JPH0817179A - Battery incorporated in electronic equipment - Google Patents

Abstract

PURPOSE:To eliminate a battery holder, a battery contact piece etc. and to reduce the number of parts and man-hours by using a film battery as a battery incorporated in an electronic equipment and bringing the film battery in close contact to a printed circuit board in one piece. CONSTITUTION:A film battery 30 is a high-performance battery with a high energy density, a macromolecular solid electrolyte 33 is laid out between a positive electrode (manganese dioxide) 31 and a negative electrode (lithium, etc.) 32, the surrounding of pyroelectrics (also used as armored body) 34 and 35 of the positive and negative electrodes consisting of a metal plate (foil) is sealed by a sealing material 36. Then, with double-sided patterns 100 and 101 in a substrate 12, a conductor 42 is plate to a through hole 41 for continuity. Similarly, the area between the substrate 12 and the electrode of the film battery 30 continues via a through hole, thus efficiently incorporating a battery into a narrow space in an electronic equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery incorporated as a memory backup power source in electronic equipment.

[0002]

2. Description of the Related Art Generally, an electronic device is equipped with a primary battery, a secondary battery, a high-capacity capacitor, etc. for memory backup. For example, a video deck has a battery and a capacitor built therein for storing the date, time, broadcasting station channel, and changeover switch.

Previously, these were for a relatively short time in order to prepare for a short power outage or power off at a store in the evening or on regular holidays. Nowadays, however, the time is set at the time of factory shipment. However, it is desired that the user can back up for a considerably long time (at least about three months) so that the preset is not necessary when the user purchases it.

An example of conventional electronic equipment of this type is shown in the video camera (VTR integrated type) of FIG. The video camera 1 includes a video camera body 2, an imaging lens 3, a viewfinder 4, and a battery 5. In addition to the VTR block 6 having a video tape drive mechanism in the video camera body 2, a counter, date and time, various modes (for example, auto, manual focus, white balance, etc.)
There is a liquid crystal panel 7 for displaying, and a switch button switch 8 for setting the date and time, and for switching the display and mode, and a battery for mounting a button battery 10 for memory backup. A holder 11 is detachably provided.

FIG. 2 shows a state in which the outer casing of the video camera 1 shown in FIG. 1 is removed. Here, 12 is a printed circuit board on which the liquid crystal panel 7 and the changeover button switch 8 are mounted (hereinafter simply referred to as a board). ), On this substrate 12, in addition to the liquid crystal panel 7 and the changeover button switch 8 as shown in an enlarged view in FIG. 3, battery contact pieces 13a and 13b which are contacts of the battery 10 are mounted, that is, When the button battery 10 is set in the battery holder 11 and is inserted into the video camera body, the + and-electrodes of the button battery 10 come into contact with the battery contact pieces 13a and 13b, respectively, so that a voltage is applied. Has become. Reference numeral 14 denotes a flexible printed board that connects the electronic circuit of the board 12 and the electronic circuit of another board.

FIG. 4 is a view of the substrate 12 viewed from the back side.
In this figure, 15 is a connector for receiving the flexible printed circuit board 14, 16 is a shield case made of a metal plate, and this shield case 16 is fixed to the board 12 by soldering or the like at legs 17 protruding at a plurality of positions, and The shield case 16 is connected to the circuit pattern (ground) of the board 12, and thereby the shield case 16 emits unnecessary radiation (radio waves) from the electronic circuit on the board 12 below the shield case 16.
It works to shield.

A through hole 18 is formed in a part of the shield case 16, and an adjusting tool such as a screwdriver (driver) is inserted into the through hole 18 and mounted on the substrate 12 thereunder. A variable electronic component 19 such as a variable resistor can be rotated to adjust constants and the like.

Reference numeral 20 is an IC mounted under the shield case 16, and this IC 20 is backed up by the button battery 10. An example of this IC backup circuit is shown in FIG. 6, and as is clear from this circuit diagram, the IC 20 is backed up by the battery 10 to protect the memory even when the main power supply is off. In this circuit, the resistor 21 is for controlling the charging current flowing into the battery 10 when the backflow prevention diode 22 is broken.

Further, the power source for memory backup of the IC 20 is not limited to the one in which the button battery 10 is set in the battery holder 11 and inserted in the video camera body as described above, and it is built in the video camera body from the beginning. It is also possible to have a structure that is stored. That is, as shown in FIG. 4, a button battery 23 having an electrode piece 23a welded thereto is used as the substrate 1
2 may be directly mounted, or a high capacity capacitor 24 may be mounted on the substrate 12 as shown in FIG. In the case of this capacitor 24, it is normally charged and discharged when no voltage is applied from the other to back up the IC.

[0010]

In the conventional structure as described above, the button battery 10 is set in the battery holder 11 and inserted into the video camera main body, and the number of parts is as large as the battery holder 11 is used. In many cases, the structure is complicated, and more man-hours are required to mount the contact pieces 13a and 13b as the battery contacts on the substrate 12, and the button battery 23 and the capacitor 24 are directly mounted on the substrate 12. When trying to obtain a sufficient capacity for memory backup, the button battery 23 and the capacitor 2
4 needed a big one, which was a problem due to space in the video camera. The present invention has been made in view of the above points.

[0011]

That is, according to the present invention, a film battery is used as a memory backup battery incorporated in an electronic device, and the film battery is adhered to a printed circuit board in the electronic device to form a layer structure. is there.

[0012]

According to the present invention configured as described above, a battery can be efficiently assembled in a narrow space in an electronic device without increasing the thickness of a printed circuit board, and a battery holder and a battery holder which have been conventionally required are provided. Since the battery contact piece and the like can be eliminated, the number of parts and man-hours can be reduced accordingly.

[0013]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 7 shows a small video camera as an example of electronic equipment. The video camera 1 comprises a video camera body 2, an image pickup lens 3, and a viewfinder 4.
The video camera main body 2 has a liquid crystal panel 7 for displaying a counter, date, time, and various modes, and a switch button switch 8 for setting the date and time, switching the display, and switching modes. .

FIG. 8 shows a state in which the outer casing of the compact video camera 1 of FIG. 7 is removed, and 12 is a substrate on which the liquid crystal panel 7 and the changeover button switch 8 are mounted. FIG. 9 shows the board 12 in an enlarged manner, 14 is a flexible printed board for connecting an electronic circuit of the board 12 and an electronic circuit of another board, and 15 is mounted on the board 12 and is mounted on the flexible printed board 14. The receiving connector, 20 is an IC.

In the present invention, the film battery 30 is used as a power source for the memory backup of the IC 20, and the film battery 30 is brought into close contact with the substrate 12 to be integrated.

10 to 13 show the first embodiment, FIG. 10 is a perspective view of a substrate on which film batteries are stacked, FIG. 11 is a sectional view of the same substrate, and FIGS. 12 and 13 are manufacturing steps of the same substrate. FIG.

The substrate 12 is a so-called double-sided substrate having a circuit pattern printed on both sides, and the film battery 30 is laminated on the substrate 12 with a glass epoxy plate 40 interposed therebetween. This film battery 30 is a newly developed thin battery with high energy density and high performance, and its basic configuration is a positive electrode (manganese dioxide etc.) 31 and a negative electrode (lithium etc.) 32.
The solid polymer electrolyte 33 is placed between the metal plate and the metal plate (foil).
The structure is such that the periphery of the positive electrode and negative electrode current collectors (also outer casings) 34 and 35 are sealed with a sealing material 36. The film battery 30 is extremely thin with a thickness t of about 0.2 mm, but the thickness is exaggerated in the figure to clearly show the structure.

The patterns 100 and 101 on both sides of the substrate 12 are electrically connected by plating a through hole 41 with a conductor 42. Similarly, the substrate 12 and the electrodes of the film battery 30 are also electrically connected via the through holes.

That is, the substrate 12, the glass epoxy plate 40 and the film battery 30 are communicated with each other and the through holes 43 and 44 are provided.
Conductors 45 and 46 are plated in the through holes 43 and 44, respectively, and the conductor 45 electrically connects the positive electrode collector 34 of the film battery 30 and the pattern 102 of the substrate 12 to each other to form the pattern 102. Is applied to the negative electrode current collector 35 of the film battery 30 and the pattern 103 of the substrate 12 by the other conductor 46.
Are conducted, and the pattern 103 is at 0V.
In the film battery 30, the through holes 43, 44
A sealing material 37 is arranged to insulate the portion where the is formed.

Next, the manufacturing process of the battery laminated substrate as described above will be described with reference to FIGS. First, as shown in FIG. 12, a film battery 30, a glass epoxy plate 40, a substrate 1
2 are individually prepared, and these 3 pieces are stacked and pressure-bonded to form a laminated state. It should be noted that the substrate 12 is preliminarily printed with a pattern on both sides thereof, a through hole 41 is provided therethrough, and a conductor 42 is plated therethrough to electrically connect the patterns 100 and 101 on both sides.

Then, as shown in FIG. 13, the through holes 43 and 44 are drilled in the state where the film battery 30, the glass epoxy plate 40 and the substrate 12 are laminated as described above, and the through holes 43 and 44 are formed. Conductor plating is applied to the inner peripheral surface of the. If plating is difficult, a silver paste or a copper paste may be inserted, or a cylindrical or round bar-shaped conductor may be caulked.

Through hole 4 in film battery 30
3 is formed, that is, the portion through which the conductor 45 passes has only the positive electrode current collector 34 without the negative electrode current collector 35. Therefore, the positive electrode current collector 34 is connected to the substrate 12 via the conductor 45. In the portion which is electrically connected to the pattern 102 and in which the through hole 44 is formed, that is, the portion where the conductor 46 passes, the positive electrode current collector 34 is not provided and only the negative electrode current collector 35 is provided. The negative electrode current collector 35 is electrically connected to the pattern 103 of the substrate 12 via.

The film battery 30 laminated on the substrate 12 as described above has an extremely thin thickness t of about 0.2 mm as described above, and therefore, the thickness of the substrate 12 is hardly increased and the film battery 30 is installed in the main body of the video camera. It can be easily installed in a narrow space. The technique of stacking the film battery 30 on the substrate 12 may be applied to the technique of the current multi-layer printed circuit board, and is therefore natural.

Further, by integrally incorporating the film battery 30 into the substrate 12 as a power source for memory backup, the structure on the substrate becomes simpler than the conventional one. That is, as is apparent from FIG. 9, it is not necessary to provide the battery contacts 13a and 13b for the button battery 10 on the substrate 12 as shown in FIG.
The battery holder 11 for use is also unnecessary. Of course, the button battery 23 and the capacitor 24 shown in FIGS. 4 and 5 of the conventional example are also unnecessary. Therefore, the substrate 12 can be formed smaller than the conventional one, and is particularly effective when applied to a small video camera as shown in FIG.

As the film battery 30, either a primary battery or a secondary battery may be used, but the secondary battery is most suitable because of the structure which is integrated into the substrate 12.

14 to 16 show a second embodiment, in which the substrate is further developed into multiple layers. FIG. 14 is a perspective view of a substrate on which film batteries are laminated, and FIGS. 15 and 16 are explanatory views of a manufacturing process of the substrate.

In this embodiment, in addition to the substrate 12, another substrate 52 similar to the substrate 12 is provided.
Glass epoxy plates 40, 50 between the two substrates 12 and 52
The film batteries 30 are stacked so that the film batteries 30 are sandwiched therebetween. The patterns 104 and 105 on the substrate 12 and the patterns 106 and 107 on the substrate 52 are through holes 53 and 54, respectively.
The conductors 55 and 56 inserted in the conductor are electrically connected.

The positive electrode collector 34 of the film battery 30 and the patterns 108 and 109 of the substrate 12 and the patterns 110 and 111 of the substrate 52 are electrically connected by the conductors 59 and 60 inserted into the through holes 57 and 58, respectively. Therefore, a positive voltage is applied to the patterns 108, 109 and 110, 111. In addition, the negative electrode current collector 35 of the film battery 30, the patterns 112 and 113 of the substrate 12, and the substrate 5
The second patterns 114 and 115 are through holes 6 respectively.
The conductors 63 and 64 inserted in the conductors 1 and 62 are electrically connected to each other, whereby the patterns 112, 113 and 114,
115 is 0V.

The manufacturing process of this multi-layer substrate will be described.
First, as shown in FIG. 15, the substrates 12 and 52, the glass epoxy plates 40 and 50, and the film battery 30 are prepared, and these five sheets are stacked and pressure-bonded to form a laminated state. In this laminated state, as shown in FIG. 16, five sheets are communicated with each other to form through holes 53, 54, 57, 58, 61, 62 by a drill, and the through holes 53, 54, 57, 58, 61,
A conductor such as a silver paste is inserted in each of 62.

Through hole 5 in film battery 30
The portions where the conductors 3, 54 are formed, that is, the portions through which the conductors 55, 56 pass are the portions which have neither the positive electrode current collector 34 nor the negative electrode current collector 35.
04 and 105 and the patterns 106 and 107 of the substrate 52 are electrically connected through the conductors 55 and 56 regardless of the film battery 30.

In the film battery 30, the portions where the through holes 57 and 58 are formed, that is, the conductors 59 and 60.
The portion through which the positive electrode current collector 34 passes without the negative electrode current collector 35.
Therefore, the positive electrode current collector 34 is electrically connected to the patterns 108 and 109 of the substrate 12 and the patterns 110 and 111 of the substrate 52 through the conductors 59 and 60. Further, in the film battery 30, the portions where the through holes 61 and 62 are formed, that is, the portions where the conductors 63 and 64 pass, have only the negative electrode current collector 35 without the positive electrode current collector 34. , 64 through the negative electrode current collector 35 to the substrate 12
Patterns 112 and 113 and the pattern 11 on the substrate 52
It is electrically connected to 4,115.

FIGS. 17 to 19 show the third embodiment, in which the film battery is attached to the space when the substrate has a sufficient area. FIG. 17 is a perspective view of a substrate to which a film battery is attached, FIG. 18 is a perspective view of the film battery, and FIG. 19 is a perspective view of the film battery in an upside-down state.

The film battery 30 in this embodiment has an adhesive surface 65 on the back side as is apparent from FIG. 19, and when the film battery 30 is attached to the substrate 12, a protective paper 66 covering this adhesive surface 65 is provided. Peel off the adhesive surface 65
Is brought into close contact with the substrate 12. Along with this, the electrode terminals 34a, 35 protruding from the exterior body of the film battery 30.
a is fixed and connected to the patterns 116 and 117 of the substrate 12 by soldering or the like. In this embodiment, the film battery 30 can be integrated with the substrate 12 relatively easily as described above.

20 to 23 show a fourth embodiment, which is a case where a film battery is attached to a flexible printed board. 20 is a perspective view of a flexible printed circuit board to which a film battery is attached, and FIG. 21 is an exploded perspective view of the same.
22 is a perspective view of a part of the film battery, and FIG. 23 is the same.
It is sectional drawing.

Although not shown in the drawing, the film battery 30 has an adhesive surface on the back surface side, and is attached to a part of the flexible printed board 14 at this adhesive surface. Since the film battery 30 itself has flexibility, it can be flexibly bent integrally with the flexible printed board 14.

The film battery 30 is formed with through holes 67 and 68 communicating with the flexible printed circuit board 14. By pinching the pin-shaped conductors 69 and 70 through the through holes 67 and 68, the film battery 30 is crimped. Positive current collector 34 and flexible printed circuit board 1
4 and the pattern 11 of the flexible printed board 14 and the negative electrode current collector 35 of the film battery 30.
9 are conducted respectively.

Through hole 6 in film battery 30
The portion where 7 is formed, that is, the portion through which the conductor 69 passes has only the positive electrode current collector 34 without the negative electrode current collector 35. Therefore, the positive electrode current collector 34 is flexible printed through the conductor 69. In the portion that is electrically connected to the pattern 118 of the substrate 14 and in which the through hole 68 is formed, that is, the portion where the conductor 70 passes, the positive electrode current collector 34 is not provided and only the negative electrode current collector 35 is provided. Negative electrode current collector 35 through body 70
Are electrically connected to the pattern 119 of the flexible printed board 14.

In this embodiment as described above, the film battery 30 is also bent together with the flexible printed circuit board 14, so that the film battery 30 can be arranged at a portion having a curvature. Incidentally, in the present embodiment, the conductive means between the flexible printed circuit board 14 and the film battery 30 is not limited to the method of crimping the pin-shaped conductor as described above, but may be soldering.

Although several examples of the present invention have been described above,
It goes without saying that the present invention is not limited to the configurations of these examples and can take various other embodiments.

[0041]

As described above, according to the present invention, a film battery is used as a battery incorporated in an electronic device, and the film battery is brought into close contact with and integrated with a printed circuit board so that a narrow space can be provided in the electronic device. Since the battery can be efficiently assembled and the battery holder, the battery contact, etc., which have been conventionally required, can be eliminated, the number of parts and man-hours can be reduced correspondingly, which is advantageous in cost.

[Brief description of drawings]

FIG. 1 is a perspective view of a video camera.

FIG. 2 is a state in which the outer casing of the video camera is removed.

FIG. 3 is an explanatory view of a conventional example, and is a perspective view of a printed circuit board incorporated in a video camera.

FIG. 4 is a perspective view of the same as seen from the back side of the printed circuit board.

FIG. 5 is an explanatory diagram of another conventional example.

FIG. 6 is an explanatory diagram of a memory backup circuit.

FIG. 7 is a perspective view of a video camera.

FIG. 8 is a state in which the outer casing of the video camera is removed.

FIG. 9 is an explanatory view of the present invention and is a perspective view of a printed circuit board incorporated in a video camera.

FIG. 10 is a view showing a first embodiment and is a perspective view of a printed circuit board on which film batteries are laminated.

FIG. 11 is a sectional view of the same printed circuit board.

FIG. 12 is an explanatory diagram of a manufacturing process of the same printed circuit board.

FIG. 13 is an explanatory diagram of a manufacturing process of the same printed circuit board.

FIG. 14 is a diagram showing a second embodiment and is a perspective view of a multilayer printed circuit board in which film batteries are laminated.

FIG. 15 is an explanatory diagram of a manufacturing process of the same printed circuit board.

FIG. 16 is an explanatory diagram of a manufacturing process of the same printed circuit board.

FIG. 17 is a diagram showing a third embodiment and is a perspective view of a printed circuit board to which a film battery is attached.

FIG. 18 is a perspective view of the film battery of the same.

FIG. 19 is a perspective view showing a state in which the film battery is turned upside down.

FIG. 20 is a view showing a fourth embodiment and is a perspective view of a flexible printed circuit board to which a film battery is attached.

FIG. 21 is an exploded perspective view of the same flexible printed circuit board.

FIG. 22 is a perspective view of an essential part of the film battery.

FIG. 23 is a sectional view of the main part of the film battery of the same.

[Explanation of symbols]

1 Video Camera (Electronic Device) 12,52 Printed Circuit Board 14 Flexible Printed Circuit Board 30 Film Battery 31 Positive Electrode 32 Negative Electrode 33 Polymer Solid Electrolyte 34 Positive Electrode Current Collector 35 Negative Current Collector 36 Sealing Material 43, 44, 57, 58, 61 , 62, 67, 68 Through hole 45, 46, 59, 60, 63, 64, 69, 70 Conductor

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masaru Amano 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Katsuji Ashida 6-6 Josaimachi, Takatsuki-shi, Osaka Inside Yuasa Corporation (72) Inventor Hiroshi Kagawa 6-6 Josaimachi, Takatsuki City, Osaka Prefecture Inside Yuasa Corporation

Claims (5)

[Claims] 1. A battery built in an electronic device, wherein a film battery is used as the battery, and the film battery is adhered to a printed circuit board in the electronic device to form a layer. Built-in battery. 2. A battery incorporated in an electronic device according to claim 1, wherein the electrodes of the printed circuit board and the film battery are energized by passing through a through hole and inserting a conductor therein. 3. A battery built in an electronic device according to claim 1, wherein the film battery is attached to a printed circuit board, and its electrodes are connected to a circuit pattern of the printed circuit board by soldering or the like to be energized. 4. The battery according to claim 1, wherein the film battery is mounted on a flexible printed circuit board and is built in an electronic device. 5. The printed circuit board according to claim 2, wherein at least a part of the positive electrode only and a part of the negative electrode only are provided in a part of the film battery, and a conductor is inserted into this part through a through hole. A battery built into an electronic device that is energized.