Shielded Connectors

Abstract

To improve impedance matching.SOLUTION: A first connector 10 has: a first inner conductor 11; a first dielectric 21 surrounding the first inner conductor 11; and a first outer conductor 32 surrounding the first dielectric 21. A second connector 50 has: a second inner conductor 51 connected to the first inner conductor 11; a second dielectric 61 surrounding the second inner conductor 51; and second outer conductor 72 connected to the first outer conductor 32 while surrounding the second dielectric 61. The radial distance between the first inner conductor 11 and the first outer conductor 32 is narrower than that between the second inner conductor 51 and the second outer conductor 72. The first dielectric 21 is provided with a first air chamber 29 for impedance matching which has a shape formed by recessing a circumferential surface of the first dielectric 21. The second dielectric 61 is provided with a second air chamber 69 for impedance matching which has a shape formed by recessing a circumferential surface of the second dielectric 61. The volume of the first air chamber 29 is greater than that of the second air chamber 69.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present disclosure relates to shielded connectors. [Background technology]

[0002] Patent Document 1 discloses a coaxial connector having an inner conductor terminal surrounded by a dielectric, which is surrounded by an outer conductor terminal. At the connection portion between the female outer conductor terminal and the male outer conductor terminal, the female outer conductor terminal is disposed so as to surround the male outer conductor terminal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-162375 A Summary of the Invention [Problem to be solved by the invention]

[0004] When applying this type of coaxial connector to a circuit for high-speed communication, it is important to match the impedance, but since the inner conductor terminal, the dielectric, and the outer conductor terminal each have various functional parts and are complex in shape, it is difficult to match the impedance.

[0005] The shielded connector of the present disclosure has been developed based on the above circumstances, and aims to improve impedance matching. [Means for solving the problem]

[0006] The shielded connector of the present disclosure comprises: a first connector and a second connector that are connected to each other; the first connector has a first inner conductor, a first dielectric surrounding the first inner conductor, and a first outer conductor surrounding the first dielectric, the second connector has a second inner conductor connected to the first inner conductor, a second dielectric surrounding the second inner conductor, and a second outer conductor connected to the first outer conductor while surrounding the second dielectric, a radial distance between the first inner conductor and the first outer conductor is narrower than a radial distance between the second inner conductor and the second outer conductor; The first dielectric has a first air chamber for impedance matching formed by recessing a peripheral surface of the first dielectric, The second dielectric has a second air chamber for impedance matching formed by recessing a peripheral surface of the second dielectric, The volume of the first air chamber is greater than the volume of the second air chamber. Effect of the Invention

[0007] According to the present disclosure, impedance matching can be improved. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view illustrating a state in which a first connector and a second connector are separated from each other in the shielded connector of the first embodiment. [Diagram 2] FIG. 2 is a perspective view showing an exploded state of the first connector. [Diagram 3] FIG. 3 is a cross-sectional view of the first connector. [Figure 4] FIG. 4 is a partially enlarged cross-sectional view showing a retaining structure for the first inner conductor. [Diagram 5] FIG. 5 is a partially enlarged external view showing a first inner conductor and a first dielectric in the first connector. [Figure 6] FIG. 6 is a perspective view showing the second connector in an exploded state. [Figure 7] FIG. 7 is a cross-sectional view of the second connector. [Figure 8] FIG. 8 is a partially enlarged cross-sectional view showing a retaining structure for the second inner conductor. [Figure 9] FIG. 9 is a partially enlarged cross-sectional view showing a connection structure between the first connector and the second connector. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. The shielded connector of the present disclosure comprises: (1) A connector includes a first connector and a second connector connected to each other, the first connector having a first inner conductor, a first dielectric surrounding the first inner conductor, and a first outer conductor surrounding the first dielectric, the second connector having a second inner conductor connected to the first inner conductor, a second dielectric surrounding the second inner conductor, and a second outer conductor connected to the first outer conductor while surrounding the second dielectric, a radial distance between the first inner conductor and the first outer conductor being narrower than a radial distance between the second inner conductor and the second outer conductor, a first air chamber for impedance matching having a shape formed by recessing a peripheral surface of the first dielectric is formed in the first dielectric, and a second air chamber for impedance matching having a shape formed by recessing a peripheral surface of the second dielectric is formed in the second dielectric, and a volume of the first air chamber is larger than a volume of the second air chamber.

[0010] The characteristic impedance of the first connector and the second connector decreases as the radial distance between the inner conductor and the outer conductor decreases. The larger the volume of the air chamber formed in the dielectric (between the inner conductor and the outer conductor) is, the larger the characteristic impedance is. In view of the fact that the radial distance between the first inner conductor and the first outer conductor is narrower than the radial distance between the second inner conductor and the second outer conductor, the shielded connector of the present disclosure sets the volume of the first air chamber formed between the first inner conductor and the first outer conductor to be larger than the volume of the second air chamber formed between the second inner conductor and the second outer conductor. This configuration can improve impedance matching between the first connector and the second connector.

[0011] (2) It is preferable that the first air chamber opens to an inner peripheral surface of the first dielectric, the first inner conductor is inserted into the first dielectric from the rear, a first retaining portion is formed in the first inner conductor, and the first inner conductor is prevented from falling out by being retained by a first retaining portion at an opening edge of the first air chamber. According to this configuration, the first air chamber has both a function of improving impedance matching and a function of preventing the first inner conductor from falling out, so that the shape of the first dielectric can be simplified.

[0012] (3) In (2), it is preferable that the first locking portion elastically deforms in the radial direction during the process of inserting the first inner conductor into the first dielectric, and when the first inner conductor is inserted to a correct position relative to the first dielectric, the first locking portion elastically returns to its original position to be locked by the first retaining portion. With this configuration, it is possible to reduce insertion resistance during the process of inserting the first inner conductor into the first dielectric. When the first inner conductor is inserted to the correct position, a clicking sensation caused by the elastic return action of the first locking portion can be felt.

[0013] (4) In the configuration (2) or (3), the first locking portion includes a first tapered portion extending obliquely backward from an outer circumferential surface of the first inner conductor; The first tapered portion and a first straight portion extending in a cantilever shape parallel to the axis of the first inner conductor from the rear end of the first engaging portion. With this configuration, the radial protrusion dimension of the first engaging portion is kept small, so that the variation in the outer diameter dimension of the first inner conductor is reduced, and impedance matching is improved.

[0014] (5) In (4), it is preferable that the first inner conductor is prevented from falling out by the rear end face of the first straight portion coming into face-to-face contact with the first retaining portion made of synthetic resin. According to this configuration, since the first straight portion made of metal comes into face-to-face contact with the first retaining portion made of synthetic resin, the first locking portion is unlikely to bite into the first locking portion, and the first locking portion and the first locking portion provide a highly reliable locking function.

[0015] (6) It is preferable that the width dimension in the circumferential direction of the first air chamber is larger than the outer diameter of the first inner conductor. With this configuration, a sufficiently large volume of the first air chamber can be ensured.

[0016] (7) A first connection portion is formed at the front end of the first inner conductor, which is connected to the second inner conductor while being housed in the first dielectric, and the front end of the first air chamber is preferably shaped so as not to open to the front end face of the first dielectric, but to open only to the circumferential surface of the first dielectric. With this configuration, when the first inner conductor tries to tilt obliquely, the tilt is suppressed by abutting against the inner circumferential surface of the first dielectric. Since the first air chamber does not open to the front end face of the first dielectric, the first dielectric has high rigidity. As a result, the tilt of the first inner conductor can be reliably suppressed by the rigidity of the first dielectric.

[0017] (8) It is preferable that a tapered guide surface for guiding the second inner conductor into the first dielectric is formed on a front end surface of the first dielectric, and the front end of the first air chamber does not open to the front end surface of the first dielectric, but opens only to the peripheral surface of the first dielectric. First Dielectric Since the guide surface can be made to have a continuous shape all around without any breaks, the guide function of the guide surface is highly reliable.

[0018] (9) It is preferable that the second air chamber opens to an inner peripheral surface of the second dielectric, the second inner conductor is inserted into the second dielectric from the rear, a second retaining portion is formed in the second inner conductor, and the second inner conductor is prevented from falling out by being retained by a second retaining portion at an opening edge of the second air chamber. According to this configuration, the second air chamber has both a function of improving impedance matching and a function of preventing the second inner conductor from falling out, so that the shape of the second dielectric can be simplified.

[0019] (10) In (9), it is preferable that the second locking portion elastically deforms in the radial direction during the process of inserting the second inner conductor into the second dielectric, and when the second inner conductor reaches a correct insertion position with respect to the second dielectric, the second locking portion elastically returns to its original position to be locked by the second retaining portion. With this configuration, it is possible to reduce insertion resistance during the process of inserting the second inner conductor into the second dielectric. When the second inner conductor is inserted to the correct position, a clicking sensation caused by the elastic return action of the second locking portion can be felt.

[0020] (11) In the configuration (9) or (10), the second locking portion includes a second tapered portion extending obliquely backward from an outer circumferential surface of the second inner conductor; The second tapered portion and a second straight portion extending in a cantilever shape from the rear end of the second engaging portion in parallel to the axis of the second inner conductor. With this configuration, the radial protrusion dimension of the second engaging portion is kept small, so that the variation in the outer diameter dimension of the second inner conductor is reduced, and impedance matching is improved.

[0021] In (12) and (11), it is preferable that the second inner conductor is prevented from falling out by the rear end face of the second straight portion coming into face-to-face contact with the second retaining portion made of synthetic resin. According to this configuration, since the second straight portion made of metal comes into face-to-face contact with the second retaining portion made of synthetic resin, the second locking portion is less likely to bite into the second retaining portion, and the second locking portion and the second retaining portion provide a highly reliable retention function.

[0022] [Details of the embodiment of the present disclosure] [Example 1] A shielded connector according to a first embodiment of the present disclosure will be described with reference to Figures 1 to 9. Note that the present invention is not limited to these examples, but is defined by the claims, and includes all modifications within the meaning and scope equivalent to the claims. The shielded connector according to the first embodiment includes a first connector 10 and a second connector 50 that can be mated and separated from each other (see Figure 1).

[0023] Regarding the front-rear direction of the first connector 10, the Fx direction in Figs. 1-5 and 9 is defined as the front. Regarding the front-rear direction of the second connector 50, the Mx direction in Figs. 6-9 is defined as the front. The front-rear directions of the first connector 10 and the second connector 50 are opposite directions. The axial direction and the front-rear direction of the first connector 10 and the second connector 50 are used synonymously.

[0024] <First connector 10> The first connector 10 is a member having a shielding function fixed to the front end of the first shielded cable 40. As shown in Figs. 2 and 3, the first shielded cable 40 is a coaxial cable in which one first core wire 41 is surrounded by a first insulating coating 42, the first insulating coating 42 is surrounded by a first shielding layer 43 made of a braided wire or the like, and the first shielding layer 43 is surrounded by a first sheath 44. The first connector 10 has an elongated cylindrical shape in the front-rear direction as a whole. As shown in Figs. 2 and 3, the first connector 10 is configured by concentrically assembling one first inner conductor 11, one first dielectric 21 surrounding the first inner conductor 11, and a first outer conductor 32 surrounding the first dielectric 21.

[0025] As shown in FIG. 2, the first inner conductor 11 is a single component having a cylindrical first body portion 12, a first connection portion 13, and a first crimping portion 14. The first body portion 12 is formed with a first stabilizer 15 protruding radially outward from the outer circumferential surface of the first body portion 12. The first connection portion 13 extends forward in a cantilever shape from the front end of the first body portion 12, and has a shape that tapers forward as a whole. As shown in FIG. 3, the first connection portion 13 has a pair of connection spring pieces 16 that are divided in the radial direction. The first crimping portion 14 is an open barrel-shaped portion that extends backward in a cantilever shape from the rear end of the first body portion 12. The first crimping portion 14 is crimped to the first core wire 41 of the first shielded cable 40 so as to be conductive.

[0026] The first main body 12 is formed with a pair of first locking portions 17 that are point-symmetrical about the central axis of the first main body 12. The first locking portions 17 are disposed radially outward from the outer circumferential surface of the first main body 12, and are generally in a cantilever shape extending rearward. As shown in Figs. 4 and 5, the first locking portions 17 have a first tapered portion 18 and a first straight portion 19. The first tapered portion 18 is a portion that extends obliquely rearward from the outer circumferential surface of the first main body 12. The first straight portion 19 is a portion that extends rearward from the rear end of the first tapered portion 18 in parallel with the axis of the first inner conductor 11. The protruding end surface of the first straight portion 19 functions as a first locking surface 20 that is a plane perpendicular to the axis of the first inner conductor 11. The first locking portions 17 can be elastically displaced radially with the front end of the first locking portion 17 as a fulcrum.

[0027] The first dielectric 21 is made of a synthetic resin material and has a cylindrical shape that is elongated in the front-rear direction. As shown in FIG. 2, the first dielectric 21 is a single part having a first large diameter portion 22 and a first small diameter portion 23 that has a smaller diameter than the first large diameter portion 22. The first small diameter portion 23 protrudes concentrically forward from the front end of the first large diameter portion 22. The dimension of the first large diameter portion 22 in the front-rear direction is larger than the dimension of the first small diameter portion 23 in the front-rear direction. A deflection allowance space 24 that surrounds the first small diameter portion 23 is formed on the outer circumferential surface of the first dielectric 21 due to the difference in the outer diameters of the first large diameter portion 22 and the first small diameter portion 23.

[0028] As shown in Figures 3 and 4, a first housing chamber 25 is formed inside the first dielectric 21, opening at both front and rear end faces of the first dielectric 21. As shown in Figure 9, an insertion hole 26 is formed at the front end of the first dielectric 21 for inserting the second connection portion 53 of the second inner conductor 51 into the first housing chamber 25. A tapered guide surface 27 for guiding the second connection portion 53 into the insertion hole 26 is formed on the front end face of the first dielectric 21 around the entire circumference of the insertion hole 26. A first anti-rotation portion (not shown) is formed in the first large diameter portion 22, the inner circumferential surface of the first housing chamber 25 being recessed.

[0029] As shown in Figs. 3, 4 and 9, a pair of first notches 28 are formed in the first small diameter portion 23. The pair of first notches 28 are shaped point-symmetrically about the central axis of the first dielectric 21 (first small diameter portion 23). The internal space of the first notch 28 functions as a first air chamber 29 for improving impedance matching. The first notch 28 opens to the inner and outer circumferential surfaces of the first housing chamber 25 and penetrates the first small diameter portion 23 in the radial direction. The opening shape of the first notch 28 on the outer and inner circumferential surfaces of the first small diameter portion 23 is a rectangle with its long side facing the axial direction of the first small diameter portion 23. When the first small diameter portion 23 is viewed in the radial direction, the circumferential width dimension of the first notch 28 is slightly larger than the diameter dimension of the first main body portion 12 of the first inner conductor 11. Since the circumferential width dimension of the first cutout portion 28 (first air chamber 29) is larger than the outer diameter of the first main body portion 12 of the first inner conductor 11, a sufficiently large volume of the first air chamber 29 can be ensured.

[0030] The front end of the first cutout portion 28 is located rearward of the front end of the first dielectric 21 (first small diameter portion 23). The first cutout portion 28 does not open to the front end face of the first dielectric 21. The rear end of the first cutout portion 28 is at the same position as the rear end of the first small diameter portion 23 (the front end of the first large diameter portion 22) in the front-rear direction. The rear end of the opening edge of the first cutout portion 28 on the inner circumferential surface of the first dielectric 21 functions as a first removal prevention portion 30. The first removal prevention portion 30 is formed of a plane perpendicular to the axis of the first dielectric 21.

[0031] In the first housing chamber 25, the first inner conductor 11 is inserted concentrically from the rear of the first dielectric 21. In the process of inserting the first inner conductor 11, the first locking portion 17 elastically deforms due to interference with the inner peripheral surface of the first housing chamber 25. When the first inner conductor 11 reaches the correct insertion position, the first locking portion 17 elastically returns radially outward, and the first locking surface 20 of the first locking portion 17 locks against the first retaining portion 30 from the front in a face-to-face contact state. This locking action keeps the first inner conductor 11 in a retained state in which the movement of the first inner conductor 11 toward the rear relative to the first dielectric 21 is restricted. The first locking portion 17 is housed in the first cutout portion 28. The first stabilizer 15 fits into the first anti-rotation portion (not shown), so that the first inner conductor 11 is held in a position in which the rotation of the first inner conductor 11 is restricted relative to the first dielectric 21. The front end of the first cutout portion 28 is located rearward of the front end of the first connection portion 13 .

[0032] 2 and 3, the first outer conductor 32 is configured by combining a cylindrical first rear outer conductor 33 and a cylindrical first front outer conductor 34 as a whole. The first rear outer conductor 33 surrounds the front end of the first shielded cable 40 and is fixed conductively to the first shield layer 43. The rear end of the first front outer conductor 34 is fixed conductively to the first rear outer conductor 33. The first front outer conductor 34 concentrically surrounds the entire first inner conductor 11 and the entire first dielectric 21.

[0033] The first front outer conductor 34 has a cylindrical large diameter cylindrical portion 35 and a small diameter cylindrical portion 36 having a smaller diameter than the large diameter cylindrical portion 35. The small diameter cylindrical portion 36 has a cylindrical shape as a whole and extends concentrically forward from the front end of the large diameter cylindrical portion 35. The small diameter cylindrical portion 36 is formed with a plurality (three) of elastic contact pieces 37 spaced apart in the circumferential direction. The large diameter cylindrical portion 35 surrounds the first large diameter portion 22 of the first dielectric 21. The small diameter cylindrical portion 36 surrounds the first small diameter portion 23. The elastic contact pieces 37 are accommodated in the deflection allowing space 24. The elastic contact pieces 37 can be elastically displaced in the radial direction within the deflection allowing space 24.

[0034] <Second connector 50> The second connector 50 is a member having a shielding function fixed to the front end of the second shielded cable 80. As shown in Figs. 6 and 7, the second shielded cable 80 is a coaxial cable in which one second core wire 81 is surrounded by a second insulating coating 82, the second insulating coating 82 is surrounded by a second shielding layer 83 made of a braided wire or the like, and the second shielding layer 83 is surrounded by a second sheath 84. The second connector 50 has an elongated cylindrical shape in the front-rear direction as a whole. As shown in Fig. 6, the second connector 50 is configured by concentrically assembling one second inner conductor 51, one second dielectric 61 surrounding the second inner conductor 51, and a second outer conductor 72 surrounding the second dielectric 61.

[0035] As shown in Figs. 6 and 7, the second inner conductor 51 is a single component having a cylindrical second body portion 52, a second connection portion 53, and a second crimping portion 54. The outer diameter of the second body portion 52 is the same as the outer diameter of the first body portion 12 of the first inner conductor 11. The second body portion 52 is formed with a second stabilizer 55 protruding radially outward from the outer circumferential surface of the second body portion 52. The second connection portion 53 extends forward in a cantilever shape from the front end of the second body portion 52, and has a smaller diameter than the second body portion 52 and is elongated. The second crimping portion 54 is an open barrel-shaped portion extending backward in a cantilever shape from the rear end of the second body portion 52. The second crimping portion 54 is crimped to the second core wire 81 of the second shielded cable 80 so as to be conductive.

[0036] The second main body portion 52 is formed with a pair of second locking portions 57 that are symmetrical about the central axis of the second main body portion 52. The second locking portions 57 are disposed radially outward from the outer circumferential surface of the second main body portion 52, and are generally cantilevered rearward. As shown in FIG. 8, the second locking portions 57 have a second tapered portion 58 and a second straight portion 59. The second tapered portion 58 is a portion that extends obliquely rearward from the outer circumferential surface of the second main body portion 52. The second straight portion 59 is a portion that extends rearward from the rear end of the second tapered portion 58 in parallel with the axis of the second inner conductor 51. The protruding end surface of the second straight portion 59 functions as a second locking surface 60 that is a plane perpendicular to the axis of the second inner conductor 51. The second locking portions 57 are Second locking portion 57It is possible for the elastic member to be displaced in the radial direction with the front end portion as a fulcrum.

[0037] The second dielectric 61 is made of a synthetic resin material and has a cylindrical shape elongated in the front-rear direction. As shown in Figs. 6 and 7, the second dielectric 61 is a single part having a second large diameter portion 62 and a second small diameter portion 63 having a smaller diameter than the second large diameter portion 62. The second small diameter portion 63 protrudes concentrically forward from the front end of the second large diameter portion 62. The dimension of the second large diameter portion 62 in the front-rear direction is larger than the dimension of the second small diameter portion 63 in the front-rear direction. Inside the second dielectric 61, a second housing chamber 65 is formed that opens on both front and rear end faces of the second dielectric 61. An opening 66 is formed at the front end of the second dielectric 61 to allow the second connection portion 53 to protrude forward of the second dielectric 61. The second large diameter portion 62 is formed with a second anti-rotation portion (not shown) that is formed by recessing the inner circumferential surface of the second housing chamber 65.

[0038] 6, 8 and 9, the second large diameter portion 62 is formed with a pair of second cutouts 68. Second notch 68 The second cutout 68 has a shape point-symmetrical about the central axis of the second dielectric 61 (second large diameter portion 62). The internal space of the second cutout 68 functions as a second air chamber 69 for improving impedance matching. The second cutout 68 opens to the inner and outer circumferential surfaces of the second accommodating chamber 65 and penetrates the second large diameter portion 62 in the radial direction. The opening shape of the second cutout 68 on the outer and inner circumferential surfaces of the second large diameter portion 62 is a rectangle with its long side facing the axial direction of the second large diameter portion 62. When the second large diameter portion 62 is viewed in the radial direction, the circumferential width dimension of the second cutout 68 is smaller than the diameter dimension of the second main body portion 52 of the second inner conductor 51.

[0039] The front end of the second cutout 68 is located rearward of the front end of the second dielectric 61 (second large diameter portion 62). The second cutout 68 does not open to the front end face of the second dielectric 61. The front end of the second cutout 68 is located rearward of the front end of the second large diameter portion 62 (rear end of the second small diameter portion 63) in the front-to-rear direction. The rear end of the opening edge of the second cutout 68 on the inner circumferential surface of the second dielectric 61 functions as a second removal prevention portion 70. The second removal prevention portion 70 consists of a plane perpendicular to the axis of the second dielectric 61.

[0040] In the second housing chamber 65, the second inner conductor 51 is inserted concentrically from the rear of the second dielectric 61. In the process of inserting the second inner conductor 51, the second locking portion 57 elastically deforms due to interference with the inner peripheral surface of the second housing chamber 65. When the second inner conductor 51 reaches the correct insertion position, the second locking portion 57 elastically returns radially outward, and the second locking surface 60 of the second locking portion 57 locks against the second removal prevention portion 70 from the front in a face-to-face contact state. This locking action keeps the second inner conductor 51 in a retained state in which the movement of the second inner conductor 51 toward the rear relative to the second dielectric 61 is restricted. The second locking portion 57 is housed in the second cutout portion 68. The second stabilizer 55 fits into the second anti-rotation portion (not shown), so that the second inner conductor 51 is held in a positioning state in which the rotation of the second inner conductor 51 is restricted relative to the second dielectric 61.

[0041] 6 and 7, the second outer conductor 72 is configured by combining a cylindrical second rear outer conductor 73 and a cylindrical second front outer conductor 74. The second rear outer conductor 73 surrounds the front end of the second shielded cable 80 and is fixed conductively to the second shield layer 83. The rear end of the second front outer conductor 74 is fixed conductively to the second rear outer conductor 73. The second front outer conductor 74 concentrically surrounds the entire second inner conductor 51 and the entire second dielectric 61.

[0042] <Actions and Effects of Example 1> The first connector 10 and the second connector 50 are fitted together with their front ends butted against each other. When the connectors 10, 50 are fitted together, as shown in Fig. 9, the second connection portion 53 of the second inner conductor 51 is inserted between the pair of connecting spring pieces 16 of the first inner conductor 11, and the first inner conductor 11 and the second inner conductor 51 are electrically connected to each other. The elastic contact piece 37 of the first front-side outer conductor 34 is in elastic contact with the inner circumferential surface of the second front-side outer conductor 74, and the first outer conductor 32 and the second outer conductor 72 are electrically connected to each other.

[0043] The outer diameter of the second front outer conductor 74 is the same as the outer diameter of the large diameter cylindrical portion 35 of the first front outer conductor 34, and is larger than the outer diameter of the small diameter cylindrical portion 36. The inner diameter of the second front outer conductor 74 is the same as the inner diameter of the large diameter cylindrical portion 35, and is larger than the inner diameter of the small diameter cylindrical portion 36. The radial distance between the first main body portion 12 of the first inner conductor 11 and the small diameter cylindrical portion 36 of the first outer conductor 32 is narrower than the radial distance between the second main body portion 52 of the second inner conductor 51 and the second front outer conductor 74. The outer diameter of the first main body portion 12 and the outer diameter of the second main body portion 52 are the same. The radial thickness dimension of the first small diameter portion 23 surrounding the first main body portion 12 of the first dielectric 21 is smaller than the radial thickness dimension of the second large diameter portion 62 surrounding the second main body portion 52 of the second dielectric 61. Therefore, there is a concern that the impedance in the region of the first connector 10 where the first small diameter portion 23 and the small diameter cylindrical portion 36 are formed will be smaller than the impedance in the region of the second connector 50 where the second main body portion 52 is formed.

[0044] As a countermeasure against this, in this embodiment 1, the first notch 28 is formed in the first small diameter portion 23 made of synthetic resin, and the second notch 68 is formed in the second large diameter portion 62 made of synthetic resin. The circumferential width dimension of the first notch 28 is set to be larger than the circumferential width dimension of the second notch 68, and the axial length dimension of the first notch 28 is set to be larger than the axial length dimension of the second notch 68. As a result, even if the thickness of the first small diameter portion 23 is thinner than the thickness of the second large diameter portion 62, the volume of the first air chamber 29 formed in the first notch 28 is set to be larger than the volume of the second air chamber 69 formed in the second notch 68. Since the characteristic impedance of air is larger than the characteristic impedance of synthetic resin, it is possible to improve the consistency between the impedance in the formation region of the first small diameter portion 23 and the small diameter cylindrical portion 36 of the first connector 10 and the impedance in the formation region of the second main body portion 52 of the second connector 50.

[0045] The shielded connector of the first embodiment includes a first connector 10 and a second connector 50 which are connected to each other. The first connector 10 has a first inner conductor 11, a first dielectric 21 which surrounds the first inner conductor 11, and a first outer conductor 32 which surrounds the first dielectric 21. The second connector 50 has a second inner conductor 51 which is connected to the first inner conductor 11, a second dielectric 61 which surrounds the second inner conductor 51, and a second outer conductor 72 which is connected to the first outer conductor 32 while surrounding the second dielectric 61.

[0046] The radial distance between the first body portion 12 of the first inner conductor 11 and the small diameter tubular portion 36 of the first outer conductor 32 is narrower than the radial distance between the second body portion 52 of the second inner conductor 51 and the second front outer conductor 74 of the second outer conductor 72. Therefore, the characteristic impedance of the region in which the small diameter tubular portion 36 is formed in the first connector 10 is smaller than the characteristic impedance of the region in which the second body portion 52 is formed in the second connector 50. As a means for mitigating this impedance mismatch, the shielded connector of the first embodiment forms a first air chamber 29 for impedance matching in the first small diameter portion 23 of the first dielectric 21, and forms a second air chamber 69 for impedance matching in the second dielectric 61. The first air chamber 29 is a space having a shape in which the inner and outer circumferential surfaces of the first small diameter portion 23 are recessed, and penetrates the first small diameter portion 23 in the radial direction. The second air chamber 69 is a space that has a shape in which the inner circumferential surface and the outer circumferential surface of the second large diameter portion 62 are recessed and that penetrates the second large diameter portion 62 in the radial direction.

[0047] The first air chamber 29 is disposed between the first body portion 12 of the first inner conductor 11 and the small diameter cylindrical portion 36 of the first front outer conductor 34. The second air chamber 69 is disposed between the second body portion 52 of the second inner conductor 51 and the second front outer conductor 74 of the second outer conductor 72. The volume of the first air chamber 29 is set to be larger than the volume of the second air chamber 69. With this configuration, it is possible to improve the impedance matching between the first connector 10 and the second connector 50.

[0048] The first air chamber 29 (first cutout portion 28) opens into the inner peripheral surface of the first dielectric 21. A first retaining portion 30 is formed at the opening edge of the first air chamber 29. The first inner conductor 11 is adapted to be inserted into the first dielectric 21 from the rear. A first locking portion 17 is formed in the first inner conductor 11. The first inner conductor 11 is prevented from falling out by locking the first locking portion 17 with the first locking portion 30. Since the first air chamber 29 has both the function of improving impedance matching and the function of preventing the first inner conductor 11 from falling out, the shape of the first dielectric 21 can be simplified.

[0049] The second air chamber 69 (first cutout portion 28) opens to the inner peripheral surface of the second dielectric 61. A second retaining portion 70 is formed at the opening edge of the second air chamber 69. The second inner conductor 51 is adapted to be inserted into the second dielectric 61 from the rear. A second locking portion 57 is formed in the second inner conductor 51. The second inner conductor 51 is prevented from falling out by locking the second locking portion 57 with the second locking portion 70. Since the second air chamber 69 has both the function of improving impedance matching and the function of preventing the second inner conductor 51 from falling out, the shape of the second dielectric 61 can be simplified.

[0050] The first locking portion 17 elastically deforms in the radial direction during the process of inserting the first inner conductor 11 into the first dielectric 21. When the first inner conductor 11 is inserted to the correct position in the first dielectric 21, the first locking portion 17 elastically returns to its original position and locks into the first retaining portion 30. With this configuration, it is possible to reduce insertion resistance during the process of inserting the first inner conductor 11 into the first dielectric 21. When the first inner conductor 11 is inserted to the correct position, a clicking sensation caused by the elastic return action of the first locking portion 17 can be felt.

[0051] The first engaging portion 17 includes a first tapered portion 18 extending obliquely backward from the outer circumferential surface of the first inner conductor 11, First tapered portion 18 and a first straight portion 19 extending in a cantilever shape from the rear end of the first engaging portion 17 in parallel to the axis of the first inner conductor 11. With this configuration, the radial protrusion dimension of the first engaging portion 17 is kept small, so that the variation in the outer diameter dimension of the first inner conductor 11 is reduced, and impedance matching is improved.

[0052] The first inner conductor 11 is prevented from falling out by the rear end surface (first retaining surface 20) of the first straight portion 19 coming into face-to-face contact with the first retaining portion 30 made of synthetic resin. With this configuration, the first straight portion 19 made of metal comes into face-to-face contact with the first retaining portion 30 made of synthetic resin, so that the first retaining portion 17 is less likely to bite into the first retaining portion 30, and the retaining function provided by the first retaining portion 17 and the first retaining portion 30 is highly reliable.

[0053] The second locking portion 57 holds the second inner conductor 51 Second Dielectric 61 The second retaining portion 57 elastically deforms in the radial direction during the process of inserting the second inner conductor 51 into the second dielectric 61. When the second inner conductor 51 is inserted to the correct position relative to the second dielectric 61, the second retaining portion 57 elastically returns to its original position and engages with the second retaining portion 70. With this configuration, it is possible to reduce insertion resistance during the process of inserting the second inner conductor 51 into the second dielectric 61. When the second inner conductor 51 is inserted to the correct position, a clicking sensation caused by the elastic return action of the second retaining portion 57 can be felt.

[0054] The second engaging portion 57 includes a second tapered portion 58 extending obliquely rearward from the outer circumferential surface of the second inner conductor 51, Second tapered portion 58 and a second straight portion 59 extending in a cantilever shape from the rear end of the second engaging portion 57 in parallel to the axis of the first inner conductor 11. With this configuration, the radial protrusion dimension of the second engaging portion 57 is kept small, so that the variation in the outer diameter dimension of the second inner conductor 51 is reduced, and impedance matching is improved.

[0055] The rear end surface (second retaining surface 60) of the second straight portion 59 comes into face-to-face contact with the second retaining portion 70, thereby preventing the second inner conductor 51 from coming out. With this configuration, the second straight portion 59 made of metal comes into face-to-face contact with the second retaining portion 70 made of synthetic resin, so that the second retaining portion 57 is less likely to bite into the second retaining portion 70, and the retaining function provided by the second retaining portion 57 and the second retaining portion 70 is highly reliable.

[0056] The front end of the first air chamber 29 (first cutout portion 28) does not open to the front end face of the first dielectric 21, but opens only to the peripheral surfaces (inner peripheral surface and outer peripheral surface) of the first dielectric 21. A tapered guide surface 27 is formed on the front end face of the first dielectric 21 to guide the second connection portion 53 of the second inner conductor 51 into the first dielectric 21. Since the front end of the first air chamber 29 does not open to the front end face of the first dielectric 21, First Dielectric 21 Therefore, the guide surface 27 has a highly reliable guide function.

[0057] A first connection portion 13 is formed at the front end portion of the first inner conductor 11. The first connection portion 13 is connected to the second connection portion 53 of the second inner conductor 51 while being housed in the first dielectric 21. With this configuration, when the first inner conductor 11 tries to tilt obliquely, the tilt is suppressed by abutting against the inner circumferential surface of the first dielectric 21. Since the first air chamber 29 does not open to the front end surface of the first dielectric 21, the first dielectric 21 has high rigidity. As a result, the rigidity of the first dielectric 21 can reliably suppress the tilt of the first inner conductor 11.

[0058] [Other Examples] The present invention is not limited to the embodiments described above and shown in the drawings, but is indicated by the claims. The present invention includes the equivalent meaning of the claims and all modifications within the scope of the claims, including the following embodiments. The first inner conductor may be a male inner conductor having a tab, and the second inner conductor may be a female inner conductor into which the tab is inserted. The first retaining portion may be formed at a location other than the edge of the opening of the first air chamber. The first locking portion may be of a type that does not undergo elastic deformation. The first engagement portion may not have a first straight portion and may extend obliquely rearward over its entire length. The first air chamber may be a space that is open only to the inner circumferential surface of the first dielectric, or may be a space that is open only to the outer circumferential surface of the first dielectric. The width dimension of the first air chamber in the circumferential direction may be smaller than the outer diameter of the first inner conductor, or may be the same as the outer diameter of the first inner conductor. The first air chamber may have a shape that opens to the front end surface of the first dielectric body. The second retaining portion may be formed at a location other than the opening edge of the second air chamber. The second locking portion may be of a type that does not undergo elastic deformation. The second engaging portion may not have a second straight portion and may extend obliquely rearward over its entire length. The second air chamber may be a space that is open only to the inner circumferential surface of the second dielectric, or may be a space that is open only to the outer circumferential surface of the second dielectric. [Explanation of symbols]

[0059] 10…First connector 11...First inner conductor 12...First main body part 13…First connection part 14…First crimping section 15…First stabilizer 16…Connecting spring piece 17…First locking part 18…First tapered section 19…First straight section 20...First locking surface 21...First dielectric 22…First large diameter section 23...First small diameter section 24… Deflection allowance space 25…First Containment Cell 26…Insertion hole 27…Guidance surface 28…First notch 29…First air chamber 30…First retaining part 32…First outer conductor 33…First rear outer conductor 34…First front outer conductor 35…Large diameter cylinder 36…Small diameter cylinder part 37...Elastic contact piece 40…First shielded cable 41…First core wire 42…First insulating coating 43…First shield layer 44…First sheath 50…Second connector 51…Second inner conductor 52...Second main body part 53…Second connection part 54…Second crimping section 55…Second stabilizer 57...Second locking part 58…Second taper section 59…Second straight section 60...Second locking surface 61...Second dielectric 62…Second large diameter section 63…Second small diameter section 65…Second Containment Cell 66…Opening 68…Second notch 69…Second air chamber 70…Second retaining part 72…Second outer conductor 73...Second rear outer conductor 74…Second front outer conductor 80…Second shielded cable 81…Second core wire 82…Second insulating coating 83…Second shield layer 84…Second sheath

Claims

1. a first connector and a second connector that are connected to each other; the first connector has a first inner conductor, a first dielectric surrounding the first inner conductor, and a first outer conductor surrounding the first dielectric, the second connector has a second inner conductor connected to the first inner conductor, a second dielectric surrounding the second inner conductor, and a second outer conductor connected to the first outer conductor while surrounding the second dielectric, a radial distance between the first inner conductor and the first outer conductor is narrower than a radial distance between the second inner conductor and the second outer conductor, The first dielectric has a first air chamber for impedance matching formed by recessing a peripheral surface of the first dielectric, The second dielectric has a second air chamber for impedance matching formed by recessing a peripheral surface of the second dielectric, The volume of the first air chamber is greater than the volume of the second air chamber, The first air chamber opens to an inner circumferential surface of the first dielectric body, The first inner conductor is adapted to be inserted into the first dielectric from a rear side, The first inner conductor is formed with a first locking portion, A shielded connector in which the first inner conductor is prevented from coming loose by engaging the first retaining portion with a first retaining portion at an opening edge of the first air chamber.

2. The first engaging portion elastically deforms in a radial direction during the process of inserting the first inner conductor into the first dielectric, 2. The shielded connector according to claim 1, wherein when the first inner conductor is inserted into the first dielectric to a correct position, the first retaining portion elastically returns to its original position to be retained by the first retaining portion.

3. The first engaging portion is a first tapered portion extending obliquely rearward from an outer circumferential surface of the first inner conductor; 3. The shielded connector according to claim 1, further comprising a first straight portion extending in a cantilever shape from a rear end of the first tapered portion in parallel with an axis of the first inner conductor.

4. A shielded connector as described in claim 3, wherein the first inner conductor is prevented from coming out by the rear end face of the first straight portion abutting against the first anti-pullout portion in a face-to-face contact state.

5. a first connector and a second connector that are connected to each other; the first connector has a first inner conductor, a first dielectric surrounding the first inner conductor, and a first outer conductor surrounding the first dielectric, the second connector has a second inner conductor connected to the first inner conductor, a second dielectric surrounding the second inner conductor, and a second outer conductor connected to the first outer conductor while surrounding the second dielectric, a radial distance between the first inner conductor and the first outer conductor is narrower than a radial distance between the second inner conductor and the second outer conductor, The first dielectric has a first air chamber for impedance matching formed by recessing a peripheral surface of the first dielectric, The second dielectric has a second air chamber for impedance matching formed by recessing a peripheral surface of the second dielectric, The volume of the first air chamber is greater than the volume of the second air chamber, a first connection portion is formed at a front end portion of the first inner conductor and is connected to the second inner conductor while being accommodated in the first dielectric; A shielded connector, wherein a front end of the first air chamber does not open to a front end face of the first dielectric, but opens only to a peripheral surface of the first dielectric.

6. a first connector and a second connector that are connected to each other; the first connector has a first inner conductor, a first dielectric surrounding the first inner conductor, and a first outer conductor surrounding the first dielectric, the second connector has a second inner conductor connected to the first inner conductor, a second dielectric surrounding the second inner conductor, and a second outer conductor connected to the first outer conductor while surrounding the second dielectric, a radial distance between the first inner conductor and the first outer conductor is narrower than a radial distance between the second inner conductor and the second outer conductor, The first dielectric has a first air chamber for impedance matching formed by recessing a peripheral surface of the first dielectric, The second dielectric has a second air chamber for impedance matching formed by recessing a peripheral surface of the second dielectric, The volume of the first air chamber is greater than the volume of the second air chamber, a tapered guide surface is formed on a front end surface of the first dielectric to guide the second inner conductor into the first dielectric, A shielded connector, wherein a front end of the first air chamber does not open to a front end face of the first dielectric, but opens only to a peripheral surface of the first dielectric.

7. a first connector and a second connector that are connected to each other; the first connector has a first inner conductor, a first dielectric surrounding the first inner conductor, and a first outer conductor surrounding the first dielectric, the second connector has a second inner conductor connected to the first inner conductor, a second dielectric surrounding the second inner conductor, and a second outer conductor connected to the first outer conductor while surrounding the second dielectric, a radial distance between the first inner conductor and the first outer conductor is narrower than a radial distance between the second inner conductor and the second outer conductor, The first dielectric has a first air chamber for impedance matching formed by recessing a peripheral surface of the first dielectric, The second dielectric has a second air chamber for impedance matching formed by recessing a peripheral surface of the second dielectric, The volume of the first air chamber is greater than the volume of the second air chamber, The second air chamber opens to an inner circumferential surface of the second dielectric body, The second inner conductor is inserted into the second dielectric from the rear, The second inner conductor is formed with a second locking portion, A shielded connector in which the second inner conductor is prevented from coming loose by engaging the second retaining portion with a second retaining portion at an opening edge of the second air chamber.

8. The second engaging portion elastically deforms in a radial direction during the process of inserting the second inner conductor into the second dielectric, 8. The shielded connector according to claim 7, wherein when the second inner conductor is inserted into the second dielectric to a correct position, the second retaining portion elastically returns to its original position to be retained by the second retaining portion.

9. The second locking portion is a second tapered portion extending obliquely rearward from an outer circumferential surface of the second inner conductor; 9. The shielded connector according to claim 7, further comprising a second straight portion extending in a cantilever shape from a rear end of the second tapered portion in parallel to an axis of the second inner conductor.

10. A shielded connector as described in Claim 9, wherein the second inner conductor is prevented from coming out by the rear end face of the second straight portion abutting against the second anti-pullout portion in a face-to-face contact state.

11. A shielded connector described in any one of claims 1 to 10, wherein the circumferential width dimension of the first air chamber is larger than the outer diameter of the first inner conductor.

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