Coaxial Connectors

Abstract

To provide a coaxial connector capable of reducing harness processing steps.SOLUTION: A coaxial connector 10 includes a housing 3 having a three-point contact 1, a disk portion 31, and a rectangular portion 32, and further includes a shell 5 having a cylindrical portion 51 containing the disk portion 31 and an extending portion 52 containing the rectangular portion 32, and a crimp housing 7 that can be inserted towards the rectangular portion 32, and cuts out a slot 7s that allows a center conductor Wc to be introduced from the outer peripheral direction. The contact 1 has a base end portion of a top plate 11t exposed on the upper surface of the rectangular portion 32, and has an installation surface 321 with which the center conductor Wc can come into contact. The extending portion 52 has a pair of first barrels 521, 521 that allow the crimp housing 7 to be crimped onto the rectangular portion 32. Also, the extending portion 52 has a pair of second barrels 522, 522 to which an outer conductor Wb can be crimped.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a coaxial connector. In particular, it relates to a structure of a small coaxial connector attached to the terminal of a coaxial cable, which includes a shell that is electrically connected to the outer conductor of the coaxial cable on one end side and formed in a cylindrical shape on the other end side.

Background Art

[0002] By connecting a coaxial connector fixed to the terminal of a coaxial cable to a receptacle mounted on a printed circuit board, a high-frequency signal can be transmitted from the coaxial cable to the printed circuit board. Or, a high-frequency signal can be transmitted from the printed circuit board to the coaxial cable.

[0003] Generally, a coaxial cable is composed of a circular center conductor, a dielectric surrounding the center conductor, an outer conductor such as a braided wire surrounding the dielectric, and an insulating sheath covering and protecting the outer conductor.

[0004] For example, a coaxial connector according to the prior art has reached the completion of a harness through the steps of "coaxial cable dimension cutting" → "coaxial cable terminal processing (cable stripping)" → "center conductor crimping" → "(shell bending) + (housing lid closing)" → "outer conductor crimping".

[0005] However, since a coaxial connector according to the prior art has a problem of having many assembly steps, a coaxial connector capable of reducing the assembly steps has been disclosed (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] FIG. 13 is a perspective exploded assembly view showing the configuration of a coaxial connector according to the prior art. FIG. 14 is a perspective view showing the configuration of a coaxial connector according to the prior art, and is a state diagram in which the terminal of a coaxial cable before being connected to the coaxial connector is arranged.

[0008] FIG. 15 is a perspective view showing the assembly process of a coaxial connector according to the prior art. FIG. 15(A) is a state diagram in which the base end portion of the coaxial connector is connected to the carrier, FIG. 15(B) is a state diagram in which the base end portion of the coaxial connector is separated from the carrier, FIG. 15(C) is a state diagram in which the coaxial cable is cut to a fixed size, FIG. 15(D) is a state diagram in which the outer conductor and the insulating sheath are peeled off from the end face of the coaxial cable by a predetermined length, FIG. 15(E) is a state diagram in which the terminal-processed coaxial cable is set in the coaxial connector, FIG. 15(F) is a state diagram in which the cable clamp is bent with respect to the shell, and FIG. 15(G) is a state diagram in which a plurality of barrels provided on the cable clamp are crimped.

[0009] Note that FIGS. 13 and 14 of the present application correspond to FIGS. 3 and 4 of Patent Document 1. Further, FIG. 15 of the present application corresponds to FIG. 7 of Patent Document 1.

[0010] Referring to FIG. 13 or FIG. 14, a coaxial connector (hereinafter referred to as a coaxial plug) 9 according to the prior art includes a bellows-shaped contact 91, a front-round and rear-square housing 92, and a conductive shell 93. Further, the housing 92 has a strip-shaped lid housing 921. Furthermore, the shell 93 has a cable clamp 931.

[0011] Referring to FIG. 13 or FIG. 14, the contact 91 can electrically connect a mating contact (not shown) and a coaxial cable Cb. The contact 91 has a top plate 91t formed in a substantially rectangular shape and a pair of contact pieces 91s·91s. The pair of contact pieces 91s·91s are curved from both sides of the top plate 91t, and the tip end portions are opened in a Ω shape. The pair of contact pieces 91s·91s can introduce a mating contact (not shown) therein.

[0012] Referring to FIG. 13 or FIG. 14, a pair of contact pieces 91s, 91s have a pair of opposed contacts at their tip portions. When a mating contact (not shown) is introduced inside the pair of contact pieces 91s, 91s, the pair of contacts can contact the outer periphery of the mating contact (not shown).

[0013] Referring to FIG. 13 or FIG. 14, the contact 91 has a pair of pressure contact blades 91d, 91d. The pair of pressure contact blades 91d, 91d stand up from the top plate 91t in a direction opposite to the protruding direction of the pair of contact pieces 91s, 91s. Also, the pair of pressure contact blades 91d, 91d have their blade surfaces separated by a predetermined distance.

[0014] Referring to FIG. 13 or FIG. 14, when a dielectric Di constituting the coaxial cable Cb is introduced between the pair of pressure contact blades 91d, 91d (see FIG. 14), a part of the outer periphery of the dielectric Di can be cut. Then, the pair of pressure contact blades 91d, 91d can contact the center conductor Wc.

[0015] Referring to FIG. 13 or FIG. 14, the contact 91 further includes a pair of ridge pieces 91p, 91p. These ridge pieces 91p, 91p stand up from the other sides adjacent to both sides of the top plate 91t in a direction opposite to the protruding direction of the pair of contact pieces 91s, 91s.

[0016] Referring to FIG. 13, when the pair of ridge pieces 91p, 91p are housed in the second housing chamber 922r of the housing 92, the pair of ridge pieces 91p, 91p can position the contact 91 in the housing 92 (see FIG. 14).

[0017] Referring to FIG. 13 or FIG. 14, the housing 92 has a disc portion 922 and a square portion 923. A part of the square portion 923 protrudes in the outer peripheral direction from the disc portion 922. The disc portion 922 has a first housing chamber 92a at its center (see FIG. 13).

[0018] Referring to FIG. 13, the first accommodation chamber 92a has a rectangular opening on one surface of the housing 92 so that a mating contact (not shown) can be introduced therein. And a pair of contact pieces 91s, 91s are disposed inside the first accommodation chamber 92a.

[0019] Referring to FIG. 13, the housing 92 has a U-shaped opening on the other surface for the second accommodation chamber 922r. The inner part of the second accommodation chamber 922r communicates with the first accommodation chamber 92a. Referring to FIG. 13, the contact 91 can be introduced into the inner part of the second accommodation chamber 922r from the protruding direction of the pair of contact pieces 91s, 91s.

[0020] Referring to FIGS. 13 or 14, the shell 93 has a cylindrical portion 932 and a pair of extending pieces 933, 933. The cylindrical portion 932 can accommodate the disc portion 922 of the housing 92 toward one surface of the cylindrical portion 932 from the same direction as the protruding direction of the pair of contact pieces 91s, 91s.

[0021] Referring to FIG. 13, the pair of extending pieces 933, 933 are continuously and substantially parallelly extended from a part of the outer periphery of the cylindrical portion 932. And the square portion 923 of the housing 92 can be accommodated inside the pair of extending pieces 933, 933.

[0022] Referring to FIGS. 13 or 14, one end of the lid housing 921 is flexibly connected to a part of the disc portion 922 by a hinge. And the other end side of the lid housing 921 can open and close the second accommodation chamber 923r.

[0023] Referring to FIG. 13, the cable clamp 931 has a bottom plate piece 93b. One end of the bottom plate piece 93b is flexibly connected to a part of the cylindrical portion 932 by a hinge 93h. Also, the other end side of the bottom plate piece 93b can open and close the other surface of the shell ⑨3 in conjunction with the lid housing 921 (see FIG. 14).

[0024] Referring to FIG. 13 or FIG. 14, the lid housing 921 has a ridge 92d on the tip side. The ridge 92d protrudes from one surface of the lid housing 921.

[0025] Referring to FIG. 14, when the dielectric Di of the coaxial cable Cb is disposed in the rectangular portion 923 of the housing 92 and the bottom plate piece 93b of the cable clamp 931 closes the other surface of the shell 93, the ridge 92d presses the dielectric Di toward the pair of pressure contact blades 91d·91d, so that the contact 91 can be pressure contact-connected to the center conductor Wc.

[0026] Referring to FIG. 13 or FIG. 14, the cable clamp 931 includes a pair of conductor barrels 93c·93c and a pair of insulation barrels 93i·93i. The pair of conductor barrels 93c·93c can crimp the outer conductor Wb. And the pair of conductor barrels 93c·93c can electrically connect the outer conductor Wb and the shell 93.

[0027] Referring to FIG. 13 or FIG. 14, the pair of insulation barrels 93i·93i can crimp the insulation sheath Wi. And the pair of insulation barrels 93i·93i can fix the coaxial plug 9 to the terminal of the coaxial cable Cb.

[0028] Referring to FIG. 13 or FIG. 14, the cable clamp 931 further includes a pair of crimp barrels 93a·93a. The pair of crimp barrels 93a·93a can crimp the rectangular portion 923 via a pair of extending pieces 933·933.

[0029] Referring to FIG. 13 or FIG. 14, the coaxial plug 9 according to the prior art is provided with a ridge 92d on the lid housing 921 that can press the dielectric Di toward the pair of pressure contact blades 91d·91d to pressure contact-connect the contact 91 to the center conductor Wc when the cable clamp 931 closes the other surface of the shell 93, so that the process of center conductor pressure contact and the process of shell bending can be integrated.

[0030] Next, the assembly process of the coaxial plug 9 according to the prior art will be described. First, referring to FIG. 15(A), with the tip of the deployed cable clamp 931 connected to the strip-shaped carrier C, the housing 92 with the contact 91 is assembled to the deployed shell 93. Next, referring to FIG. 15(B), the coaxial plug 9 is detached from the carrier C.

[0031] On the other hand, referring to FIG. 15(C), the coaxial cable Cb is cut to a predetermined size in advance. Next, referring to FIG. 15(D), the insulating sheath Wi is peeled off from the end face of the coaxial cable Cb by a predetermined length. Also, the outer conductor Wb is peeled off from the end face of the coaxial cable Cb by a predetermined length. In this way, the coaxial cable Cb is pre-treated at the terminals.

[0032] Next, referring to FIG. 15(E), using a jig or machine (not shown), the dielectric Di of the coaxial cable Cb that has been treated at the terminals is placed in the rectangular portion 923 of the housing 92 (see FIG. 14). In the state shown in FIG. 15(E), the cable clamp 931 stands up with respect to the shell 93.

[0033] Next, as shown in FIG. 14, with respect to the shell 93, the cable clamp 931 is bent from the state where it stands up toward the other surface of the shell 93.

[0034] Referring to FIG. 15(F), when the bottom plate piece 93b of the cable clamp 931 closes the other surface of the shell 93, the ridge 92d of the lid housing 921 presses the dielectric Di toward the pair of pressure contact blades 91d·91d (see FIG. 14), and the contact 91 can be pressure contact-connected to the center conductor Wc. Thereby, the contact 91 and the coaxial cable Cb can be reliably connected mechanically and electrically.

[0035] Next, referring to FIG. 14, by crimping the pair of crimp barrels 93a·93a to the rectangular portion 923 via the pair of extending pieces 933·933, the pressure contact state of the contact 91 can be maintained.

[0036] Also, referring to FIG. 13 or FIG. 14, by crimping a pair of conductor barrels 93c·93c to the external conductor Wb, the external conductor Wb and the shell 93 can be electrically connected. Further, referring to FIG. 13 or FIG. 14, by crimping a pair of insulation barrels 93i·93i to the insulating sheath Wi, the coaxial plug 9 can be fixed to the terminal of the coaxial cable Cb. Then, a series of assembly operations are completed (see FIG. 15(G)).

[0037] Thus, the coaxial plug 9 according to the prior art reaches the completion of the harness through the steps of "coaxial cable dimension cutting" → "coaxial cable terminal processing (cable stripping)" → "(shell bending)+(housing lid closing)+(center conductor pressure contact)" → "external conductor pressure contact".

[0038] The coaxial plug 9 according to the prior art is provided with a ridge 92d on the lid housing 921 that can press the dielectric Di against a pair of pressure contact blades 91d·91d to press-contact the contact 91 to the center conductor Wc when the cable clamp 931 closes the other surface of the shell 93. Therefore, it is said that the steps of center conductor pressure contact and shell bending can be integrated.

[0039] However, referring to FIGS. 15(E) to 15(G), the coaxial plug 9 according to the prior art connects the center conductor Wc by crimping a pair of crimp barrels 93a·93a to the square portion 923 through the step of bending the cable clamp 931. Therefore, there are still many harness processing steps, and there is a problem that it is not easy to reduce the manufacturing cost of the harness using the coaxial plug 9 according to the prior art.

[0040] There is a need for a coaxial connector that can reduce the harness processing steps and contribute to the reduction of manufacturing cost by changing the connection structure of the center conductor provided in the coaxial connector. And the above can be said to be the problem of the present invention.

[0041] The present invention has been made in view of such problems, and an object thereof is to provide a coaxial connector capable of reducing the harness processing steps.

Means for Solving the Problem

[0042] The inventor holds a crimp housing with a notch of a slot into which a center conductor can be introduced from the outer peripheral direction in the housing, and bends a pair of crimp barrels formed on the shell, so as to think that the center conductor can be connected to the installation surface of the contact. Based on this, the inventor has invented the following new coaxial connector capable of reducing the harness processing steps.

[0043] (1) The coaxial connector according to the present invention is a coaxial connector for connecting a terminal of a coaxial cable having a center conductor, a dielectric surrounding the center conductor, an outer conductor covering the dielectric, and an insulating sheath covering the outer conductor, and is a contact that can be connected to a cylindrical mating contact. The contact has a pair of fixed terminals standing up from the tip end side of a strip-shaped top plate and a movable terminal capable of elastic deformation, which are externally connected to the mating contact by three-point contact. A disk portion having an accommodation chamber with one surface opened so that the mating contact can be introduced freely and having the pair of fixed terminals and the movable terminal disposed therein, and a front circular and rear rectangular housing having a rectangular portion with a part protruding in the outer peripheral direction from the disk portion. A cylindrical portion capable of accommodating the disk portion toward one surface from the same direction as the direction in which the pair of fixed terminals protrude, and a conductive shell having a gutter-shaped extending portion with a part protruding in the outer peripheral direction from the cylindrical portion and capable of accommodating the rectangular portion therein. A crimp housing having a slot into which the center conductor can be introduced from the outer peripheral direction and inserted from the opening side of the accommodation chamber toward the rectangular portion. The contact has a base end portion of the top plate exposed on the upper surface of the rectangular portion and an installation surface where the center conductor can be contacted. The extending portion of the shell includes a pair of first barrels capable of crimping the crimp housing to the rectangular portion and a pair of second barrels capable of crimping the outer conductor.

[0044] (2) It is preferable that the crimp housing has a pair of lances disposed across the slot at one end, and the housing forms a step on the rectangular portion that can be locked to the pair of lances.

[0045] (3) The pair of the fixed terminals are located at a set of vertices of a virtual equilateral triangle inscribed in the mating contact, and the movable terminal is located at the other vertex of the virtual equilateral triangle, and it is preferably arranged in a state of facing toward the middle part between the pair of the fixed terminals.

[0046] (4) The contact is integrally formed with the housing, and the contact preferably has a contact edge where the ridge parts of the pair of the fixed terminals are exposed to the accommodation chamber of the housing and the mating contact can be contacted.

Advantages of the Invention

[0047] The coaxial connector according to the present invention holds a crimp housing having a slot for introducing a center conductor from the outer peripheral direction in the housing, and by bending a pair of first barrels formed on the shell, the center conductor can be connected to the installation surface of the contact. Thereby, the harness processing step can be reduced.

Brief Description of the Drawings

[0048]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Best Mode for Carrying Out the Invention

[0049] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. [Configuration of Coaxial Connector] First, the configuration of a coaxial connector according to an embodiment of the present invention will be described.

[0050] (Overall Configuration) Referring to FIGS. 1 to 6, a coaxial connector (hereinafter referred to as a coaxial plug) 10 according to an embodiment of the present invention can connect the terminal of a coaxial cable Cb. The coaxial cable Cb has a center conductor Wc, a dielectric Di surrounding the center conductor Wc, an outer conductor Wb such as a braided wire covering the dielectric Di, and an insulating sheath Wi covering the outer conductor Wb.

[0051] Referring to FIGS. 1 to 6, the coaxial plug 10 includes a contact 1 by three-point contact, a housing 3 having a front-round and rear-square shape, and a conductive shell 5. Further, the housing 3 has a rectangular parallelepiped-shaped crimp housing 7. Furthermore, the shell 5 has a pair of first barrels 521·521 and a pair of second barrels 522·522.

[0052] Referring to FIGS. 2 or 4 and FIGS. 6 or 7, the contact 1 can electrically connect a cylindrical center contact 2 serving as a mating contact and the center conductor Wc of the coaxial cable Cb (see FIG. 1).

[0053] Referring to FIG. 7, the contact 1 has a top plate 11t formed in a strip shape, a pair of fixed terminals 11s·11s, and an elastically deformable movable terminal 12s. The pair of fixed terminals 11s·11s and the movable terminal 12s stand up from the tip end side of the top plate 11t. The center contact 2 can be introduced into the space surrounded by the pair of fixed terminals 11s·11s and the movable terminal 12s (see FIG. 1).

[0054] Referring to FIG. 7, a pair of fixed terminals 11s·11s are arranged to face each other in a direction substantially orthogonal to the direction in which the top plate 11t extends. The movable terminal 12s is arranged in a state of facing toward the middle part of the pair of fixed terminals 11s·11s. When the center contact 2 is introduced into the space surrounded by the pair of fixed terminals 11s·11s and the movable terminal 12s, the pair of fixed terminals 11s·11s and the movable terminal 12s can be externally connected to the outer periphery of the center contact 2 by three-point contact.

[0055] Referring to FIGS. 2 to 6, the contact 1 is integrally formed with the housing 3. The contact 1 has an installation surface 321 where the center conductor Wc can come into contact. The installation surface 321 is such that the base end portion of the top plate 11t is exposed on the upper surface of a square portion 32 described later. By placing the center conductor Wc on the installation surface 321 and pushing down the crimp housing 7 toward the housing 3 (see FIG. 11), the center conductor Wc and the contact 1 can be electrically connected.

[0056] Referring to FIGS. 6 to 8, the housing 3 has a disk portion 31 and a square portion 32. A part of the square portion 32 projects in the outer peripheral direction from the disk portion 31. The disk portion 31 has a housing chamber 31r at the center (see FIG. 2 or FIG. 3).

[0057] Referring to FIGS. 2 or 3 and FIG. 5, the housing chamber 31r has a rectangular opening on one surface of the housing 3 so that the center contact 2 can be introduced therein freely. And a pair of fixed terminals 11s·11s and a movable terminal 12s are arranged inside the housing chamber 31r.

[0058] Referring to FIG. 5, the shell 5 has a cylindrical portion 51 and a gutter-shaped extending portion 52. The cylindrical portion 51 can accommodate the disk portion 31 of the housing 3 from the same direction as the direction in which the pair of fixed terminals 11s·11s project, toward one surface of the cylindrical portion 51.

[0059] Referring to FIG. 5, the cylindrical portion 51 can introduce the external contact 6 therein (see FIG. 1). When the external contact 6 is relatively inserted into the cylindrical portion 51, the shell 5 and the external contact 6 can be electrically connected. Also, the contact 1 and the center contact 2 can be electrically connected.

[0060] Referring to FIGS. 1 to 6, the extending portion 52 is formed by connecting a part of the outer periphery of the cylindrical portion 51 and extending substantially in parallel. And the square portion 32 of the housing 3 can be accommodated inside the extending portion 52 (see FIG. 2 or FIG. 5).

[0061] Referring to FIGS. 1 to 6, the extending portion 52 has a pair of first barrels 521·521 and a pair of second barrels 522·522. The pair of first barrels 521·521 can crimp the crimp housing 7 to the square portion 32. The pair of second barrels 522·522 can crimp the external conductor Wb from above the dielectric Di.

[0062] Referring to FIGS. 1 to 6, by crimping the external conductor Wb from above the dielectric Di with the pair of second barrels 522·522, the external conductor Wb and the shell 5 can be electrically connected. Also, the coaxial plug 10 can be fixed to the terminal of the coaxial cable Cb.

[0063] Referring to FIGS. 1 to 6, the extending portion 52 has a bottom plate piece 52b that extends from its bottom surface and covers the bottom surface of the cylindrical portion 51. In a state where the disk portion 31 is accommodated in the cylindrical portion 51, the bottom plate piece 52b covers the bottom surface of the disk portion 31. Referring to FIG. 4, the bottom plate piece 52b is inclined downward toward the tip. In other words, the bottom surface of the cylindrical portion 51 is inclined downward toward the side opposite to the square portion 32.

[0064] (Configuration of the mating connector) Next, the configuration of the receptacle (mating connector) 20 to which the coaxial plug 10 according to the embodiment is connected will be described. Referring to FIG. 1, the receptacle 20 according to the embodiment is surface-mounted on a printed circuit board (not shown). The receptacle 20 includes a cylindrical center contact 2 with a closed tip, a dielectric housing 4, and an annular outer contact 6.

[0065] Referring to FIG. 1, the center contact 2 can solder its lead terminal 2r to the signal pattern of the printed circuit board. The outer contact 6 has an open upper surface of its main body 61. Also, the main body 61 coaxially internally arranges the main body 21 of the center contact 2 so as to surround the main body 21 of the center contact 2. The outer contact 6 can solder its lead terminal 6r to the ground pattern of the printed circuit board.

[0066] Referring to FIG. 1, the housing 4 is formed in a rectangular plate shape. The housing 4 fixes the center contact 2 and the outer contact 6 by integrally molding the center contact 2 and the outer contact 6 in the housing 4. Inside the housing 4, the housing 4 is filled so as to electrically insulate the center contact 2 and the outer contact 6.

[0067] Referring to FIG. 1, when the coaxial plug 10 is connected to the receptacle 20, the center conductor Wc inherent in the coaxial cable Cb can be connected to the center contact 2, and the outer conductor Wb inherent in the coaxial cable Cb can be connected to the outer contact 6. Then, a high-frequency signal can be transmitted from the coaxial cable Cb to the printed circuit board, and a high-frequency signal can be transmitted from the printed circuit board to the coaxial cable Cb.

[0068] (Configuration of Contact) Next, the configuration of the contact 1 according to the embodiment will be described. Referring to FIG. 7, the contact 1 is preferably made of a conductive metal plate, and by punching and bending a conductive metal plate, a contact 1 with a three-point contact of a desired shape can be obtained. The contact 1 is preferably made of a copper alloy, but is not limited to a copper alloy.

[0069] Referring to FIG. 3(A) or FIG. 8(B), a pair of fixed terminals 11s·11s are located at a set of vertices of a virtual equilateral triangle inscribed in the center contact 2. On the other hand, the movable terminal 12s is located at the other vertex of the virtual equilateral triangle. And the movable terminal 12s is arranged in a state of facing toward the middle part of the pair of fixed terminals 11s·11s.

[0070] Referring to FIG. 1 or FIGS. 3(A) and 8(B), when the center contact 2 is inserted into the accommodation chamber 31r of the disk portion 31, the outer periphery of the center contact 2 can contact the ridge portions of the pair of fixed terminals 11s·11s exposed in the accommodation chamber 31r. Also, the outer periphery of the center contact 2 can contact the movable terminal 12s. Thus, the contact 1 can make three-point contact with the center contact 2.

[0071] (Configuration of the housing) Next, the configuration of the housing 3 according to the embodiment will be described. Referring to FIGS. 2 to 8, the housing 3 is preferably made of an insulating synthetic resin, and the housing 3 having a desired shape can be obtained by molding an insulating synthetic resin.

[0072] Referring to FIG. 4, in the coaxial plug 10, the distance between the contact 1 (top plate 11t) and the bottom surface of the shell 5 is substantially the same on the tip end side and the base end side of the contact 1. The bottom surface of the cylindrical portion 51 is inclined downward toward the side opposite to the square portion 32.

[0073] Referring to FIG. 4, the difference between the distance D1 between the tip end side of the contact 1 and the bottom surface of the shell 5 and the distance D2 between the base end side of the contact 1 and the bottom surface of the shell 5 is formed to be small. The wall thickness of the housing 3 is substantially the same on the tip end and base end sides of the contact 1. That is, it is in the relationship of D1≒D2.

[0074] Referring to FIG. 4, by reducing the difference in the distance between the contact 1 (top plate 11t) and the shell 5, impedance fluctuations can be suppressed. As a result, the high-frequency band of the high-frequency signal transmitted to the coaxial plug 10 can be increased. For example, the VSWR (voltage standing wave ratio) can be suppressed to less than "1.5" up to 60 GHz.

[0075] (Configuration of the shell) Next, the configuration of the shell 5 according to the embodiment will be described. Referring to FIGS. 1 to 6, the shell 5 is preferably formed of a conductive metal plate by forming a conductive developed plate processed into a predetermined outer shape to obtain a shell 5 having a desired shape. The shell 5 preferably forms a cylindrical portion 51 and a gutter-shaped extending portion 52.

[0076] Also, referring to FIG. 5, it is preferable to perform bending forming on the extending portion 52 with a pair of first barrels 521·521 and a pair of second barrels 522·522 in an open state.

[0077] Referring to FIGS. 1 to 6, the extending portion 52 includes a pair of first barrels 521·521 and a pair of second barrels 522·522. The pair of first barrels 521·521 can crimp the crimp housing 7 to the square portion 32 (see FIGS. 6 and 11(B)).

[0078] Referring to FIGS. 1 to 6, the pair of second barrels 522·522 can crimp the outer conductor Wb from above the dielectric Di. As a result, the outer conductor Wb and the shell 5 can be electrically connected. And the pair of second barrels 522·522 can fix the coaxial connector 10 to the terminal of the coaxial cable Cb (see FIG. 1).

[0079] (Configuration of the crimp housing) Next, the configuration of the crimp housing 7 according to the embodiment will be described. Referring to FIG. 6 or FIGS. 9 and 11, the crimp housing 7 has a U-shaped slot 7s cut out from the bottom surface side. The center conductor Wc can be introduced into the slot 7s from the outer peripheral direction (see FIG. 11). The crimp housing 7 can be inserted from the opening side of the accommodation chamber 31r toward the square portion 32.

[0080] Referring to FIG. 10, the crimp housing 7 is provided with a pair of lances 7r·7r at one end. The pair of lances 7r·7r are arranged across the slot 7s. On the other hand, referring to FIG. 6 or FIG. 7, the housing 3 forms a step 32d engageable with the lance 7r in the square portion 32. When the crimp housing 7 is pushed into the square portion 32, the lance 7r engages with the step 32d, thereby holding the crimp housing 7 in the square portion 32.

[0081] Referring to FIG. 11(A), with the center conductor Wc placed on the installation surface 321 and the crimp housing 7 held in the square portion 32, by crimping the pair of first barrels 521·521, the bottom of the slot 7s can press the center conductor Wc against the installation surface 321 (see FIG. 11(A)). Thereby, the center conductor Wc can be connected to the contact 1.

[0082] The coaxial plug 10 according to the embodiment presses the center conductor Wc against the installation surface 321 by using the crimp housing 7 to crimp the pair of first barrels 521·521. And the center conductor Wc is connected to the contact 1.

[0083] [Operation of Coaxial Connector] Next, while explaining the assembly process of the coaxial connector 10 according to the embodiment, the operation and effects of the coaxial connector 10 according to the embodiment will be explained.

[0084] First, referring to FIG. 12, with the pair of first barrels 521·521 and the pair of second barrels 522·522 in a deployed state (see FIG. 5), with a part of the bottom of the second barrels 522·522 connected to the strip-shaped carrier C, assemble the housing 3 with the contact 1 into the deployed shell 5. Also, hold the crimp housing 7 in the square portion 32 (see FIG. 11(A)). Next, referring to FIG. 12, disconnect the coaxial plug 10 from the carrier C.

[0085] Next, referring to FIG. 12, the center conductor Wc of the coaxial cable Cb that has been terminal-processed is placed on the installation surface 321 (see FIG. 8(B)), and the outer conductor Wb of the coaxial cable Cb that has been terminal-processed is placed on the bottom of the second barrels 522·522 (see FIG. 5).

[0086] From the state shown in FIG. 11(A), by crimping the pair of first barrels 521·521 to the rectangular portion 32, the crimp housing 7 presses the center conductor Wc against the installation surface 321, and the center conductor Wc can be connected to the contact 1 (see FIG. 11(B)).

[0087] Also, by the pair of second barrels 522·522 crimping the outer conductor Wb from above the dielectric Di, the outer conductor Wb and the shell 5 can be electrically connected. Also, the coaxial plug 10 can be fixed to the terminal of the coaxial cable Cb. Then, a series of assembly operations are completed.

[0088] The coaxial plug 10 according to the embodiment can connect the center conductor Wc to the contact 1 by crimping the pair of first barrels 521·521 to the pair of first barrels 521·52 rectangular portion 32 without going through the process of bending the cable clamp. Thereby, the coaxial plug 10 according to the embodiment can reduce the harness processing process and contribute to the reduction of manufacturing costs.

[0089] Also, referring to FIGS. 1 to 9, the coaxial plug 10 according to the embodiment circumscribes the center contact 2 by three-point contact, and a pair of fixed terminals 11s·11s located at a set of vertices of a virtual equilateral triangle, and located at the other vertex of the virtual equilateral triangle and elastically displaceable toward the middle part of the pair of fixed terminals 11s·11s. Since the contact 1 is constituted by the movable terminal 12s, the coaxial connector can be miniaturized.

[0090] Referring to FIG. 4, the coaxial plug 10 according to the embodiment can suppress impedance disturbance by reducing the difference in the distance between the contact 1 (top plate 11t) and the shell 5 at the tip and base end sides of the contact 1. Thereby, the high-frequency band of the high-frequency signal transmitted to the coaxial plug 10 can be increased.

[0091] Referring to FIG. 11, with the center conductor Wc placed on the installation surface 321 and the crimp housing 7 held in the rectangular portion 32, by crimping the pair of first barrels 521·521, the bottom of the slot 7s can press the center conductor Wc against the installation surface 321 (see FIG. 11(A)). Thereby, the center conductor Wc can be connected to the contact 1.

[0092] The coaxial connector according to the present invention holds a crimp housing having a slot notched to allow introduction of a center conductor from the outer peripheral direction in a housing, and by bending a pair of first barrels formed on a shell, the center conductor can be connected to the installation surface of a contact. Thereby, the harness processing steps can be reduced.

Explanation of Reference Numerals

[0093] 1 Contact 3 Housing 5 Shell 7 Crimp Housing 7s Slot 10 Coaxial Plug (Coaxial Connector) 11s·11s Pair of Fixed Terminals 11t Top Plate 12s Movable Terminal 31 Disk Portion 31r Accommodation Chamber 32 Rectangular Portion 51 Cylindrical Portion 52 Extension Portion 321 Installation Surface 521·521 Pair of First Barrels 522·522 Pair of Second Barrels Cb Coaxial Cable Di Dielectric Wb Outer Conductor Wc Center Conductor Wi Insulation Sheath

Claims

1. A coaxial connector for connecting the terminals of a coaxial cable having a central conductor, a dielectric surrounding the central conductor, an outer conductor covering the dielectric, and an insulating sheath covering the outer conductor, a contact that can be connected to a cylindrical mating contact, which circumscribes the mating contact by three-point contact and has a pair of fixed terminals standing up from the tip end side of a strip-shaped top plate and a movable terminal that can be elastically deformed, and a pair of the fixed terminals are bent from the end of the top plate so as to be arranged opposite to each other in a direction orthogonal to the direction in which the top plate extends, and has a square bar shape and a ridge portion where the mating contact contacts, and the movable terminal is arranged so as to be elastically deformable toward the middle portion between the pair of fixed terminals and facing the middle portion, a disk portion having an accommodation chamber with an opening on one side into which the pair of fixed terminals and the movable terminal are arranged, and a front-round-and-rear-square-shaped housing having a square portion protruding in the outer peripheral direction from a part of the disk portion, a conductive shell having a cylindrical portion capable of accommodating the disk portion from the same direction as the direction in which the pair of fixed terminals protrude toward one surface, and a gutter-shaped extending portion protruding from a part of the cylindrical portion in the outer peripheral direction and capable of accommodating the square portion inside, a crimp housing having a slot for introducing the central conductor from the outer peripheral direction and capable of being inserted from the opening side of the accommodation chamber toward the square portion, the contact has an installation surface where the base end portion of the top plate is exposed on the upper surface of the square portion and the central conductor can contact, the extending portion of the shell, a pair of first barrels capable of crimping the crimp housing to the square portion, a pair of second barrels capable of crimping the outer conductor, and includes a coaxial connector.

2. The crimp housing has a pair of lances arranged across the slot at one end, The housing forms a step in the square portion that can be locked to the pair of lances. The coaxial connector according to claim 1.

3. The pair of fixed terminals are located at a set of vertices of a virtual equilateral triangle inscribed in the mating contact, The movable terminal is located at the other vertex of the virtual equilateral triangle and is arranged in a state of facing toward the middle portion between the pair of fixed terminals. The coaxial connector according to claim 1 or 2.

4. The contact is integrally formed with the housing, The coaxial connector according to any one of claims 1 to 3, wherein the contact has a contact edge where the ridge portions of the pair of fixed terminals are exposed in the accommodation chamber of the housing and the mating contact can make contact.

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