CN107959146B

CN107959146B - Coaxial connector

Info

Publication number: CN107959146B
Application number: CN201710934086.9A
Authority: CN
Inventors: 吉村正雄
Original assignee: JST Mfg Co Ltd
Current assignee: JST Mfg Co Ltd
Priority date: 2016-10-14
Filing date: 2017-10-10
Publication date: 2020-08-18
Anticipated expiration: 2037-10-10
Also published as: JP2018063892A; TWI669867B; CN107959146A; TW201820726A

Abstract

A coaxial connector (10) is provided with a housing (1) and a curved tubular shell (2). A coaxial connector is provided with a center contact (3) and a set of disc-shaped dielectrics (4a, 4 b). The housing has a receiving chamber (11) on one end, into which a coaxial plug (20) can be inserted. The curved tube-shaped case is fixed inside the housing substantially parallel to one surface (91p) of the printed circuit board (9p), and is bent axially on the other end side of the housing so as to face the one surface of the printed circuit board. The center contact is disposed inside the curved tubular shell coaxially with the curved tubular shell along an axial center of the curved tubular shell. A set of disc-shaped dielectrics is housed inside the curved tubular shell, supporting the center contact at the center. A pair of disc-shaped dielectrics (4a, 4b) are arranged in the curved tubular shell so As to be separated in the axial direction of the center contact, and an air layer (As) having a small dielectric constant is provided between the pair of disc-shaped dielectrics. Thus, a miniaturized coaxial connector is provided.

Description

Coaxial connector

Technical Field

The present invention relates to a coaxial connector. In particular, to the following coaxial connector structure: the coaxial connector is attachable to and detachable from a printed circuit board, and is configured to be attachable to and detachable from a counterpart coaxial connector at a distal end of a coaxial cable.

Background

In general, a printed circuit board is disposed inside an ETC (Electronic Toll Collection System) in-vehicle device or the like. A circular coaxial connector, for example, is mounted on the printed circuit board. The coaxial connector is detachably connected to a counterpart coaxial connector formed at one end of the coaxial cable. An antenna is connected to the other end of the coaxial cable. Further, by connecting the coaxial connector on the other side to the coaxial connector, it is possible to receive a high-frequency signal from the antenna to the printed circuit board or to transmit a high-frequency signal from the printed circuit board to the antenna.

Generally, a circular counterpart coaxial connector, in which a coaxial cable extends in the outer circumferential direction, is connected to such a circular coaxial connector. The circular coaxial connector is a vertical mounting type connector in which a mating coaxial connector is detachable from a surface of the printed circuit board in a vertical direction, a so-called top-end insertion type coaxial connector.

On the other hand, a horizontal-mount type connector, a so-called side-insertion type coaxial connector, in which a rectangular mating-side coaxial connector fixed in the axial direction of a coaxial cable is detachable from one surface of a printed circuit board in the horizontal direction, has also been developed.

In such a side-insertion type coaxial connector, a coaxial connector has been conventionally developed in which the periphery of an L-shaped center contact is integrated by an L-shaped dielectric material, and the L-shaped dielectric material is sandwiched from the outer circumferential direction by a pair of L-shaped cylindrical split shells (see, for example, patent document 1).

In addition, in such a side-insertion type coaxial connector, a coaxial connector has been conventionally developed in which an L-shaped center contact is mounted in the center of an L-shaped dielectric material, and the L-shaped dielectric material is sandwiched from the outer circumferential direction by a pair of flanged L-shaped cylindrical split shells (for example, see patent document 2).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2002-270311

Patent document 2: specification of U.S. Pat. No. 5116245

In the coaxial connector disclosed in

patent document

1 or 2, an L-shaped center contact formed of a conductive small-diameter rod-shaped member is continuously covered from its middle portion to its terminal portion with an L-shaped dielectric material having a dielectric constant larger than that of air. In such a structure, there is a problem that: it is difficult to transmit high frequency signals using a small coaxial connector. It is considered that a higher frequency signal is required to be transmitted by a smaller coaxial connector in the future. Further, it can be said that the above is an object of the present invention.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object thereof is to provide a more compact coaxial connector by interposing an air layer between a center contact surrounded by a curved cylindrical curved tubular shell.

Means for solving the problems

The present inventors have considered that, with respect to a curved tubular shell provided inside a housing provided on a printed circuit board, a pair of disc-shaped dielectrics is arranged so as to be separated in the axial direction of the shell, the pair of disc-shaped dielectrics is accommodated inside the shell, and a center contact is supported at the center portion, whereby an air layer can be interposed between the center contact surrounded by the curved tubular shell.

(1) A coaxial connector according to the present invention is a coaxial connector that can be mounted on one surface of a printed circuit board and that can be detachably connected to a mating coaxial connector that is formed at a terminal end of a coaxial cable, the coaxial connector including: a rectangular parallelepiped housing having a housing chamber on one end side, one surface of the housing chamber being open, and the mating coaxial connector being insertable therein; a cylindrical tubular curved tubular case fixed substantially parallel to one surface of the printed circuit board inside the case and bent axially on the other end side of the case so as to face the one surface of the printed circuit board; a center contact disposed inside the curved tubular shell coaxially with the shell along a center of an axis of the shell; and a set of disc-shaped dielectrics which is accommodated inside the curved tubular shell and supports the center contact at a central portion, the curved tubular shell being provided with the set of disc-shaped dielectrics separately in an axial direction of the center contact, an air layer being provided between the set of disc-shaped dielectrics.

(2) Preferably, the center contact is integrally molded with a set of the disc-shaped dielectrics, and the curved tubular shell is constituted by a set of half-cylindrical divided shells surrounding the set of the disc-shaped dielectrics from an outer circumferential direction.

(3) Preferably, the curved tubular shell is configured by joining end edges of outer peripheries of a set of the split shells to each other by laser welding.

(4) Preferably, a latch groove capable of latching a lock lever provided in the mating coaxial connector is formed in an inner wall of the housing chamber of the housing.

(5) Preferably, the housing further includes a pair of reinforcing tabs fixed to both side surfaces of the housing and having a bottom surface soldered to one surface of the printed circuit board.

Effects of the invention

Since the coaxial connector of the present invention includes the curved tubular shell in which the pair of disc-shaped dielectrics are arranged so as to be separated from each other in the axial direction of the center contact and the air layer is provided between the pair of disc-shaped dielectrics, the outer diameter of the shell can be reduced and the coaxial connector can be downsized.

Drawings

Fig. 1 is a perspective view showing a structure of a coaxial connector according to an embodiment of the present invention, and shows a state in which the coaxial connector is mounted on one surface of a printed circuit board.

Fig. 2 is a perspective view showing the structure of the coaxial connector according to the embodiment, and shows an appearance of the coaxial connector as viewed from the side opposite to fig. 1 in a state where the coaxial connector is mounted on one surface of the printed circuit board.

Fig. 3 is an exploded perspective assembly view showing the structure of the coaxial connector of the embodiment.

Fig. 4A is a plan view showing a structure of a housing provided in the coaxial connector of the above embodiment.

Fig. 4B is a front view showing a structure of a housing provided in the coaxial connector of the embodiment.

Fig. 4C is a rear view showing the structure of the housing provided in the coaxial connector of the embodiment.

Fig. 5A is a structure of a housing provided in the coaxial connector of the embodiment, and is a perspective view showing an appearance of a back surface, an upper surface, and a left side surface.

Fig. 5B is a structure of a housing provided in the coaxial connector of the embodiment, and is a perspective view showing an appearance of a back surface, a lower surface, and a right side surface.

Fig. 5C is a perspective view showing the outer appearance of the rear surface and the right side surface of the housing of the coaxial connector according to the embodiment.

Fig. 6 is an enlarged perspective view of a main part of the coaxial connector according to the embodiment, and shows a state before a center contact with a set of disc-shaped dielectrics is surrounded by a set of split shells.

Fig. 7 is a front view showing the structure of the center contact provided in the coaxial connector according to the above embodiment, and shows a state of being integrally molded with a set of disc-shaped dielectrics.

Fig. 8 is a perspective view showing a structure of a center contact provided in the coaxial connector according to the embodiment.

Fig. 9A is a longitudinal sectional view showing the structure of the coaxial connector according to the embodiment, and shows a state before the coaxial connector on the mating side is connected.

Fig. 9B is a longitudinal sectional view showing the structure of the coaxial connector according to the embodiment, and shows a state in which the counterpart coaxial connector is connected.

Fig. 10 is a perspective view showing the structure of the coaxial connector of the embodiment, and shows a state in which the counterpart coaxial connector is connected in a vertical section.

Description of the reference symbols

1 outer cover

2 curved tubular shell

3 center contact

4a, 4b set of disc-shaped dielectrics

9p printed circuit board

10 coaxial connector

11 accommodation chamber

20 coaxial plug (opposite side coaxial connector)

One surface of 91p printed substrate

As air layer

Cb coaxial cable

Detailed Description

The following describes a mode for carrying out the present invention with reference to the drawings.

[ Structure of coaxial connector ]

First, a structure of a coaxial connector according to an embodiment of the present invention will be described.

Fig. 1 is a perspective view showing a structure of a coaxial connector according to an embodiment of the present invention, and shows a state in which the coaxial connector is mounted on one surface of a printed circuit board. Fig. 2 is a perspective view showing the structure of the coaxial connector according to the embodiment, and shows an appearance of the coaxial connector as viewed from the side opposite to fig. 1 in a state where the coaxial connector is mounted on one surface of the printed circuit board.

Fig. 3 is an exploded perspective assembly view showing the structure of the coaxial connector of the embodiment. Fig. 4A to 4C are diagrams showing a structure of a housing provided in the coaxial connector according to the embodiment, fig. 4A is a plan view of the housing, fig. 4B is a front view of the housing, and fig. 4C is a rear view of the housing.

Fig. 5A to 5C are configurations of a housing provided in the coaxial connector of the embodiment, fig. 5A is a perspective view showing an appearance of a back surface, an upper surface, and a left side surface of the housing, fig. 5B is a perspective view showing an appearance of a back surface, a lower surface, and a right side surface of the housing, and fig. 5C is a perspective view showing an appearance of a back surface and a right side surface of the housing.

Fig. 6 is an enlarged perspective view of a main part of the coaxial connector according to the embodiment, and shows a state before a center contact with a set of disc-shaped dielectrics is surrounded by a set of split shells. Fig. 7 is a front view showing the structure of the center contact provided in the coaxial connector according to the above embodiment, and shows a state of being integrally molded with a set of disc-shaped dielectrics.

Fig. 8 is a perspective view showing a structure of a center contact provided in the coaxial connector according to the embodiment. Fig. 9A and 9B are longitudinal sectional views showing the structure of the coaxial connector according to the embodiment, fig. 9A shows a state before the mating coaxial connector is connected, and fig. 9B shows a state before the mating coaxial connector is connected.

(Overall Structure)

Referring to fig. 1 to 10, a coaxial connector 10 according to an embodiment of the present invention is attachable to one surface 91p of a printed circuit board 9p, and is detachably connectable to a mating coaxial connector (hereinafter, referred to as a coaxial plug) 20 formed at an end of a coaxial cable Cb.

Referring to fig. 1 to 10, a coaxial connector 10 includes a rectangular parallelepiped housing 1 and a metal curved tubular housing 2. The coaxial connector 10 includes a rod-shaped center contact 3 and a pair of disc-shaped

dielectrics

4a and 4 b.

Referring to fig. 2 or fig. 5A to 5C and 9A, the housing 1 has a housing chamber 11 on one end side. The housing chamber 11 is opened in a rectangular shape on one surface of the housing 1, and the coaxial plug 20 can be inserted into the housing chamber 11 (see fig. 9A and 9B).

Referring to fig. 1 or 3 and fig. 9A, 9B or 10, the curved tubular shell 2 has the following structure: the housing 1 is fixed inside substantially parallel to the first surface 91p of the printed circuit board 9p, and is bent axially on the other end side of the housing 1 so as to face the first surface 91p of the printed circuit board 9 p. More specifically, one end portion side of the curved tubular case 2 is disposed in the housing chamber 11 of the housing 1, the intermediate portion of the curved tubular case 2 is fixed through the partition wall 12w of the housing 1, and the other end portion side of the curved tubular case 2 is configured to: on the other end side of the housing 1, the curved tubular case 2 is bent in the axial direction to face the one surface 91p of the printed circuit board 9 p. In the embodiment, the curved tubular shell 2 is formed of a pair of half-cylindrical divided

shells

2a, 2b (see fig. 6).

Referring to fig. 6 or fig. 9A, 9B, and 10, the center contact 3 is disposed inside the curved tubular shell 2. The center contact 3 is disposed coaxially with the curved tubular case 2 along the axial center of the curved tubular case 2.

Referring to fig. 6 or 7, a set of disc-shaped

dielectrics

4a, 4b is accommodated inside the curved tubular shell 2. A set of disc-shaped

dielectrics

4a, 4b supports the center contact 3 at each center portion. The disc-shaped dielectric 4a is disposed on the base end portion side of the contact terminal 31, and the disc-shaped dielectric 4b is disposed such that: the terminal is partially supported by a base end portion side of a DIP (dual in-line package) terminal 32 which can be soldered to a printed board 9p (see fig. 1, 9A, and 9B), more specifically, a bent portion 3cv of the center contact 3. The disc-shaped dielectric 4a has a thickness larger than that of the disc-shaped dielectric 4 b. The arrangement and thickness of the disk-shaped

dielectrics

4a and 4b may be in other arrangements and other thickness relationships as necessary. In an embodiment, the center contact 3 is integrally molded with a set of disc-shaped

dielectrics

4a, 4 b.

Referring to fig. 6 or fig. 9A, 9B, and 10, the curved tubular shell 2 is provided with a set of disc-shaped dielectrics 4a, 4B separately in the axial direction of the center contact 3. Thereby, an air layer As is provided between the pair of disc-shaped

dielectrics

4a, 4b of the curved tubular shell 2.

Since the coaxial connector 10 of the embodiment includes the curved tubular shell 2, the pair of disc-shaped

dielectrics

4a and 4b are arranged in the curved tubular shell 2 so As to be separated from each other in the axial direction of the center contact 3, and the air layer As is provided between the pair of disc-shaped

dielectrics

4a and 4b, the outer diameter of the shell can be reduced, and the coaxial connector can be downsized.

(Structure of housing)

Next, the structure of the housing 1 of the embodiment will be explained. Referring to fig. 1 to 5A to 5C, the housing 1 is preferably made of an insulator, and a synthetic resin having an insulating property can be molded to obtain a rectangular parallelepiped housing 1.

Referring to fig. 1 to 5A to 5C, the housing 1 has a recess 12 continuous with the other surface and the bottom surface on the opposite side of the housing chamber 11. The curved tubular shell 2 can be accommodated in the recess 12. The housing 1 further includes a partition wall 12w (see fig. 4B or 5C) that partitions the housing chamber 11 and the recess 12. The pressure inlet hole 12h opens to the partition wall 12w (see fig. 4C or 5C).

Referring to fig. 4C or 5C, the curved tubular shell 2 can be press-fitted into the press-fitting hole 12h from the recess 12 toward the housing chamber 11 (see fig. 9A). Thereby, the curved tubular case 2 can be fixed to the housing 1.

Referring to fig. 4C or 5C, in the housing 1, a pair of

projections

111, 111 are formed from the inner wall of the accommodation chamber 11. The pair of

projections

111 and 111 can be fitted into a square groove (not shown) provided in the housing 21 constituting the coaxial plug 20 to guide the insertion of the coaxial plug 20 (see fig. 9A and 9B). The pair of

projections

111, 111 function as keys for preventing the coaxial plug 20 from being erroneously inserted.

Referring to fig. 9B or 10, a latch groove 11r is formed in the inner wall of the housing chamber 11 of the housing 1. The lock lever 21r provided in the coaxial plug 20 can be locked in the latch groove 11 r.

Referring to fig. 1 to 3, the housing 1 further includes a pair of rectangular reinforcing

flanges

5 and 5. Referring to fig. 4A, a pair of

rectangular grooves

11d, 11d facing each other are formed on both side surfaces of the housing 1. The pair of reinforcing

flanges

5, 5 can be fixed to both side surfaces of the housing 1 by press-fitting the reinforcing flanges 5 into the pair of

rectangular grooves

11d, 11 d. The bottom surface of the reinforcing paddle 5 is soldered to the one surface 91p of the printed board 9p, whereby the housing 1 can be fixed to the printed board 9p (see fig. 1 or 2).

(Structure of curved tubular case and divided case)

Next, the structure of the curved tubular case 2 and the pair of

split cases

2a and 2b of the embodiment will be described. Referring to fig. 6, the

split cases

2a and 2b are preferably made of a conductive metal body, and a pair of half-

cylindrical split cases

2a and 2b can be obtained by molding the conductive metal body.

Referring to fig. 6, the assembly of the curved tubular shell 2 is preferably such that the center contact 3 with one set of disc-shaped

dielectrics

4a, 4b is surrounded by the other divided shell 2b in a state where the center contact 3 with one set of disc-shaped

dielectrics

4a, 4b is accommodated in the one divided shell 2 a. The outer peripheral edges of the pair of

split cases

2a and 2b are joined to each other by laser welding, whereby a cylindrical curved tubular case 2 without a gap can be obtained. Further, it is easy to transmit a high-frequency signal to the center contact 3. The contact terminal 31 is disposed at the center of the opening of one end of the curved tubular case 2, and the DIP terminal 32 is disposed at the center of the opening of the other end of the curved tubular case 2.

Referring to fig. 9A, 9B, or 10, the other end (edge) of the curved-tube-shaped case 2 is preferably soldered to the one surface 91p of the printed circuit board 9p, and the curved-tube-shaped case 2 can be electrically connected to a ground pattern (not shown) formed on the printed circuit board 9 p.

(Structure of center contact)

Next, the structure of the center contact 3 of the embodiment will be described. Referring to fig. 6 to 8, the center contact 3 is preferably formed of a conductive metal rod, and the conductive metal rod is bent to obtain the center contact 3 having the other end bent with respect to the one end. Preferably, the center contact 3 is composed of a copper alloy, but is not limited to a copper alloy.

Referring to fig. 6 to 8, the center contact 3 has a contact terminal 31 at one end and a DIP terminal 32 at the other end. The contact terminal 31 can be connected to the center contact 23 disposed in the coaxial plug 20 (see fig. 9A, 9B, or 10).

Referring to fig. 9A, 9B, or 10, the DIP terminal 32 is connected to a through hole Ht formed in the printed substrate 9 p. The DIP terminal 32 may be mounted on the printed circuit board 9p through the through hole, but may be surface-mounted together with the other end of the curved tubular case 2 after being inserted into the through hole Ht.

(construction of the coaxial connector on the other side)

Next, the structure of the coaxial plug 20 of the embodiment will be described. Referring to fig. 9A, 9B, or 10, the coaxial plug 20 is formed at the end of the coaxial cable Cb. The coaxial cable Cb is constituted by: a circular central conductor Wc composed of a single wire or a twisted wire; a dielectric Di such as a fluororesin surrounding the center conductor Wc; an outer conductor Wb such as a braided wire surrounding the dielectric Di; and an insulating sheath Wi that covers and protects the outer conductor Wb.

Referring to fig. 9A, 9B, or 10, the coaxial plug 20 includes a rectangular parallelepiped housing 21 and a metal cylindrical housing 22. The coaxial plug 20 includes a center contact 23 and a pair of disc-shaped

dielectrics

24a and 24 b.

Referring to fig. 9A, 9B, or 10, the middle of the case 22 is supported by the housing 21. One end portion of the shell 22 is connected to the outer conductor Wb. The other end of the housing 22 can be connected to the housing 2. One end portion of the center contact 23 is wired to the center conductor Wc. The other end of the center contact 23 can be connected to the center contact 3. A set of

dielectrics

24a, 24b is arranged inside the shell 22 in such a way that the central contact 23 is coaxial with the shell 22.

[ Effect of coaxial connector ]

Next, the operation and effect of the coaxial connector 10 according to the embodiment will be described. Referring to fig. 1 to 10, since the coaxial connector 10 includes the curved tubular shell 2 in which the pair of disc-shaped

dielectrics

4a and 4b are arranged so As to be separated from each other in the axial direction of the center contact 3 and the air layer As is provided between the pair of disc-shaped

dielectrics

4a and 4b, the outer diameter of the shell can be reduced and the coaxial connector can be downsized.

Further, referring to fig. 9A, 9B, or 10, since the other end portion (edge portion) of the housing 2 is soldered to the one surface 91p of the printed circuit board 9p, the coaxial connector 10 according to the embodiment can suppress impedance mismatch at the terminal portion.

Further, referring to fig. 6 or fig. 9A, 9B, and 10, the outer peripheral end edges of the pair of split cases 2a and 2B are joined to each other by laser welding, whereby the curved tubular case 2 without a gap can be obtained. And, it is easy to transmit a high frequency signal to the center contact 3.

Claims

1. A coaxial connector which can be mounted on one surface of a printed circuit board and to which a mating coaxial connector formed at a terminal end of a coaxial cable can be detachably connected,

the coaxial connector includes:

a rectangular parallelepiped housing having a housing chamber on one end side, one surface of the housing chamber being open, and the mating coaxial connector being insertable therein;

a cylindrical tubular curved tubular case fixed substantially parallel to one surface of the printed circuit board inside the case and bent axially on the other end side of the case so as to face the one surface of the printed circuit board;

a center contact disposed inside the curved tubular shell coaxially with the shell along a center of an axis of the shell; and

a set of disc-shaped dielectrics housed inside the curved tubular shell and supporting the center contact at a central portion,

the curved tubular shell is provided with a set of the disc-shaped dielectrics separately in an axial direction of the center contact, an air layer is provided between the set of the disc-shaped dielectrics,

one of the disc-shaped dielectrics is configured to be locally supported at a bent portion of the center contact that is bent in an axial direction of the curved tubular shell,

the other of the disc-shaped dielectrics is arranged to support a straight portion of the center contact on a base end portion side of a contact terminal connected to the counterpart-side coaxial connector in the housing chamber of the housing,

the disc-shaped dielectric at the straight portion has a thickness larger than that at the curved portion, and the air layer is provided between the disc-shaped dielectric at the straight portion and the disc-shaped dielectric at the curved portion.

2. The coaxial connector of claim 1,

the center contact is integrally molded with a set of the disc-shaped dielectrics,

the curved tubular shell is formed of a pair of half-cylindrical divided shells surrounding a pair of the disc-shaped dielectrics from the outer circumferential direction.

3. The coaxial connector of claim 2,

the curved tubular shell is configured by joining end edges of outer peripheries of a set of the split shells to each other by laser welding.

4. The coaxial connector of any one of claims 1-3,

a latch groove capable of latching a lock lever provided in the mating coaxial connector is formed in an inner wall of the housing chamber of the housing.

5. The coaxial connector of any one of claims 1-3,

the housing further includes a pair of reinforcing flanges fixed to both side surfaces of the housing and having a bottom surface soldered to one surface of the printed circuit board.

6. The coaxial connector of claim 4,