JPH0658797B2 - Small electronic devices - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a small electronic device including an integrated circuit chip and a power supply battery for supplying electric power to the circuit.

[Technical background of the invention and its problems]

2. Description of the Related Art Recently, as a small electronic device such as a small electronic calculator generally called a calculator, one using a solar battery as a power supply battery has come to be seen. Small electronic devices that use this solar cell as a power battery have a solar cell thickness of approximately 20
Since it is very thin, about 0μ, it is a button type battery (mercury battery,
It can be made much thinner than a small electronic device using a silver oxide battery, a lithium battery, etc.) as a power battery. As a small electronic calculator, there is an ultra-thin computer called a card-type calculator.

However, in a small electronic device having a memory function, a clock function, etc., when a solar cell is used as a power supply battery, the memory circuit of the integrated circuit chip is used when the solar cell cannot receive a sufficient amount of light at night and stops power generation. The power supplied to the clock circuit, clock circuit, etc. runs out, and the memory cannot be retained, or the clock function is stopped. Button batteries have to be used as the power source battery, and therefore, this type of small electronic device cannot be made thinner due to the thickness of the battery, so it was considerably thicker than that using solar cells. .

Therefore, in recent years, a paper-type battery has been developed as a power supply battery to reduce the thickness.

The paper-like battery has film-shaped electrodes on the upper surface and the lower surface thereof, and the power supply terminals of the wiring board of the integrated circuit chip are connected to these electrodes through a pair of connecting members.

However, in the past, since a pair of electrode terminal plates were connected to both electrodes of a paper-like battery while sandwiching the electrode terminal plates from above and below in the thickness direction of the battery, the pair of electrode terminal plates were spaced in the thickness direction. Therefore, there is a drawback that the thickness cannot be sufficiently reduced.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and an object thereof is to achieve a sufficiently thin connection between a connecting member for a power supply battery and a paper-like battery without taking a space in a thickness direction. It is to provide a small electronic device that can be realized.

[Outline of Invention]

According to the present invention, in order to achieve the above object, both electrodes of a paper-like battery are respectively extended to a side surface portion, and an elastic connecting member connected to a power supply terminal of a wiring board is brought into contact with the extended portion. Is.

Example of Invention

An embodiment of the present invention will be described below with reference to the drawings by taking a small electronic calculator generally called a calculator as an example.

FIG. 2 shows the external appearance of the small electronic calculator, and FIG. 3 shows the cross section of the battery housing portion. 2 and 3, reference numeral 10 in the drawings is a device case of a small electronic calculator, and this case 10 includes a frame body 11 having an shape as shown in FIG. 1, an upper sheet 12, an upper sheet 13, and a lower portion. The sheet 14 and the lower surface sheet 15 are laminated.

In the device case 10, a wiring board 20 having a shape as shown in FIG. 1, an ultra-thin display panel (for example, a liquid crystal display panel) 30, and a paper-like battery 40 are arranged. A spacer 50 made of a synthetic resin film having substantially the same outer shape as the wiring board 20 is superposed on the upper surface of the wiring board 20.

The wiring board 20 has a large-scale integrated circuit chip (hereinafter, LS).
An I chip) 21 and chip parts 22 and 22 such as a chip capacitor are attached. Further, on the upper surface of the wiring board 20, a large number of split fixed contacts, each of which includes a pair of contacts 23a and 23b. 23 ... Are arrayed. The LSI chip and the chip components 22 and 22 are fitted in through holes formed in the wiring board 20 to form the wiring board 20.
It is installed with a small protruding height to the top.

Further, the spacer 50 is provided with a large number of openings 51, ... Corresponding to the fixed contacts 23 ,.
2, 22 are provided with through holes 52, 53 which serve as escapes for the protruding portions on the wiring board 20, and the spacer 50 has the through holes 52, 53 in which the LSI chip 21 and the chip components 22, 22 are provided. And is adhered onto the wiring board 20.

The wiring board 20 and the spacer 50 serve as the case 10
It is fitted in the frame body 11.

The frame body 11 is formed by punching out a thin metal plate such as stainless steel. The inside of the frame body 11 is the wiring board 2
It is divided into a storage space A of 0, a display panel storage space B, and a battery storage space C, and the display panel 30 is fitted into the display panel storage space B of the frame body 11 side of the wiring board 20. Is arranged side by side with the wiring board 20, and is connected to the display panel connection terminals 24, ... Arranged and formed on the lower surface of one end edge of the wiring board 20 by a film-like heat seal connector 31.

Further, the paper-like battery 40 is fitted into the battery housing space C of the frame body 11 and is arranged side by side with the wiring board 20. The electrodes of the upper and lower surfaces of the paper-like battery 40 are arranged. The (negative electrode and positive electrode) are connected to the battery connecting terminals 25, 25 formed on one side edge of the wiring board 20 by a pair of power supply connecting members 60a, 60b which contact these electrodes.

In addition, the upper sheet 12 and the lower sheet 1 of the case 10
4 is made of a metal sheet such as stainless steel or beryllium steel, and the upper sheet 12 has an opening 1 that matches the openings 51, 51 provided in the spacer 50.
21 and 121 and a fitting hole 122 into which the upper portion of the display panel 30 is fitted, and the upper sheet 12
The lower surface of the LSI chip 21 and the chip component 22,
The recessed portions 123 and 124 for receiving the portions of the spacer 22 projecting above the spacer 50 are formed by harvesting.

The lower surface of the upper sheet 12 is the frame 1
1 is adhered to the upper surface of 1 to be integrated with the frame body 11, the spacer 50 is adhered to the lower surface of the upper sheet 12,
The lower sheet 14 is bonded to the lower surface of the frame body 11.

The lower sheet 14 is adhered by attaching the upper sheet 12 to the frame body 11, adhering the spacer 50 to the lower surface of the upper sheet 12, and then connecting the display panel 30 to the lower surface of the spacer 50 in advance. Wiring board 2
0 is adhered, the display panel 30 and the paper-like battery 40 are fitted into the frame 11, and the filler 1 except the battery storage space C is inserted into the frame 11 from the lower surface side of the wiring board 20.
After filling with 6. The filling material 16 positions and fixes the LSI chip 21 and the chip components 22 and 22 attached to the wiring board 20 (they slightly project to the lower surface of the wiring board 20) and the display panel 30. As the filling material 16, a quick-drying liquid adhesive that cures at room temperature (for example, an acrylic or epoxy two-component mixed adhesive) is used, and the liquid adhesive is the lower surface of the wiring board 20. Is dropped and filled. The lower sheet 14 is adhered immediately after the liquid adhesive is dropped. Therefore, the lower sheet 14 is adhered not only to the frame 11 but also to the wiring board 20 via the filler 16.

Further, the frame 11, the upper sheet 12, and the lower sheet 1
The outer peripheral surface of the case body formed by adhering 4 and 4 is covered with the outer coating 17 in consideration of the case where the airtightness of the adhering surfaces of the frame 11 and the upper and lower sheets 12 and 14 is not perfect. There is.
The outer coating 17 is formed by applying an adhesive of the same type as the liquid adhesive used for the filling material 16 to the outer peripheral surface of the case body and curing the same.
The outer peripheral surface of is finished by curing the adhesive and then cutting the outer peripheral portion.

On the other hand, the top sheet 13 and the bottom sheet 1 of the case 10
Reference numeral 5 denotes a synthetic resin sheet, which are adhered to the surfaces of the upper sheet 12 and the lower sheet 14, respectively.

Further, the upper surface sheet 13 has numbers, letters, symbols, etc. 131 indicating the operation portion printed on the lower surface of the transparent resin sheet, and an opaque paint is printed on the entire lower surface of the sheet except for the portion to be the display window 132. The display panel 30
Is adhered to the lower surface of the display window 132 of the upper sheet 13 with a transparent adhesive. And this top sheet 1
3, the openings 12 of the upper sheet 12 are formed on the lower surface of the portion on which the numbers, letters, symbols, etc. 131 of FIG.
Contact seats 133 that enter 1, ... Are formed by means such as thick film screen printing of an adhesive.
A movable contact 134 formed by printing carbon ink or the like is adhered to the lower surface of 3. This movable contact 134
Is pressed by a finger to elastically deform downward on the operation portion (the portion on which numbers, characters, symbols 131, ... Are printed) of the upper sheet 13 so that the switch fixed contact 23 on the surface of the wiring board 20 is pressed. A pair of contacts 23a and 23b that are pressed against the switch to form the switch fixed contact 23 are short-circuited, and the movable contact 134 and the fixed contact 23 constitute an operation switch.

Next, the paper-like battery 40 will be described. The paper-like battery 40 is specially devised so that the entire thickness can be made extremely thin and can be curved to some extent. 40 is the fourth
The configuration is as shown in the figure.

That is, the paper-like battery 40 includes an electromotive unit 42 between a pair of flat film-like electrode plates 41a and 41b made of a conductive metal thin film such as aluminum or stainless steel, and the pair of electrode plates, that is, the negative electrode. The plate 41a and the positive electrode plate 41b are adhered at their outer peripheral portions with a heat-fusible sealing material (inorganic and organic composite material) 46 to seal the periphery of the electromotive unit 42.

The electromotive unit 42 is formed by stacking a negative electrode active material 43 made of metallic lithium and a positive electrode active material 44 made of manganese dioxide with a separator 45 made of polypropylene non-woven fabric impregnated with an organic electrolytic solution sandwiched therebetween. The positive electrode active material 44 is printed on the inner surface of the positive electrode plate 41b.
Is in close contact with the inner surface of the negative electrode plate 41a.

As described above, in the paper-like battery 40, the film-like negative electrode plate 41a and the positive electrode plate 41b are used also as the battery exterior body, and the periphery of the electromotive unit 42 is surrounded by the negative electrode plate 41a.
Since the positive electrode plate 41b and the positive electrode plate 41b are sealed by bonding with the heat-fusible sealing material 46, the thickness is very thin and flexible enough to be bent to some extent.

The encapsulant 46 provided on the paper-like battery 40 is formed such that one side surface thereof projects slightly outward and a part of the negative electrode plate 41a and the positive electrode plate 41b is formed on one side surface portion of the paper-like battery 40, respectively. It is extended to the protruding portion of the sealing material 46 formed on the. It has extension parts 41a 'and 41b', and these extension parts 41a 'and 41b' are adhered to the upper sealing material 46 which is further rotated to the back surface side. The power source terminal springs 60a and 60b are brought into contact with the extending portions 41a 'and 41b', respectively, as described later.

Further, as can be understood with reference to FIG.
1a 'is arranged in the immediate vicinity of one side edge 40a' of the paper-like battery 40, and the width of this extension 41a 'is about half the length of the center line of the paper-like battery 40 and one side edge 40a'. It Further, the extension portion 41b 'is formed in the paper battery 4
It is provided from the vicinity of the center line of 0 in the longitudinal direction toward the other side edge 40b 'facing the one side edge 40a', and the width thereof is about half the length of the other side edge 40b 'from the center line. .
Therefore, when the paper battery 40 is mounted upside down, in other words, when the one side edge 40a 'is mounted at the position of the other side edge 40b', the extending portions 41a ', 41b' are provided.
Between the other side edge 40b 'and the extending portion 41b',
Since they are arranged between the extending portion 41a 'and the extending portion 41b', the respective arrangement positions are displaced from the case where they are properly mounted.

The principle of electromotive force of the paper battery 40 is basically the same as that of the well-known button type lithium battery, and the description thereof will be omitted.

Explaining the thickness of the paper battery 40, the electromotive unit 42 has a thickness of 350 μ (the negative electrode active material 43 has a thickness of 50 to 80 μ, and the positive electrode active material 44 has a thickness of 150 to 1).
80 μ, the thickness of the separator 45 is 100 to 150 μ),
The thickness of each of the negative electrode plate 41a and the positive electrode plate 41b is 50μ, and the total battery thickness is 450μ (0.45mm), which is the thinnest button type lithium battery (thickness 1.6mm) among the commercially available button type batteries. ) Is much thinner than.

In this embodiment, as the paper-like battery 40, a rectangular one having a plane size of about 34 mm × 17 mm is used, and the paper-like battery 40 has a weight of 0.7 g and a discharge capacity of 17 mA.

The power supply terminal springs 60a and 60b are formed by metal spring members, and one end portions of the power supply terminal springs 60a and 60b are cutout portions 20a and 20b formed on one side of the wiring board 20, respectively.
Is connected to the power supply connecting terminals 25, 25 by being soldered. The power supply terminal spring 60a has a length dimension larger than that of the other terminal spring 60b, and the other ends of the terminal springs 60a and 60b are introduced into the battery storage space C, and each electrode of the paper-like battery 40 is introduced. It is provided so as to come into contact with the respective extended portions 41a ', 41b' of 41a, 41b.

On the other hand, in FIG. 1 and FIG. 3, 18 is a device case 1
It is a slit-shaped battery exchange port provided on the lower surface of 0 corresponding to one end of the battery storage space C, and the paper-type battery 40 is exchanged from this battery exchange port 18.

The battery replacement port 18 is used for the lower sheet 1 of the device case 10.
4 and the lower surface sheet 15 are provided with slit-shaped openings 18a and 18b having a width slightly larger than the thickness of the paper-shaped battery 40 and slightly longer than the width of the paper-shaped battery 40. It is formed slightly larger than the opening 18a of the lower sheet 14.

Reference numeral 80 denotes a lid sheet that covers the battery replacement port 18 of the device case 10. The lid sheet 80 is the lower sheet 15
The opening 18a of the upper sheet 14 is attached to the adhesive surface of a single-sided adhesive tape (a synthetic resin film coated with a viscous adhesive) on the entire surface of the opening 18b.
With a metal sheet 82 of a size that fits in
An outer peripheral portion of the adhesive tape 81 (a portion protruding around the metal sheet 82) is a device case adhesive portion.

The lid sheet 80 has a periphery, that is, an adhesive tape 81.
The outer peripheral portion of the lower sheet 14 at the periphery of the opening (lower sheet 1
5 is attached to the lower surface of a portion (projecting inward from the opening 18b) of the device 5 to be attached to the device case 10 so as to cover the battery exchange port 18, and the adhesive tape 81
Is approximately the same thickness as the lower surface sheet 15 of the device case 10, and the metal sheet 82 is approximately the same thickness as the lower sheet 14.

6 to 8 show a method of loading the paper-like battery 40 into the battery storage space C in the device case 10,
The paper-like battery 40 is loaded by inserting the paper-like battery 40 into the battery exchange port 18 from one end side thereof as shown in FIG. 6 and bending the paper-like battery 40 as shown in FIG. It is carried out by pushing it into C and finally fitting the paper battery 40 into the battery storage space C as shown in FIG. In this case, when the paper battery 40 is pushed into the battery storage space C,
It comes into contact with the power supply terminal springs 60a, 60b in the battery storage space C, enters the battery storage space C while elastically deforming the terminal springs 60a, 60b, and finally, as shown in FIG. Extending portions 41a 'of 41a and 41b,
41b 'is brought into contact with the power supply terminal springs 60a and 60b. At this time, the paper-like battery 40 is connected to the power supply terminal spring 6
0a and 60b are pressed against the inner surface of one side portion of the frame body 11 by the elastic force, and the terminal springs 60a and 60b and the extending portion 41 are provided.
The contact with the a'and 41b 'is reliably retained.

After that, the lid sheet 80 may close the battery replacement port 18.

When replacing the paper-like battery 40, the lid sheet 80 is peeled off, the end of the paper-like battery 40 is pulled up, and the paper-like battery 40 is bent while the device case 10 is being bent.
It is sufficient to pull it out, then load a new paper-like battery in the same manner as above, and adhere the lid sheet 80 to the battery replacement port 18 again.

If the adhesive force of the adhesive tape 81 on the lid sheet 80 is weakened due to repeated battery replacement, only the lid sheet 80 or its adhesive tape 81 may be replaced with a new one.

Further, the paper battery 40 is arranged in the opposite direction (extension part 41a ′,
It is needless to say that the power source terminal springs 60a and 60b are not electrically connected even when they are inserted into the battery exchange port 18 from the direction in which the side portion facing 41b 'is the front end), but the extension portion 4 is turned upside down.
Even when 1a 'and 41b' are inserted from the battery exchange port 18 with the front end side, as described above, the extending portions 41a 'and 41b'
Since b'is arranged at a position displaced from the position when it is properly inserted, the terminal springs 60a and 60b do not come into contact with it, and it is possible to prevent the occurrence of abnormality during reverse insertion.

Therefore, in this small electronic computer, the power supply terminal springs 60a and 60b are not provided in the thickness direction of the paper-like battery 40, and both electrodes 41 of the paper-like battery 40 are provided.
a and 41b are extended to one side surface of the paper battery 40,
A power source terminal spring 60 is attached to the extending portions 41a 'and 41b'.
Since a and 60b are brought into contact with each other, the entire device can be made extremely thin.

In the above-mentioned embodiment, the conductive lead spring 60 is used.
Although the case where a and 60b are fixed to the wiring board 20 has been described, this may be fixed to the exterior cover of the device, the internal frame, or the sheet-shaped material. Further, it is not limited to a leaf spring, but a coiled spring or a flexible film connector can be provided by providing a cushion member as a separate member, in short, an elastic contact from the side surface of the paper battery. If it is good. In this case, these power supply connecting members do not come in contact with each other from the same side of the paper-like battery,
You may make it contact with one electrode from the other side surface.

In addition, although the small electronic calculator has been described in the above embodiment, the present invention is not limited to the small electronic calculator, and can be widely applied to electronic game machines having a clock function and other small electronic devices. Lower surface sheet 1 of device case 10
LSO2 by forming an embossed character with a height of about 0.48 mm on 5
It can be used as a credit card with embossed characters defined by 894, or can be used as a magnetic credit card by providing a striped magnetic recording portion on the surface of the device case 10.

Furthermore, according to the present invention, a card-type small electronic device (an integrated circuit chip having a microcomputer function, a program memory function and a data memory function) having the same size and thickness as a credit card generally called an IC card is provided. However, an IC card having a built-in memory backup power supply can also be obtained by incorporating a power supply battery into a device that is operated by being supplied with power from an external power supply during use).

〔The invention's effect〕

As described above, according to the present invention, both electrodes of the paper-like battery are extended to the side surface of the paper-like battery, and the extending portions are brought into contact with the power supply connecting member connected to the power supply terminal. The member does not occupy a space in the thickness direction of the paper-like battery, and the thickness of the device can be sufficiently thinned.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is an exploded perspective view of a small electronic computer, FIG. 2 is an outer perspective view thereof, and FIG.
FIG. 4 is a cross-sectional view taken along line III-III in FIG. 2, FIG. 4 is a side view showing a paper battery in a partially cutaway view, and FIG. 5 shows a contact state between a connecting member and an electrode of the paper battery. The plan views shown in FIGS. 6 to 8 are perspective views showing a method of loading the paper-like battery. 20 ... Wiring board, 25, 26 ... Battery terminal, 41a,
41b ... paper-like electrodes, 41a ', 41b' ... extension parts, 60a, 60b ... power source terminal springs (connection members).

Claims (1)

[Claims] 1. A small electronic device including a power supply battery connected to a power supply terminal of a wiring board, wherein a paper-like battery provided with an electromotive unit between a pair of film-like electrodes is used as the power supply battery. A small-sized electronic device, wherein the both electrodes of the battery are respectively extended to the side surface portions of the paper-like battery, and the elastic connecting members connected to the power supply terminals are brought into contact with the extended portions.