with a thickness of about 50μ is placed on the bottom surface of 6 and a thickness of 15μ
It is attached using a certain amount of adhesive. Each electrode base 3 is provided on the upper surface of the protrusion of the lower electrode base 36.
A plurality of terminal electrodes 40 made of transparent conductive ink connected to electrodes 5 and 36 are arranged in the longitudinal direction. The 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. Further, on one side edge of the upper surface of the board 21, a plurality of terminals 41 are formed by extending the copper foil 22 of the wiring pattern and are arranged in the longitudinal direction.
It protrudes laterally from 1. Terminal electrode 40 of display element (liquid crystal panel) 34 and terminal 41 of substrate 21
are coated with a conductive adhesive 42, such as carbon ink, on their respective contact surfaces to adhere and electrically connect each other, and their surroundings are coated with an insulating adhesive 32, such as ultraviolet curable ink. It is attached. The display element 34 is connected to the integrated circuit element 26 via the wiring pattern of the substrate 21, and displays predetermined information based on a 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 21. As shown in FIG. 18, a battery (solar cell) 43 is constructed 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 with a thickness of about 25 μm, such as polyimide, and then forming an amorphous solar cell layer 46. 46
A polyester film 47 with a thickness of about 175 μm is coated thereon as a protective layer, and a pair of terminal electrodes 48 and 48 are formed on the upper surface of the metal substrate 44 via an insulating layer 45.
was formed. This battery (solar battery) 4
No. 3 has a total thickness of about 300μ and has elasticity (toughness) as a whole. Further, a pair of terminals 49, 49 are formed on one edge of the substrate 21 at a location facing the battery (solar cell) 43, with the copper foil 22 of the wiring pattern protruding laterally. Terminal electrode 48 of battery (solar cell) 43 and terminal 4 of substrate 21
9 are electrically connected by applying a conductive adhesive 42 such as carbon ink and adhering them to each other, and the periphery thereof is covered with an insulating adhesive 32 such as ultraviolet curable ink. Therefore, the battery (solar cell) 43 is connected to the integrated circuit element 26 via the wiring pattern of the substrate 21.

The electronic component assembly 11 configured in this manner is placed inside the frame 16. The frame 16 is made of, for example, hard vinyl chloride and has a thickness of about 300μ, and has a rectangular frame shape as shown in FIG. Depending on the arrangement, it has a shape that runs along and surrounds the periphery of the component. The frame 16 is arranged around the electronic component structure 11 to surround it, as shown in FIGS. 3, 10, 12, and 13.

The upper case 1 will be described with reference to FIGS. 4 to 6 and 10 to 13. The upper case 1 is a combination of a top sheet 12 and an upper sheet 13. The top sheet 12 is a rectangular sheet with excellent strength (toughness) made of a transparent resin sheet such as a polyester film with a thickness of about 80 μm, and has an electronic component configuration as shown in FIGS. 4 and 5. An operating section 50 is provided at a location corresponding to the fixed contact forming section of the substrate 21 of the body 11. This operation unit 50 has a plurality of key name printing units 5 on the bottom surface of the top sheet 12 corresponding to each fixed contact 24 of the board 21.
1... are printed in a grid pattern, and a thickness of 15 to 30 μm is printed corresponding to the lower side of each key name printing area 51...
It is formed by arranging a plurality of movable contacts 52 of about 100 mL and printing carbon ink or the like. 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 11, and a frame-shaped display window printing section 53 forming a battery window corresponding to the battery 43 is printed. A battery window printed portion 54 is printed. In addition, numeral 55 in the figure is a blind printing section. The upper sheet 13 is a rectangular sheet made of a synthetic resin having excellent strength (toughness) and having a thickness of about 180 μm, such as hard vinyl chloride. As shown in FIG. 6, a plurality of holes 56 are formed side by side in the upper sheet 13 to correspond to the fixed contacts 24 of the substrate 21, and which penetrate vertically, and correspond to the display element 34 and the battery 43, respectively. Holes 57 and 58 are formed side by side, penetrating vertically. Note that 59 in the figure is a hole for allowing the integrated circuit element 26, capacitor 30, and light emitting diode 33 of the substrate 21 to escape. This upper case 1 is the 10th case.
As shown in the figures to FIG. 13, the upper sheet 13 is bonded and laminated to the lower side of the upper sheet 12 via an insulating adhesive 60 with a thickness of approximately 20 μm. The upper sheet 13 provides mechanical strength. Top sheet 1
2 covers the entire upper surface of the upper sheet 13, and the key name printed portions 51 of the upper sheet 12 are hidden from above in correspondence with the holes 56 of the upper sheet 13, and the movable contacts 52 are hidden from the upper side. It is located in each hole 56... Display window printing section 53 on top sheet 12
and the battery window printing portion 54 are located in the hole portion 5 of the upper sheet 13.
The transparent upper sheet portion, that is, the display window and the battery window surrounded by the printed parts 53 and 54, is located above the periphery of the holes 57 and 58, and is hidden by the holes 57 and 58.
8 can be covered and the inside can be seen through. Top sheet 1
The second blind printing part 55 covers the entire upper side of each hole part 59 of the upper sheet 13. Note that the upper sheet 13 is connected to the movable contacts 52 of the upper sheet 12 and the substrate 2.
It serves as a spacer to separate the first fixed contact 24 and maintain the switch operation interval.

The lower case 2 will be described with reference to FIGS. 7 and 8, and FIGS. 10 to 13. The lower case 2 is a combination of a lower sheet 14 and a lower sheet 15. The bottom sheet 14 is made of synthetic resin such as polyester film with a thickness of about 80μ, and has a rectangular sheet shape with excellent strength (toughness).As shown in FIG. 6
1 is formed by printing. Lower sheet 15
is a rectangular sheet approximately 80μ thick made of synthetic resin with excellent strength (toughness) such as hard vinyl chloride, and as shown in FIG. A hole 62 for escaping the hole 34 is formed. The lower sheet 2 has a lower sheet 15 on the upper side of the lower sheet 14, as shown in FIGS. 10 to 13.
The lower sheet 14 is bonded and laminated with an insulating adhesive 60 of about 20 μm in thickness, and the lower sheet 15
A blind printing part 61 covers the entire lower surface of the lower sheet 15 to cover and hide the hole part 62 of the lower sheet 15 from below.

The upper case 1 is shown in FIGS. 10 to 13.
As shown in the figure, the upper sheet 13 is bonded and laminated on the entire upper surface of the electronic component structure 11 and the frame 16 with an adhesive 60 having a thickness of about 20 μm. Lower case 2
The lower sheet 15 is bonded and laminated on the entire lower surface of the electronic component structure 11 and the frame 16 with an adhesive 60 having a thickness of about 20 μm. The upper case 1 supports and covers the substrate 21, integrated circuit element 26, capacitor 30, display element 34, and battery 43 of the electronic component assembly 11 from above. The lower case 2 includes a substrate 21 and a display element 3
4. Support the battery 43 from below and cover it. Here, as shown in FIG. 11, each hole 56 of the upper sheet 13 in the upper case 1 is positioned so as to surround each fixed contact 24 of the board 21 on the upper side, and each movable contact 52 of the upper sheet 12 is positioned so as to surround each fixed contact 24 of the board 21 on the upper side. are located above the fixed contacts 24 through the holes 56. Top sheet 1
2, the key name printed part 51, the movable contact 52, the hole 56 of the upper sheet 13, and the fixed contact 24 of the board 21 constitute an operation switch.The key name printed part 51 of the upper sheet 12 is pressed from above to open the movable contact. 52 through the hole 56 of the upper sheet 13 and press down the substrate 21
It can be turned on by contacting the fixed contact 24 of. As shown in FIG.
It faces the portion of the sheet 12 surrounded by the display window print section 53 of the top sheet 12, that is, the display window, through the hole 57, and the display by the display element 34 can be viewed from outside the top sheet 1 through the display window. 1st
As shown in FIG. 3, the battery (solar cell) 43 faces the portion of the sheet 12 surrounded by the battery window printed portion 53 of the top sheet 12, that is, the battery window, through the hole 58 of the top sheet 13. Through the upper case 1, external light such as sunlight can be received from the outside of the upper case 1. Note that, for example, ultraviolet curable ink 32 is applied as a spacer and adhesive between the upper surface of the display element 34 and the battery 43 and the upper sheet 12, respectively. In addition, in this example, the upper sheet 1
3. The lower case 2 and the frame 16 constitute a case member. In the figure, 63 is a positioning hole used during manufacturing.

In this way, the electronic component structure 11
A small electronic calculator that is formed into an integrated sheet by laminating a top sheet 12 closely on the upper side and laminating a lower case 2 in a sheet shape on the lower side of an electronic component structure 11. is configured. This small electronic calculator has a top sheet 12
(80μ), adhesive 60 (20μ), top sheet 13
(180μ), adhesive 60 (20μ), substrate 21 (300μ),
The combination of adhesive 60 (20μ), lower sheet 15 (80μ), adhesive 60 (20μ), and lower sheet 14 (80μ) forms a very thin sheet with a total thickness of 800μ (0.8mm). . Each sheet 12, 13,
14, 15 and the substrate 21 have sufficient mechanical strength and elasticity to withstand bending with a radius of curvature of about 40 mm, and the small electronic calculator as a whole has excellent toughness. The display element (liquid crystal panel) 34 and battery (solar cell) 43 of the electronic component structure 11 similarly have sufficient toughness against bending with a radius of curvature of about 40 mm. In addition, the small electronic calculator has an upper surface and a lower surface composed of a top sheet 12 and a bottom sheet 14, and the top sheet 12 is used to provide an input key operation section, so the entire calculator is flat and has no uneven surfaces. There are no parts and the entire surface is flat.

FIG. 19 shows another embodiment that is directly related to the gist of the present invention. In this case, the top sheet 12
For example, the operation part may be made thin in only that part so that it can be operated by pressing, and a spacer 68 may be provided on the lower side. In short, the upper case 1 basically has only to be a single sheet having an operating section, a display window, and a storage section for storing electronic components, and can also have a multilayer structure. The configuration of the operating section is also not limited to the embodiment. Further, in the above-described embodiment, the lower case 2 has a structure in which the lower sheet 14 and the lower sheet 15 are integrally laminated and combined, but the lower case 2 is laminated below the electronic component structure 11. Therefore, it is also possible to use only one of the lower sheet 14 and the lower sheet 15 as the lower case 2 without combining the two sheets 14 and 15 together. For example, as shown in FIG. 19, the lower sheet 15 can be used alone as the lower case 2. Further, although not shown, only the lower sheet 14 can be used as the lower case 2. In this way, the upper case 1 and the lower case 2 can be constructed by laminating individual sheets in close contact with each other on the upper and lower sides of the electronic component structure 11, respectively.
The materials and thicknesses of the upper case 1 and lower case 2 are also not limited to the examples.

Further, in the embodiment described above, the frame 16 is provided between the upper case 1 and the lower case 2, but the frame 16 is not specially provided between the upper case 1 and the lower case 2, for example, as shown in FIG. Upper case 1 as shown
The peripheral edges of the upper case 1 and the lower case 2 are sealed to each other by direct adhesion or fusion, so that the electronic component structure 11 can be supported by the upper case 1 and the lower case 2. In addition, upper case 1 and lower case 2
It is also possible to form a protrusion on the peripheral edge of one or both of the above.

Furthermore, in the electronic component structure 11, the substrate 21 is not limited to that of the embodiment, but the 20th
As shown in the figure, it may be divided into two pieces and electrically connected to each other. In short, each component is electrically connected to form an electronic component structure.

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 explained above, according to the small electronic device of the present invention, a see-through window, an electronic component housing portion and a An upper case integrally formed with a switch operation part is laminated, a lower case is laminated below the electronic component structure, and these upper case, electronic component structure, and lower case are bonded together with adhesive. Therefore, it is not necessary to use fastening members such as screws to attach each case and the electronic component structure, and therefore, it is possible to achieve the effect that the thickness can be reduced while maintaining strength.

In addition, since the electronic component structure has a display element and a solar cell arranged on the side of the wiring board,
The space required to place each component has been made thinner, contributing to the overall thickness of the device.

[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, where a is a plan view, b is an exploded perspective view, Figure 4 is a top plan view of the top sheet, Figure 5 is a bottom plan view of the top sheet, and Figure 6 is the upper part. A plan view of the seat, FIG. 7 is a plan view of the lower sheet, FIG. 8 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, FIG. 14 is a cross-sectional view showing the mounting portion between the integrated circuit element and the board, and FIG. 15 a, b, c are cross-sectional views showing the case where the chip capacitor is attached to the board, Fig. 16a,
b, c are cross-sectional views showing the case where the light emitting diode is attached to the substrate, respectively, Fig. 17 a, b are cross-sectional views respectively showing the case where the display element is attached to the substrate, and Fig. 18 a, b are the respective cross-sectional views showing the case where the battery is attached to the substrate. FIG. 19 is a sectional view showing another embodiment of the small electronic calculator, and FIG. 20 is an exploded perspective view showing another embodiment of the electronic component structure. DESCRIPTION OF SYMBOLS 1... Upper case, 2... Lower case, 11... Electronic component structure, 12... Upper sheet, 13... Upper sheet, 14... Lower sheet, 15... Lower sheet, 16
...Frame, 21...Substrate, 22...Copper foil, 24...Fixed contact, 26...Integrated circuit element, 30...Capacitor, 3
3...Light emitting diode, 34...Display element (liquid crystal panel), 43...Battery (solar cell), 50...Operation unit, 5
DESCRIPTION OF SYMBOLS 1... Key name printing part, 52... Movable contact, 53... Display window printing part, 54... Battery window printing part, 57-59... Hole part, 61... Blindfold printing part, 62... Hole part, 63... Positioning hole.

Claims (1)

[Scope of Claims] 1. A wiring board having a switch element that is turned on and off by external operation and a semiconductor integrated circuit element that performs calculations by turning on and off the switch element, and displays arranged side by side on the wiring board. an electronic component structure including an element and a solar cell, each connecting portion of the display element, the solar cell, and the wiring board being electrically connected by a connecting material having adhesive strength; the display element and the solar cell; A see-through window facing the electronic component structure, a storage section for storing the electronic component structure, and an operation section for turning on and off the switch element are all integrally formed, and are laminated in close contact with the upper side of the electronic component structure. an upper case laminated in close contact with the lower side of the electronic component structure; A small electronic device characterized by being bonded.