JP2007019958A - Coil antenna instrument for wave ceptor clock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil antenna instrument of low cost for a wave ceptor clock which has a coil antenna property and the functionality of freely bending, in the wave ceptor clock which takes out luxury on design by using a metal cabinet or metal plating on a resin cabinet. <P>SOLUTION: A submagnetic path 5 is formed of a magnetic substance sheet of a low price which is composed of the mixture of soft magnetic material powder and an organic binder, and has the functionality of freely bending. The submagnetic path 5 is inserted between the transmission and the reception of a coil antenna 1 and a metal cabinet (a resin cabinet on which metal plating is performed). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coil antenna device for transmitting or receiving a radio signal in a low and medium wave band, and more particularly to a coil antenna device for a radio timepiece.

  2. Description of the Related Art Conventionally, various devices such as a device, a system, and a terminal for transmitting, receiving, or transmitting / receiving a low-medium band radio signal are used. For example, AM radio is a typical system. In recent years, miniaturization and versatility of communication terminals have progressed, and a variety of products have been developed for terminals using low and medium frequency bands. For example, there is a radio timepiece that transmits, receives, or transmits / receives data by electromagnetic waves. These radio timepieces have an antenna that transmits, receives, or transmits / receives electromagnetic waves, and corrects the time using electromagnetic waves (see Patent Document 1 and Patent Document 2).

  Other relatively new systems include an automobile immobilizer, an automobile or residential remote keyless entry system (Patent Document 3), and an RFID system.

  Patent Document 4 discloses a coil antenna that uses a coil antenna in a low / medium wave region and a sintered ferrite core in a vehicle keyless system. Coil antennas using sintered ferrite cores are marketed for impact resistance that prevents core cracks, etc., and diversification of shapes (for example, free shape, multi-axis antenna directivity, lightness, shortness, and size) Is strongly requested by. However, the coil antenna using the sintered ferrite core has a problem that the impact resistance and the manufacturability are poor.

  In particular, recent mobile phone keys can be opened and closed with the key in the pocket. The use conditions that are always carried in a pocket are strongly required to be thin and light and to have high impact resistance against dropping impact. However, the coil antenna using the sintered ferrite core has a problem in that the shock resistance is insufficient, the core is easily damaged, and becomes a fatal failure factor. In addition, if the sintered ferrite core is made long or thin, it tends to warp, and a large press proportional to the size is required for the finishing of the press and the machining after sintering for flatness. There was a problem in the production process.

US Pat. No. 6,134,188 JP-A-10-206561 US Pat. No. 6,678,851 JP 2003-249816 A

  Studies have been made to solve the above-described problem of Patent Document 4. When ceramic materials such as ferrite are thin, core cracks are likely to occur, and impact resistance cannot be ensured. Therefore, lamination of an amorphous core or a metal-based core has been attempted. However, there is a problem that the material is expensive, the hardness is high and the processing is difficult, and the mass productivity and the cost are high.

  In addition, plastic ferrites combined with resin were also studied, and some impact and manufacturability improvements were made. However, in pursuit of the characteristics as a coil antenna, it is necessary to improve the filling rate of ferrite, which causes a problem that the impact resistance is deteriorated.

  Furthermore, there is an increasing demand for radio timepieces that use a metal casing or resin casing with metal plating to give a luxurious design. The metal casing (metal-plated resin casing) used here is placed near the coil antenna, interferes with the coil antenna, and reduces the inductance of the coil antenna. As a result, the tuning frequency of the coil antenna varies, and the characteristics of the coil antenna deteriorate.

  In addition, when the metal casing (metal-plated resin casing) interferes with the coil antenna, a high-frequency current flows through the nearby metal, the Q-value characteristics of the antenna coil deteriorate, and the antenna sensitivity decreases. Alternatively, by inserting a metal casing (metal-plated resin casing) between transmission and reception of the coil antenna, electromagnetic waves are shielded, the transmission and reception strength of the coil antenna is reduced, and the characteristics of the coil antenna are deteriorated.

  The present invention has been made to solve the above-mentioned problems, and its technical problem is a radio-controlled timepiece that uses a metal casing or a resin casing with metal plating to give a design luxury. The present invention is to provide a low-priced coil antenna device for a radio-controlled timepiece having necessary coil antenna characteristics and a function that can be freely bent.

  A first invention for achieving the above object is a coil antenna device for a radio clock comprising a magnetic core and a coil wound around the magnetic core, and is installed in the vicinity of the coil antenna and the coil antenna. A magnetic sheet made of a mixture of a soft magnetic powder and an organic binder that is flexible and can be freely bent is provided between the metal casing or the resin casing with metal plating. This is a coil antenna device for a radio-controlled timepiece arranged as a road.

  According to a second invention for achieving the above object, the soft magnetic powder is made of iron aluminum silicon alloy (Sendust), iron nickel alloy (permalloy), iron cobalt alloy, iron cobalt silicon alloy, iron silicon vanadium alloy, iron Coil antenna for a radio wave clock made of a soft magnetic material of cobalt boron alloy, cobalt-based amorphous alloy, iron-based amorphous alloy, oxide magnetic powder (ferrite), carbonyl iron, molybdenum permalloy, or pure iron dust, or a combination thereof. Device.

  According to a third invention for achieving the above object, the organic binder is a polyester resin, polyvinyl chloride resin, polyvinyl butyral resin, polyurethane resin, cellulose resin, nitrile butadiene rubber, styrene butadiene rubber. Thermosetting resins such as thermoplastic resins or copolymers thereof, epoxy resins, phenol resins, amide resins, imide resins, and other thermosetting resins, or organic flame retardant halides, brominated polymers, or any of them This is a coil antenna device for a radio-controlled timepiece composed of a combination of

  A fourth invention for achieving the above object is a coil antenna device for a radio timepiece in which the magnetic core of the coil antenna is a ferrite core.

  A fifth invention for achieving the above object is a coil antenna device for a radio timepiece in which the magnetic core of the coil antenna is an amorphous core.

  According to a sixth aspect of the present invention for achieving the above object, the magnetic core of the coil antenna is an insulating soft magnetic material comprising a mixture of the soft magnetic powder and the organic binder, wherein the soft magnetic powder is , Iron aluminum silicon alloy (Sendust), iron nickel alloy (permalloy), iron cobalt alloy, iron cobalt silicon alloy, iron silicon vanadium alloy, iron cobalt boron alloy, cobalt amorphous alloy, iron amorphous alloy, oxide magnetic powder ( Ferrite), carbonyl iron, molybdenum permalloy, soft magnetic materials such as pure iron dust, or a combination thereof, and the organic binder is polyester resin, polyvinyl chloride resin, polyvinyl butyral resin, polyurethane resin, cellulose Resin, nitrile-butadiene rubber, styrene-butadiene rubber, etc. Thermoplastic resins or copolymers thereof, epoxy resins, phenol resins, amide resins, imide resins, and other thermosetting resins, or organic flame retardant halides, brominated polymers, or combinations thereof It is a coil antenna device for radio timepieces using the above-mentioned magnetic core.

  A seventh invention for achieving the above object is a radio-controlled timepiece coil antenna apparatus in which the soft magnetic powder uses the magnetic core of a flat or needle-like powder.

  An eighth invention for achieving the above object is for a radio-controlled timepiece using the magnetic core, wherein the soft magnetic powder is a powder coated with an oxide film, an organic binder or the like, or a conductive powder. This is a coil antenna device.

  According to a ninth aspect of the invention for achieving the above object, the magnetic core is provided with a dielectric layer on at least one surface of the insulating soft magnetic layer, and the insulating soft magnetic layer is formed of the soft magnetic powder. And the organic binder, and the dielectric layer is a coil antenna device for a radio clock using a core containing dielectric powder and the organic binder.

  In a tenth aspect of the invention for achieving the above object, the magnetic core has an insulating soft magnetic layer, and the insulating soft magnetic layer includes the soft magnetic powder, the dielectric powder, and the organic This is a coil antenna device for a radio timepiece using a core containing a binder.

  An eleventh invention for achieving the above object is a coil antenna device for a radio timepiece having flexibility.

  A twelfth invention for achieving the above object is a coil antenna device for a radio-controlled timepiece in which the shape of the magnetic core is a flat plate.

  According to the present invention, a low-priced magnetic material sheet having a function of being freely bent between a coil antenna and a metal housing (metal-plated resin housing) made of a mixture of soft magnetic powder and an organic binder. Is inserted to stabilize the inductance by the yoke effect. Further, by separating the interference between the coil antenna and the metal casing (metal-plated resin casing), deterioration of the Q value characteristic is suppressed. Furthermore, since the apparent impedance increases with respect to the spatial impedance of the metal casing (metal-plated resin casing), the electromagnetic shielding effect is suppressed, and the transmission rate of transmission / reception signals from the coil antenna is improved.

  As a result, it has the necessary coil antenna characteristics and the ability to bend freely in a radio timepiece that uses a metal case or resin case with metal plating to give it a luxurious design. A coil antenna device for a radio timepiece can be provided.

  A coil antenna device for a radio timepiece according to the best mode for carrying out the present invention will be described in detail below with reference to the drawings.

  FIG. 1 is an external cross-sectional view of a coil antenna device for a radio timepiece according to the present invention. 1A is a top view, FIG. 1B is a bottom view, and FIG. 1C is an AA cross-sectional view (when a metal case is provided).

  The coil antenna device for a radio timepiece according to the best mode for carrying out the present invention is manufactured as follows. A 2400T polyurethane wire (wire diameter: 0.03 mm) 2 is wound around an amorphous magnetic core 3 laminated in a square plate shape of 3 × 2.8 × 15.7 mm to produce a coil antenna 1. Next, the sub magnetic path 5 is arranged in the metal case 4 of the watch.

  The secondary magnetic path 5 is formed of a flexible composite material composed of soft magnetic powder and an organic binder. In the best mode of the present invention, an iron silicon aluminum alloy powder is used as the soft magnetic powder. The soft magnetic powder may be another powder. For example, the soft magnetic powder may be carbonyl iron, ferrite powder, or pure iron powder. The soft magnetic powder may be a powder made of iron-nickel-cobalt alloy, cobalt-based amorphous alloy, iron-based amorphous alloy, or molybdenum permalloy. Further, the soft magnetic powder may be a combination of the above-mentioned powders. In either case, a material having a high high-frequency magnetic permeability is selected so that the coil antenna characteristics necessary for the coil antenna device for a radio timepiece can be satisfied even if it is freely bent.

  In the best mode for carrying out the present invention, the soft magnetic powder is a flat powder. Each powder has an aspect ratio of 5 or more and a particle size of about 35 μm. The condition of the soft magnetic powder is determined by experimentation of a condition for freely bending the sheet-like shape and satisfying necessary coil antenna characteristics.

  In addition, the coil antenna device for a radio timepiece of the present invention uses a flexible material in order to give a function of being freely bent. Furthermore, it is easy to bend by making it into the shape of a flat plate shape and making it easy to make it thin.

  The insulator layer formed on each surface of the soft magnetic powder is made of a nonmagnetic material. Specifically, the insulator layer is an oxide film, and is formed by annealing a soft magnetic powder. Further, the insulator layer may be formed of an organic binder. When the insulator layer is formed of an organic binder, the organic binder may be the same as or different from the hybrid organic binder.

  In the best mode for carrying out the present invention, the organic binder (included in the hybrid) is chlorinated polyethylene, to which a titanate coupling agent is added. Further, in place of the titanate coupling agent, a silane coupling agent or an aluminate coupling agent may be used, or a coupling agent may not be used. For example, the blending ratio of the soft magnetic powder in these composites is 80% by weight, and the total blending ratio of the organic binder and the coupling agent is 20% by weight. In order to provide coil antenna characteristics for practical use and to make the magnetic core flexible, the blending ratio of the soft magnetic powder in the hybrid is preferably 60% by weight to 95% by weight. The blending ratio of the organic binder is preferably 5% by weight or more and 40% by weight or less. When a coupling agent is used, the blending ratio in the mixture of the coupling agent is preferably 5% by weight or less. These blending ratios are determined from the characteristics required for the coil antenna device for a radio timepiece. Further, the material of the secondary magnetic path is selected from the viewpoint of enabling low-cost material design.

  In addition, rubber hardness was measured using a type A durometer for the magnetic core of the soft magnetic powder prepared from the hybrid in the above range in accordance with JIS K6253. From the results, it was confirmed that all the magnetic cores of the produced soft magnetic powder had a rubber hardness of 60 or more.

  Moreover, it was confirmed that the tensile strength measured according to JIS K6263 is 3.8 MPa in all cases.

  The magnetic core of soft magnetic powder prepared using these characteristics as a guideline for material design is mounted on the coil antenna, the coil antenna device is manufactured, mounted on the radio clock, and the reception sensitivity characteristics with and without the secondary magnetic path are compared. did. Specifically, the reception sensitivity characteristics of the coil antenna were measured in the case where the timepiece metal case 4 was placed on the side of the secondary magnetic path 5 in FIG. As a result, the receiving sensitivity of the coil antenna with the sub magnetic path 5 improved by about 2 dB when mounted on a timepiece having the metal case 4 as compared with a conventional coil antenna without the sub magnetic path 5.

  The sub magnetic path 5 of the present invention formed of a low-cost magnetic material sheet having a function of being freely bent and made of a mixture of soft magnetic powder and an organic binder is inserted between the coil antenna 1 and the metal case 4. As a result, the inductance was stabilized by the yoke effect.

  Moreover, the interference of the coil antenna 1 and the metal case 4 can be separated by inserting the sub magnetic path 5 of the present invention. As a result, the deterioration of the Q value characteristic was suppressed.

  Furthermore, the apparent impedance was raised with respect to the spatial impedance of the metal case 4 by inserting the sub magnetic path 5 of the present invention. As a result, the electromagnetic shielding effect was suppressed, and the transmission rate of transmission / reception signals from the coil antenna 1 was improved.

  It has been confirmed that the magnetic core of the coil antenna of the present invention is suitable for a coil antenna device for a radio timepiece having a high-frequency magnetic permeability and a ferrite core and an amorphous core.

  The soft magnetic powder of the present invention is used by applying an insulating coating with an oxide film, an organic binder or the like, or by using a conductive powder magnetic core, thereby suppressing the electromagnetic shielding effect. Realized the device.

  The magnetic core of the powder is provided with a dielectric layer on at least one surface of the insulating soft magnetic layer. The insulating soft magnetic layer includes soft magnetic powder and an organic binder, and the dielectric layer is a dielectric layer. A similar effect was achieved by using a magnetic core containing body powder and an organic binder.

  In addition, the powder magnetic core has an insulating soft magnetic layer, and the insulating soft magnetic layer has the same effect by using a magnetic core containing soft magnetic powder, dielectric powder and an organic binder. I played.

  As described above, in the radio timepiece that uses a metal casing or resin casing with metal plating according to the present invention to create a luxurious design, the required coil antenna characteristics and the ability to bend freely It is possible to provide a low-price coil antenna device for a radio timepiece.

1 is an external cross-sectional view of a coil antenna device for a radio timepiece according to the present invention. 1A is a top view, FIG. 1B is a bottom view, and FIG. 1C is an AA cross-sectional view (when a metal case is present).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil antenna 2 Polyurethane wire 3 Laminated amorphous core 4 (Clock) metal case 5 Sub magnetic path 6 Core 7 Hobin

Claims (12)

  In a radio timepiece coil antenna device comprising a magnetic core and a coil antenna having a coil wound around the magnetic core, the coil antenna and a metal casing or a metal-plated resin casing installed in the vicinity of the coil antenna A coil for a radio-controlled timepiece, wherein a magnetic sheet made of a mixture of a soft magnetic powder having flexibility and being freely bent and an organic binder is disposed as a sub-magnetic path of the coil antenna. Antenna device.   The soft magnetic powder is composed of iron aluminum silicon alloy (Sendust), iron nickel alloy (permalloy), iron cobalt alloy, iron cobalt silicon alloy, iron silicon vanadium alloy, iron cobalt boron alloy, cobalt based amorphous alloy, iron based amorphous alloy. 2. The coil antenna device for a radio-controlled timepiece according to claim 1, which is made of any one of a soft magnetic material such as oxide magnetic powder (ferrite), carbonyl iron, molybdenum permalloy, or pure iron compact, or a combination thereof.   The organic binder is a thermoplastic resin such as polyester resin, polyvinyl chloride resin, polyvinyl butyral resin, polyurethane resin, cellulose resin, nitrile butadiene rubber, styrene butadiene rubber, or a copolymer thereof, epoxy. 2. A thermosetting resin such as a resin, a phenol resin, an amide resin or an imide resin, or a halide or brominated polymer which is an organic flame retardant, or a combination thereof. Coil antenna device for radio clock.   The coil antenna device for a radio timepiece according to claim 1, wherein the magnetic core of the coil antenna is a ferrite core.   The coil antenna device for a radio-controlled timepiece according to claim 1, wherein the magnetic core of the coil antenna is an amorphous core.   The magnetic core of the coil antenna is an insulating soft magnetic material made of a mixture of the soft magnetic powder and the organic binder, and the soft magnetic powder is made of iron aluminum silicon alloy (Sendust), iron nickel alloy ( Permalloy), iron cobalt alloy, iron cobalt silicon alloy, iron silicon vanadium alloy, iron cobalt boron alloy, cobalt amorphous alloy, iron amorphous alloy, oxide magnetic powder (ferrite), carbonyl iron, molybdenum permalloy, pure iron dust The organic binder is a polyester resin, a polyvinyl chloride resin, a polyvinyl butyral resin, a polyurethane resin, a cellulose resin, a nitrile-butadiene rubber, or a styrene-butadiene system. Thermoplastic resins such as rubber or copolymers thereof, It is characterized by using the above-mentioned magnetic core made of thermosetting resin such as poxy resin, phenol resin, amide resin, imide resin, or the like, halide or brominated polymer as organic flame retardant, or a combination thereof. A coil antenna device for a radio timepiece according to claim 1.   The coil antenna device for a radio-controlled timepiece according to claim 2, wherein the soft magnetic powder uses the magnetic core of flat or needle-like powder.   The coil for a radio-controlled timepiece according to claim 2 or 7, wherein the soft magnetic powder uses the magnetic core that is a powder that is insulation-coated with an oxide film, an organic binder, or the like, or a conductive powder. Antenna device.   The magnetic core is provided with a dielectric layer on at least one surface of an insulating soft magnetic layer, the insulating soft magnetic layer includes the soft magnetic powder and the organic binder, and the dielectric layer includes: The coil antenna device for a radio timepiece according to claim 6, wherein the magnetic core containing dielectric powder and the organic binder is used.   The magnetic core has an insulating soft magnetic layer, and the insulating soft magnetic layer uses the magnetic core containing the soft magnetic powder, the dielectric powder, and the organic binder. The coil antenna device for a radio timepiece according to claim 6.   2. The coil antenna device for a radio timepiece according to claim 1, wherein the coil antenna device has flexibility.   The coil antenna device for a radio-controlled timepiece according to claim 1, wherein the magnetic core has a flat plate shape.

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