JP2002093528A - Connector for flat cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat cable connector having higher shield ability. SOLUTION: A plug 20 connected to a terminal of a flat cable 10 is insertion- coupled with a receptacle 70 attached on a circuit board. A cable side terminal fitting 23 connected individually with a core wire of each shield wire 11 is set out in parallel in a cable side housing 21 of the plug 20, and at the same time, a shield shell 50 connected over a shield layer of each shield wire 11 is arranged under cover. A ground terminal 67 is protruded and set from a front edge of the shield shell 50, and set between the cable side terminal fittings 23. A board-side terminal fitting 73 connectable with the cable-side terminal fitting 23 is set out in a board-side casing 71 of the receptacle 70, and also, a connection terminal 74 connectable with the ground terminal 67 is set out in parallel between them, and this connection terminal 74 is connected with an earth circuit on the circuit board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector used by connecting a plurality of shielded electric wires to a terminal of a flat cable formed in parallel.

[0002]

2. Description of the Related Art Conventionally, the following types of flat cable connectors are known. This has a housing attached to the circuit board, and inside this housing, terminal fittings that can be individually connected to the core wire of each shielded wire constituting the flat cable are mounted side by side, and a conductive path on the circuit board is provided. A shield shell that is connected and can be connected over the shield layer of each shielded electric wire so as to cover the housing is provided, and connection portions protruding from both sides of the shield shell in the parallel direction of the terminal fittings are provided on the circuit board. Connected to the upper ground circuit.

When the terminal of the flat cable is connected to such a connector, individual signal lines are formed over the core wire of each shielded wire and the corresponding conductive path on the circuit board, and each shielded wire is connected via a shield shell. , A common ground is taken, and a shielding effect such as removal of radiated noise by a shield shell is obtained. Such a connector is described, for example, in Japanese Patent Application Laid-Open No. 10-255921.

[0004]

However, in the conventional connector, the shielding capability for removing noise may be insufficient depending on the purpose of use, and further improvement has been desired. The present invention has been completed based on the above-mentioned demands, and an object of the present invention is to further enhance the shielding ability.

[0005]

According to a first aspect of the present invention, a flat cable having a plurality of shielded wires connected in parallel is connected to a circuit board. A cable-side housing in which a cable-side terminal fitting individually connected to a core wire of each of the shielded wires is arranged side by side, and a shield shell connected over a shield layer of each of the shielded wires is provided. A board-side housing provided on the circuit board so as to be fitted to the cable-side housing, and a board-side terminal fitting connected to a conductive path on the circuit board and connectable to the cable-side terminal fitting. In the shield shell, a plurality of ground terminals are protruded from the shield shell and are disposed at positions between the cable-side terminal fittings. Together, the substrate housing has characterized in that said ground terminal and connectable connection terminals are connected to ground circuitry on the circuit board has a structure that is mounted.

According to a second aspect of the present invention, in the first aspect, the ground terminal is formed by bending a tongue piece integrally formed from an edge of the shield shell. Has features. According to a third aspect of the present invention, in the first or second aspect, a shield shell connected to an earth circuit on the circuit board is also covered by the board-side housing. Have.

[0007]

When the two housings are fitted, the ground terminal protruding from the shield shell is connected to the ground terminal of the circuit board via the connection terminal mounted on the board side housing. Connected to. Since multiple ground terminals are arranged between the cable side terminal fittings and connected to the earth circuit, the current flowing from the shielded wire to the shield shell flows in the opposite direction of the signal current to the back of the shield shell over a wide range. As a result, noise can be canceled over a wide range, that is, the shielding ability is enhanced. In addition, since the ground terminal is disposed between the cable-side terminal fittings, no extra space is required particularly in the thickness direction of the cable-side housing, which can contribute to miniaturization.

<Invention of Claim 2> The structure of the shield shell including the ground terminal is simple and easy to manufacture. <Invention of Claim 3> The noise removing ability can be exerted over a wider range at the terminal portion of the flat cable.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. In this embodiment, as shown in FIG. 1, a cable-side connector 20 (hereinafter, referred to as a plug) attached to a terminal of the flat cable 10, and a board-side connector 70 (hereinafter, referred to as a plug) fixed to a circuit board 90 (FIG. 6, etc.). , A receptacle). Note that the plug 20 and the receptacle 70 will be described with the respective mating surfaces being front surfaces.

As shown in FIG. 2, the flat cable 10 has a plurality of (six in the illustration) shielded wires 11 arranged in parallel at predetermined intervals, covered with a film (not shown), and formed in a strip shape. The short-circuit body 16 is fixed over the shield layer 14 (FIG. 6) of each shielded electric wire 11. At the end of each shielded wire 11, the inner coating 13 is exposed over a predetermined dimension, and the core wire 12 is further peeled off at each intermediate position to expose the core wire 12.
Are connected by the alignment sheet 17 so that the core wires 12 are also maintained in a parallel state with a predetermined interval.

As shown in FIG. 2, the plug 20 includes a cable-side housing 21, six cable-side terminal fittings 23 mounted on the cable-side housing 21, and upper and lower shield plates 51 and 52.
It is composed of These upper and lower shield plates 51, 5
2 constitutes a first shield shell 50 corresponding to the shield shell of the present invention. The cable-side terminal fitting 23 is a press-contact type terminal fitting, and as shown in FIG. 3, a contact portion 24 which is formed one step higher from the distal end side, and a press-fitting portion 25 which projects laterally, Pressing part 2
6 are provided. Specifically, the press contact portion 26 is bifurcated and extends rearward, and then has a rear end bent upward. The bent portion 27 is provided with a press contact groove 28 for press-contacting the core wire 12 of the shielded electric wire 11. I have.

The cable-side housing 21 is formed of a synthetic resin material in the shape of a thick plate having a planar rectangular shape, and has a pair of fitting arms 30 protruding from front ends of left and right side edges thereof. In the first half of the cable side housing 21,
The mounting area of the cable-side terminal fitting 23 is set.
The terminal mounting area 31 is formed with six terminal insertion grooves 32 shown in the drawing, into which the above-mentioned cable-side terminal fittings 23 can be inserted, at intervals in the horizontal width direction. The distal end of each terminal insertion groove 32 is formed of a pair of protection pieces 34 that cover both left and right sides of the contact portion 24 of the cable-side terminal fitting 23. Between the pair of protective pieces 34, five illustrated receiving grooves 35 for receiving a ground terminal 67 described later are formed.

Immediately after the position where the protection piece 34 is formed, a front ridge 37 is formed across the entire terminal insertion groove 32. The reaching press-fit hole 38 is formed. This press-fit hole 38
Has a stepped shape in which a wide portion 38A into which the press-fit portion 25 of the cable-side terminal fitting 23 can be inserted from above is formed at the center in the front-rear direction, and a narrow portion 38B is formed behind the wide portion 38A. On the other hand, a rear ridge 40 is formed at the rear end of the terminal mounting area 31 so as to cross the entire terminal insertion groove 32, and inside the ridge 40, the bending at the press-contact portion 26 of each cable-side terminal fitting 23 is formed. A hollow hole 41 is formed to allow each of the portions 27 to be inserted from the front. The core wire 12 of the shielded electric wire 11 is provided on the ceiling surface of each hollow 41.
Is formed in the front-rear direction slit 42 through which the slits can be inserted.

Accordingly, the cable-side terminal fitting 23 is inserted from above into the corresponding terminal insertion groove 32 in such a manner that the press-fitting portion 25 is aligned with the wide portion 38A of the press-fitting hole 38, and is then pushed rearward. It is fixed by biting into the stepped portion with the narrow portion 38B. At this time, the contact portion 24 of the cable-side terminal fitting 23 fits between the pair of protection pieces 34 and the bent portion 27 of the press-contact portion 26 has the hollow 41.
And the press contact groove 28 is aligned immediately below the slit 42.

On the other hand, a terminal mounting area of the flat cable 10 is set in the rear half of the cable-side housing 21 so as to overlap with the rear end of the terminal mounting area 31. At the rear edge of the cable mounting area 44, a partition column 45 for partitioning and arranging each shielded wire 11 of the flat cable 10 is provided. 1
Positioning groove 46 for partitioning and wiring the exposed portion 3
Are formed. A portion where the positioning groove 46 is formed;
A flat cable 10 is provided between the juxtaposed portions of the partition columns 45.
A first accommodating surface 47 capable of accommodating the short-circuit body 16 is formed over substantially the entire width, and the rear ridge 40
The core wire 1 of the shielded electric wire 11 is
2 can be inserted from above. In addition, a second housing surface 48 is provided substantially over the entire width at a position rearward of the front protruding ridge 37 which is a front end portion of the cable mounting area 44, and the cable side terminal on which the alignment sheet 17 of the flat cable 10 is mounted first. It can be accommodated so as to overlap across the bracket 23 group.

Next, the first shield shell 50 will be described. The lower shield plate 51 is, as shown in FIG.
The cable-side housing 21 is formed in a shape that can be mounted so as to cover the left and right side surfaces from the bottom surface. The lower shield plate 51 hooks a hook 53 formed on a rear edge of the substrate 51A between partition columns 45 on a rear edge of the cable-side housing 21 and is fitted by a pressing plate 55 formed on an upper end of a side plate 54. The arm 30 is attached to the cable-side housing 21 by pressing the upper surface thereof.

At a position near the rear end of the substrate 51A in the lower shield plate 51, the short-circuit
The contact piece 56 that contacts the lower surface of the short-circuit body 16 is formed on the left and right sides thereof. It is provided so as to penetrate the upper surface. On the other hand, the front and rear two
A locking groove 58 is formed at the location, and both side plates 5
A lock projection 59 for locking between a second shield shell 85 provided on a receptacle 70 described later is provided at a position near the front end of the side surface of the side 4 so as to be elastically movable through a window hole 60. ing.

The upper shield plate 52 is, as shown in FIG.
From the rear edge of the cable side housing 21 to the front protrusion 3
7 is formed to cover the upper surface up to the formation position.
The upper shield plate 52 is provided at two places in front of and behind the left and right side edges.
Locking claws 62 inserted into the locking grooves 58 of the lower shield plate 51 are formed. Upper shield plate 52
On the rear end side, two right and left contact pieces 63 that are in contact with the upper surface of the short-circuit body 16 of the flat cable 10 are similarly cut obliquely and formed. Also, in front of the contact piece 63,
Pressing portions 64 and 65 for pressing the front and rear sides of the core wire 12 of the shielded wire 11 sandwiching the press-contact portion of the core wire 12 are respectively formed in recesses.

The upper shield plate 52 is integrally assembled to the lower shield plate 51 by inserting the respective locking claws 62 into the corresponding locking grooves 58, and is formed into a flat cylindrical shape by the both shield plates 51, 52. 1 shield shell 50 is formed,
The cable side housing 21 is mounted so as to cover the upper and lower surfaces and the left and right surfaces. And the upper shield plate 5
Five tongues are protruded from the front edge of FIG. 2, and each of the tongues is bent so that a root portion is bent downward and then extends forward to form a ground terminal 67. Have been. When the upper shield plate 52 is properly assembled to the lower shield plate 51 as described above, the ground terminal 67 is provided in each accommodation groove 35 between the pair of protection pieces 34 in the cable-side housing 21. The side terminal fitting 23 is accommodated at the same height as the contact portion 24.

Further, the structure of the receptacle 70 is shown in FIG.
The receptacle 70 described with reference to FIG. 6 and FIG.
It comprises a board-side housing 71, six board-side terminal fittings 73 shown in the drawing, and five connection terminals 74 shown in the figure, and a second shield shell 85. The board-side terminal fitting 73 and the connection terminal 74 are formed in the same shape, a forked portion 75 is formed on the front end side (the right side in FIGS. 6 and 8), and the conductive end of the circuit board 90 is formed on the rear end. A mounting portion 76 is formed which is connected to a road or a ground circuit.

The board-side housing 71 is shorter in the front-rear direction than the above-mentioned cable-side housing 21, and is formed in a slightly wide thick plate shape. On the front surface (the right side in FIGS. 6 and 8) of the board-side housing 71, a fitting hole 79 into which the fitting arm 30 of the cable-side housing 21 can be fitted is opened at both ends in the width direction. In the meantime, a fitting groove 80 is formed in which a portion of the front edge of the cable-side housing 21 where the protection piece 34 is formed can be fitted. On the other hand, on the rear surface of the board-side housing 71, eleven mounting grooves 81 shown in the drawing and opening in the fitting grooves 80 in a slit shape are provided.
They are formed side by side in the width direction at a constant pitch.

One of the mounting grooves 81 starts from one end and
The permanent holder is a mounting groove 81 for the substrate-side terminal fitting 73, and the space between them is a mounting groove 81 for the connection terminal 74. The board-side terminal fittings 73 and the connection terminals 74 are inserted into the corresponding mounting grooves 81 from the rear, and the press-fit portions 77 are inserted into the mounting grooves 8.
The two forked portions 75 protrude into the fitting grooves 80, respectively, and the mounting portions 76 protrude rearward from the rear edge of the board-side housing 71.

The second shield shell 85 on the receptacle 70 side is formed in a flat box shape that is opened substantially on both front and rear surfaces, and is mounted so as to cover the upper, lower, left and right surfaces of the board-side housing 71. . At the left and right end portions of the upper surface of the second shield shell 85, two right and left contact pieces 86 that are in contact with the holding plate 55 of the lower shield plate 51 on the plug 20 side are cut and raised obliquely. From the rear edge and the left and right side surfaces of the second shield shell 85, mounting pieces 87 which are soldered and mounted to the circuit board 90 are provided in a protruding manner. The attachment piece 87 is connected to an earth circuit on the circuit board 90 so as to function as a ground portion. From the front edges of the left and right side surfaces of the second shield shell 85, connecting pieces 88 are provided so as to extend along the outside of the fitting arm 30 of the cable-side housing 21. Is opened.

Next, the operation of the present embodiment will be described. In the plug 20, as shown in FIG. 2, the cable-side terminal fittings 23 are inserted into the respective terminal insertion grooves 32 of the cable-side housing 21, and the lower shield plate 51 is mounted.
Subsequently, the terminal of the flat cable 10 is indicated by an arrow A in FIG.
As shown in (2), the cable is mounted on the cable mounting area 44 of the cable side housing 21 from above. Along with this, the core wire 12 of each shielded electric wire 11 passes through the corresponding slit 42 of the rear ridge 40 and is pressed into the press-contact groove 28 of the cable-side terminal fitting 23 (see FIG. 6). Thereby, each shielded electric wire 11 and the cable side terminal fitting 23 are connected. As shown in FIG. 5, the short-circuit body 16 of the flat cable 10 is attached in a locking state by a hook 57.

Next, an upper shield plate 52 is attached from above as shown by the arrow B in FIG. 2, and is integrally assembled to the lower shield plate 51 as shown in FIG. Cover the cable side housing 21. At this time, as shown in FIG. 6, the front and rear portions of the press-contact portion of the core wire 12 in each shielded electric wire 11 are pressed by the pressing portions 64 and 65 to be kept in the press-contact state. Further, the short-circuit body 16 is elastically held between the contact pieces 56 and 63 of the upper and lower shield plates 51 and 52, and
Is electrically connected to the first shield shell 50. Further, the ground terminals 67 provided on the front edge of the upper shield plate 52 are accommodated in the corresponding accommodation grooves 35, and are arranged side by side at positions between the contact portions 24 of the respective cable-side terminal fittings 23.

On the other hand, in the receptacle 70, the board-side terminal fittings 73 and the connection terminals 74 are alternately inserted into the mounting grooves 81 of the board-side housing 71, and the second shield shell 85 is attached so as to cover the board-side housing 71. Can be Such a receptacle 70 is arranged at a predetermined position on the circuit board 90, and four mounting pieces 87 are fixed and connected to an earth circuit formed on the circuit board 90 by soldering. At the same time, each board-side terminal fitting 73
Are fixed and connected by soldering to the corresponding conductive paths formed on the circuit board 90, while the mounting sections 76 of the connection terminals 74 are also connected to the ground circuit formed between the conductive paths. , Also fixed and connected by soldering.

As shown by the arrow C in FIG. 1, the plug 20 is fitted into the receptacle 70, and the portion where the protection piece 34 of the cable-side housing 21 is formed fits into the fitting groove 80 of the board-side housing 71. It is inserted. When the plug 20 is fitted to the proper position, the lock projection 59 on the plug 20 side is elastically fitted into the lock hole 89 of the connecting piece 88 on the receptacle 70 side, and the plug 20 and the receptacle 70 are locked in the fitted state. Is done. At this time, the first and second shield shells 50 and 85 are connected back and forth, and are electrically connected to each other through the contact pieces 86.

The contact portion 2 of each cable-side terminal fitting 23
4, the corresponding board-side terminal fittings 73 as shown in FIG.
The two terminal portions 23 and 73 are connected to each other while the forked portion 75 is opened. At the same time, as shown in FIG. 9, the ground terminal 67 is inserted and connected between the fork portions 75 of the corresponding connection terminal 74 while opening the fork portion. As a result, individual signal lines are formed from the core wire 12 of each shielded wire 11 constituting the flat cable 10 to the corresponding conductive path on the circuit board 90 via the cable-side terminal fitting 23 and the board-side terminal fitting 73. At the same time, a common ground is taken from each of the shielded wires 11 from the short-circuit body 16 via the shield shells 50 and 85, and the shield shells 50 and 85 provide a shielding effect such as removal of radiation noise.

In the present embodiment, in particular, the first
In connecting the shield shell 50 to the ground circuit of the circuit board 90, a plurality of ground terminals 67 are provided over substantially the entire width of the front edge of the first shield shell 50,
Similarly, since a structure is employed in which the connection is made to the ground circuit of the circuit board 90 via the connection terminals 74 mounted over substantially the entire width of the board-side housing 71, the current flowing from the shielded wire 11 to the first shield shell 50 is the signal current and the signal current. By flowing in a wide range in the opposite direction to the inside of the first shield shell 50, noise can be canceled over a wide range, that is, the shielding ability is enhanced. Moreover, since the ground terminals 67 are arranged between the cable-side terminal fittings 23 arranged side by side, no extra space is required in the thickness direction of the cable-side housing 21, and the size is reduced. Can be contributed to. Note that the present invention is not limited to the embodiment described with reference to the above description and drawings, and can be implemented with various modifications without departing from the scope of the invention.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state before a plug according to an embodiment of the present invention is fitted into a receptacle.

FIG. 2 is an exploded perspective view of a plug.

FIG. 3 is a perspective view of a cable-side terminal fitting.

FIG. 4 is a perspective view of a lower shield plate.

FIG. 5 is a perspective view showing a state where a flat cable terminal is attached.

FIG. 6 is a longitudinal sectional view before fitting at a mounting position of a cable-side terminal fitting.

FIG. 7 is a longitudinal sectional view after the fitting.

FIG. 8 is a longitudinal sectional view before fitting at a mounting position of a ground terminal.

FIG. 9 is a longitudinal sectional view after the fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Flat cable 11 ... Shield electric wire 12 ... Core wire 14 ... Shield layer 16 ... Short circuit body 20 ... Plug 21 ... Cable side housing 23 ... Cable side terminal fitting 24 ... Contact part 34 ... Protective piece 35 ... Housing groove 50 ... 1st shield Shell 52 ... Upper shield plate 67 ... Ground terminal 70 ... Receptacle 71 ... Board side housing 73 ... Board side terminal fitting 74 ... Connection terminal 85 ... Second shield shell 87 ... Mounting piece 90 ... Circuit board

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) HH28 HH30

Claims (3)

[Claims] 1. A connector for connecting a terminal of a flat cable formed by arranging a plurality of shielded wires in parallel to a circuit board, wherein a cable-side terminal fitting individually connected to a core wire of each of the shielded wires is provided. A cable-side housing, which is provided side by side and is covered by a shield shell connected over a shield layer of each of the shielded wires; and provided on the circuit board so as to be fittable with the cable-side housing. And a board-side housing in which board-side terminal fittings connectable to the cable-side terminal fittings are connected to the conductive path of the cable shell, and a plurality of ground terminals protrude from the shield shell. At the position between the cable-side terminal fittings, and the board-side housing is in contact with an earth circuit on the circuit board. Connector for a flat cable, characterized by that which it is attached is a connection terminal connectable to the ground terminal is. 2. The flat cable connector according to claim 1, wherein the ground terminal is formed by bending a tongue piece integrally formed from an edge of the shield shell. 3. The flat cable connector according to claim 1, wherein a shield shell connected to an earth circuit on the circuit board is also provided on the board side housing.