WO2024166469A1 - インダクタおよびその製造方法 - Google Patents

インダクタおよびその製造方法 Download PDF

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Publication number
WO2024166469A1
WO2024166469A1 PCT/JP2023/040235 JP2023040235W WO2024166469A1 WO 2024166469 A1 WO2024166469 A1 WO 2024166469A1 JP 2023040235 W JP2023040235 W JP 2023040235W WO 2024166469 A1 WO2024166469 A1 WO 2024166469A1
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WIPO (PCT)
Prior art keywords
magnetic core
electrode member
end surface
coil element
region
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.)
Ceased
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PCT/JP2023/040235
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English (en)
French (fr)
Japanese (ja)
Inventor
智宏 杉村
祐也 石田
直弥 本田
真司 藤本
巧 谷川
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to JP2024576110A priority Critical patent/JPWO2024166469A1/ja
Publication of WO2024166469A1 publication Critical patent/WO2024166469A1/ja
Anticipated expiration legal-status Critical
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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
    • 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
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils

Definitions

  • This disclosure relates to inductors used in various electronic devices and methods for manufacturing the same.
  • inductors have been proposed in which the magnetic core is formed by embedding the coil element in a mixture of metallic magnetic powder and a binder made of thermosetting resin, and then pressurizing the mixture. Also, in order to reduce the cost of forming the external electrodes, a manufacturing method for inductors has been proposed in which the material that will become the external electrodes is molded at the same time as the magnetic core is formed.
  • Patent Document 1 is known as prior art literature related to the disclosure of this application.
  • the external electrode When the material that will become the external electrode is placed in a mold and pressure molded, the external electrode may rub against the wall of the mold when the molded body is removed from the mold, causing damage to the external electrode. If the external electrode is damaged, this can cause problems with solderability.
  • the inductor according to the present disclosure is an inductor that contains a magnetic material powder and a binder mixed with the magnetic material powder, and has a magnetic core having a bottom surface and an end surface connected to the bottom surface, a coil element having a winding portion, and an electrode member electrically and mechanically connected to an end of the coil element, the winding portion of the coil element being embedded in the magnetic core, the electrode member being bent along the end surface and bottom surface of the magnetic core so as to have an end surface portion facing the end surface of the magnetic core and a bottom surface portion facing the bottom surface of the magnetic core, and the end surface of the electrode member
  • the portion has an inner surface facing the magnetic core and an outer surface opposite the inner surface, the inner surface of the end surface portion of the electrode member is embedded in the magnetic core, the end surface of the magnetic core has a first region connected to the bottom surface of the magnetic core and in which the electrode member is provided, and two second regions connected to the bottom surface of the magnetic core and located on either side of the first region with the first region in between, and the
  • the above configuration makes it possible to provide an inductor with excellent solderability, without damaging the electrode members even when the electrode members are placed in a mold and the magnetic core is pressure molded.
  • FIG. 1 is a perspective view of an inductor according to an embodiment of the present disclosure.
  • FIG. 2 is a cross-sectional view of an inductor according to an embodiment of the present disclosure.
  • FIG. 3 is a diagram illustrating a method for manufacturing an inductor according to an embodiment of the present disclosure.
  • FIG. 4 is a diagram illustrating a method for manufacturing an inductor according to an embodiment of the present disclosure.
  • FIG. 5 is a diagram illustrating a method for manufacturing an inductor according to an embodiment of the present disclosure.
  • FIG. 6 is a diagram illustrating a method for manufacturing an inductor according to an embodiment of the present disclosure.
  • Fig. 1 is a perspective view of an inductor according to an embodiment of the present disclosure
  • Fig. 2 is a cross-sectional view of the same inductor.
  • the outer shape of the magnetic core is indicated by dashed lines in Fig. 1.
  • the coil element 12 is made by winding an insulating-coated conductor with a diameter of about 0.3 mm, and the end 12a of the coil element is flattened to a thickness of about 0.2 mm after the insulating coating has been peeled off.
  • the magnetic core 11 is formed by embedding the coil element 12 in a magnetic core material made of a mixture of magnetic material powder made of an Fe-Si-Cr alloy and a silicone binder, and then pressurizing the material.
  • the magnetic core 11 is a rectangular parallelepiped with a planar shape of about 10 mm square and a height of about 5 mm, and has a bottom surface 11b of the magnetic core 11 and an end surface 11a of the magnetic core 11 that is connected to the bottom surface 11b of the magnetic core 11.
  • An electrode member 13 is fixed to the end surface 11a of the magnetic core 11 and is bent along the bottom surface 11b of the magnetic core 11, and the electrode member 13 is composed of an end surface portion 13a and a bottom surface portion 13b.
  • the end surface portion 13a of the electrode member 13 facing the end surface 11a of the magnetic core 11 has an inner surface facing the end surface 11a of the magnetic core 11 and an outer surface opposite the inner surface.
  • the inner surface of the end surface portion 13a of the electrode member 13 is embedded in the magnetic core 11, and at least a part of the thickness of the end surface portion 13a is embedded and fixed in the magnetic core 11.
  • the bottom surface portion 13b of the electrode member 13 facing the bottom surface 11b of the magnetic core 11 is not fixed to the magnetic core 11.
  • the electrode member 13 has a crimping portion 13d at the tip of the end surface portion 13a, and is crimped by overlapping the end portion 12a of the coil element on the electrode member 13 and bending the crimping portion 13d and crimping it to the end portion 12a of the coil element, and the crimping portion 13d and the end portion 12a of the coil element are welded together to be electrically and mechanically connected.
  • the crimped portion 13d is embedded inside the magnetic core 11 so that it faces toward the center of the magnetic core 11. By embedding the crimped and welded portion inside the magnetic core 11 in this way, the electrode member 13 is less likely to peel off from the magnetic core 11, improving reliability.
  • the electrode member 13 is punched from a flat copper plate containing 99% or more copper, and is approximately 0.15 mm thick.
  • One surface of the electrode member 13 is provided with a plating layer 13f, which is plated with nickel and then tin, and the other surface has exposed copper.
  • the electrode member 13 on the surface opposite to the surface facing the magnetic core 11 is provided with a plating layer 13f, making it easy to solder to the mounting board.
  • the bonding strength between the magnetic core 11 and the electrode member 13 can be maintained even at high temperatures, such as during solder reflow.
  • the end surface portion 13a of the electrode member 13 that faces the end surface 11a of the magnetic core 11 is embedded and fixed in the magnetic core 11, improving vibration resistance.
  • the bottom surface portion 13b of the electrode member 13 that faces the bottom surface 11b of the magnetic core 11 is not fixed to the magnetic core 11, so even if the thermal expansion coefficients of the mounting board and the inductor are different, the effects of elongation due to heat cycles can be mitigated, improving heat cycle resistance.
  • the angle A1 between the bottom surface 11b of the magnetic core 11 (in FIG. 2, the extension of the bottom surface 11b of the magnetic core 11 is shown by a dashed line) and the surface (outer surface of the end surface portion 13a) 11c (first region; shown by a dashed line in FIG. 2) of the end surface portion 13a of the electrode member 13 facing the end surface 11a of the magnetic core 11 is approximately 86.5°
  • the angle A2 between the bottom surface 11b of the magnetic core 11 and the end surfaces 11a' of the magnetic core 11 on both sides of the electrode member 13 (second region; in FIG. 2, the extension of the end surfaces 11a' of the magnetic core 11 on both sides of the electrode member 13 is shown by a dashed line) is approximately 89.5°.
  • the reference surface of the bottom surface 11b of the magnetic core 11 in this case refers to the surface of the magnetic core 11 when the magnetic core 11 is placed on a flat plate with the electrode member 13 on the bottom surface 11b side of the magnetic core 11 removed.
  • the angle A2 between the bottom surface 11b of the magnetic core 11 and the end surfaces 11a' of the magnetic core 11 on both sides of the electrode member 13 is set to approximately 89.5°, which is smaller than 90.0°, to allow the magnetic core 11 to be easily removed from the mold after pressure molding.
  • the entire magnetic core 11 tends to expand when the magnetic core 11 is removed. Therefore, the part of the electrode member 13 arranged on the end face side of the magnetic core 11 is also pressed by the wall of the mold with strong stress, making it easy to be scratched.
  • the end faces 11a' of the magnetic core 11 on both sides of the end face portion 13a of the electrode member 13 facing the end face 11a of the magnetic core 11 are closer to a right angle with the bottom face 11b of the magnetic core 11 than the end face portion 13a of the electrode member 13.
  • the end faces 11a' of the magnetic core 11 on both sides of the end face portion 13a of the electrode member 13 facing the end face 11a of the magnetic core 11 act as a support, suppressing the expansion of the surface 11c of the end face portion 13a of the electrode member 13. Therefore, the end face portion 13a of the electrode member 13 facing the end face 11a of the magnetic core 11 can be made less likely to be scratched.
  • the end surface portion 13a of the electrode member 13 has a larger inclination than the end surfaces 11a' of the magnetic core 11 on both sides of the electrode member 13, so the pressure that tends to spread toward the end surfaces 11a of the magnetic core 11 during pressure molding is dispersed along the inclination, preventing the expansion of the entire magnetic core 11.
  • the angle A3 between the surface 11c (first region) of the end surface portion 13a of the electrode member 13 facing the end surface 11a of the magnetic core 11 and the end surfaces 11a' (second regions) of the magnetic core 11 on both sides of the electrode member 13 is 2.0° or more and 5.0° or less. If this angle A3 is smaller than 2.0°, the effect of preventing scratches on the electrode member 13 is reduced, and if it is larger than 5.0°, it is undesirable because cracks are likely to occur in the magnetic core 11 when the electrode member 13 is bent from the end surface 11a of the magnetic core 11 toward the bottom surface 11b of the magnetic core 11.
  • end surface 13a of the electrode member 13 is tapered toward the mounting surface, which makes it easier for the solder to wet and rise when the inductor is mounted and soldered, and also makes it easier to check the state of the soldering from above.
  • the end 12a of the coil element is overlapped on the electrode member 13, crimped and welded, and embedded in the magnetic core 11, but the end of the coil element may protrude from the end of the magnetic core 11 and overlap the surface of the end face portion 13a of the electrode member 13 and welded.
  • the electrode member 13 can be made less likely to be scratched even when the electrode member 13 is placed in a mold and the magnetic core 11 is pressure-molded.
  • a conductor with an insulating coating on its surface is wound in a spiral shape, and both ends are pulled out in opposite directions to form the coil element 12.
  • the conductor is made of insulating copper wire with a diameter of about 0.3 mm, and the insulating coating is stripped off from the end 12a of the coil element, and it is crushed to a thickness of about 0.2 mm.
  • a plating layer 13f is formed on one surface of a copper plate containing 99% or more copper, plated with nickel and then tin, and the other surface is punched out from a flat plate with exposed copper to obtain the electrode member 13.
  • the electrode member 13 is integrally formed with an end surface portion 13a that is disposed on the end surface 11a of the magnetic core 11 and connected to the end portion 12a of the coil element, a bottom surface portion 13b that is connected to the end surface portion 13a and disposed on the bottom surface 11b of the magnetic core 11, and a support portion 13c that is connected to the bottom surface portion 13b on the opposite side to the end surface portion 13a and that will be supported by a mold when the magnetic core 11 is pressure-molded as described below.
  • the thickness of this electrode member 13 is approximately 0.15 mm.
  • Figure 3(a) is a plan view of the electrode member 13, which is connected in a straight line to the support portion 13c, bottom surface portion 13b, and end surface portion 13a, and a crimping portion 13d is provided at the tip of the end surface portion 13a opposite the bottom surface portion 13b.
  • the end portion 12a of the coil element is overlapped with this crimping portion 13d, and as shown in Figure 3(b), the crimping portion 13d is folded back and crimped onto the end portion 12a of the coil element, thereby crimping and temporarily fixing the end portion 12a of the coil element to the electrode member 13.
  • the tip of the end portion 12a of the coil element is crimped so as to overlap the electrode member 13, and the tip of the end portion 12a of the coil element protrudes from the crimping portion 13d.
  • the tip of the end portion 12a of the coil element protrudes from the crimping portion 13d.
  • the length of the crimped portion 13d is about 1.0 mm, and the length by which the tip of the end 12a of the coil element protrudes from the crimped portion 13d is about 0.3 mm. Note that each length refers to the length in the extension direction of the end 12a of the coil element.
  • the crimped portion 13d is folded back and crimped over the end 12a of the coil element, that is, the laser light irradiation position 16 shown by the dashed line in Fig. 3(b), is irradiated from the coil element 12 side toward the tip while scanning the laser light in a zigzag manner across the extension direction of the end 12a of the coil element, welding the electrode member 13 and the end 12a of the coil element, as shown in Fig. 3(c).
  • the tip of the end 12a of the coil element is not irradiated with laser light, but the heat generated by irradiating the laser light is transferred to the tip of the end 12a of the coil element, melting and solidifying it, and the edge of the tip of the end 12a of the coil element has a rounded shape.
  • the area of the crimping portion 13d opposite the tip of the end 12a of the coil element is also melted and solidified.
  • the crimping portion 13d and the end 12a of the coil element crimped to the crimping portion 13d may be completely melted to form a weld ball. In this way, the end 12a of the coil element and the electrode member 13 can be more reliably connected electrically and mechanically, and it can also be confirmed from the outside that the connection is reliable.
  • the electrode member 13 By embedding the welded portion inside the magnetic core 11, the electrode member 13 is firmly fixed to the magnetic core 11, improving reliability, but the state of the welding cannot be confirmed after the magnetic core 11 is formed. For this reason, it is desirable to perform image recognition of the tip of the end 12a of the coil element after crimping and welding, and then perform image recognition again after the welding process to confirm that the tip of the coil element is in a melted and solidified state. In this way, it is possible to proceed to the next process after confirming that the welding has been performed reliably before embedding the welded portion in the magnetic core 11, improving reliability.
  • the length by which the tip of the end 12a of the coil element protrudes from the crimped portion 13d is preferably at least 0.05 mm and not more than two-thirds the length of the crimped portion 13d. If the protruding length is less than 0.05 mm, it becomes difficult to confirm the tip of the end 12a of the coil element in the crimped state by image recognition, and if it is longer than two-thirds the length of the crimped portion 13d, heat will not be sufficiently transferred to the tip of the end 12a of the coil element, making it difficult to melt.
  • the end 12a of the coil element and the electrode member 13 are bent.
  • the coil element 12 and the end surface portion 13a of the electrode member 13 of the coil assembly 21 in which the coil element 12 and the electrode member 13 are connected and integrated are prepared for insertion into the cavity of a die for pressure molding the magnetic core 11, which will be described later.
  • the end 12a of the coil element is bent as shown in FIG. 5, the end surface portion 13a and the bottom surface portion 13b are formed in a straight line, and the support portion 13c is bent outward relative to the coil element 12.
  • the support portion 13c is used for positioning during transportation or when placed in a die, and can be cut and removed after molding.
  • a magnetic core material made of a mixture of magnetic material powder made of an Fe-Si-Cr alloy and a binder made of silicone is used, and the magnetic core material is placed in a tablet molding die and compressed at a pressure of about 0.25 tons/ cm2 to form a magnetic powder tablet that easily collapses under pressure.
  • the magnetic powder tablet is prepared separately into a lower magnetic powder tablet for forming the lower part of the magnetic core 11 and an upper magnetic powder tablet for forming the upper part of the magnetic core 11.
  • the shape of the lower magnetic powder tablet is preferably provided with a recess for accommodating the coil element 12, and is preferably a pot type with an E-shaped cross section.
  • the shape of the upper magnetic powder tablet is preferably a flat plate type so as to cover the recess of the lower magnetic powder tablet.
  • the magnetic core material is tableted and placed in a mold, but the coil assembly 21, in which the coil element and electrode member 13 are integrated, and the magnetic core material may also be placed in a mold and pressure molded.
  • Figure 6 shows a schematic diagram of the upper magnetic powder tablet 15a, the coil assembly 21 in which the coil element 12 and the electrode member 13 are integrated, and the lower magnetic powder tablet 15b placed in the cavity of the mold 14 before pressure molding.
  • the upper magnetic powder tablet 15a is placed in the mold 14, the coil assembly 21 in which the coil element 12 and the electrode member 13 are integrated is placed on top of it, the lower magnetic powder tablet 15b is placed, the upper punch 14a is lowered, and the lower punch 14b is raised to perform pressure molding at a pressure of about 4 tons/ cm2 .
  • the magnetic core 11 is molded in the cavity of the mold 14, and the bottom part 13b and the supporting part 13c of the electrode member 13 are in a state of being outside the magnetic core 11 (the cavity of the mold 14).
  • the position of the coil element 12 can be determined by the supporting part 13c of the electrode member 13 being placed on the mold.
  • a gap may be formed above the supporting part 13c. This can prevent excessive force from being applied to the coil element or the electrode member 13 during pressure molding, which can cause disconnection or the like.
  • the coil assembly 21 in which the coil element 12 and the electrode member 13 are integrated may be placed in the mold, and then the lower magnetic powder tablet 15b may be placed in the mold.
  • the coil assembly 21 in which the coil element 12 and the electrode member 13 are integrated may be combined with the lower magnetic powder tablet 15b and placed in the mold 14.
  • the coil assembly 21 in which the coil element 12 and the electrode member 13 are connected and integrated is placed in a mold cavity and pressure-molded, so that the end surface portion 13a of the electrode member 13 is pressure-molded while inside the mold cavity, and at least a part of its thickness is embedded and fixed in the magnetic core 11.
  • the bottom surface portion 13b of the electrode member 13 is pressure-molded while protruding outside the mold cavity, and is then bent toward the bottom surface of the magnetic core 11, so it is not fixed to the magnetic core 11.
  • the end surface portion 13a of the electrode member 13 is fixed to the magnetic core 11, ensuring vibration resistance
  • the bottom surface portion 13b of the electrode member 13 is not fixed to the magnetic core 11, improving heat cycle resistance.
  • the surface of end surface portion 13a of electrode member 13 that faces end surface 11a of magnetic core 11 and does not have a plating layer faces magnetic core 11.
  • a plating layer 13f is provided on the surface of electrode member 13 opposite the surface facing magnetic core 11, making it easy to solder to the mounting board. Also, because there is no plating layer on the surface of electrode member 13 facing magnetic core 11, the bonding strength between magnetic core 11 and electrode member 13 can be maintained even at high temperatures, such as during solder reflow.
  • the inner wall of the die 14 in the portion facing the end face 11a of the magnetic core 11 has an angle of approximately 86.5° between the surface of the upper punch 14a forming the bottom face 11b of the magnetic core 11 and the surface that abuts against the outer surface of the end face portion 13a of the electrode member 13, and an angle of approximately 89.5° between the surface of the upper punch 14a that becomes the bottom face 11b of the magnetic core 11 and both sides of the end face portion 13a of the electrode member 13.
  • the position of the end surface portion 13a of the electrode member 13 is determined by the mold 14, so the shape is stable. Therefore, when this inductor is mounted and soldered, it can be soldered stably.
  • the angle A1 between the bottom surface 11b of the magnetic core 11 (in FIG. 2, the extension of the bottom surface 11b of the magnetic core 11 is shown by a dashed line) and the surface 11c (first region; shown by a dashed line in FIG. 2) of the end surface portion 13a of the electrode member facing the end surface 11a of the magnetic core 11 is approximately 86.5°
  • the angle A2 between the bottom surface 11b of the magnetic core 11 and the end surfaces 11a' of the magnetic core 11 on both sides of the electrode member 13 (second region; in FIG. 2, the extension of the end surfaces 11a' of the magnetic core 11 on both sides of the electrode member 13 is shown by a dashed line) is approximately 89.5°.
  • the reference surface of the bottom surface 11b of the magnetic core 11 in this case refers to the surface placed on a flat plate with the bottom surface portion 13b of the electrode member 13 facing the bottom surface 11b of the magnetic core 11 removed.
  • the angle A2 between the bottom surface 11b of the magnetic core 11 and the end surfaces 11a' of the magnetic core 11 on both sides of the electrode member 13 is set to approximately 89.5°, which is smaller than 90.0°, to allow the magnetic core 11 to be easily removed from the mold after pressure molding.
  • the entire magnetic core 11 tends to expand when the magnetic core 11 is removed. Therefore, the electrode member 13 arranged on the end face of the magnetic core 11 is also pressed by the wall of the mold with strong stress, making it easy to be scratched.
  • the end faces 11a' of the magnetic core 11 on both sides of the end face portion 13a of the electrode member 13 facing the end face 11a of the magnetic core 11 are closer to a right angle with the bottom face 11b of the magnetic core 11 than the end face portion 13a of the electrode member 13.
  • the end faces 11a' of the magnetic core 11 on both sides of the end face portion 13a of the electrode member 13 facing the end face 11a of the magnetic core 11 act as a support, suppressing the expansion of the surface 11c of the end face portion 13a of the electrode member 13. Therefore, the end face portion 13a of the electrode member 13 facing the end face 11a of the magnetic core 11 can be made less likely to be scratched.
  • the end surface portion 13a of the electrode member 13 has a larger inclination than the end surfaces 11a' of the magnetic core 11 on both sides of the electrode member 13, so the pressure that tends to spread toward the end surfaces 11a of the magnetic core 11 during pressure molding is dispersed along the inclination, preventing the expansion of the entire magnetic core 11.
  • angle A3 between the surface 11c of the end surface portion 13a of the electrode member 13 facing the end surface 11a of the magnetic core 11 and the end surfaces 11a' of the magnetic core 11 on both sides of the electrode member 13 to 2.0° or more and 5.0° or less. If this angle A3 is smaller than 2.0°, the effect of preventing scratches on the electrode member 13 is reduced, and if it is larger than 5.0°, it is undesirable because cracks are likely to occur in the magnetic core 11 when the electrode member 13 is bent from the end surface 11a of the magnetic core 11 toward the bottom surface 11b of the magnetic core 11.
  • end surface 13a of the electrode member 13 is tapered toward the mounting surface, which makes it easier for the solder to wet and rise when the inductor is mounted and soldered, and also makes it easier to check the state of the soldering from above.
  • the electrode member 13 may be deformed so that the distance between the end surface portions 13a is reduced, and then the distance between the end surface portions 13a of the electrode member 13 may be widened so that the end surface portions 13a of the electrode member 13 abut against the inner wall of the mold 14, and the lower magnetic powder tablet 15b may be inserted and pressure molded.
  • the end surface portions 13a of the electrode member 13 are prevented from rubbing against the inner wall of the mold 14, and thus scratches can be prevented.
  • the magnetic core 11 is thermally hardened, the support portion 13c of the electrode member 13 is cut, and the bottom portion 13b is bent to obtain the inductor.
  • the inductor disclosed herein is industrially useful because it is difficult to damage the electrode members even when the electrode members are placed in a mold and the magnetic core is pressure-molded, and it can provide an inductor with excellent solderability.

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PCT/JP2023/040235 2023-02-09 2023-11-08 インダクタおよびその製造方法 Ceased WO2024166469A1 (ja)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61186272U (https=) * 1985-05-10 1986-11-20
JPH0499807U (https=) * 1991-02-06 1992-08-28
JP2007165779A (ja) * 2005-12-16 2007-06-28 Sumida Corporation コイル封入型磁性部品

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61186272U (https=) * 1985-05-10 1986-11-20
JPH0499807U (https=) * 1991-02-06 1992-08-28
JP2007165779A (ja) * 2005-12-16 2007-06-28 Sumida Corporation コイル封入型磁性部品

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