CN107959199B

CN107959199B - Mounting structure of coaxial connector

Info

Publication number: CN107959199B
Application number: CN201710946854.2A
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: 2017-10-12
Publication date: 2020-08-18
Anticipated expiration: 2037-10-12
Also published as: CN107959199A; TW201814985A; TWI648929B; JP6853998B2; JP2018063894A

Abstract

The invention provides a mounting structure of a coaxial connector, which is easy to match the impedance of the coaxial connector and a printed substrate. A coaxial connector (10) is provided with a housing (1) and a curved tubular shell (2), and a center contact (3) and a set of disc-shaped dielectrics (4a, 4b) are provided inside the curved tubular shell. The housing has a housing chamber (11) into which a coaxial plug (80) can be inserted. The curved tube-shaped case is fixed inside the case substantially in parallel with the printed circuit board (9p), and is bent in the axial direction on the end portion side of the case so as to reach one surface (91p) of the printed circuit board. The center contact is disposed coaxially with the curved tubular shell. A pair of disc-shaped dielectrics (4a, 4b) is disposed apart from each other in the axial direction of the center contact, and an air layer (As) is provided between the pair of disc-shaped dielectrics. A connection terminal (32) of the center contact is joined to the printed circuit board, and the front end edge of the curved tubular shell surrounding the connection terminal is surface-mounted on the printed circuit board.

Description

Mounting structure of coaxial connector

Technical Field

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

Background

In general, a printed circuit board is disposed in an Electronic Toll Collection System (ETC) 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. By connecting the coaxial connector on the other side to the coaxial connector, a high-frequency signal can be received from the antenna to the printed circuit board, and a high-frequency signal can be transmitted from the printed circuit board to the antenna.

A circular coaxial connector on the other side, which extends the coaxial cable in the outer circumferential direction, is generally connected to the circular coaxial connector. This circular coaxial connector is a vertical mounting type connector in which the counterpart coaxial connector is detachable from one surface of the printed circuit board in a vertical direction, that is, a so-called upper insertion type coaxial connector.

On the other hand, a horizontal-mount type connector, i.e., 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 a horizontal direction with respect to one surface of a printed circuit board, has been developed.

As for such a side insertion type coaxial connector, the following coaxial connectors have been disclosed in the related art: an L-shaped center contact is built 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 cases (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: specification of U.S. Pat. No. 5116245

Disclosure of Invention

Problems to be solved by the invention

In the coaxial connector of patent document 1, an L-shaped center contact made of a conductive small-diameter rod-like member is continuously covered with an L-shaped dielectric material having a relative dielectric constant larger than that of air from the middle portion to the terminal end portion thereof. In such a configuration, there is a problem that it is difficult to transmit a high-frequency signal through a small coaxial connector. In the future, coaxial connectors that facilitate transmission of high-frequency signals are being sought.

Further, in the coaxial connector of patent document 1, the center contact is coaxially surrounded by a pair of flanged L-shaped cylindrical split shells through an L-shaped dielectric material. The end of the L-shaped cylindrical split case is electrically connected (DIP-connected) to the printed circuit board via a set of DIP terminals provided in the flange portion. Then, there is a problem that most of the peripheral end portions of the cylinders of the pair of L-shaped cylinder-shaped divided cases may be electrically insulated from the printed substrate 9 p.

The coaxial connector of patent document 1 may have a mismatch between the impedance of the transmission path of the coaxial connector and the impedance of the circuit of the printed circuit board. A mounting structure of a coaxial connector is provided to easily match the impedance of a transmission path of the coaxial connector with the impedance of a circuit of a printed circuit board. The above is the object of the present invention.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a mounting structure of a coaxial connector, which facilitates impedance matching between the coaxial connector and a printed board.

Means for solving the problems

The present inventors have considered that, in a curved-tube-shaped housing which is provided inside a housing provided on a printed circuit board so as to be substantially parallel to one surface of the printed circuit board and has an end portion bent to the printed circuit board, a set of disc-shaped dielectrics which is housed inside the housing and supports a center contact at a central portion thereof is separately arranged in an axial direction of the housing, and a front end edge surface of the curved-tube-shaped housing is attached to the printed circuit board, whereby impedance matching between the coaxial connector and the printed circuit board is facilitated, and based on this, the following invention of a new coaxial connector attachment structure has been completed.

(1) In the mounting structure of a coaxial connector according to the present invention, the coaxial connector is mountable on one surface of a printed circuit board, and a mating coaxial connector, which is configured at a terminal end of a coaxial cable, is detachably connectable, and the mounting structure of the coaxial connector includes: a rectangular parallelepiped housing having a housing chamber on one end side, the housing chamber being formed by opening one surface of the housing so that the mating coaxial connector can be inserted; a curved tube-shaped case fixed inside the housing substantially in parallel with one surface of the printed circuit board and bent in an axial direction so as to reach the one surface of the printed circuit board on the other end side of the housing; a center contact disposed inside the curved tubular shell coaxially with the curved tubular shell along a center of an axis of the curved tubular shell; and a pair of disk-shaped dielectrics which are accommodated in the curved tubular shell and support the center contact at the center portion, wherein the curved tubular shell is provided with the pair of disk-shaped dielectrics at a distance along the axial direction of the center contact between one end portion and the other end portion, an air layer is provided between the pair of disk-shaped dielectrics, the center contact has a connection terminal which is joined to the connection portion of the printed board, and the front end edge of the curved tubular shell surrounding the connection terminal of the center contact is joined to one surface of the printed board at the other end portion of the curved tubular shell.

(2) In the mounting structure of the coaxial connector according to the above (1), preferably, the connection portion of the printed circuit board includes a through hole, the curved tubular shell is bent in an axial direction so as to face one surface of the printed circuit board, and the connection terminal of the center contact is engaged with the through hole.

(3) In the mounting structure of the coaxial connector of the above (1), preferably, the connection portion of the printed substrate includes a pattern of a substrate surface, the curved tubular shell is inclined downward in the axial direction to be close to one surface of the printed substrate, and the connection terminal of the center contact is engaged with the pattern as a surface mounting terminal.

(4) In the mounting structure of the coaxial connector according to any one of the above (1) to (3), preferably, the center contact is integrally molded with the pair of disc-shaped dielectrics, and the curved tubular shell is formed of a pair of half-cylindrical divided shells surrounding the pair of disc-shaped dielectrics from an outer circumferential direction.

Effects of the invention

In the mounting structure of the coaxial connector according to the present invention, the front end edge of the housing is joined to one surface of the printed circuit board, and therefore, impedance matching between the coaxial connector and the printed circuit board is easier than in the conventional DIP connection.

Further, the mounting structure of the coaxial connector according to the present invention includes the curved tubular shell in which the pair of disc-shaped dielectrics are arranged apart from each other in the axial direction of the center contact, and the air layer is provided between the pair of disc-shaped dielectrics, so that 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 mounting structure according to embodiment 1 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 a structure of a coaxial connector mounting structure according to embodiment 1, and shows an external appearance from the side opposite to fig. 1 in a state where the coaxial connector is mounted on one surface of a printed circuit board.

Fig. 3 is an exploded perspective view showing the structure of the mounting structure of the coaxial connector according to embodiment 1.

Fig. 4A is a plan view showing a structure of a housing provided in the coaxial connector mounting structure according to embodiment 1.

Fig. 4B is a front view showing a structure of a housing provided in the mounting structure of the coaxial connector according to embodiment 1.

Fig. 4C is a rear view showing the structure of a housing provided in the mounting structure of the coaxial connector according to embodiment 1.

Fig. 5A is a configuration of a housing provided in the mounting structure of the coaxial connector according to embodiment 1, and is a perspective view showing the appearance of the rear surface, the upper surface, and the left side surface.

Fig. 5B is a configuration of a housing provided in the mounting structure of the coaxial connector according to embodiment 1, and is a perspective view showing the appearance of the back surface, the lower surface, and the right side surface.

Fig. 5C is a perspective view showing the external appearance of the rear surface and the right side surface of the housing provided in the coaxial connector mounting structure according to embodiment 1.

Fig. 6 is an enlarged perspective view of a main part of the mounting structure of the coaxial connector according to embodiment 1, showing 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 a center contact provided in the mounting structure of the coaxial connector according to embodiment 1, and shows a state in which the center contact is 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 mounting structure of the coaxial connector according to embodiment 1.

Fig. 9A is a longitudinal sectional view showing the structure of the mounting structure of the coaxial connector according to embodiment 1, 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 mounting structure of the coaxial connector according to embodiment 1, and shows a state after the coaxial connector on the mating side is connected.

Fig. 10A is a perspective view showing a structure of a mounting structure of the coaxial connector according to embodiment 1, and shows a vertical cross section of a state after the coaxial connector on the mating side is connected.

Fig. 10B is an enlarged view of a main portion of fig. 10A.

Fig. 11A is a perspective view showing a structure of a coaxial connector mounting structure according to embodiment 2 of the present invention, and is a longitudinal section showing a state after a counterpart coaxial connector is connected.

Fig. 11B is an enlarged view of a main portion of fig. 11A.

Description of the reference symbols

1: a housing;

2. 6: a curved tubular shell;

3. 7: a center contact;

4a, 4 b: a set of disc-shaped dielectrics;

9 p: a printed substrate;

10. 20: a coaxial connector;

11: a storage chamber;

32: a connection terminal;

80: a coaxial plug (counterpart coaxial connector);

91 p: one surface of the printed substrate;

as: an air layer;

cb: a coaxial cable;

ht: and a through hole.

Detailed Description

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

[ embodiment 1 ]

(Structure of mounting Structure of coaxial connector)

First, a structure of a coaxial connector mounting structure according to embodiment 1 of the present invention will be described.

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

Fig. 3 is an exploded perspective view showing the structure of the mounting structure of the coaxial connector according to embodiment 1. Fig. 4A to 4C are views showing the structure of a housing provided in the mounting structure of the coaxial connector according to embodiment 1, 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 views showing the structure of a housing provided in the mounting structure of the coaxial connector according to embodiment 1, fig. 5A is a perspective view showing the appearance of the rear surface, the upper surface, and the left side surface of the housing, fig. 5B is a perspective view showing the appearance of the rear surface, the lower surface, and the right side surface of the housing, and fig. 5C is a perspective view showing the appearance of the rear surface and the right side surface of the housing.

Fig. 6 is an enlarged perspective view of a main part of the mounting structure of the coaxial connector according to embodiment 1, showing 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 a center contact provided in the mounting structure of the coaxial connector according to embodiment 1, and shows a state in which the center contact is 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 mounting structure of the coaxial connector according to embodiment 1. Fig. 9A and 9B are longitudinal sectional views showing the structure of the coaxial connector mounting structure according to embodiment 1, with fig. 9A showing a state before the mating coaxial connector is connected and fig. 9B showing a state after the mating coaxial connector is connected.

Fig. 10A and 10B are perspective views showing the structure of the mounting structure of the coaxial connector according to embodiment 1, in which fig. 10A is a vertical cross section showing a state after the coaxial connector on the mating side is connected, and fig. 10B is an enlarged view of a main portion of fig. 10A.

(Overall Structure)

Referring to fig. 1 to 10A and 10B, the coaxial connector 10 according to embodiment 1 of the present invention is attachable to one surface 91p of the printed circuit board 9p, and is capable of detachably connecting a mating coaxial connector (hereinafter referred to as a coaxial plug) 80 formed at the end of the coaxial cable Cb.

Referring to fig. 1 to 10A and 10B, the 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, 5A to 5C, and 9A, the housing 1 has a housing chamber 11 at one end side thereof. The housing chamber 11 is formed by opening one surface of the housing 1 in a rectangular shape, and a coaxial plug 80 (see fig. 9A and 9B) can be inserted into the housing chamber 11.

Referring to fig. 1 or 3 and fig. 9A, 9B or 10A, 10B, the curved tubular case 2 is fixed inside the case 1 substantially in parallel with the one surface 91p of the printed circuit board 9p, and is formed to be bent in the axial direction so as to reach the one surface 91p of the printed circuit board 9p on the other end side of the case 1. More specifically, one end portion side of the curved tubular case 2 is disposed in the housing chamber 11 of the housing 1, the middle portion of the curved tubular case 2 is fixed by the partition wall 12w of the housing 1, and the other end portion side of the curved tubular case 2 is configured such that the curved tubular case 2 is bent in the axial direction to face the one surface 91p of the printed circuit board 9p on the other end portion side of the housing 1. 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, 9A, 9B, 10A, 10B, the center contact 3 is disposed inside the curved tubular case 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 housed inside the curved tubular case 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 side of the contact terminal 31, and the disc-shaped dielectric 4B is disposed on the base end side of the connection terminal 32 which can be soldered to the printed board 9p (see fig. 1, 9A, and 9B), and more specifically, is disposed so as to partially support the 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 disc-shaped

dielectrics

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

dielectrics

4a, 4b are integrally molded.

Referring to fig. 6, 9A, 9B, 10A, 10B, a pair of disc-shaped dielectrics 4a, 4B are disposed in the curved tubular shell 2 so as to be separated from each other in the axial direction of the center contact 3 between one end portion and the other end portion. Thereby, the curved tubular shell 2 is provided with the air layer As between the pair of disc-shaped

dielectrics

4a, 4 b.

The coaxial connector 10 according to embodiment 1 includes the curved tubular shell 2, and in the curved tubular shell 2, 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, and therefore, according to such a configuration, the outer diameter of the shell can be further reduced, and the coaxial connector can also be downsized.

Referring to fig. 10A and 10B, the other end (edge or front edge) of the curved tubular case 2 is welded to the first surface 91p of the printed circuit board 9 p. That is, the other end portion of the curved tubular shell 2 is surface-mounted on the one surface 91p of the printed circuit board 9p at the front end edge of the curved tubular shell 2 surrounding the connection terminal 32 of the center contact, and is electrically connected to, for example, a ground pattern, not shown. The connection terminal 32 of the center contact 3, which serves as a DIP terminal here, is solder-joined to a through hole Ht formed in the printed board 9 p.

Referring to fig. 10A and 10B, in the mounting structure of the coaxial connector 10 according to embodiment 1, the front end edge of the curved tubular shell 2 is soldered to the one surface 91p of the printed circuit board 9p, and therefore, it is easier to match the impedance between the coaxial connector 10 and the printed circuit board 9p, as compared with the DIP connection using the DIP terminal provided in the flange portion of the shell in the related art.

(Structure of housing)

Next, the structure of the housing 1 of embodiment 1 will be described. 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 may be molded to obtain a rectangular parallelepiped housing 1.

Referring to fig. 1 to 5A to 5C, the housing 1 has a recess 12, and the recess 12 is continuous with the other surface and the bottom surface of the housing 1 on the opposite side of the storage chamber 11. The concave portion 12 can accommodate the curved tubular case 2. 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 partition wall 12w is provided with a press-in hole 12h (see fig. 4C or 5C).

Referring to fig. 4C or 5C, the curved tubular case 2 can be press-fitted into the press-fitting hole 12h from the recess 12 into 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, a pair of

projections

111, 111 are formed from the inner wall of the housing chamber 11 in the housing 1. The pair of

projections

111, 111 are fitted into a rectangular groove (not shown) provided in the housing 81 constituting the coaxial plug 80, and can guide the insertion of the coaxial plug 80 (see fig. 9A and 9B). The pair of

projections

111, 111 also function as keys for preventing the coaxial plug 80 from being erroneously inserted.

Referring to fig. 9B, 10A, and 10B, a lock groove 11r is formed in the inner wall of the housing chamber 11 of the housing 1. Lock lever 81r provided in coaxial plug 80 can be engaged with lock groove 11 r.

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

tab plates

5, 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

tab plates

5, 5 can be fixed to both side surfaces of the housing 1 by pressing the reinforcing tab plates 5 into the pair of

square grooves

11d, 11 d. The case 1 can be fixed to the printed board 9p by welding and joining the bottom surface of the reinforcing tab plate 5 to the one surface 91p of the printed board 9p (see fig. 1 or 2).

(construction of curved tube case and divided case of embodiment 1)

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

split cases

2a and 2b according to embodiment 1 will be described. Referring to fig. 6, the

split cases

2a and 2b are preferably made of a conductive metal body, and the conductive metal body can be molded to obtain a semi-cylindrical pair of

split cases

2a and 2 b.

Referring to fig. 6, in assembling the curved tubular shell 2, it is preferable that the center contact 3 with the pair of disc-shaped

dielectrics

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

dielectrics

4a and 4b is accommodated in the one divided shell 2 a. By joining the outer peripheral edges of the pair of

split cases

2a, 2b to each other by laser welding, a cylindrical 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. A contact terminal 31 is disposed at the opening center of one end portion of the curved tubular case 2, and a connection terminal (DIP terminal) 32 is disposed at the opening center of the other end portion of the curved tubular case 2.

Referring to fig. 9A and 9B, or fig. 10A and 10B, the other end portion (edge portion or front end edge) of the curved tubular case 2 is preferably soldered to the one surface 91p of the printed circuit board 9p, and the curved tubular 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 embodiment 1 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 may be bent to obtain the center contact 3 having the other end bent at a substantially right angle to the one end. The center contact 3 is preferably 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 a base end portion and a connection terminal 32 at a tip end portion. The contact terminal 31 can be connected to a center contact 83 disposed on the coaxial plug 80 (see fig. 9A and 9B, or fig. 10A and 10B).

Referring to fig. 9A and 9B, or fig. 10A and 10B, the connection terminal 32 is connected to a through hole Ht formed in the printed board 9 p. The connection terminal 32 may be through-hole-mounted on the printed circuit board 9p as a DIP terminal, but may be surface-mounted together with the distal 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 80 according to embodiment 1 will be described. Referring to fig. 9A and 9B or fig. 10A and 10B, the coaxial plug 80 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 fluorine-based resin surrounding the center conductor Wc; an external conductor Wb such as a braided wire surrounding the dielectric Di; and an insulating sheath Wi covering and protecting the outer conductor Wb.

Referring to fig. 9A and 9B or fig. 10A and 10B, the coaxial plug 80 includes a rectangular parallelepiped housing 81 and a metal cylindrical housing 82. The coaxial plug 80 includes a center contact 83 and a pair of disc-shaped

dielectrics

84a and 84 b.

Referring to fig. 9A and 9B or fig. 10A and 10B, the middle of the case 82 is supported by the housing 81. One end of the shell 82 is connected to the outer conductor Wb. The other end of the housing 82 can be connected to one end of the curved tubular housing 2. One end of the center contact 83 is wired to the center conductor Wc. The other end of the center contact 83 is connectable with the center contact 3. A set of

dielectrics

84a, 84b is arranged inside the shell 82 in such a way that the central contact 83 is coaxial with the shell 82.

[ Effect of the coaxial connector mounting Structure of embodiment 1 ]

Next, the operation and effect of the coaxial connector 10 according to embodiment 1 will be described. Referring to fig. 1 to 10A and 11B, the coaxial connector 10 includes a curved tubular shell 2, and in the curved tubular shell 2, a 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 an air layer As is provided between the pair of disc-shaped dielectrics 4a and 4B, and therefore, the outer diameter of the shell can be reduced, and the coaxial connector 10 can also be downsized. Further, referring to fig. 9A and 9B or fig. 10A and 10B, in the transmission path constituted by the curved tubular shell 2 and the center contact 3, the path from the housing 1 to the one surface 91p of the printed circuit board 9p is curved so as to draw a gentle curve, and therefore, impedance matching is easy.

Further, referring to fig. 9A and 9B or fig. 10A and 10B, in the coaxial connector 10 according to embodiment 1, the front end edge of the curved tubular shell 2 is soldered to the one surface 91p of the printed circuit board 9p, and therefore, it is easier to match the impedance between the coaxial connector 10 and the printed circuit board 9p than in the conventional DIP connection.

Further, referring to fig. 6, 9A, 9B, 10A, 10B, the coaxial connector 10 according to embodiment 1 can obtain a gapless cylindrical curved tubular shell 2 by joining the outer peripheral edges of the pair of split shells 2a, 2B to each other by laser welding. And, it is easy to transmit a high frequency signal to the center contact 3.

[ 2 nd embodiment ]

(Structure of mounting Structure of coaxial connector)

Next, the structure of the mounting structure of the coaxial connector according to embodiment 2 of the present invention will be described.

Fig. 11A and 11B are perspective views showing a structure of a coaxial connector mounting structure according to embodiment 2 of the present invention, fig. 11A is a longitudinal section showing a state after a counterpart coaxial connector is connected, and fig. 11B is an enlarged view of a main portion of fig. 11A.

Since members denoted by the same reference numerals as those used in embodiment 1 have the same functions, description thereof may be omitted below.

(Overall Structure)

Referring to fig. 11A and 11B, the coaxial connector 20 according to embodiment 2 of the present invention is attachable to one surface 91p of the printed circuit board 9p, and is detachably connectable to a mating coaxial connector (hereinafter referred to as a coaxial plug) 80 provided at an end of the coaxial cable Cb.

Referring to fig. 11A and 11B, the coaxial connector 20 includes a rectangular parallelepiped housing 1 and a metal curved tubular housing 6. The coaxial connector 20 includes a rod-shaped center contact 7 and a pair of disc-shaped

dielectrics

4a and 4 b.

The curved tube-like case 6 is fixed inside the housing 1 substantially in parallel with the one surface 91p of the printed circuit board 9p, and is bent in the axial direction so as to reach the one surface 91p of the printed circuit board 9p on the other end side of the housing 1. More specifically, one end portion side of the curved tubular case 2 is disposed in the housing chamber 11 of the housing 1, the middle portion of the curved tubular case 2 is fixed by the partition wall 12w of the housing 1, and the other end portion side of the curved tubular case 2 is inclined downward on the other end portion side of the housing 1 so as to approach the one surface 91p of the printed board 9p in the axial direction of the curved tubular case 6 and reach the one surface 91p of the printed board 9 p. In the embodiment, the curved tubular shell 6 is constituted by a set of

split shells

6a, 6b of a semi-cylindrical shape.

The center contact 7 is disposed inside the curved tubular shell 6. The center contact 7 is disposed coaxially with the curved tubular shell 6 along the axial center of the curved tubular shell 6.

Referring to fig. 11A and 11B, a pair of disc-shaped dielectrics 4a and 4B is housed inside a curved tubular case 6. A set of disc-shaped

dielectrics

4a, 4b supports a center contact 7 at each center portion. The disc-shaped dielectric 4a is disposed on the base end side of the contact terminal 71, and the disc-shaped dielectric 4b is disposed on the base end side of the connection terminal 72 engageable with the surface of the one surface 91p of the printed board 9p, and more specifically, is disposed so as to partially support the downward inclined portion of the center contact 7. The disc-shaped dielectric 4a has a thickness larger than that of the disc-shaped dielectric 4 b. The arrangement and thickness of the disc-shaped

dielectrics

4a and 4b may be in other arrangements and other thickness relations as necessary. In an embodiment, the center contact 7 and the set of disc-shaped

dielectrics

4a, 4b are integrally molded.

Referring to fig. 11A and 11B, the curved tubular shell 6 has a pair of disc-shaped dielectrics 4a and 4B arranged between one end and the other end so as to be separated in the axial direction of the center contact 7. Thereby, the curved tubular shell 6 is provided with the air layer As between the pair of disc-shaped

dielectrics

4a, 4 b.

The coaxial connector 20 according to embodiment 2 includes the curved tubular shell 6, and in the curved tubular shell 6, 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 7, and the air layer As is provided between the pair of disc-shaped

dielectrics

Referring to fig. 11A and 11B, the other end (edge or front edge) of the curved tubular case 6 is welded to the first surface 91p of the printed circuit board 9 p. That is, the front end edge of the curved tubular case 6 is surface-mounted on the printed circuit board 9p, and is electrically connected to, for example, a ground pattern not shown. The center contact 7 has a connection terminal 72 at its front end that can be engaged with a connection portion of the printed substrate 9 p. Here, the connection terminal 72 is a surface-mount terminal, and is soldered to a pattern formed on the one surface 91p of the printed board 9 p.

Referring to fig. 11A and 11B, in the coaxial connector 20 according to embodiment 2, the front end edge of the curved tubular shell 6 is welded and joined to the one surface 91p of the printed circuit board 9p, and therefore, it is easier to match the impedance between the coaxial connector 20 and the printed circuit board 9p, compared to the DIP connection using the DIP terminal provided in the flange portion of the shell in the related art.

(Structure of curved tubular case and divided case of embodiment 2)

Next, the structure of the curved tubular case 6 and the pair of

split cases

6a and 6b of embodiment 2 will be described. Referring to fig. 11A and 11B, the split cases 6a and 6B are preferably made of a conductive metal body, and the conductive metal body can be molded to obtain a semi-cylindrical pair of split cases 6a and 6B.

Referring to fig. 11A and 11B, in assembling the curved tubular shell 2, it is preferable that the center contact 7 with the pair of disc-shaped dielectrics 4a and 4B is surrounded by the other divided shell 6B in a state where the center contact 7 with the pair of disc-shaped dielectrics 4a and 4B is housed in the one divided shell 6 a. By joining the outer peripheral edges of the pair of

split cases

6a and 6b to each other by laser welding, a cylindrical curved tubular case 6 without a gap can be obtained. And, it is easy to transmit a high frequency signal to the center contact 7. A contact terminal 71 is disposed at the opening center of one end portion of the curved tubular case 6, and a connection terminal (surface mount terminal) 72 is disposed at the opening center of the other end portion of the curved tubular case 6.

Referring to fig. 11A and 11B, the other end (edge or front edge) of the curved tubular case 6 is preferably soldered to the one surface 91p of the printed circuit board 9p, so that the curved tubular case 6 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 7 according to embodiment 2 will be described. Referring to fig. 11A and 11B, the center contact 7 is preferably formed of a conductive metal rod, and the conductive metal rod may be bent to obtain the center contact 7 having the other end bent at about 45 degrees with respect to the one end. The center contact 7 is preferably composed of a copper alloy, but is not limited to a copper alloy.

Referring to fig. 11A and 11B, the center contact 7 has a contact terminal 71 at a base end portion and a connection terminal (surface mount terminal) 72 at a tip end portion. The contact terminal 71 can be connected to a center contact 83 disposed on the coaxial plug 80.

Referring to fig. 11A and 11B, the tip end portions of the connection terminals (surface-mount terminals) 72 are arranged along the one surface 91p of the printed circuit board 9p so as to be surface-mountable on the one surface 91p of the printed circuit board 9 p. The connection terminal (surface-mount terminal) 72 can be surface-mounted together with the front end edge of the curved tubular case 6.

[ Effect of the coaxial connector mounting Structure of embodiment 2 ]

Next, the operation and effect of the coaxial connector 20 according to embodiment 2 will be described. Referring to fig. 11A and 11B, the coaxial connector 20 includes the curved tubular shell 6, and the pair of disc-shaped dielectrics 4a and 4B are arranged in the curved tubular shell 6 so As to be separated from each other in the axial direction of the center contact 7, and the air layer As is provided between the pair of disc-shaped dielectrics 4a and 4B, and therefore, according to such a configuration, the outer diameter of the shell can be reduced, and the coaxial connector 20 can also be downsized. Further, in the transmission path constituted by the curved tubular case 6 and the center contact 7, the path from the housing 1 to the one surface 91p of the printed substrate 9p is inclined downward so as to draw a gentle curve, and therefore impedance matching is easy.

Further, referring to fig. 11A and 11B, in the coaxial connector 20 according to embodiment 2, the front end edge of the curved tubular shell 6 is soldered to the one surface 91p of the printed circuit board 9p, and therefore, it is easier to match the impedance between the coaxial connector 20 and the printed circuit board 9p than in the conventional DIP connection.

Further, referring to fig. 11A and 11B, the coaxial connector 20 according to embodiment 2 can obtain a cylindrical curved tubular shell 6 without a gap by joining the outer peripheral end edges of the pair of split shells 6a and 6B by laser welding. And, it is easy to transmit a high frequency signal to the center contact 7.

Comparing fig. 10A, 10B with fig. 11A, 11B, there are the following differences: while the curved tube portions of the curved tube-shaped shell 2 and the center contact 3 of embodiment 1 are bent at substantially right angles so as to draw gentle curves, the curved tube portions of the curved tube-shaped shell 6 and the center contact 7 of embodiment 2 are bent gently at a predetermined angle (for example, 45 degrees) smaller than the right angle and are inclined downward toward the one surface 91p of the printed circuit board 9 p. Thus, the coaxial connector 20 according to embodiment 2 ensures the linearity of the transmission path, and can transmit a higher-speed signal to the printed circuit board 9 p.

Claims

1. A mounting structure of a coaxial connector which can be mounted on one surface of a printed circuit board and to which a mating coaxial connector is detachably connected, the mating coaxial connector being configured at a distal end of a coaxial cable,

the coaxial connector mounting structure includes:

a rectangular parallelepiped housing having a housing chamber on one end side, the housing chamber being formed by opening one surface of the housing so that the mating coaxial connector can be inserted;

a curved tube-shaped case fixed inside the housing substantially in parallel with one surface of the printed circuit board and bent in an axial direction so as to reach the one surface of the printed circuit board on the other end side of the housing;

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

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

the curved tubular shell is provided with a set of the disc-shaped dielectrics at a distance in the axial direction of the center contact between one end portion and the other end portion, an air layer is provided between the set of the disc-shaped dielectrics,

the center contact has a connection terminal joined to a connection portion of the printed board, and the impedance of the coaxial connector and the printed board is matched by performing surface mounting in which the entire front end edge of the curved shell surrounding the connection terminal of the center contact is solder-joined to one surface of the printed board at the other end portion of the curved shell.

2. The mounting configuration of a coaxial connector according to claim 1,

the connecting portion of the printed board includes a through hole, the bent tubular case is bent in an axial direction to be opposed to one surface of the printed board, and the connecting terminal of the center contact is engaged with the through hole.

3. The mounting configuration of a coaxial connector according to claim 1,

the connecting portion of the printed substrate includes a pattern of a substrate surface, an axial direction of the curved tubular shell is inclined downward to be close to one face of the printed substrate, and the connecting terminal of the center contact is engaged with the pattern.

4. The mounting construction of a coaxial connector according to any one of claims 1 to 3,

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.