WO2014002764A1 - 積層型フラットケーブル及びその製造方法 - Google Patents
積層型フラットケーブル及びその製造方法 Download PDFInfo
- Publication number
- WO2014002764A1 WO2014002764A1 PCT/JP2013/066209 JP2013066209W WO2014002764A1 WO 2014002764 A1 WO2014002764 A1 WO 2014002764A1 JP 2013066209 W JP2013066209 W JP 2013066209W WO 2014002764 A1 WO2014002764 A1 WO 2014002764A1
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- WIPO (PCT)
- Prior art keywords
- signal line
- flat cable
- ground conductor
- main surface
- laminated flat
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/003—Coplanar lines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/04—Punching, slitting or perforating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/001—Manufacturing waveguides or transmission lines of the waveguide type
- H01P11/003—Manufacturing lines with conductors on a substrate, e.g. strip lines, slot lines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/08—Microstrips; Strip lines
- H01P3/085—Triplate lines
-
- 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
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/0242—Structural details of individual signal conductors, e.g. related to the skin effect
-
- 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
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/025—Impedance arrangements, e.g. impedance matching, reduction of parasitic impedance
- H05K1/0253—Impedance adaptations of transmission lines by special lay-out of power planes, e.g. providing openings
-
- 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
- H05K1/0277—Bendability or stretchability details
- H05K1/028—Bending or folding regions of flexible printed circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/04—Punching, slitting or perforating
- B32B2038/042—Punching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/204—Di-electric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
- H01P5/022—Transitions between lines of the same kind and shape, but with different dimensions
- H01P5/028—Transitions between lines of the same kind and shape, but with different dimensions between strip lines
-
- 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
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
- H05K1/0219—Printed shielding conductors for shielding around or between signal conductors, e.g. coplanar or coaxial printed shielding conductors
- H05K1/0221—Coaxially shielded signal lines comprising a continuous shielding layer partially or wholly surrounding the signal lines
-
- 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
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
- H05K1/0224—Patterned shielding planes, ground planes or power planes
- H05K1/0225—Single or multiple openings in a shielding, ground or power plane
-
- 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
- H05K1/14—Structural association of two or more printed circuits
- H05K1/147—Structural association of two or more printed circuits at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/09618—Via fence, i.e. one-dimensional array of vias
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
- H05K2201/0969—Apertured conductors
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
- H05K2201/09727—Varying width along a single conductor; Conductors or pads having different widths
Definitions
- the present invention relates to a laminated flat cable and a manufacturing method thereof, and more specifically to a laminated flat cable used for transmission of a high frequency signal and a manufacturing method thereof.
- FIG. 14 is an exploded view of the high-frequency signal transmission line 500 described in Patent Document 1.
- a signal line 500 shown in FIG. 14 includes a dielectric body 512, a ground conductor 530, a signal line 532, and an auxiliary ground conductor 534.
- the dielectric body 512 is configured by laminating dielectric sheets 522a to 522c in this order.
- the signal line 532 is provided on the dielectric sheet 522b.
- the ground conductor 530 is provided on the dielectric sheet 522a and faces the signal line 532 through the dielectric sheet 522a.
- the ground conductor 530 is provided with a plurality of openings 540 that overlap with the signal line 532.
- the ground conductor 534 is provided on the dielectric sheet 522c and faces the signal line 532 through the dielectric sheet 522b.
- the dielectric element body 512 can be thinned.
- the characteristic impedance of the signal line 532 may vary as described below. More specifically, in the signal line 500, the ground conductor 530 is a conductor provided with an opening 540, and the ground conductor 534 is a solid conductor.
- the signal line 532 has a characteristic impedance higher than a predetermined characteristic impedance (for example, 50 ⁇ ) when the ground conductor 534 is present and the ground conductor 530 is not present. And the distance between the ground conductor 534 and the ground conductor 534 are designed.
- a predetermined characteristic impedance for example, 50 ⁇
- the shape of the opening 540 of the ground conductor 530 and the signal line 532 and the ground conductor 530 are set so that the characteristic impedance of the signal line 532 with the ground conductor 530 added becomes a predetermined characteristic impedance (for example, 50 ⁇ ). Design the spacing.
- the characteristic impedance of the signal line 532 in the state where the ground conductor 534 exists and the ground conductor 530 does not exist is determined by the distance between the signal line 532 and the ground conductor 534. Therefore, the signal line 500 is required to be manufactured so that the distance between the signal line 532 and the ground conductor 534 becomes a design value.
- the signal line 532 is provided on the dielectric sheet 522b, and the ground conductor 534 is provided on the dielectric sheet 522c. For this reason, there is a possibility that the distance between the signal line 532 and the ground conductor 534 may deviate from the design value due to variations in the contact state between the dielectric sheets 522b and 522c when the dielectric sheets 522b and 522c are stacked. As a result, the characteristic impedance of the signal line 532 may vary.
- an object of the present invention is to provide a laminated flat cable that can suppress the occurrence of variations in the characteristic impedance of a signal line and a method for manufacturing the same.
- a laminated flat cable includes a first base layer having a first main surface and a second main surface, and a second base having a third main surface and a fourth main surface.
- An auxiliary ground conductor formed and opposed to the signal line, and the auxiliary ground conductor is provided with a plurality of openings arranged along the signal line, Features.
- the manufacturing method of the laminated flat cable which concerns on one form of this invention is a 1st process of forming a reference
- FIG. 1 is an external perspective view of a laminated flat cable according to an embodiment of the present invention.
- FIG. 2 is an exploded view of a dielectric element body of the laminated flat cable of FIG. 1.
- FIG. 2 is a cross-sectional structure diagram of the laminated flat cable of FIG. 1. It is a sectional structure figure of a lamination type flat cable. It is the figure which planarly viewed the signal track
- FIG. 8 is a cross-sectional structure diagram at C in FIG. It is process sectional drawing at the time of manufacture of a laminated type flat cable. It is an exploded view of the laminated body of the laminated flat cable which concerns on a 1st modification. It is a sectional structure figure of a lamination type flat cable concerning the 2nd modification. It is the figure which planarly viewed the signal track
- FIG. 1 is an external perspective view of a laminated flat cable 10 according to an embodiment of the present invention.
- FIG. 2 is an exploded view of the dielectric body 12 of the multilayer flat cable 10 of FIG.
- FIG. 3 is a cross-sectional structure diagram of the laminated flat cable 10 of FIG.
- FIG. 4 is a cross-sectional structure diagram of the laminated flat cable 10.
- FIG. 5 is a plan view of the signal line 20 and the auxiliary ground conductor 24 of the laminated flat cable 10 from the lamination direction. 1 to 5, the stacking direction of the stacked flat cable 10 is defined as the z-axis direction.
- the longitudinal direction of the laminated flat cable 10 is defined as the x-axis direction, and the direction orthogonal to the x-axis direction and the z-axis direction is defined as the y-axis direction.
- the laminated flat cable 10 is used for connecting two high-frequency circuits in an electronic device such as a mobile phone. As shown in FIGS. 1 to 3, the laminated flat cable 10 includes a dielectric body 12, external terminals 16 (16a, 16b), a signal line 20, a reference ground conductor 22, an auxiliary ground conductor 24, and through holes T1 to T1. T4 and connectors 100a and 100b are provided.
- the dielectric body 12 is a flexible plate-like member that extends in the x-axis direction when viewed in plan from the z-axis direction, and includes a line portion 12 a, a connection portion 12 b, 12c is included.
- the dielectric body 12 includes a protective layer 14, a dielectric sheet 18 a, an adhesive layer 19, a dielectric sheet 18 b, and a protective layer 15, from the positive side in the z-axis direction to the negative side. It is the laminated body comprised by laminating
- the main surface on the positive side in the z-axis direction of the dielectric body 12 is referred to as the front surface
- the main surface on the negative direction side in the z-axis direction of the dielectric body 12 is referred to as the back surface.
- the line portion 12a extends in the x-axis direction.
- the connecting portions 12b and 12c are respectively connected to the negative end portion in the x-axis direction and the positive end portion in the x-axis direction of the line portion 12a, and have a rectangular shape.
- the widths of the connecting portions 12b and 12c in the y-axis direction are wider than the width of the line portion 12a in the y-axis direction.
- the dielectric sheets 18 a and 18 b extend in the x-axis direction when viewed in plan from the z-axis method, and have the same shape as the dielectric body 12.
- the dielectric sheets 18a and 18b are made of a flexible thermoplastic resin such as polyimide or liquid crystal polymer.
- the main surface on the positive side in the z-axis direction of the dielectric sheet 18a is referred to as the front surface (first main surface), and the main surface on the negative direction side in the z-axis direction of the dielectric sheet 18a is the back surface (second surface).
- the main surface ).
- the main surface on the positive side in the z-axis direction of the dielectric sheet 18b is referred to as the front surface (third main surface), and the main surface on the negative direction side in the z-axis direction of the dielectric sheet 18b is the back surface (fourth main surface). )
- the dielectric sheets 18a and 18b are laminated so that the back surface of the dielectric sheet 18a and the surface of the dielectric sheet 18b face each other. However, an adhesive layer 19 is provided between the back surface of the dielectric sheet 18a and the surface of the dielectric sheet 18b.
- the thickness T11 of the dielectric sheet 18a is larger than the thickness T12 of the dielectric sheet 18b.
- the thickness T11 is, for example, 50 to 300 ⁇ m. In the present embodiment, the thickness T11 is 100 ⁇ m.
- the thickness T12 is, for example, 10 to 100 ⁇ m. In the present embodiment, the thickness T12 is 25 ⁇ m.
- the dielectric sheet 18a includes a line portion 18a-a and connection portions 18a-b and 18a-c.
- the dielectric sheet 18b includes a line portion 18b-a and connection portions 18b-b and 18b-c.
- the line portions 18a-a and 18b-a constitute the line portion 12a.
- the connecting portions 18a-b and 18b-b constitute the connecting portion 12b.
- the connecting portions 18a-c and 18b-c constitute a connecting portion 12c.
- the adhesive layer 19 extends in the x-axis direction when viewed in plan from the z-axis direction, and has the same shape as the dielectric body 12.
- the adhesive layer 19 is an adhesive layer that adheres the back surface of the dielectric sheet 18a and the front surface of the dielectric sheet 18b, and is made of, for example, a resin adhesive such as polyimide or vinyl acetate.
- the thickness T13 (see FIG. 4) of the adhesive layer 19 is, for example, 10 ⁇ m to 50 ⁇ m. In the present embodiment, the thickness T13 is 25 ⁇ m. As shown in FIG. 4, the thickness T11 is larger than the sum of the thickness T12 and the thickness T13.
- the signal line 20 is a linear conductor that transmits a high-frequency signal and is formed on the back surface of the dielectric sheet 18a.
- the signal line 20 extends in the x-axis direction along the line portion 18a-a.
- the end of the signal line 20 on the negative direction side in the x-axis direction is located at the center of the connection portion 18a-b.
- the end on the positive direction side in the x-axis direction of the signal line 20 is located at the center of the connecting portions 18a-c.
- a high frequency signal is transmitted to the signal line 20.
- the line width of the signal line 20 is, for example, 100 to 500 ⁇ m. In the present embodiment, the line width of the signal line 20 is 300 ⁇ m.
- the signal line 20 is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the signal line 20 is formed on the back surface of the dielectric sheet 18a means that the signal line 20 is formed by patterning a metal foil formed by plating on the back surface of the dielectric sheet 18a, It means that the signal line 20 is formed by patterning the metal foil attached to the back surface of the dielectric sheet 18a.
- the surface of the signal line 20 is smoothed, the surface roughness of the surface where the signal line 20 is in contact with the dielectric sheet 18a is the surface of the surface where the signal line 20 is not in contact with the dielectric sheet 18a. It becomes larger than the roughness.
- the reference ground conductor 22 is formed on the surface of the dielectric sheet 18a and faces the signal line 20 through the dielectric sheet 18a. More specifically, the reference ground conductor 22 is a solid conductor extending in the x-axis direction on the surface of the dielectric sheet 18a.
- the reference ground conductor 22 is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the reference ground conductor 22 is formed on the surface of the dielectric sheet 18a. That is, the reference ground conductor 22 is formed by patterning a metal foil formed by plating on the surface of the dielectric sheet 18a. Alternatively, the reference ground conductor 22 is formed by patterning the metal foil attached to the surface of the dielectric sheet 18a.
- the surface roughness of the surface where the reference ground conductor 22 is in contact with the dielectric sheet 18a is not in contact with the dielectric sheet 18a. It becomes larger than the surface roughness of the surface.
- the reference ground conductor 22 includes a line portion 22a and terminal portions 22b and 22c.
- the line portion 22a is provided on the surface of the line portion 18a-a and extends in the x-axis direction.
- the terminal portion 22b is provided on the surface of the line portion 18a-b and forms a rectangular ring.
- the terminal portion 22b is connected to the end portion on the negative direction side in the x-axis direction of the line portion 22a.
- the terminal portion 22c is provided on the surface of the line portion 18a-c and forms a rectangular ring.
- the terminal portion 22c is connected to the end portion on the positive direction side in the x-axis direction of the line portion 22a.
- the auxiliary ground conductor 24 is formed on the back surface of the dielectric sheet 18 b and faces the signal line 20 through the dielectric sheet 18 b and the adhesive layer 19. More specifically, the auxiliary ground conductor 24 is a conductor extending in the x-axis direction on the back surface of the dielectric sheet 18b.
- the auxiliary ground conductor 24 is provided with a plurality of openings 30 arranged along the signal line 20. Hereinafter, the opening 30 will be described with reference to the drawings.
- the opening 30 overlaps with the signal line 20 when viewed in plan from the z-axis direction, and has a cross shape. More specifically, the opening 30 has a shape in which four corners of a rectangle having a longitudinal direction in the x-axis direction are cut out. Therefore, the width W2 in the y-axis direction at both ends in the x-axis direction of the opening 30 is smaller than the width W1 in the y-axis direction in an intermediate portion excluding both ends in the x-axis direction of the opening 30.
- the plurality of openings 30 are arranged in a line in the x-axis direction. Therefore, a part of the auxiliary ground conductor 24 exists between the adjacent openings 30. Therefore, a part of the auxiliary ground conductor 24 existing between the adjacent openings 30 is referred to as a bridge portion 60.
- the auxiliary ground conductor 24 has a ladder shape.
- a plurality of openings 30 and a plurality of bridge portions 60 are alternately overlapped.
- the signal line 20 crosses the center of the opening 30 and the bridge portion 60 in the y-axis direction in the x-axis direction.
- a region corresponding to both ends of the opening 30 in the x-axis direction is referred to as a region A3.
- a region corresponding to an intermediate portion excluding both ends of the opening 30 in the x-axis direction is referred to as a region A1.
- a region corresponding to the bridge portion 60 is referred to as A2.
- the auxiliary ground conductor 24 is made of a metal material having a small specific resistance mainly composed of silver or copper.
- the auxiliary ground conductor 24 is formed on the back surface of the dielectric sheet 18b means that the auxiliary ground conductor 24 is formed by patterning a metal foil formed by plating on the back surface of the dielectric sheet 18b.
- the auxiliary ground conductor 24 is formed by patterning the metal foil attached to the back surface of the dielectric sheet 18b.
- the surface of the auxiliary ground conductor 24 is smoothed, the surface roughness of the surface where the auxiliary ground conductor 24 is in contact with the dielectric sheet 18b is not in contact with the dielectric sheet 18b. It becomes larger than the surface roughness of the surface.
- the auxiliary ground conductor 24 includes a line portion 24a and terminal portions 24b and 24c.
- the line portion 24a is provided on the back surface of the line portion 18b-a and extends in the x-axis direction.
- the terminal portion 24b is provided on the back surface of the line portion 18b-b and forms a rectangular ring.
- the terminal portion 24b is connected to the end portion on the negative direction side in the x-axis direction of the line portion 24a.
- the terminal portion 24c is provided on the surface of the line portion 18b-c and forms a rectangular ring.
- the terminal portion 24c is connected to the end portion on the positive direction side in the x-axis direction of the line portion 24a.
- the external terminal 16a is a rectangular conductor formed in the center on the surface of the connecting portion 18a-b, as shown in FIGS. Therefore, the external terminal 16a overlaps the end of the signal line 20 on the negative direction side in the x-axis direction when viewed in plan from the z-axis direction.
- the external terminal 16b is a rectangular conductor formed at the center on the surface of the connecting portion 18a-c. Therefore, the external terminal 16b overlaps the end of the signal line 20 on the positive direction side in the x-axis direction when viewed in plan from the z-axis direction.
- the external terminals 16a and 16b are made of a metal material having a small specific resistance mainly composed of silver or copper.
- Ni / Au plating is applied to the surfaces of the external terminals 16a and 16b.
- the external terminals 16a and 16b are formed on the surface of the dielectric sheet 18a.
- the metal foil formed by plating on the surface of the dielectric sheet 18a is patterned to form the external terminals 16a and 16b. It indicates that the external terminals 16a and 16b are formed by patterning the metal foil attached to the surface of the dielectric sheet 18a. Since the surfaces of the external terminals 16a and 16b are smoothed, the surface roughness of the surface where the external terminals 16a and 16b are in contact with the dielectric sheet 18a is the same as that of the external terminals 16a and 16b. It becomes larger than the surface roughness of the non-contact surface.
- the signal line 20 is sandwiched between the reference ground conductor 22 and the auxiliary ground conductor 24. That is, the signal line 20, the reference ground conductor 22, and the auxiliary ground conductor 24 have a triplate type stripline structure.
- the distance between the signal line 20 and the reference ground conductor 22 is substantially equal to the thickness T11 of the dielectric sheet 18a, and is, for example, 50 ⁇ m to 300 ⁇ m. In the present embodiment, the distance between the signal line 20 and the reference ground conductor 22 is 175 ⁇ m.
- the distance between the signal line 20 and the auxiliary ground conductor 24 is substantially equal to the sum of the thickness T12 of the dielectric sheet 18b and the thickness T13 of the adhesive layer 19 as shown in FIG.
- the distance between the signal line 20 and the auxiliary ground conductor 24 is 25 ⁇ m. That is, the distance between the signal line 20 and the auxiliary ground conductor 24 is designed to be smaller than the distance between the signal line 20 and the reference ground conductor 22.
- the through hole T1 (interlayer connection part) penetrates the connection part 18a-b of the dielectric sheet 18a, the adhesive layer 19 and the connection part 18b-b of the dielectric sheet 18b (that is, the dielectric body 12) in the z-axis direction.
- the external terminal 16a is connected to the end of the signal line 20 on the negative side in the x-axis direction.
- the through hole T2 (interlayer connection portion) penetrates the connection portion 18a-c of the dielectric sheet 18a, the adhesive layer 19 and the connection portion 18b-c (that is, the dielectric body 12) of the dielectric sheet 18b in the z-axis direction.
- the external terminal 16b and the end of the signal line 20 on the positive side in the x-axis direction are connected. Thereby, the signal line 20 is connected between the external terminals 16a and 16b.
- the through holes T1 and T2 are formed by filling a through hole formed in the dielectric body 12 with a metal material by Ni / Au plating.
- the through hole T3 (interlayer connection portion) penetrates the line portion 18a-a of the dielectric sheet 18a, the adhesive layer 19, and the line portion 18ba-a of the dielectric sheet 18b (that is, the dielectric body 12) in the z-axis direction.
- the reference ground conductor 22 and the auxiliary ground conductor 24 are connected.
- the plurality of through holes T ⁇ b> 3 are provided on the positive direction side in the y-axis direction from the bridge portions 60, and are arranged in a line in the x-axis direction.
- the through hole T3 is formed by filling a through hole formed in the dielectric element body 12 with a metal material by Ni / Au plating.
- the through hole T4 (interlayer connection portion) penetrates the line portion 18a-a of the dielectric sheet 18a, the adhesive layer 19, and the line portion 18ba-a of the dielectric sheet 18b (that is, the dielectric element body 12) in the z-axis direction.
- the reference ground conductor 22 and the auxiliary ground conductor 24 are connected.
- the plurality of through holes T4 are provided on the negative direction side in the y-axis direction from the bridge portions 60, and are arranged in a line in the x-axis direction.
- the through hole T4 is formed by filling the through hole formed in the dielectric element body 12 with a metal material by Ni / Au plating.
- the protective layer 14 is an insulating film that covers substantially the entire surface of the dielectric sheet 18a. Thereby, the protective layer 14 covers the reference ground conductor 22.
- the protective layer 14 is made of a flexible resin such as a resist material, for example.
- the protective layer 14 includes a line portion 14a and connecting portions 14b and 14c.
- the line portion 14a covers the line portion 22a by covering the entire surface of the line portion 18a-a.
- the connecting portion 14b is connected to the end portion on the negative side in the x-axis direction of the line portion 14a and covers the surface of the connecting portion 18a-b.
- openings Ha to Hd are provided in the connection portion 14b.
- the opening Ha is a rectangular opening provided in the center of the connection portion 14b.
- the external terminal 16a is exposed to the outside through the opening Ha.
- the opening Hb is a rectangular opening provided on the positive side in the y-axis direction with respect to the opening Ha.
- the opening Hc is a rectangular opening provided on the negative direction side in the x-axis direction from the opening Ha.
- the opening Hd is a rectangular opening provided on the negative side in the y-axis direction with respect to the opening Ha.
- the terminal portion 22b functions as an external terminal by being exposed to the outside through the openings Hb to Hd.
- the connecting portion 14c is connected to the end portion on the positive side in the x-axis direction of the line portion 14a and covers the surface of the connecting portion 18a-c.
- openings He to Hh are provided in the connection portion 14c.
- the opening He is a rectangular opening provided in the center of the connection portion 14c.
- the external terminal 16b is exposed to the outside through the opening He.
- the opening Hf is a rectangular opening provided on the positive direction side in the y-axis direction with respect to the opening He.
- the opening Hg is a rectangular opening provided closer to the positive direction side in the x-axis direction than the opening He.
- the opening Hh is a rectangular opening provided on the negative side in the y-axis direction with respect to the opening He.
- the terminal portion 22c functions as an external terminal by being exposed to the outside through the openings Hf to Hh.
- the protective layer 14 is provided with openings H1 and H2 at positions corresponding to the through holes T3 and T4, respectively.
- the protective layer 15 is an insulating film covering substantially the entire back surface of the dielectric sheet 18b. Thereby, the protective layer 15 covers the auxiliary ground conductor 24 including the opening 30.
- the protective layer 15 is made of a flexible resin such as a resist material, for example.
- the protective layer 15 includes a line portion 15a and connecting portions 15b and 15c.
- the line portion 15a covers the line portion 24a by covering the entire back surface of the line portion 18b-a.
- the connecting portion 15b is connected to the end portion on the negative side in the x-axis direction of the line portion 15a and covers the back surface of the connecting portion 18b-b. Thereby, the connection part 15b has covered the terminal part 24b.
- the connection portion 15c is connected to the end portion on the positive side in the x-axis direction of the line portion 15a and covers the back surface of the connection portion 18b-c. Thereby, the connection part 15c has covered the terminal part 24c.
- the protective layer 15 is provided with openings H5, H6, H3, and H4 at positions corresponding to the through holes T1, T2, T3, and T4, respectively.
- the characteristic impedance of the signal line 20 increases between the two adjacent bridge portions 60 in the order of the minimum value Z2, the intermediate value Z3, and the maximum value Z1, and then reaches the maximum. It fluctuates so as to decrease in order of the value Z1, the intermediate value Z3, and the minimum value Z2. More specifically, as shown in FIG. 5, the opening 30 has a width W1 in the region A1, and a width W2 smaller than the width W1 in the region A3. Therefore, the distance between the signal line 20 and the auxiliary ground conductor 24 in the region A1 is larger than the distance between the signal line 20 and the auxiliary ground conductor 24 in the region A3.
- the strength of the magnetic field generated in the signal line 20 in the region A1 becomes larger than the strength of the magnetic field generated in the signal line 20 in the region A3, and the inductance component in the region A1 increases. That is, the L property is dominant in the region A1.
- a bridge portion 60 is provided in the area A2. Therefore, the distance between the signal line 20 and the auxiliary ground conductor 24 in the region A3 is larger than the distance between the signal line 20 and the auxiliary ground conductor 24 in the region A2. Thereby, the capacity
- the characteristic impedance of the signal line 20 increases as the L property becomes dominant, and decreases as the C property becomes dominant. Therefore, the characteristic impedance of the signal line 20 is the maximum value Z1 (for example, 70 ⁇ ) in the region A1.
- the characteristic impedance of the signal line 20 is an intermediate value Z3 (for example, 55 ⁇ ) in the region A3. Further, the characteristic impedance of the signal line 20 is a minimum value Z2 (for example, 30 ⁇ ) in the region A2.
- a plurality of openings 30 and a plurality of bridge portions 60 alternately overlap with the signal line 20. Therefore, the characteristic impedance of the signal line 20 varies periodically.
- the characteristic impedance of the entire laminated flat cable 10 is a predetermined characteristic impedance (for example, 50 ⁇ ).
- FIG. 6 is an external perspective view and a cross-sectional structure diagram of the connector 100 b of the laminated flat cable 10.
- the connector 100b includes a connector main body 102, external terminals 104 and 106, a central conductor 108, and an external conductor 110 as shown in FIGS.
- the connector main body 102 has a shape in which a cylindrical member is connected to a rectangular plate member, and is made of an insulating material such as a resin.
- the external terminal 104 is provided at a position facing the external terminal 16b on the negative side surface in the z-axis direction of the plate member of the connector main body 102.
- the external terminal 106 is provided at a position corresponding to the terminal portion 22c exposed through the openings Hf to Hh on the negative surface side in the z-axis direction of the plate member of the connector main body 102.
- the center conductor 108 is provided at the center of the cylindrical member of the connector main body 102 and is connected to the external terminal 104.
- the center conductor 108 is a signal terminal for inputting or outputting a high frequency signal.
- the external conductor 110 is provided on the inner peripheral surface of the cylindrical member of the connector main body 102 and is connected to the external terminal 106.
- the outer conductor 110 is a ground terminal that is maintained at a ground potential.
- the connector 100 b configured as described above includes the connection portion 12 c such that the external terminal 104 is connected to the external terminal 16 b and the external terminal 106 is connected to the terminal portion 22 c. Mounted on the surface. Thereby, the signal line 20 is electrically connected to the central conductor 108. Further, the reference ground conductor 22 and the auxiliary ground conductor 24 are electrically connected to the external conductor 110.
- FIG. 7 is a plan view of the electronic device 200 using the laminated flat cable 10 from the y-axis direction and the z-axis direction.
- FIG. 8 is a cross-sectional structure diagram at C in FIG.
- the electronic device 200 includes the laminated flat cable 10, circuit boards 202a and 202b, receptacles 204a and 204b, a battery pack (metal body) 206, and a casing 210.
- the circuit board 202a is provided with a transmission circuit or a reception circuit including an antenna, for example.
- a power supply circuit is provided on the circuit board 202b.
- the battery pack 206 is a lithium ion secondary battery, for example, and has a structure in which the surface is covered with a metal cover.
- the circuit board 202a, the battery pack 206, and the circuit board 202b are arranged in this order from the negative direction side to the positive direction side in the x-axis direction.
- the receptacles 204a and 204b are provided on the main surfaces of the circuit boards 202a and 202b on the negative side in the z-axis direction, respectively.
- Connectors 100a and 100b are connected to receptacles 204a and 204b, respectively.
- a high frequency signal having a frequency of, for example, 2 GHz transmitted between the circuit boards 202a and 202b is applied to the central conductor 108 of the connectors 100a and 100b via the receptacles 204a and 204b.
- the external conductor 110 of the connectors 100a and 100b is kept at the ground potential via the circuit boards 202a and 202b and the receptacles 204a and 204b.
- the laminated flat cable 10 connects the circuit boards 202a and 202b.
- the surface of the dielectric body 12 (more precisely, the protective layer 14) is in contact with the battery pack 206 as shown in FIG.
- the dielectric body 12 and the battery pack 206 are fixed with an adhesive or the like.
- the surface of the dielectric body 12 is a main surface located on the reference ground conductor 22 side with respect to the signal line 20. Therefore, a solid reference ground conductor 22 (continuously extending in the x-axis direction) is located between the signal line 20 and the battery pack 206.
- FIG. 9 is a process cross-sectional view at the time of manufacturing the laminated flat cable 10.
- a case where one laminated flat cable 10 is produced will be described as an example, but actually, a plurality of laminated flat cables 10 are produced simultaneously by laminating and cutting a large-sized dielectric sheet. Is done.
- a dielectric sheet 18a made of a thermoplastic resin having a copper foil (metal film) formed on the entire surface on the front surface and the back surface is prepared. Specifically, copper foil is pasted on the front and back surfaces of the dielectric sheet 18a. Further, a copper foil is attached to the back surface of the dielectric sheet 18b. Furthermore, the surface of the copper foil of the dielectric sheets 18a and 18b is smoothed by, for example, applying zinc plating for rust prevention.
- the dielectric sheets 18a and 18b are liquid crystal polymers.
- the thickness of the copper foil is 10 ⁇ m to 20 ⁇ m.
- the external terminals 16a and 16b and the reference ground conductor 22 shown in FIG. 2 are formed on the surface of the dielectric sheet 18a.
- a resist having the same shape as the external terminals 16a and 16b and the reference ground conductor 22 shown in FIG. 2 is printed on the copper foil on the surface of the dielectric sheet 18a.
- the copper foil of the part which is not covered with the resist is removed by performing an etching process with respect to copper foil. Thereafter, a resist solution is sprayed to remove the resist.
- the external terminals 16 and the reference ground conductors 22 as shown in FIG. 2 are formed on the surface of the dielectric sheet 18a by a photolithography process.
- the signal line 20 shown in FIG. It is formed on the back surface.
- a resist having the same shape as the signal line 20 shown in FIG. 2 is printed on the copper foil on the back surface of the dielectric sheet 18a using the external terminals 16a and 16b or the reference ground conductor 22 as positioning marks.
- the copper foil of the part which is not covered with the resist is removed by performing an etching process with respect to copper foil. Thereafter, the resist is removed.
- the signal line 20 is formed on the back surface of the dielectric sheet 18a by a photolithography process.
- the external terminals 16a and 16b and the reference ground conductor 22 and the signal line 20 are connected in the same process. You may form simultaneously. Further, after forming the signal line 20, the external terminals 16a and 16b and the reference ground conductor 22 may be formed using the signal line 20 as a positioning mark.
- the auxiliary ground conductor 24 shown in FIG. 2 is formed on the back surface of the dielectric sheet 18b by patterning the copper foil formed on the back surface of the dielectric sheet 18b. Specifically, a resist having the same shape as the auxiliary ground conductor 24 shown in FIG. 2 is printed on the copper foil on the back surface of the dielectric sheet 18b. And the copper foil of the part which is not covered with the resist is removed by performing an etching process with respect to copper foil. Thereafter, the resist is removed. Thus, the auxiliary ground conductor 24 as shown in FIG. 2 is formed on the back surface of the dielectric sheet 18b by a photolithography process.
- the dielectric element body 12 is formed by stacking the dielectric sheet 18a, the adhesive layer 19, and the dielectric sheet 18b in this order from the positive direction side to the negative direction side in the z-axis direction. Then, by applying heat and pressure to the dielectric sheet 18a, the adhesive layer 19 and the dielectric sheet 18b from the positive side and the negative side in the z-axis direction, the adhesive layer 19 is softened, and the dielectric sheet 18a The adhesive layer 19 and the dielectric sheet 18b are integrated.
- a protective layer 14 covering the reference ground conductor 22 is formed on the surface of the dielectric sheet 18a by applying a resin (resist) paste by screen printing. Further, a protective layer 15 covering the auxiliary ground conductor 24 is formed on the back surface of the dielectric sheet 18b by applying a resin (resist) paste by screen printing.
- the through holes h1 to h4 are irradiated by irradiating the laser beam to the positions where the through holes T1 to T4 of the dielectric sheet 18a, the adhesive layer 19, and the dielectric sheet 18b are formed. (Only through-holes h3 and h4 are shown).
- Ni / Au plating is performed to fill the through holes h1 to h4 with metal to form through holes T1 to T4.
- Ni / Au plating films are also formed on the surfaces of the external terminals 16a and 16b and the terminal portions 22b and 22c.
- the connectors 100a and 100b are mounted on the external terminals 16a and 16b on the connection parts 12b and 12c and the terminal parts 22b and 22c by using solder. Thereby, the laminated flat cable 10 shown in FIG. 1 is obtained.
- the laminated flat cable 10 configured as described above and the manufacturing method thereof, it is possible to suppress the occurrence of variations in the characteristic impedance of the signal line 20. More specifically, when the multilayer flat cable 10 is designed, the characteristic impedance of the signal line 20 in the state where the reference ground conductor 22 is present and the auxiliary ground conductor 24 is not present is higher than a predetermined characteristic impedance (for example, 50 ⁇ ). As described above, the distance between the signal line 20 and the reference ground conductor 22 is designed.
- a predetermined characteristic impedance for example, 50 ⁇
- the shape of the opening 30 of the auxiliary ground conductor 24 and the signal line 20 and the auxiliary ground conductor are set so that the characteristic impedance of the signal line 20 with the auxiliary ground conductor 24 added becomes a predetermined characteristic impedance (for example, 50 ⁇ ). 24 is designed.
- the characteristic impedance of the signal line 20 in the state where the reference ground conductor 22 exists and the auxiliary ground conductor 24 does not exist is determined by the distance between the signal line 20 and the reference ground conductor 22. Therefore, the laminated flat cable 10 is required to be manufactured so that the distance between the signal line 20 and the reference ground conductor 22 becomes a design value.
- the signal line 20 is formed on the back surface of the dielectric sheet 18a.
- the reference ground conductor 22 provided with the opening 30 is formed on the surface of the dielectric sheet 18a. That is, the signal line 20 and the reference ground conductor 22 are formed on both main surfaces of the same dielectric sheet 18a.
- the distance between the signal line 20 and the reference ground conductor 22 is maintained at the thickness of the dielectric sheet 18a. That is, by designing the laminated flat cable 10 so that the dielectric sheet 18a after lamination has the design value, the distance between the signal line 20 and the reference ground conductor 22 can be made closer to the design value. As a result, the occurrence of variations in the characteristic impedance of the signal line 20 can be suppressed.
- the distance between the signal line 20 and the reference ground conductor 22 can be brought close to the design value with high accuracy. More specifically, when a dielectric sheet is pressure-bonded without using an adhesive layer, the dielectric sheet softens, and therefore the distance between the signal line and the reference ground varies depending on heat treatment conditions and pressure conditions. . On the other hand, in the laminated flat cable 10 and the manufacturing method thereof, since the adhesive layer 19 is used, the dielectric sheet 18a is not greatly softened. As a result, the distance between the signal line 20 and the reference ground conductor 22 can be brought close to the design value with high accuracy. This is because the adhesive layer 19 bonds (bonds) the dielectric sheet 18a and the dielectric sheet 18b in a state where the dielectric sheet 18a is not substantially softened.
- the signal line 20 and the reference ground conductor 22 are formed on both main surfaces of the dielectric sheet 18a. For this reason, the positional accuracy of the signal line 20 and the reference ground conductor 22 is determined by the processing accuracy of the photolithography process. Since the processing accuracy of the photolithography process is generally very high, the positional accuracy of the signal line 20 and the reference ground conductor 22 is also very high. As a result, the occurrence of misalignment between the signal line 20 and the reference ground conductor 22 is suppressed.
- the signal line 20 is formed on the back surface of the dielectric sheet 18a.
- the external terminals 16a and 16b are formed on the surface of the dielectric sheet 18a. That is, the signal line 20 and the external terminals 16a and 16b are formed on both main surfaces of the same dielectric sheet 18a. For this reason, the positional accuracy of the external terminals 16a and 16b and the signal line 20 is determined by the processing accuracy of the photolithography process.
- the positional accuracy of the external terminals 16a and 16b and the signal line 20 is also very high. Further, when the dielectric sheet 18a, the adhesive layer 19 and the dielectric sheet 18b are laminated, a laminating deviation occurs between the dielectric sheet 18a and the dielectric sheet 18b, so that the signal line 20 and the external terminals 16a and 16b are separated. Occurrence of misalignment between them is suppressed. As a result, disconnection between the signal line 20 and the external terminals 16a and 16b and the characteristic impedance between the signal line 20 and the external terminals 16a and 16b are prevented from deviating from a predetermined characteristic impedance.
- the laminated flat cable 10 since the plurality of openings 30 are provided in the auxiliary ground conductor 24, the laminated flat cable 10 can be easily bent.
- the laminated flat cable 10 it is possible to suppress the characteristic impedance of the signal line 20 from deviating from a predetermined characteristic impedance (for example, 50 ⁇ ).
- a predetermined characteristic impedance for example, 50 ⁇
- the surface of the dielectric body 12 positioned on the reference ground conductor 22 side with respect to the signal line 20 is in contact with the battery pack 206. That is, a solid reference ground conductor 22 is provided between the signal line 20 and the battery pack 206 instead of the auxiliary ground conductor 24 provided with the opening 30.
- the occurrence of electromagnetic coupling between the signal line 20 and the battery pack 206 is suppressed.
- the characteristic impedance of the signal line 20 is suppressed from deviating from the predetermined characteristic impedance.
- the dielectric element body 12 can be thinned. More specifically, the auxiliary ground conductor 24 is provided with an opening 30. The signal line 20 overlaps the opening 30. Thereby, it is difficult to form a capacitance between the signal line 20 and the auxiliary ground conductor 24. Therefore, the signal line 20 and the auxiliary ground conductor 24 can be brought close to each other while the characteristic impedance of the signal line 20 is maintained at a predetermined characteristic impedance (for example, 50 ⁇ ). As a result, the laminated flat cable 10 can be thinned. When the thickness of the laminated flat cable 10 is reduced, the laminated flat cable 10 can be easily bent.
- a predetermined characteristic impedance for example, 50 ⁇
- the auxiliary ground conductor 24 is covered with the protective layer 15. Thereby, the auxiliary ground conductor 24 is not exposed on the back surface of the dielectric body 12. Therefore, even if another article is disposed on the back surface of the dielectric element body 12, the auxiliary ground conductor 24 and the other article do not directly face each other, so that fluctuations in the characteristic impedance of the signal line 20 are suppressed.
- FIG. 10 is an exploded view of the dielectric body 12 of the laminated flat cable 10a according to the first modification.
- the laminated flat cable 10a is different from the laminated flat cable 10 in that dielectric sheets 18c and 18d and adhesive layers 19a and 19b are provided instead of the protective layers 14 and 15.
- an adhesive layer 19a is laminated on the positive side of the dielectric sheet 18a in the z-axis direction. Further, a dielectric sheet 18c is laminated on the positive side of the adhesive layer 19a in the z-axis direction. Openings Ha to Hh provided in the protective layer 14 are provided in the dielectric sheet 18c and the adhesive layer 19a. As a result, the external terminals 16a and 16b and the terminal portions 22b and 22c are exposed.
- an adhesive layer 19b is laminated on the negative side of the dielectric sheet 18b in the z-axis direction. Further, a dielectric sheet 18d is laminated on the negative side of the adhesive layer 19b in the z-axis direction.
- the laminated flat cable 10 a configured as described above can achieve the same effects as the laminated flat cable 10.
- the dielectric sheets 18c and 18d made of polyimide or liquid crystal polymer have higher strength than the protective layers 14 and 15 made of resist material. Therefore, according to the laminated flat cable 10a, the strength of the dielectric body 12 is improved.
- FIG. 11 is a cross-sectional structure diagram of the laminated flat cable 10b according to the first modification.
- the laminated flat cable 10b is different from the laminated flat cable 10 in the structure of the through holes T1 to T4. More specifically, in the laminated flat cable 10b, the through holes T1 to T4 are not filled with conductors and have a hollow structure. The through holes T1 to T4 are configured by covering the inner peripheral surface of the through hole with a metal film formed by plating.
- the through holes T1 to T4 of the laminated flat cable 10b are more easily deformed than the through holes T1 to T4 of the laminated flat cable 10. Therefore, the laminated flat cable 10b can be deformed more easily than the laminated flat cable 10.
- FIG. 12 is a plan view of the signal line 20 and the auxiliary ground conductor 24 of the laminated flat cable 10c as seen from the lamination direction.
- the laminated flat cable 10 c is different from the laminated flat cable 10 in the shape of the signal line 20 and the opening 30.
- the opening 30 is tapered in the region A3. Further, the line width W11 of the signal line 20 in the region A1 is larger than the line width W12 of the signal line 20 in the region A2. In the region A3, the signal line 20 has a tapered shape in which the line width becomes narrower as the region A2 is approached.
- the distance between the signal line 20 and the reference ground conductor 22 in the region A3 gradually decreases as the region A1 approaches the region A2. Therefore, the capacitance formed between the signal line 20 and the reference ground conductor 22 in the region A3 gradually increases as the region A1 approaches the region A2. As a result, the characteristic impedance Z3 of the signal line 20 in the region A3 is suppressed from abruptly changing, and reflection of high-frequency signals in the signal line 20 is suppressed.
- the line width W12 of the signal line 20 in the region A2 is smaller than the line width W11 of the signal line 20 in the region A1. Therefore, it is possible to suppress the capacitance formed between the signal line 20 and the bridge portion 60 from becoming too large. As a result, the characteristic impedance Z2 of the signal line 20 in the region A2 is suppressed from becoming too small.
- FIG. 13 is an exploded view of the dielectric element body 12 of the laminated flat cable 10d according to the fourth modification.
- the laminated flat cable 10d is different from the laminated flat cable 10 in that the adhesive layer 19 is not provided. Therefore, the dielectric sheet 18a and the dielectric sheet 18b are laminated so that the back surface of the dielectric sheet 18a and the surface of the dielectric sheet 18b are in contact with each other.
- the heat treatment is performed when the dielectric sheets 18a and 18b are stacked, so that the back surface of the dielectric sheet 18a and the surface of the dielectric sheet 18b are softened and melted to bond the dielectric sheets 18a and 18b. .
- via hole conductors B1 to B6 are provided instead of the through holes T1 to T4. More specifically, the via-hole conductor B1 passes through the dielectric sheet 18a in the z-axis direction, and connects the external terminal 16a and the end of the signal line 20 on the negative direction side in the x-axis direction. The via-hole conductor B2 passes through the dielectric sheet 18a in the z-axis direction, and connects the external terminal 16b and the end of the signal line 20 on the positive direction side in the x-axis direction.
- the via-hole conductor B3 passes through the line portion 18a-a of the dielectric sheet 18a in the z-axis direction, and is provided on the positive direction side in the y-axis direction with respect to the signal line 20.
- the via-hole conductor B5 passes through the line portion 18b-a of the dielectric sheet 18b in the z-axis direction, and is provided on the positive direction side in the y-axis direction with respect to the signal line 20.
- the via-hole conductors B3 and B5 constitute one via-hole conductor by being connected to each other, and connect the reference ground conductor 22 and the auxiliary ground conductor 24.
- the via-hole conductor B4 passes through the line portion 18a-a of the dielectric sheet 18a in the z-axis direction and is provided on the negative direction side in the y-axis direction with respect to the signal line 20.
- the via-hole conductor B6 passes through the line portion 18b-a of the dielectric sheet 18b in the z-axis direction, and is provided on the negative direction side in the y-axis direction with respect to the signal line 20.
- the via-hole conductors B4 and B6 constitute one via-hole conductor by being connected to each other, and connect the reference ground conductor 22 and the auxiliary ground conductor 24.
- the laminated flat cable 10 d configured as described above can achieve the same effects as the laminated flat cable 10.
- the dielectric element body 12 can be thinned.
- the via hole conductors B1 to B6 can be used instead of the through holes T1 to T4. Therefore, the via-hole conductors B1 to B6 are not exposed on the surface of the laminated flat cable 10d. As a result, corrosion of the via-hole conductors B1 to B6 is suppressed. Further, when the external terminals 16a and 16b are plated, the via-hole conductors B1 to B6 are suppressed from being melted by the plating solution.
- the laminated flat cable according to the present invention is not limited to the laminated flat cables 10, 10a to 10d, and can be changed within the scope of the gist thereof.
- the protective layers 14 and 15 are formed by screen printing, but may be formed by a photolithography process.
- the reference ground conductor 22 is a solid conductor. However, the reference ground conductor 22 may be provided with an opening. However, the area of the opening provided in the reference ground conductor 22 is smaller than the area of the opening provided in the auxiliary ground conductor 24.
- the auxiliary ground conductor 24 may be formed on the surface of the dielectric sheet 18b.
- the present invention is useful for a laminated flat cable and a method for manufacturing the same, and is particularly excellent in that variation in characteristic impedance of a signal line can be suppressed.
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Abstract
Description
以下に、本発明の一実施形態に係る高周波信号線路の構成について図面を参照しながら説明する。図1は、本発明の一実施形態に係る積層型フラットケーブル10の外観斜視図である。図2は、図1の積層型フラットケーブル10の誘電体素体12の分解図である。図3は、図1の積層型フラットケーブル10の断面構造図である。図4は、積層型フラットケーブル10の断面構造図である。図5は、積層型フラットケーブル10の信号線路20及び補助グランド導体24を積層方向から平面視した図である。図1ないし図5において、積層型フラットケーブル10の積層方向をz軸方向と定義する。また、積層型フラットケーブル10の長手方向をx軸方向と定義し、x軸方向及びz軸方向に直交する方向をy軸方向と定義する。
以下に、積層型フラットケーブル10の製造方法について図2及び図9を参照しながら説明する。図9は、積層型フラットケーブル10の製造時の工程断面図である。以下では、一つの積層型フラットケーブル10が作製される場合を例にとって説明するが、実際には、大判の誘電体シートが積層及びカットされることにより、同時に複数の積層型フラットケーブル10が作製される。
以上のように構成された積層型フラットケーブル10及びその製造方法によれば、信号線路20の特性インピーダンスにばらつきが発生することを抑制できる。より詳細には、積層型フラットケーブル10の設計時には、基準グランド導体22が存在し補助グランド導体24が存在しない状態における信号線路20の特性インピーダンスが所定の特性インピーダンス(例えば、50Ω)よりも高くなるように、信号線路20と基準グランド導体22との間隔の設計を行う。次に、補助グランド導体24を追加した状態における信号線路20の特性インピーダンスが所定の特性インピーダンス(例えば、50Ω)となるように、補助グランド導体24の開口30の形状及び信号線路20と補助グランド導体24との間隔の設計を行う。
以下に、第1の変形例に係る積層型フラットケーブルの構成について図面を参照しながら説明する。図10は、第1の変形例に係る積層型フラットケーブル10aの誘電体素体12の分解図である。
以下に、第2の変形例に係る積層型フラットケーブルの構成について図面を参照しながら説明する。図11は、第1の変形例に係る積層型フラットケーブル10bの断面構造図である。
以下に、第3の変形例に係る積層型フラットケーブルの構成について図面を参照しながら説明する。図12は、積層型フラットケーブル10cの信号線路20及び補助グランド導体24を積層方向から平面視した図である。
以下に、第4の変形例に係る積層型フラットケーブルの構成について図面を参照しながら説明する。図13は、第4の変形例に係る積層型フラットケーブル10dの誘電体素体12の分解図である。
本発明に係る積層型フラットケーブルは、積層型フラットケーブル10,10a~10dに限らず、その要旨の範囲内において変更可能である。
T1~T4 スルーホール
10,10a~10d 積層型フラットケーブル
12 誘電体素体
14,15 保護層
16a,16b 外部端子
18a~18d 誘電体シート
19,19a,19b 接着層
20 信号線路
22 基準グランド導体
24 補助グランド導体
30 開口
60 ブリッジ部
100a,100b コネクタ
Claims (13)
- 第1の主面及び第2の主面を有する第1の基材層及び第3の主面及び第4の主面を有する第2の基材層が該第2の主面と該第3の主面とが対向するように積層されてなる積層体と、
高周波信号が伝送される信号線路であって、前記第2の主面上に形成されている信号線路と、
前記第1の主面上に形成され、かつ、前記信号線路と対向している基準グランド導体と、
前記第3の主面上又は前記第4の主面上に形成され、かつ、前記信号線路と対向している補助グランド導体と、
を備えており、
前記補助グランド導体には、前記信号線路に沿って並んでいる複数の開口が設けられていること、
を特徴とする積層型フラットケーブル。 - 積層方向から平面視したときに、前記信号線路の一端と重なっている外部端子であって、前記第1の主面上に形成されている外部端子と、
前記信号線路と前記外部端子とを接続し、かつ、前記第1の基材層を積層方向に貫通している層間接続部を、
更に備えていること、
を特徴とする請求項1に記載の積層型フラットケーブル。 - 前記積層体は、前記第1の基材層と前記第2の基材層とを接着する接着層を更に有していること、
を特徴とする請求項1又は請求項2のいずれかに記載の積層型フラットケーブル。 - 前記補助グランド導体は、前記第4の主面上に形成されており、
前記第1の基材層と前記第2の基材層とは、前記第2の主面と前記第3の主面とが接触するように積層されていること、
を特徴とする請求項1又は請求項2のいずれかに記載の積層型フラットケーブル。 - 前記第1の基材層の厚さは、前記第2の基材層の厚さよりも大きいこと、
を特徴とする請求項1ないし請求項4のいずれかに記載の積層型フラットケーブル。 - 前記基準グランド導体は、ベタ状の導体であること、
を特徴とする請求項1ないし請求項5のいずれかに記載の積層型フラットケーブル。 - 第1の基材層の第1の主面上に基準グランド導体を形成する第1の工程と、
前記第1の基材層の第2の主面上に、該第2の主面の法線方向から平面視したときに、前記基準グランド導体と重なる信号線路を形成する第2の工程と、
第2の基材層の第3の主面上又は第4の主面上に、複数の開口が設けられた補助グランド導体を形成する第3の工程と、
前記複数の開口が前記信号線路に沿って並び、かつ、前記第2の主面と前記第3の主面とが対向するように、前記第1の基材層と前記第2の基材層とを積層する第4の工程と、
を備えていること、
を特徴とする積層型フラットケーブルの製造方法。 - 前記第1の工程では、前記第1の主面の法線方向から平面視したときに、前記信号線路の一端と重なっている外部端子を該第1の主面上に形成すること、
を特徴とする請求項7に記載の積層型フラットケーブルの製造方法。 - 前記第4の工程では、前記第1の基材層と前記第2の基材層とを接着層によって接着し、
前記積層型フラットケーブルの製造方法は、
前記信号線路と前記外部端子とを接続し、かつ、前記第1の基材層、前記第2の基材層及び前記接着層を積層方向に貫通するスルーホールを形成する第5の工程を、
更に備えていること、
を特徴とする請求項8に記載の積層型フラットケーブルの製造方法。 - 前記第3の工程では、前記第4の主面上に前記補助グランド導体を形成し、
前記第4の工程では、前記第2の主面と前記第3の主面とが接触するように前記第1の基材層と前記第2の基材層とを積層し、
前記積層型フラットケーブルの製造方法は、
前記第4の工程の後に、前記信号線路と前記外部端子とを接続し、かつ、前記第1の基材層を積層方向に貫通するスルーホールを形成する第5の工程を、
更に備えていること、
を特徴とする請求項8に記載の積層型フラットケーブルの製造方法。 - 前記外部端子上にコネクタを実装する第6の工程を、
更に備えていること、
を特徴とする請求項8ないし請求項10のいずれかに記載の積層型フラットケーブルの製造方法。 - 前記第1の基材層の厚さは、前記第2の基材層の厚さよりも大きいこと、
を特徴とする請求項7ないし請求項11のいずれかに記載の積層型フラットケーブルの製造方法。 - 前記基準グランド導体は、ベタ状の導体であること、
を特徴とする請求項7ないし請求項12のいずれかに記載の積層型フラットケーブルの製造方法。
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH039502U (ja) * | 1989-06-12 | 1991-01-29 | ||
JPH08242117A (ja) * | 1995-03-03 | 1996-09-17 | Murata Mfg Co Ltd | アンテナ一体型ストリップラインケーブル |
JP2007123740A (ja) * | 2005-10-31 | 2007-05-17 | Sony Corp | フレキシブル基板、光送受信モジュール及び光送受信装置 |
WO2012074100A1 (ja) * | 2010-12-03 | 2012-06-07 | 株式会社村田製作所 | 高周波信号線路 |
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US6414573B1 (en) * | 2000-02-16 | 2002-07-02 | Hughes Electronics Corp. | Stripline signal distribution system for extremely high frequency signals |
JP2005317631A (ja) * | 2004-04-27 | 2005-11-10 | Alps Electric Co Ltd | 電子回路基板 |
WO2011007660A1 (ja) * | 2009-07-13 | 2011-01-20 | 株式会社村田製作所 | 信号線路及び回路基板 |
JP3173143U (ja) | 2010-12-03 | 2012-01-26 | 株式会社村田製作所 | 高周波信号線路 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH039502U (ja) * | 1989-06-12 | 1991-01-29 | ||
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JP2007123740A (ja) * | 2005-10-31 | 2007-05-17 | Sony Corp | フレキシブル基板、光送受信モジュール及び光送受信装置 |
WO2012074100A1 (ja) * | 2010-12-03 | 2012-06-07 | 株式会社村田製作所 | 高周波信号線路 |
Cited By (2)
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---|---|---|---|---|
JP2017028707A (ja) * | 2014-02-04 | 2017-02-02 | 株式会社村田製作所 | 高周波信号伝送線路及び電子機器 |
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