Coaxial connector

Abstract

A coaxial connector capable of realizing a high-frequency signal in a high-frequency band is provided. A coaxial plug (10) includes a contact (1) based on three-point contact, a housing (3) having a first connection base portion and a second connection base portion, and a shell (5) having a cylindrical portion that houses the first connection base portion and an extension portion that houses the second connection base portion and covers one side of an opening of the cylindrical portion. The contact has a setting surface extending from a base end portion side of a metal plate and a pair of fixed terminals and a movable terminal standing from a tip end portion side of the metal plate. Each terminal is disposed inside a housing chamber that is open on one side of the first connection base portion. The base plate has an inclined surface that is higher on the base end portion side of the metal plate and lower on the tip end portion side of the metal plate. The distance between the metal plate of the contact and the bottom surface of the shell, which is separated by the insulating material of the housing, is the same on the tip end portion side and the base end portion side of the contact.

Description

TECHNICAL FIELD

[0001] The present application relates to a coaxial connector. In particular, it relates to a configuration of a coaxial connector which is a small coaxial connector configured at a terminal of a coaxial cable, and which has a shell which is electrically connected to an outer conductor of the coaxial cable at one end portion side and which is formed in a cylindrical shape at the other end portion side. BACKGROUND

[0002] By connecting the coaxial connector fixed to the terminal of the coaxial cable to the socket mounted to the printed board, it is possible to transmit a high frequency signal from the coaxial cable to the printed board. Alternatively, it is possible to transmit a high frequency signal from the printed board to the coaxial cable.

[0003] Generally, the coaxial cable is configured of a circular center conductor, a dielectric which surrounds the periphery of the center conductor, an outer conductor such as a braided wire which surrounds the periphery of the dielectric, and an insulating sheath which covers and protects the outer conductor.

[0004] For example, the conventional coaxial connector has a shell made of metal which becomes an outer contact. In addition, the coaxial connector has a shell body and a bellows-shaped contact. The insulating sheath of the coaxial cable is fixed by crimping at one end portion side of the shell. In addition, the shell is electrically connected to the outer conductor of the coaxial cable at the one end portion side thereof. In addition, the other end portion side of the shell is formed in a cylindrical shape (for example, refer to Patent Document 1).

[0005] According to Patent Document 1, the shell and the contact are electrically insulated by the shell body. The contact is disposed inside the shell body in a state of being surrounded in a circular ring shape by the outer contact of a portion of the shell. The contact is integrally molded with the shell body by molding using synthetic resin (insulating resin). A disc portion is provided in the shell body such that a cylindrical fitting portion protrudes in a plate thickness direction, and the contact is disposed in a contact housing chamber which is opened at one face side of the disc portion.

[0006] The contact has a band-shaped metal plate, a base end portion side of which is a setting surface of the center conductor of the coaxial cable and which is exposed to the surface of the shell body. At a tip end portion side of the metal plate, a pair of contact pieces are provided in an opposite manner from the metal plate in a substantially vertical direction. When the counterpart contact is inserted between the pair of contact pieces, the pair of contact pieces expand in a substantially horizontal direction toward a direction of separating from each other, and the counterpart contact is clamped by the spring property (elasticity) of the pair of contact pieces. Thus, the pair of contact pieces and the counterpart contact are more reliably contacted and electrically connected.

[0007] In the contact integrally formed with the housing, the metal plate of the contact is bent between the base end portion side and the tip end portion side, and is not horizontal. The distance between the metal plate of the contact filled with the insulating resin and the bottom surface of the housing is different between the base end portion side and the tip end portion side of the contact. In the structure of Patent Document 1, when the distance between the tip end portion side of the contact where the contact piece is present and the bottom surface of the housing is d1, and the distance between the base end portion side of the contact where the surface to be provided is present and the bottom surface of the housing is d2, the thickness of the housing at the tip end portion side of the contact is small, and the thickness of the housing at the base end portion side of the contact is large. That is, a relationship of d1 < d2 is present.

[0008] Prior Art Documents

[0009] Patent Document 1: Japanese Patent Application Publication No. 2019-169361 SUMMARY

[0010] Problems to be Solved by the Invention

[0011] With regard to the distance between the metal plate of the contact filled with the insulating resin and the bottom surface of the housing, the greater the distance between the contact and the bottom surface of the housing, the greater the impedance of the high-frequency signal flowing in the contact, and the smaller the distance between the contact and the bottom surface of the housing, the smaller the impedance of the high-frequency signal flowing in the contact. Therefore, in the case where the difference between the distance d2 and the distance d1 is large, the impedance is not matched, and thus unnecessary reflected waves can be generated in the high-frequency signal flowing in the contact. Thus, there is a problem that realization in the high-frequency band of the high-frequency signal flowing in the contact becomes difficult.

[0012] The present application was completed in view of such a situation, and aims to provide a coaxial connector capable of realizing realization of a high-frequency signal flowing in a contact in a high-frequency band.

[0013] Means for Solving the Problem

[0014] The present application studies the shape of the housing and the shape of the housing to make the difference in the distance from the contact between the base end portion side and the tip end portion side to the housing extremely small. Thus, a coaxial connector capable of suppressing mismatch of impedance is provided.

[0015] (1) A coaxial connector according to an embodiment of the present application is constituted at 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 jacket covering the outer conductor, wherein

[0016] The coaxial connector has:

[0017] A contact configured on the basis of a strip-shaped metal plate arranged in the axial direction of the coaxial cable, capable of connecting with a cylindrical counterpart contact, and having a setting surface on the proximal end portion side of the strip-shaped metal plate capable of contacting the center conductor, a pair of fixed terminals and an elastically deformable movable terminal erected from the distal end portion side of the strip-shaped metal plate capable of externally contacting the counterpart contact by three-point contact;

[0018] A housing composed of an insulating material, including a first connection base portion having a housing chamber opened on one face side capable of inserting the counterpart contact, and internally arranged with a pair of the fixed terminals and the movable terminal, and a second connection base portion partially protruding from the first connection base portion; and

[0019] A conductive housing having a cylindrical portion provided opened on the one face side and surrounding the first connection base portion, and a gutter-shaped extension portion connected to the cylindrical portion capable of internally housing the second connection base portion,

[0020] The extension portion of the housing includes a bottom sheet covering the opening of the cylindrical portion on the other face side of the housing in a manner of housing the first connection base portion in the cylindrical portion,

[0021] The bottom sheet has an inclined surface with one side higher covering the proximal end portion side of the strip-shaped metal plate and the other side lower covering the distal end portion side of the strip-shaped metal plate.

[0022] (2) The bottom sheet is configured to include the bottom surface of the housing, and the distance between the metal plate of the contact and the bottom surface of the housing separated by the insulating material of the housing is the same on the one side and the other side.

[0023] (3) The bottom sheet is configured to include the bottom surface of the housing, and the difference in the distance between the metal plate of the contact and the bottom surface of the housing separated by the insulating material of the housing is smaller on the one side and the other side.

[0024] (4) Preferably, a pair of the fixed terminals are located in one set of vertices of an imaginary equilateral triangle inscribed in the counterpart contact,

[0025] The movable terminal is located in another vertex of the imaginary equilateral triangle and is arranged in opposition to the intermediate portion of the pair of fixed terminals.

[0026] (5) Preferably, the contact is integrally formed with the housing,

[0027] The contact has at least:

[0028] The setting surface is formed by exposing the base end portion side of the metal plate on a prescribed surface of the second connection base portion.

[0029] The contact edge is exposed to the housing chamber in the pair of fixed terminals and is capable of contacting the counterpart contact.

[0030] (6) Preferably, the coaxial connector of the present application further has a press-fit housing having a groove cut into an outer periphery capable of pressing the center conductor, capable of being inserted from an opening side of the housing chamber toward a prescribed portion of the second connection base portion,

[0031] The extension portion of the housing includes:

[0032] A pair of first cylinders capable of pressing the press-fit housing against the second connection base portion; and

[0033] A pair of second cylinders capable of press-fitting the outer conductor.

[0034] Inventive Effects

[0035] The shape of the housing and the shape of the housing of the coaxial connector of the present application are adjusted so that the distance between the strip-shaped metal plate of the contact and the bottom surface of the housing, which are separated by the insulating material of the housing, is as much the same on the base end portion side and the tip end portion side of the contact. Thereby, the mismatch of impedance can be suppressed, and the improvement of the high frequency band of the high frequency signal flowing in the contact can be achieved. In addition, as a characteristic shape, the bottom plate piece of the housing has an inclined surface, and the tip end portion side of the housing is a tapered shape. Thereby, in addition to the functionality, the designability is also excellent. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The structure of the coaxial connector of the embodiment of the present application is an appearance view of the coaxial connector configured at the terminal end of the coaxial cable, as viewed from the upper surface side, with the counterpart coaxial connector disposed in opposition.

[0037] Figure 2 The structure of the coaxial connector of the embodiment of the present application is an appearance view of the coaxial connector configured at the terminal end of the coaxial cable, as viewed from the lower surface side.

[0038] Figure 3A 、 Figure 3B are each a drawing showing the structure of the coaxial connector of the embodiment, Figure 3A is a plan view showing the coaxial connector configured at the terminal end of the coaxial cable, Figure 3B is Figure 3A a right side view of

[0039] Figure 4 This refers to the structure of the coaxial connector in the described embodiment, along... Figure 3A A sectional view along the XX direction.

[0040] Figure 5 The structure of the coaxial connector described in the embodiment is shown as the state before the end of the coaxial cable is crimped. Figure 2 The corresponding appearance diagram.

[0041] Figure 6 This is a three-dimensional exploded assembly view showing the structure of the coaxial connector according to the described embodiment.

[0042] Figure 7 The structure of the housing of the coaxial connector described in the embodiment is shown in separate external views of the integrally molded contacts and the housing.

[0043] Figure 8A , Figure 8B These are figures illustrating the structure of the housing included in the coaxial connector of the described embodiment. Figure 8A It is a plan view showing the upper surface of the shell. Figure 8B It is a plan view showing the lower surface of the shell.

[0044] Figure 9 This refers to the structure of the coaxial connector in the described embodiment, along... Figure 4 A cross-sectional view along the AA direction.

[0045] Figure 10 This is an external view showing the structure of the press-fit housing of the coaxial connector of the described embodiment.

[0046] Figure 11A , Figure 11B These are front views illustrating the structure of the press-fit housing included in the coaxial connector of the described embodiment. Figure 11A This indicates the state before the press-fit housing is fully installed on the housing. Figure 11B This indicates that the press-fit housing has been fully installed onto the housing.

[0047] Figure 12 This is a graph showing the relationship between VSWR value and frequency in a prior art coaxial connector and a coaxial connector of an embodiment. The vertical axis of the graph represents the VSWR value, and the vertical axis of the graph represents the frequency.

[0048] Label Explanation

[0049] 1: Contact;

[0050] 3: Shell;

[0051] 5: Shell;

[0052] 7: Press-fitted shell;

[0053] 10: coaxial plug (coaxial connector);

[0054] 11s, 11s: pair of fixed terminals;

[0055] 11t: metal plate;

[0056] 12s: movable terminal;

[0057] 31: first connection base portion;

[0058] 31r: housing chamber;

[0059] 32: second connection base portion;

[0060] 51: cylindrical portion;

[0061] 52: extension portion;

[0062] Cb: coaxial cable;

[0063] Di: dielectric;

[0064] Wb: outer conductor;

[0065] Wc: center conductor;

[0066] Wi: insulating sheath. DETAILED DESCRIPTION

[0067] Hereinafter, a mode for carrying out the present application will be described with reference to the accompanying drawings.

[0068] [Structure of coaxial connector]

[0069] First, the structure of the coaxial connector of an embodiment of the present application will be described.

[0070] (Overall structure)

[0071] With reference to Figures 1 to 6 , the coaxial connector (hereinafter, referred to as coaxial plug) 10 of an embodiment of the present application is constituted at 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.

[0072] The coaxial plug 10 is provided with a contact 1 based on three-point contact, a housing 3 including first and second connection base portions, and a shell 5 of electric conductivity. In addition, the housing 3 has a block-shaped press-fit housing 7. Also, the shell 5 has a pair of first cylinders 521, 521 and a pair of second cylinders 522, 522.

[0073] The contact 1 is capable of electrically connecting the cylindrical center contact 2 which is the counterpart side contact and the center conductor Wc of the coaxial cable Cb (refer to Figure 1 ).

[0074] Referring to Figure 7 , the contact 1 has a strip-shaped metal plate 11t having a setting surface 321 at the base end portion side, and a pair of fixed terminals 11s, 11s and an elastically deformable movable terminal 12s at the tip end portion side of the metal plate 11t. The metal plate 11t is disposed along the axis of the coaxial cable Cb. In other words, the length direction of the metal plate 11t is 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 end portion side of the metal plate 11t. In other words, the portions of the metal plate which are bent in the substantially perpendicular direction from the plane of the metal plate 11t form the pair of fixed terminals 11s, 11s and the movable terminal 12s, respectively. The center contact 2 is capable of being inserted in the space surrounded by the pair of fixed terminals 11s, 11s and the movable terminal 12s (refer to Figure 1 ).

[0075] The pair of fixed terminals 11s, 11s are disposed in opposition in the direction substantially perpendicular to the length direction in which the metal plate 11t extends. The movable terminal 12s is disposed in a state of being in opposition to the intermediate portions of the pair of fixed terminals 11s, 11s. When the center contact 2 is inserted in 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 are capable of externally contacting the outer periphery of the center contact 2 by three-point contact.

[0076] Referring to Figures 2 to 6 , the contact 1 is integrally formed with the housing 3. The setting surface 321 of the contact 1 is exposed to a prescribed surface of the second connection base portion 32 to be described later. Here, the setting surface 321 is exposed to the connection surface 32c of the upper surface of the second connection base portion 32 which is lowered by one level, and is capable of contacting the center conductor Wc. The center conductor Wc is placed on the setting surface 321, and by the press-fit housing 7 which is pressed toward the housing 3, the center conductor Wc is capable of being reliably electrically connected to the contact 1.

[0077] Referring to Figures 6 to 8A , 8B, the housing 3 includes a first connection base portion 31 having a disc portion and a second connection base portion 32 having a combined rectangular portion. The second connection base portion 32 is in a form which partially protrudes from the disc portion of the first connection base portion 31. The first connection base portion 31 has a receiving chamber 31r (refer to Figure 2 or Fig. 3) at the center portion of the disc portion.

[0078] Referring to Figure 2 or Fig. 3 and Figure 5The housing 3 has a shape in which one face of the housing 3 is opened to allow the center contact 2 to be inserted. The housing 3 is formed in a substantially rectangular shape, and a pair of fixed terminals 11s, 11s and a movable terminal 12s are arranged inside the housing 3. The housing 3 has a pair of gaps 31g, 31g (see FIG. 6) that expand outward from the bottom area of the rectangular shape. Thus, the housing 3 has a shape similar to a plus (+) sign on the upper surface of the disc portion of the first connection base portion 31. This is one of the structures for maintaining flexibility in response to various environmental changes in the disc portion of the first connection base portion 31 or the housing 3. Figure 9

[0079] Referring to Figure 5 The housing 5 has a cylindrical portion 51 and an eave-shaped extension portion 52. The cylindrical portion 51 is configured to surround the disc portion of the first connection base portion 31. The cylindrical portion 51 can accommodate the first connection base portion 31 of the housing 3.

[0080] The cylindrical portion 51 can accommodate the external contact 6 (see FIG. 6) of the counterpart connector 20 described below inside the cylindrical portion 51. When the external contact 6 is inserted into the cylindrical portion 51, the housing 5 can be electrically connected to the external contact 6. In addition, the contact 1 can be electrically connected to the center contact 2. Figure 1

[0081] Referring to Figures 1 to 6 The extension portion 52 is configured to be connected to the cylindrical portion 51. The extension portion 52 has an eave-shaped structure connected to a portion of the outer periphery of the cylindrical portion 51 and extending away from the outer periphery of the cylindrical portion 51. In addition, the second connection base portion 32 (see FIG. 6) of the housing 3 can be accommodated inside the extension portion 52. In addition, the extension portion 52 functions to secure the coaxial cable Cb. Figure 2 Figure 5

[0082] More specifically, the extension portion 52 has a pair of first cylinders 521, 521 and a pair of second cylinders 522, 522. The pair of first cylinders 521, 521 can press the crimping housing 7 against the second connection base portion 32, and further can crimp the center conductor Wc of the coaxial cable Cb to the setting surface 321 of the contact 1. The pair of second cylinders 522, 522 can crimp the external conductor Wb from above the dielectric Di.

[0083] By crimping the external conductor Wb surrounding the dielectric Di by the pair of second cylinders 522, 522, the external conductor Wb can be electrically connected to the housing 5. Thus, the coaxial plug 10 can be secured to the terminal end of the coaxial cable Cb.

[0084] Referring to Figures 1 to 6 ​​​​The extension 52 also has a bottom plate piece 52b that covers the opening on the other side of the cylindrical portion 51 of the housing 3. That is, the first connection base portion 31 that constitutes the disc portion is in a state of being housed by the bottom plate piece 52b and the cylindrical portion 51.

[0085] Referring to Figure 4 The bottom plate piece 52b is an inclined surface, and the side of the extension 52 on which the first and second barrels (521, 522) are formed is higher, and the end portion of the coaxial connector 10 is lower. In other words, the bottom plate piece 52b has an inclined surface that is higher on the side of the base end portion side of the metal plate 11t (the side of the mounting surface 321), and is lower on the other side of the end portion side of the metal plate 11t (the side of the terminals 11s and 12s). Such an inclined surface of the bottom plate piece 52b can also be formed in accordance with the shapes of the first connection base portion 31 and the second connection base portion 32 of the housing 3. Here, on the other side of the housing 3, the second connection base portion 32 has a relatively high surface compared to the first connection base portion 31, and thus the bottom plate piece 52b that has the inclined surface described above is constituted.

[0086] (Structure of the counterpart connector)

[0087] Next, referring to Figure 1 The structure of the receptacle (counterpart connector) 20 of the coaxial plug 10 of the connection embodiment will be described. The receptacle 20 of the embodiment is surface-mounted to a printed board not shown. The receptacle 20 has a cylindrical center contact 2 that closes the end portion, a housing 4 made of a dielectric, and a ring-shaped outer contact 6.

[0088] The center contact 2 is associated with the main body portion 21 formed on a concentric circle thereof, and the lead terminal 2r of the center contact 2, and can be soldered and joined to a signal pattern in a wiring pattern of a printed board not shown. The outer contact 6 is associated with the main body portion 61 formed on a concentric circle of the main body portion 21 and having an open upper surface, and the lead terminal 6r of the outer contact 6, and can be soldered and joined to a ground pattern in a wiring pattern of a printed board not shown.

[0089] The housing 4 is formed in a rectangular plate shape. The center contact 2 and the outer contact 6 are integrally molded by the housing 4, and thus the center contact 2 and the outer contact 6 are fixed. Inside the housing 4, a dielectric substance is filled, and the center contact 2 and the outer contact 6 are electrically insulated.

[0090] When the coaxial plug 10 and the receptacle 20 are connected, the center conductor Wc present in the coaxial cable Cb can be connected to the center contact 2, and the outer conductor Wb present in the coaxial cable Cb can be connected to the outer contact 6. Thus, a high-frequency signal can be transmitted from the coaxial cable Cb to the printed board, and a high-frequency signal can be transmitted from the printed board to the coaxial cable Cb.

[0091] (Structure of contact)

[0092] Next, the structure of the contact 1 of the embodiment will be described with reference to Figure 7 and Figure 3A , Figure 8B The contact 1 can be obtained in a desired shape based on three-point contact by blanking and bending processing of a metal plate having electrical conductivity. The contact 1 is preferably composed of a copper alloy, but is not limited to a copper alloy.

[0093] One pair of fixed terminals 11s, 11s is located in one set of vertices of an imaginary equilateral triangle inscribed in the center contact 2. On the other hand, the movable terminal 12s is located in another vertex of the above-mentioned imaginary equilateral triangle. Further, the contact surface of the movable terminal 12s is disposed in a state of opposing the intermediate portions of the one pair of fixed terminals 11s, 11s. More specifically, the movable terminal 12s is disposed in a state of deforming elastically in a direction along a straight line passing through the vertex of the imaginary equilateral triangle where the movable terminal 12s is located and the intermediate portions of the one pair of fixed terminals 11s, 11s.

[0094] When the center contact 2 of the socket 20 is inserted into the accommodation chamber 31r of the first connection base portion 31, the outer periphery of the center contact 2 contacts the ridge portions (contact rims) of the one pair of fixed terminals 11s, 11s in the accommodation chamber 31r and contacts the movable terminal 12s. In this way, the contact 1 can achieve three-point contact with the center contact 2.

[0095] (Structure of housing)

[0096] Next, the structure of the housing 3 of the embodiment will be described with reference to Figures 2 to 8A , 8B. The housing 3 is preferably composed of a synthetic resin having insulating properties, and the synthetic resin having insulating properties can be molded to obtain the housing 3 in a desired shape.

[0097] With reference to Figure 4 , in the coaxial plug 10, the distance from the contact 1 (metal plate 11t) to the bottom surface of the shell 5 is substantially the same on the tip end portion side and the base end portion side of the contact 1. In order to facilitate such a feature, the bottom plate piece 52b of the cylindrical portion 51 has the inclined surface as described above.

[0098] More specifically, the difference between the distance D2 between the tip end portion side of the contact 1 and the bottom surface of the shell 5 and the distance Dl between the base end portion side of the contact 1 and the bottom surface of the shell 5 is made extremely small. The wall thickness of the housing 3 is substantially the same on the tip end portion and the base end portion of the contact 1. That is, D2 ≈ Dl.

[0099] On the tip end side and the base end side of the contact 1, regarding the distance between the contact 1 (the metal plate 11t) and the shell 5, by setting the difference between the tip end side and the base end side of the contact 1 to be small, the disorder 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 be less than "1.5" up to 60 GHz (refer to Figure 12 ).

[0100] (Structure of the shell)

[0101] Next, the structure of the shell 5 of the embodiment will be described with reference to Figures 1 to 6 The shell 5 is preferably obtained by performing a molding process on a spread plate of a metal plate or the like processed into a prescribed outer shape to obtain the shell 5 of the desired shape. The shell 5 is preferably molded on the cylindrical portion 51 and the gutter-shaped extension portion 52.

[0102] It is preferable to bend and mold the pair of first cylinders 521, 521 and the pair of second cylinders 522, 522 into a spread state at the extension portion 52. In addition, it is preferable to mold the bottom plate piece 52b of the cylindrical portion 51 at the extension portion 52.

[0103] The pair of first cylinders 521, 521 can be bend-processed to surround the press-fit shell 7 mounted to the second connection base portion 32. By the pressing of the pair of first cylinders 521, 521 on the press-fit shell, the center conductor Wc placed on the setting surface 321 of the second connection base portion 32 can be firmly press-bonded to the setting surface 321.

[0104] The pair of second cylinders 522, 522 can be bend-processed to surround the outer conductor Wb around the periphery of the dielectric Di. Thereby, the pair of second cylinders 522, 522 press-bond the outer conductor Wb, electrically connect the outer conductor Wb and the shell 5, and fix the coaxial connector 10 to the terminal of the coaxial cable Cb.

[0105] (Structure of the press-fit shell)

[0106] Next, the structure of the press-fit shell 7 of the embodiment will be described with reference to Figure 6 , Figure 9 , Figure 10 and Figure 11A , 11B The press-fit shell 7 has a groove 7s cut into a U shape. The groove 7s is formed to be able to press the outer periphery of the center conductor Wc. The press-fit shell 7 can be inserted from the opening side of the housing chamber 31r toward a prescribed portion of the second connection base portion 32. The prescribed portion has a structure for holding the press-fit shell 7 to the second connection base portion 32, for example.

[0107] A pair of lance members 7r, 7r is provided at one end of the press-fit housing 7. The pair of lance members 7r, 7r is disposed across the groove 7s. A pair of guide grooves 7g, 7g is provided between the pair of lance members 7r, 7r and the groove 7s. A pair of notches 7n, 7n is provided between the guide grooves 7g, 7g and the lance members 7r, 7r. Thus, the periphery of the lance members 7r, 7r is allowed to deform with elasticity.

[0108] On the other hand, referring to Figure 6 or Figure 7 A pair of steps 32d, 32d capable of engaging the pair of lance members 7r, 7r of the press-fit housing 7 is formed in the second connecting base portion 32 of the housing 3. In addition, a pair of protruding portions 32e, 32e that protrude obliquely from the base end of the steps 32d, 32d is formed inside the pair of steps 32d, 32d. A pair of convex portions 32p, 32p for positioning is formed between the pair of steps 32d, 32d and the protruding portions 32e, 32e and the connecting surface 32c. When the press-fit housing 7 is pressed into the second connecting base portion 32 via fitting between the guide grooves 7g, 7g and the convex portions 32p, 32p, the lance members 7r, 7r are engaged with the steps 32d, 32d. Thus, the press-fit housing 7 is held to the second connecting base portion 32.

[0109] Referring to Figure 11A , a state in which the center conductor Wc is placed on the placement surface 321 and the press-fit housing 7 is held to the second connecting base portion 32 is shown. In this state, the groove 7s of the press-fit housing 7 does not pressurize the center conductor Wc. Next, referring to Figure 11B , the pair of first barrels 521, 521 is bent to surround the press-fit housing 7. Thus, the center conductor Wc on the placement surface 321 is pressurized by the groove 7s, and the center conductor Wc is crimped to the placement surface 321. At this time, the pair of lance members 7r, 7r of the press-fit housing 7 moves from the pair of steps 32d, 32d to the planar regions of the protruding portions 32e, 32e. Thus, the press-fit housing 7 is firmly positioned by fitting between the guide grooves 7g, 7g and the convex portions 32p, 32p of the second connecting base portion 32, through deformation of the periphery of the lance members 7r, 7r by the pair of notches 7n, 7n. Thus, the center conductor Wc can be connected to the contact 1.

[0110] The coaxial plug 10 of the embodiment presses and crimps the center conductor Wc to the placement surface 321 using the press-fit housing 7 and the pair of first barrels 521, 521 that pressurize the press-fit housing 7. Thus, the center conductor Wc is reliably connected to the contact 1.

[0111] [Effects of the Coaxial Connector]

[0112] Next, the effects of the coaxial connector 10 of the embodiment will be described.

[0113] With reference to Figure 4 , the coaxial plug 10 of the embodiment is configured such that the difference between the distances between the tip end portion and the base end portion of the contact 1 and the shell 5 is small, and thus, the disturbance of the impedance can be suppressed. Thus, the high frequency band of the high frequency signal transmitted to the coaxial plug 10 can be increased. In other words, the distance between the metal plate 11t of the contact 1 and the bottom surface of the shell 5, which is separated by the insulating material of the housing 3, is configured to be extremely small at the tip end portion and the base end portion of the contact 1. Alternatively, the distance between the metal plate 11t of the contact 1 and the bottom surface of the shell 5, which is separated by the insulating material of the housing 3, is configured to be the same at the tip end portion and the base end portion of the contact 1.

[0114] With reference to Figure 12 As is apparent from the above, in the case of the prior art (for example, Patent Document 1) in which the difference between the distances between the base end portion and the tip end portion of the contact and the shell is large, the characteristic curve a of the VSWR, for example, sharply rises to the 15 GHz band, and the connector of the prior art can be used only up to the 6 GHz band. On the other hand, the connector 10 of the embodiment is configured such that the difference between the distances between the base end portion and the tip end portion of the contact 1 and the shell 5 is small (see Figure 4 ), and thus, the characteristic curve β of the VSWR does not exceed "1.5" up to the 60 GHz band. Thus, it is apparent that the connector 10 of the embodiment can be used up to the 60 GHz band.

[0115] With reference to Figures 1 to 9 The coaxial plug 10 of the embodiment has a three-point contact type contact 1 that is externally tangent to the center contact 2 by three-point contact. The three-point contact type contact 1 is configured by a pair of fixed terminals located in one set of vertices of the imaginary equilateral triangle internally tangent to the center contact 2, and an elastic displacement movable terminal located in the other vertex. The elastic displacement of the movable terminal is mainly within the range of the direction toward the middle portion of the pair of fixed terminals and the opposite direction thereof. Thus, compared with the coaxial connector using a two-point contact type contact that needs to be expanded in the direction in which the terminals are separated from each other, miniaturization can be achieved.

[0116] With reference to Figure 11A , 11B From the state in which the center conductor Wc is placed on the placement surface 321 and the press-fit housing 7 is held to the second connection base portion 32, the center conductor Wc is press-fitted to the placement surface 321 by means of the pair of first cylinders 521, 521 and the press-fit housing 7. In other words, the bottom portion of the groove 7s presses the outer periphery of the center conductor Wc that opposes the placement surface 321, and thus, the center conductor Wc can be connected to the contact 1.

Claims

1. A coaxial connector configured at 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 jacket covering the outer conductor, wherein the coaxial connector has: a contact configured on the basis of a strip-shaped metal plate arranged in an axial direction of the coaxial cable, capable of connecting with a cylindrical counterpart contact, and having a setting surface of a base end portion side of the strip-shaped metal plate capable of contacting with the center conductor, a pair of fixed terminals and an elastically deformable movable terminal capable of contacting with the counterpart contact by three-point contact, the pair of fixed terminals being formed in a quadrangular rod shape by bending end portions of the metal plate in a manner of being arranged in opposition in a direction perpendicular to an extending direction of the metal plate, and having a ridge portion contacting with the counterpart contact, the movable terminal being arranged in a state of being in opposition to an intermediate portion of the pair of fixed terminals, capable of elastically deforming toward the intermediate portion; a housing configured of an insulating material, including a first connection base portion having a housing chamber opened at one face side capable of inserting the counterpart contact, and the housing chamber having the pair of fixed terminals and the movable terminal arranged inside, and a second connection base portion of which a part protrudes from the first connection base portion; and a conductive shell having a cylindrical portion provided to be opened at the one face side and surrounding the first connection base portion, and a gutter-shaped extending portion connected to the cylindrical portion capable of housing the second connection base portion inside, the extending portion of the shell including a floor sheet covering an opening of the cylindrical portion at the other face side of the housing in a manner of housing the first connection base portion in the cylindrical portion, the floor sheet having an inclined surface of one side higher covering a base end portion side of the strip-shaped metal plate and the other side lower covering an end portion side of the strip-shaped metal plate, the inclined surface being formed in accordance with shapes of the first connection base portion and the second connection base portion of the housing.

2. The coaxial connector according to claim 1, wherein the floor sheet is configured to include a bottom surface of the shell, and a distance between the metal plate of the contact and the bottom surface of the shell separated by the insulating material of the housing is the same at the one side and the other side.

3. The coaxial connector according to claim 1, wherein the floor sheet is configured to include a bottom surface of the shell, and a difference in a distance between the metal plate of the contact and the bottom surface of the shell separated by the insulating material of the housing is smaller at the one side and the other side.

4. The coaxial connector according to any one of claims 1 to 3, wherein the pair of fixed terminals are located in a group of apexes of an imaginary equilateral triangle inscribed in the counterpart contact. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The movable terminal is located at another vertex of the imaginary equilateral triangle and is arranged so as to face the intermediate portion of the pair of fixed terminals.

5. The coaxial connector according to any one of claims 1 to 3, wherein the contact is integrally formed with the housing, the contact has at least: a contact surface capable of contacting the center conductor, with a base end portion of the metal plate exposed on an upper surface of the second connection base portion; and a contact rim exposed to the receiving chamber from among the pair of fixed terminals and capable of contacting the counterpart contact.

6. The coaxial connector according to claim 5, wherein the coaxial connector further includes a crimping housing having a groove cut so as to be capable of pressing an outer periphery of the center conductor, capable of being inserted from an opening side of the receiving chamber toward a prescribed portion of the second connection base portion, the extension portion of the housing includes: a pair of first cylinders capable of pressing the crimping housing against the second connection base portion; and a pair of second cylinders capable of crimping the outer conductor. ​

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