EP2360704B1 - Antenna coil - Google Patents
Antenna coil Download PDFInfo
- Publication number
- EP2360704B1 EP2360704B1 EP11154180.1A EP11154180A EP2360704B1 EP 2360704 B1 EP2360704 B1 EP 2360704B1 EP 11154180 A EP11154180 A EP 11154180A EP 2360704 B1 EP2360704 B1 EP 2360704B1
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- European Patent Office
- Prior art keywords
- axis
- section
- winding
- sections
- winding frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004804 winding Methods 0.000 claims description 489
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 239000011162 core material Substances 0.000 description 79
- 239000011810 insulating material Substances 0.000 description 14
- 230000035945 sensitivity Effects 0.000 description 6
- 239000000758 substrate Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
- H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
- H01Q1/3241—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems particular used in keyless entry systems
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00944—Details of construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F2003/005—Magnetic cores for receiving several windings with perpendicular axes, e.g. for antennae or inductive power transfer
Definitions
- the present invention relates to an antenna coil in which coils are wound at least in the X-axis and Y-axis directions crossing each other.
- the antenna coil As an example of the antenna coil, a type is known which is mounted in a remote controller for unlocking and locking a keyless entry system used in an automobile or a house. In recent years, it has been demanded to improve the sensitivity of the antenna coil in order to enable the information to be more surely exchanged between the controller and the control unit on the side of the automobile or the house. On the other hand, the demand for miniaturization of the antenna coil has also been increased in order to improve portability for the user.
- FIG. 1 to FIG. 3 show an antenna coil in which a Y-axis winding wire is superposed and wound around the outer periphery of an X-axis winding wire so as to make the axis lines of the windings orthogonal to each other.
- FIG. 4 to FIG. 6 show an antenna coil in which an X-axis winding wire and a Y-axis winding wire are wound around a cross-shaped core.
- FIG. 12 shows an antenna coil in which an X-axis winding wire and a Y-axis winding wire are wound around a cross-shaped core in such an inclined manner that the number of turns of each of the winding wires is increased toward the outer periphery of the cross-shaped core.
- the antenna coil which is disclosed in Japanese Laid-Open Patent Publication No. 2003-92509 , and in which the Y-axis winding wire is superposed and wound around the outer periphery of the X-axis winding wire so as to make the axis lines of the windings orthogonal to each other, has a problem that the tension at the time of winding may be intensively applied between the coil wires so as to damage the insulating coating on the coil surface, and that, when the core wire of the coil wire is exposed, a short circuit is caused in the coil so as to deteriorate the antenna characteristics.
- the height of the antenna coil in the Z-axis direction that is, the thickness dimension of the antenna coil is increased, which becomes an obstacle when the antenna coil as a whole is miniaturized into a flat shape.
- the space between the X-axis and Y-axis winding wires adjacent to each other is increased from the intersection toward the outer side of the cross core, so that the spaces of the corner portions between the X-axis and Y-axis winding wires are useless.
- the X-axis winding wire and the Y-axis winding wire are respectively wound in such an inclined manner that the number of turns of each of the windings is increased toward the outer side of the cross core, the winding work for successively increasing the number of turns is complicated and difficult, and collapse of winding wire may occur.
- An object of the present invention is to provide an antenna coil which is capable of attaining both the improvement of antenna characteristics and the miniaturization of the antenna coil.
- an antenna coil according to the present invention includes a core member having an X-axis leg section and a Y axis leg section which respectively protrude in the X-axis and the Y-axis directions from the intersection of the core member, and an X-axis winding wire and a Y-axis winding wire which are respectively wound around the outer periphery of the X-axis leg section and the Y-axis leg section, and is featured in that at least one of an X-axis winding frame section for the X-axis winding wire, which frame section is provided at the X-axis leg section, and a Y-axis winding frame section for the Y-axis winding wire, which frame section is provided at the Y-axis leg section, includes an intermediate flange section for separating the winding frame section into at least two winding frame sections for different winding shapes.
- the core member can be configured so that the X-axis leg section and the Y-axis leg section are formed into a cross shape in which the X-axis and Y-axis leg sections intersect each other at the midpoint thereof.
- the X-axis leg section has the X-axis winding frame sections on both sides of the midpoint of the X-axis leg section
- the Y-axis leg section has the Y-axis winding frame sections on both sides of the midpoint of the Y-axis leg section
- each of the X-axis winding frame section and the Y-axis winding frame section is provided with the intermediate flange section, and each of the winding flange sections is formed into the plurality of winding frame sections separated from each other by the intermediate flange section.
- the outer winding sections of the X-axis leg section have a larger Y-axis direction width and a smaller Z-axis direction thickness than the inner winding sections of the X-axis leg section, and wherein the outer winding sections of the Y-axis leg section have a larger X-axis direction width and a smaller Z-axis direction thickness than the inner winding sections of the Y-axis leg section.
- the intermediate flange section may be formed into a plate-shaped intermediate flange section made of the core member.
- an outer flange section made of the core member is provided at the outer end of the X-axis leg section and the Y-axis leg section so as to be in parallel with the intermediate flange section.
- the inner winding wire wound around the inner winding frame section provided on the inner side of the intermediate flange section is wound with a smaller number of turns
- the outer winding wire wound around the outer winding frame section provided on the outer side of the intermediate flange section is wound with a larger number of turns.
- the width of the X-axis leg section and the Y-axis leg section is made smaller in the inner winding section corresponding to the inner winding frame section provided on the inner side of the intermediate flange section, and is made larger in the outer winding section corresponding to the outer winding frame section provided on the outer side of the intermediate flange section.
- a Z-axis winding wire is wound around the peripheral portion of the core member in the peripheral direction.
- the winding frame sections separated by the intermediate flange section are configured such that at least either the number of turns of the winding or the cross-sectional area of the core member is different between the winding frame sections.
- FIG. 1 and FIG. 2 showy three-dimensional antenna unit 1A having an antenna coil 10 according to a first embodiment of the present invention.
- the left and right direction in FIG. 1 is the X-axis direction
- the vertical direction in FIG. 1 is the Y-axis direction
- the left and right direction (front and rear direction) in FIG. 2 is the Z-axis direction.
- the antenna coil 10 includes: a cross-shaped core member 2 which has an X-axis leg section 21 protruding in the X-axis direction from an intersection 2s located at the center portion (midpoint) of the core member 2, and a Y-axis leg section 22 protruding in the Y-axis direction from the intersection 2s; four X-axis base members 30 which are made of an insulating material and respectively attached to both side ends of the X-axis leg sections 21 of the core member 2; four Y-axis base members 40 which are made of the insulating material and respectively attached to both side ends of the Y-axis leg sections 22 of the core member 2; X-axis winding frame sections 3 which are formed around the outer periphery of the X-axis leg section 21 by the core member 2 and the X-axis base member 30; Y-axis winding frame sections 4 which are formed around the outer periphery of the Y-axis leg section 22 by the core member 2 and the Y-axi
- a Z-axis winding wire 7 is wound around the peripheral portion of the antenna coil 10 in the peripheral direction, and terminal sections 9 (see FIG. 2 ) are respectively provided at the X-axis base member 30 and the Y-axis base member 40. Further, as required, the outer periphery is covered with a resin molding or housed in a case, so that the three-dimensional antenna unit 1A is formed.
- the core member 2 is formed into the cross shape in such a manner that the X-axis leg section 21 having an 1-shape (rod shape) and the Y-axis leg section 22 (see FIG. 2 ) having the same 1-shape (rod shape) are combined together in the front and rear direction at the intersection 2s located at the midpoint of the leg sections.
- the X-axis leg section 21 and the Y-axis leg section 22 have the same shape, and hence the configuration of the Y-axis leg section 22 will be described with reference to FIG. 2 .
- intersection 22s located at the midpoint of the Y-axis leg section 22 is deviated to the front surface side so as to be formed in a plate shape for connecting the upper and lower Y-axis winding frame sections 4.
- Inner flange sections 22t and 22t extending in the front and rear direction are successively provided on both sides (upper and lower sides in FIG. 2 ) of the intersection 22s.
- a recessed section 22f is formed behind the intersection 22s by the inner flange sections 22t and 22t protruding in the rear direction.
- Inner winding sections 22a and 22a serving as winding shaft portions are successively provided on the outer side of the inner flange sections 22t and 22t.
- the inner winding sections 22a and 22a are formed to have a width (X-axis direction length) slightly smaller than the width of the intersection 22s.
- outer winding sections 22b and 22b are successively provided so that step sections are formed on both sides of each of the outer winding sections 22b and 22b.
- outer flanges 22c and 22c are successively provided so as to have the same X-axis direction width as and a larger Z-axis direction thickness than the outer winding section 22b.
- a recessed section 22d extending in the X-axis direction for winding the Z-axis winding wire 7 is provided.
- the X-axis leg section 21 has the same shape as the shape of the Y-axis leg section 22.
- inner flange sections 21t and 21t On both sides of an intersection 21s located at the midpoint of the X-axis leg section 21, inner flange sections 21t and 21t, inner winding sections 21a and 21a, outer winding sections 21b and 21b, and outer flanges. 21 c and 21 c are successively provided in this order, and a recessed section 21d is provided in each of the outer flanges 21c and 21c.
- the core member 2 is configured in such a way that the X-axis leg section 21, which is inverted front-to-back and rotated by 90 degrees with respect to the Y-axis leg section 22, is combined with the Y-axis leg section 22 by inserting the intersection 21s (see FIG. 2 ) located at the midpoint of the X-axis leg section 21 into the recessed section 22f provided on the rear surface side of the intersection 22s of the Y-axis leg section 22 from the rear surface side of the intersection 22s.
- the X-axis base member 30 having an intermediate flange section 31 is attached to both ends of the X-axis leg section 21 from the rear surface side, the X-axis winding wires 5a and 5b are wound, while after the Y-axis base member 40 having an intermediate flange section 41 is attached to both ends of both ends of the Y-axis leg section 22 from the rear surface side, the Y-axis winding wires 6a and 6b are wound.
- the X-axis base member 30 and the Y-axis base member 40 have approximately the same shape, and hence the configuration of the Y-axis base member 40 will be described with reference to FIG. 1 and FIG. 2 .
- the Y-axis base member 40 has, at the outer side end thereof, a substrate section 42 which is brought into contact with the rear surface of the outer flange 22c of the Y-axis leg section 22. Also, outer frame sections 43 located on both sides of the outer flange 22c of the Y-axis leg section 22 are provided on both X-axis direction sides of the substrate section 42.
- the outer frame section 43 has a recessed section 43a for winding the Z-axis winding wire, which recessed section is formed so as to be connected to the recessed section 22d of the outer flange 22c.
- the side bottom surface of the recessed section 43a is formed into a taper surface 43b which is inclined inward so as to be directed to an adjacent taper surface 33b of the X-axis base member 30.
- the X-axis base member 30 is formed to have a substrate section (not shown), an outer frame section 33, an outer winding frame 34 described below, the intermediate flange section 31, an inner winding frame 35, and an inner flange 36.
- Rod-shaped outer winding frames 44 extending along both sides of the outer winding section 22b of the Y-axis leg section 22 are successively provided on the inner side of the outer frame section 43 of the Y-axis base member 40.
- the intermediate flange section 41 is successively provided on the inner side of the outer winding frame 44.
- a rod-shaped inner winding frames 45 extending along both sides of the inner winding section 22a of the Y-axis leg section 22 is successively provided on the inner side of the intermediate flange section 41.
- an inner flange 46 is successively provided at the inner end portion of the inner winding frame 45.
- the intermediate flange section 41 is a member for separating the inner winding section 22a and the outer winding section 22b of the Y-axis leg section 22, that is, a member for separating the Y-axis winding frame section 4 into an inner winding frame section 4a and an outer winding frame section 4b.
- the intermediate flange section 41 has an opening on the central front surface side thereof, and the inner winding section 22a of the Y-axis leg section 22 is inserted through the opening.
- the inner flange 46 is extended in the front and rear direction along both the side surfaces of the inner flange section 22t of the Y-axis leg section 22, so as to form a winding flange on the inner side of the inner winding frame section 4a.
- the outer winding frame 44 and the inner winding frame 45 are respectively extended in the axial direction of the Y-axis leg section 22 along the side surfaces of the outer winding section 22b and the inner winding section 22a of the Y-axis leg section 22.
- the front and rear surfaces of the outer and inner winding sections 22b and 22a of the Y-axis leg section 22 are opened by not providing the outer winding frame 44 and the inner winding frame 45, so that the Y-axis winding wires 6a and 6b described below are respectively wound around the outer and inner winding sections 22b and 22a.
- the Y-axis base members 40 and 40 are provided respectively on both sides of the Y-axis leg section 22, and the Y-axis winding frame sections 4 and 4 are formed on both sides of the intersection 2s. Further, the intermediate flange sections 41 and 41 are provided, and thereby each of the Y-axis winding frame sections 4 and 4 is formed to be separated into a pair of the inner winding frame sections 4a and 4a and a pair of the outer winding frame sections 4b and 4b.
- the Y-axis winding wires (inner winding wires) 6a and 6a are respectively wound around the inner winding frame sections 4a and 4a respectively formed around the inner winding sections 22a and 22a, on both sides of which the inner winding frames 45 and 45 are located.
- the Y-axis winding wire (outer winding wires) 6b and 6b are respectively wound around the outer winding frame sections 4b and 4b respectively formed around the outer winding sections 22b and 22b, on both sides of which the outer winding frames 44 and 44 are located.
- the inner winding wire 6a is wound around the inner winding frame section 4a which, in the space formed by the intermediate flange section 41 and the inner flange 46 of the Y-axis base member 40, and by the inner flange section 22t, is formed by the outer periphery of the exposed front and rear surfaces of the inner winding section 22a of the Y-axis leg section 22 and the outer periphery of the inner winding frames 45 formed on both sides of the inner winding section 22a.
- the outer winding wire 5b is wound around the outer winding frame section 4b which, in the space formed by the outer flange 43 of the Y-axis base member 40, the outer flange 22c of the Y-axis leg section 22, and the intermediate flange section 41, is formed by the outer periphery of the exposed front and rear surfaces of the outer winding section 22b of the Y-axis leg section 22 and the outer periphery of the outer winding frames 44 formed on both sides of the outer winding section 22b.
- the X-axis base members 30 and 30 are attached respectively on both sides of the X-axis leg section 21, and then the X-axis winding frame sections 3 and 3 are similarly formed on both sides of the intersection 2s.
- the intermediate flange sections 31 and 31 are provided so that inner winding frame sections 3a and 3a and outer winding frame sections 3b and 3b are respectively formed so as to allow the inner winding frame section 3a to be separated from the outer winding frame section 3b.
- the X-axis winding wires 5a and 5b inner winding wire and outer winding wire
- intersection 21s located at the midpoint of the X-axis leg section 21 around which the X-axis winding wires 5a and 5b are wound as described above, and the intersection 22s located at the midpoint of the Y-axis leg section 22 around which the Y-axis winding wires 6a and 6b are wound, are combined with each other in the front and rear direction so that a cross shape is formed so as to allow both the rear surfaces of the X-axis base member 30 and of the Y-axis base member 40 to be located on the same plane.
- the Z-axis winding wire 7 is wound around the recessed sections 21d, 22d, 33a and 43a of the outer flanges 21c, 22c, 33 and 43 formed respectively at the outer periphery of the X-axis leg section 21, the Y-axis leg section 22, the X-axis base member 30, and the Y-axis base member 40. Then, the outer periphery of the Z-axis winding wire 7 is covered with a resin molding or housed in a case as required, so that the three-dimensional antenna unit 1A is formed.
- each of the end portions of the X-axis winding wires 5a and 5b, the Y-axis winding wires 6a and 6b, and the Z-axis winding wire 7 is connected to each of the predetermined terminal sections 9.
- the inner winding wires 5a and 6a and the outer winding wires 5b and 6b are formed so that any of the winding dimensions of the inner winding wire 5a and 6a, which dimensions include the inner peripheral dimension, the outer peripheral dimension, and the winding cross-sectional area, is smaller than any of the winding dimensions of the outer winding wire 5b and 6b.
- the X-axis winding wires 5a and 5b and the Y-axis winding wires 6a and 6b are separated into the inner winding frame sections 3a and 4a and the outer winding frame sections 3b and 4b so that the winding frame shape (inner and outer peripheral dimensions) of the inner winding frame sections 3a and 4a is different from the winding frame shape of the outer winding frame sections 3b and 4b.
- the X-axis winding wire 5a and 5b and the Y-axis winding wire 6a and 6b are arranged by effectively utilizing the inner space, so that the miniaturization of the three-dimensional antenna unit 1A is realized.
- the antenna characteristics is improved by increasing the number of turns of the X-axis winding wire 5a and 5b and the Y-axis winding wire 6a and 6b and further by increasing the core cross-sectional area of the X-axis leg section 21 and the Y-axis leg section 22.
- Second to fourth embodiments shown in FIG. 3A , FIG. 3B to FIG. 5A , and FIG. 5B show typical configuration examples in which the antenna characteristics (sensitivity performance, and the like) of antenna coils 11 to 13 are improved. That is, in order to improve the antenna characteristics, it is effective means to increase the number of turns of the winding or to increase the cross-sectional area of the core, as described above. Accordingly, the second embodiment shown in FIG. 3A and FIG. 3B is an example in which the antenna characteristics are improved by increasing the number of turns of the winding, and the third embodiment shown in FIG. 4A and FIG. 4B is an example in which the antenna characteristics are improved by increasing the core cross-sectional area. Further, the fourth embodiment shown in FIG. 5A and FIG. 5B is an example in which the antenna characteristics are improved by increasing the number of turns of the winding and the core cross-sectional area.
- a core member 2 is formed into a cross shape having an intersection 2s, a rectangular plate-shaped X-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of the intersection 2s, and a rectangular plate-shaped Y-axis leg section 22 protruding in the Y-axis (vertical) direction from both sides of the intersection 2s.
- An X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21 is divided into an inner winding frame section 3a and an outer winding frame section 3b by a plate-shaped intermediate flange section 31 made of an insulating material and provided in an intermediate portion of the X-axis leg section 21, while a Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner winding frame section 4a and an outer winding frame section 4b by a plate-shaped intermediate flange section 41 made of an insulating material and provided in an intermediate portion of the Y-axis winding frame section 4.
- the intermediate flange sections 31 and 41 are provided so as to extend in the Z-axis direction perpendicular to the respective protruding directions of the X-axis leg section 21 and the Y-axis leg section 22. Further, a rectangular-shaped outer flange 23 made of an insulating material is provided to surround the outer end portions of the X-axis leg section 21 and the Y-axis leg section 22 so as to connect the outer end portions with each other.
- X-axis winding wires 5a and 5b are wound around the X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21.
- the inner winding wire 5a and the outer winding wire 5b are respectively wound around the inner winding frame section 3a and the outer winding frame section 3b which are divided from each other by the intermediate flange section 31.
- Y-axis winding wires 6a and 6b are wound around the Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22.
- the inner winding wire 6a and the outer winding wire 6b are respectively wound around the inner winding frame section 4a and the outer winding frame section 4b which are divided from each other by the intermediate flange section 41.
- the inner winding wires 5a and 6a respectively wound around the inner winding frame sections 3a and 4a, each of which is provided between each of the intermediate flange sections 31 and 41 and the intersection 2s of the core member 2 located on the inner side of the intermediate flange sections 31 and 41, are wound with a small number of turns so as not to interfere with each other.
- outer winding wires and 6b respectively wound around the outer winding frame sections 3b and 4b are wound with a large number of turns in correspondence with the large side space and in the range in which the outer winding wires 5b and 6b do not interfere with each other.
- a Z-axis winding wire 7 is provided by being wound around the outer periphery of the outer flange 23 in the peripheral direction, so that the three-dimensional antenna unit 1B is formed.
- the intermediate flange sections 31 and 41 are provided, the number of turns of the outer winding wires 5b and 6b is increased, and thereby the antenna characteristics are improved.
- the Z-axis direction height of the antenna coil 11 tends to be increased as shown in FIG. 3B .
- a core member 2 is formed into a cross shape having an intersection 2s, a rectangular plate-shaped X-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of the intersection 2s, and a rectangular plate-shaped Y-axis leg section 22 protruding in the Y-axis (vertical) direction from both sides of the intersection 2s.
- An X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21 is divided into an inner winding frame section 3a and an outer winding frame section 3b by a plate-shaped intermediate flange section 31 made of an insulating material and provided in an intermediate portion of the X-axis leg section 21, while a Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner winding frame section 4a and an outer winding frame section 4b by a plate-shaped intermediate flange section 41 made of the insulating material and provided in an intermediate portion of the Y-axis winding frame section 4.
- the intermediate flange sections 31 and 41 are provided so as to extend in the Z-axis direction perpendicular to the directions in which the X-axis leg section 21 and the Y-axis leg section 22 are made to protrude respectively.
- an outer flange 23 made of a rectangular-shaped insulating material is provided to surround the outer end portions of the X-axis leg section 21 and the Y-axis leg section 22 so as to connect the outer end portions with each other.
- X-axis winding wires 5a and 5b are wound around the X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21.
- the inner winding wire 5a and the outer winding wire 5b are respectively wound around the inner winding frame section 3a and the outer winding frame section 3b which are divided from each other by the intermediate flange section 31.
- Y-axis winding wires 6a and 6b are wound around the Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22.
- the inner winding wire 6a and the outer winding wire 6b are respectively wound around the inner winding frame section 4a and the outer winding frame section 4b which are divided from each other by the intermediate flange section 41.
- the X-axis leg section 21 and the Y-axis leg section 22 are respectively formed to have a narrow width in the inner winding sections 21a and 22a corresponding to the inner winding frame sections 3a and 4a, and are respectively formed to have a wide width in the outer winding sections 21b and 22b corresponding to the outer winding frame sections 3b and 4b.
- the number of turns (winding thickness) of the inner winding wire 5a and 6a wound around the inner winding sections 21a and 22a is set to be equal to the number of turns of the outer winding wire 5b and 6b wound around the outer winding sections 21b and 22b.
- a Z-axis winding wire 7 is provided by being wound around the outer periphery of the outer flange 23 in the peripheral direction, so that the three-dimensional antenna unit 1C is formed.
- the core cross-sectional area of the outer winding sections 21b and 22b on the outer side of the intermediate flange sections 31 and 41 is increased in the X-axis leg section 21 and the Y-axis leg section 22 of the core member 2, and thereby the antenna characteristics are improved.
- the number of turns of the outer winding wires 5b and 6b is equal to the number of turns of the inner winding wires 5a and 6a, it is possible to make short the Z-axis direction height of the antenna coil 12 as shown in FIG. 4B .
- a core member 2 is formed into a cross shape having an intersection 2s, a plate-shaped X-axis leg section 21 which is formed to protrude in the X-axis (right and left) direction from both sides of the intersection 2s and the thickness of which is changed in the interval on both sides of the intersection 2s, and a plate-shaped Y-axis leg section 22 which is formed to protrude in the Y-axis (vertical) direction from both sides of the intersection 2s and the thickness of which is changed in the interval on both sides of the intersection 2s.
- An X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21 is divided into an inner winding frame section 3a and an outer winding frame section 3b by a plate-shaped intermediate flange section 31 made of an insulating material and provided in an intermediate portion of the X-axis leg section 21, while a Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner winding frame section 4a and an outer winding frame section 4b by a plate-shaped intermediate flange section 41 made of the insulating material and provided in an intermediate portion of the Y-axis winding frame section 4.
- the intermediate flange sections 31 and 41 are provided so as to extend in the Z-axis direction perpendicular to the directions in which the X-axis leg section 21 and the Y-axis leg section 22 are made to protrude respectively.
- an outer flange 23 made of a rectangular-shaped insulating material is provided to surround the outer end portions of the X-axis leg section 21 and the Y-axis leg section 22 so as to connect the outer end portions with each other.
- X-axis winding wires 5a and 5b are wound around the X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21.
- the inner winding wire 5a and the outer winding wire 5b are respectively wound around the inner winding frame section 3a and the outer winding frame section 3b which are divided from each other by the intermediate flange section 31.
- Y-axis winding wires 6a and 6b are wound around the Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22.
- the inner winding wire 6a and the outer winding wire 6b are respectively wound around the inner winding frame section 4a and the outer winding frame section 4b which are divided from each other by the intermediate flange section 41.
- the X-axis leg section 21 and the Y-axis leg section 22 of the core member 2 are respectively formed to have a narrow width in inner winding sections 21 a and 22a corresponding to the inner winding frame sections 3a and 4a, and are respectively formed to have a wide width in outer winding sections 21b and 22b corresponding to the outer winding frame sections 3b and 4b.
- the X-axis leg section 21 and the Y-axis leg section 22 of the core member 2 are respectively formed to have a large thickness in the inner winding sections 21a and 22a and are respectively formed to have a small thickness in the outer winding sections 21b and 22b.
- the inner winding wires 5a and 6a respectively wound around the inner winding frame sections 3a and 4a, each of which is provided between each of the intermediate flange sections 31 and 41 and the intersection 2s of the core member 2 located on the inner side of the intermediate flange sections 31 and 41, are wound with a small number of turns so as not to interfere with each other.
- the intermediate flange sections 31 and 41 are provided, the number of turns of the outer winding wires 5b and 6b, and the core cross-sectional area of the outer winding sections 21b and 22b on the outer side of the intermediate flange sections 31 and 41 are increased, and thereby the antenna characteristics are improved.
- the Z-axis direction height of the antenna coil 13 is lower than the Z-axis direction height of the antenna coil 11 of the second embodiment, the Z-axis direction height of the antenna coil 13 tends to be increased to be higher than the Z-axis direction height of the antenna coil 12 of the third embodiment, as the number of turns of the outer winding wires 5b and 6b is increased.
- each of fifth and sixth embodiments shown in FIG. 6 and FIG. 7 shows an embodiment in which the intermediate flange sections 31 and 41 are formed by the core member 2.
- the fifth and sixth embodiments respectively show two typical configuration examples for improving the antenna characteristics (sensitivity performance, and the like) of antenna coils 14 and 15. That is, in order to improve the antenna characteristics, it is effective means to increase the number of turns of the winding or to increase the cross-sectional area of the core, as described above. Accordingly, the fifth embodiment shown in FIG. 6 is an example in which the antenna characteristics are improved by increasing the number of turns of the winding, and the sixth embodiment shown in FIG. 7 is an example in which the antenna characteristics are improved by increasing the core cross-sectional area.
- a core member 2 is formed into a cross shape having an intersection 2s, a X-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of the intersection 2s, and a Y-axis leg section 22 protruding in the Y-axis (vertical) direction from both sides of the intersection 2s.
- An X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21 is divided into an inner winding frame section 3a and an outer winding frame sections 3b by a plate-shaped intermediate flange section 24 made of the core material and provided in an intermediate portion of the X-axis leg section 21, while a Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner winding frame section 4a and an outer winding frame section 4b by a plate-shaped intermediate flange section 25 made of the core material and provided in an intermediate portion of the Y-axis winding frame section 4.
- the intermediate flange sections 24 and 25 are provided so as to extend in the Z-axis direction perpendicular to the directions in which the X-axis leg section 21 and Y-axis leg section 22 are made to protrude respectively. Further, outer flanges 26 and 27 made of the core material are respectively provided at the outer ends of the X-axis leg section 21 and the Y-axis leg section 22 so as to be in parallel with the intermediate flange sections 24 and 25, respectively.
- X-axis winding wires 5a and 5b are wound around the X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21.
- the inner winding wire 5a and the outer winding wire 5b are respectively wound around the inner winding frame section 3a and the outer winding frame section 3b which are divided from each other by the intermediate flange section 24.
- Y-axis winding wires 6a and 6b are wound around the Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22.
- the inner winding wire 6a and the outer winding wire 6b are respectively wound around the inner winding frame section 4a and the outer winding frame section 4b which are divided from each other by the intermediate flange section 25.
- the inner winding wires 5a and 6a respectively wound around the inner winding frame sections 3a and 4a, each of which is provided between each of the intermediate flange sections 24 and 25 and the intersection 2s of the core member 2 provided on the inner side of the intermediate flange sections 24 and 25, are wound with a small number of turns so as not to interfere with each other.
- the outer winding wires 5b and 6b respectively wound around the outer winding frame sections 3b and 4b, each of which is provided between each of the intermediate flange sections 24 and 25 and each of the outer flanges 26 and 27 respectively provided on the outer side of the intermediate flange sections 24 and 25, are wound with a large number of rums in correspondence with the large side space and in the range in which the outer winding wires 5b and 6b do not interfere with each other.
- the antenna coil 14 is formed.
- the intermediate flange sections 24 and 25 and the outer flanges 26 and 27, which are made of the core material, are provided, so that the base members are unnecessary for the winding frame sections 3 and 4. Further, the antenna characteristics are improved as the number of turns of the outer winding wire 5b and 6b is increased.
- the Z-axis direction height of the antenna coil 14 tends to be increased.
- a core member 2 is formed into a cross shape having an intersection 2s, an X-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of the intersection 2s, and a Y-axis leg section 22 protruding in the Y-axis (vertical) direction from both sides of the intersection 2s.
- An X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21 is divided into an inner winding frame section 3a and an outer winding frame sections 3b by a plate-shaped intermediate flange section 24 made of the core material and provided in an intermediate portion of the X-axis leg section 21, while a Y-axis winding frame sections 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner winding frame section 4a and an outer winding frame section 4b by a plate-shaped intermediate flange section 25 made of the core material and provided in an intermediate portion of the Y-axis winding frame section 4.
- the intermediate flange sections 24 and 25 are provided so as to extend in the Z-axis direction perpendicular to the directions in which the X-axis leg section 21 and Y-axis leg section 22 are made to protrude respectively. Further, outer flanges 26 and 27 made of the core material are respectively provided at the outer ends of the X-axis leg section 21 and the Y-axis leg section 22 so as to be in parallel with the intermediate sections 24 and 25, respectively.
- X-axis winding wires 5a and 5b are wound around the X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21.
- the inner winding wire 5a is wound around the inner winding frame section 3a which is divided by the intermediate flange section 24 so as to be provided between the intermediate flange section 24 and the intersection 2s of the core member 2 provided on the inner side of the intermediate flange section 24, while the outer winding wire 5b is wound around the outer winding frame section 3b which is divided by the intermediate flange section 24 so as to be provided between the intermediate flange section 24 and the outer flange 26.
- Y-axis winding wires 6a and 6b are wound around the Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22.
- the inner winding wire 6a is wound around the inner winding frame section 4a which is divided by the intermediate flange section 25 so as to be provided between the intermediate flange section 25 and the intersection 2s of the core member 2 provided on the inner side of the intermediate flange section 25, while the outer winding wire 6b is wound around the outer winding frame section 4b which is divided by the intermediate flange section 25 so as to be provided between the intermediate flange section 25 and the outer flange 27.
- the width of inner winding sections 21a and 22a corresponding to the inner winding frame sections 3a and 4a is narrowed, and the width of outer winding sections 21b and 22b corresponding to the outer winding frame sections 3b and 4b is increased.
- the number of turns (winding thickness) of the inner winding wires 5a and 6a respectively wound around the inner winding sections 21a and 22a is set to be equal to the number of turns of the outer winding wires 5b and 6b respectively wound around the outer winding sections 21b and 22b, so that the antenna coil 15 is formed.
- the base members are unnecessary for the winding frame sections 3 and 4. Further, in the X-axis leg section 21 and the Y-axis leg section 22 of the core member 2, the antenna characteristics are improved as the cross-sectional area of the outer winding sections 21b and 22b respectively provided on the outer sides of the intermediate flange sections 24 and 25 is increased.
- the sixth embodiment similarly to the third embodiment, since the number of turns of the outer winding wires 5b and 6b is equal to the number of turns of the inner winding wires 5a and 6a, the Z-axis direction height of the antenna coil 15 is made short.
- the core member 2 is formed into the cross shape in which the X-axis leg section 21 and the Y-axis leg section 22 are made to cross at the midpoint thereof.
- seventh and eighth embodiments shown in FIG. 8 and FIG. 9 respectively show embodiments in which the core member 2 is formed into a T-shape.
- the seventh embodiment shown in FIG. 8 is an example in which only the Y-axis winding frame section 4 is divided by the intermediate flange section 41.
- the eighth embodiment shown in FIG. 9 is an example in which the X-axis winding frame section 3 is also divided by the intermediate flange section 31.
- a core member 2 is formed into a T-shape having an intersection 2s, an X-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of the intersection 2s, and a Y-axis leg section 22 protruding in the Y-axis direction (downward) from the intersection 2s.
- Outer flanges 26 and 26 made of the core material are formed at both the side end portions of the X-axis leg sections 21, and X-axis winding wires 5 and 5 are respectively wound around X-axis winding frame sections 3 and 3 which are respectively formed around the outer periphery of the X-axis leg sections 21 and between the outer flange 26 and the side surface of the intersection 2s of the core member 2.
- a Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner winding frame section 4a and an outer winding frame section 4b by the plate-shaped intermediate flange section 41 made of an insulating material and provided in an intermediate portion of the Y-axis winding frame section 4.
- the intermediate flange section 41 is provided so as to extend in the Z-axis direction perpendicular to the protruding direction of the Y-axis leg section 22.
- an outer flange 27 made of the core material is provided at the outer end of the Y-axis leg section 22 so as to be in parallel with the intermediate flange section 41.
- Y-axis winding wires 6a and 6b are wound around the Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22.
- the inner winding wire 6a is wound around the inner winding frame section 4a which is divided by the intermediate flange section 41 so as to be provided between the intermediate flange section 41 and the intersection 2s of the core member 2 provided on the inner side of the intermediate flange section 41
- the outer winding wire 6b is wound around the outer winding frame section 4b which is divided by the intermediate flange section 41 so as to be provided between the intermediate flange section 41 and the outer flange 27.
- the Y-axis leg section 22 of the core member 2 is formed to have a narrow width in an inner winding section 22a corresponding to the inner winding frame sections 4a and is formed to have a wide width in an outer winding section 22b corresponding to the outer winding frame section 4b.
- the number of turns (winding thickness) of the inner winding wire wound around the inner winding section 22a is set to be equal to the number of turns of the outer winding wire of the outer winding section 22b, so that the antenna coil 16 is formed.
- a core member 2 is formed into a T-shape having an intersection 2s, an X-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of the intersection 2s, and a Y-axis leg section 22 protruding in the Y-axis direction (downward) from the intersection 2s.
- An X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21 is divided into an inner winding frame section 3a and an outer winding frame sections 3b by the plate-shaped intermediate flange section 31 made of an insulating material and provided in an intermediate portion of the X-axis leg section 21, while a Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner winding frame section 4a and an outer winding frame section 4b by the plate-shaped intermediate flange section 41 made of the insulating material and provided in an intermediate portion of the Y-axis winding frame section 4.
- the intermediate flange sections 31 and 41 are provided so as to extend in the Z-axis direction perpendicular to the directions in which the X-axis leg section 21 and Y-axis leg section 22 are made to protrude respectively. Further, outer flanges 26 and 27 made of the core material are respectively provided at the outer ends of the X-axis leg section 21 and the Y-axis leg section 22 so as to be in parallel with the intermediate flange sections 31 and 41, respectively.
- X-axis winding wires 5a and 5b are wound around the X-axis winding frame section 3 formed around the outer periphery of the X-axis leg section 21.
- the inner winding wire 5a is wound around the inner winding frame section 3a which is divided by the intermediate flange section 31 so as to be provided between the intermediate flange section 31 and the intersection 2s of the core member 2 provided on the inner side of the intermediate flange section 31, while the outer winding wire 5b is wound around the outer winding frame section 3b which is divided by the intermediate flange section 31 so as to be provided between the intermediate flange section 31 and the outer flange 26.
- the X-axis leg section 21 of the core member 2 is formed to have a narrow width in an inner winding section 21a corresponding to the inner winding frame section 3a and to have a wide width in an outer winding section 21b corresponding to the outer winding frame section 3b.
- the number of turns (winding thickness) of the inner winding wire 5a wound around the inner winding section 21 a is set to be equal to the number of turns of the outer winding wire 5b wound around the outer winding section 21b.
- the inner winding section 21a is formed to be eccentric to the outer winding section 21b.
- the intersection 2s, the inner winding wire 5a, the intermediate flange section 31, the outer winding wire 5b, and the outer flange 26 are configured so that the upper edge portions thereof in FIG. 9 are arranged on the same straight line.
- Y-axis winding wires 6a and 6b are wound around the Y-axis winding frame section 4 formed around the outer periphery of the Y-axis leg section 22.
- the inner winding wire 6a is wound around the inner winding frame section 4a which is divided by the intermediate flange section 41 so as to be provided between the intermediate flange section 41 and the intersection 2s of the core member 2 provided on the inner side of the intermediate flange section 41
- the outer winding wire 6b is wound around the outer winding frame section 4b which is divided by the intermediate flange section 41 so as to be provided between the intermediate flange section 41 and the outer flange 27.
- the Y-axis leg section 22 of the core member 2 is formed to have a narrow width in an inner winding section 22a corresponding to the inner winding frame sections 4a and is formed to have a wide width in an outer winding section 22b corresponding to the outer winding frame section 4b.
- the number of turns (winding thickness) of the inner winding wire 6a wound around the inner winding section 22a is made small, and the number of turns of the outer winding wire 6b wound around the outer winding section 22b is increased in correspondence with the large side space. Thereby, the antenna coil 17 is formed.
- the embodiments of the antenna coils 10 to 17 according to the present invention and the three-dimensional antenna units 1A to 1D provided with the antenna coils are described, but the present invention is not limited to the above described embodiments.
- the embodiments of the present invention may be modified into various other forms.
- the above described embodiments show the examples in which the X-axis winding frame section 3 or the Y-axis winding frame section 4 is divided into the two winding frame sections 3a and 3b or the two winding frame sections 4a and 4b by providing the intermediate flange section.
- the X-axis winding frame section 3 or the Y-axis winding frame section 4 may be divided into more than two winding frame sections.
- winding wires may also be divided and formed so that the winding shapes of the winding wires are made small toward the outer side.
- the inner space of the antenna unit may be effectively used in such a manner that the winding frame section on each side of the midpoint of the leg section is divided into three sections, and that the winding shape of the intermediate section is enlarged and the winding shape of the inner and outer side sections is made small.
- the position, at which the intermediate flange section is provided is not limited to the middle position of the X-axis winding frame section 3 and the Y-axis winding frame section 4, and may be a position deviated to the inner side or the outer side in correspondence with the required antenna characteristics.
- an antenna coil may also be configured in such a manner that the intermediate flange section is formed in a bobbin and the winding wire is wound around the bobbin beforehand, and that the bobbin is then attached to the outer periphery of the X-axis leg section 21 or the Y-axis leg section 22 of the core member 2.
- the antenna coil according to the present invention includes the core member having the X-axis and Y-axis leg sections respectively protruding in the X-axis and Y-axis directions from the intersection of the core member, and the X-axis and Y-axis winding wires respectively wound around the outer periphery of the X-axis and Y-axis leg sections, and is featured in that at least one of the X-axis winding frame section for the X-axis winding wire, which frame section is provided at the X-axis leg section, and the Y-axis winding frame section for the Y-axis winding wire, which frame section is provided at the Y-axis leg section, has the intermediate flange section for separating the winding frame section into at least two winding frame sections for different winding shapes.
- the intermediate flange section is provided, the number of turns of the winding wound around the winding frame section provided at the outer periphery of the X-axis and Y-axis leg sections or the cross sectional area of the core member can be increased without collapse of the winding wires. Thereby, the sensitivity of the antenna can be improved, and the antenna coil can be compactly configured by effectively using the outer space between the X-axis and the Y-axis leg sections.
- the core member is formed into a cross shape in which the X-axis leg section and the Y-axis leg section intersect each other at the midpoint thereof, and particularly when the X-axis leg section and the Y-axis leg section are configured to respectively include, on both sides of the midpoint of thereof, the X-axis and Y-axis winding frame sections respectively having the intermediate flange section so that each of the winding frame sections is separated into a plurality of winding frame sections by the intermediate flange section, the outer space between the X-axis leg section and the Y-axis leg section can be more effectively used, and hence an antenna coil having excellent characteristics can be obtained while securing miniaturization.
- an antenna coil which includes a core member having an X-axis leg section protruding in the X-axis direction from an intersection of the core member and having a Y-axis leg section protruding in the Y-axis direction from the intersection, X-axis winding wires wound around the outer periphery of the X-axis leg section, and Y-axis winding wires wound around the outer periphery of the Y-axis leg section, at least one of an X-axis winding frame section for the X-axis winding wire, the X-axis winding frame section being provided at the X-axis leg section, and a Y-axis winding frame section for the Y-axis winding wire, the Y-axis winding frame section being provided at the Y-axis leg section, has one of intermediate flange sections for respectively separating the X-axis winding frame section and the Y-axis winding frame section into a pair of winding frame sections and
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Description
- The present invention relates to an antenna coil in which coils are wound at least in the X-axis and Y-axis directions crossing each other.
- As an example of the antenna coil, a type is known which is mounted in a remote controller for unlocking and locking a keyless entry system used in an automobile or a house. In recent years, it has been demanded to improve the sensitivity of the antenna coil in order to enable the information to be more surely exchanged between the controller and the control unit on the side of the automobile or the house. On the other hand, the demand for miniaturization of the antenna coil has also been increased in order to improve portability for the user.
- As for this kind of technique, antenna coils described in Japanese Laid-Open Patent Publication No.
2003-92509 WO 2007/116797 are known. In Japanese Laid-Open Patent Publication No.2003-92509 FIG. 1 to FIG. 3 show an antenna coil in which a Y-axis winding wire is superposed and wound around the outer periphery of an X-axis winding wire so as to make the axis lines of the windings orthogonal to each other. Also,FIG. 4 to FIG. 6 show an antenna coil in which an X-axis winding wire and a Y-axis winding wire are wound around a cross-shaped core. - Further, in International Publication No.
WO 2007/116797 , FIG. 12 shows an antenna coil in which an X-axis winding wire and a Y-axis winding wire are wound around a cross-shaped core in such an inclined manner that the number of turns of each of the winding wires is increased toward the outer periphery of the cross-shaped core. - However, the antenna coil, which is disclosed in Japanese Laid-Open Patent Publication No.
2003-92509 - On the other hand, in the antenna coil which is disclosed in Japanese Laid-Open Patent Publication No.
2003-92509 - In order to improve the reception characteristics, such as the sensitivity, of the antenna coil, it is necessary to increase the length of the legs protruding in the X-axis and Y-axis directions of the cross core. However, as the length of the legs is increased, the useless space is increased, which becomes an obstacle to the miniaturization of the whole shape of the antenna coil.
- Further, in the antenna coil which is disclosed in International Publication No.
WO 2007/116797 and in which, around the legs respectively protruding in the X-axis and Y-axis directions of the cross core, the X-axis winding wire and the Y-axis winding wire are respectively wound in such an inclined manner that the number of turns of each of the windings is increased toward the outer side of the cross core, the winding work for successively increasing the number of turns is complicated and difficult, and collapse of winding wire may occur. - The present invention has been made in view of the above described circumstances. An object of the present invention is to provide an antenna coil which is capable of attaining both the improvement of antenna characteristics and the miniaturization of the antenna coil.
- To this end, an antenna coil according to the present invention includes a core member having an X-axis leg section and a Y axis leg section which respectively protrude in the X-axis and the Y-axis directions from the intersection of the core member, and an X-axis winding wire and a Y-axis winding wire which are respectively wound around the outer periphery of the X-axis leg section and the Y-axis leg section, and is featured in that at least one of an X-axis winding frame section for the X-axis winding wire, which frame section is provided at the X-axis leg section, and a Y-axis winding frame section for the Y-axis winding wire, which frame section is provided at the Y-axis leg section, includes an intermediate flange section for separating the winding frame section into at least two winding frame sections for different winding shapes.
- In the present invention, the core member can be configured so that the X-axis leg section and the Y-axis leg section are formed into a cross shape in which the X-axis and Y-axis leg sections intersect each other at the midpoint thereof.
- In this case, it is preferred that the X-axis leg section has the X-axis winding frame sections on both sides of the midpoint of the X-axis leg section, and the Y-axis leg section has the Y-axis winding frame sections on both sides of the midpoint of the Y-axis leg section, and that each of the X-axis winding frame section and the Y-axis winding frame section is provided with the intermediate flange section, and each of the winding flange sections is formed into the plurality of winding frame sections separated from each other by the intermediate flange section.
- Further, it is preferred that the outer winding sections of the X-axis leg section have a larger Y-axis direction width and a smaller Z-axis direction thickness than the inner winding sections of the X-axis leg section, and wherein the outer winding sections of the Y-axis leg section have a larger X-axis direction width and a smaller Z-axis direction thickness than the inner winding sections of the Y-axis leg section.
- In addition, in the antenna in accordance with the present invention, the intermediate flange section may be formed into a plate-shaped intermediate flange section made of the core member.
- Still further, in the antenna coil in accordance with the present invention, an outer flange section made of the core member is provided at the outer end of the X-axis leg section and the Y-axis leg section so as to be in parallel with the intermediate flange section.
- Moreover, the inner winding wire wound around the inner winding frame section provided on the inner side of the intermediate flange section is wound with a smaller number of turns, and the outer winding wire wound around the outer winding frame section provided on the outer side of the intermediate flange section is wound with a larger number of turns.
- Further, the width of the X-axis leg section and the Y-axis leg section is made smaller in the inner winding section corresponding to the inner winding frame section provided on the inner side of the intermediate flange section, and is made larger in the outer winding section corresponding to the outer winding frame section provided on the outer side of the intermediate flange section.
- According to the present invetion, a Z-axis winding wire is wound around the peripheral portion of the core member in the peripheral direction.
- It is preferred that the winding frame sections separated by the intermediate flange section are configured such that at least either the number of turns of the winding or the cross-sectional area of the core member is different between the winding frame sections.
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FIG. 1 is a sectional front view of a three-dimensional antenna unit provided with an antenna coil according to a first embodiment of the present invention, the view being taken along the line V-V inFIG. 2 ; -
FIG. 2 is a sectional side view taken along the line W-W inFIG. 1 ; -
FIG. 3A is a longitudinal sectional front view schematically showing the configuration of a three-dimensional antenna unit having an antenna coil according to a second embodiment of the present invention; -
FIG. 3B is a central sectional plan view ofFIG. 3A ; -
FIG. 4A is a longitudinal sectional front view schematically showing the configuration of a three-dimensional antenna unit having an antenna coil according to a third embodiment of the present invention; -
FIG. 4B is a central sectional plan view ofFIG. 4A ; -
FIG. 5A is a longitudinal sectional front view schematically showing the configuration of a three-dimensional antenna unit having an antenna coil according to a fourth embodiment of the present invention; -
FIG. 5B is a central sectional plan view ofFIG. 5A ; -
FIG. 6 is a front view schematically showing the configuration of an antenna coil according to a fifth embodiment of the present invention; -
FIG. 7 is a front view schematically showing the configuration of an antenna coil according to a sixth embodiment of the present invention; -
FIG. 8 is a partially sectional front view schematically showing the configuration of an antenna coil according to a seventh embodiment of the present invention; and -
FIG. 9 is a partially sectional front view schematically showing the configuration of an antenna coil according to an eighth embodiment of the present invention. - In the following, embodiments of an antenna coil according to the present invention and embodiments of a three-dimensional antenna unit having the antenna coil will be described with reference to the accompanying drawings. Note that, in all the drawings, even when some of the components having the same name have different shapes and configurations in the different embodiments, they are denoted by the same reference numerals or characters, and the explanation thereof is suitably omitted.
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FIG. 1 andFIG. 2 showy three-dimensional antenna unit 1A having anantenna coil 10 according to a first embodiment of the present invention. Note that the left and right direction inFIG. 1 is the X-axis direction, the vertical direction inFIG. 1 is the Y-axis direction, and the left and right direction (front and rear direction) inFIG. 2 is the Z-axis direction. - The
antenna coil 10 includes: across-shaped core member 2 which has anX-axis leg section 21 protruding in the X-axis direction from anintersection 2s located at the center portion (midpoint) of thecore member 2, and a Y-axis leg section 22 protruding in the Y-axis direction from theintersection 2s; fourX-axis base members 30 which are made of an insulating material and respectively attached to both side ends of theX-axis leg sections 21 of thecore member 2; four Y-axis base members 40 which are made of the insulating material and respectively attached to both side ends of the Y-axis leg sections 22 of thecore member 2; X-axiswinding frame sections 3 which are formed around the outer periphery of theX-axis leg section 21 by thecore member 2 and theX-axis base member 30; Y-axiswinding frame sections 4 which are formed around the outer periphery of the Y-axis leg section 22 by thecore member 2 and the Y-axis base member 40; twoX-axis winding wires winding frame section 3; and two Y-axis winding wires winding frame section 4. - Further, a Z-
axis winding wire 7 is wound around the peripheral portion of theantenna coil 10 in the peripheral direction, and terminal sections 9 (seeFIG. 2 ) are respectively provided at theX-axis base member 30 and the Y-axis base member 40. Further, as required, the outer periphery is covered with a resin molding or housed in a case, so that the three-dimensional antenna unit 1A is formed. - Each of the members will be described in detail. First, the
core member 2 is formed into the cross shape in such a manner that theX-axis leg section 21 having an 1-shape (rod shape) and the Y-axis leg section 22 (seeFIG. 2 ) having the same 1-shape (rod shape) are combined together in the front and rear direction at theintersection 2s located at the midpoint of the leg sections. TheX-axis leg section 21 and the Y-axis leg section 22 have the same shape, and hence the configuration of the Y-axis leg section 22 will be described with reference toFIG. 2 . - An
intersection 22s located at the midpoint of the Y-axis leg section 22 is deviated to the front surface side so as to be formed in a plate shape for connecting the upper and lower Y-axis windingframe sections 4.Inner flange sections FIG. 2 ) of theintersection 22s. A recessedsection 22f is formed behind theintersection 22s by theinner flange sections - Inner winding
sections inner flange sections sections intersection 22s. Further, on the outer side of the inner windingsections sections section 22a, are successively provided so that step sections are formed on both sides of each of the outer windingsections sections outer flanges section 22b. In the outer end surface of each of theouter flanges section 22d extending in the X-axis direction for winding the Z-axis winding wire 7 is provided. - The
X-axis leg section 21 has the same shape as the shape of the Y-axis leg section 22. On both sides of anintersection 21s located at the midpoint of theX-axis leg section 21,inner flange sections sections sections section 21d is provided in each of theouter flanges - In the assembled state, the
core member 2 is configured in such a way that theX-axis leg section 21, which is inverted front-to-back and rotated by 90 degrees with respect to the Y-axis leg section 22, is combined with the Y-axis leg section 22 by inserting theintersection 21s (seeFIG. 2 ) located at the midpoint of theX-axis leg section 21 into the recessedsection 22f provided on the rear surface side of theintersection 22s of the Y-axis leg section 22 from the rear surface side of theintersection 22s. - After the
X-axis base member 30 having anintermediate flange section 31 is attached to both ends of theX-axis leg section 21 from the rear surface side, theX-axis winding wires axis base member 40 having anintermediate flange section 41 is attached to both ends of both ends of the Y-axis leg section 22 from the rear surface side, the Y-axis winding wires X-axis base member 30 and the Y-axis base member 40 have approximately the same shape, and hence the configuration of the Y-axis base member 40 will be described with reference toFIG. 1 andFIG. 2 . - The Y-
axis base member 40 has, at the outer side end thereof, asubstrate section 42 which is brought into contact with the rear surface of theouter flange 22c of the Y-axis leg section 22. Also,outer frame sections 43 located on both sides of theouter flange 22c of the Y-axis leg section 22 are provided on both X-axis direction sides of thesubstrate section 42. Theouter frame section 43 has a recessedsection 43a for winding the Z-axis winding wire, which recessed section is formed so as to be connected to the recessedsection 22d of theouter flange 22c. The side bottom surface of the recessedsection 43a is formed into ataper surface 43b which is inclined inward so as to be directed to anadjacent taper surface 33b of theX-axis base member 30. Similarly to the Y-axis base member 40, theX-axis base member 30 is formed to have a substrate section (not shown), anouter frame section 33, an outer windingframe 34 described below, theintermediate flange section 31, an inner windingframe 35, and aninner flange 36. - Rod-shaped outer winding
frames 44 extending along both sides of the outer windingsection 22b of the Y-axis leg section 22 are successively provided on the inner side of theouter frame section 43 of the Y-axis base member 40. Theintermediate flange section 41 is successively provided on the inner side of the outer windingframe 44. A rod-shaped inner windingframes 45 extending along both sides of the inner windingsection 22a of the Y-axis leg section 22 is successively provided on the inner side of theintermediate flange section 41. Further, aninner flange 46 is successively provided at the inner end portion of the inner windingframe 45. - The
intermediate flange section 41 is a member for separating the inner windingsection 22a and the outer windingsection 22b of the Y-axis leg section 22, that is, a member for separating the Y-axis windingframe section 4 into an inner windingframe section 4a and an outer windingframe section 4b. Theintermediate flange section 41 has an opening on the central front surface side thereof, and the inner windingsection 22a of the Y-axis leg section 22 is inserted through the opening. Further, theinner flange 46 is extended in the front and rear direction along both the side surfaces of theinner flange section 22t of the Y-axis leg section 22, so as to form a winding flange on the inner side of the inner windingframe section 4a. - As shown in
FIG. 1 , the outer windingframe 44 and the inner windingframe 45 are respectively extended in the axial direction of the Y-axis leg section 22 along the side surfaces of the outer windingsection 22b and the inner windingsection 22a of the Y-axis leg section 22. The front and rear surfaces of the outer and inner windingsections axis leg section 22 are opened by not providing the outer windingframe 44 and the inner windingframe 45, so that the Y-axis winding wires sections - In this way, the Y-
axis base members axis leg section 22, and the Y-axis windingframe sections intersection 2s. Further, theintermediate flange sections frame sections frame sections frame sections frame sections sections frames frame sections sections frames - The inner winding
wire 6a is wound around the inner windingframe section 4a which, in the space formed by theintermediate flange section 41 and theinner flange 46 of the Y-axis base member 40, and by theinner flange section 22t, is formed by the outer periphery of the exposed front and rear surfaces of the inner windingsection 22a of the Y-axis leg section 22 and the outer periphery of the inner windingframes 45 formed on both sides of the inner windingsection 22a. Similarly, the outer windingwire 5b is wound around the outer windingframe section 4b which, in the space formed by theouter flange 43 of the Y-axis base member 40, theouter flange 22c of the Y-axis leg section 22, and theintermediate flange section 41, is formed by the outer periphery of the exposed front and rear surfaces of the outer windingsection 22b of the Y-axis leg section 22 and the outer periphery of the outer windingframes 44 formed on both sides of the outer windingsection 22b. - Similarly to the Y-
axis leg section 22, theX-axis base members X-axis leg section 21, and then the X-axis windingframe sections intersection 2s. Theintermediate flange sections frame sections frame sections frame section 3a to be separated from the outer windingframe section 3b. Then, theX-axis winding wires frame sections 3a and the outer windingframe sections 3b, respectively. - The
intersection 21s located at the midpoint of theX-axis leg section 21 around which theX-axis winding wires intersection 22s located at the midpoint of the Y-axis leg section 22 around which the Y-axis winding wires X-axis base member 30 and of the Y-axis base member 40 to be located on the same plane. Thereafter, the Z-axis winding wire 7 is wound around the recessedsections outer flanges X-axis leg section 21, the Y-axis leg section 22, theX-axis base member 30, and the Y-axis base member 40. Then, the outer periphery of the Z-axis winding wire 7 is covered with a resin molding or housed in a case as required, so that the three-dimensional antenna unit 1A is formed. - Note that each of the end portions of the
X-axis winding wires axis winding wires axis winding wire 7 is connected to each of the predeterminedterminal sections 9. - In the
X-axis winding wires axis winding wires wires wires wire wire intermediate flange sections X-axis winding wires axis winding wires frame sections frame sections frame sections frame sections X-axis winding wire axis winding wire dimensional antenna unit 1A is realized. - According to the present embodiment, the antenna characteristics (sensitivity performance, and the like) is improved by increasing the number of turns of the
X-axis winding wire axis winding wire X-axis leg section 21 and the Y-axis leg section 22. - Second to fourth embodiments shown in
FIG. 3A ,FIG. 3B to FIG. 5A , andFIG. 5B show typical configuration examples in which the antenna characteristics (sensitivity performance, and the like) of antenna coils 11 to 13 are improved. That is, in order to improve the antenna characteristics, it is effective means to increase the number of turns of the winding or to increase the cross-sectional area of the core, as described above. Accordingly, the second embodiment shown inFIG. 3A and FIG. 3B is an example in which the antenna characteristics are improved by increasing the number of turns of the winding, and the third embodiment shown inFIG. 4A and FIG. 4B is an example in which the antenna characteristics are improved by increasing the core cross-sectional area. Further, the fourth embodiment shown inFIG. 5A and FIG. 5B is an example in which the antenna characteristics are improved by increasing the number of turns of the winding and the core cross-sectional area. - First, in
FIG. 3A and FIG. 3B showing a three-dimensional antenna unit 1B of the second embodiment, acore member 2 is formed into a cross shape having anintersection 2s, a rectangular plate-shapedX-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of theintersection 2s, and a rectangular plate-shaped Y-axis leg section 22 protruding in the Y-axis (vertical) direction from both sides of theintersection 2s. - An X-axis winding
frame section 3 formed around the outer periphery of theX-axis leg section 21 is divided into an inner windingframe section 3a and an outer windingframe section 3b by a plate-shapedintermediate flange section 31 made of an insulating material and provided in an intermediate portion of theX-axis leg section 21, while a Y-axis windingframe section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner windingframe section 4a and an outer windingframe section 4b by a plate-shapedintermediate flange section 41 made of an insulating material and provided in an intermediate portion of the Y-axis windingframe section 4. Theintermediate flange sections X-axis leg section 21 and the Y-axis leg section 22. Further, a rectangular-shapedouter flange 23 made of an insulating material is provided to surround the outer end portions of theX-axis leg section 21 and the Y-axis leg section 22 so as to connect the outer end portions with each other. -
X-axis winding wires frame section 3 formed around the outer periphery of theX-axis leg section 21. The inner windingwire 5a and the outer windingwire 5b are respectively wound around the inner windingframe section 3a and the outer windingframe section 3b which are divided from each other by theintermediate flange section 31. Further, Y-axis winding wires frame section 4 formed around the outer periphery of the Y-axis leg section 22. The inner windingwire 6a and the outer windingwire 6b are respectively wound around the inner windingframe section 4a and the outer windingframe section 4b which are divided from each other by theintermediate flange section 41. - Further, in the
X-axis winding wires axis winding wires wires frame sections intermediate flange sections intersection 2s of thecore member 2 located on the inner side of theintermediate flange sections frame sections intermediate flange sections outer flange 23 located on the outer side of theintermediate flange sections wires axis winding wire 7 is provided by being wound around the outer periphery of theouter flange 23 in the peripheral direction, so that the three-dimensional antenna unit 1B is formed. - Thus, since the
intermediate flange sections wires wires antenna coil 11 tends to be increased as shown inFIG. 3B . - Next, in
FIG. 4A and FIG. 4B showing a three-dimensional antenna unit 1C of the third embodiment, acore member 2 is formed into a cross shape having anintersection 2s, a rectangular plate-shapedX-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of theintersection 2s, and a rectangular plate-shaped Y-axis leg section 22 protruding in the Y-axis (vertical) direction from both sides of theintersection 2s. - An X-axis winding
frame section 3 formed around the outer periphery of theX-axis leg section 21 is divided into an inner windingframe section 3a and an outer windingframe section 3b by a plate-shapedintermediate flange section 31 made of an insulating material and provided in an intermediate portion of theX-axis leg section 21, while a Y-axis windingframe section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner windingframe section 4a and an outer windingframe section 4b by a plate-shapedintermediate flange section 41 made of the insulating material and provided in an intermediate portion of the Y-axis windingframe section 4. Theintermediate flange sections X-axis leg section 21 and the Y-axis leg section 22 are made to protrude respectively. Further, anouter flange 23 made of a rectangular-shaped insulating material is provided to surround the outer end portions of theX-axis leg section 21 and the Y-axis leg section 22 so as to connect the outer end portions with each other. -
X-axis winding wires frame section 3 formed around the outer periphery of theX-axis leg section 21. The inner windingwire 5a and the outer windingwire 5b are respectively wound around the inner windingframe section 3a and the outer windingframe section 3b which are divided from each other by theintermediate flange section 31. Further, Y-axis winding wires frame section 4 formed around the outer periphery of the Y-axis leg section 22. The inner windingwire 6a and the outer windingwire 6b are respectively wound around the inner windingframe section 4a and the outer windingframe section 4b which are divided from each other by theintermediate flange section 41. - In this case, in the X-axis winding
frame section 3 and the Y-axis windingframe section 4, in the range in which theX-axis leg section 21 and the Y-axis leg section 22 of thecore member 2 do not interfere with each other, theX-axis leg section 21 and the Y-axis leg section 22 are respectively formed to have a narrow width in the inner windingsections frame sections sections frame sections wire sections wire sections axis winding wire 7 is provided by being wound around the outer periphery of theouter flange 23 in the peripheral direction, so that the three-dimensional antenna unit 1C is formed. - Thus, since the
intermediate flange sections sections intermediate flange sections X-axis leg section 21 and the Y-axis leg section 22 of thecore member 2, and thereby the antenna characteristics are improved. In the third embodiment, since the number of turns of the outer windingwires wires antenna coil 12 as shown inFIG. 4B . - Next, in
FIG. 5A and FIG. 5B showing a three-dimensional antenna unit 1D of the fourth embodiment, acore member 2 is formed into a cross shape having anintersection 2s, a plate-shapedX-axis leg section 21 which is formed to protrude in the X-axis (right and left) direction from both sides of theintersection 2s and the thickness of which is changed in the interval on both sides of theintersection 2s, and a plate-shaped Y-axis leg section 22 which is formed to protrude in the Y-axis (vertical) direction from both sides of theintersection 2s and the thickness of which is changed in the interval on both sides of theintersection 2s. - An X-axis winding
frame section 3 formed around the outer periphery of theX-axis leg section 21 is divided into an inner windingframe section 3a and an outer windingframe section 3b by a plate-shapedintermediate flange section 31 made of an insulating material and provided in an intermediate portion of theX-axis leg section 21, while a Y-axis windingframe section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner windingframe section 4a and an outer windingframe section 4b by a plate-shapedintermediate flange section 41 made of the insulating material and provided in an intermediate portion of the Y-axis windingframe section 4. Theintermediate flange sections X-axis leg section 21 and the Y-axis leg section 22 are made to protrude respectively. Further, anouter flange 23 made of a rectangular-shaped insulating material is provided to surround the outer end portions of theX-axis leg section 21 and the Y-axis leg section 22 so as to connect the outer end portions with each other. -
X-axis winding wires frame section 3 formed around the outer periphery of theX-axis leg section 21. The inner windingwire 5a and the outer windingwire 5b are respectively wound around the inner windingframe section 3a and the outer windingframe section 3b which are divided from each other by theintermediate flange section 31. Further, Y-axis winding wires frame section 4 formed around the outer periphery of the Y-axis leg section 22. The inner windingwire 6a and the outer windingwire 6b are respectively wound around the inner windingframe section 4a and the outer windingframe section 4b which are divided from each other by theintermediate flange section 41. - In this case, in the X-axis winding
frame section 3 and the Y-axis windingframe section 4, theX-axis leg section 21 and the Y-axis leg section 22 of thecore member 2 are respectively formed to have a narrow width in inner windingsections frame sections sections frame sections X-axis leg section 21 and the Y-axis leg section 22 of thecore member 2 are respectively formed to have a large thickness in the inner windingsections sections X-axis winding wires axis winding wires wires frame sections intermediate flange sections intersection 2s of thecore member 2 located on the inner side of theintermediate flange sections wires frame sections intermediate flange sections outer flange 23 provided on the outer side of theintermediate flange sections wires axis winding wire 7 is provided by being wound around the outer periphery of theouter flange 23 in the peripheral direction, so that the three-dimensional antenna unit 1D is formed. - Thus, since the
intermediate flange sections wires sections intermediate flange sections FIG. 5B , although the Z-axis direction height of theantenna coil 13 is lower than the Z-axis direction height of theantenna coil 11 of the second embodiment, the Z-axis direction height of theantenna coil 13 tends to be increased to be higher than the Z-axis direction height of theantenna coil 12 of the third embodiment, as the number of turns of the outer windingwires - The above described embodiments show configurations in which the
intermediate flange sections frame sections core member 2. However, each of fifth and sixth embodiments shown inFIG. 6 and FIG. 7 shows an embodiment in which theintermediate flange sections core member 2. Further, the fifth and sixth embodiments respectively show two typical configuration examples for improving the antenna characteristics (sensitivity performance, and the like) of antenna coils 14 and 15. That is, in order to improve the antenna characteristics, it is effective means to increase the number of turns of the winding or to increase the cross-sectional area of the core, as described above. Accordingly, the fifth embodiment shown inFIG. 6 is an example in which the antenna characteristics are improved by increasing the number of turns of the winding, and the sixth embodiment shown inFIG. 7 is an example in which the antenna characteristics are improved by increasing the core cross-sectional area. - First, in
FIG. 6 showing theantenna coil 14 of the fifth embodiment, acore member 2 is formed into a cross shape having anintersection 2s, aX-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of theintersection 2s, and a Y-axis leg section 22 protruding in the Y-axis (vertical) direction from both sides of theintersection 2s. - An X-axis winding
frame section 3 formed around the outer periphery of theX-axis leg section 21 is divided into an inner windingframe section 3a and an outer windingframe sections 3b by a plate-shapedintermediate flange section 24 made of the core material and provided in an intermediate portion of theX-axis leg section 21, while a Y-axis windingframe section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner windingframe section 4a and an outer windingframe section 4b by a plate-shapedintermediate flange section 25 made of the core material and provided in an intermediate portion of the Y-axis windingframe section 4. Theintermediate flange sections X-axis leg section 21 and Y-axis leg section 22 are made to protrude respectively. Further,outer flanges X-axis leg section 21 and the Y-axis leg section 22 so as to be in parallel with theintermediate flange sections -
X-axis winding wires frame section 3 formed around the outer periphery of theX-axis leg section 21. The inner windingwire 5a and the outer windingwire 5b are respectively wound around the inner windingframe section 3a and the outer windingframe section 3b which are divided from each other by theintermediate flange section 24. Further, Y-axis winding wires frame section 4 formed around the outer periphery of the Y-axis leg section 22. The inner windingwire 6a and the outer windingwire 6b are respectively wound around the inner windingframe section 4a and the outer windingframe section 4b which are divided from each other by theintermediate flange section 25. - Further, in the
X-axis winding wires axis winding wires wires frame sections intermediate flange sections intersection 2s of thecore member 2 provided on the inner side of theintermediate flange sections wires frame sections intermediate flange sections outer flanges intermediate flange sections wires antenna coil 14 is formed. - In the present embodiment, the
intermediate flange sections outer flanges frame sections wire wires antenna coil 14 tends to be increased. - Next, in
FIG. 7 showing theantenna coil 15 of the sixth embodiment, acore member 2 is formed into a cross shape having anintersection 2s, anX-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of theintersection 2s, and a Y-axis leg section 22 protruding in the Y-axis (vertical) direction from both sides of theintersection 2s. - An X-axis winding
frame section 3 formed around the outer periphery of theX-axis leg section 21 is divided into an inner windingframe section 3a and an outer windingframe sections 3b by a plate-shapedintermediate flange section 24 made of the core material and provided in an intermediate portion of theX-axis leg section 21, while a Y-axis windingframe sections 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner windingframe section 4a and an outer windingframe section 4b by a plate-shapedintermediate flange section 25 made of the core material and provided in an intermediate portion of the Y-axis windingframe section 4. Theintermediate flange sections X-axis leg section 21 and Y-axis leg section 22 are made to protrude respectively. Further,outer flanges X-axis leg section 21 and the Y-axis leg section 22 so as to be in parallel with theintermediate sections -
X-axis winding wires frame section 3 formed around the outer periphery of theX-axis leg section 21. The inner windingwire 5a is wound around the inner windingframe section 3a which is divided by theintermediate flange section 24 so as to be provided between theintermediate flange section 24 and theintersection 2s of thecore member 2 provided on the inner side of theintermediate flange section 24, while the outer windingwire 5b is wound around the outer windingframe section 3b which is divided by theintermediate flange section 24 so as to be provided between theintermediate flange section 24 and theouter flange 26. Further, Y-axis winding wires frame section 4 formed around the outer periphery of the Y-axis leg section 22. Similarly, the inner windingwire 6a is wound around the inner windingframe section 4a which is divided by theintermediate flange section 25 so as to be provided between theintermediate flange section 25 and theintersection 2s of thecore member 2 provided on the inner side of theintermediate flange section 25, while the outer windingwire 6b is wound around the outer windingframe section 4b which is divided by theintermediate flange section 25 so as to be provided between theintermediate flange section 25 and theouter flange 27. - In this case, in the X-axis winding
frame section 3 and the Y-axis windingframe section 4, in the range in which theX-axis leg section 21 and the Y-axis leg section 22 of thecore member 2 do not interfere with each other, the width of inner windingsections frame sections sections frame sections wires sections wires sections antenna coil 15 is formed. - In the present embodiment, since the
intermediate flange sections outer flanges frame sections X-axis leg section 21 and the Y-axis leg section 22 of thecore member 2, the antenna characteristics are improved as the cross-sectional area of the outer windingsections intermediate flange sections wires wires antenna coil 15 is made short. - In the above described embodiments, the
core member 2 is formed into the cross shape in which theX-axis leg section 21 and the Y-axis leg section 22 are made to cross at the midpoint thereof. However, seventh and eighth embodiments shown inFIG. 8 and FIG. 9 respectively show embodiments in which thecore member 2 is formed into a T-shape. Further, the seventh embodiment shown inFIG. 8 is an example in which only the Y-axis windingframe section 4 is divided by theintermediate flange section 41. The eighth embodiment shown inFIG. 9 is an example in which the X-axis windingframe section 3 is also divided by theintermediate flange section 31. - First, in
FIG. 8 showing anantenna coil 16 of the seventh embodiment, acore member 2 is formed into a T-shape having anintersection 2s, anX-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of theintersection 2s, and a Y-axis leg section 22 protruding in the Y-axis direction (downward) from theintersection 2s. -
Outer flanges X-axis leg sections 21, andX-axis winding wires frame sections X-axis leg sections 21 and between theouter flange 26 and the side surface of theintersection 2s of thecore member 2. - Further, a Y-axis winding
frame section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner windingframe section 4a and an outer windingframe section 4b by the plate-shapedintermediate flange section 41 made of an insulating material and provided in an intermediate portion of the Y-axis windingframe section 4. Theintermediate flange section 41 is provided so as to extend in the Z-axis direction perpendicular to the protruding direction of the Y-axis leg section 22. Further, anouter flange 27 made of the core material is provided at the outer end of the Y-axis leg section 22 so as to be in parallel with theintermediate flange section 41. - Y-
axis winding wires frame section 4 formed around the outer periphery of the Y-axis leg section 22. The inner windingwire 6a is wound around the inner windingframe section 4a which is divided by theintermediate flange section 41 so as to be provided between theintermediate flange section 41 and theintersection 2s of thecore member 2 provided on the inner side of theintermediate flange section 41, while the outer windingwire 6b is wound around the outer windingframe section 4b which is divided by theintermediate flange section 41 so as to be provided between theintermediate flange section 41 and theouter flange 27. - In this case, in the Y-axis winding
frame section 4, the Y-axis leg section 22 of thecore member 2 is formed to have a narrow width in an inner windingsection 22a corresponding to the inner windingframe sections 4a and is formed to have a wide width in an outer windingsection 22b corresponding to the outer windingframe section 4b. Further, the number of turns (winding thickness) of the inner winding wire wound around the inner windingsection 22a is set to be equal to the number of turns of the outer winding wire of the outer windingsection 22b, so that theantenna coil 16 is formed. - Next, in
FIG. 9 showing anantenna coil 17 of the eighth embodiment, acore member 2 is formed into a T-shape having anintersection 2s, anX-axis leg section 21 protruding in the X-axis (right and left) direction from both sides of theintersection 2s, and a Y-axis leg section 22 protruding in the Y-axis direction (downward) from theintersection 2s. - An X-axis winding
frame section 3 formed around the outer periphery of theX-axis leg section 21 is divided into an inner windingframe section 3a and an outer windingframe sections 3b by the plate-shapedintermediate flange section 31 made of an insulating material and provided in an intermediate portion of theX-axis leg section 21, while a Y-axis windingframe section 4 formed around the outer periphery of the Y-axis leg section 22 is divided into an inner windingframe section 4a and an outer windingframe section 4b by the plate-shapedintermediate flange section 41 made of the insulating material and provided in an intermediate portion of the Y-axis windingframe section 4. Theintermediate flange sections X-axis leg section 21 and Y-axis leg section 22 are made to protrude respectively. Further,outer flanges X-axis leg section 21 and the Y-axis leg section 22 so as to be in parallel with theintermediate flange sections -
X-axis winding wires frame section 3 formed around the outer periphery of theX-axis leg section 21. The inner windingwire 5a is wound around the inner windingframe section 3a which is divided by theintermediate flange section 31 so as to be provided between theintermediate flange section 31 and theintersection 2s of thecore member 2 provided on the inner side of theintermediate flange section 31, while the outer windingwire 5b is wound around the outer windingframe section 3b which is divided by theintermediate flange section 31 so as to be provided between theintermediate flange section 31 and theouter flange 26. In this case, in the X-axis windingframe section 3, theX-axis leg section 21 of thecore member 2 is formed to have a narrow width in an inner windingsection 21a corresponding to the inner windingframe section 3a and to have a wide width in an outer windingsection 21b corresponding to the outer windingframe section 3b. Further, the number of turns (winding thickness) of the inner windingwire 5a wound around the inner windingsection 21 a is set to be equal to the number of turns of the outer windingwire 5b wound around the outer windingsection 21b. Further, the inner windingsection 21a is formed to be eccentric to the outer windingsection 21b. Theintersection 2s, the inner windingwire 5a, theintermediate flange section 31, the outer windingwire 5b, and theouter flange 26 are configured so that the upper edge portions thereof inFIG. 9 are arranged on the same straight line. - Further, Y-
axis winding wires frame section 4 formed around the outer periphery of the Y-axis leg section 22. Similarly, the inner windingwire 6a is wound around the inner windingframe section 4a which is divided by theintermediate flange section 41 so as to be provided between theintermediate flange section 41 and theintersection 2s of thecore member 2 provided on the inner side of theintermediate flange section 41, and the outer windingwire 6b is wound around the outer windingframe section 4b which is divided by theintermediate flange section 41 so as to be provided between theintermediate flange section 41 and theouter flange 27. In this case, in the Y-axis windingframe section 4, the Y-axis leg section 22 of thecore member 2 is formed to have a narrow width in an inner windingsection 22a corresponding to the inner windingframe sections 4a and is formed to have a wide width in an outer windingsection 22b corresponding to the outer windingframe section 4b. Further, in the Y-axis winding wires wire 6a wound around the inner windingsection 22a is made small, and the number of turns of the outer windingwire 6b wound around the outer windingsection 22b is increased in correspondence with the large side space. Thereby, theantenna coil 17 is formed. - As described above, the embodiments of the antenna coils 10 to 17 according to the present invention and the three-
dimensional antenna units 1A to 1D provided with the antenna coils are described, but the present invention is not limited to the above described embodiments. The embodiments of the present invention may be modified into various other forms. - For example, the above described embodiments show the examples in which the X-axis winding
frame section 3 or the Y-axis windingframe section 4 is divided into the two windingframe sections frame sections frame section 3 or the Y-axis windingframe section 4 may be divided into more than two winding frame sections. - Further, a division example in which the.winding shapes of the
X-axis winding wire axis winding wire X-axis leg section 21 and a Y-axis leg section 22 are provided so as to extend toward the corner portions of the rectangular shape so that the side space of each of the leg sections is narrowed at the outer peripheral portion, the inner space of the antenna unit may be effectively used in such a manner that the winding frame section on each side of the midpoint of the leg section is divided into three sections, and that the winding shape of the intermediate section is enlarged and the winding shape of the inner and outer side sections is made small. - Further, the position, at which the intermediate flange section is provided, is not limited to the middle position of the X-axis winding
frame section 3 and the Y-axis windingframe section 4, and may be a position deviated to the inner side or the outer side in correspondence with the required antenna characteristics. - Further, an antenna coil may also be configured in such a manner that the intermediate flange section is formed in a bobbin and the winding wire is wound around the bobbin beforehand, and that the bobbin is then attached to the outer periphery of the
X-axis leg section 21 or the Y-axis leg section 22 of thecore member 2. - The antenna coil according to the present invention includes the core member having the X-axis and Y-axis leg sections respectively protruding in the X-axis and Y-axis directions from the intersection of the core member, and the X-axis and Y-axis winding wires respectively wound around the outer periphery of the X-axis and Y-axis leg sections, and is featured in that at least one of the X-axis winding frame section for the X-axis winding wire, which frame section is provided at the X-axis leg section, and the Y-axis winding frame section for the Y-axis winding wire, which frame section is provided at the Y-axis leg section, has the intermediate flange section for separating the winding frame section into at least two winding frame sections for different winding shapes.
- Therefore, since the intermediate flange section is provided, the number of turns of the winding wound around the winding frame section provided at the outer periphery of the X-axis and Y-axis leg sections or the cross sectional area of the core member can be increased without collapse of the winding wires. Thereby, the sensitivity of the antenna can be improved, and the antenna coil can be compactly configured by effectively using the outer space between the X-axis and the Y-axis leg sections.
- Further, when the core member is formed into a cross shape in which the X-axis leg section and the Y-axis leg section intersect each other at the midpoint thereof, and particularly when the X-axis leg section and the Y-axis leg section are configured to respectively include, on both sides of the midpoint of thereof, the X-axis and Y-axis winding frame sections respectively having the intermediate flange section so that each of the winding frame sections is separated into a plurality of winding frame sections by the intermediate flange section, the outer space between the X-axis leg section and the Y-axis leg section can be more effectively used, and hence an antenna coil having excellent characteristics can be obtained while securing miniaturization.
- In an antenna coil which includes a core member having an X-axis leg section protruding in the X-axis direction from an intersection of the core member and having a Y-axis leg section protruding in the Y-axis direction from the intersection, X-axis winding wires wound around the outer periphery of the X-axis leg section, and Y-axis winding wires wound around the outer periphery of the Y-axis leg section, at least one of an X-axis winding frame section for the X-axis winding wire, the X-axis winding frame section being provided at the X-axis leg section, and a Y-axis winding frame section for the Y-axis winding wire, the Y-axis winding frame section being provided at the Y-axis leg section, has one of intermediate flange sections for respectively separating the X-axis winding frame section and the Y-axis winding frame section into a pair of winding frame sections and a pair of winding frame sections, the winding frame sections of each of the pairs corresponding to different winding shapes.
Claims (9)
- An antenna coil (10) including a core member (2) having an X-axis leg section (21) protruding in the X-axis direction from an intersection (2s) of the core member (2) and having a Y-axis leg section (22) protruding in the Y-axis direction from the intersection (2s), an X-axis winding wire (5a, 5b) wound around the outer periphery of the X-axis leg section (21), and a Y-axis winding wire (6a, 6b) wound around the outer periphery of the Y-axis leg section (22), and
wherein a Z-axis winding wire (7) is wound around the peripheral portion of core member (2) in the peripheral direction,
characterized in that an X-axis winding frame section (3) for the X-axis winding wire (5a, 5b), the X-axis winding frame section (3) being provided at the X-axis leg section (21), and a Y-axis winding frame section (4) for the Y-axis winding wire (6a, 6b), the Y-axis winding frame section (4) being provided at the Y-axis leg section (22), each comprises an intermediate flange section (31, 41) for separating the winding frame sections (3, 4) into inner and outer winding frame sections (3a, 3b, 4a, 4b) for different winding shapes,
the X-axis leg section (21) and the Y-axis-leg section (22) each comprising inner winding sections (21 a, 22a) and outer winding sections (21 b, 22b), wherein on outer ends of the outer winding sections (21 b, 22b), outer flanges (21c, 22c) are provided, wherein, in the outer end surface of each of the outer flanges (21 c, 22c), a recessed section (21 d, 22d) for winding the Z-axis winding wire (7) is provided, the recessed sections (21 d) provided on the X-axis leg sections (21) extending in the Y-axis direction and the recessed sections (22d) provided on the Y-axis leg sections (22) extending in the X-axis direction. - The antenna coil (10) according to claim 1, wherein the core member (2) is formed into a cross shape in which the X-axis leg section (21) and the Y-axis leg section (22) are made to cross each other at the midpoint of the X-axis leg section (21) and the Y-axis leg section (22).
- The antenna coil (10) according to claim 2,
wherein the X-axis leg section (21) comprises the X-axis winding frame sections (3) provided on both sides of the midpoint of the X-axis leg section (21),
wherein the Y-axis leg section (22) comprises the Y-axis winding frame sections (4) provided on both sides of the midpoint of the Y-axis leg section (22), and
wherein each of the X-axis winding frame section (3) and the Y-axis winding frame section (4) comprises the intermediate flange section (31, 41), so that each of the winding frame sections (3, 4) is divided by the intermediate flange section (31, 41) into a plurality of winding frame sections (3a, 3b, 4a, 4b). - The antenna coil (10) according to one of the preceding claims, wherein the outer winding sections (21 b) of the X-axis leg section (21) have a larger Y-axis direction width and a smaller Z-axis direction thickness than the inner winding sections (21 a) of the X-axis leg section (21), and wherein the outer winding sections (22b) of the Y-axis leg section (22) have a larger X-axis direction width and a smaller Z-axis direction thickness than the inner winding sections (22a) of the Y-axis leg section (22).
- The antenna coil (10) according to one of claim 1 to claim 4, wherein the intermediate flange section (31, 41) is formed into a plate-shaped intermediate flange section (31, 41) made of the core member (2).
- The antenna coil (10) according to one of claim 1 to claim 5, wherein the outer flanges (21 c, 22c) are made of the core member (2) and are provided at the outer end of the X-axis leg section and the Y-axis leg section so as to be in parallel with the intermediate flange section (31, 41).
- The antenna coil (10) according to one of claim 5 and claim 6, wherein the inner winding wire (5a, 6a) wound around the inner winding frame section (3a, 4a) provided on the inner side of the intermediate flange section (31, 41) is wound with a smaller number of turns, and the outer winding wire (5b, 6b) wound around the outer winding frame section (3b, 4b) provided on the outer side of the intermediate flange section (31, 41) is wound with a larger number of turns.
- The antenna coil (10) according to one of claim 5 and claim 6, wherein the width of the X-axis leg section (21) and the Y-axis leg section (22) is made smaller in the inner winding sections (21a, 22a) corresponding to the inner winding frame sections (3a, 4a) provided on the inner side of the intermediate flange section (31, 41), and is made larger in the outer winding sections (21 b, 22b) corresponding to the outer winding frame sections (3b, 4b) provided on the outer side of the intermediate flange section.
- The antenna coil (10) according to one of claim 1 to claim 8, wherein the winding frame sections (3a, 3b, 4a, 4b) separated by the intermediate flange section (31, 41) are configured such that at least either the number of turns of the winding or the cross-sectional area of the core member (2) is different between the winding frame sections (3a, 4a, 3b, 4b).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15180569.4A EP2966655B1 (en) | 2010-02-15 | 2011-02-11 | Antenna coil |
Applications Claiming Priority (1)
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---|---|---|---|
JP2010030710A JP5161901B2 (en) | 2010-02-15 | 2010-02-15 | Antenna coil |
Related Child Applications (2)
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EP15180569.4A Division EP2966655B1 (en) | 2010-02-15 | 2011-02-11 | Antenna coil |
EP15180569.4A Division-Into EP2966655B1 (en) | 2010-02-15 | 2011-02-11 | Antenna coil |
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EP2360704A1 EP2360704A1 (en) | 2011-08-24 |
EP2360704B1 true EP2360704B1 (en) | 2015-09-23 |
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EP11154180.1A Active EP2360704B1 (en) | 2010-02-15 | 2011-02-11 | Antenna coil |
EP15180569.4A Active EP2966655B1 (en) | 2010-02-15 | 2011-02-11 | Antenna coil |
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EP15180569.4A Active EP2966655B1 (en) | 2010-02-15 | 2011-02-11 | Antenna coil |
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EP (2) | EP2360704B1 (en) |
JP (1) | JP5161901B2 (en) |
CN (2) | CN102195137B (en) |
DE (1) | DE15180569T1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3432421A1 (en) | 2017-07-18 | 2019-01-23 | Premo, S.A. | Three-axis antenna with improved quality factor |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5913268B2 (en) * | 2013-11-29 | 2016-04-27 | 東光株式会社 | 3-axis antenna |
EP3319174B1 (en) * | 2016-11-04 | 2020-08-12 | Premo, S.A. | A magnetic power unit |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0613213U (en) * | 1992-07-20 | 1994-02-18 | ミツミ電機株式会社 | Antenna coil device |
DE19529725A1 (en) * | 1995-08-12 | 1997-02-13 | Teves Gmbh Alfred | Coil carrier |
JP2003092509A (en) * | 2001-07-13 | 2003-03-28 | Sumida Corporation | Antenna coil |
JP3924512B2 (en) * | 2002-06-27 | 2007-06-06 | 株式会社東海理化電機製作所 | Chip multi-axis antenna |
JP2005175965A (en) * | 2003-12-11 | 2005-06-30 | Murata Mfg Co Ltd | Transmission antenna coil |
CN101901958B (en) * | 2004-03-12 | 2013-06-05 | 日商·胜美达股份有限公司 | Receiving device |
EP2293384B1 (en) * | 2006-04-07 | 2013-07-10 | Sumida Corporation | Antenna coil |
JP4742140B2 (en) * | 2006-04-10 | 2011-08-10 | スミダコーポレーション株式会社 | Coil parts |
JP2007288345A (en) * | 2006-04-13 | 2007-11-01 | Sumida Corporation | Antenna for transmission |
JPWO2008056601A1 (en) * | 2006-11-08 | 2010-02-25 | スミダコーポレーション株式会社 | Antenna device |
JP2009267767A (en) * | 2008-04-25 | 2009-11-12 | Hitachi Ferrite Electronics Ltd | Triaxial receiving antenna device for low frequency |
-
2010
- 2010-02-15 JP JP2010030710A patent/JP5161901B2/en active Active
-
2011
- 2011-02-11 EP EP11154180.1A patent/EP2360704B1/en active Active
- 2011-02-11 EP EP15180569.4A patent/EP2966655B1/en active Active
- 2011-02-11 DE DE15180569.4T patent/DE15180569T1/en active Pending
- 2011-02-14 CN CN201110038395.0A patent/CN102195137B/en active Active
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EP3432421A1 (en) | 2017-07-18 | 2019-01-23 | Premo, S.A. | Three-axis antenna with improved quality factor |
Also Published As
Publication number | Publication date |
---|---|
EP2966655A3 (en) | 2016-04-13 |
JP2011166707A (en) | 2011-08-25 |
CN102195137A (en) | 2011-09-21 |
DE15180569T1 (en) | 2016-05-12 |
CN104051854A (en) | 2014-09-17 |
JP5161901B2 (en) | 2013-03-13 |
CN102195137B (en) | 2016-08-31 |
EP2360704A1 (en) | 2011-08-24 |
CN104051854B (en) | 2016-07-13 |
EP2966655A2 (en) | 2016-01-13 |
EP2966655B1 (en) | 2019-10-23 |
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