JP3685320B2 - Flat cable connector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connector used by connecting a plurality of shielded electric wires to a flat cable end in parallel.
[0002]
[Prior art]
Conventionally, the following are known as this type of flat cable connector. This has a housing attached to the circuit board, and in this housing, the core wire of each shielded electric wire constituting the flat cable and the terminal metal fittings that can be individually connected are mounted side by side and the conductive path on the circuit board. A shield shell that can be connected and can be connected across the shield layer of each shielded electric wire so as to cover the housing is provided, and the connection portions projecting on both sides in the parallel direction of the terminal fitting in this shield shell are circuit boards. Connected to the ground circuit above.
[0003]
When the terminal of the flat cable is connected to the connector, individual signal lines are formed across the core wires of the shielded wires and the corresponding conductive paths on the circuit board, and common from each shielded wire through the shield shell. A grounding effect is taken, and a shielding effect such as removal of radiation noise by a shield shell is obtained.
Such a connector is described in, for example, JP-A-10-255921.
[0004]
[Problems to be solved by the invention]
However, the conventional connector may lack the shielding ability for noise removal depending on the purpose of use, and further improvement has been desired.
The present invention has been completed on the basis of the above-mentioned demands, and an object of the present invention is to increase the shielding ability with a simple structure.
[0005]
[Means for Solving the Problems]
As means for achieving the above object, the invention of claim 1 is a connector used by connecting a plurality of shielded electric wires to a flat cable end in parallel, and a housing arranged on a circuit board Inside, a terminal fitting that can be individually connected to the core wire of each shielded electric wire is mounted side by side and connected to the conductive path on the circuit board, and the shield of each shielded electric wire is covered so as to cover the housing In the case where a shield shell that can be connected across layers is provided, a connection that is connected to the ground circuit on the circuit board on the surface of the shield shell on the side where the connection end of the terminal fitting to the conductive path is drawn out parts are provided, and the connecting portion, side-by-side position and the connection end of said conductive path of said terminal fitting, extending in the extending direction and the direction of the connection end Characterized in was a configuration that.
[0006]
The invention of claim 2 is characterized in that, in the invention of claim 1, the connecting portion is formed integrally with the shield shell.
According to a third aspect of the present invention, in the device according to the first or second aspect, the circuit board is disposed on a surface of the shield shell adjacent to a side from which a connection end of the terminal fitting with the conductive path is drawn. This is characterized in that another connection portion connected to the ground circuit is provided.
[0007]
[Action and effect of the invention]
<Invention of Claim 1>
When connecting the shield shell to the ground circuit of the circuit board, a connection part was provided on the surface where the connection end side of the terminal metal part and the conductive path was drawn, and this connection part was connected to the earth circuit. The noise removal capability is improved compared to the case where the connection portion with the ground circuit is provided on both sides in the parallel direction. This is presumably because the current flowing from the shielded wire to the shield shell flows to the back of the shield shell in the opposite direction to the signal current, so that noise can be canceled over a wide range.
[0008]
<Invention of Claim 2>
When the connector is attached to the circuit board by connecting the shield shell connection part to the ground circuit of the circuit board, the connection part is integrated with the shield shell so that the connector has excellent holding power. Become.
<Invention of Claim 3>
Since the current flows over a wider range on the shield shell, the noise removal capability is further enhanced. In addition, when the connection of the connection portion to the ground circuit is used for attaching the connector to the circuit board, the connector can be attached more stably with a good balance.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS.
In this embodiment, as shown in FIGS. 1 and 2, a cable-side connector 20 attached to the end of the flat cable 10, and a board-side connector 30 (corresponding to the connector of the present invention) fixed to the circuit board 50, It has.
As shown in FIG. 3, the flat cable 10 includes a plurality of shielded wires 11 arranged in parallel, covered with a film (not shown), and formed in a strip shape. The shield layer 12 of each shielded wire 11 (FIG. 2). ) Is short-circuited. Moreover, the core wire 13 is exposed and protruded from the end of each shielded electric wire 11, and is arranged in parallel with a predetermined interval.
[0010]
As shown in FIG. 2, the cable-side connector 20 includes a synthetic resin housing 21 having a horizontally long thick plate shape, and a holding plate made of the same synthetic resin disposed on the lower surface side of the housing so as to be opened and closed with a shaft 23 as a center. 22. On the lower surface on the front end side of the housing 21, positioning grooves 24 for fitting and positioning the core wire 13 of the shielded electric wire 11 are formed at a predetermined pitch. When the pressing plate 22 is closed, each core wire 13 is sandwiched and held between the pressing plate 22 in the corresponding positioning groove 24, and the proximal end side of the core wire 13 is exposed to the lower surface. An introduction groove 25 for introducing the terminal fitting 35 attached to the board-side connector 30 is cut in the lower surface of the tip portion of the holding plate 22 corresponding to each exposed position of the core wire 13.
[0011]
A metal upper shell 26 and a lower shell 27 are respectively mounted at the center position in the width direction on the rear end side of the housing 21 and the holding plate 22. Both the upper shell 26 and the lower shell 27 are formed in a hairpin shape in cross section, and the contact pieces 26A, 26B and the contact pieces 27A, 27B are obliquely bent in directions away from each other from the upper and lower surfaces. Has been. When the presser plate 22 is closed as described above, the short-circuit body 15 of the flat cable 10 is elastically sandwiched and held by the contact pieces 26A and 27A inside the upper shell 26 and the lower shell 27, respectively. An electrical connection is made. The contact piece 26B outside the upper shell 26 protrudes from the upper surface of the housing 21 and the contact piece 27B outside the lower shell 27 protrudes from the lower surface of the presser plate 22, respectively.
[0012]
The board-side connector 30 includes a housing 31 made of synthetic resin, a plurality of terminal fittings 35, and a shield shell 40 made of a metal plate, and is fitted into a mounting recess 51 cut out at one side edge of the circuit board 50. Arranged as described above.
The front surface of the housing 31 has an insertion groove 32 into which the front end side of the cable-side connector 20 can be inserted, and slit-shaped attachment grooves 33 are formed in parallel at a constant pitch along the width direction. A terminal fitting 35 is press-fitted into each mounting groove 33. The terminal fitting 35 is formed with bifurcated arm portions 36A and 36B on the front end side with a predetermined interval, and a mounting portion 37 to the circuit board 50 is formed at the rear end portion.
[0013]
The shield shell 40 is formed by bending a metal plate as described above, and includes a top plate 41, a bottom plate 42, and a side plate 43 that is bent at right angles from the left and right side edges on the rear end side of the top plate 41. And a small connecting plate 44 that connects the left and right side edges of the upper surface plate 41 and the lower surface plate 42, and is formed in a flat box shape that is substantially open on both front and rear surfaces. By covering the shield shell 40 on the housing 31, the upper and lower surfaces of the housing 31 and the area ahead are the upper surface plate 41 and the lower surface plate 42, the left and right side surfaces of the housing 31 are the side surface plates 43, and the housing 31 The portions on both sides of the rear region of the terminal fitting 35 are covered with the left and right connecting plates 44, respectively. The upper surface plate 41 is formed with a guide groove 46 into which the front-rear rib 28 formed on the upper surface of the rear end side of the housing 21 of the cable-side connector 20 can be inserted.
And from both the connection plates 44 of the shield shell 40, the connecting piece 48 is formed by being bent outward at a right angle at a position near the lower end on the inner side in the width direction. Both connection pieces 48 are connected to a ground circuit on the circuit board 50 and are formed at the same height as the attachment portion 37 of the terminal fitting 35.
[0014]
Then, the effect | action of this embodiment is demonstrated. In the cable-side connector 20, the end of the flat cable 10 is inserted between the housing 21 and the opened holding plate 22, and the holding plate 22 is closed, so that the core wire 13 of each shielded wire 11 is connected as described above. It is positioned and clamped in the corresponding positioning groove 24, and the base end portion is exposed on the lower surface. At the same time, the short-circuit body 15 is elastically held between the upper and lower shells 26 and 27 and is electrically connected.
[0015]
On the other hand, in the board-side connector 30, the terminal fittings 35 are mounted in the mounting grooves 33 of the housing 31, and the shield shell 40 is put around the housing 31. Such a board-side connector 30 is fitted into the mounting recess 51 of the circuit board 50, and the mounting part 37 of each terminal fitting 35 is fixed and connected to the corresponding conductive path formed on the circuit board 50 by soldering. . Further, the connecting piece 48 projecting from both the connecting plates 44 of the shield shell 40 is fixed and connected to an earth circuit similarly formed on the circuit board 50.
[0016]
Then, as shown by the arrow in FIG. 2, the cable side connector 20 is fitted to the board side connector 30. From the middle, the rib 28 is inserted into the guide groove 46 and guided straight, and the front end side of the cable-side connector 20 is inserted between the upper and lower arm portions 36A, 36B of each terminal fitting 35 while opening. As shown in FIG. 5, the pressing is stopped when it hits the inner end of the insertion groove 32, and at this time, the lower arm portion 36 </ b> B of each terminal fitting 35 is elastically pressed against the core wire 13 of the corresponding shielded electric wire 11. Contact is taken. Further, the contact pieces 26B, 27B outside the upper and lower shells 26, 27 in the cable side connector 20 are elastically contacted with the upper surface plate 41 and the lower surface plate 42 of the shield shell 40 of the board side connector 30, respectively.
[0017]
As a result, individual signal lines are formed across the core wires 13 of the shielded electric wires 11 constituting the flat cable 10 and the corresponding conductive paths on the circuit board 50, and the shells 26, 27 and the shield shell 40 are connected from the short-circuit body 15. Thus, a common ground is taken from each shielded electric wire 11 and a shielding effect such as removal of radiation noise by the shield shell 40 is obtained.
[0018]
In the present embodiment, when connecting the shield shell 40 to the ground circuit of the circuit board 50, the connection pieces 48 are provided at both ends of the rear surface from which the mounting portion 37 of the terminal fitting 35 is drawn, and the connection pieces 48 are connected to the ground circuit. In such a structure, for example, as in the comparative example shown in FIG. 10, the connection pieces 101 are provided on the left and right side surfaces of the shield shell 100 as in the conventional case, and this is connected to the circuit board 50. Experiments have confirmed that the noise removal capability (shield performance) has improved by about 3 dB compared to the case of connecting to the above ground circuit.
This is because the current flowing from the shielded electric wire 11 to the shield shell 40 (indicated by a broken line in FIG. 1) flows to the back of the shield shell 40 in the opposite direction to the signal current (solid line in the figure). This is probably because the noise can be canceled.
[0019]
Second Embodiment
6 and 7 show a second embodiment of the present invention. In the second embodiment, the connecting pieces for ground connection provided on the shield shell 40A are connected to the connecting pieces 48 projecting from the two connecting plates 44 shown in the first embodiment, and the left and right side plates 43 are provided. Another connecting piece 60 is formed to be bent at right angles outward from the lower edge, and is similarly fixed and connected to a ground circuit formed on the circuit board 50 by soldering.
About another structure, it is the same as that of the said 1st Embodiment, Comprising: The duplicate description is abbreviate | omitted by attaching | subjecting the same code | symbol about the site | part which has the same function.
[0020]
In the second embodiment, the noise removal capability is further enhanced by allowing the current to flow over a wider range on the shield shell 40A to the inner edge and toward the side edge. Compared with the comparative example of FIG. 10 described above, it was confirmed that the noise removal capability was improved by 4 to 10 dB.
In addition, since the connecting piece of the shield shell 40A placed on the housing 31 is soldered to the ground circuit of the circuit board 50, it functions in conjunction with attaching the board-side connector 30 to the circuit board 50. Since the connection pieces 48 and 60 are formed integrally with the shield shell 40A and are arranged on three of the four peripheral surfaces, the board-side connector 30 is firmly and stably balanced with respect to the circuit board 50. Can be attached.
[0021]
<Third Embodiment>
8 and 9 show a third embodiment of the present invention. In this 3rd Embodiment, another connection piece from the said 2nd Embodiment is provided.
That is, of the left and right side plates 43 bent from the upper surface plate 41 in the shield shell 40B, the lower end on the rear end side is cut away from the position where the connection piece 60 is formed, while the left and right side edges of the lower surface plate 42 A side plate 62 having a short height is raised from the rear end portion thereof, and an upper edge thereof is bent at a right angle outward, whereby another connection piece 63 is provided at the same height as the connection piece 60. The connection piece 63 is fixed and connected to the ground circuit on the circuit board 50 by soldering in addition to the connection piece 48 on the rear surface and the connection piece 60 on the side surface.
[0022]
In the third embodiment, the noise removal capability is further enhanced by allowing the current to flow over a wider range on the shield shell 40B. Compared with the comparative example of FIG. 10 described above, it was confirmed that the noise removal capability was improved by 5 to 15 dB.
Further, the holding force when the board-side connector 30 is attached to the circuit board 50 can be further strengthened.
[0023]
<Other embodiments>
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In each of the above embodiments, the connection piece is formed integrally with the shield shell. However, a connection portion provided separately from the shield shell may be attached and connected to the ground circuit of the circuit board.
[0024]
(2) When providing the connection portion with the earth circuit on the rear surface of the shield shell, the shield shell may be provided at the center in the width direction. Providing a connection portion at this position shortens the linear distance from the contact point of the shield shell to the cable-side connector shell, and is effective for noise removal. Moreover, you may make it provide a connection part over the whole rear surface of a shield shell.
(3) The present invention can be similarly applied to a type in which a flat cable terminal is directly connected to a board-side connector without using a cable-side connector.
[Brief description of the drawings]
FIG. 1 is a perspective view of a connector according to a first embodiment of the present invention before mating. FIG. 2 is a longitudinal sectional view of the connector. FIG. 3 is a perspective view of a flat cable. 5] Longitudinal cross-sectional view when connector mating is completed. [Fig. 6] Perspective view of the board-side connector of the second embodiment attached to the circuit board. [Fig. 7] Side view of the board-side connector. FIG. 9 is a perspective view of a board-side connector attached to a circuit board according to the embodiment. FIG. 9 is a side view of the board-side connector. FIG. 10 is a perspective view of a comparative example where the board-side connector is attached to a circuit board. ]
DESCRIPTION OF SYMBOLS 10 ... Flat cable 11 ... Shielded electric wire 12 ... Shield layer 13 ... Core wire 15 ... Short-circuit body 20 ... Cable side connector 30 ... Board side connector (connector)
31 ... Housing 35 ... Terminal fitting 37 ... Mounting portion 40 ... Shield shell 41 ... Top plate 42 ... Bottom plate 43 ... Side plate 44 ... Connecting plate 48 ... Connection piece (connection portion)
50 ... Circuit board 40A ... Shield shell 60 ... Connection piece (connection part)
40B ... Shield shell 63 ... Connection piece (connection part)

Claims (3)

A connector used by connecting a plurality of shielded electric wires in parallel to the end of a flat cable,
In the housing arranged on the circuit board, terminal fittings that can be individually connected to the core wires of the shielded wires are mounted side by side so as to be connected to the conductive paths on the circuit board and to cover the housing. In a shield shell that can be connected across the shield layer of each shielded wire,
A connection portion connected to the ground circuit on the circuit board is provided on the surface of the shield shell on the side where the connection end of the terminal fitting to the conductive path is drawn , and the connection portion is connected to the terminal fitting. A flat cable connector characterized by extending in the same direction as the extending direction of the connecting end at a position side by side with the connecting end of the conductive path .   The flat cable connector according to claim 1, wherein the connecting portion is formed integrally with the shield shell.   In the shield shell, another connection portion connected to the ground circuit on the circuit board is provided on a surface adjacent to a side from which a connection end of the terminal fitting with the conductive path is drawn. The flat cable connector according to claim 1 or 2.

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