Coaxial Connectors

Abstract

To provide a coaxial connector capable of realizing a high frequency signal in a high frequency band.SOLUTION: A coaxial plug 10 includes a contact 1 with a three-point contact, a housing 3 having a disk portion 31 and a rectangular portion 32, and a shell 5 having a cylindrical portion 51 containing a disk portion 31 and an extending portion 52 containing the rectangular portion 32. The contact 1 has a pair of fixed terminals 11s and 11s and a movable terminal 12s which stand upright from the tip side of the top plate 11t. The disk portion 31 is arranged inside a housing chamber 31r in which a pair of fixed terminals 11s and 11s and a movable terminal 12s are formed on the disk portion 31. A pair of fixed terminals 11s and 11s are located at a pair of vertices of an imaginary equilateral triangle inscribed in the mating contact, and a movable terminal 12s is located at the other apex of the imaginary equilateral triangle, and a pair of are arranged facing each other toward the intermediate portion of the fixed terminals 11s and 11s.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a coaxial connector, and more particularly to a small coaxial connector attached to the end of a coaxial cable, which is electrically connected to the outer conductor of the coaxial cable at one end and has a cylindrical shell at the other end. [Background technology]

[0002] By connecting a coaxial connector fixed to the end of a coaxial cable to a receptacle mounted on a printed circuit board, high-frequency signals can be transmitted from the coaxial cable to the printed circuit board, or vice versa.

[0003] Generally, a coaxial cable is composed of a circular central conductor, a dielectric surrounding the central conductor, an outer conductor such as a braided wire surrounding the dielectric, and an insulating sheath that covers and protects the outer conductor.

[0004] For example, a conventional coaxial connector includes a metal shell that serves as an outer contact. The coaxial connector also includes a housing and a bellows-type contact. One end of the shell secures the insulating sheath of the coaxial cable by crimping. The other end of the shell is electrically connected to the outer conductor of the coaxial cable. The other end of the shell is cylindrical.

[0005] The housing electrically insulates the shell from the contact. The contact is arranged inside the housing, surrounded by the outer contact in a circular shape. The contact is connected to the center conductor of the coaxial cable, and the center conductor and the contact are electrically connected.

[0006] However, in the coaxial connector according to the prior art, the center conductor of the coaxial cable was electrically connected to the contact by rotating a pair of crimping pieces toward the contact mounting surface on which the center conductor of the coaxial cable was placed. Therefore, there was a possibility that the center conductor would protrude slightly from the butting surface of the pair of crimping pieces.

[0007] Due to the above-mentioned problems in the coaxial connector according to the prior art, a coaxial connector that surely prevents the center conductor from protruding from the butting surface of the pair of crimping pieces has been disclosed (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] FIG. 12 is a perspective view showing the configuration of a coaxial connector according to the prior art, and is a state diagram before connecting a coaxial cable. FIG. 14 is a longitudinal sectional view showing the configuration of a coaxial connector according to the prior art, and is a state diagram before connecting a coaxial cable. Note that FIGS. 12 and 14 of the present application correspond to FIGS. 3 and 4 of Patent Document 1.

[0010] Referring to FIG. 12 or FIG. 14, a coaxial connector (hereinafter referred to as a coaxial plug) 9 according to the prior art is attached to the terminal of a coaxial cable (not shown). The coaxial plug 9 includes a bellows-shaped contact 91, a front-round and rear-square housing 92, and a metal shell 93 serving as an external contact.

[0011] Referring to FIG. 12 or FIG. 14, the contact 91 can electrically connect a coaxial cable to a counterpart contact (not shown). The housing 92 has a pair of crimping pieces 92a and 92b that can be bent. The shell 93 has a pair of first barrels 931 and 931, a pair of second barrels 932 and 932, and a pair of third barrels 933 and 933.

[0012] Referring to FIG. 12 or FIG. 14, the contact 91 is integrally formed with the housing 92 by molding with synthetic resin. The contact 91 has a strip-shaped top plate 91t and a pair of contact pieces 91s and 91s. The base end portion side of the top plate 91t forms an installation surface 911 exposed on the surface of the housing 92. A pair of contact pieces 91s and 91s are formed on the tip end portion side of the top plate 91t. A cylindrical counterpart contact can be introduced between the pair of contact pieces 91s and 91s. And the pair of contact pieces 91s and 91s can be electrically connected to the counterpart contact.

[0013] Referring to FIG. 12 or FIG. 14, by placing the center conductor of the coaxial cable on the installation surface 911 and crimping the pair of first barrels 931 and 931, the center conductor of the coaxial cable and the contact 91 can be electrically connected with the pair of crimping pieces 92a and 92b interposed therebetween between the center conductor of the coaxial cable and the shell 93.

[0014] Referring to FIG. 12 or FIG. 14, the housing 92 has a disc portion 921 and a square portion 922. A part of the square portion 922 protrudes in the outer peripheral direction from the disc portion 921. The disc portion 921 has a cylindrical fitting portion 92s protruding in the plate thickness direction z of the housing 92. A pair of crimping pieces 92a and 92b are rotatably connected to the square portion 922.

[0015] Referring to FIG. 12 or FIG. 14, the fitting portion 92s has a contact accommodation chamber 92h at the center. The contact accommodation chamber 92h has an opening in a substantially rectangular shape on one surface of the fitting portion 92s so that the contact 91 can be introduced therein. And a pair of contact pieces 91s and 91s are arranged inside the contact accommodation chamber 92h.

[0016] Referring to FIG. 12 or FIG. 14, the fitting portion 92s can be inserted into the interior of a cylindrical shell (not shown) formed on the mating coaxial connector. By inserting the fitting portion 92s into the interior of the cylindrical shell, the cylindrical mating contact disposed at the center of the cylindrical shell and the pair of contact pieces 91s·91s can be electrically connected.

[0017] Referring to FIG. 12 or FIG. 14, the fitting portion 92s has a contact housing chamber 92h at its center. The contact housing chamber 92h is open in a substantially rectangular shape on one surface of the fitting portion 92s so as to allow the introduction of a mating contact (not shown). And the contact housing chamber 92h houses the pair of contact pieces 91s·91s therein.

[0018] Referring to FIG. 12 or FIG. 14, the shell 93 houses the housing 92 therein. The shell 93 covers the housing 92 and constitutes the outer shell of the coaxial plug 9.

[0019] Referring to FIG. 12 or FIG. 14, the shell 93 has a pair of first barrels 931·931, a pair of second barrels 932·932, and a pair of third barrels 933·933 arranged along the longitudinal direction x of the shell 93.

[0020] Referring to FIG. 12 or FIG. 14, the terminals of the coaxial cable after terminal processing are introduced from the outer circumferential direction to the bottom surfaces of the pair of second barrels 932·932 and the pair of third barrels 933·933, and by crimping the pair of second barrels 932·932, the outer conductor of the coaxial cable and the shell 93 can be electrically connected. Also, by crimping the pair of third barrels 933·933, the insulating sheath of the coaxial cable can be crimped. Thereby, the coaxial plug 9 can be fixed to the terminal of the coaxial cable.

[0021] Referring to FIG. 14 again, in the coaxial plug 9, the distance between the contact 91 (top plate 91t) and the bottom surface of the shell 93 is different between the tip end side and the base end side of the contact 91. A large difference is formed between the distance d1 between the tip end side of the contact 91 and the bottom surface of the shell 93 and the distance d2 between the base end side of the contact 91 and the bottom surface of the shell 93. On the tip end side of the contact 91, the wall thickness of the housing 92 is thin, and on the base end side of the contact 91, the wall thickness of the housing 92 is thick. That is, the relationship is d1 < d2.

[0022] Referring to FIG. 14, when the distance between the contact 91 and the bottom surface of the shell 93 is large, the impedance of the high-frequency signal flowing through the contact 91 is large, and when the distance between the contact 91 and the bottom surface of the shell 93 is small, the impedance of the high-frequency signal flowing through the contact 91 is small. When the difference between the distance d2 on the base end side of the contact 91 and the distance d1 on the tip end side of the contact 91 is large, since the impedance is not matched, unnecessary reflected waves are generated in the high-frequency signal flowing through the contact 91. As a result, there is a problem that it becomes difficult to realize in the high-frequency band of the high-frequency signal flowing through the contact 91.

[0023] There is a need for a coaxial connector that enables realization in the high-frequency band of the high-frequency signal flowing through the contact by changing the structure of the coaxial connector. And the above can be said to be the problem of the present invention.

[0024] The present invention has been made in view of such problems, and an object thereof is to provide a coaxial connector that enables realization in the high-frequency band of the high-frequency signal flowing through the contact.

Means for Solving the Problems

[0025] The inventor considered that by making the tip end side of the shell tapered so that the difference in the distance from the shell between the base end side and the tip end side of the contact is not used as much as possible, impedance mismatch can be suppressed and realization in the high-frequency band of the high-frequency signal flowing through the contact can be achieved. Based on this, the inventor has invented the following new coaxial connector.

[0026] (1) The coaxial connector according to the present invention is a coaxial connector for connecting the terminal 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, and is a contact that can be connected to a cylindrical mating contact. The contact has a pair of fixed terminals and an elastically deformable movable terminal that stand up from the tip side of a strip-shaped top plate arranged along the axial direction of the coaxial cable and are externally connected to the mating contact by three-point contact. A disk portion having a housing chamber with one surface open for introducing the mating contact and having the pair of fixed terminals and the movable terminal arranged inside, and a front-round rear-square-shaped housing having a square portion with a part protruding in the outer peripheral direction from the disk portion. A conductive shell having 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 gutter-shaped extending portion having a part protruding in the outer peripheral direction from the cylindrical portion and capable of accommodating the square portion inside. The extending portion of the shell has a bottom plate piece extending from its bottom surface and covering the bottom surface of the cylindrical portion. In a state where the disk portion is accommodated in the cylindrical portion, the bottom plate piece covers the bottom surface of the disk portion and slopes downward toward the tip of the cylindrical portion.

[0027] (2) It is preferable that 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 they are arranged in a state of facing each other toward the middle portion of the pair of fixed terminals.

[0028] (3) It is preferable that the contact is integrally formed with the housing, and 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 be contacted, and a contact edge where the ridge portions of the pair of fixed terminals are exposed in the housing chamber and the mating contact can be contacted.

[0029] (4) The coaxial connector according to the present invention further includes a crimp housing that has a slot for introducing the center conductor from the outer peripheral direction and can be inserted from the opening side of the accommodation chamber toward the rectangular portion, and the extending portion of the shell preferably 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.

Effect of the Invention

[0030] In the coaxial connector according to the present invention, by making the tip side of the shell tapered so that the difference in the distance from the shell at the base end side and the tip end side of the contact is minimized as much as possible, impedance mismatch can be suppressed, and improvement in the high-frequency band of the high-frequency signal flowing through the contact can be achieved.

Brief Description of the Drawings

[0031]

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

[0032] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. [Configuration of Coaxial Connector] First, the configuration of the coaxial connector according to an embodiment of the present invention will be described.

[0033] [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 central conductor Wc, a dielectric Di surrounding the central 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.

[0034] Referring to FIGS. 1 to 6, the coaxial plug 10 includes a contact 1 by three-point contact, a housing 3 having a front circular and rear rectangular shape, and a conductive shell 5. Further, the housing 3 has a cuboid-shaped crimp housing 7. Furthermore, the shell 5 has a pair of first barrels 521·521 and a pair of second barrels 522·522.

[0035] 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 central conductor Wc of the coaxial cable Cb (see FIG. 1).

[0036] 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 top plate 11t is arranged along the axial direction of the coaxial cable Cb. The pair of fixed terminals 11s·11s and the movable terminal 12s stand up from the tip 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).

[0037] Referring to FIG. 7, the pair of fixed terminals 11s·11s are arranged opposite to 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.

[0038] 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 central conductor Wc can come into contact. The installation surface 321 has the base end portion of the top plate 11t exposed on the upper surface of the rectangular portion 32 described later. By placing the central conductor Wc on the installation surface 321 and pushing down the crimp housing 7 toward the housing 3 (see FIG. 11), the central conductor Wc and the contact 1 can be electrically connected.

[0039] Referring to FIGS. 6 to 8, the housing 3 has a disk portion 31 and a rectangular portion 32. A part of the rectangular portion 32 projects from the disk portion 31 in the outer peripheral direction. The disk portion 31 has a housing chamber 31r at its center (see FIG. 2 or FIG. 3).

[0040] Referring to FIGS. 2 or 3 and FIG. 5, the housing chamber 31r has an opening in a rectangular shape on one surface of the housing 3 so that the central contact 2 can be introduced freely. And a pair of fixed terminals 11s·11s and a movable terminal 12s are arranged inside the housing chamber 31r.

[0041] 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.

[0042] Referring to FIG. 5, the external contact 6 can be introduced into the cylindrical portion 51 (see FIG. 1). When the external contact 6 is inserted relatively into the inside of the cylindrical portion 51, the shell 5 and the external contact 6 can be electrically connected. Also, the contact 1 and the central contact 2 can be electrically connected.

[0043] Referring to FIGS. 1 to 6, the extending portion 52 has a part of the outer periphery of the cylindrical portion 51 connected and extending substantially in parallel. And the rectangular portion 32 of the housing 3 can be accommodated inside the extending portion 52 (see FIG. 2 or FIG. 5).

[0044] 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.

[0045] Referring to FIGS. 1 to 6, when the pair of second barrels 522, 522 crimp the external conductor Wb from above the dielectric Di, 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.

[0046] 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.

[0047] (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 housing 4 made of a dielectric, and an annular external contact 6.

[0048] Referring to FIG. 1, the lead terminal 2r of the center contact 2 can be soldered to the signal pattern of the printed circuit board. The main body portion 61 of the external contact 6 has an open upper surface. Also, the main body portion 61 internally arranges the main body portion 21 of the center contact 2 coaxially so as to surround the main body portion 21. The lead terminal 6r of the external contact 6 can be soldered to the ground pattern of the printed circuit board.

[0049] 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 forming the center contact 2 and the outer contact 6 on 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.

[0050] 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.

[0051] (Configuration of Contacts) 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 the conductive metal plate, the 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.

[0052] Referring to FIG. 3(A) or FIG. 8(B), the 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.

[0053] 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. In this way, the contact 1 can make three-point contact with the center contact 2.

[0054] (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 a synthetic resin having insulating properties, and the housing 3 having a desired shape can be obtained by molding the synthetic resin having insulating properties.

[0055] 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.

[0056] 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.

[0057] Referring to FIG. 4, by reducing the difference in the distance between the contact 1 (top plate 11t) and the shell 5, the disturbance of the impedance can be suppressed. Thereby, 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 (see FIG. 12).

[0058] (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 made of a metal plate having conductivity, and it is preferable to obtain the shell 5 having a desired shape by molding a developed plate having conductivity processed into a predetermined outer shape. It is preferable that the shell 5 is formed with a cylindrical portion 51 and a gutter-shaped extending portion 52.

[0059] Further, 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 opened.

[0060] 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 to the rectangular portion 32 (see FIGS. 6 and 11(B)).

[0061] Referring to FIGS. 1 to 6, the pair of second barrels 522, 522 can crimp the external conductor Wb from above the dielectric Di. Thereby, the external 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).

[0062] (Configuration of the Crimp Housing) Next, the configuration of the crimp housing 7 according to the embodiment will be described. Referring to FIGS. 6, 9, or 11, the crimp housing 7 has a U-shaped slot 7s cut out from the bottom surface side. The central conductor Wc can be introduced into the slot 7s from the outer circumferential direction (see FIG. 11). The crimp housing 7 can be inserted from the opening side of the accommodation chamber 31r toward the rectangular portion 32.

[0063] 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 FIGS. 6 or 7, the housing 3 forms a step 32d in the rectangular portion 32 that can be locked to the lance 7r. When the crimp housing 7 is pushed into the rectangular portion 32, the lance 7r locks to the step 32d, so that the crimp housing 7 can be held in the rectangular portion 32.

[0064] Referring to FIG. 11(A), with the central 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 central conductor Wc against the installation surface 321 (see FIG. 11(A)). Thereby, the central conductor Wc can be connected to the contact 1.

[0065] The coaxial plug 10 according to the embodiment presses a pair of first barrels 521·521 using a crimp housing 7, thereby pressing the center conductor Wc against the installation surface 321. Then, the center conductor Wc is connected to the contact 1.

[0066] [Operation of the coaxial connector] Next, the operation and effects of the coaxial connector 10 according to the embodiment will be described.

[0067] 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 portions of the contact 1. Thereby, the high-frequency band of the high-frequency signal transmitted to the coaxial plug 10 can be increased.

[0068] Referring to FIG. 12, in the connector 9 according to the prior art, since the difference in the distance from the shell 93 is large between the base end portion side and the tip end portion side of the contact 91 (see FIG. 14), the characteristic curve α of the VSWR rises steeply up to the 15 GHz band, and it can be seen that the connector 9 according to the prior art can only be used up to the 6 GHz band. On the other hand, in the connector 10 according to the embodiment, since the difference in the distance from the shell 5 is small between the base end portion side and the tip end portion side of the contact 1 (see FIG. 4), the characteristic curve β of the VSWR does not exceed "1.5" up to the 60 GHz band, and it can be seen that the connector 10 according to the embodiment can be used up to the 60 GHz band.

[0069] 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 portion 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.

[0070] Referring to Fig. 11, from the state where the center conductor Wc is placed on the installation surface 321 and the crimp housing 7 is 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.

[0071] The coaxial plug 10 according to the embodiment can miniaturize the coaxial connector by changing the contact structure of the contact from a two-point contact type to a three-point contact type using a pair of fixed terminals and a movable terminal.

Description of Symbols

[0072] 1 Contact 3 Housing 5 Shell 10 Coaxial plug (coaxial connector) 11s·11s A pair of fixed terminals 11t Top plate 12s Movable terminal 31 Disc portion 31r Accommodation chamber 32 Rectangular portion 51 Cylindrical portion 52 Extension portion Cb Coaxial cable Di Dielectric Wb Outer conductor Wc Center conductor Wi Insulating 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, the contact having a pair of fixed terminals and an elastically deformable movable terminal that stand up from the tip end side of a strip-shaped top plate arranged along the axial direction of the coaxial cable and are externally connected to the mating contact by three-point contact, the pair of fixed terminals being formed by bending from the end of the top plate so as to be opposed in a direction orthogonal to the extending direction of the top plate, having a square bar shape and a ridge portion with which the mating contact contacts, and the movable terminal being arranged so as to be elastically deformable toward the middle portion of the pair of fixed terminals and opposed to the middle portion, a disk portion having an accommodation chamber with an opening on one surface for introducing the mating contact and having the pair of fixed terminals and the movable terminal arranged inside, and a front-round-and-rear-square-shaped housing having a square portion with a part protruding in the outer peripheral direction from the disk portion, a conductive shell having 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 gutter-shaped extending portion with a part protruding in the outer peripheral direction from the cylindrical portion and capable of accommodating the square portion inside, the extending portion of the shell has a bottom plate piece extending from its bottom surface and covering the bottom surface of the cylindrical portion, a coaxial connector in which, in a state where the disk portion is accommodated in the cylindrical portion, the bottom plate piece covers the bottom surface of the disk portion and slopes downward toward the tip end of the cylindrical portion.

2. 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 being opposed toward the middle portion of the pair of fixed terminals. The coaxial connector according to Claim 1.

3. The contact is integrally formed with the housing, 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 make contact, and 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. The coaxial connector according to Claim 1 or 2.

4. A crimp housing is further provided, which has a slot for introducing the central conductor from the outer circumferential direction and can be inserted from the opening side of the accommodation chamber toward the rectangular portion. 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 external conductor. The coaxial connector according to any one of claims 1 to 3.

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