EP1089302A1 - Substrate-mounted common mode choke coil and method of manufacture thereof - Google Patents
Substrate-mounted common mode choke coil and method of manufacture thereof Download PDFInfo
- Publication number
- EP1089302A1 EP1089302A1 EP00121450A EP00121450A EP1089302A1 EP 1089302 A1 EP1089302 A1 EP 1089302A1 EP 00121450 A EP00121450 A EP 00121450A EP 00121450 A EP00121450 A EP 00121450A EP 1089302 A1 EP1089302 A1 EP 1089302A1
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- European Patent Office
- Prior art keywords
- common mode
- conductive layer
- choke coil
- mode choke
- spiral conductive
- 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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- 238000004519 manufacturing process Methods 0.000 title claims description 15
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F17/0033—Printed inductances with the coil helically wound around a magnetic core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
-
- 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
- H01F41/041—Printed circuit coils
- H01F41/046—Printed circuit coils structurally combined with ferromagnetic material
-
- 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
- H01F17/045—Fixed inductances of the signal type with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F2017/0093—Common mode choke coil
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F37/00—Fixed inductances not covered by group H01F17/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a noise filter so as to restrain electromagnetic noise, and particularly to a substrate-mounted common mode choke coil and the method of manufacture thereof.
- Impedance elements generally shield frequency noise as impedance characteristics for the measures against EMI.
- Wound type and laminated type common mode choke coils are used as electromagnetic noise filters.
- the wound type is miniaturized by thinning wires or the like, thus increasing defects thereby. Additionally, pitch variations or the like causes errors in resonance frequencies and inductance, and the adjustments thereof are difficult. The manufacture thereof is also hard.
- a common mode choke coil which has first and second spiral conducive layer elements electrically insulated from each other at a base.
- the base is made of a magnetic or dielectric material. At least one of the first and the second spiral conductive layer elements is formed in close contact with the surface of the base.
- a method of manufacturing the above-mentioned common mode choke coils is characterized in that, after at least one conductive layer is formed on the surface of the base, two spiral conductors are formed by at least one processes of laser trimming, sandblast and water jet while the conductive layer is being removed to form grooves.
- a method of manufacturing the common mode choke coils mentioned above is obtained.
- the method is characterized in that, after forming two spiral conductive layers and an insulating layer by screen printing, a binder is removed and baking is carried out, thus forming the coil.
- a method of manufacturing any of the above-mentioned common mode choke coils is obtained.
- the method is characterized in that input and output terminals at a spiral conductive layer part, which is formed in close contact with the base, are formed by etching with a resist until a conductive layer constituting the spiral conductive layer part is exposed.
- a structure of a common mode choke coil according to the first example of the present invention will be explained based on the manufacturing processes thereof.
- a conductive material is coated on the surface of a prismatic base 10, made of a dielectric or magnetic material.
- the conductive material for use may be provided by plating, sputtering or depositing copper, aluminum, silver, or the like.
- the conductive material for use may also be provided by, after coating a conductive paste made of a conductive powder and a binder, removing the binder and then baking the paste.
- terminal parts 11 and 12 may be prismatic and a spiral conductive part 17 may be a polygonal pillar, cylinder or the like as explained later in the second example and the third example relating to Figs. 3A, 3B, 4A, and 4B.
- the edges may have R herein.
- spiral grooves 14a, 14b are formed on these base 10 in two stages by laser trimming, sandblast or water jet, thus forming two spiral conductive layer elements 15 and 16 alternately on the surface of the base 10.
- One of the spiral conductive layer elements will be referred to as a first spiral conductive layer element 15 and is illustrated by a hatched portion in Fig. 1.
- Another of the spiral conductive layer elements will be referred to as a second spiral conductive layer element 16 and is illustrated by non hatched portion in Fig. 1.
- the terminal parts 11 and 12 on both ends are divided into four terminals 20, 21, 22, and 23 by providing grooves 13.
- a common mode choke coil 1 is provided that has mutually insulated two spiral conductive layers of the first and the second spiral conductive layer elements 15 and 16 alternately.
- grooves 14a, 14b were formed in a spiral form by laser trimming.
- the base 10 was moved in a perpendicular direction to the laser, thus forming a groove 13 at the base terminal part 11 toward the corner of and in a longitudinal direction of the base.
- the base 10 was also rotated perpendicularly to the shifting direction.
- a first spiral conductive layer element 15 was formed in the base 10 thereby. The rotation was then stopped at the opposite terminal part 12 so as to cut the conductive layer.
- the base 10 was rotated by 90° or 180°, thus forming a second spiral conductive layer element 16 by laser trimming as described above.
- the insulating resin 24 was coated as in Fig. 2.
- Four terminals 20, 21, 22, and 23 were solder-plated, and both ends 18 and 19 at the terminals were cut off from the lines at both ends.
- the common mode choke coil was formed thereby that has the first and the second spiral conductive layer elements 15 and 16 insulated from each other alternately.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode.
- the impedance was 300 ⁇ at 500 MHz.
- a common mode choke coil of example 2 has the same structure as the common mode choke coil of example 1, except that the base has a different shape. Even if the spiral conductive part 17' of the base 30 is a polygonal pillar as shown in example 2, the coil may be formed as in examples 1 and 2.
- An impedance analyzer measured the impedance of the common mode choke coil of example 2 at a common mode. The impedance was 290 ⁇ at 500 MHz.
- a common mode choke coil of example 3 as shown in Figs. 4A and 4B has the same structure as the common mode choke coil of example 1, except that the base has a different shape. Even if the spiral conductive part 17 '' of a base 30 is cylindrical as shown in example 3, the coil may be formed as in example 1.
- An impedance analyzer measured the impedance of the common mode choke coil of example 3 at a common mode. The impedance was 250 ⁇ at 500 MHz.
- the spiral conductive part was formed by laser trimming in example 1, but was formed by sandblast instead in example 4.
- the same common mode choke coil as in example 1 was obtained.
- the spiral conductive part was formed by laser trimming in the common mode choke coil of example 1, but was formed by water jet instead in example 5. The same common mode choke coil as in example 1 was obtained.
- a common mode choke coil of example 6 of the present invention has the same structure as the common mode choke coil of example 1 shown in Figs. 1 and 2, except that a different insulator or the like is applied.
- the common mode choke coil of this example will be explained by referring to Figs. 1 and 2.
- a conductive material for use may be provided by plating, sputtering or depositing copper, aluminum, silver, or the like.
- the conductive material for use may also be provided by, after coating a conductive paste made of a conductive powder and a binder, removing the binder and then baking the paste.
- an insulating layer made of a dielectric or magnetic material is formed over double spiral electrodes 15 and 16 that are two alternately formed electrodes.
- This spiral conductive part 17 may be formed by laser trimming, sandblast, water jet, or the like.
- a resin 24 is formed by, on the surface of the spiral conductive part 17 of the base, coating and then drying a mixed resin, in which a soft magnetic material was added and then mixed with an insulating resin having a lower viscosity by dissolving it with a solvent or the like.
- a soft magnetic material and an organic binder are mixed, and the paste thereof is formed into a sheet by a doctor blade method, screen printing method, roll method, or the like. If no problems are found in the manufactured strength of the sheet, a coating insulating resin can be also used for the sheet.
- the common mode choke coil is formed that contains a soft magnetic material in an insulating resin.
- Epoxy resin was prepared by dissolving it with a solvent.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 580 ⁇ at 500 MHz.
- the same coil as in the first example was formed without mixing a magnetic material into an insulating resin.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode.
- the impedance was 300 ⁇ at 500 MHz.
- a multi-layer spiral common mode choke coil of example 7 of the present invention will be explained by referring to Figs. 5 and 6.
- a conductive material for use may be provided by plating, sputtering or depositing copper, aluminum, silver, or the like.
- the conductive material for use may also be provided by, after coating a conductive paste made of a conductive powder and a binder, removing the binder and then baking the paste.
- a spiral conductive part 28 has a structure of spiral conductive portion 28' as shown in Fig. 6, in which a second conductive layer element 27 is attached on a first conductor 25 through a dielectric or magnetic body 26 therebetween.
- This spiral conductive portion 28 may be formed by laser trimming, sandblast, water jet, or the like.
- a resin 35 is formed by, on the surface of the spiral conductive portion 28 of the base, coating and then drying a mixed resin, in which a soft magnetic material was added and then mixed with an insulating resin having a lower viscosity by dissolving it with a solvent or the like.
- a soft magnetic material and an organic binder are mixed, and the paste thereof is formed into a sheet by a doctor blade method, screen printing method, roll method, or the like. If no problems are found in the strength of the sheet, a coating insulating resin can also be used for the sheet.
- the common mode choke coil is formed that contains a soft magnetic material in an insulating resin.
- the same common mode choke coil as in example 6 was formed in example 7, except that the spiral conductive part has a double-layer structure.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode.
- the impedance was 630 ⁇ at 500 MHz.
- a common mode choke coil was made without mixing a magnetic material into an insulating resin.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode.
- the impedance was 320 ⁇ at 500 MHz.
- a common mode choke coil according to example 8 has the same structure as the common mode choke coil of example 1, except that the material of an insulating layer or the like is different. Thus, the coil of this example will be explained by referring to Fig. 1.
- PVB was added to Ni-Zn ferrite powder at 5 wt. % relative to the powder, and a mixed solvent of ethyl cellosolve and buthyl carbinol was added thereto, which was subsequently kneaded by a planetary mixer.
- This paste was formed into a sheet form at 10 microns by a doctor blade method. This sheet was cut into an appropriate size, and was wound around the spiral conductive part 17 after coating epoxy resin over the surface.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode.
- the impedance was 580 ⁇ at 500 MHz.
- a common mode choke coil was made without mixing a magnetic material into an insulating resin.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode.
- the impedance was 300 ⁇ at 500 MHz.
- the base was cylindrical at both ends and at the center in example 6 to example 8 described above, the polygonal pillar base shown in Figs. 3 and the cylindrical base shown in Figs. 4 may be used.
- the spiral conductive part of a base being either a polygonal pillar or a cylinder, the same effects may be clearly obtained. Moreover, even with a different soft magnetic material or insulating resin, the same effects may be obtained.
- a first conductive layer element 41 is coated on a prismatic base made of a dielectric or magnetic material.
- a conductor in use may be provided by soldering, sputtering or depositing copper, aluminum, silver, or the like.
- the conductor for use may also be provided by, after coating a conductive paste made of a conductive powder and a binder, removing the binder and then baking the paste.
- a second conductive layer element 43 is coated on the surface of this first conductive layer element 41 through an insulating layer 42.
- the insulating layer 42 and the second conductive layer element 43 may be formed like the first conductive layer element 41.
- a spiral groove 44 is formed as illustrated by a black thick line in Fig. 8. Laser trimming, or sandblast or water jet forms this groove 44.
- a portion of electrodes 45 and 46 is etched down to the first conductive layer 41, thus forming terminals 48 and 49 as illustrated by hatched portions.
- the terminal parts 45 and 46 may be prismatic, and a spiral conductive part 47 may be a polygonal pillar, cylinder, or the like.
- the edges may have R.
- an insulating resin 24 is coated over the entire surface of the conductive layer between the terminal parts, and four electrodes 51, 52, 53 and 54 are solder-plated. Accordingly, the common mode choke coil is formed that has the first and the second spiral conductive layer elements 41 and 43 insulated from each other.
- the terminal parts 45 and 46 may be prismatic, and the spiral conductive part 47 may be a polygonal pillar, cylinder, or the like.
- the above-noted paste of a conductive powder and a binder is printed by screen printing onto the base so as to form two spiral conductive layer elements 41 and 43 and the insulating layer 42.
- the binder is removed, and the paste is baked, thus forming the common mode choke coil.
- the common mode choke coil 3 is formed that has two mutually insulating spiral conductive layers 41 and 43.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode.
- the impedance was 300 ⁇ at 500 MHz.
- a common mode choke coil of example 10 has the same structure as the common mode choke coil of the ninth example, except that the spiral conductive part of the base is a polygonal pillar.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 300 ⁇ at 500 MHz.
- a common mode choke coil of example 11 as shown in Figs. 4a and 4b has the same structure as the common mode choke coil of example 9, except that the spiral conductive part of the base 30 is cylindrical.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode.
- the impedance was 290 Q at 500 MHz.
- the groove 44 is formed to make the spiral conductive portion 47' with laser trimming.
- a common mode choke coil was made by sandblast. The same results as in example 9 were also obtained in example 12.
- the spiral conductive part was formed by laser trimming.
- a common mode choke coil was made by water jet. The same results as in example 9 were also obtained in example 13.
- spiral grooves may be formed by sandblast or water jet when the spiral conductive part of the base is a polygonal pillar or a cylinder. Clearly, similar results can be obtained.
- a conductive paste was prepared by using a mixed solvent of ethyl cellosolve and butyl carbinol, copper powder and PVB. In this case, the ratio of copper powder to PVD was 95:5.
- an alumina layer was printed on the surface of the first conductor and was then dried, thus printing and drying a second conductor.
- the alumina paste has the same composition as the copper paste. After the second conductor was dried, a binder was removed and the paste was baked.
- a common mode choke coil is formed by coating the insulating resin 55 and solder plating the terminal parts.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode.
- the impedance was 300 ⁇ at 500 MHz.
- a base made of a magnetic or dielectric body has two mutually electrically insulated spiral conductors, and the conductive layer thereof is trimmed by laser or the like.
- the common mode choke coil may be easily and economically provided that has high Q-characteristics and little fluctuation of resonance frequencies and inductance.
- binding increases by mixing a magnetic material to an insulating resin, so that the common mode choke coil may be easily and economically provided that has high impedance at a common mode in a high frequency range.
- a base made of a magnetic or dielectric material has two mutually electrically insulated laminated spiral conductors.
- the conductive layers are formed by trimming with laser or the like or screen printing, so that the common mode choke coil may be easily and economically provided that has high Q-characteristics and little fluctuation of resonance frequencies and inductance.
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Abstract
Description
- The present invention relates to a noise filter so as to restrain electromagnetic noise, and particularly to a substrate-mounted common mode choke coil and the method of manufacture thereof.
- As electric equipment is reduced in size and has increased handling frequencies, the importance of measures against EMI (Electromagnetic Interference) has been increasing. Impedance elements generally shield frequency noise as impedance characteristics for the measures against EMI.
- Wound type and laminated type common mode choke coils are used as electromagnetic noise filters.
- The wound type is miniaturized by thinning wires or the like, thus increasing defects thereby. Additionally, pitch variations or the like causes errors in resonance frequencies and inductance, and the adjustments thereof are difficult. The manufacture thereof is also hard.
- Moreover, in case of the laminated type, patterns have been predetermined, thereby causing errors in inductance due to the fluctuation in thickness or the like. Also, the manufacture thereof is difficult because of the laminated structure.
- It is an object of the present invention to easily and economically provide, in common mode choke coils having two mutually electrically insulated spiral conductors at a base, the common mode choke coil that has high Q-characteristics and little fluctuation of resonance frequencies and inductance.
- It is another object of the present invention to easily and economically provide, in common mode choke coils having two mutually electrically insulated spiral conductors at a base, the common mode choke coil that has high impedance at a common mode and little fluctuation of resonance frequencies and inductance.
- It is still another object of the present invention to provide the method of manufacturing the common mode choke coils described above.
- According to an aspect of the present invention, there is provided a common mode choke coil which has first and second spiral conducive layer elements electrically insulated from each other at a base. The base is made of a magnetic or dielectric material. At least one of the first and the second spiral conductive layer elements is formed in close contact with the surface of the base.
- According to another aspect of the present invention, there is provided a method of manufacturing the above-mentioned common mode choke coils. The method is characterized in that, after at least one conductive layer is formed on the surface of the base, two spiral conductors are formed by at least one processes of laser trimming, sandblast and water jet while the conductive layer is being removed to form grooves.
- Moreover, according to still another aspect of the present invention, there is provided a method of manufacturing the common mode choke coils mentioned above is obtained. The method is characterized in that, after forming two spiral conductive layers and an insulating layer by screen printing, a binder is removed and baking is carried out, thus forming the coil.
- Furthermore, according to yet another aspect of the present invention, there is provided a method of manufacturing any of the above-mentioned common mode choke coils is obtained. The method is characterized in that input and output terminals at a spiral conductive layer part, which is formed in close contact with the base, are formed by etching with a resist until a conductive layer constituting the spiral conductive layer part is exposed.
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- Fig. 1 is a front view for use in explaining a common mode choke coil according to a first example of the present invention;
- Fig. 2 is a view for use in explaining an end product of the common mode choke coil of Fig. 1;
- Fig. 3A is a front view of a base of a common mode choke coil according to a second example of the present invention;
- Fig. 3B is a side view of the base of Fig. 3A;
- Fig. 4A is a front view of a base of a common mode choke coil according to a third example of the present invention;
- Fig. 4B is a side view of the base of Fig. 4A;
- Fig. 5 is a figure for use in explaining a double-layer spiral common mode choke coil of a sixth example of the present invention;
- Fig. 6 is a figure for use in explaining a cross section of the double-layer spiral conductive part of Fig. 5;
- Fig. 7 is a view for use in explaining an end product of the common mode choke coil of Fig. 5;
- Fig. 8 is a perspective view for use in explaining the common mode choke coil according to a ninth example of the present invention;
- Fig. 9 is a figure for use in explaining a cross section of a spiral conductive part of the common mode choke coil of Fig. 8; and
- Fig. 10 is a figure for use in explaining an end product of the common mode choke coil of Fig. 8.
-
- With reference to Fig. 1 and Fig. 2, a structure of a common mode choke coil according to the first example of the present invention will be explained based on the manufacturing processes thereof.
- A conductive material is coated on the surface of a
prismatic base 10, made of a dielectric or magnetic material. The conductive material for use may be provided by plating, sputtering or depositing copper, aluminum, silver, or the like. - The conductive material for use may also be provided by, after coating a conductive paste made of a conductive powder and a binder, removing the binder and then baking the paste.
- Regarding the shape of the
base 10,terminal parts conductive part 17 may be a polygonal pillar, cylinder or the like as explained later in the second example and the third example relating to Figs. 3A, 3B, 4A, and 4B. - In case of the prismatic shape, the edges may have R herein. As illustrated by a thick black line in Fig. 1,
spiral grooves base 10 in two stages by laser trimming, sandblast or water jet, thus forming two spiralconductive layer elements base 10. One of the spiral conductive layer elements will be referred to as a first spiralconductive layer element 15 and is illustrated by a hatched portion in Fig. 1. Another of the spiral conductive layer elements will be referred to as a second spiralconductive layer element 16 and is illustrated by non hatched portion in Fig. 1. - The
terminal parts terminals grooves 13. - Referring to Fig. 2, an
insulating resin 24 is coated over an entire surface of the spiralconductive part 17 between theterminal parts terminals ends conductive layer elements - Subsequently, the manufacture of the common mode choke coil according to example 1 of the present invention will be explained in further detail.
- A conductive layer was formed by plating copper at 15 microns on a 1.6 × 1.0 × 1.0
mm prism base 10 made of a magnetic material having µ = 30. On thisplated base 10,grooves base 10 was moved in a perpendicular direction to the laser, thus forming agroove 13 at thebase terminal part 11 toward the corner of and in a longitudinal direction of the base. Subsequently, as thebase 10 was being shifted, it was also rotated perpendicularly to the shifting direction. A first spiralconductive layer element 15 was formed in thebase 10 thereby. The rotation was then stopped at the oppositeterminal part 12 so as to cut the conductive layer. After the cut, thebase 10 was rotated by 90° or 180°, thus forming a second spiralconductive layer element 16 by laser trimming as described above. Over the entire surface of the spiralconductive part 17 between theterminal parts resin 24 was coated as in Fig. 2. Fourterminals conductive layer elements - An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 300 Ω at 500 MHz.
- Referring to Figs. 3A and 3B, a common mode choke coil of example 2 has the same structure as the common mode choke coil of example 1, except that the base has a different shape. Even if the spiral conductive part 17' of the
base 30 is a polygonal pillar as shown in example 2, the coil may be formed as in examples 1 and 2. An impedance analyzer measured the impedance of the common mode choke coil of example 2 at a common mode. The impedance was 290 Ω at 500 MHz. - A common mode choke coil of example 3 as shown in Figs. 4A and 4B has the same structure as the common mode choke coil of example 1, except that the base has a different shape. Even if the spiral conductive part 17'' of a
base 30 - The spiral conductive part was formed by laser trimming in example 1, but was formed by sandblast instead in example 4. The same common mode choke coil as in example 1 was obtained.
- The spiral conductive part was formed by laser trimming in the common mode choke coil of example 1, but was formed by water jet instead in example 5. The same common mode choke coil as in example 1 was obtained.
- In examples 5 and 6, the same base as in example 1 was used. However, when the spiral conductive part of a base is a polygonal pillar or a cylinder as in Figs. 3A, 3B or 4A, 4B as alternative examples, spiral grooves may be formed by sandblast or water jet. Clearly, the same effects can be obtained.
- A common mode choke coil of example 6 of the present invention has the same structure as the common mode choke coil of example 1 shown in Figs. 1 and 2, except that a different insulator or the like is applied. Thus, the common mode choke coil of this example will be explained by referring to Figs. 1 and 2.
- In reference to Figs. 1 and 2, at a base 10 made of a dielectric or magnetic material, mutually insulated spiral electrodes are formed in close contact with the
base 10. A conductive material for use may be provided by plating, sputtering or depositing copper, aluminum, silver, or the like. The conductive material for use may also be provided by, after coating a conductive paste made of a conductive powder and a binder, removing the binder and then baking the paste. - For this spiral
conductive part 17, as shown in Fig. 1, an insulating layer made of a dielectric or magnetic material is formed overdouble spiral electrodes - This spiral
conductive part 17 may be formed by laser trimming, sandblast, water jet, or the like. - In reference to Fig. 2, a
resin 24 is formed by, on the surface of the spiralconductive part 17 of the base, coating and then drying a mixed resin, in which a soft magnetic material was added and then mixed with an insulating resin having a lower viscosity by dissolving it with a solvent or the like. A soft magnetic material and an organic binder are mixed, and the paste thereof is formed into a sheet by a doctor blade method, screen printing method, roll method, or the like. If no problems are found in the manufactured strength of the sheet, a coating insulating resin can be also used for the sheet. - An insulating resin is coated on this sheet, and the sheet is wound around the surface of the spiral
conductive part 17, thus forming theresin 24. By these methods, the common mode choke coil is formed that contains a soft magnetic material in an insulating resin. - Subsequently, the manufacture of the common mode choke coil of example 6 of the present invention will be explained in detail.
- A conductive layer was formed by plating copper at 15 microns on a 1.6 × 1.0 × 1.0
mm prism base 10, made of Ni-Zn ferrite having µbase 10, six 20-micronwide groove 14a is formed in a spiral form by laser trimming. Similarly, the second spiralconductive layer elements 15 was formed by laser trimming. - Epoxy resin was prepared by dissolving it with a solvent. A slurry was prepared by mixing the epoxy resin so as to contain the Ni-Zn ferrite powder, having µ
conductive part 17, and was dried in the open air as insulatingresin 24 in Fig. 2. Solder plating was carried out on fourterminals - For reference, in the same method as above, the same coil as in the first example was formed without mixing a magnetic material into an insulating resin. An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 300 Ω at 500 MHz.
- A multi-layer spiral common mode choke coil of example 7 of the present invention will be explained by referring to Figs. 5 and 6.
- At a
base 10 made of a dielectric or magnetic material, mutually insulated spiral electrodes are formed in close contact with thebase 10. A conductive material for use may be provided by plating, sputtering or depositing copper, aluminum, silver, or the like. The conductive material for use may also be provided by, after coating a conductive paste made of a conductive powder and a binder, removing the binder and then baking the paste. - A spiral
conductive part 28 has a structure of spiral conductive portion 28' as shown in Fig. 6, in which a secondconductive layer element 27 is attached on afirst conductor 25 through a dielectric ormagnetic body 26 therebetween. - This spiral
conductive portion 28 - In reference to Fig. 5, a
resin 35 is formed by, on the surface of the spiralconductive portion 28 - An insulating resin is coated on this sheet, and the sheet is wound around the surface of the spiral
conductive part 28resin 35. By these methods, the common mode choke coil is formed that contains a soft magnetic material in an insulating resin. - The same common mode choke coil as in example 6 was formed in example 7, except that the spiral conductive part has a double-layer structure.
- An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 630 Ω at 500 MHz.
- In the same method, a common mode choke coil was made without mixing a magnetic material into an insulating resin. An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 320 Ω at 500 MHz.
- A common mode choke coil according to example 8 has the same structure as the common mode choke coil of example 1, except that the material of an insulating layer or the like is different. Thus, the coil of this example will be explained by referring to Fig. 1.
- PVB was added to Ni-Zn ferrite powder at 5 wt. % relative to the powder, and a mixed solvent of ethyl cellosolve and buthyl carbinol was added thereto, which was subsequently kneaded by a planetary mixer. This paste was formed into a sheet form at 10 microns by a doctor blade method. This sheet was cut into an appropriate size, and was wound around the spiral
conductive part 17 after coating epoxy resin over the surface. - An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 580 Ω at 500 MHz.
- In the same method, a common mode choke coil was made without mixing a magnetic material into an insulating resin. An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 300 Ω at 500 MHz.
- Although the base was cylindrical at both ends and at the center in example 6 to example 8 described above, the polygonal pillar base shown in Figs. 3 and the cylindrical base shown in Figs. 4 may be used. In case of the spiral conductive part of a base being either a polygonal pillar or a cylinder, the same effects may be clearly obtained. Moreover, even with a different soft magnetic material or insulating resin, the same effects may be obtained.
- Referring to Figs. 8 and 9, a first
conductive layer element 41 is coated on a prismatic base made of a dielectric or magnetic material. A conductor in use may be provided by soldering, sputtering or depositing copper, aluminum, silver, or the like. The conductor for use may also be provided by, after coating a conductive paste made of a conductive powder and a binder, removing the binder and then baking the paste. - A second
conductive layer element 43 is coated on the surface of this firstconductive layer element 41 through an insulatinglayer 42. The insulatinglayer 42 and the secondconductive layer element 43 may be formed like the firstconductive layer element 41. In this base, aspiral groove 44 is formed as illustrated by a black thick line in Fig. 8. Laser trimming, or sandblast or water jet forms thisgroove 44. Subsequently, a portion ofelectrodes conductive layer 41, thus formingterminals base 40, theterminal parts conductive part 47 may be a polygonal pillar, cylinder, or the like. In case of the prismatic shape, the edges may have R. As in Fig. 10, an insulatingresin 24 is coated over the entire surface of the conductive layer between the terminal parts, and fourelectrodes conductive layer elements base 40, theterminal parts conductive part 47 may be a polygonal pillar, cylinder, or the like. - Moreover, as another method, the above-noted paste of a conductive powder and a binder is printed by screen printing onto the base so as to form two spiral
conductive layer elements layer 42. The binder is removed, and the paste is baked, thus forming the common mode choke coil. - Subsequently, the manufacture of the common mode choke coil of the example 6 of the present invention will be explained.
- Copper was plated at 15 microns on a 1.6 × 1.0 × 1.0
mm prism base 40 made of a magnetic body having µbase 40, furthermore, alumina was plated at 15 microns and copper was then plated at 15 microns as shown in Fig. 9. Agroove 44 was formed in thisbase 40 by laser trimming. Thegroove 44 is formed in a spiral form by shifting the base 40 in the perpendicular direction to the rotation of the base 40 while rotating thebase 40. Subsequently, a portion of theelectrodes conductive layer 41, thus forming theterminals terminal parts resin 55 was coated as in Fig. 10. Fourterminals terminals mode choke coil 3 is formed that has two mutually insulating spiralconductive layers - An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 300 Ω at 500 MHz.
- Referring to Figs. 3a and 3b, a common mode choke coil of example 10 has the same structure as the common mode choke coil of the ninth example, except that the spiral conductive part of the base is a polygonal pillar. An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 300 Ω at 500 MHz.
- Accordingly, the same results as in example 9 were obtained in example 10.
- A common mode choke coil of example 11 as shown in Figs. 4a and 4b has the same structure as the common mode choke coil of example 9, except that the spiral conductive part of the
base 30 is cylindrical. - An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 290 Q at 500 MHz.
- Accordingly, the same results as in example 9 were obtained in example 11.
- In the common mode choke coil shown in example 9, the
groove 44 is formed to make the spiral conductive portion 47' with laser trimming. However, in example 12, a common mode choke coil was made by sandblast. The same results as in example 9 were also obtained in example 12. - In the common mode choke coil shown in example 9, the spiral conductive part was formed by laser trimming. However, in example 13, a common mode choke coil was made by water jet. The same results as in example 9 were also obtained in example 13.
- As an alternative example of example 13, moreover, spiral grooves may be formed by sandblast or water jet when the spiral conductive part of the base is a polygonal pillar or a cylinder. Clearly, similar results can be obtained.
- A conductive paste was prepared by using a mixed solvent of ethyl cellosolve and butyl carbinol, copper powder and PVB. In this case, the ratio of copper powder to PVD was 95:5. This paste was printed on a 1.6 × 1.0 × 1.0 mm prismatic base, made of a magnetic body having µ
resin 55 and solder plating the terminal parts. - An impedance analyzer measured the impedance of this common mode choke coil at a common mode. The impedance was 300 Ω at 500 MHz.
- Even when the spiral conductive part of the base is a polygonal pillar or a cylinder as an alternative example of example 14, the same results may be clearly obtained.
- As explained above, in the examples of the present invention, a base made of a magnetic or dielectric body has two mutually electrically insulated spiral conductors, and the conductive layer thereof is trimmed by laser or the like. Thus, the common mode choke coil may be easily and economically provided that has high Q-characteristics and little fluctuation of resonance frequencies and inductance.
- Moreover, according to the examples of the present invention, binding increases by mixing a magnetic material to an insulating resin, so that the common mode choke coil may be easily and economically provided that has high impedance at a common mode in a high frequency range.
- Furthermore, according to the examples of the present invention, a base made of a magnetic or dielectric material has two mutually electrically insulated laminated spiral conductors. The conductive layers are formed by trimming with laser or the like or screen printing, so that the common mode choke coil may be easily and economically provided that has high Q-characteristics and little fluctuation of resonance frequencies and inductance.
Claims (21)
- A common mode choke coil comprising first and second spiral conductive layer elements electrically insulated from each other at a base, said base consisting of a magnetic material or a dielectric material, wherein at least one of the first and the second spiral conductive layer elements is formed in contact with a surface of the base.
- The common mode choke coil according to claim 1, wherein said base has a spiral conductive layer part comprises the first and the second spiral conductive layer elements alternately wound in a longitudinal direction of said spiral conductive layer part and having roughly an identical electric length, both of the first and the second spiral conductive layer elements being formed in contact with a surface of the base.
- The common mode choke coil according to claim 1, wherein the first and the second conductive layer elements are formed by winding and laminating two spiral conductive layer elements having roughly an identical electric length, one of the first and second spiral conductive layer elements being attached to another spiral conductive layer element through an insulating layer.
- The common mode choke coil according to claim 1, wherein at least one of the first and the second spiral conductive layer elements is covered by an insulating layer at its surface, the insulating layer being formed of an insulating resin containing a soft magnetic powder.
- The common mode choke coil according to claim 1, wherein at least one of the first and the second spiral conductive layer elements is covered by an insulating layer at its surface, the insulating layer being formed of only an insulating resin.
- The common mode choke coil according to claim 3, wherein the insulating layer is formed between the first and the second spiral conductive elements by winding an insulating resin sheet, said resin sheet containing an organic binder and a soft magnetic powder.
- The common mode choke coil according to claim 1, wherein each of the first and the second spiral conductive layer elements has an input terminal and an output terminal at both of ends thereof, respectively.
- The common mode choke coil according to claim 1, wherein said at least one of first and second spiral conductive layer portions is provided by plating, sputtering or depositing.
- The common mode choke coil according to claim 1, wherein said at least one of first and second spiral conductive layer elements is formed by coating a conductive paste consisting of a conductive powder and a binder, thereafter removing the binder, and then baking the paste.
- The common mode choke coil according to claim 1, wherein the base has a rotation-symmetrical pillar shape.
- The common mode choke coil according to claim 9, wherein the base has a prismatic shape.
- The common mode choke coil according to claim 1, wherein the base has prismatic terminal parts at both ends, and a spiral conductive layer part between both ends, said spiral conductive layer part having a shape of a rotation-symmetrical polygonal pillar or cylinder.
- The common mode choke coil according to claim 1, wherein electrodes are formed for terminals at both ends of the base.
- The common mode choke coil according to claim 13, said electrodes are divided to form four terminals.
- The common mode choke coil according to claim 3, wherein the insulating layer has internal resistance of 108Ω·m or more.
- The common mode choke coil according to claim 3, wherein the insulating layer between two conductors has internal resistance of 108Ω·m or more.
- The common mode choke coil according to claim 3, wherein the insulating layer is provided between the first and the second spiral conductive layer elements by coating an insulating paste consisting of an insulating powder and a binder, thereafter removing the binder ,and then baking the paste.
- The common mode choke coil according to claim 1, wherein said at least one of the first and the second spiral conductive layer elements has a terminal formed by etching with a resist.
- A method of manufacturing a common mode choke coil comprising first and second spiral conductive layer elements electrically insulated from each other at a base made of a magnetic material or a dielectric material, at least one of the first and the second spiral conductive layer elements being formed in contact with a surface of the base, the method comprising the steps of:forming at least one conductive layer on the surface of the base; andforming two spiral conductors by at least one process of laser trimming, water jet and sandblast while grooves are formed by removing said conductive layer.
- A method of manufacturing a common mode choke coil comprising first and second spiral conductive layer elements electrically insulated from each other at a base made of a magnetic material or a dielectric material, at least one of the first and the second spiral conductive layer elements being formed in contact with a surface of the base, wherein the first and the second spiral conductive layer elements and an insulating layer are formed by removing a binder and then baking after being printed in screen printing.
- A method of manufacturing a common mode choke coil comprising first and second spiral conductive layer elements electrically insulated from each other at a base made of a magnetic material or a dielectric material, at least one of the first and the second spiral conductive layer elements being formed in contact with a surface of the base, wherein at least one of the first and the second spiral conductive layer elements has input and output terminals at both of the end formed by etching with a resist until a conductive layer constituting the spiral conductive layer is exposed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03012309A EP1347473A1 (en) | 1999-09-30 | 2000-09-29 | Substrate-mounted common mode choke coil and method of manufacture thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28007999 | 1999-09-30 | ||
JP28007999A JP2001102222A (en) | 1999-09-30 | 1999-09-30 | Common mode choke coil and manufacturing method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1089302A1 true EP1089302A1 (en) | 2001-04-04 |
Family
ID=17620027
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03012309A Withdrawn EP1347473A1 (en) | 1999-09-30 | 2000-09-29 | Substrate-mounted common mode choke coil and method of manufacture thereof |
EP00121450A Withdrawn EP1089302A1 (en) | 1999-09-30 | 2000-09-29 | Substrate-mounted common mode choke coil and method of manufacture thereof |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03012309A Withdrawn EP1347473A1 (en) | 1999-09-30 | 2000-09-29 | Substrate-mounted common mode choke coil and method of manufacture thereof |
Country Status (6)
Country | Link |
---|---|
EP (2) | EP1347473A1 (en) |
JP (1) | JP2001102222A (en) |
KR (1) | KR20010067263A (en) |
CN (1) | CN1199205C (en) |
SG (1) | SG96573A1 (en) |
TW (1) | TW508597B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003005579A1 (en) * | 2001-07-04 | 2003-01-16 | Koninklijke Philips Electronics N.V. | Electronic inductive and capacitive component |
WO2021183666A1 (en) * | 2020-03-13 | 2021-09-16 | Cirrus Logic International Semiconductor Ltd. | Layered process-constructed double-winding embedded solenoid inductor |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8106739B2 (en) | 2007-06-12 | 2012-01-31 | Advanced Magnetic Solutions United | Magnetic induction devices and methods for producing them |
JP5121606B2 (en) * | 2008-07-09 | 2013-01-16 | 東京特殊電線株式会社 | Spiral coil |
KR101630090B1 (en) * | 2014-12-24 | 2016-06-13 | 삼성전기주식회사 | Multilayered electronic component and manufacturing method thereof |
TWI592956B (en) | 2015-06-25 | 2017-07-21 | Wafer Mems Co Ltd | Core inductor production methods |
TWI555044B (en) * | 2015-06-25 | 2016-10-21 | Wafer Mems Co Ltd | A method for producing a passive element with a terminal electrode |
TWI592955B (en) * | 2015-06-25 | 2017-07-21 | Wafer Mems Co Ltd | Embedded passive components and methods of mass production |
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EP0698896A1 (en) * | 1994-08-24 | 1996-02-28 | Yokogawa Electric Corporation | Printed coil |
JPH08335517A (en) * | 1995-04-03 | 1996-12-17 | Murata Mfg Co Ltd | Lamination common mode choke coil |
EP0778593A1 (en) * | 1995-12-07 | 1997-06-11 | Co.Ri.M.Me. Consorzio Per La Ricerca Sulla Microelettronica Nel Mezzogiorno | Method for realizing magnetic circuits in an integrated circuit |
US5692290A (en) * | 1994-09-19 | 1997-12-02 | Taiyo Yuden Kabushiki Kaisha | Method of manufacturing a chip inductor |
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FR2763739A3 (en) * | 1997-05-23 | 1998-11-27 | Frontier Electonics Co Ltd | Improved laser manufacture method for inductors |
JPH11238634A (en) * | 1997-12-17 | 1999-08-31 | Taiyo Yuden Co Ltd | Planar mounting type coil component |
EP1077455A2 (en) * | 1999-08-19 | 2001-02-21 | Murata Manufacturing Co., Ltd. | Coil component |
-
1999
- 1999-09-30 JP JP28007999A patent/JP2001102222A/en not_active Withdrawn
-
2000
- 2000-09-29 SG SG200005601A patent/SG96573A1/en unknown
- 2000-09-29 EP EP03012309A patent/EP1347473A1/en not_active Withdrawn
- 2000-09-29 EP EP00121450A patent/EP1089302A1/en not_active Withdrawn
- 2000-09-29 CN CNB001290622A patent/CN1199205C/en not_active Expired - Fee Related
- 2000-09-29 KR KR1020000057387A patent/KR20010067263A/en active IP Right Grant
- 2000-09-30 TW TW089120390A patent/TW508597B/en not_active IP Right Cessation
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DE888271C (en) * | 1942-04-10 | 1953-08-31 | Siemens Ag | Interference protection choke |
JPH02256214A (en) * | 1988-06-09 | 1990-10-17 | Tokin Corp | Chip inductor and its manufacture |
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US5692290A (en) * | 1994-09-19 | 1997-12-02 | Taiyo Yuden Kabushiki Kaisha | Method of manufacturing a chip inductor |
JPH08335517A (en) * | 1995-04-03 | 1996-12-17 | Murata Mfg Co Ltd | Lamination common mode choke coil |
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GB2318218A (en) * | 1996-10-11 | 1998-04-15 | Matsushita Electric Ind Co Ltd | Inductive device |
FR2763739A3 (en) * | 1997-05-23 | 1998-11-27 | Frontier Electonics Co Ltd | Improved laser manufacture method for inductors |
JPH11238634A (en) * | 1997-12-17 | 1999-08-31 | Taiyo Yuden Co Ltd | Planar mounting type coil component |
EP1077455A2 (en) * | 1999-08-19 | 2001-02-21 | Murata Manufacturing Co., Ltd. | Coil component |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003005579A1 (en) * | 2001-07-04 | 2003-01-16 | Koninklijke Philips Electronics N.V. | Electronic inductive and capacitive component |
WO2021183666A1 (en) * | 2020-03-13 | 2021-09-16 | Cirrus Logic International Semiconductor Ltd. | Layered process-constructed double-winding embedded solenoid inductor |
GB2607801A (en) * | 2020-03-13 | 2022-12-14 | Cirrus Logic Int Semiconductor Ltd | Layered process-constructed double-winding embedded solenoid inductor |
US11881343B2 (en) | 2020-03-13 | 2024-01-23 | Cirrus Logic, Inc. | Layered process-constructed double-winding embedded solenoid inductor |
Also Published As
Publication number | Publication date |
---|---|
SG96573A1 (en) | 2003-06-16 |
KR20010067263A (en) | 2001-07-12 |
EP1347473A1 (en) | 2003-09-24 |
TW508597B (en) | 2002-11-01 |
CN1290947A (en) | 2001-04-11 |
JP2001102222A (en) | 2001-04-13 |
CN1199205C (en) | 2005-04-27 |
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