JP3028914B2 - Coaxial connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention removably connects a coaxial cable forming a signal transmission path to a printed circuit board in various electronic devices such as a car navigation system and a portable telephone, which have recently become widespread. The present invention relates to a coaxial connector that is suitable for

[0002]

2. Description of the Related Art A coaxial connector of this type has a diameter of 1 mm.
2. Description of the Related Art Conventionally, an extremely thin coaxial cable of about 2 mm to 2 mm is detachably connected to a printed circuit board. Japanese Patent Application Laid-Open No. Hei 5-226030 shows an example of such a structure, in which an end of a coaxial cable is provided with, for example, an L-shaped plug, and a printed circuit board is provided with a receptacle to which the plug is detachably fitted. These components constitute a coaxial connector.

Here, the plug comprises a cylindrical plug body connected to the outer conductor of the coaxial cable, a contact tube held insulated inside the plug body and connected to the center conductor of the coaxial cable. Correspondingly, the receptacle is connected to a ground circuit of a printed circuit board, and is connected to a cylindrical receptacle body detachably fitted to the plug body and connected to a signal circuit of the printed circuit board. The contact tube is configured to have a contact pin detachably fitted to the contact tube. The structure in which the plug provided at the end of the coaxial cable has the contact tube connected to the center conductor of the coaxial cable is disclosed in Japanese Utility Model Laid-Open No. 3-683.
No. 77 and Japanese Patent Application Laid-Open No. 4-282580.

[0004]

As described in the above publications, a conventional coaxial connector having a structure in which a plug has a contact tube connected to a central conductor of a coaxial cable is provided with a plug and a print on the coaxial cable side. The connection with the receptacle on the circuit board side is made by press-fitting the plug body and the receptacle body and press-fitting the contact tube and contact pin at the same time. There is a problem that defects are likely to occur.

[0005] Further, if the plug is twisted during the attachment / detachment work between the plug and the receptacle, the fitting accuracy between the contact tube and the contact pin is reduced, and conduction failure is likely to occur. In particular, the attachment / detachment between the plug and the receptacle is difficult. When repeated many times, abrasion occurs between the contact tube and the contact pin, causing poor conduction, and the durability of attachment / detachment is as low as about 200 to 1000 times.

Accordingly, the present invention is to provide a coaxial connector capable of dramatically improving the durability of attachment and detachment and ensuring a stable conduction state for a long period of time even if the fitting accuracy is rough. With the goal.

[0007]

According to a first aspect of the present invention, there is provided a rectangular plug provided at an end of a coaxial cable, and a receptacle provided on a substrate surface. In the coaxial connector, the plug has a plug body connected to a jacket conductor of the coaxial cable, and a spring contact pin connected to a center conductor of the coaxial cable and held in an insulated state inside the plug body. The receptacle is connected and fixed to a ground circuit on the board surface, has a rectangular tubular receptacle body that detachably fits the plug body and prevents the plug body from coming off, and is used for fitting the plug body and the receptacle body. Accordingly, the tip of the spring-type contact pin elastically contacts the signal circuit on the substrate surface from the vertical direction.

According to a second aspect of the present invention, there is provided a coaxial connector provided with a rectangular cylindrical plug provided at an end of a coaxial cable and a receptacle provided on a substrate surface, wherein the plug comprises an outer cover of the coaxial cable. A plug body connected to the conductor, and a contact block connected to the center conductor of the coaxial cable and held in an insulated state inside the plug body, wherein the receptacle is connected and fixed to a ground circuit on the board surface. A rectangular tubular receptacle body that detachably fits the plug body to prevent the plug body from coming off, and a spring-type contact pin that is connected and fixed to a signal circuit on the substrate surface and arranged inside the receptacle body, With the fitting of the plug body and the receptacle body, the tip of the spring-type contact pin is perpendicular to the contact block. Characterized by sexual contact.

A third aspect of the present invention relates to a plug of the plug body.
The lugs are provided with projections, and the receptacle
When the plug body is attached to the
It is characterized in that an engaging hole for fitting is formed .

[0010]

In the coaxial connector according to the first aspect of the present invention employing such means, the plug body of the plug provided at the end of the coaxial cable is inserted into the receptacle body of the receptacle provided on the substrate surface and fitted. By doing so, the coaxial cable and the board are connected with the tip of the spring-type contact pin of the plug elastically contacting the signal circuit on the board surface in the vertical direction. As a result, the center conductor of the coaxial cable is electrically connected to the signal circuit on the board surface via the spring contact pin, and the jacket conductor of the coaxial cable is connected to the ground circuit on the board surface via the plug body and the receptacle body. It becomes electrically conductive.

In the coaxial connector according to the second aspect of the present invention, the plug main body of the plug provided at the end of the coaxial cable is inserted into and fitted to the receptacle main body of the receptacle provided on the substrate surface. The coaxial cable and the board are connected with the tip of the spring contact pin of the receptacle elastically contacting the contact block of the plug from the vertical direction. As a result, the center conductor of the coaxial cable is electrically connected to the signal circuit on the board surface via the contact block and the spring contact pin, and the jacket conductor of the coaxial cable is connected to the board surface via the plug body and the receptacle body. Conducts electrical connection to the ground circuit.

The spring-type contact pin according to the first or second aspect of the present invention has a tip directly perpendicular to an outlet block of a plug connected to a signal circuit on a substrate surface or a center conductor of a coaxial cable. Because of the structure that makes elastic contact from the direction, even if the plug and the receptacle are repeatedly attached and detached many times, and even if the plug is twisted during the attaching and detaching operation, the spring contact pin is This ensures contact with the contact block of the signal circuit or plug, does not cause conduction failure due to wear, and greatly improves durability. In the first and second inventions,
The plug and the receptacle body are formed in a square tube shape
Because the plug body and the receptacle body are fitted
Sometimes, they do not rotate relative to each other.
Even if the fitting accuracy is rough and the fitting pressure is relatively small, the plug
The body does not accidentally fall out of the receptacle body.
In addition, a stable conduction state is ensured for a long time.

[0013] In the coaxial connector of the third invention, the plug connector
An engaging projection is provided on the plug of the body,
When the plug body is attached to the receptacle body,
Since the projection is formed with an engagement hole, the plug is
When inserted into the receptacle body, a click
As a result, the connection work can be performed reliably.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments corresponding to the first to third aspects of the present invention will be specifically described below with reference to the accompanying drawings. In FIG. 1 showing the entire structure of a coaxial connector 1 of a first embodiment corresponding to the first invention, reference numeral 2 denotes an L-shaped plug crimp-fixed to an end of a small-diameter coaxial cable 3 having a diameter of about 1.2 mm. And has a conductive metal plug body 4 crimped to the outer conductor 3a of the coaxial cable 3 and a conductive metal spring contact pin 5 crimped to the center conductor 3b of the coaxial cable 3. Reference numeral 6 denotes a receptacle mounted on the board surface of a printed circuit board 7 corresponding to a surface mount electronic component. The receptacle body 8 is made of a conductive metal and fixed to the printed circuit board 7 by soldering and connected to its ground circuit. And a holder 9 made of insulating resin surrounding the periphery of the receptacle body 8.

The plug body 4 of the L-shaped plug 2 is shown in FIG.
As shown in FIG. 7, the connecting portion 4 has a plurality of holding claws 4a for holding the end of the coaxial cable 3 and is pressed and bent into a predetermined shape.
b, and a substantially square cylindrical plug portion 4c that is bent substantially at right angles to the connection portion 4b.

Here, as shown in FIGS. 2 and 3, inside the connecting portion 4b of the plug body 4, an outer conductor 3a of the coaxial cable 3 whose outer skin is peeled off and exposed, and an inner side of the outer conductor 3a And the fixing ring 10 fitted to the insulating coating 3c of the coaxial cable 3 faces. The connecting portion 4b is crimped to the fixing ring 10 by the holding claws 4a, so that the connecting portion 4b and the outer conductor 3a are electrically connected to each other.

Of the outer peripheral surfaces of the plug portion 4c of the plug body 4 except for the outer peripheral surface on the side of the connection portion 4b, small engaging projections 4 are provided at the center in the width direction.
d, 4d, and 4d are formed by stamping, respectively. The spring-type contact pin 5 is held in an insulated state via an insulator 11 at the inner central portion of such a plug portion 4c.

Here, the spring-type contact pin 5 is composed of a pipe member 5a having a closed upper end to which a center conductor 3b projecting from an end of an insulating coating 3c of the coaxial cable 3 is fixed by caulking, and the inside of the pipe member 5a. The contact pin 5b is a combination of a contact pin 5b fitted in the pipe member 5a so as to prevent the contact pin 5a from sliding back and forth, and a coil spring 5c housed in the pipe member 5a and urging the contact pin 5b in the advance direction. Protrudes from the opening of the plug portion 4c, and a hemispherical contact head 5d is formed at the tip thereof.

FIGS. 8A to 8C show an example of an operation process for connecting the center conductor 3b of the coaxial cable 3 to the pipe member 5a of the spring contact pin 5.
As shown in FIG. 8A, a ring groove 5e around which a center conductor 3b bent in a hook shape is wound is formed on a peripheral surface of an upper end portion of the pipe member 5a. Then, as shown in FIG. 8B, in a state where the center conductor 3b is wound around the ring groove 5e, the peripheral edge of the upper end of the pipe member 5a is caulked by the curved concave portion 12a of the caulking jig 12, thus forming the center conductor 3b. And the pipe member 5a are crimp-connected.

The pipe member 5a and the central conductor 3b
The connection operation with the device can be performed by the method shown in FIGS. 9A and 9B or by the method shown in FIG. Here, in the method shown in FIGS. 9A and 9B, a straight groove 5f is formed on the upper end surface of the pipe member 5a instead of the ring groove 5e, and the straight groove 5f is linearly drawn from the insulating coating 3c. Inserted center conductor 3b. Then, both side edges of the upper end of the pipe member 5a are caulked by the curved concave portion 12a of the caulking jig 12, so that the linear groove 5f is caulked to be narrow, and the center conductor 3b and the pipe member 5
a is connected by crimping. In the method shown in FIG. 10, a pair of left and right pinching ridges 5 is used instead of the ring groove 5e and the linear groove 5f.
g, 5g are formed on the upper end surface of the pipe member 5a, and the center conductor 3b is pushed into the holding groove 5h between the holding ridges 5g, 5g to be held and connected.

On the other hand, in the receptacle 6, as shown in the bottom view of FIG. 11, the holder 9 has a substantially square cylindrical shape, and the receptacle body 8 is provided inside the holder.
The receptacle body 8 is pressed into a predetermined shape as shown in FIGS.
Are bent into a substantially square cylindrical shape into which the plug portion 4c is fitted, and three cut-and-pressed pressure-contacting pieces 8 corresponding to the three outer peripheral surfaces having the engagement protrusions 4d of the plug portion 4c.
a, 8a, 8a, and three connecting legs 8b, 8b, 8b which are bent substantially at right angles to each of the cut and raised press contact pieces 8a, and each of the cut and raised press contact pieces 8a is provided with a plug. An engagement hole 8c into which each engagement protrusion 4d of the portion 4c is fitted is formed. As shown in FIG. 12, the peripheral wall portion of the receptacle body 8 without the cut-and-raised press-contact pieces 8a, 8a, 8a
Butt ends 8d, 8d slightly bent inward in advance
In the state where the plug portion 4c is fitted, the backlash can be prevented.

Such a receptacle 6 is arranged at a predetermined position on a printed circuit board 7 by a chip mounter as one of the surface mount electronic components, and is connected to each connection leg 8b of the receptacle body 8 in a process of passing through a high-temperature bath. , 8b,
8b is soldered and fixed to a ground circuit formed around the signal circuit on the printed circuit board 7.

Next, the operation of the thus configured coaxial connector 1 of the first embodiment will be described. In connecting the coaxial cable 3 and the printed circuit board 7, the L-shaped plug 2 fixed to the end of the coaxial cable 3 is picked up, and the plug 4 c of the plug body 4 is inserted into the receptacle body 8 of the receptacle 6. Press it in until Then, the spring-type contact pin 5 arranged inside the plug portion 4c
The contact head 5d at the tip of the contact pin 5b makes elastic contact with the signal circuit of the printed circuit board 7 from the vertical direction, and the outer peripheral surface of the plug portion 4c is pressed against each cut-and-pressed pressure contact piece 8a of the receptacle body 8. Each of the engaging projections 4d protruding from the outer peripheral surface of the plug portion 4c is cut and raised to form a press contact piece 8.
The plug body 4 and the receptacle body 8 are connected with a click feeling by fitting into the respective engagement holes 8c of a, and thus the L-shaped plug 2 and the receptacle 6 are connected.

Thus, the center conductor 3 of the coaxial cable 3
b is electrically connected to the signal circuit of the printed circuit board 7 via the spring-type contact pins 5, and the outer conductor 3 a of the coaxial cable 3 is connected to the signal circuit of the printed circuit board 7 via the plug body 4 and the receptacle body 8. Conducts electrical connection to the ground circuit.

Here, in the coaxial connector 1 of the first embodiment,
Since the spring-type contact pins 5 are used to directly and elastically contact the signal circuit on the printed circuit board 7 from the vertical direction, the fitting accuracy between the L-shaped plug 2 and the receptacle 6 is rough. Also, even if the L-type plug 2 is torn during the attachment / detachment work between the L-type plug 2 and the receptacle 6, the spring-type contact pin 5 reliably contacts the signal circuit of the printed circuit board 7. Even if the attachment / detachment work of the L-shaped plug 2 and the receptacle 6 is repeated many times, the spring-type contact pins 5 do not suffer from conduction failure due to wear.

Therefore, according to the coaxial connector 1 of the first embodiment, it is not necessary to make the fitting accuracy between the L-shaped plug 2 and the receptacle 6 high, and the manufacturing cost is greatly reduced as compared with the conventional example. In addition, in particular, the durability of attachment and detachment is, for example, 2
It is dramatically improved to more than 000 times.

In the coaxial connector 1 of the first embodiment, since the plug portion 4c of the plug main body 4 and the receptacle main body 8 are formed in a substantially square cylindrical shape, the plug portion 4c is fitted in the coaxial connector 1 in the fitted state. And the receptacle body 8 do not rotate relative to each other. Therefore, even when the fitting accuracy between the plug portion 4c and the receptacle main body 8 is rough and the fitting pressure is relatively small, the plug portion 4c does not fall out of the receptacle main body 8 carelessly and is stable. The conduction state is ensured for a long time.

Further, in the coaxial connector 1 of the first embodiment, the respective engagement projections 4d of the plug portion 4c of the plug body 4 are fitted into the respective engagement holes 8c of the cut and raised press contact pieces 8a of the receptacle body 8 at the time of connection. To get a click feeling,
The connection operation can be reliably performed by relying on the click feeling, and mistakes in the connection operation can be avoided.

FIG. 17 shows the entire structure of the coaxial connector 13 of the second embodiment corresponding to the second invention. The coaxial connector 13 has a configuration in which the spring-type contact pin 5 is removed from the L-shaped plug 2 in the coaxial connector 1 of the first embodiment, and a spring-type contact pin 14 having substantially the same configuration is provided on the receptacle 6 side. The other structure is the coaxial connector 1 of the first embodiment.
Therefore, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

The L-shaped plug 2 of the coaxial connector 13 is
As shown in FIG. 18, the coaxial cable 3 includes a plug body 4 that is crimped to the outer conductor 3 a and a contact block 15 that is crimped to the center conductor 3 b of the coaxial cable 3. The contact block 15 has a ring groove 15 around which the center conductor 3b bent in a hook shape is wound.
a is a short columnar shape formed on the peripheral surface, and is crimped by the curved concave portion 12a of the crimping jig 12 to be crimp-connected to the center conductor 3b. And such a contact block 15 is provided with the insulator 11
Is held in an insulated state at the center back of the plug portion 4c.

On the other hand, the receptacle 6 of the coaxial connector 13
17, a receptacle body 8 connected to a ground circuit of the printed circuit board 7, a holder 9 surrounding the periphery of the receptacle body 8, and a receptacle body 8
And a spring-type contact pin 14 which is held in an insulated state via an insulator 16 at an inner central portion of the inside. The spring type contact pin 14 is connected to a signal circuit of the printed circuit board 7 by soldering and connected to the signal circuit.
a, and a coil spring 14c housed in the pipe member 14a and biasing the contact pin 14b in the advance direction. A hemispherical contact head 14d is formed at the tip of the contact pin 14b.

In the coaxial connector 13 of the second embodiment configured as described above, the coaxial cable 3 and the printed circuit board 7
When the plug portion 4c of the plug body 4 of the L-shaped plug 2 is pushed into the receptacle body 8 of the receptacle 6 as far as it will go, the contact pins of the spring-type contact pins 14 arranged inside the receptacle body 8 The contact head 14d at the tip of 14b makes elastic contact with the contact block 15 disposed at the center back of the plug 4c from the vertical direction. Further, the outer peripheral surface of the plug portion 4c is pressed against the cut and raised press contact piece 8a of the receptacle body 8, and each of the engagement protrusions 4d protruding from the outer peripheral surface of the plug portion 4c is formed by the cut and raised press contact piece 8a. By fitting into the hole 8c, the plug main body 4 and the receptacle main body 8 are connected with a click feeling, and thus the L-shaped plug 2 and the receptacle 6 are connected.

Thus, the center conductor 3 of the coaxial cable 3
b is electrically connected to the signal circuit of the printed circuit board 7 via the contact block 15 and the spring-type contact pins 14, and the outer conductor 3a of the coaxial cable 3
Is electrically connected to the ground circuit of the printed circuit board 7 via the plug body 4 and the receptacle body 8. Therefore, even with the coaxial connector 13 of the second embodiment,
The same operation and effect as those of the coaxial connector 1 of the first embodiment can be obtained.

In the above-described coaxial connector 1 of the first embodiment and the coaxial connector 13 of the second embodiment, the plug provided at the end of the coaxial cable 3 is the L-shaped plug 2; It is not necessary to set it to 2, and a straight plug may be used.

The plug portion 4c of the plug body 4 and the receptacle body 8 are substantially square cylinders. However, the invention is not limited thereto, and may be polygonal cylinders such as triangles, hexagons, and octagons. It may be a circular cylinder.

[0036]

As described above, according to the first aspect of the present invention or the second aspect of the present invention, elastic contact is made directly to the signal circuit on the substrate surface from the vertical direction. The center conductor of the coaxial cable and the signal circuit on the board surface are electrically connected via a spring-type contact pin that directly and elastically contacts the contact block connected to the center conductor of the coaxial cable from a spring-type contact pin. Because of the conduction, even if the fitting accuracy between the plug and the receptacle is rough, or if the plug is repeatedly attached and detached many times, and even if the plug is broken by the time of the attaching and detaching operation, the spring The contact pins do not cause conduction failure, and the durability of detachment as a coaxial connector can be dramatically improved. Over and can be ensured. Ma
In addition, the plug and the receptacle body are
The plug body and the receptacle body
The two do not rotate relative to each other,
Even if the mating pressure is rough and the mating pressure is relatively small,
The lug body accidentally falls off the receptacle body
And a stable conduction state can be ensured.

According to the third aspect of the present invention , the engaging projection is provided on the plug portion of the plug body.
The plug body was attached to the receptacle body.
Occasionally, an engagement hole is formed in which the engagement protrusion fits.
When the plug is inserted into the receptacle body,
Thus, a connection feeling can be obtained reliably.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a connection state of a first embodiment corresponding to the first invention and the third invention.

FIG. 2 is a longitudinal sectional view showing a structure of an L-shaped plug in the first embodiment.

FIG. 3 is a bottom view showing the structure of the L-shaped plug in the first embodiment.

FIG. 4 is a front sectional view showing the structure of the plug body in the first embodiment.

FIG. 5 is a right side view showing the structure of the plug body in the first embodiment.

FIG. 6 is a left side view showing the structure of the plug body in the first embodiment.

FIG. 7 is a bottom view showing the structure of the plug body in the first embodiment.

FIGS. 8 (a) to (c) are process diagrams of a connection operation between a spring-type contact pin and a center conductor of a coaxial cable in the first embodiment.

FIGS. 9A and 9B are process diagrams showing a modification of the connection operation between the spring-type contact pin and the center conductor of the coaxial cable in the first embodiment.

FIG. 10 is a process diagram showing another modification of the connection operation between the spring-type contact pin and the center conductor of the coaxial cable in the first embodiment.

FIG. 11 is a bottom view showing the structure of the receptacle in the first embodiment.

FIG. 12 is a front view showing the structure of the receptacle main body in the first embodiment.

FIG. 13 is a right side view showing the structure of the receptacle main body in the first embodiment.

FIG. 14 is a rear view showing the structure of the receptacle body in the first embodiment.

FIG. 15 is a longitudinal sectional view showing the structure of the receptacle body in the first embodiment.

FIG. 16 is a transverse sectional view showing the structure of the receptacle body in the first embodiment.

FIG. 17 is a longitudinal sectional view showing a connection state of a second embodiment corresponding to the second invention.

FIG. 18 is a longitudinal sectional view showing a structure of an L-shaped plug in a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coaxial connector 2 L-shaped plug 3 Coaxial cable 3a Outer conductor 3b Center conductor 3c Insulation coating 4 Plug body 4a Holding claw 4b Connection part 4c Plug part 4d Engagement protrusion 5 Spring contact pin 5a Pipe member 5b Contact pin 5c coil Spring 5d Contact head 5e Ring groove 5f Linear groove 5g Nipping ridge 5h Nipping groove 6 Receptacle 7 Printed circuit board 8 Receptacle body 8a Cut-and-press pressure contact piece 8b Connection leg 8c Engagement hole 8d Butt end 9 Holder 10 Fixing ring DESCRIPTION OF SYMBOLS 11 Insulator 12 Caulking jig 12a Curved concave part 13 Coaxial connector 14 Spring contact pin 14a Pipe member 14b Contact pin 14c Coil spring 14d Contact head 15 Contact block 16 Insulator

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01R 17/00-17/18

Claims (3)

(57) [Claims] 1. A square tube provided at an end of a coaxial cable.
A coaxial connector comprising: a plug shaped like a plug; and a receptacle mounted on a board surface, wherein the plug is connected to a jacket conductor of a coaxial cable, and the plug body connected to a center conductor of the coaxial cable. And a spring-type contact pin held in an insulated state inside the receptacle. The receptacle is connected to and fixed to a ground circuit on a substrate surface, and is a rectangular cylindrical receptacle that detachably fits the plug body and prevents the plug from coming off. A coaxial connector having a main body, wherein a tip of the spring-type contact pin elastically contacts a signal circuit on a substrate surface from a vertical direction as the plug main body and the receptacle main body are fitted. 2. A square tube provided at an end of a coaxial cable.
A coaxial connector comprising: a plug shaped like a plug; and a receptacle mounted on a board surface, wherein the plug is connected to a jacket conductor of a coaxial cable, and the plug body connected to a center conductor of the coaxial cable. And a contact block that is held in an insulated state inside the receptacle. The receptacle is connected and fixed to a ground circuit on a substrate surface, and has a rectangular tubular receptacle body that detachably fits the plug body and prevents the plug body from coming off. And a spring-type contact pin connected to and fixed to a signal circuit on the board surface and arranged inside the receptacle main body. The tip of the spring-type contact pin is connected with the plug main body and the receptacle main body, A coaxial connector characterized by making elastic contact with a contact block from a vertical direction. 3. An engaging projection is provided on a plug portion of the plug body.
At the same time as projecting, the plug
When the main body is attached, the engagement hole into which the engagement protrusion fits is formed.
Coaxial connector according to claim 1, wherein in that form.