Cable with electric connector

Abstract

To provide a cable with an electric connector that can improve transmission characteristics.SOLUTION: A cable with an electric connector comprises: a cable having a plurality of conductors that each have a leading end including a leading end face intersecting a first direction, and that are arranged along a second direction orthogonal to the first direction, a first dielectric substance part that covers the plurality of conductors and exposes the leading ends of the plurality of conductors, and a first shield member that is provided on the first dielectric substance part. The cable with an electric connector comprises: a connector having a second dielectric substance part that has a plurality of holding parts holding the respective leading ends of the plurality of conductors and exposing the leading end faces of the plurality of conductors, and a second shield member that is provided around at least one holding part of the plurality of holding parts when seen from the first direction. The plurality of holding parts are separated from each other in the second direction, and a space is formed between the plurality of holding parts.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to cables with electrical connectors. [Background technology]

[0002] A connector is known that is connected to a flat cable that has signal lines and ground lines arranged in parallel, an insulating layer that covers the signal lines and the ground lines, and a first shielding layer provided on the insulating layer (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 208091 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned electrical connector, since a part of the conductor is exposed from the coating, the dielectric constant distribution around the conductor becomes non-uniform, which may result in a deterioration in communication performance due to impedance mismatch. In addition, since the conductor of the connector is electrically connected to approximately the center of the exposed part of the conductor, there is a risk of a deterioration in communication performance due to a stub.

[0005] An object of the present disclosure is to provide a cable with an electric connector that is capable of improving transmission characteristics. [Means for solving the problem]

[0006] The present disclosure relates to an electric connector cable as one aspect. The electric connector cable includes a cable having a plurality of conductors, each having a tip portion including a tip surface intersecting a first direction, and arranged along a second direction perpendicular to the first direction, a first dielectric portion covering the plurality of conductors and exposing each tip portion of the plurality of conductors, and a first shielding member provided on the first dielectric portion. The electric connector cable includes a connector having a second dielectric portion having a plurality of holding portions that respectively hold each tip portion of the plurality of conductors and expose each tip surface of the plurality of conductors, and a second shielding member provided around at least one of the holding portions when viewed from the first direction. In the electric connector cable, the holding portions are spaced apart from each other along the second direction, and a space is formed between the holding portions. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide a cable with an electric connector that is capable of improving transmission characteristics. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a flat cable with an electric connector according to the first embodiment. [Diagram 2] FIG. 2 is a top view showing a flat cable included in the flat cable with electric connector shown in FIG. [Diagram 3] FIG. 3 is a perspective view showing a flat cable with an electric connector according to the second embodiment. [Figure 4] FIG. 4 is a perspective view showing a flat cable with electric connector according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Description of the embodiments of the present disclosure] First, the contents of the embodiments of the present disclosure will be listed and described. (1) An electric connector-equipped cable according to an embodiment of the present disclosure includes a cable having a plurality of conductors, each having a tip portion including a tip surface intersecting a first direction, and arranged along a second direction perpendicular to the first direction, a first dielectric portion covering the plurality of conductors and exposing each tip portion of the plurality of conductors, and a first shielding member provided on the first dielectric portion. The electric connector-equipped cable includes a connector having a second dielectric portion having a plurality of holding portions that respectively hold each tip portion of the plurality of conductors and expose each tip surface of the plurality of conductors, and a second shielding member provided around at least one of the plurality of holding portions when viewed from the first direction. In the electric connector-equipped cable, the plurality of holding portions are spaced apart from each other along the second direction, and a space is formed between the plurality of holding portions.

[0010] In this cable with electrical connector, the multiple holding parts hold the multiple conductors so that the tip surfaces of the multiple conductors are exposed, and therefore the tip surfaces of the multiple conductors can be electrically connected to the mating connector. This makes it possible to suppress the occurrence of stubs (branching of signals) that occur when parts other than the tip surfaces of the multiple conductors are electrically contacted with the mating connector. In addition, the multiple holding parts are spaced apart from each other along the second direction, and a space is formed between adjacent holding parts. This makes it possible to reduce the dielectric constant of the connector compared to when a dielectric exists between adjacent holding parts. This makes it possible to match the impedance of the cable in the part without the connector and in the part to which the connector is attached. Furthermore, the connector has a second shield member provided around at least one of the multiple holding parts when viewed from the first direction. This makes it possible to reduce noise generated from the conductor held by the holding parts or noise propagating to the conductor. As described above, this cable with electrical connector can improve the transmission characteristics.

[0011] (2) In the cable with electrical connector of (1) above, the first dielectric material constituting the first dielectric portion may have a lower dielectric constant than the second dielectric material constituting the second dielectric portion, thereby improving the dielectric properties of the cable and reducing signal loss in the cable portion.

[0012] (3) In the cable with electrical connector of (1) or (2) above, the multiple holding parts may each include an end face that intersects with the first direction, and each end face of the multiple holding parts may be located on the same plane as each end face of the multiple conductors. In this case, each end face of the multiple conductors can be easily electrically connected to the mating connector.

[0013] (4) In the cable with electrical connectors according to any one of (1) to (3) above, each of the plurality of holding parts may be tubular in shape, and each of the end parts of the plurality of conductors may be disposed inside each of the plurality of holding parts, in which case the plurality of holding parts can easily and reliably hold each of the end parts of the plurality of conductors.

[0014] (5) In the cable with electrical connector according to any one of (1) to (4) above, a space may be formed in each of the plurality of holding portions. In this case, the dielectric constant of the connector can be further reduced. Therefore, the transmission characteristics can be further improved.

[0015] (6) In the cable with an electrical connector according to any one of (1) to (5) above, the multiple conductors may have at least one ground conductor connected to ground, the multiple holding parts may have at least one ground holding part holding at least one ground conductor, an opening may be provided in the at least one ground holding part at a position overlapping a part of a tip of the at least one ground conductor in a predetermined direction perpendicular to the first direction, and the second shield member may pass through the opening and contact the tip of the at least one ground conductor. In this case, the potentials of the second shield member and the ground conductor can be maintained at ground potential, thereby further improving the transmission characteristics.

[0016] (7) In the cable with an electric connector of (6) above, the multiple conductors may include a signal conductor, the multiple holding portions may include a signal holding portion that holds the signal conductor, the at least one ground conductor may be a pair of ground conductors arranged to sandwich the signal conductor along the second direction, the at least one ground holding portion may be a pair of ground holding portions that respectively hold the pair of ground conductors, and the signal holding portion may be surrounded by the second shielding member and the pair of ground conductors when viewed from the first direction. In this case, noise generated from or propagated to the signal conductor can be further reduced, thereby further improving the transmission characteristics.

[0017] (8) In the cable with an electric connector according to any one of (1) to (6) above, the plurality of conductors may include a signal conductor, the plurality of holding portions may include a signal holding portion that holds the signal conductor, and the signal holding portion may be surrounded by the second shielding member when viewed from the first direction. In this case, noise generated from the signal conductor or noise propagating to the signal conductor can be further reduced. Therefore, the transmission characteristics can be further improved.

[0018] [Details of the embodiment of the present disclosure] Specific examples of the cable with electrical connector according to the present embodiment will be described with reference to the drawings as necessary. Note that the present disclosure is not limited to these examples, but is intended to include all modifications within the scope of the claims and meaning equivalent thereto. In the following description, the same elements in the description of the drawings will be given the same reference numerals, and duplicated descriptions will be omitted.

[0019] [First embodiment] FIG. 1 is a perspective view showing a flat cable with electric connectors 1 according to the first embodiment. The flat cable with electric connectors 1 is attached to an electric circuit (not shown), for example, via a mating connector (not shown). FIG. 2 is a top view showing flat cables 2A and 2B provided in the flat cable with electric connectors 1 shown in FIG. 1. The flat cable with electric connectors 1 includes flat cables 2A and 2B and a connector 4. The flat cable 2B has a similar configuration to the flat cable 2A. For this reason, hereinafter, details of the flat cable 2A will be described, and a description of the flat cable 2B may be omitted.

[0020] The flat cable 2A is, for example, a flexible flat cable (FFC). The flat cable 2A includes a plurality of conductors 20, a first dielectric portion 31, and first shielding members 32 and 33. The conductors 20 are members for transmitting electric signals. The material of the conductors 20 is a metal such as copper. The conductors 20 have a cylindrical shape extending along the X-axis direction (first direction). Each conductor 20 is either a signal conductor or a ground conductor. When the flat cable with electric connector 1 is connected to a mating connector, the ground conductor is connected to the ground via a ground terminal provided on the mating connector. In this embodiment, the plurality of conductors 20 are composed of conductors (ground conductors) 21, 24, and 27 that are ground conductors and conductors (signal conductors) 22, 23, 25, and 26 that are signal conductors. The conductors 21 to 27 are arranged in this order along the Y-axis direction that is perpendicular to the X-axis direction. The conductor 21 has a tip portion 21b including a tip surface 21a. Similarly, the conductors 22 to 27 have tip portions 22b to 27b, respectively, and the tip portions 22b to 27b include tip surfaces 22a to 27a, respectively. The tip surfaces 21a to 27a are perpendicular to the X-axis direction.

[0021] A pair of conductors (signal conductors) 22, 23 carry currents of opposite phases to each other, and transmit signals by differential transmission in which a signal is transmitted by a potential difference between the pair of conductors 22, 23. The pair of conductors 22, 23 are sandwiched between a pair of conductors (ground conductors) 21, 24 along the Y-axis direction. A pair of conductors (signal conductors) 25, 26 carry currents of opposite phases to each other, and transmit signals by differential transmission in which a signal is transmitted by a potential difference between the pair of conductors 25, 26. The pair of conductors 25, 26 are sandwiched between a pair of conductors (ground conductors) 24, 27 along the Y-axis direction.

[0022] The first dielectric portion 31 is a member covering the conductors 21 to 27 so as to expose the tip portions 21b to 27b. The first dielectric portion 31 electrically insulates the conductors 21 to 27. A part of the first dielectric portion 31 is located between the conductors 21 to 27 and the first shielding member 32 along the Z-axis direction perpendicular to both the X-axis direction and the Y-axis direction. A part of the first dielectric portion 31 is located between the conductors 21 to 27 and the first shielding member 33 along the Z-axis direction. The first dielectric material constituting the first dielectric portion 31 is, for example, a resin composition containing polyester (polyethylene terephthalate, etc.), polyolefin (polyethylene, polypropylene, etc.), or an olefin-based thermoplastic elastomer. The upper limit of the relative dielectric constant of the first dielectric material is, for example, 2.2 or 2.3 from the viewpoint of improving the dielectric characteristics and reducing the dielectric loss. The relative dielectric constant of the first dielectric material is a value measured under conditions of 25° C. and a frequency of 10 GHz by a cavity resonator perturbation method conforming to JIS-C-2138 (2007), for example. The first dielectric portion 31 may be a laminate of films, or may be a thin one formed by extrusion molding.

[0023] The first shielding members 32 and 33 are provided on the first dielectric portion 31 so as to sandwich the first dielectric portion 31 along the Z-axis direction. The first shielding members 32 and 33 are layered members that function as noise countermeasures for the flat cable 2A. The first shielding members 32 and 33 are formed of metal foil such as copper foil or aluminum foil. The first shielding members 32 and 33 are fixed to the surface of the first dielectric portion 31 by, for example, an adhesive. Both ends of the first shielding members 32 and 33 along the Y-axis direction overlap both ends of the first dielectric portion 31 when viewed from the Z-axis direction. The flat cable 2A may be provided with a protective layer made of resin that covers the first shielding members 32 and 33.

[0024] The flat cables 2A, 2B are arranged side by side along the Z-axis direction. The flat cables 2A, 2B are held by a connector 4. As shown in Fig. 1, the connector 4 has a frame body 41, a second dielectric portion 42, and second shield members 43, 44, and 45.

[0025] The frame 41 has a rectangular shape when viewed from the X-axis direction. The frame 41 is made of a metal such as copper or aluminum. The tip portions 21b to 27b extend outside the frame 41 when viewed from the Z-axis direction. The frame 41 has a surface 41a located closer to the tip surfaces 21a to 27a in the X-axis direction. A second dielectric portion 42 is provided on the surface 41a. The frame 41 is electrically connected to the first shield members 32 and 33 of the flat cables 2A and 2B. In this regard, it is preferable that the inner surface of the frame 41 (the surface in contact with the flat cables 2A and 2B) is made of metal. The outer surface of the frame 41 may be covered with a resin or the like.

[0026] The second dielectric portion 42 has a flat plate portion 46, a plurality of holding portions 50, and a plurality of holding portions 60. The holding portions 50, 60 are molded integrally with the flat plate portion 46, for example. The second dielectric material constituting the flat plate portion 46, the plurality of holding portions 50, and the plurality of holding portions 60 is, for example, an engineering plastic such as polyphenylene sulfide (PPS). As a result of adopting a material having excellent mechanical strength and moldability as the second dielectric material, the relative dielectric constant of the second dielectric material of the second dielectric portion 42 may be higher than the relative dielectric constant of the first dielectric material of the first dielectric portion 31. The relative dielectric constant of the second dielectric material may be higher than 2.2 or may be higher than 2.3. The relative dielectric constant of the second dielectric material is, for example, a value measured under conditions of 25°C and a frequency of 10 GHz by a cavity resonator perturbation method conforming to JIS-C-2138 (2007).

[0027] The flat plate portion 46 is a rectangular plate member. The flat plate portion 46 extends along the YZ plane. The flat plate portion 46 is fixed to the surface 41a of the frame body 41 by, for example, an adhesive or the like. The flat plate portion 46 may be held by the frame body 41 so as to be located inside the frame body 41. The flat plate portion 46 has a surface 46a opposite to the surface fixed to the surface 41a of the frame body 41. The flat plate portion 46 is provided with through holes (not shown) through which the tip portions 21b to 27b pass.

[0028] The multiple holding portions 50 are portions that hold the respective end portions 21b to 27b of the conductors 21 to 27 of the flat cable 2A. The multiple holding portions 50 are composed of holding portions 51 to 57. The holding portions 51 to 57 are provided so as to protrude from the surface 46a along the X-axis direction. The holding portions 51 to 57 are arranged in this order along the Y-axis direction.

[0029] The holding parts (ground holding parts) 51, 54, 57 hold the tip parts 21b, 24b, 27b of the conductors (ground conductors) 21, 24, 27, respectively. The shape of the holding part 51 is cylindrical. The inside of the holding part 51 communicates with a through hole (not shown) provided in the flat plate part 46. The tip part 21b of the conductor 21 that passes through the through hole is disposed inside the holding part 51. The tip part 21b is in contact with the inner surface of the holding part 51. The holding part 51 has an end face 51a that is perpendicular to the X-axis direction. The end face 51a is located on the same plane as the tip face 21a of the tip part 21b. Depending on the structure of the connection point of the counterpart (receptacle) to which the conductor 21 is electrically connected, the end face 51a and the tip face 21a do not have to be completely on the same plane, and a deviation of several μm is allowed.

[0030] The holding portion 51 is provided with openings 51b and 51c extending in the Z-axis direction (a direction perpendicular to the X-axis and Y-axis). The openings 51b and 51c overlap a portion of the tip portion 21b in the Z-axis direction. The openings 51b and 51c penetrate the cylindrical wall of the holding portion 51 and communicate between the inside and outside of the holding portion 51. The openings 51b and 51c sandwich the tip surface 21a when viewed from the X-axis direction.

[0031] The holding portions 54 and 57 have the same configuration as the holding portion 51. The end faces 54a and 57a of the holding portions 54 and 57 are located on the same plane as the tip faces 24a and 27a of the holding portions 54 and 57. The holding portion 54 has openings 54b and 54c, and the holding portion 57 has openings 57b and 57c.

[0032] The holding parts (signal holding parts) 52, 53, 55, 56 hold the tip parts 22b, 23b, 25b, 26b of the conductors (signal conductors) 22, 23, 25, 26, respectively. The shape of the holding part 52 is cylindrical. The inside of the holding part 52 communicates with a through hole (not shown) provided in the flat plate part 46. The tip part 22b of the conductor 22 that passes through the through hole is disposed inside the holding part 52. The tip part 22b is in contact with the inner surface of the holding part 52. The holding part 52 has an end face 52a that is perpendicular to the X-axis direction. The end face 52a is located on the same plane as the tip face 22a of the tip part 22b. Depending on the structure of the connection point of the counterpart (receptacle) to which the conductor 22 is electrically connected, the end face 52a and the tip face 22a do not have to be completely on the same plane, and a deviation of several μm is allowed.

[0033] The holding portions 53, 55, and 56 have the same configuration as the holding portion 52. End faces 53a, 55a, and 56a of the holding portions 53, 55, and 56 are located on the same plane as the tip faces 23a, 25a, and 26a, respectively.

[0034] The holding portions 51 to 57 are spaced apart from one another along the Y-axis direction, and a space S1 is formed between the holding portions 51 to 57. For example, a space S1 is formed between the holding portions 51 and 52, and a space S1 is formed between the holding portions 52 and 53. A space S1 is also formed between the holding portions 53 to 57. That is, the second dielectric material does not exist between the holding portions 51 to 57. The space S1 functions as, for example, an air layer. That is, the relative dielectric constant in the space S1 between each of the holding portions 51 to 57 can be considered to be approximately 1.

[0035] The multiple holding portions 60 are portions that hold the conductors 21 to 27 of the flat cable 2B. The multiple holding portions 60 are composed of holding portions 61 to 67. The holding portions 61 to 67 are provided so as to protrude from the surface 46a along the X-axis direction. The holding portions 61 to 67 are arranged in this order along the Y-axis direction. The configuration of each of the holding portions 61 to 67 is similar to the configuration of each of the holding portions 51 to 57. The holding portions 61, 64, and 67 are provided with openings in the same manner as the holding portions 51, 54, and 57.

[0036] The holding portions 61 to 67 are provided apart from the holding portions 51 to 57 along the Z-axis direction. As a result, a space is further formed between the holding portions 51 to 57 and the holding portions 61 to 67. In other words, the second dielectric material does not exist between the holding portions 51 to 57 and the holding portions 61 to 67. This space functions as an air layer similar to the space S1.

[0037] The second shielding members 43, 44, and 45 are members that function as electrical shielding parts of the connector 4. The second shielding member 43 has a flat plate portion 43a and contact portions 43b, 43c, and 43d. The flat plate portion 43a and the contact portions 43b, 43c, and 43d are made of a material such as copper or aluminum. The flat plate portion 43a is a rectangular plate member. The flat plate portion 43a extends along the XY plane. When viewed from the Z-axis direction, the flat plate portion 43a extends from the center of the holding portion 51 to the center of the holding portion 57 in the Y-axis direction. The flat plate portion 43a is provided above the holding portions 51 to 57 and is located on the opposite side of the holding portions 61 to 67 with respect to the holding portions 51 to 57. The flat plate portion 43a penetrates a part of the flat plate portion 46 of the second dielectric portion 42 and contacts the frame body 41. The flat plate portion 43a may be attached to the flat plate portion 46 of the second dielectric portion 42. The second shield members 43, 44, and 45 are electrically connected to the frame 41.

[0038] The contact portions 43b, 43c, and 43d are provided on the flat plate portion 43a and extend along the Z-axis direction. The contact portion 43b passes through the opening 51b and contacts the tip portion 21b. The contact portion 43c passes through the opening 54b and contacts the tip portion 24b. The contact portion 43d passes through the opening 57b and contacts the tip portion 27b. The contact portions 43b, 43c, and 43d may be attached to the flat plate portion 46 of the second dielectric portion 42. The contact portions 43b, 43c, and 43d may penetrate the flat plate portion 46 of the second dielectric portion 42 and be electrically connected to the frame body 41.

[0039] The second shield member 44 has a flat plate portion 44a and contact portions 44b, 44c, and 44d. The flat plate portion 44a is a rectangular plate member. The flat plate portion 44a extends along the XY plane. The flat plate portion 44a is located between the holding portions 51 to 57 and the holding portions 61 to 67. The holding portions 51 to 57 are sandwiched between the flat plate portions 43a and 44a along the Z-axis direction. The contact portions 44b, 44c, and 44d are provided on the flat plate portion 44a and extend along the Z-axis direction. The contact portion 44b passes through the opening 51c and contacts the tip portion 21b. The contact portion 44c passes through the opening 54c and contacts the tip portion 24b. The contact portion 44d passes through the opening 57c and contacts the tip portion 27b. The second shield member 44 further has a plurality of contact portions, and the plurality of contact portions are in contact with the tip portions 21b, 24b, and 27b held by the holding portions 61, 64, and 67, respectively.

[0040] The second shield member 45 has a similar configuration to the second shield member 43. The second shield member 45 is located on the opposite side of the second shield member 44 from the second shield member 43. The second shield member 45, like the second shield member 43, is in contact with the tip portions 21b, 24b, and 27b held by the holding portions 61, 64, and 67.

[0041] When viewed from the X-axis direction, the holding portions (signal holding portions) 52, 53 are surrounded by a pair of conductors (ground conductors) 21, 24, the flat plate portion 43a, the contact portions 43b, 43c, the flat plate portion 44a, and the contact portions 44b, 44c. That is, the holding portions 52, 53 are surrounded by the conductors 21, 24 and the second shielding members 43, 44 of the flat cable 2A. A space S1 is formed in the region where the conductors 21, 24 and the second shielding members 43, 44 surround the holding portions 52, 53. As a result, the dielectric constant in this region is smaller than when the space S1 is not formed in this region. Similarly, the holding portions 62, 63 are surrounded by the conductors 21, 24 and the second shielding members 44, 45 of the flat cable 2B. A space is formed in the region where the conductors 21, 24 and the second shield members 44, 45 surround the holding portions 62, 63. As a result, the dielectric constant in this region is smaller than when the space S1 is not formed in this region.

[0042] In the flat cable with electric connector 1 described above, the holding parts 51 to 57 hold the conductors 21 to 27 so that the tip surfaces 21a to 27a are exposed, so that the tip surfaces 21a to 27a can be electrically connected to the mating connector. This makes it possible to suppress the occurrence of stubs (branching of signals) that occur when the parts of the conductors 21 to 27 other than the tip surfaces 21a to 27a are electrically contacted with the mating connector. In addition, the holding parts 51 to 57 are spaced apart from each other along the Y-axis direction, and a space S1 is formed between adjacent holding parts (for example, the holding parts 51 and 52). Therefore, the dielectric constant of the connector 4 can be reduced compared to when the second dielectric material is present between adjacent holding parts. Therefore, the impedance of the flat cables 2A and 2B can be matched in the part without the connector 4 and the part to which the connector 4 is attached. Furthermore, the connector 4 has second shield members 43 and 44 provided around the holding parts 52, 53, 55, and 56 when viewed from the X-axis direction. This makes it possible to reduce noise generated from the conductors 22, 23, 25, 26 held by the holding portions 52, 53, 55, 56, or noise propagating to the conductors 22, 23, 25, 26. As described above, the flat cable with electric connector 1 can improve the transmission characteristics.

[0043] In the flat cable with electric connectors 1, the relative dielectric constant of the first dielectric material constituting the first dielectric portion 31 is lower than the relative dielectric constant of the second dielectric material constituting the second dielectric portion 42. This improves the dielectric properties of the flat cables 2A, 2B, and reduces signal loss in the flat cables 2A, 2B. In addition, since the overall dielectric constant of the connector 4 is reduced as described above, even if the relative dielectric constant of the second dielectric material is higher than the relative dielectric constant of the first dielectric material, the overall dielectric constant of the connector 4 can be made closer to the dielectric constant of the flat cables 2A, 2B.

[0044] [Second embodiment] A flat cable with electric connectors 1A according to the second embodiment will be described below. The following mainly describes the differences from the flat cable with electric connectors 1 according to the first embodiment, and other descriptions may be omitted.

[0045] FIG. 3 is a perspective view showing a flat cable with an electric connector 1A according to the second embodiment. The holding portion (ground holding portion) 51 has a plurality of holding portions 51A. The holding portions 51A are separated from each other when viewed from the X-axis direction, and a space S2 is formed between the plurality of holding portions 51A. In one example, the four holding portions 51A are arranged at equal intervals around the tip surface 21a when viewed from the X-axis direction. The shape of each holding portion 51A when viewed from the X-axis direction is an annular sector. The holding portion (signal holding portion) 52 has a plurality of holding portions 52A, and the holding portion (signal holding portion) 53 has a plurality of holding portions 53A. The configurations of the holding portions 52A and 53A are the same as the configuration of the holding portion 51A. The holding portions 54 to 57 and the holding portions 61 to 67 have a plurality of holding portions, similar to the holding portion 51.

[0046] The second shielding member 43A is formed in an annular shape when viewed from the X-axis direction. The holding portions (signal holding portions) 52, 53 are surrounded by the second shielding member 43A when viewed from the X-axis direction. In the region where the second shielding member 43A surrounds the holding portions 52, 53, spaces S1, S2 are formed. The space S1 is a space between the holding portions 51-57, and the space S2 is a slit in the holding portions 51-57. This makes the dielectric constant in this region smaller than when the spaces S1, S2 are not formed in this region. It is preferable that the second shielding member 43A is electrically connected to the frame body 41 by penetrating the second dielectric portion 42.

[0047] In the flat cable with electric connector 1A described above, the holding portion 51 has a plurality of holding portions 51A that are separated from each other when viewed from the X-axis direction, and a space S2 is formed between the plurality of holding portions 51A. Similarly, the holding portions 52 to 57 and the holding portions 61 to 67 each have a plurality of holding portions. This makes it possible to reduce the dielectric constant of the connector 4 compared to a case in which the holding portions 51 to 57 are each integrally formed and the holding portions 61 to 67 are each integrally formed. Therefore, it is possible to further improve the transmission characteristics.

[0048] In the flat cable with electric connector 1A, the holding portions (signal holding portions) 52, 53 are surrounded by the second shield member 43A when viewed from the X-axis direction. This makes it possible to further reduce noise generated from the conductors (signal conductors) 22, 23 or noise propagating to the conductors 22, 23. This makes it possible to further improve the transmission characteristics.

[0049] The flat cable with electric connector according to the present disclosure is not limited to the above-mentioned embodiment, and various other modifications are possible. The shape of the conductor is not limited to a cylindrical shape, and may be, for example, a plate shape. In the second embodiment, two holding parts (signal holding parts) are surrounded by the second shielding member, but the number of holding parts surrounded by the second shielding member is not limited. For example, one or three signal holding parts may be surrounded by the second shielding member. In the second embodiment, when the conductors (signal conductors) 22 and 23 transmit signals independently rather than by differential transmission, each of the holding parts (signal holding parts) 52 and 53 may be individually surrounded by the second shielding member 43A as shown in FIG. 4. FIG. 4 is a perspective view showing a flat cable with electric connector 1A according to the second embodiment. [Explanation of symbols]

[0050] 1,1A...Flat cable with electrical connector 2A, 2B...Flat cable 4…Connector 20…Conductor 21 to 27…conductor 21a to 27a...Tip surface 21b to 27b...Tip 31...First dielectric portion 32...First shield member 33…First shield member 41…Frame body 41a…side 42...Second dielectric portion 43, 43A, 44, 45...Second shield member 43a, 44a…flat plate part 43b, 43c, 43d, 44b, 44c, 44d...Contact part 46...Flat plate part 46a…side 50...Holding part 51 to 57: Retaining part 51A, 52A, 53A…Retaining part 51a to 57a...End face 51b, 51c, 54b, 54c, 57b, 57c...Opening 60...Holding part 61 to 67…Retaining part S1,S2…space

Claims

1. a cable including: a plurality of conductors each having a tip portion including a tip surface intersecting a first direction and arranged along a second direction perpendicular to the first direction; a first dielectric portion covering the plurality of conductors and exposing the tip portions of the plurality of conductors; and a first shielding member provided on the first dielectric portion; a second dielectric portion having a plurality of holding portions that respectively hold the tip ends of the plurality of conductors and expose the tip surfaces of the plurality of conductors, and a second shielding member provided around at least one of the plurality of holding portions when viewed from the first direction; The cable with an electrical connector, wherein the plurality of holding portions are spaced apart from one another along the second direction, and spaces are formed between the plurality of holding portions.

2. a first dielectric material constituting the first dielectric portion has a lower relative dielectric constant than a second dielectric material constituting the second dielectric portion; 2. The cable with electrical connector according to claim 1.

3. Each of the plurality of holding portions includes an end surface intersecting the first direction, The end surfaces of the plurality of holding portions are located on the same plane as the tip surfaces of the plurality of conductors.

3. The cable with electrical connector according to claim 1 or 2.

4. Each of the plurality of holding portions has a cylindrical shape, The tip portions of the plurality of conductors are disposed inside the respective ones of the plurality of holding portions.

3. The cable with electrical connector according to claim 1 or 2.

5. A space is formed in each of the plurality of holding portions.

3. The cable with electrical connector according to claim 1 or 2.

6. the plurality of conductors includes at least one ground conductor connected to a ground; the plurality of holding portions include at least one ground holding portion that holds the at least one ground conductor, an opening is provided in the at least one ground retaining portion at a position overlapping a portion of the tip end of the at least one ground conductor in a predetermined direction perpendicular to the first direction; the second shield member passes through the opening and contacts the tip portion of the at least one ground conductor.

3. The cable with electrical connector according to claim 1 or 2.

7. the plurality of conductors includes a signal conductor; the plurality of holding portions include a signal holding portion that holds the signal conductor, the at least one ground conductor is a pair of ground conductors arranged in the second direction to sandwich the signal conductor therebetween, the at least one ground retaining portion is a pair of ground retaining portions that respectively retain the pair of ground conductors, the signal holding portion is surrounded by the second shielding member and the pair of ground conductors when viewed from the first direction.

7. The cable with electrical connector according to claim 6.

8. the plurality of conductors includes a signal conductor; the plurality of holding portions include a signal holding portion that holds the signal conductor, the signal holding portion is surrounded by the second shielding member when viewed from the first direction.

3. The cable with electrical connector according to claim 1 or 2.

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