WO2019021783A1 - Bobine d'antenne et son procédé de fabrication - Google Patents

Bobine d'antenne et son procédé de fabrication Download PDF

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Publication number
WO2019021783A1
WO2019021783A1 PCT/JP2018/025490 JP2018025490W WO2019021783A1 WO 2019021783 A1 WO2019021783 A1 WO 2019021783A1 JP 2018025490 W JP2018025490 W JP 2018025490W WO 2019021783 A1 WO2019021783 A1 WO 2019021783A1
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WO
WIPO (PCT)
Prior art keywords
magnetic core
antenna coil
resin
curing
bobbin
Prior art date
Application number
PCT/JP2018/025490
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English (en)
Japanese (ja)
Inventor
憲嗣 内藤
裕子 大塩
Original Assignee
株式会社村田製作所
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to CN201880047340.6A priority Critical patent/CN110892582B/zh
Priority to JP2019532478A priority patent/JP6881584B2/ja
Publication of WO2019021783A1 publication Critical patent/WO2019021783A1/fr

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
    • 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
    • H01Q7/06—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 with core of ferromagnetic material
    • H01Q7/08—Ferrite rod or like elongated core

Definitions

  • the present invention relates to an antenna coil and a method of manufacturing the same.
  • an antenna coil for transmitting information or power at a short distance using an electromagnetic wave of a predetermined frequency is known (see, for example, Patent Document 1).
  • the antenna coil of Patent Document 1 includes a magnetic core (first magnetic core) and a coil wound around the magnetic core.
  • magnetic pieces second magnetic cores
  • the inductance value of the coil is adjusted to approach a value corresponding to the resonant frequency of the antenna coil.
  • the position of the magnetic piece is fixed using an adhesive or the like.
  • an object of the present invention is to solve the above-mentioned problems, and to provide an antenna coil capable of precisely adjusting the inductance value of the coil and a method of manufacturing the same.
  • a first magnetic core, a coil wound around the first magnetic core, and relative to the first magnetic core are used.
  • Preparing an antenna coil comprising a second magnetic core, the position of which can be adjusted, and setting the inductance value of the coil closer to the inductance value corresponding to the resonance frequency After the position adjusting step of adjusting the relative position of the second magnetic core and the position adjusting step, the light beam is irradiated to the resin containing the photocurable resin disposed around the second magnetic core.
  • a first curing step of curing at least the exposed surface of the photocurable resin, and an uncured portion of the resin containing the photocurable resin after the first curing step The and a second curing step of curing by the curing methods other than the light-curing.
  • the antenna coil according to the present invention comprises a first magnetic core, a coil wound around the first magnetic core, and a second magnetic core, and the second magnetic core is It fixes with what hardened
  • the inductance value of the coil can be adjusted with high accuracy.
  • Plan view of the antenna coil of the first embodiment Side view of the antenna coil of Embodiment 1
  • the perspective view of the antenna coil of Embodiment 1 A perspective view showing a first magnetic core and a second magnetic core of Embodiment 1 Top view showing the second magnetic core of the first embodiment
  • the figure for demonstrating the manufacturing method of the antenna coil of Embodiment 1. The figure for demonstrating the manufacturing method of the antenna coil of Embodiment 1.
  • the figure for demonstrating the manufacturing method of the antenna coil of Embodiment 1. The figure for demonstrating the manufacturing method of the antenna coil of Embodiment 1.
  • the figure for demonstrating the manufacturing method of the antenna coil of Embodiment 1. The figure for demonstrating the manufacturing method of the antenna coil of Embodiment 1.
  • the figure for demonstrating the manufacturing method of the antenna coil of Embodiment 1. The figure for demonstrating the manufacturing method of the antenna coil of Embodiment 1.
  • the figure for demonstrating the manufacturing method of the antenna coil of Embodiment 1 The top view which shows the accommodating part of the bobbin by modification 1
  • the first magnetic core, the coil wound around the first magnetic core, and the second position adjustable relative to the first magnetic core Preparing an antenna coil comprising a magnetic core, and relating the second magnetic core relative to the first magnetic core such that the inductance value of the coil approaches the inductance value corresponding to the resonant frequency.
  • the light curing is performed by irradiating a light beam to a resin containing a photocurable resin disposed around the second magnetic substance core.
  • the uncured portion of the resin containing the photocurable resin is cured by a curing method other than photocuring Comprising a second curing step, and to provide a manufacturing method of the antenna coil.
  • the uncured portion is cured by a method other than the photocuring method to fix the second magnetic core.
  • the second magnetic core is positioned with high accuracy while suppressing the positional deviation of the second magnetic core as compared with the case where the second magnetic core is fixed using an adhesive or the like having only a thermosetting property. It is possible to adjust the inductance value of the coil with high accuracy.
  • the photocurable resin is a thermosetting resin
  • the resin containing the photocurable resin further includes a thermosetting resin
  • the second curing step includes: The manufacturing method of the antenna coil as described in a 1st aspect which hardens
  • the second curing step by performing the second curing step by heat curing, it is possible to cure the uncured portion of the resin faster than in the case of leaving without applying heat or the like.
  • the exposed surface of the resin is cured in the first curing step, even when heat is used in the second curing step, the positional deviation of the second magnetic core due to the influence of thermal expansion and the like is suppressed. Thereby, the second curing step can be performed quickly while positioning the second magnetic core with high accuracy.
  • the manufacturing of the antenna coil as described in the second aspect further comprising a moving step of moving the antenna coil to a heating chamber between the first curing step and the second curing step.
  • a moving step of moving the antenna coil to a heating chamber between the first curing step and the second curing step Provide a way.
  • the second curing step is performed in the heating chamber, and the first curing step is performed in a place different from the heating chamber, so that the resin is cured in the place suitable for each curing step. be able to.
  • the exposed surface of the resin is cured in the first curing step, even when the antenna coil is moved between the first curing step and the second curing step, the positional deviation of the second magnetic core due to the movement is suppressed. be able to.
  • the photocurable resin is an ultraviolet curable resin
  • the light beam used in the first curing step is ultraviolet light.
  • the present invention provides a method of manufacturing an antenna coil. According to such a method, a general-purpose resin can be used by using an ultraviolet curable resin as the photocurable resin, and the manufacturing cost of the antenna coil can be reduced.
  • a bobbin accommodating the first magnetic body core and the second magnetic body core is further provided, the coil is wound around the body of the bobbin, and the bobbin is mounted on the bobbin.
  • the method of manufacturing an antenna coil as described in the fifth aspect wherein the bobbin provided with a light beam path at an end edge portion of the accommodating portion is used as the bobbin.
  • the resin in the housing portion by providing a light beam path at the end edge portion of the housing portion, it becomes easy to irradiate the light beam to the resin in the housing portion, and the resin can be cured in a wider range in the first curing step. it can. Thereby, the positioning accuracy of the second magnetic core by the first curing step can be improved.
  • the antenna coil as described in the fifth aspect or the sixth aspect wherein a material having a higher light reflectivity than the material constituting the inner wall surface is attached to the inner wall surface of the housing portion.
  • the method of manufacturing an antenna coil according to any one of the fifth to seventh aspects wherein the surface roughness Ra of the inner wall surface of the housing portion is set to 100 or less.
  • the photocurable resin can be cured in a wider range, and the positioning accuracy of the second magnetic core in the first curing step can be improved.
  • the method of manufacturing an antenna coil according to any one of the fifth to eighth aspects wherein the color of the inner wall surface of the housing portion is white. According to such a method, since the light beam is easily reflected in the housing portion, the photocurable resin can be cured in a wider range, and the positioning accuracy of the second magnetic core in the first curing step can be improved. Can.
  • a first magnetic core, a coil wound around the first magnetic core, and a second magnetic core, the second magnetic core comprising An antenna coil is provided, wherein a resin including a photocurable resin disposed around the periphery thereof is fixed with a cured resin.
  • the antenna coil by fixing the second magnetic core with the resin by the photo-curing method.
  • positional deviation of the second magnetic core is less likely to occur, and the inductance value of the coil can be accurately adjusted.
  • the antenna coil can be manufactured by any of the manufacturing methods.
  • the antenna according to the tenth aspect wherein the photocurable resin is a thermosetting resin, or the resin containing the photocurable resin further includes a thermosetting resin.
  • the antenna coil can be manufactured by the method of curing the resin by the thermosetting method and fixing the second magnetic core after performing the photocuring method. According to such a method, it is possible to cure the uncured portion of the resin faster than in the case where it is left without applying heat after photocuring.
  • the antenna coil according to the tenth aspect or the eleventh aspect wherein the photocurable resin is an ultraviolet curable resin.
  • the photocurable resin is an ultraviolet curable resin.
  • a bobbin for housing the first magnetic body core and the second magnetic body core, the coil is wound around the body portion of the bobbin, and the bobbin is
  • the present invention provides the antenna coil according to any one of the tenth to twelfth aspects, wherein a concave housing portion for housing the second magnetic body core is provided. According to such a configuration, by providing the bobbins accommodating the two cores of the first magnetic body core and the second magnetic body core, the workability at the time of handling the antenna coil can be improved.
  • the antenna coil according to the thirteenth aspect wherein the bobbin is provided with a light beam path at an end edge portion of the housing portion.
  • the bobbin is provided with a light beam path at an end edge portion of the housing portion.
  • the antenna coil as set forth in the thirteenth aspect or the fourteenth aspect, wherein a material having a higher light reflectivity than the material constituting the inner wall surface is attached to the inner wall surface of the housing portion.
  • a material having a higher light reflectivity than the material constituting the inner wall surface is attached to the inner wall surface of the housing portion.
  • the antenna coil according to any one of the thirteenth to fifteenth aspects, wherein the surface roughness Ra of the inner wall surface of the housing portion is set to 100 or less. According to such a configuration, since the light beam is easily reflected in the housing portion, the photocurable resin can be cured in a wider range, and the positioning accuracy of the second magnetic core can be improved. An antenna coil can be manufactured.
  • the antenna coil according to any one of the thirteenth to sixteenth aspects, wherein the color of the inner wall surface of the housing portion is white. According to such a configuration, since the light beam is easily reflected in the housing portion, the photocurable resin can be cured in a wider range, and the positioning accuracy of the second magnetic core can be improved. An antenna coil can be manufactured.
  • FIG. 1 is a plan view of the antenna coil 2 of the first embodiment
  • FIG. 2 is a side view of the antenna coil 2
  • FIG. 3 is a perspective view of the antenna coil 2.
  • the antenna coil 2 in the first embodiment is a communication component used in a system for transmitting information at a short distance using electromagnetic waves of a predetermined frequency (for example, about 125.0 kHz).
  • the antenna coil 2 is mounted and used in a car as a communication component for keyless entry of the car, for example.
  • the antenna coil 2 shown in FIGS. 1 to 3 includes a first magnetic core 4, a second magnetic core 6, a coil 8 and a bobbin 10.
  • the first magnetic core 4 and the second magnetic core 6 are members made of a magnetic material such as ferrite (ferrite core).
  • the first magnetic core 4 and the second magnetic core 6 are housed in the bobbin 10.
  • the first magnetic core 4 is positioned and fixed by the bobbin 10.
  • the positioning resin 14 (FIG. 6F) is disposed around the second magnetic core 6 in a cured state.
  • the second magnetic core 6 is positioned by the cured resin 14.
  • FIG. 4 A state in which only the first magnetic core 4 and the second magnetic core 6 are illustrated is shown in FIG.
  • the first magnetic core 4 in the first embodiment is configured in a bar shape.
  • the second magnetic core 6 is formed in a substantially columnar shape whose size is significantly smaller than that of the first magnetic core 4.
  • FIG. 5 A plan view of the second magnetic core 6 is shown in FIG. As shown in FIG. 5, as the second magnetic core 6 in the first embodiment, one having a dimension A in the longitudinal direction different from a dimension B in the lateral direction in plan view is used. By rotating the second magnetic core 6 in the R direction shown in FIGS. 4 and 5, the relative position to the first magnetic core 4 is changed.
  • the coil 8 shown in FIGS. 1 to 3 is a conductor coil (winding) wound around the first magnetic core 4. As shown in FIGS. 1 and 3, the coil 8 of the first embodiment is wound around the body of the bobbin 10 and is not in direct contact with the first magnetic core 4.
  • the first magnetic core 4 is disposed inside the coil 8.
  • the second magnetic core 6 is disposed in the vicinity of the first magnetic core 4 and the coil 8.
  • the coil 8 has an inductance value corresponding to the positions of the first magnetic core 4 and the second magnetic core 6 disposed inside and near the coil 8.
  • the inductance value of the coil 8 is adjusted to approach a value corresponding to a predetermined resonance frequency (for example, 125.0 kHz) in the antenna coil 2.
  • the coil 8 is adjusted by adjusting the rotational position of the second magnetic core 6 shown in FIG. 5 and the like, and changing the relative position of the second magnetic core 6 with respect to the first magnetic core 4.
  • the inductance value of is adjusted.
  • the second magnetic core 6 is disposed in the vicinity of the first magnetic core 4 and the coil 8 within a range in which the inductance value of the coil 8 can be adjusted. The specific adjustment method will be described later.
  • the bobbin 10 is a case member that accommodates the first magnetic core 4 and the second magnetic core 6.
  • the bobbin 10 is a substantially cylindrical member that forms a space that can accommodate the first magnetic core 4 and the second magnetic core 6.
  • the bobbin 10 is formed of an insulating material such as plastic (black plastic in the first embodiment).
  • the bobbin 10 is provided with a housing portion 12 for housing the second magnetic core 6.
  • the housing portion 12 in the first embodiment is a recess in which the upper surface of the bobbin 10 is recessed downward.
  • the second magnetic core 6 and the resin 14 (FIG. 1) hardened around the second magnetic core 6 are disposed in the housing 12, and the second magnetic core 6 is positioned in the housing 12. ⁇ It is held.
  • the antenna coil 2 is prepared (step S1: preparation step). Specifically, the antenna coil 2 before arranging the resin 14 in the configuration shown in FIGS. 1 to 3 is prepared.
  • the antenna coil 2 shown in FIG. 6A includes a first magnetic core 4, a second magnetic core 6, a coil 8, and a bobbin 10.
  • the second magnetic core 6 is accommodated in the accommodating portion 12, and the accommodating portion 12 is not filled with the resin 14.
  • step S2 resin placement step
  • the resin 14 is filled in the housing portion 12 housing the second magnetic core 6.
  • the resin 14 is disposed around the second magnetic core 6.
  • resin 14 liquid resin before hardening is used.
  • FIG. 6B shows a state in which the second magnetic core 6 is moved upward for the sake of convenience.
  • the second magnetic core 6 is movable while being in contact with the liquid resin 14 before curing.
  • the resin 14 a resin having both “ultraviolet curable” and “thermo curable” characteristics is used.
  • curing is performed through a two-step curing step of a first curing step S 4 by ultraviolet curing described later and a second curing step S 6 by thermal curing. Is possible.
  • Such resin 14 may be made of, for example, a plurality of types of resins in which an ultraviolet curable resin and a thermosetting resin are mixed. Alternatively, it may be one kind of resin having both of the functions of ultraviolet curing and thermosetting.
  • Step S3 position adjustment step
  • the second magnetic substance core 6 in the first rotational position is in the R direction Rotate to.
  • the 2nd magnetic material core 6 is arrange
  • the rotational position of the second magnetic core 6 By changing the rotational position of the second magnetic core 6, the relative position of the second magnetic core 6 to the first magnetic core 4 changes.
  • the inductance value of the coil 8 wound around the second magnetic core 6 changes around the first magnetic core 4.
  • the rotational position of the second magnetic core 6 is adjusted such that the inductance value of the coil 8 becomes an inductance value corresponding to a predetermined resonance frequency.
  • step S4 temporary curing of the resin 14 is performed (step S4: first curing step). Specifically, the resin 14 is cured by an ultraviolet curing method using ultraviolet light. More specifically, as shown in FIG. 6E, the ultraviolet ray irradiation unit 16 disposed above the accommodation unit 12 irradiates the accommodation unit 12 with the ultraviolet light 18.
  • the resin 14 in the housing portion 12 is partially cured. Specifically, as shown in the vertical cross-sectional view of FIG. 6F, the upper portion of the resin 14 including the exposed surface 20 is cured to be a cured portion 22. The lower portion of the resin 14 is not cured by blocking the ultraviolet light 18 by the cured portion 22, and becomes an uncured portion 24.
  • the second magnetic core 6 can be positioned.
  • the resin 14 is cured to an extent necessary to suppress the displacement of the second magnetic core 6.
  • the irradiation time of the ultraviolet light 18 in the first curing step S4 may be appropriately set according to the type of the resin 14, the intensity of the ultraviolet light 18, and the like.
  • the first curing step S4 is an ultraviolet curing method using ultraviolet rays 18, it is carried out at normal temperature. As described above, since the antenna coil 2 is not heated, it is possible to prevent the rotational position of the second magnetic core 6 from being shifted by deformation of the bobbin 10 and the like constituting the housing portion 12 due to thermal expansion. Can. Thereby, positioning of the 2nd magnetic body core 6 can be performed with sufficient accuracy.
  • a UV curable resin is used particularly among the photocurable resins, so that a general purpose resin can be used, and the manufacturing cost of the antenna coil 2 can be reduced.
  • the first curing step S4 described above is performed while maintaining the position and the orientation of the antenna coil 2 without moving the antenna coil 2 from the position adjustment step S3. That is, the first curing step S4 is performed in a state in which the second rotational position of the second magnetic core 6 is maintained. In this manner, the positional deviation of the second magnetic core 6 can be suppressed at the transition from the position adjustment step S3 to the first curing step S4.
  • the time interval from the completion of the position adjustment step S3 to the execution of the first curing step S4 is set to a short time.
  • the antenna coil 2 is moved (step S5: moving step). Specifically, as shown in FIG. 6G, the antenna coil 2 is moved from the ultraviolet irradiation chamber 28 in which the ultraviolet irradiation unit 16 was provided to the heating chamber 26 located at a different place from the ultraviolet irradiation chamber 28 (arrow C ).
  • a transport unit 32 for example, a robot arm
  • the heating chamber 30 is provided with a heating unit 30 (for example, a heater) capable of heating the resin 14 of the antenna coil 2.
  • the antenna coil 2 is arranged horizontally (horizontally placed) in the ultraviolet irradiation chamber 28, whereas the antenna coil 2 is vertically arranged in the heating chamber 26 to promote the heating of the resin 14. Arrange (vertically). As described above, according to the movement step S5 of the first embodiment, not only the position of the antenna coil 2 but also the direction thereof is changed.
  • the resin 14 is partially cured by the above-described first curing step S4 with respect to the change of the position and the orientation of the antenna coil 2 as described above, and the second magnetic core 6 is positioned. Therefore, position shift of the 2nd magnetic substance core 6 accompanying change of a position and direction of antenna coil 2 can be controlled. Thus, the inductance value of the coil 8 can be adjusted with high accuracy.
  • step S6 main curing of the resin 14 is performed (step S6: second curing step). Specifically, the resin 14 is cured by a curing method different from the ultraviolet curing method of the first curing step S4.
  • the resin 14 is cured by a thermal curing method using the heating means 30.
  • the resin 14 of the antenna coil 2 is heated using the heating means 30 (for example, at 100 ° C. for one hour).
  • the uncured portion 24 of the resin 14 shown in FIG. 6F is cured.
  • the second curing step S6 uses the heat not utilized in the first curing step S4, curing is performed up to the uncured portion 24 on the lower side of the resin 14 which the ultraviolet rays 18 did not reach in the first curing step S4. It can be done.
  • the entire resin 14 is cured.
  • the rotational position of the second magnetic core 6 is firmly positioned and fixed.
  • a highly reliable holding strength for the second magnetic core 6 can be realized.
  • the “hard curing method” is not cured as compared with the case where the uncured portion 24 is cured by being left without applying heat. Portions 24 can be cured faster. Further, since the exposed surface 20 of the resin 14 is cured in the first curing step S4, even when heat is used in the second curing step S6, the positional deviation of the second magnetic core 6 due to the influence of thermal expansion and the like is suppressed Be done. Thus, the second curing step can be completed quickly while positioning the second magnetic core 6 with high accuracy.
  • the apparatus configuration suitable for each step of the first curing step and the second curing step can be obtained, and each step is accurate. It can be done well.
  • the resin 14 having the characteristics of both UV curing and thermosetting is cured by the UV curing method and then cured by the UV curing method.
  • the second magnetic core 6 is fixed by further curing. According to such a method, compared to the case where the second magnetic core 6 is fixed using a silicon adhesive or the like having only a thermosetting property, after the position adjustment of the second magnetic core 6 Misalignment can be suppressed, and the inductance value of the coil 8 can be accurately adjusted. Thereby, the antenna coil 2 having a desired frequency with a small tolerance from the resonance frequency can be manufactured.
  • the second magnetic body core 6 is fixed using an adhesive having only the thermosetting property.
  • the tolerance of the frequency of the antenna coil 2 can be reduced to half or less.
  • Modification 1 The accommodating part 40 by the modification 1 is shown in FIG. In FIG. 7, the second magnetic core 6 and the resin 14 are omitted, and only the housing portion 40 is illustrated.
  • the accommodating portion 40 according to the first modification is provided with a recessed portion 44 by indenting the end edge portion 42 located at the upper end of the accommodating portion 40 inward.
  • the recess 44 functions as an additional light beam path for guiding the ultraviolet light 18 described above to the housing 40.
  • the ultraviolet rays 18 described above can be irradiated to a wider range of the resin 14.
  • the resin 14 can be cured in a wider range in the first curing step S4, and the positioning accuracy of the second magnetic core 6 in the first curing step S4 can be improved.
  • the recessed part 44 is divided and provided in three places in the example shown in FIG. 7, the number of a recessed part 44, a place, and a magnitude
  • the light beam path may be provided by any method such as providing a notch in the containing portion 40 or providing a through hole.
  • Modification 2 The accommodating part 50 by the modification 2 is shown in FIG. Similarly, in FIG. 8, the second magnetic core 6 and the resin 14 are not shown.
  • the housing portion 50 has an inner wall surface 52, and the inner wall surface 52 constitutes the bottom and side surfaces of the housing portion 50.
  • the surface roughness Ra of the inner wall surface 52 is set to 100 or less.
  • the resin 14 can be cured in a wider range. Thereby, the positioning accuracy of the 2nd magnetic material core 6 by 1st hardening step S4 can be improved.
  • the surface roughness of the inner wall surface 52 of the housing portion 50 is set, for example, by selecting the material forming the inner wall surface 52 as one having a low surface roughness, or by performing processing to make the surface of the inner wall surface 52 smooth. It may be realized.
  • Modification 3 Although the modification 2 shown in FIG. 8 describes the case where the surface roughness of the inner wall 52 is set, the present invention is not limited to such a case, and it is more reflective than the material (for example, plastic) constituting the inner wall 52. A high material may be adhered and welded to the inner wall surface 52. Even in such a case, since the ultraviolet rays 18 are easily reflected in the housing portion 50, the resin 14 can be cured in a wider range, and the positioning accuracy of the second magnetic core 6 in the first curing step S4 Can be improved.
  • the material for example, plastic
  • the entire bobbin 10 is made of black plastic in the first embodiment, the present invention is not limited to such a case, and the color of the inner wall 52 may be white. Further, the color of the inner wall surface 52 may be a color having high light reflectivity, such as silver. Even in such a case, since the ultraviolet rays 18 are easily reflected in the housing portion 50, the resin 14 can be cured in a wider range, and the positioning accuracy of the second magnetic core 6 in the first curing step S4 Can be improved.
  • Second Embodiment The antenna coil of Embodiment 2 which concerns on this invention is demonstrated using FIG. In the second embodiment, points different from the first embodiment will be mainly described.
  • the position adjustment is performed by rotating the second magnetic core 6, whereas in the second embodiment, the second magnetic core 64 is slid relative to the first magnetic core 62.
  • This embodiment differs from the first embodiment in that the position adjustment is performed.
  • the first magnetic core 4 and the second magnetic core 6 are accommodated in the bobbin 10, and the coil 8 is wound around the bobbin 10.
  • the bobbin is provided. Instead, the coil 66 is directly wound around the first magnetic core 62.
  • the antenna coil 60 of the second embodiment includes a first magnetic core 62, a second magnetic core 64, and a coil 66.
  • the first magnetic core 62 and the second magnetic core 64 are formed in a rod shape by a magnetic material such as ferrite.
  • the first magnetic core 62 is provided with a groove 68 extending in the axial direction D.
  • the second magnetic core 64 is slidably disposed in the groove 68.
  • a coil 66 is wound around the first magnetic core 62.
  • the coil 66 does not interfere with the sliding of the second magnetic core 64 disposed in the groove 68.
  • the sliding position of the second magnetic core 64 is adjusted so that the inductance value of the coil 66 becomes the inductance value corresponding to the predetermined resonance frequency.
  • the second magnetic core 64 is fixed by curing the resin 14 (not shown in FIG. 9) similar to that of the first embodiment described above.
  • the resin 14 may be filled in the gap between the first magnetic core 62 and the second magnetic core 64.
  • the method of manufacturing the antenna coil 60 of the second embodiment described above is the same as the method of manufacturing the antenna coil 2 of the first embodiment. Specifically, in the configuration shown in FIG. 9, a preparation step S11 of preparing the antenna coil 60 before placing the resin 14 is performed. Next, a resin disposing step S12 of disposing the resin 14 around the second magnetic core 64 is performed. Next, position adjustment step S13 which adjusts the relative position of the 2nd magnetic body core 64 to the 1st magnetic body core 62 is performed. Next, a first curing step S14 of curing at least the exposed surface 20 of the resin 14 is performed. Next, a moving step S15 of moving the antenna coil 60 to the heating chamber 26 is performed. Next, a second curing step S16 of curing the uncured portion 24 of the resin 14 is performed.
  • the method of manufacturing the above-described antenna coil 60 is the same as that of the first embodiment, so the illustration is omitted.
  • the present invention has been described above by citing the above first and second embodiments, but the present invention is not limited to the above first and second embodiments.
  • the case where the ultraviolet curing is performed by irradiating the ultraviolet ray 18 to the resin 14 including the ultraviolet curable resin in the first curing step S4 has been described, but the present invention is not limited thereto.
  • the resin 14 may be cured by irradiating a light beam having a wavelength different from that of the ultraviolet light.
  • the resin 14 is not limited to the ultraviolet curable resin as long as it contains a "photo curable resin".
  • the first curing step S4 may be any curing of at least the exposed surface 20 of the resin 14 by a photo-curing method using a light beam of an arbitrary wavelength.
  • a general-purpose resin can be used, and the manufacturing cost of the antenna coil 2 is reduced. can do.
  • the present invention is not limited to such a case.
  • the resin 14 does not have thermosetting property, and the uncured portion 24 of the resin 14 may be cured by leaving the resin 14 at normal temperature. That is, 2nd hardening step S6 should just harden the unhardened part 24 of resin 14 with the arbitrary hardening methods different from the photocuring method of 1st hardening step S4.
  • the second curing is performed as compared to the case where the resin 14 is left to be cured.
  • Step S6 can be completed early. Further, since the exposed surface 20 of the resin 14 is cured in the first curing step S4, even when heat is used in the second curing step S6, the positional deviation of the second magnetic core 6 due to the influence of thermal expansion and the like is suppressed The second magnetic core 6 can be positioned with high accuracy.
  • the moving step S5 is provided between the first curing step S4 and the second curing step S6 .
  • the present invention is not limited to such a case. It is also good. That is, without moving the antenna coil 2 in the first curing step S4 and the second curing step S6, the process may be performed continuously in the same place.
  • the moving step S5 is provided between the first curing step S4 and the second curing step S6, an apparatus configuration suitable for each step can be obtained, and each step can be performed with high accuracy. it can.
  • the present invention is not limited to such a case. It may be. That is, after the resin 14 is disposed in the accommodation portion 12, the second magnetic core 6 may be disposed in the accommodation portion 12. In other words, the resin 14 may be disposed around the second magnetic core 6 at the start of the first curing step S4 at the latest.
  • the present invention is applicable if it is an antenna coil and its manufacturing method.
  • Reference Signs List 2 antenna coil 4 first magnetic core 6 second magnetic core 8 coil 10 bobbin 12 accommodation portion 14 resin 16 ultraviolet ray irradiation portion 18 ultraviolet ray 20 exposed surface 22 cured portion 24 uncured portion 26 heating chamber 28 ultraviolet irradiation chamber 30 heating means 32 conveyance part 40 accommodation part 42 edge part 44 recessed part (light ray path) Reference Signs List 50 accommodation unit 52 inner wall surface 60 antenna coil 62 first magnetic core 64 second magnetic core 66 coil 68 groove

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

Le procédé de fabrication de bobine d'antenne selon la présente invention comprend : une étape de préparation pour préparer une bobine d'antenne qui comprend un premier noyau magnétique, une bobine enroulée autour du premier noyau magnétique, et un second noyau magnétique capable d'ajuster la position relative par rapport au premier noyau magnétique; une étape d'ajustement de position pour ajuster la position relative du second noyau magnétique par rapport au premier noyau magnétique de telle sorte que la valeur d'inductance de la bobine est proche d'une valeur d'inductance correspondant à une fréquence de résonance; une première étape de durcissement consistant à appliquer, après l'étape d'ajustement de position, un faisceau lumineux à une résine disposée autour du second noyau magnétique, ladite résine contenant une résine photodurcissable, ce qui permet de durcir au moins la surface exposée de la résine photodurcissable; et une seconde étape de durcissement pour durcir, au moyen de procédés de durcissement à l'exclusion du photodurcissement, une partie non durcie de la résine contenant une résine photodurcissable après la première étape de durcissement.
PCT/JP2018/025490 2017-07-25 2018-07-05 Bobine d'antenne et son procédé de fabrication WO2019021783A1 (fr)

Priority Applications (2)

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CN201880047340.6A CN110892582B (zh) 2017-07-25 2018-07-05 天线线圈及其制造方法
JP2019532478A JP6881584B2 (ja) 2017-07-25 2018-07-05 アンテナコイルおよびその製造方法

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JP2017143736 2017-07-25
JP2017-143736 2017-07-25

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WO2019021783A1 true WO2019021783A1 (fr) 2019-01-31

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Citations (3)

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JPH04127406A (ja) * 1990-06-29 1992-04-28 Tdk Corp インダクタンス高精度コイル装置
JP2005191820A (ja) * 2003-12-25 2005-07-14 Murata Mfg Co Ltd 送信アンテナコイル
JP2008270438A (ja) * 2007-04-18 2008-11-06 Sagami Ereku Kk インダクタおよびその製造方法

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WO2003036760A1 (fr) * 2001-10-22 2003-05-01 Sumida Corporation Bobine d'antenne et antenne de transmission
US7372421B2 (en) * 2004-03-04 2008-05-13 Matsushita Electric Industrial Co., Ltd. Antenna device and communication system using it
JP2006165460A (ja) * 2004-12-10 2006-06-22 Taiyo Yuden Co Ltd 面実装コイル及び面実装コイルの製造方法
JP4127406B2 (ja) * 2005-09-05 2008-07-30 喜通 大川 防水シートのジョイント部の平滑敷設工法及び平滑敷設構造に用いる溶接帯
DE602006017114D1 (de) * 2006-02-08 2010-11-04 Sumida Corp Spule für eine antenne
WO2008062588A1 (fr) * 2006-11-24 2008-05-29 Murata Manufacturing Co., Ltd. Enroulement d'antenne
US20090128437A1 (en) * 2007-05-29 2009-05-21 Kensaku Sonoda Antenna
JP2009118270A (ja) * 2007-11-07 2009-05-28 Sumida Corporation アンテナ用コイル装置
JP4888745B2 (ja) * 2009-08-12 2012-02-29 Ｔｄｋ株式会社 コイル部品
JP5658153B2 (ja) * 2009-07-24 2015-01-21 株式会社東芝 コイルアンテナとそれを用いた電子機器
JP5885121B2 (ja) * 2011-10-06 2016-03-15 日立金属株式会社 アンテナ用コイル部品
JP6241482B2 (ja) * 2014-01-20 2017-12-06 株式会社村田製作所 アンテナ部品

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JPH04127406A (ja) * 1990-06-29 1992-04-28 Tdk Corp インダクタンス高精度コイル装置
JP2005191820A (ja) * 2003-12-25 2005-07-14 Murata Mfg Co Ltd 送信アンテナコイル
JP2008270438A (ja) * 2007-04-18 2008-11-06 Sagami Ereku Kk インダクタおよびその製造方法

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JP6881584B2 (ja) 2021-06-02
CN110892582A (zh) 2020-03-17
JPWO2019021783A1 (ja) 2020-04-09

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