WO2023248537A1 - 回転コネクタ - Google Patents

回転コネクタ Download PDF

Info

Publication number
WO2023248537A1
WO2023248537A1 PCT/JP2023/007309 JP2023007309W WO2023248537A1 WO 2023248537 A1 WO2023248537 A1 WO 2023248537A1 JP 2023007309 W JP2023007309 W JP 2023007309W WO 2023248537 A1 WO2023248537 A1 WO 2023248537A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulating layer
fpc
layer
signal conductor
stator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/007309
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
俊晃 朝倉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alps Alpine Co Ltd
Original Assignee
Alps Alpine Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alps Alpine Co Ltd filed Critical Alps Alpine Co Ltd
Priority to JP2024528287A priority Critical patent/JPWO2023248537A1/ja
Priority to CN202380047710.7A priority patent/CN119404390A/zh
Publication of WO2023248537A1 publication Critical patent/WO2023248537A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R35/00—Flexible or turnable line connectors, i.e. the rotation angle being limited
    • H01R35/04—Turnable line connectors with limited rotation angle with frictional contact members
    • 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
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields

Definitions

  • the present disclosure relates to a rotary connector.
  • rotary connectors have been known that electrically connect an electrical device provided on the steering wheel side and an electrical device provided on the vehicle body side.
  • EMC electromagnetic compatibility
  • a twisted pair flat cable comprising an insulator, wherein the insulator is twisted together with the plurality of conductors by folding back at a predetermined interval to form a twisted pair structure, is used for a steering roll connector (rotary connector). It has been known. (For example, see Patent Document 1). It is also known to provide a shield member on one side of a flat cable to block and absorb electromagnetic waves. (See FIG. 6(b) of Patent Document 1)
  • the impedance of the signal wiring is affected.
  • adjusting the thickness of the insulating resin layer between the shield layer and the signal wiring in order to obtain optimal impedance characteristics may affect the elasticity of the entire cable, making it difficult to deform.
  • the bending resistance bending durability
  • a rotary connector includes a stator having a first external connection part, a rotor having a second external connection part and arranged to be rotatable relative to the stator, the stator and the rotor having a second external connection part.
  • a flexible cable that is housed in an annular space between the rotor and has both ends respectively connected to the first external connection part of the stator and the second external connection part of the rotor; , a first insulating layer, a second insulating layer, a signal conductor formed between the first insulating layer and the second insulating layer, and a side opposite to the signal conductor with respect to the first insulating layer. and a shield layer stacked on the substrate, the first insulating layer being thicker than the second insulating layer.
  • FIG. 1 is an external perspective view of a rotary connector 100 according to an embodiment.
  • FIG. 2 is an exploded perspective view of the rotary connector 100 shown in FIG. 1.
  • FIG. 3 is an enlarged perspective view of peripheral components of the FPC 110 shown in FIG. 2.
  • FIG. FIG. 2 is a perspective view of an FPC 110, a lead block, etc.;
  • FIG. 3 is an external perspective view of the FPC 110 held by the holder 7.
  • FIG. FIG. 3 is an external perspective view of the annular space S in a state where the FPC 110 is not accommodated.
  • It is a figure which shows an example of the cross-sectional structure of FPC for comparison.
  • FIG. 3 is a cross-sectional view showing an example of the cross-sectional structure of FPC of an embodiment.
  • FIG. 3 is a cross-sectional view showing a state in which FPCs according to an embodiment are overlapped.
  • FIG. 2 is a cross-sectional view showing a bent state of the FPC of the embodiment
  • FIG. 1 is an external perspective view of the rotary connector 100 of the embodiment
  • FIG. 2 is an exploded perspective view of the rotary connector 100 shown in FIG. 1
  • FIG. 3 is an enlarged perspective view of peripheral components of the FPC 110 shown in FIG. 2
  • FIG. 5 is an external perspective view of the FPC 110, lead block, etc.
  • FIG. 5 is an external perspective view of the FPC 110 held by the holder 7
  • FIG. 6 is an external perspective view of the annular space S without the FPC 110 accommodated therein.
  • the rotary connector 100 includes a stator 2 and a rotor 3 rotatably connected to the stator 2.
  • the FPC 110 is housed in a wound state.
  • Lead blocks 11 and 21 are connected to connection terminal portions 110a and 110b (see FIG. 2) at both ends of the FPC 110.
  • the stator 2 has a lead block 11 and the rotor 3 has a lead block 21.
  • the lead block 11 is an example of a first external connection part provided on the stator 2 side
  • the lead block 21 is an example of a second external connection part provided on the rotor 3 side.
  • a holder 7 is rotatably arranged between the stator 2 and the rotor 3.
  • the rotary connector 100 is used by being assembled into a steering device of an automobile, and is used to connect an electrical connection between a stator 2 installed in a steering column (not shown) of a vehicle and a rotor 3 connected to a steering wheel (not shown). The connection is made using the FPC 110.
  • the stator 2 is generally composed of an outer cylinder 8 and a bottom plate member 9 made of synthetic resin, and the substantially cylindrical outer cylinder 8 is integrated with the outer peripheral edge of the substantially annular bottom plate member 9 by snap coupling. ing.
  • a connecting portion 8a is provided at a predetermined location on the outer circumferential side of the outer cylinder 8, and a connecting portion 9a that is combined with the connecting portion 8a is integrally formed at a predetermined location on the outer circumferential side of the bottom plate member 9.
  • the combination of the connecting portion 8a, the cylindrical case 8b, and the connecting portion 9a constitutes a fixed side connecting portion 50 that accommodates the lead block 11.
  • the rotor 3 has an upper rotor 13 and a lower rotor 15 made of synthetic resin, and the upper rotor 13 and the lower rotor 15 are integrated by a snap connection.
  • the upper rotor 13 has an annular top plate portion 13a facing the bottom plate member 9, and an inner cylindrical body 13b hanging down from the center of the top plate portion 13a.
  • the inner diameter of the inner cylindrical body 13b is set to a size that allows a steering shaft (not shown) to be inserted therethrough.
  • the top plate portion 13a of the upper rotor 13 is integrally formed with a rotation side connecting portion 13d that accommodates the lead block 21. Further, the outer peripheral edge of the top plate portion 13a is slidably engaged with the outer cylinder body 8.
  • the lead blocks 11 and 21 are used as the first external connection part and the second external connection part, respectively, of the rotary connector 100 for electrically connecting to the steering wheel side or the vehicle side.
  • Any other configuration may be used as long as it can be electrically connected to the steering wheel side or the vehicle side, such as directly connecting a cable from the outside to the first external connection part and the second external connection part of the rotary connector 100.
  • the lower rotor 15 is formed into a substantially cylindrical shape through which the steering shaft can be inserted, and is snap-coupled to the inner cylindrical body 13b of the upper rotor 13.
  • the rotor 3 is rotatably connected to the stator 2.
  • the FPC 110 is a flexible printed circuit board, and has a configuration in which a strip-shaped conductor is covered with an insulating film made of polyimide or the like.
  • Flexible printed circuit boards can be microfabricated, and the number of signal lines per unit width can be increased compared to flat cables in which conductive wires are coated with laminated resin.
  • the FPC 110 is housed in an annular space S (see FIG. 6) formed between the outer cylindrical body 8 and the inner cylindrical body 13b so that it can be rolled up and unwound.
  • the FPC 110 has a folded part 110c that is folded back by the roller 23 between the connecting terminal parts 110a and 110b located at both ends in the annular space S (see FIGS. 3 to 5).
  • the FPC 110 has its winding direction reversed by the folded portion 110c.
  • the FPC 110 is wound within the annular space S (see FIG. 6), so that some sections overlap. More specifically, for example, on the inner peripheral side (the part indicated by arrow A) of the folded portion 110c shown in FIG. 3, the FPCs 110 wound around the inner cylinder 13b closely overlap each other. Similarly, on the outer peripheral side (the part indicated by arrow B) of the folded portion 110c shown in FIG. 3, the FPCs 110 wound along the cylindrical shape of the outer cylinder 8 are closely overlapped with each other.
  • the length of the FPC 110 (the length between the connection terminal parts 110a and 110b at both ends) ) is allowed some leeway. Therefore, in the portion where the FPCs 110 overlap, they do not completely adhere to each other as in the case where the overlapped FPCs 110 are adhered to each other, but overlap so gently that a thin air layer exists between them.
  • FPC 110 and the other FPC may be provided.
  • FPC 110 and the other FPC are provided, if the two FPCs are overlapped, reversed at the folded part, and wound on the inner or outer circumferential side of the folded part, FPC 110 and the other FPC can be installed. Even when one FPC is overlapped with each other in the annular space S, it can be accommodated in an operable manner. At this time, by making the length of the other FPC different from the length of the FPC 110 and shifting the folded position, it is possible to accommodate the FPC more smoothly and stably. The same applies when three or more FPCs are provided.
  • other FPCs of one FPC 110 include a flexible substrate that is composed of only an insulating layer and has approximately the same size as the FPC 110, and a flexible substrate that has approximately the same size as the FPC 110.
  • a flexible substrate provided with a shield layer, etc. may be provided in an overlapping manner.
  • a connecting terminal portion 110a at one longitudinal end of the FPC 110 is electrically connected to a lead block 11 attached to the stator 2, and a connecting terminal portion 110b at the other longitudinal end is electrically connected to a lead block 21 attached to the rotor 3. electrically connected to.
  • electrical connection means that a signal is connected between the connection terminal section 110a and the lead block 11 or between the connection terminal section 110b and the lead block 21 to process and control electrical signals passing through the lead blocks 11, 21 or the FPC 110. This also includes cases where a processing section, a control section, etc. are provided.
  • the holder 7 includes an annular flat plate portion 7a rotatably mounted on a bottom plate member 9 within an annular space S, and a plurality of support shafts 7b erected on the annular flat plate portion 7a. , and a guide wall portion 7c.
  • a roller 23 is rotatably supported on each support shaft 7b, and as shown in FIG. At the folded portion 110c, the winding direction of the FPC 110 is reversed midway.
  • the holder 7 is rotatably provided with respect to the stator 2 and rotor 3, and when the rotor 3 rotates relative to the stator 2, the holder 7 also rotates around the axes of the stator 2 and rotor 3. do.
  • the lead block 11 is held by a block holder 71, and is connected to a connecting terminal portion 110a at the other end of the FPC 110 via wiring (not shown) fixed to the block holder 71. It is connected to the.
  • the lead block 21 is held by a block holder 91, and is connected to the connection terminal portion 110b of the FPC 110 via wiring (not shown) fixed to the block holder 91. ing. Thereby, electrical connection between the lead block 11 of the stator 2 and the lead block 21 of the rotor 3 is maintained via the FPC 110.
  • the wiring electrically connecting the lead block 11 and the connecting terminal portion 110a, and the lead block 21 and the connecting terminal portion 110b are connected, for example, by short flexible cables such as FPC held by the block holders 71 and 91, respectively. You can.
  • FIG. 7 is a diagram showing an example of the cross-sectional structure of the FPC 1 for comparison. Note that the FPC 1 for comparison is not a conventional technology.
  • the comparative FPC 1 has a long and narrow shape, has connection terminals at both ends, and is housed in the annular space S (see FIG. 6) in a wound state. It is possible.
  • the cross section shown in FIG. 7 is a cross section obtained by cutting the FPC 1 in a plane perpendicular to the longitudinal direction (direction connecting both ends) of the comparative FPC 1, and shows the portion where the signal conductor is located.
  • the elastic modulus of each layer will be expressed in Young's modulus (Gpa).
  • the comparative FPC 1 has a structure in which a shield film 1A, an insulating layer 1B, an adhesive layer 1C, a signal conductor 1D, an adhesive layer 1E, and an insulating layer 1F are laminated.
  • the shield film 1A is a layer in which, for example, a metal layer such as copper or silver or a metal mesh is formed on the surface of an insulating layer.
  • the shield film 1A is laminated on the insulating layer 1B in order to stabilize the impedance of the signal conductor 1D in order to improve the signal transmission characteristics in the signal conductor 1D.
  • the thickness of the shield film 1A is, for example, 15 ⁇ m, and the elastic modulus is 0.8 Gpa.
  • the insulating layer 1B is, for example, an insulating film made of polyimide, and is laminated on the shield film 1A.
  • the insulating layer 1B may be made of a material other than polyimide as long as it can be wound.
  • the thickness of the insulating layer 1B is, for example, 25 ⁇ m, and the elastic modulus is 4.1 Gpa.
  • the adhesive layer 1C is an insulating layer made of an adhesive that adheres the insulating layer 1B and the signal conductor 1D.
  • the thickness of the adhesive layer 1C is, for example, 10 ⁇ m, and the elastic modulus is 4.3 Gpa.
  • the signal conductor 1D is, for example, a signal conductor in which a metal layer such as copper foil is etched into a pattern such as wiring.
  • the thickness of the signal conductor 1D is, for example, 35 ⁇ m, and the elastic modulus is 30 Gpa.
  • the adhesive layer 1E is an insulating layer made of an adhesive that bonds the signal conductor 1D and the insulating layer 1F.
  • the thickness of the adhesive layer 1E is, for example, 30 ⁇ m, and the elastic modulus is 1.2 Gpa.
  • the insulating layer 1F is, for example, an insulating film made of polyimide, like the insulating layer 1B.
  • the insulating layer 1F may be made of a material other than polyimide as long as it can be wound.
  • the thickness of the insulating layer 1F is, for example, 25 ⁇ m, and the elastic modulus is 4.1 Gpa.
  • Such a comparative FPC 1 is equipped with a shield film 1A and a signal conductor 1D in order to support high-speed digital signals transmitted by, for example, CAN (Controlled Area Network), which is an in-vehicle data communication network. It stabilizes impedance and shields noise.
  • CAN Controlled Area Network
  • the comparative FPC 1 has a configuration in which a shield film 1A is attached to an FPC that does not support high-speed digital signals.
  • the impedance of the signal conductor 1D in the comparison FPC 1 was 60 ⁇ .
  • the signal conductor 1D is treated as a pair of signal lines (two signal lines make up a set) for differential signals compatible with a two-wire differential voltage system, and a differential impedance model is used. was used.
  • the distance between the shield film 1A and the signal conductor 1D may be increased, but this means increasing the thickness of the insulating layer 1B between the shield film 1A and the signal conductor 1D.
  • the FPC 1 becomes difficult to bend at the folded portion that curves along the roller 23, and the stress applied to the FPC 1 increases when it is bent to a predetermined shape, making it more likely to be damaged as it is repeatedly bent.
  • the bending resistance of the FPC1 decreases.
  • a rotary connector 100 that can realize a stable desired impedance and includes an FPC 110 with high bending resistance is realized.
  • the configuration of the FPC 110 will be described below.
  • FIG. 8 is a diagram showing an example of a cross-sectional structure of the FPC 110.
  • the cross section shown in FIG. 8 is a cross section obtained by cutting the FPC 110 along a plane perpendicular to the longitudinal direction (direction connecting both ends) of the FPC 110, and shows a portion where the signal conductor 116 is located.
  • the vertical direction in FIG. 8 corresponds to the radial direction of the annular space S. Although the following explanation will be made using the vertical direction in FIG. 8, the vertical direction shown in FIG. 8 does not represent a universal vertical direction.
  • the FPC 110 includes a shield film 111, an insulating layer 112, an adhesive layer 113, an insulating layer 114, an adhesive layer 115, a signal conductor 116, an adhesive layer 117, and an insulating layer 118.
  • the shield film 111 is an example of a shield layer.
  • the insulating layer 112, adhesive layer 113, insulating layer 114, and adhesive layer 115 between the shield film 111 and the signal conductor 116 constitute a first insulating layer 110F.
  • the adhesive layer 117 and the insulating layer 118 are located on the opposite side of the signal conductor 116 from the first insulating layer 110F.
  • the adhesive layer 117 and the insulating layer 118 constitute a second insulating layer 110S.
  • the insulating layer on which the shield film 111 is provided with respect to the signal conductor 116 is the first insulating layer 110F
  • the insulating layer without the shield film 111 with respect to the signal conductor 116 is the second insulating layer 110S.
  • the first insulating layer 110F is thicker than the second insulating layer 110S. The reason for doing this will be described later using FIG. 9.
  • the insulating layers 112 and 114 are examples of two insulating layers included in the first insulating layer 110F.
  • the adhesive layer 113 that adheres the insulating layers 112 and 114 is an example of a bonding layer that connects the two insulating layers, and an adhesive layer may be used as another example.
  • connection terminal portions 110a and 110b are connected to lead blocks 11 and 21 (see FIGS. 2 to 4), respectively.
  • the shield film 111 is located inside the annular space S in the radial direction on the inner peripheral side of the folded portion 110c (the portion indicated by the arrow A in FIG. 3). Further, on the outer peripheral side of the folded portion 110c (the portion indicated by the arrow B in FIG. 3), the shield film 111 is located on the outside of the annular space S in the radial direction. In the folded portion 110c, the shield film 111 is on the outside. The reason for doing this will be described later using FIG. 9.
  • the shield film 111, the insulating layer 112, the adhesive layer 113, the insulating layer 114, the adhesive layer 115, the signal conductor 116, the adhesive layer 117, and the insulating layer 118 are laminated in this order.
  • the first insulating layer 110F including the insulating layer 112, the adhesive layer 113, the insulating layer 114, and the adhesive layer 115 is a base insulating layer that becomes the base of the FPC 110
  • the insulating layer 110S is a protective layer provided to protect the signal conductor 116.
  • the FPC 110 can be manufactured as follows. First, a metal foil for the signal conductor 116 is bonded onto the insulating layer 114 of the first insulating layer 110F as a base insulating layer using the adhesive layer 115. Next, patterning is performed by etching to form a signal conductor 116, and then an insulating layer 118 is bonded onto the signal conductor 116 with an adhesive layer 117. Then, it is turned upside down, and the insulating layer 112 is adhered to the insulating layer 114 using the adhesive layer 113, and finally the shield film 111 is attached to the insulating layer 112. As an example, the FPC 110 can be manufactured using such a manufacturing process. Note that the manufacturing process may be performed in a different process depending on the material, ease of manufacturing, etc.
  • the shield film 111 is a layer in which, for example, a metal layer such as copper or silver or a metal mesh is formed on the surface of an insulating layer.
  • the shield film 111 is laminated on the lower surface side of the insulating layer 112 in order to stabilize the impedance of the signal conductor 116 in order to improve the signal transmission characteristics in the signal conductor 116 and to shield noise.
  • the thickness of the shield film 111 is, for example, 15 ⁇ m, and the elastic modulus is 0.8 Gpa.
  • the insulating layer 112 is, for example, an insulating film made of polyimide.
  • the insulating layer 112 may be made of a material other than polyimide as long as it can be wound.
  • the thickness of the insulating layer 112 is, for example, 12.5 ⁇ m, and the elastic modulus is 4.1 Gpa.
  • the adhesive layer 113 is an insulating layer made of an adhesive that bonds the insulating layer 112 and the insulating layer 114 together.
  • the thickness of the adhesive layer 113 is, for example, 30 ⁇ m, and the elastic modulus is 1.2 Gpa.
  • the insulating layer 114 is, for example, an insulating film made of polyimide.
  • the insulating layer 114 may be made of a material other than polyimide as long as it can be wound.
  • the thickness of the insulating layer 114 is, for example, 25 ⁇ m, and the elastic modulus is 4.1 Gpa.
  • the adhesive layer 115 is an insulating layer made of an adhesive that adheres the insulating layer 114 and the signal conductor 116.
  • the thickness of the adhesive layer 115 is, for example, 10 ⁇ m, and the elastic modulus is 4.3 Gpa.
  • an epoxy adhesive or the like is used for the adhesive layer 115.
  • the signal conductor 116 is, for example, a signal conductor formed by etching a metal layer such as copper foil into a pattern such as wiring.
  • the signal conductor 116 is compatible with a two-wire differential voltage system, and includes a pair of signal lines (two signal lines make up a set) for differential signals.
  • the thickness of the signal conductor 116 is, for example, 35 ⁇ m, and the elastic modulus is 30 Gpa.
  • the adhesive layer 117 is an insulating layer made of an adhesive that bonds the signal conductor 116 and the insulating layer 118.
  • the thickness of the adhesive layer 117 is, for example, 30 ⁇ m, and the elastic modulus is 1.2 Gpa.
  • an acrylic adhesive, an epoxy adhesive, or the like is used for the adhesive layers 113 and 117.
  • the insulating layer 118 is, for example, an insulating film made of polyimide.
  • the insulating layer 118 may be made of a material other than polyimide as long as it can be wound.
  • the thickness of the insulating layer 118 is, for example, 12.5 ⁇ m, and the elastic modulus is 4.1 Gpa.
  • the total thickness of the insulating layer 112, the adhesive layer 113, the insulating layer 114, and the adhesive layer 115 as the first insulating layer 110F is 77.5 ⁇ m, and the adhesive layer 117 as the second insulating layer 110S Since the total thickness of the insulating layer 118 is 42.5 ⁇ m, the first insulating layer 110F is thicker than the second insulating layer 110S.
  • the thickness (77.5 ⁇ m) of the first insulating layer 110F between the signal conductor 116 and the shield film 111 in the FPC 110 is the same as that between the signal conductor 1D and the shield film 1A in the comparative FPC 1 shown in FIG. It is thicker than the thickness (55 ⁇ m) of the insulating layer (insulating layer 1B and adhesive layer 1C), and is approximately 1.4 times as thick.
  • the impedance of the signal conductor 116 in the FPC 110 becomes high, and the value calculated by simulation using the differential impedance model is It was about 120 ⁇ .
  • the signal conductor width, thickness, and signal conductor spacing are the same as those of the comparative FPC1.
  • Such a high impedance is a good value that can be fully used in a two-wire differential voltage type data communication network such as CAN.
  • the FPC 110 divides the portion of the insulating film other than the adhesive layer included in the first insulating layer 110F into two insulating layers 112 and 114, with a distance of 30 ⁇ m between these layers. They are bonded together with a thick adhesive layer 113. Further, the elastic modulus of the adhesive layer 113 is smaller than the elastic modulus of the two insulating layers 112 and 114. The elastic modulus of the adhesive layer 113 is 1.2 Gpa, and since it is a member that is very bendable and relieves stress, it increases the thickness of the first insulating layer 110F and realizes ease of bending.
  • the first insulating layer 110F has high bending resistance. Note that even if the elastic modulus of the adhesive layer 113 is not smaller than that of the insulating layers 112 and 114, the bending resistance can be improved by using a material that has strong adhesion to the insulating layers 112 and 114, or a material that has strong toughness. be able to.
  • the FPC 110 is wound on the inner circumference side of the folded part 110c (the part indicated by arrow A in FIG. 3) and on the outer circumference side of the folded part 110c (the part indicated by arrow B in FIG. 3). They overlap each other.
  • the shield film 111 is located inside the annular space S in the radial direction, and the adhesive layer 117 and the insulating layer 118 are located inside the annular space S in the radial direction. Since the signal conductor 116 is located on the outer side, the signal conductor 116 overlaps the shield film 111 on the outer side by one circumference via the adhesive layer 117 and the insulating layer 118, that is, the second insulating layer 110S.
  • the shield film 111 is located on the outside of the annular space S in the radial direction, and the adhesive layer 117 and the insulating layer 118 are located on the outer side of the annular space S. Since the signal conductor 116 is located on the inside in the radial direction, the signal conductor 116 overlaps with the shield film 111 one round inside via the adhesive layer 117 and the insulating layer 118, that is, the second insulating layer 110S.
  • FIG. 9 is a cross-sectional view showing a state in which the FPCs 110 are overlapped.
  • the FPC 110 can be bent more easily than in the case where the second insulating layer 110S, which is similar to the first insulating layer 110F, has the same thickness, and the stress generated when bending can be suppressed. It is possible to suppress a decrease in bending resistance.
  • the second insulating layer 110S is made thinner than the first insulating layer 110F because there is an air layer between them. good impedance can be ensured.
  • the bending resistance can be increased by making the first insulating layer thinner.
  • the two insulating layers 112 and 114 are bonded together by the adhesive layer 113, but the two insulating layers 112 and 114 and the adhesive layer 113 are combined into one It may be formed of an insulating layer. Even so, bending resistance can be ensured by making the second insulating layer 110S thin.
  • grease or the like may be applied to the surface of the FPC 110 or other FPC.
  • grease will be present in the air layer, the distance between the signal conductor 116 of the FPC 110 and the shield layer of the other FPC is maintained, so the same effect can be obtained.
  • the thickness of the second insulating layer 110S on the side opposite to the side on which the shield film 111 is arranged with respect to the signal conductor 116 is 42.5 ⁇ m, and the thickness of the first insulating layer 110F (77.5 ⁇ m).
  • the FPC 110 used in the rotary connector 100 is thinner than 5 ⁇ m), the signal impedance is stable even in the overlapping portion, and the optimum impedance for communication can be obtained, and bending resistance can be ensured.
  • the relationship of thickness of the first insulating layer 110F>thickness of the second insulating layer 110S may be realized, for example, by increasing the thickness of the first insulating layer 110F at the design stage, or by increasing the thickness of the second insulating layer 110F at the design stage. This may be realized by reducing the thickness of 110S.
  • the shield film 111 is located on the outer side in the radial direction of the annular space S on the outer circumferential side of the folded portion 110c (the part indicated by arrow B in FIG. 3), the FPC 110 cannot shield noise from the outside. can.
  • the rotary connector 100 includes the stator 2 having the lead block 11, the rotor 3 having the lead block 21 and being rotatably arranged relative to the stator 2, and the stator 2 and the rotor 3.
  • the FPC 110 is housed in an annular space S between the two, and has both ends connected to the stator 2 and the rotor 3, respectively.
  • the FPC 110 includes a first insulating layer 110F, a second insulating layer 110S, a signal conductor 116 formed between the first insulating layer 110F and the second insulating layer 110S, and a signal conductor for the first insulating layer 110F.
  • the first insulating layer 110F is thicker than the second insulating layer 110S.
  • the first insulating layer 110F is thicker than the second insulating layer 110S, a sufficient distance between the shield film 111 and the signal conductor 116 can be ensured, and the impedance of the signal conductor 116 can be stabilized. Further, when the FPC 110 is housed in the annular space S and wound, a layer of air is interposed between the overlapping FPCs 110, so that the thickness of the second insulating layer 110S becomes the thickness of the first insulating layer 110F.
  • the optimal impedance of the FPC 110 can be ensured because the distance between the shield film of the adjacent FPC can be secured, and the thickness of the second insulating layer S is set to be thinner than the thickness of the first insulating layer F. Decrease in bending resistance can be suppressed.
  • the first insulating layer 110F includes two insulating layers 112 and 114, and an adhesive layer 113 that bonds between the two insulating layers 112 and 114.
  • the part of the insulating film included in the first insulating layer 110F is divided into two insulating layers 112 and 114, which are bonded by an adhesive layer 113, so that the impedance of the shield film 111 is stabilized by ensuring the thickness of the first insulating layer 110F. It is possible to provide a rotary connector 100 that is both flexible and improves the bending resistance of the first insulating layer 110F.
  • the elastic modulus of the adhesive layer 113 is smaller than the elastic modulus of the two insulating layers 112 and 114, the stress during bending of the first insulating layer 110F can be alleviated, and the bending resistance can be improved.
  • the FPC 110 has a folded part 110c which is folded back in the annular space S and the winding direction is reversed, and the shield film 111 is located inside the folded part 110c in the radial direction on the inner peripheral side of the folded part 110c.
  • the shield film 111 is located on the outside in the radial direction. Therefore, noise from outside the rotary connector 100 can be shielded, and a state in which the high-speed digital signal transmitted through the signal conductor 116 has a good waveform can be realized.
  • a similar configuration may be realized and used in a flat cable in which a conductive wire is coated with a laminated resin instead of the FPC 110.
  • a conductive wire may be used instead of the signal conductor 116 and covered with laminated resin, and the thickness of the laminated resin may be changed above and below the conductive wire, or a resin layer may be provided between the laminated film and the shield layer. It may be configured as follows.
  • the first insulating layer 110F is the base insulating layer of the FPC 110 and the second insulating layer 110S is the protective layer, that is, the case where the shield film 111 is formed on the base insulating layer side. Similar effects can also be obtained in a configuration in which the shield film 111 is provided on the protective layer side of the FPC 110.
  • an adhesive layer 115 is provided on the insulating layer 114 as a base insulating layer, a metal foil for the signal conductor 116 is pasted on the adhesive layer 115, and then the metal foil is patterned.
  • an adhesive layer 117, an insulating layer 118, an adhesive layer similar to the adhesive layer 113, and an insulating layer similar to the insulating layer 112 are formed as protective layers on the signal conductor 116. do. It can be manufactured by providing a shield film 111 on this insulating layer.
  • the protective layer is the first insulating layer
  • the base insulating layer is the second insulating layer.
  • FIG. 10 is a diagram showing a bent state of the FPC 110 according to a modification of the embodiment.
  • the connection terminal parts 110a and 110b are connected to the lead blocks 11 and 21 (see FIGS. 2 to 4), respectively, so that the shield film 111 is on the inside at the folded part 110c. Ru.
  • the shield film 111 is located on the outside of the annular space S in the radial direction. Further, on the outer peripheral side of the folded portion 110c (the portion indicated by the arrow B in FIG. 3), the shield film 111 is located inside the annular space S in the radial direction.
  • the outer side in the thickness direction of the FPC 110 is pulled in the extending direction of the FPC 110, and the inner side is compressed. Thinner materials are more resistant to tension, and thicker materials are more resistant to compression.
  • the second insulating layer 110S is thinner than the first insulating layer 110F, by positioning it on the outside at the folded portion 110c, the tensile resistance of the FPC 110 can be improved. Furthermore, by locating the first insulating layer 110F and the shield on the inner side of the folded portion 110c, the resistance against compression of the FPC 110 can be improved.
  • the shield film 111 When connecting the FPC 110 between the lead blocks 11 and 21, it is determined whether the shield film 111 is located inside the folded portion 110c as shown in FIG. 10 or outside as shown in FIG. It may be determined based on the balance between resistance to external noise and resistance to tension and compression at the folded portion 110c.
  • the FPC 110 has a folded part 110c that is folded back within the annular space S and the winding direction is reversed, and in the folded part 110c, the shield film 111 is located inside the folded part 110c. Therefore, the resistance of the FPC 110 to tension can be improved, and the resistance of the FPC 110 to compression can be improved.
  • Rotating connector 110 FPC (Example of flexible cable) 110a Connection terminal portion 110b Connection terminal portion 110c Folded portion 110F First insulating layer 110S Second insulating layer 111 Shield film (an example of a shield layer) 112 Insulating layer 113 Adhesive layer (an example of a bonding layer) 114 Insulating layer 115 Adhesive layer 116 Signal conductor 117 Adhesive layer 118 Insulating layer

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Structure Of Printed Boards (AREA)
PCT/JP2023/007309 2022-06-21 2023-02-28 回転コネクタ Ceased WO2023248537A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2024528287A JPWO2023248537A1 (https=) 2022-06-21 2023-02-28
CN202380047710.7A CN119404390A (zh) 2022-06-21 2023-02-28 旋转连接器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-099836 2022-06-21
JP2022099836 2022-06-21

Publications (1)

Publication Number Publication Date
WO2023248537A1 true WO2023248537A1 (ja) 2023-12-28

Family

ID=89379390

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/007309 Ceased WO2023248537A1 (ja) 2022-06-21 2023-02-28 回転コネクタ

Country Status (3)

Country Link
JP (1) JPWO2023248537A1 (https=)
CN (1) CN119404390A (https=)
WO (1) WO2023248537A1 (https=)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0481417U (https=) * 1990-11-28 1992-07-15
WO2011136008A1 (ja) * 2010-04-28 2011-11-03 古河電気工業株式会社 回転コネクタ装置
JP2013008934A (ja) * 2011-06-27 2013-01-10 Nippon Synthetic Chem Ind Co Ltd:The インピーダンス調整シート及びシールド付き配線部材

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102822553B1 (ko) * 2020-12-15 2025-06-18 후루카와 덴키 고교 가부시키가이샤 회전 커넥터 장치

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0481417U (https=) * 1990-11-28 1992-07-15
WO2011136008A1 (ja) * 2010-04-28 2011-11-03 古河電気工業株式会社 回転コネクタ装置
JP2013008934A (ja) * 2011-06-27 2013-01-10 Nippon Synthetic Chem Ind Co Ltd:The インピーダンス調整シート及びシールド付き配線部材

Also Published As

Publication number Publication date
JPWO2023248537A1 (https=) 2023-12-28
CN119404390A (zh) 2025-02-07

Similar Documents

Publication Publication Date Title
JP5823380B2 (ja) 回転コネクタ装置
KR101664241B1 (ko) 집속형 플렉서블 플랫 회로 케이블
US6469252B1 (en) Flat cable
JP2010211937A (ja) コネクタ付き伝送ケーブル
JP2821333B2 (ja) 携帯電話機
CN116472204A (zh) 旋转连接器装置
JP6005156B2 (ja) 回転コネクタ装置
JP2004289578A (ja) モバイルアンテナ
JP4414365B2 (ja) 高速伝送用基板
WO2023248537A1 (ja) 回転コネクタ
US20250372280A1 (en) Shielded flat cable
JP2017513203A (ja) 配線部材
JP2007173056A (ja) ハーネスおよび電子機器
KR100666069B1 (ko) 통신기기
WO2005029930A1 (ja) フレキシブルプリント基板とそれを用いる接続構造
KR20160073860A (ko) 연성케이블 및 그 제조방법
JPH07131181A (ja) フレキシブルケーブル
JP6635142B2 (ja) 配線部材
JP3620821B2 (ja) 同軸混在フレキシブルフラットケーブル
CN216353424U (zh) 可翻折的传输扁平电缆结构
WO2025023173A1 (ja) フレキシブルフラットケーブルおよび給電装置
US11587697B2 (en) Flat cable assembly
JP2025070025A (ja) 配線構造体および給電装置
JP2002165350A (ja) 回転コネクタ
JP3250140B2 (ja) 無線機のシールド装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23826726

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2024528287

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 202380047710.7

Country of ref document: CN

NENP Non-entry into the national phase

Ref country code: DE

WWP Wipo information: published in national office

Ref document number: 202380047710.7

Country of ref document: CN

122 Ep: pct application non-entry in european phase

Ref document number: 23826726

Country of ref document: EP

Kind code of ref document: A1