JPH0520164U - Thin electronic devices - Google Patents

Abstract

(57) [Abstract] [Purpose] To eliminate the obstacles caused by static electricity and to easily manufacture thin electronic devices containing ICs and sheet batteries. In a thin electronic device including an IC and a sheet-shaped battery, an electrode of the sheet-shaped battery covers at least one surface of the IC. A carbon film formed by printing is preferable as an electrode of such a sheet-like battery.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a thin electronic machine in which the built-in IC has improved resistance to static electricity.

[0002]

[Prior Art]

 Thin electronic devices including an IC and a sheet-shaped battery are used as ID cards, tickets, tag cards and the like.

FIG. 3A is a plan view of the inside of such a thin electronic device, which has the function of a small radio transmitter / receiver and is used as an ID card. (B) is the XX sectional view. The thin electronic device shown in the figure has a structure in which an IC 1, an antenna 2, a battery 3 and a circuit 4 are resin-sealed in a structural plastic sheet substrate 5, and a protective decorative sheet 6 is adhered to the outer surface. Have In such a thin electronic device, when the antenna 2 receives an electromagnetic wave such as a microwave from the outside, the electromagnetic wave is modulated according to the unique information recorded in the small electronic device, and the external ID is transmitted from the antenna 2. It is sent to a receiving device such as a card reader.

However, when the IC 1 incorporating such a small electronic device is charged with static electricity above the electrostatic pressure resistance of the IC, problems such as malfunction of the IC and erasing of memory occur. For example, if you carry a small wireless transmitter / receiver on a dry day and walk on a synthetic resin carpet, the small wireless transmitter / receiver is generally charged with static electricity of about 15 KV, which is higher than the electrostatic pressure resistance. If not applied, the IC will malfunction.

Therefore, conventionally, as a measure against static electricity, a metal plate 7 made of aluminum or the like is mounted between the structural plastic sheet substrate 5 and the protective decorative sheet 6. As a result, static electricity is shielded from the IC by the metal plate 7, and the static electricity charged to the metal plate 7 is dispersed. Therefore, static electricity is not concentratedly charged to the IC section, and it is possible to reduce failures due to static electricity.

Alternatively, although not shown, the IC 1 may be covered with the electrodes of the battery 3 and a conductive shield film.

[0007]

[Problems to be solved by the device]

 However, if the outer surface of the structural plastic sheet substrate 5 is covered with a metal plate 7 made of aluminum or the like as in the conventional case, the damage to the IC due to static electricity is reduced but the transmission and reception of electromagnetic waves is also hindered. I can't wear 7. Therefore, in the conventional thin electronic device as shown in FIG. 2, there is a problem that static electricity cannot be effectively shielded. In addition, when the metal plate 7 is attached, the thickness of the thin electronic device increases, so that there is a problem in that the convenience of carrying the device is reduced.

On the other hand, when the IC 1 is covered with the electrodes of the battery 3 and the conductive shield film, the battery 3 is generally used by incorporating a completed button-type battery or a sheet-shaped battery. In order to form a conductive shield film, a separate shield film must be formed and circuits and contacts must be provided. Therefore, there is a problem that the manufacturing process of the thin electronic device becomes complicated.

The present invention is intended to solve the above-mentioned problems of the conventional technology, and an object thereof is to provide a thin electronic device in which a failure due to static electricity is eliminated and which can be easily manufactured.

[0010]

[Means for Solving the Problems]

 The present inventor has found that if the electrodes cover the IC when the electrodes of the sheet-shaped battery are formed, the IC can be easily shielded from static electricity without using a separate shield film of the IC. It came to eggplant.

That is, the present invention provides a thin electronic device including an IC and a sheet-shaped battery, wherein the electrode of the sheet-shaped battery covers at least one surface of the IC.

As the electrode of such a sheet-shaped battery, it is preferable to use a carbon film formed by printing a carbon paste on a base film of the sheet-shaped battery.

[0013]

[Action]

 In the thin electronic device of the present invention, since the electrode of the sheet-like battery covers at least one side of the IC, it functions as a shield film of the IC. Therefore, it becomes possible to shield static electricity from I C.

Further, the electrode for covering the IC can be manufactured without changing the manufacturing process of the conventional sheet-shaped battery, by simply forming the electrode surface so as to cover the IC when the electrode of the sheet-shaped battery is formed. In addition, this eliminates the need to separately attach a metal plate or a shield film for shielding static electricity, so that the manufacturing process of the thin electronic device can be simplified.

Furthermore, since the electrode of the sheet-shaped battery is composed of the electrode film printed on the substrate film, the thickness of the thin electronic device becomes smaller than that of the conventional thin electronic device using a metal plate for static electricity shielding, Since it also has excellent flexibility, portability is improved.

In particular, when a carbon film is used as an electrode of a sheet-shaped battery that covers the IC, it is possible to improve the resistance to static electricity with respect to the IC as well as the light shielding property, and further stabilize the electrode.

[0017]

【Example】

 An embodiment of a thin electronic device of the present invention will be specifically described below with reference to the drawings. In the drawings, the same reference numerals represent the same or equivalent constituent elements.

FIG. 1A is a plan view of the inside of a thin electronic device according to an embodiment of the present invention, and FIG. 1B is a sectional view taken along line XX of FIG. c) is the YY sectional view. Similar to the conventional thin electronic device shown in FIG. 3, the thin electronic device shown in the figure functions as a small radio transmitter / receiver, and has an IC 1, an antenna 2, a sheet battery 3 and a circuit 4. Although it has a structure in which a plastic sheet substrate 5 for resin is sealed with resin, this sheet-shaped battery 3 has two batteries 3A and 3B arranged in series. Is formed to cover the IC1.

Such a thin electronic device can be manufactured, for example, as shown in FIG.

That is, as shown in FIG. 2 (a), first, a carbon paste is screen-printed on the upper structural plastic sheet substrate 5 a and dried to form an electrode 31, and similarly, FIG. 2 (b). As described above, the electrodes 31 _A and 31 _B are also formed on the lower structural plastic sheet substrate 5b. As the upper and lower structural plastic sheet substrates 5a and 5b, an insulating film made of PET, PPS (polyphenylene sulfide), polyimide or the like can be used. In addition, the electrode 31 is preferably a carbon film in order to obtain excellent electrostatic resistance, light shielding properties, and stability as an electrode, and such a carbon film can be formed from a carbon paste. For example, it is preferable to use CH-1 (made by Jujo Kako) as the carbon pace. The electrode 31 may be formed using another conductive paste.

Next, as shown in FIG. 2C, the positive electrode active material 32 _A and the negative electrode active material 33 _B are screen-printed on the electrode 31 on the plastic sheet substrate 5a for the upper structure, and as shown in FIG. As shown in d), the negative electrode active material 33 _A is screen-printed on the electrode 31 _A and the positive electrode active material 32 _B is screen-printed on the electrode 31 _B on the lower structural plastic sheet substrate 5b. Here, as the positive electrode active material, for example, it can be used MnO ₂ paste comprising MnO _2, PV A and water, also as a negative electrode active material, using a Zn paste comprising Zn, PVA and water can do. Instead of printing the Zn paste as the negative electrode active material, sheet zinc may be laminated.

Next, as shown in FIG. 2 (e), on one of the structural plastic sheet substrates, for example, on the negative electrode active material 33 _A and the positive electrode active material 32 _B on the lower structural plastic sheet substrate 5b, respectively. separator 34 overlaying _a and separator 34 _B. As the separators 34 _A and 34 _B , for example, a Kraft paper impregnated with a ZnCl ₂ electrolytic solution can be used.

Although not shown, a predetermined circuit 4 is printed on the plastic sheet substrate 5b for the lower structure, and the IC 1 and the antenna 2 are mounted.

Next, as shown in FIG. 2F, the upper structure plastic sheet substrate 5a and the lower structure plastic sheet substrate 5b are superposed and resin-sealed, and the thin electronic device shown in FIG. To get

In the case of a thin electronic device formed in the same manner, in which the electrode surface 31 does not cover the IC 1 but the electrostatic pressure resistance is about 4 KV, the electrostatic resistance of the thin electronic device formed as in this embodiment is The pressure (when voltage is applied from the electrode surface 31 side) is about 7 KV, and the electrostatic pressure resistance is improved by about 75%. Further, in the thin electronic device of this embodiment, the light-shielding property is also improved, so that even if the IC portion of the thin electronic device is irradiated with strong light such as a photographic strobe, the IC will not be damaged.

In the above embodiment, the electrode surface 31 of the sheet-shaped battery 3 covers only one surface of the IC 1, but the electrode 31 _A or the electrode 31 _{B of the} sheet-shaped battery 3 is also covered. The IC 1 may be formed wide so that both surfaces of the IC 1 are covered with the electrode surfaces.

The thin electronic device of the present invention is a thin electronic device incorporating an IC and a sheet-shaped battery, and as long as the electrode of the sheet-shaped battery covers at least one side of the IC, There are no particular restrictions on the type or arrangement, and in addition to ICs and sheet batteries, members such as antennas can be incorporated. In addition, a protective decorative sheet can be attached to the outer surface of the thin electronic device, if necessary.

[0028]

[Effect of the device]

 According to the present invention, it is possible to obtain a thin electronic device in which a failure due to static electricity is eliminated by a simple manufacturing method.

[Brief description of drawings]

FIG. 1 is a plan view and a sectional view of a thin electronic device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a method for manufacturing a thin electronic device according to an embodiment of the present invention.

FIG. 3 is a plan view and a cross-sectional view of a conventional thin electronic device.

[Explanation of symbols]

1 IC 2 Antenna 3 Battery 4 Circuit 5, 5a, 5b Structural Plastic Sheet Substrate 6 Protective Decorative Sheet 7 Metal Plate 31, 31 _A , 31 _B Electrode 32 _A , 32 _B Positive Electrode Active Material 33 _A , 33 _B Negative Active Material 34 _A , 34 _B separator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Hishinuma 18 Satsuki Town, Kanuma City, Tochigi Prefecture Sony Chemical Corporation Kanuma Factory

Claims (2)

[Scope of utility model registration request] 1. A thin electronic device including an IC and a sheet-shaped battery, wherein the electrode of the sheet-shaped battery covers at least one surface of the IC. 2. The thin electronic device according to claim 1, wherein the electrode of the sheet-shaped battery that covers at least one surface of the IC is a carbon film formed by printing.