JP2001111242A - Portable electronic devices - Google Patents

Abstract

(57) [Problem] To achieve a reduction in size and thickness by eliminating a space for a battery in a device main body. SOLUTION: An apparatus main body 2 and an outer casing of the apparatus main body 2,
Specifically, it is provided with a protector 3 attached in contact with the housing 2a and the lid 2b. The protector 3 attached to the outer casing of the device main body 2 includes a polymer battery 8 serving as a driving power source for the driving unit 6 and the like housed in the device main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electronic device in which an accessory is attached to an outer casing of a device main body.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for smaller and thinner portable electronic devices such as portable tape recorders. 2. Description of the Related Art Conventionally, a portable electronic device has responded to the above-mentioned demand by efficiently and efficiently using a storage space in a device main body of a battery as a driving power source in order to realize a reduction in size and thickness.

[0003]

However, there is a limit to the effective use of the battery storage space in the above-described device main body. As long as the battery serving as the driving power source is stored in the device main body, the total thickness of the electronic device is limited. The size has an effect.

[0004] In recent years, portable electronic devices such as those described above have been integrated with the main body of the device for the purpose of buffering shocks such as when dropped and improving portability.
A large number of portable electronic devices having accessories that can be detachably attached, specifically, a protector that is attached to the device body, a holder for attaching to a user's body, and the like, and a carrying case are provided as accessories. I have. Even when the portable electronic device is used, these attached members are used while being attached to and in contact with the device main body.

In view of the above, the present invention incorporates a polymer battery serving as a drive power supply into an accessory member attached to a device main body, thereby eliminating the need for a space for a battery in the device main body and achieving a reduction in size and thickness. It is an object to provide a portable electronic device.

[0006]

SUMMARY OF THE INVENTION A portable electronic device according to the present invention having the above-described object is provided with a device main body and an attachment member attached to an outer casing of the device main body. The accessory member has a built-in polymer battery as a drive power source for the portable electronic device.

[0007] Since the polymer battery has no fear of electrolyte leakage, a laminated film or the like can be used as an exterior material, and the degree of freedom in shape is high.

Therefore, in the portable electronic device according to the present invention, the polymer battery serving as the driving power source is provided not in the device main body but separately from the device main body, and is attached to an attached member which is attached in contact with the outer casing of the device main body. By incorporating the device, the external shape of the device body can be reduced in size and thickness.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a portable electronic device according to the present invention will be described in detail with reference to the drawings. In the following description, an example will be described in which the present invention is applied to a tape recorder device in which a tape cassette containing a magnetic tape as a recording medium is mounted.

As shown in FIG. 1, the tape recorder device 1 includes an equipment main body 2 and a protector 3 attached to an outer peripheral surface of the equipment main body 2. The tape recorder 1 reproduces a signal recorded on a magnetic tape,
The signal is recorded on the magnetic tape.

As shown in FIGS. 1 and 2, the apparatus main body 2 includes a housing 2a serving as an outer housing, and a lid 2b rotatably attached to the housing 2a. In the device body 2,
A plurality of operation buttons 4 for selecting an operation mode such as a constant speed running mode, a stop mode, a fast forward mode, and a rewind mode of the magnetic tape in the tape cassette 11 are provided on the outer side surface of the housing 2a.

The space between the device main body 2 and the cover 2b on the upper surface of the housing 2a is opened and closed by the cover 2b, and forms a cassette mounting section 5 on which the tape cassette 11 is mounted. Although not shown in detail, the cassette mounting portion 5 includes a pair of reel drive shafts that rotationally drive a tape reel of the tape cassette 11 in which the magnetic tape is wound around the housing 2a, and the magnetic tape is sandwiched between the pair of reel drive shafts. A pair of capstan shafts for operating at a constant speed, positioning pins for positioning the mounting position of the tape cassette 11, and the like are provided with a recording / reproducing unit in which a magnetic head is provided on the lid 2b.

The apparatus main body 2 further includes a drive unit 6 for driving the above-mentioned reel drive shaft for rotating and driving the magnetic tape in the tape cassette 11 mounted on the cassette mounting unit 5 in the housing 2a. A circuit board on which a transmitting / receiving unit for transmitting an audio signal of a magnetic tape read by a head or receiving a control signal from an operation button 4 provided on a remote control device or an apparatus main body 2 (not shown) is configured. 7 are stored.

The protector 3 is composed of a cord-like member attached to the outer peripheral surface of the main body 2 as shown in FIG. 1, for example. The protector 3 acts as a cushioning material for protecting the device main body 2 by absorbing an impact to the device main body 2 generated at the time of dropping or collision. The protector 3 may be integrally attached to the device main body 2 with an adhesive or the like, or may be detachably attached to the device main body 2. In addition, protector 3
If it can be attached to and detached from the device main body 2, it can be attached to another tape recorder device of the same size or to other portable electronic devices.

As shown in FIGS. 1 and 2, the protector 3 is covered with a polymer battery 8 (polymer secondary battery) having a positive electrode material and a negative electrode material, for example, with a cover member 9 made of synthetic resin. It is composed. The polymer battery 8 serves as a drive power source for the device main body 2.

Hereinafter, the polymer battery 8 will be described.

The polymer battery 8 is a non-aqueous electrolyte battery (a so-called lithium ion secondary battery), for example, a solid electrolyte battery, a solid electrolyte battery, or a gel electrolyte battery. Specifically, a battery element in which a solid electrolyte or a gel electrolyte is disposed between a positive electrode active material layer and a negative electrode active material layer, and an exterior material formed by folding a sheet-like laminate film into two The battery element is housed in an exterior material, and the periphery is sealed by heat welding.

The external shape is arbitrary, but for example, it is preferably formed into a shape that can be stored in the protector 3 shown in FIG. 1, specifically, a thin string shape.

The battery element is provided with a negative electrode terminal lead electrically connected to the negative electrode constituting the battery element and a positive electrode terminal lead electrically connected to the positive electrode. , Is drawn out of the exterior material and is electrically connected to the device main body 2.

The positive electrode terminal lead and the negative electrode terminal lead are joined to the respective current collectors of the positive electrode and the negative electrode. The material is such that the positive electrode terminal lead does not dissolve at a high potential, for example, aluminum, titanium, or these. And the like. Copper, nickel,
Alternatively, these alloys can be used.

For the battery element, a complete solid electrolyte containing no solvent can be used as the solid electrolyte.

As a completely solid electrolyte containing no solvent,
A polymer solid electrolyte using an ion-conductive polymer, furthermore, an ion-conductive ceramic, an inorganic solid electrolyte using an ion-conductive glass, or the like can be used.

For example, to form a solid polymer electrolyte,
A polymer complex in which an electrolyte is dissolved in a polymer matrix having an ether bond such as polyethylene oxide can be used. At this time, as the electrolyte, an electrolyte which is also used in a normal battery electrolyte can be used, and LiPF ₆ , LiBF ₄ , LiA
sF ₆ , LiClO ₄ , LiCF ₃ SO ₃ , LiN (SO ₂
CF ₃ ) ₂ , LiC (SO ₂ CF ₃ ) ₃ , LiAlCl ₄ , L
A lithium salt such as iSiF ₆ can be used.

As the polymer matrix, not only the above-mentioned linear polymer such as polyethylene oxide, but also
Comb-type polymers having a side chain structure, or those having an inorganic polymer structure such as a siloxane structure or a polyphosphazene structure in the main chain can also be used, but, of course, are not limited to these. .

Alternatively, a normal solid electrolyte battery or a gel electrolyte battery can be used. For example, when considering a solid electrolyte battery, or a gel electrolyte battery, as the polymer material used for the polymer solid electrolyte, silicon gel, acrylic gel, acrylonitrile gel, polyphosphazene modified polymer, polyethylene oxide, polypropylene oxide, and Examples of these composite polymers, crosslinked polymers, modified polymers, and the like, or fluorine-based polymers include poly (vinylidene fluoride), poly (vinylidene fluoride-co-hexafluoropropylene), and poly (vinylidene fluoride-co-tetrafluoroethylene). ), Poly (vinylidenefluoride-co-trifluoroethylene), and the like, and mixtures thereof can be used, but are not limited thereto.

The solid electrolyte or the gel electrolyte laminated on the positive electrode active material layer or the negative electrode active material layer is a solution composed of a polymer compound, an electrolyte salt and a solvent, and (in the case of a gel electrolyte, a plasticizer). It is obtained by impregnating the positive electrode active material layer or the negative electrode active material layer, removing the solvent, and solidifying. A part of the solid electrolyte or the gel electrolyte laminated on the positive electrode active material layer or the negative electrode active material layer is impregnated into the positive electrode active material layer or the negative electrode active material layer to be solidified. In the case of a crosslinked system, it is then solidified by crosslinking with light or heat.

The gel electrolyte comprises a plasticizer containing a lithium salt and 2 to 30% by weight of a matrix polymer. At this time, esters, ethers, carbonates and the like can be used alone or as one component of a plasticizer.

In preparing the gel electrolyte, various polymers used for forming the gel electrolyte can be used as the matrix polymer for gelling such carbonates. From the viewpoint of stability, it is desirable to use a fluorine-based polymer such as poly (vinylidene fluoride) or poly (vinylidene fluoride-co-hexafluoropropylene).

The polymer solid electrolyte is composed of a lithium salt and a polymer compound that dissolves the lithium salt. Examples of the polymer compound include ether polymers such as poly (ethylene oxide) and the same crosslinked product, and poly (methacrylate) ester polymers. , Acrylate polymers, fluorine polymers such as poly (vinylidenefluoride) and poly (vinylidenefluoride-co-hexafluoropropylene) can be used alone or as a mixture. It is desirable to use a fluorinated polymer such as poly (vinylidene fluoride) or poly (vinylidene fluoride-co-hexafluoropropylene).

As the lithium salt to be contained in such a gel electrolyte or a solid polymer electrolyte, a lithium salt used in a usual battery electrolyte can be used. Examples of the lithium compound (salt) include the following. But are not limited to these.

For example, lithium chloride, lithium bromide,
Lithium iodide, lithium chlorate, lithium perchlorate,
Lithium bromate, lithium iodate, lithium nitrate, tetrafluoro lithium borate, lithium hexafluorophosphate, lithium acetate, bis (trifluoromethanesulfonyl) imide lithium, LiAsF _6, LiCF ₃ S
O ₃ , LiC (SO ₂ CF ₃ ) ₃ , LiAlCl ₄ , LiS
iF _{6 and the} like.

These lithium compounds may be used alone or as a mixture of a plurality of them.
F ₆ and LiBF ₄ are desirable from the viewpoint of oxidation stability.

As the concentration for dissolving the lithium salt, a gel electrolyte can be used in a plasticizer at 0.1 to 3.0 mol, but preferably at 0.5 to 2.0 mol / l. .

As the negative electrode material of the polymer battery 8,
A material capable of doping and undoping lithium can be used. As a constituent material of such a negative electrode, for example, a non-graphitizable carbon-based material or a carbon material such as a graphite-based material can be used. More specifically, pyrolytic carbons, cokes (pitch coke, needle coke, petroleum coke), graphites, glassy carbons, and organic polymer compound fired bodies (phenolic resin, furan resin, etc.) at an appropriate temperature Carbon materials such as fired and carbonized), carbon fiber, and activated carbon can be used. In addition, as a material that can be doped with and dedoped with lithium, a polymer such as polyacetylene and polypyrrole and an oxide such as SnO ₂ can also be used. When forming a negative electrode from such a material, a known binder or the like can be added.

The positive electrode depends on the type of the intended battery.
A metal oxide, a metal sulfide, or a specific polymer can be used as the positive electrode active material. For example, when configuring a lithium ion battery, the positive electrode active material may be T
Lithium-free metal sulfides or oxides such as iS ₂ , MoS ₂ , NbSe ₂ , V ₂ O ₅ , and LiMO ₂ (where M represents one or more transition metals, and x depends on the charge / discharge state of the battery. However, it is usually 0.05 or more and 1.10 or less.). As the transition metal M constituting the lithium composite oxide, Co, Ni, Mn and the like are preferable. A specific example of such a lithium composite oxide is LiCo.
O ₂ , LiNiO ₂ , LiNi _y Co _1-y O ₂ (where 0 <y
<1. ), LiMn ₂ O _{4 and the} like. These lithium composite oxides can generate high voltage,
It becomes a positive electrode active material excellent in energy density. A plurality of these positive electrode active materials may be used in combination for the positive electrode. In forming a positive electrode using the above-described positive electrode active material, a known conductive agent, a binder, and the like can be added.

In the polymer battery 8, the above-described positive electrode and negative electrode are cut into an elongated shape, and these are solid electrolyte,
Alternatively, the battery element is formed by laminating via a gel electrolyte, and is sealed in an exterior material.

The exterior material is formed of, for example, a heat-sealing sheet-like laminated film composed of three layers: an exterior protective layer, an aluminum layer, and a heat welding layer (the innermost layer of the laminate). The heat-welding layer is intended for encapsulation by heat-sealing when enclosing the battery element, and uses a plastic film. For the plastic film, polyethylene, polypropylene, polyethylene terephthalate, or the like is used, and any material may be used as long as it is a thermoplastic plastic material.

The polymer battery 8 has been specifically described above. However, since the polymer battery 8 has a high degree of freedom in shape and can be formed into an elongated shape as described above, the device main body 2 of the tape recorder device 1 can be formed. The tape recorder device 1 can be suitably used as a drive power source for the tape recorder device 1 by attaching the protector 3 to the device main body 2 by making it elongated in accordance with the size of the string-shaped protector attached to the tape recorder device.

In the polymer battery 8 described above, a battery element is formed by laminating a positive electrode and a negative electrode via a solid electrolyte or a gel electrolyte, but the present invention is not limited to such a configuration. In the polymer battery 8, for example, each of a positive electrode and a negative electrode may be processed into a bellows shape, and these may be laminated to constitute a battery element. The polymer battery 8 can improve the shock absorption of the protector 3 by processing the positive electrode and the negative electrode constituting the battery element in a bellows shape. Further, in the polymer battery 8, for example, the positive electrode and the negative electrode may be concentrically formed, specifically, processed into a concentric shape with the negative electrode inside and the positive electrode outside, to form a battery element.

The tape recorder 1 to which the present invention is applied
In the above, the polymer battery 8 serving as a driving power source is built in the protector 3 attached to the outside of the device main body 2 as described above, so that the storage space for the battery in the device main body 2 becomes unnecessary, and the size of the device main body 2 is reduced. And a reduction in thickness can be achieved.

In the tape recorder 1 described above, the protector 3 that protects the main body 2 of the apparatus from an impact has been described as an example in which the polymer battery 8 is built in. However, the present invention is limited to such a configuration. Not something. The tape recorder device 1 may be one in which a sheet-shaped polymer battery 22 is built in a carrying case 21 for accommodating the tape recorder device 1 as shown in FIG. 3, for example, and the polymer battery 22 is used as a driving power source. In the carrying case 21, a cord 23 for charging the built-in polymer battery 22 is provided. Further, in the tape recorder device 1, a holder attached to the outer casing of the tape recorder device 1 separately from the device main body 2, a concavo-convex forming member attached for the purpose of decorating the outer shape of the device main body 2, and the like. Equipment body 2 attached to
Any device may be used as long as it has a built-in polymer battery that is a driving power source for the device.

Furthermore, in the above-described embodiment, a portable tape recorder using a magnetic tape as a recording medium has been exemplified as an example to which the present invention is applied. However, it is needless to say that the present invention is not limited to this. In addition, the present invention is applicable to various types of portable recording and / or reproducing apparatus for recording and reproducing data on and from media other than magnetic tapes, for example, magnetic disks, video camera apparatuses, portable telephones and the like. The present invention is also applicable to portable electronic devices.

[0043]

As described above in detail, according to the portable electronic device of the present invention, the polymer battery as the drive power source is built in the accessory attached to the outer casing, and the storage space for the battery is provided in the main body of the device. By eliminating the requirement, the electronic device itself can be reduced in size and thickness.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tape cassette device.

FIG. 2 is a diagram showing a schematic configuration of a tape cassette device.

FIG. 3 is a perspective view showing another embodiment of the tape cassette device.

[Explanation of symbols]

1 tape recorder device, 2 device body, 3 protector, 8 (22) polymer battery, 11 tape cassette

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 24, 1999 (1999.11.
24)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

The polymer battery 8 is a non-aqueous electrolyte battery (so-called lithium ion secondary battery or lithium secondary battery), for example, a solid electrolyte battery or a gel electrolyte battery. Specifically, a battery element in which a solid electrolyte or a gel electrolyte is disposed between a positive electrode active material layer and a negative electrode active material layer, and an exterior material formed by folding a sheet-like laminate film into two The battery element is housed in an exterior material, and the periphery is sealed by heat welding.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

For the battery element, a solid electrolyte containing no solvent can be used as the solid electrolyte.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

As the solid electrolyte containing no solvent, a polymer solid electrolyte using an ion conductive polymer, furthermore, an ion conductive ceramic, an inorganic solid electrolyte using an ion conductive glass, or the like can be used.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

Alternatively, an ordinary gel electrolyte battery can be used. For example, when considering a gel electrolyte battery, as the polymer material used for the gel electrolyte, silicon gel, acrylic gel, acrylonitrile gel, polyphosphazene-modified polymer, polyethylene oxide, polypropylene oxide, and a composite polymer or cross-linked thereof For example, poly (vinylidene fluoride), poly (vinylidene fluoride-co-hexafluoropropylene), poly (vinylidene fluoride)
-co-tetrafluoroethylene), poly (vinylidenefluoride-co-trifluoroethylene), and the like and various mixtures thereof can be used, but are not limited thereto.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction contents]

As the negative electrode material of the polymer battery 8,
A material capable of doping and undoping lithium can be used. As a constituent material of such a negative electrode, for example, a non-graphitizable carbon-based material or a carbon material such as a graphite-based material can be used. More specifically, pyrolytic carbons, cokes (pitch coke, needle coke, petroleum coke), graphites, glassy carbons, and organic polymer compound fired bodies (phenolic resin, furan resin, etc.) at an appropriate temperature Carbon materials such as fired and carbonized), carbon fiber, and activated carbon can be used. In addition, as a material that can be doped with and dedoped with lithium, a polymer such as polyacetylene and polypyrrole and an oxide such as SnO ₂ can also be used. When forming a negative electrode from such a material, a known binder or the like can be added. Alternatively, lithium metal can be used as a negative electrode material.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Rumi Nakano, Inventor 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Toshikazu Yasuda 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation F term (reference) 4E360 AB42 AD20 GA52 GB14 GB95 5H020 AA06 AS13 MM31

Claims (3)

[Claims] 1. An electronic apparatus comprising: a device main body; and an accessory member attached in contact with an outer casing of the device main body, wherein the accessory member has a built-in polymer battery serving as a driving power supply. Portable electronic devices. 2. The portable electronic device according to claim 1, wherein the accessory member is a protector that is attached to an outer casing of the device main body and protects the device main body. 3. The portable electronic device according to claim 1, wherein the attachment member is detachably attached to the device main body.