WO2023032671A1 - プリント配線板 - Google Patents
プリント配線板 Download PDFInfo
- Publication number
- WO2023032671A1 WO2023032671A1 PCT/JP2022/031070 JP2022031070W WO2023032671A1 WO 2023032671 A1 WO2023032671 A1 WO 2023032671A1 JP 2022031070 W JP2022031070 W JP 2022031070W WO 2023032671 A1 WO2023032671 A1 WO 2023032671A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coil
- coil wiring
- wiring
- main surface
- wiring board
- Prior art date
Links
- 238000009713 electroplating Methods 0.000 description 40
- 238000005530 etching Methods 0.000 description 24
- 238000000034 method Methods 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000007772 electroless plating Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- XEMZLVDIUVCKGL-UHFFFAOYSA-N hydrogen peroxide;sulfuric acid Chemical compound OO.OS(O)(=O)=O XEMZLVDIUVCKGL-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/003—Printed circuit coils
-
- 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
- H01F17/0013—Printed inductances with stacked layers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F2007/068—Electromagnets; Actuators including electromagnets using printed circuit coils
Definitions
- Patent Document 1 Japanese Patent Application Laid-Open No. 2016-9854
- Patent Document 1 Japanese Patent Application Laid-Open No. 2016-9854
- the printed wiring board described in Patent Document 1 has a base film and wiring.
- the base film has a first major surface and a second major surface opposite to the first major surface.
- the wiring has a first wiring arranged on the first main surface and a second wiring arranged on the second main surface.
- the first wiring and the second wiring are electrically connected to each other via a plating layer arranged on the inner wall surface of the through hole formed in the base film.
- the first wiring and the second wiring constitute a coil by being spirally wound.
- the printed wiring board of the present disclosure includes a base film having a main surface, coil wiring formed on the main surface, first connection lands and second connection lands connected to one end and the other end of the coil wiring. and
- the major surface has a first major surface and a second major surface opposite to the first major surface.
- the coil wiring is formed in a spiral shape on the first main surface and in a spiral shape on the second main surface, and is electrically connected to the first coil wiring. and a second coil wiring.
- the first connection land and the second connection land are formed on the second main surface. The number of turns of the first coil wiring is greater than the number of turns of the second coil wiring.
- FIG. 1 is a plan view of a printed wiring board 100.
- FIG. FIG. 2 is a bottom view of printed wiring board 100 .
- FIG. 3 is a cross-sectional view along III-III in FIG.
- FIG. 4 is a cross-sectional view along IV-IV in FIG.
- FIG. 5 is a cross-sectional view taken along line VV of FIG.
- FIG. 6 is a schematic diagram of an actuator using the printed wiring board 100.
- FIG. 7A to 7D are process diagrams showing a method for manufacturing printed wiring board 100.
- FIG. 8 is a cross-sectional view for explaining the seed layer forming step S2.
- FIG. 9 is a cross-sectional view for explaining the resist forming step S3.
- FIG. 10 is a cross-sectional view for explaining the first electroplating step S4.
- FIG. 11 is a cross-sectional view for explaining the resist removing step S5.
- FIG. 12 is a cross-sectional view for explaining the etching step S6.
- the present disclosure has been made in view of the problems of the prior art as described above.
- the present disclosure provides a printed wiring board capable of reducing the thickness of the coil device.
- a printed wiring board includes a base film having a main surface, coil wiring formed on the main surface, and first connection lands and second connection lands connected to one end and the other end of the coil wiring. and
- the major surface has a first major surface and a second major surface opposite to the first major surface.
- the coil wiring is formed in a spiral shape on the first main surface and in a spiral shape on the second main surface, and is electrically connected to the first coil wiring. and a second coil wiring.
- the first connection land and the second connection land are formed on the second main surface. The number of turns of the first coil wiring is greater than the number of turns of the second coil wiring.
- the number of turns of the first coil wiring may be 1.1 times or more and 4.3 times or less of the number of turns of the second coil wiring.
- the first coil wiring may be longer than the second coil wiring.
- the area ratio of the first coil wiring may be larger than the area ratio of the second coil wiring.
- the length of the first coil wiring may be 1.1 to 3.0 times the length of the second coil wiring.
- the area ratio of the first coil wiring may be 1.1 to 2.5 times the area ratio of the second coil wiring.
- the printed wiring boards of (1) to (6) above may be arranged such that the first main surface faces the magnet.
- the interval between two portions of the adjacent coil wiring may be 20 ⁇ m or less.
- the coil device Since the number of turns (length, area ratio) of the first coil wiring and the number of turns (length, area ratio) of the second coil wiring can be improved, the coil device It is possible to secure the thrust of the coil device while reducing the thickness of the coil device.
- printed wiring board 100 (Structure of Printed Wiring Board According to Embodiment) The configuration of the printed wiring board (referred to as “printed wiring board 100”) according to the embodiment will be described below.
- FIG. 1 is a plan view of the printed wiring board 100.
- FIG. FIG. 2 is a bottom view of printed wiring board 100 .
- FIG. 2 shows printed wiring board 100 viewed from the opposite side of FIG.
- FIG. 3 is a cross-sectional view along III-III in FIG.
- FIG. 4 is a cross-sectional view along IV-IV in FIG.
- FIG. 5 is a cross-sectional view taken along line VV of FIG.
- printed wiring board 100 has base film 10 , coil wiring 20 , first connection land 30 and second connection land 40 .
- Printed wiring board 100 functions as a coil device.
- the base film 10 has a first main surface 10a and a second main surface 10b.
- the first main surface 10a and the second main surface 10b form end surfaces of the base film 10 in the thickness direction.
- the second principal surface 10b is the opposite surface of the first principal surface 10a.
- the base film 10 is made of a flexible insulating material. Specific examples of the material forming the base film 10 include polyimide, polyethylene terephthalate, and fluororesin.
- the thickness of the base film 10 is, for example, 80 ⁇ m or less.
- the thickness of the base film 10 is preferably 50 ⁇ m or less.
- the thickness of the base film 10 is preferably 20 ⁇ m or less.
- the thickness of the base film 10 is the distance between the first major surface 10a and the second major surface 10b.
- a through hole 10c and a through hole 10d are formed in the base film 10.
- the through holes 10c and 10d pass through the base film 10 along the thickness direction.
- the coil wiring 20 is arranged on the main surface of the base film 10 .
- the coil wiring 20 has a first coil wiring 21 and a second coil wiring 22 .
- the first coil wiring 21 is arranged on the first main surface 10a.
- the second coil wiring 22 is arranged on the second main surface 10b.
- the first coil wiring 21 and the second coil wiring 22 are electrically connected to each other.
- the first coil wiring 21 is spirally wound along the thickness direction of the base film 10 when viewed from the first main surface 10a side. From another point of view, the first coil wiring 21 constitutes a coil (first coil). One end of the first coil wiring 21 is outside the first coil. The other end of the first coil wiring 21 is inside the first coil. One end of the first coil wiring 21 is a land 21a. The other end of the first coil wiring 21 is a land 21b.
- the second coil wiring 22 is spirally wound along the thickness direction of the base film 10 when viewed from the second main surface 10b side. From another point of view, the second coil wiring 22 constitutes a coil (second coil). One end of the second coil wiring 22 is inside the second coil. The other end of the second coil wiring 22 is outside the second coil. One end of the second coil wiring 22 is a land 22a.
- the land 22a is electrically connected to the land 21b by the second layer 23b, the first electrolytic plated layer 24 and the second electrolytic plated layer 25 which are arranged on the inner wall surface of the through hole 10c. Note that the land 22a may be electrically connected to the land 21b by filling the first electrolytic plated layer 24 and the second electrolytic plated layer 25 in the through hole 10c.
- the coil wiring 20 (the first coil wiring 21 and the second coil wiring 22) has a seed layer 23, a first electroplating layer 24, and a second electroplating layer 25.
- the seed layer 23 is arranged on the main surfaces of the base film 10 (the first main surface 10a and the second main surface 10b).
- the seed layer 23 has a first layer 23a and a second layer 23b.
- the first layer 23a is arranged on the main surfaces of the base film 10 (the first main surface 10a and the second main surface 10b).
- the first layer 23a is, for example, a sputtered layer (a layer formed by sputtering) made of a nickel-chromium alloy.
- the second layer 23b is arranged on the first layer 23a.
- the second layer 23b is, for example, an electroless plating layer (a layer formed by electroless plating) made of copper.
- the second layer 23b is also formed on the inner wall surfaces of the through holes 10c and 10d.
- the first electroplating layer 24 is a layer formed by electroplating.
- the first electrolytic plating layer 24 is arranged on the seed layer 23 (second layer 23b).
- the first electroplating layer 24 is made of copper, for example.
- the first electrolytic plating layer 24 is also arranged on the second layer 23b on the inner wall surfaces of the through holes 10c and 10d.
- the second electroplating layer 25 is a layer formed by electroplating.
- the second electrolytic plated layer 25 covers the first electrolytic plated layer 24 . More specifically, the second electroplating layer 25 is arranged on the seed layer 23 and on the side and top surfaces of the first electroplating layer 24 .
- the second electroplating layer 25 is also arranged on the first electroplating layer 24 on the inner wall surfaces of the through holes 10c and 10d.
- the interval between the portions of the adjacent coil wiring 20 is assumed to be the interval SP.
- Width W is the width of the coil wiring 20 .
- the spacing SP is, for example, 20 ⁇ m or less.
- the spacing SP is preferably 15 ⁇ m or less. More preferably, the spacing SP is 10 ⁇ m or less.
- the spacing SP is preferably smaller than the width W.
- the width W is, for example, 25 ⁇ m or less.
- it is preferable that the height of the coil wiring 20 is larger than the width W.
- the height of the coil wiring 20 is, for example, 35 ⁇ m or more.
- the interval SP and the width W In the measurement of the interval SP and the width W, first, five measurement points are set in the length direction of the coil wiring 20 . The intervals between these measurement points are set to be equal in the length direction of the coil wire 20 . However, it suffices if the intervals between these measurement points are approximately equal intervals, and strictly speaking, they do not have to be equal intervals. Second, for each measurement point, the width of the coil wiring 20 and the interval between adjacent portions of the coil wiring 20 are measured in a cross section perpendicular to the length direction of the coil wiring 20 . Then, the average value of the measured values is used as the interval SP and the width W.
- the number of turns of the first coil wiring 21 is greater than the number of turns of the second coil wiring 22.
- the number of turns of the first coil wiring 21 is preferably 1.1 to 4.3 times the number of turns of the second coil wiring 22 .
- the number of turns of the first coil wiring 21 is the number of first coil wirings 21 located on one side of the center of the coil and It is the average value of the number of first coil wires 21 on the other side of the center.
- the number of turns of the second coil wiring 22 is calculated by the same method as for the first coil wiring 21 . 1 and 2, the number of turns of the first coil wiring 21 is 5, and the number of turns of the second coil wiring 22 is 3.5.
- the first coil wiring 21 is longer than the second coil wiring 22.
- the length of the first coil wiring 21 is the distance between one end of the first coil wiring 21 and the other end of the first coil wiring 21 .
- the length of the second coil wiring 22 is the distance between one end of the second coil wiring 22 and the other end of the second coil wiring 22 .
- the length of the first coil wiring 21 is preferably 1.1 to 3.0 times the length of the second coil wiring 22 .
- the length of the first coil wiring 21 is the length of the first coil wiring 21 between lands at both ends of the first coil wiring 21 . More specifically, the length of the first coil wiring 21 is the length of the first coil wiring 21 between the land 21a and the land 21b.
- the length of the second coil wiring 22 is the length of the second coil wiring 22 between lands at both ends of the second coil wiring 22 . More specifically, the length of the second coil wiring 22 is the length of the second coil wiring 22 between the land 22 a and the second connection land 40 .
- the area ratio of the first coil wiring 21 is larger than that of the second coil wiring 22 .
- the area ratio of the first coil wiring 21 is preferably 1.1 to 2.5 times the area ratio of the second coil wiring 22 .
- the first coil wiring 21 and the second coil wiring 22 can be preferably wound.
- the area ratio of the first coil wiring 21 is defined as the area of the first coil wiring 21 when viewed along the thickness direction of the base film 10 from the side of the first main surface 10a and the area between the adjacent first coil wirings 21. It is a value obtained by dividing the total area of the first main surface 10a in , by the total area of the first main surface 10a.
- the area ratio of the second coil wiring 22 is defined as the area of the second coil wiring 22 when viewed along the thickness direction of the base film 10 from the second main surface 10b side and the area between the adjacent second coil wirings 22. It is a value obtained by dividing the total area of the second main surface 10b at the position by the total area of the second main surface 10b.
- the first connection land 30 and the second connection land 40 are arranged on the second main surface 10b.
- the first connection land 30 is electrically connected to the land 21a by the second layer 23b, the first electroplating layer 24 and the second electroplating layer 25 which are arranged on the inner wall surface of the through hole 10d.
- the first connection land 30 may be electrically connected to the land 21a by filling the first electrolytic plated layer 24 and the second electrolytic plated layer 25 in the through hole 10d.
- the second connection land 40 is connected to the other end of the second coil wiring 22 .
- the first connection land 30 and the second connection land 40 are electrically connected to one end and the other end of the coil wire 20, respectively.
- the printed wiring board 100 is electrically connected to an external device at the first connection land 30 and the second connection land 40 .
- the coil wiring 20 is energized, and magnetic fields are generated in the first coil and the second coil.
- the first connection land 30 and the second connection land 40 are composed of the seed layer 23 , the first electroplating layer 24 and the second electroplating layer 25 , like the coil wiring 20 .
- the printed wiring board 100 constitutes an actuator together with the magnet 110, for example.
- FIG. 6 is a schematic diagram of an actuator using the printed wiring board 100. As shown in FIG. As shown in FIG. 6 , printed wiring board 100 is preferably arranged such that first main surface 10 a faces magnet 110 .
- the printed wiring board 100 is manufactured using, for example, a semi-additive method.
- 7A to 7D are process diagrams showing a method for manufacturing printed wiring board 100.
- the method for manufacturing printed wiring board 100 includes a preparation step S1, a seed layer forming step S2, a resist forming step S3, a first electroplating step S4, and a resist removing step S5. , an etching step S6 and a second electroplating step S7.
- the base film 10 is prepared. No coil wiring 20 is formed on the main surface of the base film prepared in the preparation step S1.
- FIG. 8 is a cross-sectional view for explaining the seed layer forming step S2.
- a seed layer 23 is formed.
- the first layer 23a is formed by sputtering, for example.
- the second layer 23b is formed by, for example, electroless plating.
- the through holes 10c and 10d are formed after the first layer 23a is formed and before the second layer 23b is formed.
- the through holes 10c and 10d are formed using, for example, a laser or a drill. Therefore, the second layer 23b is formed on the inner wall surfaces of the through holes 10c and 10d.
- FIG. 9 is a cross-sectional view for explaining the resist forming step S3.
- a resist 50 is formed on the seed layer 23 in the resist forming step S3.
- the resist 50 is formed by applying a photosensitive organic material and patterning the applied photosensitive organic material by exposing and developing it.
- the resist 50 may be formed by applying a dry film resist onto the seed layer 23 and patterning the applied dry film resist by exposing and developing it.
- the resist 50 has openings. The seed layer 23 is exposed through the opening of the resist 50 .
- FIG. 10 is a cross-sectional view for explaining the first electroplating step S4.
- the first electroplating layer 24 is formed in the first electroplating step S4.
- the first electroplating layer 24 is grown on the seed layer 23 exposed from the openings of the resist 50 by energizing the seed layer 23 in the plating solution.
- the first electroplating layer 24 also grows on the second layer 23b above the through holes 10c and 10d.
- FIG. 11 is a cross-sectional view for explaining the resist removing step S5. As shown in FIG. 11, the resist 50 is removed in the resist removing step S5. After the resist 50 is removed, the seed layer 23 is exposed between the adjacent first electroplating layers 24 .
- FIG. 12 is a cross-sectional view for explaining the etching step S6. As shown in FIG. 12, in the etching step S6, the seed layer 23 exposed between the adjacent first electroplating layers 24 is removed by etching.
- the second layer 23b is etched.
- Etching of the second layer 23b is performed by supplying an etchant between the adjacent first electroplating layers 24 .
- the etchant is selected so that etching is rate-determined by the reaction between the reactive species in the etchant and the object to be etched rather than the diffusion of the reactive species in the etchant to the vicinity of the object to be etched.
- the etchant used is an etchant that has a dissolution reaction rate of 1.0 ⁇ m/min or less for the material (that is, copper) forming the second layer 23b.
- the etching solution include sulfuric acid hydrogen peroxide aqueous solution and sodium peroxodisulfate aqueous solution. The dissolution reaction rate of the etchant is measured based on the weight of copper reduced after etching and the etching time.
- the first layer 23a is etched.
- the etchant is switched.
- an etchant having a high selectivity with respect to the material (that is, nickel-chromium alloy) forming the first layer 23a is used. Therefore, after switching the etchant, the etching of the first electroplating layer 24 is difficult to proceed.
- the second electroplating layer 25 is formed in the second electroplating step S7.
- the seed layer 23 and the first electroplating layer 24 are energized in the plating solution to form the second electroplating layer 25 so as to cover the seed layer 23 and the first electroplating layer 24. grow up.
- the second electrolytic plated layer 25 also grows on the first electrolytic plated layer 24 above the through holes 10c and 10d.
- the printed wiring board 100 having the structure shown in FIGS. 1 to 5 is manufactured.
- the first connection land 30 and the second connection land 40 In order to energize the coil wiring 20, the first connection land 30 and the second connection land 40 must be electrically connected to the coil wiring 20.
- As a method of arranging the first connection lands 30 and the second connection lands 40 it is conceivable to arrange the first connection lands 30 and the second connection lands 40 on a printed wiring board different from the printed wiring board 100 .
- a printed wiring board other than the printed wiring board 100 is required to configure the coil device, which increases the thickness of the coil device.
- the first connection lands 30 and the second connection lands 40 are arranged on the second main surface 10b. becomes unnecessary. Therefore, the coil device can be configured only by the printed wiring board 100, and the thickness of the coil device can be reduced.
- the number of turns of the second coil wiring 22 is smaller than the number of turns of the first coil wiring 21. (the second coil wiring 22 becomes shorter than the first coil wiring 21, the area ratio of the second coil wiring 22 becomes smaller than the area ratio of the first coil wiring 21).
- the printed wiring board 100 since the first main surface 10a is arranged to face the magnet 110, the number of turns (length, area ratio) of the second coil wiring 22 is reduced. Nonetheless, it is possible to maintain thrust when used in actuators.
- an etchant with a high dissolution reaction rate for the material forming the seed layer that is, an etchant in which the diffusion of the reactive species in the etchant to the vicinity of the etching target determines the etching rate
- an etchant with a high dissolution reaction rate for the material forming the seed layer that is, an etchant in which the diffusion of the reactive species in the etchant to the vicinity of the etching target determines the etching rate
- an etchant having a low dissolution reaction rate with respect to the material forming the second layer 23b is used in the etching step S6.
- the etching in the etching step S6 is rate-determined by the reaction between the reactive species in the etching solution and the object to be etched. Etching of the second layer 23b is less likely to vary.
- the distance between adjacent parts of the coil wiring 20 can be shortened, and the number of turns (length, area ratio) of the first coil wiring 21 and the second coil wiring 22 can be increased. can be made As a result, according to the printed wiring board 100, it is possible to reduce the thickness of the coil device while maintaining the thrust force when using it as an actuator.
- Samples 1 to 5 were provided as samples of the printed wiring board 100 for the simulation. In sample 1, the number of turns of the first coil wiring 21 and the number of turns of the second coil wiring 22 were made equal. On the other hand, in samples 2 to 5, the number of turns of the first coil wiring 21 was made larger than the number of turns of the second coil wiring 22 . Samples 1 to 5 were arranged such that the first main surface 10 a faced the magnet 110 . In each sample, two types of thickness were applied as the thickness of the base film 10 .
- the width W was constant at 25 ⁇ m.
- the interval SP was sequentially decreased so that the number of turns of the first coil wiring 21 could be increased.
- ⁇ Appendix 1> a base film having a major surface; a coil wiring formed on the main surface; A first connection land and a second connection land connected to one end and the other end of the coil wiring,
- the main surface has a first main surface and a second main surface opposite to the first main surface,
- the coil wiring includes a first coil wiring spirally formed on the first principal surface and a spiral coil wiring formed on the second principal surface and electrically connected to the first coil wiring. and a second coil wiring connected, The first connection land and the second connection land are formed on the second main surface, The printed wiring board, wherein the first coil wiring is longer than the second coil wiring.
- the first connection land and the second connection land can be formed on the second main surface by adjusting the length of the coil wiring, so the thickness of the coil device can be reduced. can do.
- ⁇ Appendix 3> a base film having a major surface; a coil wiring formed on the main surface; A first connection land and a second connection land connected to one end and the other end of the coil wiring,
- the main surface has a first main surface and a second main surface opposite to the first main surface,
- the coil wiring includes a first coil wiring spirally formed on the first principal surface and a spiral coil wiring formed on the second principal surface and electrically connected to the first coil wiring. and a second coil wiring connected, The first connection land and the second connection land are formed on the second main surface,
- the printed wiring board wherein the area ratio of the first coil wiring is larger than the area ratio of the second coil wiring.
- the first connection land and the second connection land can be formed on the second main surface by adjusting the area ratio of the coil wiring, so the thickness of the coil device can be reduced. can do.
- ⁇ Appendix 4> The printed wiring board according to appendix 3, wherein the area ratio of the first coil wiring is 1.1 times or more and 2.5 times or less as large as the area ratio of the second coil wiring.
- 10 base film 10a first main surface, 10b second main surface, 10c through hole, 10d through hole, 20 coil wiring, 21 first coil wiring, 21a land, 21b land, 22 second coil wiring, 22a land, 23 seed layer, 23a first layer, 23b second layer, 24 first electroplating layer, 25 second electroplating layer, 30 first connection land, 40 second connection land, 50 resist, 100 printed wiring board, 110 magnet, S1 Preparation process, S2 Seed layer formation process, S3 Resist formation process, S4 First electroplating process, S5 Resist removal process, S6 Etching process, S7 Second electroplating process, SP Spacing, W Width.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
- Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
特許文献1に記載のプリント配線板では、配線の一方端及び他方端が接続ランドに電気的に接続されている必要がある。接続ランドは、別のプリント配線板に配置することが考えられる。しかしながら、この場合、特許文献1に記載のプリント配線板以外のプリント配線板が必要になるため、特許文献1に記載のプリント配線板を用いたコイル装置の厚さが増大してしまう。
本開示のプリント配線板によれば、コイル装置の厚さを小さくすることが可能である。
まず、本開示の実施形態を列記して説明する。
次に、本開示の実施形態の詳細を、図面を参照しながら説明する。以下の図面では、同一又は相当する部分に同一の参照符号を付し、重複する説明は繰り返さないものとする。
以下に、実施形態に係るプリント配線板(「プリント配線板100」とする)の構成を説明する。
以下に、プリント配線板100の製造方法を説明する。
以下に、プリント配線板100の効果を説明する。
プリント配線板100の効果を確認するため、シミュレーションを行った。シミュレーションでは、第1コイル配線21の巻き数及び第2コイル配線22の巻き数の和が同一となるように第1コイル配線21の巻き数及び第2コイル配線22の巻き数が変化させながら、プリント配線板100が磁石110に対して発生させる推力を算出した。
本開示に係るプリント配線板の構成を、以下に付記する。
主面を有するベースフィルムと、
前記主面上に形成されているコイル配線と、
前記コイル配線の一方端及び他方端に接続されている第1接続ランド及び第2接続ランドとを備え、
前記主面は、第1主面と、前記第1主面の反対面である第2主面とを有し、
前記コイル配線は、前記第1主面上に渦巻状に形成されている第1コイル配線と、前記第2主面上に渦巻状に形成されており、かつ前記第1コイル配線に電気的に接続されている第2コイル配線とを有し、
前記第1接続ランド及び前記第2接続ランドは、前記第2主面上に形成されており、
前記第1コイル配線は、前記第2コイル配線よりも長い、プリント配線板。
前記第1コイル配線の長さは、前記第2コイル配線の長さの1.1倍以上3.0倍以下である、付記1に記載のプリント配線板。
主面を有するベースフィルムと、
前記主面上に形成されているコイル配線と、
前記コイル配線の一方端及び他方端に接続されている第1接続ランド及び第2接続ランドとを備え、
前記主面は、第1主面と、前記第1主面の反対面である第2主面とを有し、
前記コイル配線は、前記第1主面上に渦巻状に形成されている第1コイル配線と、前記第2主面上に渦巻状に形成されており、かつ前記第1コイル配線に電気的に接続されている第2コイル配線とを有し、
前記第1接続ランド及び前記第2接続ランドは、前記第2主面上に形成されており、
前記第1コイル配線の面積率は、前記第2コイル配線の面積率よりも大きい、プリント配線板。
前記第1コイル配線の面積率は、前記第2コイル配線の面積率の1.1倍以上2.5倍以下である、付記3に記載のプリント配線板。
Claims (8)
- 主面を有するベースフィルムと、
前記主面上に形成されているコイル配線と、
前記コイル配線の一方端及び他方端に接続されている第1接続ランド及び第2接続ランドとを備え、
前記主面は、第1主面と、前記第1主面の反対面である第2主面とを有し、
前記コイル配線は、前記第1主面上に渦巻状に形成されている第1コイル配線と、前記第2主面上に渦巻状に形成されており、かつ前記第1コイル配線に電気的に接続されている第2コイル配線とを有し、
前記第1接続ランド及び前記第2接続ランドは、前記第2主面上に形成されており、
前記第1コイル配線の巻き数は、前記第2コイル配線の巻き数よりも多い、プリント配線板。 - 前記第1コイル配線の巻き数は、前記第2コイル配線の巻き数の1.1倍以上4.3倍以下である、請求項1に記載のプリント配線板。
- 前記第1コイル配線は、前記第2コイル配線よりも長い、請求項1又は請求項2に記載のプリント配線板。
- 前記第1コイル配線の面積率は、前記第2コイル配線の面積率よりも大きい、請求項1から請求項3のいずれか1項に記載のプリント配線板。
- 前記第1コイル配線の長さは、前記第2コイル配線の長さの1.1倍以上3.0倍以下である、請求項3に記載のプリント配線板。
- 前記第1コイル配線の面積率は、前記第2コイル配線の面積率の1.1倍以上2.5倍以下である、請求項4に記載のプリント配線板。
- 前記第1主面が磁石と対向するように配置される、請求項1から請求項6のいずれか1項に記載のプリント配線板。
- 隣り合う前記コイル配線の2つの部分の間の間隔は、20μm以下である、請求項1から請求項7のいずれか1項に記載のプリント配線板。
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JP2018198277A (ja) * | 2017-05-24 | 2018-12-13 | イビデン株式会社 | コイル内蔵基板 |
JP2020013827A (ja) * | 2018-07-13 | 2020-01-23 | イビデン株式会社 | コイル基板 |
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