JPS63249697A - Thin type electronic equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (II Field of Industrial Application) The present invention relates to a thin electronic device, and more specifically, it is capable of mounting more functional elements than ever before, and has an external The present invention relates to a thin electronic device having a novel structure that has excellent resistance to stress from external forces and can increase battery capacity despite being thin.

(Prior Art) In recent years, thin electronic devices such as card-type calculators and IC cards with memory and clock functions have been rapidly developed. It contains designed IC chips, LSI chips, elements with display functions, etc., and a power supply battery with a thickness of less than 1 mm that supplies power to these functional elements.

By the way, it is inconvenient to use solar cells, which are often used in card-type calculators that do not have a memory function, as the source battery for thin electronic devices such as those mentioned in Section 2. This is because, without it, the power generation function of the solar cell will stop, and the power supply to each functional element will be disrupted, causing the entire a″JAJA problem.

Therefore, in thin electronic devices equipped with a memory function or a clock function, a power source battery that does not constantly supply power to functional elements is required. In order to meet such requirements, a flat battery has been proposed, the cross-sectional view of which is illustrated in FIG. The active material 2 is a negative electrode active material, and a separator 3 is interposed between the two to form a power generation element. This power generation element includes a positive terminal plate 4 which serves as an exterior and a current collector. A negative terminal plate 5 is disposed, and a rod-shaped electrically insulating sealing body 6 is hermetically sealed to the mutually opposing peripheral edges of each terminal plate 4.5.

By the way, part 4 shows a partially cutaway cross-sectional view of the structure of a thin electronic device in which a flat battery as described above is incorporated.
In FIG. 9, which will be explained based on the drawings, 11 and 12 are a pair of topsheets that serve as the exterior of the device, 11 is an upper topsheet, and 12 is a bottom topsheet. These sheets are, for example, resin sheets with electrical insulation properties, such as vinyl chloride sheets. Reference numeral 13 denotes an electrically insulating frame-shaped sealing body interposed between the above-mentioned pair of topsheets, the upper and lower surfaces of which are sealed to the mutually opposing peripheral edges of the topsheets 11 and 12. A sealed space is formed between the pair of topsheets. Various functional elements are placed within this space.

A power supply battery is arranged based on predetermined design criteria.

That is, 14 is a circuit sheet, for example, an LSI
Chip components such as chips and chip capacitors are mounted, and multiple sets of split fixed contacts are also arranged. Reference numeral 15 denotes the above-mentioned flat battery, which is placed beside the circuit sheet 14, and its positive and negative terminal plates 4.5 are connected to the front and rear surfaces of the circuit sheet through lead terminals 16 and 17 having spring properties, respectively.
It is connected to a wiring network (not shown) on the back side and supplies the necessary power to each functional element.

However, when a thin electronic device with such a structure is used as an IC card or a card-type calculator, if stress is applied from the outside when carrying or using the device, it can easily bend or twist, causing the card to lose its function. There is a great risk of this happening. Moreover, the connection between the completed flat battery and the circuit sheet is made elastically by lead terminals placed on the top and bottom surfaces of the battery, and the thickness of the entire thin electronic device is 150 mm (international standard). Since the thickness of the battery itself cannot be increased because it is regulated by Japan Mechanism (Japan Organization) standards, it is difficult to increase the discharge capacity of the battery, which makes it unsatisfactory in terms of long-term use of thin electronic devices. isn't it.

Therefore, a thin electronic device as illustrated in FIG. 5 has been proposed (see Japanese Patent Application No. 61-104722). This is a structure in which the fully bent base sheet 18 also functions as a negative terminal plate of the flat battery 15'.

In the case of this device, bending of the device is effectively prevented by the function of the metal base sheet 1g, and at least one of the lead terminal 17 or the negative terminal plate 5 shown in FIG. By increasing the thickness of the battery, its discharge capacity can be increased and it can be used for a long period of time.

(Problems to be Solved by the Invention) However, in the thin electronic device illustrated in FIG. 5, it is planned to incorporate more functional elements than before, such as magnetic field generating coils, to make it even more multifunctional. In this case, even though the power used increases, the volume occupied by the power supply battery in the equipment must become smaller, and as a result,
The problem that the usage period of the equipment becomes extremely short becomes inevitable.

For this reason, it is possible to replace the power supply battery to extend the usage life of the device, but as a practical matter, these thin electronic devices are manufactured by bonding various parts to each other, so it is difficult to replace the battery. treatment is extremely difficult.

The present invention aims to solve the above-mentioned problems and provide a thin electronic device with a new structure that can prevent bending and twisting during transportation and use, increase discharge capacity, and enable multifunctionality. .

[Structure of the Invention] (Means and Effects for Solving the Problems) The thin electronic device of the present invention is divided into two upper and lower chambers by a metal base sheet, and one of the lower chambers is provided with the metal base sheet. It is characterized by a structure in which a power supply battery is housed in the form of a terminal board.

Below, the thin electronic device of the present invention will be explained based on FIGS. 1 and 2. FIG. 1 is an exploded perspective view, and FIG. 2 is a longitudinal sectional view.

In the figure, 21 is an upper surface sheet, and 22 is a lower surface sheet, both of which constitute a pair of surface sheets that also serve as the exterior. A metal substrate sheet 23 is adhered to one surface of one of the top sheets over the entire surface (in FIG. 2, it is stuck to the upper surface of the lower surface sheet 22).

Both 24a and 24b are electrically insulating frame-shaped sealing bodies, 24a is an upper frame-shaped sealing body, 24b is a lower frame-shaped sealing body, and 25 is a metal base sheet.

Upper and lower surface sheets 21, 22. Frame-shaped sealing body 24a, 2
4b, metal substrate sheet 23 and metal base sheet 25
Both are constructed to have substantially the same planar shape.

The above-mentioned members are stacked one after another and their peripheral edges are sealed. The structure thus obtained has a top surface sheet 21. Upper frame-shaped sealing body 24a and metal base sheet 25
and an upper chamber space A formed by the metal base sheet 25. The entire internal space is divided into two chambers, a lower chamber space B formed by the lower frame-shaped sealing body 24b and the metal substrate sheet 23.

In this upper chamber space A, a circuit sheet 26 is installed on a metal base sheet 25 which is the boundary of the whole, and further on the circuit sheet 26, for example, an LSI chip 27. Chip parts such as capacitor chips 28° display element 29. Keyboard circuit 30. Various functional elements such as external connection terminals 31 are mounted.

Further, in the lower chamber space B, a metal substrate sheet 23 is used as one terminal plate (negative electrode terminal plate in the figure), and a negative electrode active material 32. A power generation element formed by laminating a separator 33 and a positive electrode active material 34 is housed.

In this case, the metal base sheet 25 serves as a positive terminal plate.

In the figure, 35 is a window for exposing the external connection terminal 31, and 36 and 37 are the display elements 31. This is a window for seeing through the keyboard circuit 30.

Although the above explanation has been made regarding the case where a frame-shaped sealing body is used, the device of the present invention does not use a frame-shaped sealing body, but, for example, by folding the peripheral edge of the upper surface sheet or the lower surface sheet inward by an appropriate width, A structure may be employed in which a metal base sheet is sandwiched and sealed between the bent portions.

Furthermore, in the above explanation, a case has been shown in which the metal substrate sheet is used as the negative terminal plate and the metal substrate sheet is used as the positive terminal plate, but in the device of the present invention, the metal substrate sheet is used as the positive terminal plate. There is no problem even if the fully bent base sheet is used as a negative terminal plate in a cylindrical structure.

(Embodiments of the invention) (1) Production of thin electronic equipment A vinyl chloride sheet 22 with a thickness of 0.075 s+m on one side
A negative electrode active material is pasted on a stainless steel substrate sheet 23 having the same planar dimensions as the card shape defined in the ISO standard for intestines, with a length of 85.6 mm and a width of 54.0 mm and a thickness of 0.02 a. The lithium plate 32 was integrated by pressure bonding, and a pellet 34 of manganese dioxide, which is a positive electrode active material, was further attached thereon via a separator 33 to constitute a power generation element.

Next, a lower frame-shaped sealing body 24b made of a heat-fusible resin (for example, ionomer resin) having the same external dimensions as the substrate sheet 23 is placed, and a lower frame-shaped sealing body 24b having the same planar dimensions as the substrate sheet 23 and a thickness of 0 is then placed. .02m metal base sheet 2
5 was allowed to stand for a while, and then the peripheral edge of the whole was heated to 180° C. and sealed to form a flat battery. The area of the power generation element in this battery is 3326-2.

The thickness is 0.21cm, and the total height of the battery is 0.25cm.
After that, the lower frame-shaped sealing body 2 was placed on the metal base sheet 25.
An upper frame-shaped sealing body 24a made of vinyl chloride with the same dimensions as 4b and a thickness of 0.075 m is placed, various functional elements are further mounted and arranged based on predetermined design standards, and finally a vinyl chloride upper frame is placed. After placing the surface sheet (21), the peripheral portion was adhered with an adhesive.

The obtained electronic device had a thickness of 0.401 mm in the royal space and a total thickness of 0.8 mm.

For comparison, an electronic device illustrated in FIG. 1 was manufactured.

In this device, the thickness of the upper and lower surface sheets are each 0.075a+m, and the area of the power generation element is 300am.
``The thickness was 0.51 mm, and the total height of the battery was 0.55 mm.The thickness of the lead terminal storage space was 0.10 fl.
1 m+, and the thickness of the entire device was 0.8 .mu.m layer, which was the same as in the example.

(2) Performance evaluation For each of the above two types of thin electronic devices lθ, a bending test specified in the ISO standard for the mechanical durability test of IC cards was conducted to determine the number of malfunctions. In addition, the bending test was performed in the long side direction of the device: amplitude 2C■, 30
The test was performed 250 times each on the front and back sides of the device, 4 times for a total of 1000 times, with an amplitude of 1 cm in the short side direction and 30 times/minute. The results are shown in Table 1.

Table 1 As is clear from Table 1, the thin electronic device of the present invention is strong against mechanical shocks such as bending of the device, and does not exhibit any abnormality in operation.

In addition, for the flat batteries incorporated in Examples and Comparative Examples, 6
8, a constant Ω load discharge was performed and the discharge capacity was measured. The results are shown in Table 2.

As is clear from Table 2, the battery according to the present invention has a discharge capacity about 2.7 times that of the conventional battery. This is an effect based on the fact that the area of the power generation element is increased even though the total battery height has been reduced from 0.55 mm (conventional) to 0.25 mm.

[Effects of the Invention] As is clear from the above description, the thin electronic device of the present invention has excellent durability against mechanical shocks such as bending and twisting during transportation and use, and prevents malfunctions and malfunctions of the device. Damage etc. can be prevented. In addition, the thickness of the power generation element in a flat battery that is assembled into a single battery is thinner than in the conventional case, but since its area can be increased, the discharge capacity of the battery is ultimately high, 2 to 3 times that of the conventional case. In addition, since the electrode area is large, it is possible to conduct a large current, and the device can be provided with multiple functions.

It goes without saying that this thin electronic device can be used as a card-type electronic device with the same dimensions as a credit card, which is generally referred to as an IC card.
It can also be used as a card. It can also be used as a thin computer or electronic device with a clock function, l507818. 7810゜7811. 7812. Based on the content being considered as a provisional standard such as 7813, it can also be used as an embossed credit card or a magnetic credit card with a magnetic stripe.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an uninvented thin electronic device. FIG. 2 is a longitudinal sectional view. FIG. 3 is a longitudinal sectional view of a conventional flat battery, and FIG. 4 is a partially cutaway longitudinal sectional view of a thin electronic device incorporating the battery of FIG. 3. Figure 5 is a patent application filed in 1973.
1-104722 Akito 1 is a partially cutaway vertical cross-sectional view of the thin electronic device. 1.34 - Positive electrode active material 2.32 - Negative electrode active material 3.33 - Separator 4 - Positive electrode terminal plate 5 - Negative electrode terminal plate 6, 13 - Frame-shaped sealing body 11.21 - Upper surface sheet 12. 22 - Lower surface Sheet 14.26 - Circuit sheet 16.17 - Lead terminal 18.23 - Metal substrate sheet 24a - Upper frame-shaped sealing body 24b - Lower frame-shaped sealing body 25 - Metal substrate sheet A - Upper chamber space B - Lower chamber space No. Figure 2 Figure 3

Claims (2)

[Claims] (1) The metal base sheet is divided into upper and lower chambers, the upper chamber houses functional elements, and the lower chamber houses a power source battery using the metal base sheet as one terminal board. Thin electronic devices. (2) The thin electronic device according to claim 1, wherein the power supply battery is a flat battery.