JP3541057B2 - Batteries incorporated in electronic devices and electronic devices incorporating batteries - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a battery incorporated as a memory backup power supply in an electronic device.
[0002]
[Prior art]
Generally, an electronic device incorporates a primary battery, a secondary battery, a high-capacity capacitor, and the like for memory backup. For example, a video deck has batteries and capacitors built therein for the date, time, broadcast station channel, and memory of a changeover switch.
[0003]
Previously, these were used for a relatively short period of time to prepare for a short-term power outage or power off at night or on regular holidays at retail stores, but now the time is set at the factory and the user can set the time. What is desired is a backup that can be backed up for a considerably long time (at least three months) so that the preset is unnecessary when purchased.
[0004]
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 liquid crystal panel 7 for displaying a counter, date, time, and various modes (for example, auto, manual focus, white balance, etc.), and a date and time. And a switch button 8 for switching the display and switching the mode, and a detachable battery holder 11 for mounting a button battery 10 for memory backup.
[0005]
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 circuit board (hereinafter simply referred to as a board) on which the liquid crystal panel 7 and the changeover switch 8 are mounted. 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. 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, to apply a voltage. . 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.
[0006]
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 this 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 shielding unnecessary radiation (radio waves) emitted from an electronic circuit on the substrate 12 therebelow.
[0007]
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 the variable resistor mounted on the substrate 12 thereunder. The constants and the like can be adjusted by rotating the variable electronic component 19.
[0008]
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 clear 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 serves to limit the charging current flowing into the battery 10 when the conduction of the backflow prevention diode 22 is broken.
[0009]
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 body as described above, but is incorporated in the video camera body from the beginning. It may have a structure.
That is, as shown in FIG. 4, a button battery 23 to which electrode pieces 23a are welded may be directly mounted on the substrate 12, or as shown in FIG. 24 may be mounted. 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]
[Problems to be solved by the invention]
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, the number of parts is increased by the use of the battery holder 11, the structure becomes complicated, and the battery contact It takes a lot of man-hours to mount the contact pieces 13a and 13b on the substrate 12, and the button battery 23 and the capacitor 24 directly mounted on the substrate 12 have sufficient capacity for memory backup. In such a case, the button battery 23 and the capacitor 24 need to be large, which is problematic due to the space in the video camera.
The present invention has been made in view of the above points.
[0011]
[Means for Solving the Problems]
That is, the present invention relates to an electronic device which uses a film battery as a battery for memory backup built in the electronic device, and configures a part of a shield case arranged near an unnecessary radiation source of the electronic device with the film battery. Providing a built-in battery,
The negative electrode current collector of the film battery is fixed by welding a frame base-shaped metal plate having a plurality of legs, and the positive electrode current collector of the film battery is fixed by welding a metal plate piece bent into an L shape. , The leg and the metal plate are configured to be fixed to the printed circuit board of the electronic device by soldering,
A through hole is provided in a part of the film battery so that the variable electronic component mounted on the printed circuit board can be adjusted by inserting an adjusting tool into the through hole while the film battery is fixed to the printed circuit board. is there.
[0012]
[Action]
In the present invention configured as described above, since the electrodes of the film battery are made of metal, unnecessary radiation generated from the electronic circuit can be effectively shielded. The film battery forms a part of the shield case, so that the battery can be efficiently incorporated into a narrow space in the electronic device without increasing the thickness of the shield case, and is conventionally required. Since the battery holder and the battery contact piece are eliminated, the number of parts and the number of steps are reduced accordingly.
Further, in the present invention, the plurality of legs are fixed to the printed circuit board by soldering so as to be fixed to the negative electrode current collector of the film battery by welding using a frame base metal plate having a plurality of legs. With such a configuration, conduction with the printed circuit board can be ensured. Further, by configuring the metal plate in a frame base shape, the gap between the printed board and the shield portion is covered, and unnecessary radiation from the gap can be prevented.
Further, in the present invention, the variable electronic component mounted on the printed circuit board is inserted into the through-hole in a state where the film battery is fixed to the printed circuit board by a configuration in which a through-hole is provided in a part of the film battery. Can be easily adjusted.
[0013]
【Example】
Hereinafter, the embodiment of the present invention will be described with reference to FIGS. 7 to 14, and portions corresponding to those of the above-described conventional example of FIGS. 1 to 5 will be denoted by the same reference numerals, and description thereof will be omitted.
[0014]
7 to 11 show a first embodiment, FIG. 7 is a perspective view of a substrate built in the above-described video camera body, FIG. 8 is a perspective view of the substrate viewed from the back side, and FIG. FIG. 10 is a perspective view of the shield case to be attached, FIG. 10 is a perspective view of the shield case viewed from the back side, and FIG. 11 is a sectional view of the shield case.
[0015]
As apparent from these drawings, in the present invention, a film battery 30 is used as a power supply for memory backup of the IC 20, and the film battery 30 is incorporated as a part of the shield case 16 mounted inside the substrate 12. .
This film battery 30 is a newly developed thin, high-energy-density, high-performance battery whose basic configuration is, as apparent from FIG. 11, a positive electrode (manganese dioxide or the like) 31 and a negative electrode (lithium or the like) 32. A solid polymer electrolyte 33 is disposed between the current collectors, and the positive and negative electrode current collectors (outer body) 34 and 35 made of a metal plate (foil) are sealed with a sealing material 36. Further, an insulating plate 37 is attached to the surface of the positive electrode current collector 34 of the film battery 30.
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.
[0016]
In the embodiment, the film battery 30 constitutes the main surface of the shield case 16, and the legs 17 of the shield case 16 extend and protrude integrally from the negative electrode current collector 35 of the film battery 30. The shield case 16 is fixed to the board 12 by soldering or the like, and is connected to a circuit pattern on the board 12.
Further, a leg 38 is integrally extended from the positive electrode current collector 34 of the film battery 30, and a tip end of the leg 38 is also fixed to the substrate 12 by soldering or the like, and is connected to a circuit pattern of the substrate 12. You.
[0017]
As a result, current is supplied from the film battery 30 to the IC 20 on the substrate 12, and the memory is backed up.
At the same time, unnecessary radiation (radio waves) generated from the electronic circuit on the substrate 12 is effectively shielded by the film battery 30.
[0018]
As described above, in the present invention, attention is paid to the fact that the electrode (current collector) of the film battery is made of a thin plate-shaped conductor, that is, a metal, and this is used as a shield plate to form two birds per stone.
[0019]
As described above, since the thickness t of the film battery 30 is extremely thin, about 0.2 mm, it can be easily incorporated as a power source for memory backup without increasing the thickness of the shield case 16. In particular, the shield case 16 has a flat area with a large area inside the device, and is optimal for disposing a film battery.
[0020]
As described above, by incorporating the film battery 30 into a part of the shield case 16 as a memory backup power source, in the present embodiment, the battery holder 11 for the button battery 10 and the substrate shown in FIG. The battery contact pieces 13a and 13b on the reference numeral 12 become unnecessary, and the button battery 23 and the capacitor 24 as shown in FIGS. 4 and 5 of the conventional example disappear.
[0021]
In the shield case 16, a through hole 18 is formed through the film battery 30 and the insulating plate 37. An adjusting tool 100 such as a screwdriver (driver) is inserted into the through hole 18, and a substrate thereunder is inserted. A variable electronic component 19 such as a variable resistor mounted on the device 12 can be rotated and adjusted. In this case, in the portion of the through hole 18 of the film battery 30, a sealing material 36 'is annularly disposed around the through hole 18 to seal the inside of the battery.
[0022]
12 to 14 show a second embodiment, FIG. 12 is a perspective view of a shield case, FIG. 13 is an exploded perspective view of the shield case seen from the back side, and FIG. 14 is a sectional view of the shield case.
[0023]
In this embodiment, the film battery 30 is combined with a separate metal plate to constitute a part of the shield case 16.
That is, in the drawing, reference numeral 39 denotes a frame base made of a metal plate (for example, a tin plate), on which a plurality of legs 17 are integrally formed to protrude. The projecting piece 40 is fixed to the negative electrode current collector 35 of the film battery 30 by welding.
The leg 38 is formed of a metal plate piece bent in an L-shape. The leg 38 is fixed to the positive electrode current collector 34 of the film battery 30 by welding, and the insulating plate 37 is attached thereon.
[0024]
The shield case 16 according to the present embodiment having the above-described configuration is similar to the above-described first embodiment in that the tips of the legs 17 and 38 are fixed to the substrate 12 by soldering or the like, and the circuit pattern of the substrate 12 is Connected to.
Also, in the shield case 16 of this embodiment, the through hole 18 is formed through the film battery 30 and the insulating plate 37, so that the variable electronic component 19 mounted on the substrate 12 thereunder can be adjusted. The portion of the through hole 18 is sealed with an annular sealing member 36 'as in the first embodiment.
[0025]
In the first and second embodiments, any of a primary battery and a secondary battery may be used as the film battery. However, in the case of a primary battery, it is necessary to replace it like a conventional button battery. However, in the case of a secondary battery, it is more preferable since it is only necessary to insert the battery once.
[0026]
The embodiments of the present invention have been described above, but it goes without saying that the present invention is not limited to the configurations of these embodiments.
[0027]
【The invention's effect】
As described above, the present invention uses a film battery as a battery built into an electronic device, and has a structure in which a part of a shield case is configured with the film battery, thereby enabling the battery to be efficiently used in a narrow space in the electronic device. In addition to being able to be incorporated well, a battery holder and a battery contact piece, which were required in the past, can be eliminated, so that the number of parts and man-hours are reduced by that much, which is advantageous in cost.
In addition, in the present invention, a plurality of legs are soldered to a printed circuit board by using a frame-shaped metal plate having a plurality of legs so as to be fixed to the negative electrode current collector of the film battery by welding. As a result, conduction with the printed circuit board can be ensured. Further, by configuring the metal plate in a frame base shape, the gap between the printed board and the shield portion is covered, and unnecessary radiation from the gap can be prevented.
Further, in the present invention, the variable electronic component mounted on the printed circuit board is inserted into the through-hole in a state where the film battery is fixed to the printed circuit board by a configuration in which a through-hole is provided in a part of the film battery. Can be easily adjusted.
[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 incorporated 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 an explanatory diagram of the first embodiment, and is a perspective view of a printed circuit board built in the video camera.
FIG. 8 is a perspective view of the same as viewed from the back side of the printed circuit board.
FIG. 9 is a perspective view of the shield case attached to the printed circuit board.
FIG. 10 is a perspective view of the same, viewed from the back side of the shield case.
FIG. 11 is a sectional view of the shield case.
FIG. 12 is an explanatory view of the second embodiment, and is a perspective view of a shield case.
FIG. 13 is an exploded perspective view of the same as seen from the back side of the shield case.
FIG. 14 is a sectional view of the shield case.
[Explanation of symbols]
1 video camera (electronic equipment)
12 Printed circuit board 16 Shield case 17 Leg 18 Through hole 19 Variable electronic component 30 Film battery 31 Positive electrode 32 Negative electrode 33 Polymer solid electrolyte 34 Positive current collector 35 Negative current collector 36 Sealing material

Claims (3)

A battery incorporated in an electronic device, wherein a film battery is used as the battery, and the film battery is incorporated in an electronic device constituting a part of a shield case arranged near an unnecessary radiation source of the electronic device. In batteries,
The negative electrode current collector of the film battery is fixed by welding a frame base metal plate having a plurality of legs, and the positive electrode current collector of the film battery is formed by welding a metal plate piece bent into an L shape. Affixed and configured to fix the leg and the metal plate piece to a printed circuit board of the electronic device by soldering,
A through hole is provided in a part of the film battery, and the variable electronic component mounted on the printed board is adjusted by inserting an adjusting tool into the through hole in a state where the film battery is fixed to the printed board. A battery built in an electronic device, wherein the battery is made available. 2. A battery built in an electronic device according to claim 1, wherein a sealing material is annularly disposed around the through hole. In an electronic device incorporating a battery, a film battery is used as the battery, and the electronic device incorporates a battery that constitutes a part of a shield case arranged near an unnecessary radiation source of the electronic device with the film battery. ,
The negative electrode current collector of the film battery is fixed by welding a frame base metal plate having a plurality of legs, and the positive electrode current collector of the film battery is formed by welding a metal plate piece bent into an L shape. Affixed and configured to fix the leg and the metal plate piece to a printed circuit board of the electronic device by soldering,
A through hole is provided in a part of the film battery, and the variable electronic component mounted on the printed board is adjusted by inserting an adjusting tool into the through hole in a state where the film battery is fixed to the printed board. Electronic equipment with a built-in battery, characterized in that it is made possible.

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