JP3279817B2 - Battery built into electronic equipment - Google Patents

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 supply in electronic equipment.

[0002]

2. Description of the Related Art In general, a primary battery, a secondary battery, a high-capacity capacitor and the like are incorporated in an electronic device for memory backup. For example, a video deck has batteries and capacitors built therein for the date, time, broadcasting station channel, and memory of a changeover switch.

In the past, these were used for a relatively short time in order to prepare for a short-time power outage or power off at night or at regular holidays at a store, but now, the time is set at the time of factory shipment. What is desired is a backup that can be backed up for a considerably long time (at least three months) so that the user does not need to purchase a preset.

An example of this type of conventional electronic equipment is shown as a video camera (VTR integrated type) in FIG. The video camera 1 includes a video camera main body 2, an imaging lens 3, a viewfinder 4, and a battery 5. The video camera body 2 includes a VTR block 6 having a video tape driving mechanism, a counter, date and time, and various modes (for example, auto, manual focus, white balance, and the like).
And a switch button switch 8 for setting the date and time, switching the display and switching the mode, and a battery for mounting a button battery 10 for memory backup. The holder 11 is provided detachably.

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

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 board 14, 16 is a shield case made of a metal plate, and the shield case 16 is fixed to the board 12 by soldering or the like at legs 17 protruding at a plurality of places, and The shield case 16 is connected to a circuit pattern (earth) of the substrate 12, thereby causing unnecessary radiation (radio waves) emitted from an electronic circuit on the substrate 12 below the shield case 16.
It has a function of shielding.

A through hole 18 is formed in a part of the shield case 16, and an adjusting tool such as a screwdriver is inserted into the through hole 18 and mounted on the substrate 12 thereunder. A constant or the like can be adjusted by rotating a variable electronic component 19 such as a variable resistor.

Reference numeral 20 denotes an IC mounted under the shield case 16, and the IC 20 is backed up by the button battery 10. An example of a backup circuit of this IC is shown in FIG. 6. As is apparent from this circuit diagram, the IC 20 is backed up by the battery 10 even when the main power is off, and the memory is protected. In this circuit, the resistor 21 controls the charging current flowing into the battery 10 when the conduction of the backflow prevention diode 22 is broken.

The power source for backing up the memory 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 into the video camera main body as described above. It is good also as a structure to leave. That is, as shown in FIG.
2 may be mounted directly, 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 other sources to back up the IC.

[0010]

In the conventional configuration as described above, the button battery 10 is set in the battery holder 11 and inserted into the video camera body. A large number of structures are also complicated, and a lot of man-hours are required to mount the contact pieces 13a and 13b as battery contacts on the substrate 12, and those in which the button battery 23 and the capacitor 24 are directly mounted on the substrate 12 are as follows. To obtain sufficient capacity for memory backup, button battery 23 and capacitor 2
4 required a large one, which was problematic due to space limitations 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 built in an electronic device, and the film battery is formed in a layered form by closely adhering to a printed circuit board in the electronic device. The printed circuit board and the electrode of the film battery are energized by inserting a conductor therethrough through a through-hole, and further, in this configuration, at least a portion of only the positive electrode and only a portion of the negative electrode are provided in a part of the film battery. Each of them is provided with a through-hole passing through this portion and a conductor being inserted into the through-hole so as to supply current to the printed circuit board.

[0012]

According to the present invention constructed as described above, a battery can be efficiently incorporated into 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, can be provided. Since the battery contact pieces 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-sized video camera as an example of electronic equipment. This video camera 1 comprises a video camera body 2, an imaging lens 3, and a viewfinder 4.
The video camera 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 the mode. .

FIG. 8 shows a state in which the outer casing (cabinet) of the small-sized video camera 1 shown in FIG. 7 has been removed. Here, 12 is a substrate on which the liquid crystal panel 7 and the changeover switch 8 are mounted. FIG. 9 shows the substrate 12 in an enlarged manner. Reference numeral 14 denotes a flexible printed circuit board for connecting an electronic circuit of the substrate 12 to an electronic circuit of another substrate. Reference numeral 15 denotes a flexible printed circuit board mounted on the substrate 12. The receiving connector, 20 is an IC.

In the present invention, a film battery 30 is used as a memory backup power source for the IC 20, and the film battery 30 is adhered to the substrate 12 to be integrated.

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

The substrate 12 is a so-called double-sided substrate on which circuit patterns are printed on both sides. A film battery 30 is laminated on the substrate 12 via a glass epoxy plate 40. The film battery 30 is a newly developed thin, high-energy density, high-performance battery having a basic configuration including a positive electrode (such as manganese dioxide) 31 and a negative electrode (such as lithium) 32.
A solid polymer electrolyte 33 is placed between the
The structure is such that the periphery of the current collectors (also serving as an exterior) 34 and 35 of the positive electrode and the negative electrode is sealed with a sealing material 36. Although the thickness t of the film battery 30 is extremely thin, about 0.2 mm, the thickness is exaggerated in the drawing to clearly show the structure.

In the substrate 12, the conductors 42 are plated on the through holes 41 and are electrically connected to the patterns 100 and 101 on both surfaces. Similarly, electrical continuity is established between the substrate 12 and the electrodes of the film battery 30 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, 44
The through holes 43 and 44 are plated with conductors 45 and 46, respectively. The conductor 45 electrically connects the positive electrode current collector 34 of the film battery 30 and the pattern 102 of the substrate 12 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
The portion where is formed is insulated by disposing a sealing material 37.

Next, the manufacturing process of the above-described battery laminated substrate will be described with reference to FIGS. First, as shown in FIG. 12, the film battery 30, the glass epoxy plate 40, the substrate 1
2 are separately prepared, and these three sheets are stacked and pressed to form a stacked state. The pattern is printed on both sides of the substrate 12 in advance, the through holes 41 are formed in the through holes 41, the conductors 42 are plated thereon, and the patterns 100 and 101 on both sides are made conductive.

As shown in FIG. 13, through holes 43 and 44 are drilled in a state where the film battery 30, the glass epoxy plate 40, and the substrate 12 are stacked as described above. Is plated with a conductor. When plating is difficult, a silver paste or a copper paste may be inserted, or a tubular or round bar-shaped conductor may be crimped.

In the film battery 30, the through holes 4
3 is formed, that is, the portion through which the conductor 45 passes, has only the cathode current collector 34 without the anode current collector 35, and therefore, the cathode current collector 34 is In the portion where the through hole 44 is formed, that is, the portion through which the conductor 46 passes, there is no positive electrode current collector 34 but only the negative electrode current collector 35, The negative electrode current collector 35 is electrically connected to the pattern 103 of the substrate 12 via the.

As described above, the film battery 30 laminated on the substrate 12 has a very small thickness t of about 0.2 mm as described above. It can be easily assembled in a narrow space. The technology for laminating the film battery 30 on the substrate 12 is not a problem since the current multilayer printed circuit technology may be applied.

In addition, since the film battery 30 is integrally incorporated into the substrate 12 as a power source for memory backup, the configuration on the substrate is simplified as compared with the related art. That is, as is clear from FIG. 9, there is no need to provide the battery contacts 13a and 13b for the button battery 10 as shown in FIG.
Battery holder 11 is not required. The button battery 23 and the capacitor 24 shown in FIGS. 4 and 5 of the conventional example are of course unnecessary. For this reason, the substrate 12 can be formed smaller than before, and is particularly effective when applied to a small video camera as shown in FIG.

Although either a primary battery or a secondary battery may be used as the film battery 30, a secondary battery is optimal because of its structure integrated with the substrate 12.

FIGS. 14 to 16 show a second embodiment in which the substrate is further developed into a multilayer structure. FIG. 14 is a perspective view of a substrate on which a film battery is 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 and 50 between the two substrates 12 and 52
Are laminated so that the film battery 30 is interposed therebetween. The patterns 104 and 105 of the substrate 12 and the patterns 106 and 107 of the substrate 52 correspond to through holes 53 and 54, respectively.
Are electrically connected by the conductors 55 and 56 inserted into the first and second conductors.

The positive electrode current collector 34 of the film battery 30 is electrically connected to the patterns 108 and 109 of the substrate 12 and the patterns 110 and 111 of the substrate 52 by conductors 59 and 60 inserted in through holes 57 and 58, respectively. Accordingly, a positive voltage is applied to the patterns 108 and 109 and 110 and 111. Further, the negative electrode current collector 35 of the film battery 30 and the patterns 112 and 113 of the substrate 12 and the substrate 5
The second patterns 114 and 115 are the through holes 6 respectively.
1 and 62 are electrically connected by conductors 63 and 64 inserted into 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, substrates 12 and 52, glass epoxy plates 40 and 50, and a film battery 30 are prepared, and these five sheets are stacked and pressed to form a stacked state. In this stacked state, as shown in FIG. 16, five sheets are connected to each other, and through holes 53, 54, 57, 58, 61, and 62 are formed through a drill, and the through holes 53, 54, 57, 58, 61, and 61 are formed.
A conductor such as a silver paste is inserted into each of 62.

In the film battery 30, the through holes 5
3 and 54, that is, a portion through which the conductors 55 and 56 pass is a portion having neither the positive electrode current collector 34 nor the negative electrode current collector 35.
04 and 105 are electrically connected to the patterns 106 and 107 of the substrate 52 via the conductors 55 and 56 regardless of the film battery 30, respectively.

In the film battery 30, portions where the through holes 57 and 58 are formed, that is, conductors 59 and 60
The portion through which the positive electrode current collector 34 does not have 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 via the conductors 59 and 60. Further, the portion where the through holes 61 and 62 are formed in the film battery 30, that is, the portion where the conductors 63 and 64 pass, has only the negative electrode current collector 35 without the positive electrode current collector 34. , 64 via the negative electrode current collector 35 to the substrate 12
Patterns 112 and 113 and the pattern 11 of the substrate 52
4, 115 are conducted.

FIGS. 17 to 19 show a third embodiment in which a film battery is adhered to the space when the substrate has a sufficient area. 17 is a perspective view of the substrate to which the 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 inverted state.

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

FIGS. 20 to 23 show a fourth embodiment, in which a film battery is mounted on a flexible printed circuit board. FIG. 20 is a perspective view of a flexible printed circuit board to which a film battery is attached, FIG.
FIG. 22 is a perspective view of a part of the film battery, and FIG.
It is sectional drawing.

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

The film battery 30 is formed with through holes 67 and 68 communicating with the flexible printed circuit board 14. Pins of the conductors 69 and 70 are passed through the through holes 67 and 68, and the film battery 30 is caulked. Current collector 34 and flexible printed circuit board 1
4, the pattern 11 of the negative electrode current collector 35 of the film battery 30 and the pattern 11 of the flexible printed circuit board 14.
9 are conducted.

In the film battery 30, the through holes 6
The portion where the conductor 7 is formed, that is, the portion through which the conductor 69 passes, has only the cathode current collector 34 without the anode current collector 35, and therefore, the cathode current collector 34 is flexible printed via the conductor 69. In a portion where the pattern 118 of the substrate 14 is electrically connected and the through hole 68 is formed, that is, in a portion where the conductor 70 passes, the cathode current collector 34 is not provided and only the anode current collector 35 is provided. The negative electrode current collector 35 through the body 70
Is electrically connected to the pattern 119 of the flexible printed circuit board 14.

In this embodiment as described above, since the film battery 30 also bends integrally with the flexible printed circuit board 14, it can be arranged at a location having a curvature. In this embodiment, the means for conducting between the flexible printed circuit board 14 and the film battery 30 is not limited to the method of caulking the pin-shaped conductor as described above, but may be soldering.

Although several embodiments 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, but can adopt various other embodiments.

[0041]

As described above, according to the present invention, a film battery is used as a battery built in an electronic device, and the film battery is formed in a layered form by being closely attached to a printed circuit board in the electronic device. The electrodes of the battery are energized by inserting a conductor therethrough through a through-hole, and in this configuration, at least a portion of the film battery is provided with at least a positive electrode only, and a portion of only a negative electrode, respectively. By passing current through the printed circuit board by passing through-holes through the through-holes and inserting conductors into the through-holes, batteries can be efficiently incorporated into narrow spaces in electronic devices, and batteries that were conventionally required Since the holder, the battery contact, and the like can be eliminated, the number of parts and man-hours can be reduced correspondingly, which is advantageous in terms of cost.

[Brief description of the drawings]

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

FIG. 2 shows a state where an 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 built in a video camera.

FIG. 4 is a perspective view of the same as viewed 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 shows a state where an 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 built in the video camera.

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

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

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

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

FIG. 14 is a view showing a second embodiment, and is a perspective view of a multilayer printed circuit board on which film batteries are stacked.

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

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

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

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

FIG. 19 is a perspective view of the film battery in an inverted state.

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 a main part of the same film battery.

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Video camera (electronic device) 12,52 Printed board 14 Flexible printed board 30 Film battery 31 Positive electrode 32 Negative electrode 33 Polymer solid electrolyte 34 Positive electrode current collector 35 Negative electrode current collector 36 Sealing material 43,44,57,58,61 , 62, 67, 68 Through hole 45, 46, 59, 60, 63, 64, 69, 70 Conductor

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Katsutoshi Amano 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Katsuji Ashida 6-6 Josaicho, Takatsuki-shi, Osaka Co., Ltd. Yuasa Corporation (72) Inventor Hiroshi Kagawa 6-6 Josaicho, Takatsuki-shi, Osaka Yuasa Corporation (56) References JP-A-2-121384 (JP, A) JP-A-6-505592 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 33/12 305 G11B 33/06 H01M 2/10

Claims (1)

(57) [Claims] 1. A battery built in an electronic device, wherein a film battery is used as the battery, and the film battery is closely adhered to a printed circuit board in the electronic device to form a layer. The current is passed through the through-hole and a conductor is inserted therein, and in this configuration, at least a part of the film battery is provided with at least a positive electrode only and a negative electrode only part,
A battery built into an electronic device that has a through-hole passed through this part and a conductor inserted into it to allow current to flow through the printed circuit board.