JP2007109420A - Connector with shield - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connector with a shield short in total length of the connector itself and reusable after a flexible board is inserted into and extracted from it. <P>SOLUTION: This connector 4 for a flexible board 3 composed by arranging a plurality of conductors 2f side by side on one surface of a tip part 3a and by forming a shield film 10b on the other surface thereof is provided with: a terminal 40 having a contact part 40a for contacting the conductors 2f; a shield plate 42bu arranged at a predetermined distance from the contact part 40a of the terminal 40 for contacting the shield film 10b; and a reception part 4a formed between the shield plate 42bu and the contact part 40a and allowing the tip part 3a of the board 3 to be inserted therein. When the tip part 3a of the board 3 is inserted into the reception part 4a, the terminal 40 is elastically deformed by contact of the conductors 2f to the contact part 40a, and the shield film 10b is brought into press contact with the shield plate 42bu by its restoration force. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shielded connector. Particularly, as a countermeasure against high-frequency noise, the FPC (flexible printed circuit) and FFC (flexible flat cable) which are shielded with a shielding film are used for non-flexible substrates. -It relates to a ZIF type shielded connector.

  As the amount of information processed by various electronic devices increases, the need to take countermeasures against high-frequency noise is becoming stronger, and flexible devices such as FPC and FFC that play the role of information transmission within the devices. It is known that the effect can be obtained by shielding the substrate and the connector to which it is connected by coating a shield film or covering the periphery with a metal plate.

  For example, Patent Document 1 discloses that a signal line arranged in parallel with a predetermined interval on one surface of a flexible insulating plate, an auxiliary conductor (GND line) disposed between the signal lines, and the insulating plate. As a shielded connector for a flexible board having a ground portion disposed on the other surface and a portion for conducting the ground portion and the GND line, a shield plate covering substantially the entire surface of the connector, and the signal line A correspondingly arranged signal terminal, a ground terminal arranged corresponding to the GND line and in contact with the shield plate, the signal terminal is pressed against the signal line, and the ground terminal is connected to the GND line. A structure with a slider for pressing is described.

  According to the present invention, since the ground portion is arranged on the flexible substrate, the connector is covered with the shield plate, and the three components of the ground portion, the shield plate, and the ground terminal can be accurately connected. As expected, the expected effect can be expected.

JP 2003-168523 A

  However, in such a connector, it is necessary to alternately arrange the signal terminal and the GND terminal in the connector housing so as to correspond to a plurality of signal lines and GND lines arranged alternately on the flexible substrate. Therefore, the total length of the connector becomes long.

  Further, when each GND terminal of the connector is pressed against each GND line of the flexible substrate by the slider, since the areas of the pressing member (GND terminal) and the pressed member (GND line) are both small, the GND terminal is connected to the GND line. There is a concern that the GND line may be peeled off from the flexible substrate. For this reason, the flexible board once inserted in the connector and then removed cannot be reused.

  In addition, the flexible substrate requires a portion for conducting the GND line disposed on one surface of the substrate with the ground portion disposed on the other surface, and therefore must be a flexible substrate having a special shape and structure. There is a problem that it is not obtained and becomes expensive.

  The object of the present invention created in view of the above circumstances is to provide a shielded connector that has a short overall connector length and can be reused after a flexible board is inserted and removed.

  To achieve the above object, the present invention provides a connector for a flexible substrate in which a plurality of conductors are arranged in parallel on one surface of a tip portion and a shield film is provided on the other surface, and the contact for contacting the conductors. A terminal having a portion, a shield plate disposed at a predetermined interval from the contact portion of the terminal, and contacting the shield film; and formed between the shield plate and the contact portion; A receiving portion into which the portion can be inserted, and when the leading end portion of the flexible substrate is inserted into the receiving portion, the terminal is elastically deformed by the contact of the conductor with the contact portion, and the restoring force causes the shielding. The film is pressed against the shield plate.

  The housing has a housing in which the terminal is implanted, and the housing has a rear wall on which the contact portion of the terminal is disposed, and a front surface formed lower than the position of the contact portion so as to face the rear wall. The shield plate is disposed so as to cover the front wall, the upper part thereof, and the rear wall, and the receiving part is formed between the shield plate above the front wall and the contact part. May be.

  A leg portion connected to the ground portion of the circuit board may be formed on the shield plate.

  According to the shielded connector according to the present invention, the total length of the connector is short, and an effect that the connector can be reused after inserting and removing the flexible substrate can be exhibited.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  First, the flexible substrate inserted into and extracted from the shielded connector according to the present embodiment will be described.

  As shown in FIGS. 4 and 5, the flexible substrate 3 includes a flexible substrate body 2 and a reinforcing plate 1. The flexible substrate body 2 includes a pair of base films 2g and 2g made of an insulating material such as polyester, a plurality of conductors 2f (for signals) sandwiched between them and arranged at intervals in the width direction, The base film 2g has a shield film 2h made of a conductive metal film (copper, aluminum, or the like) coated on the surface of the base film 2g. The other base film 2g is removed at the tip thereof, and the conductor 2f is removed. Exposed. The conductor 2f makes elastic contact with the contact portion 40a of the terminal 40 of the connector 4 (FIG. 1).

  The reinforcing plate 1 is attached to the surface 2b of the tip 2a of the flexible substrate body 2 on the side coated with the shield film 2h with a conductive adhesive, whereby the flexible substrate 3 is configured. The reinforcing plate 1 has a reinforcing plate main body 1a made of a material such as polyethylene terephthalate that has appropriate rigidity and flexibility, and the main body 1a is formed in a flat plate shape in accordance with the width of the flexible substrate main body 2. A fixing portion 1b that is fixed to a portion 2c on the front side in the insertion direction of the one side surface 2b of the flexible substrate body 2, and a non-fixing portion 1c that is not fixed to the portion 2d on the rear side in the insertion direction of the one side surface 2b. Have. The fixed portion 1b is inserted into the receiving portion 4a of the connector 4 together with the flexible substrate body 2, whereas the non-fixed portion 1c protrudes from the receiving portion 4a (FIG. 1).

  The reinforcing plate 1 has another shield film 10 coated on the surface of the fixing portion 1b. The shielding film 10 is made of a conductive material such as copper or aluminum, and is in front of the fixing portion 1b (flexible substrate body 2). The front shield film 10a formed on the surface of the fixed portion 1b, the back shield film 10b formed on the back surface of the fixed portion 1b, and the front shield film formed so as to wrap around the widthwise end of the fixed portion 1b. 10a and a side shield film 10c connecting the back shield film 10b. The portion of the front shield film 10a of the reinforcing plate 1 is bonded and fixed to the portion of the shield film 2h of the flexible substrate body 2 with a conductive adhesive, so that the shield film 2h is made of the conductive adhesive, the front shield film 10a and the side. The back shield film 10b is electrically connected through the partial shield film 10c. The back shield film 10b corresponds to a shield film in the claims.

  The reinforcing plate 1 has a cover 1d formed at the insertion tip of the reinforcing plate body 1a so as to cover the insertion tip surface 2e of the flexible substrate body 2. The cover 1d is an insertion tip surface of the flexible substrate body 2. 2e has an abutting surface 1e against which the abutting surface 1e is set to have a dimension at least equal to or greater than the thickness of the insertion tip surface 2e. Further, the cover 1d has a nose portion 1f made of a tapered surface and / or an arc that is formed in a tapered shape and is positioned below the abutting surface 1e. The nose portion 1 f is to prevent catching when the reinforcing plate 1 is inserted into the connector 4.

  Next, the shielded connector 4 into which the tip portion 3a of the flexible substrate 3 described above (the portion where the fixing portion 1b of the reinforcing plate 1 and the flexible substrate body 2 are laminated) is inserted and removed is described with reference to FIGS. explain.

  As shown in FIG. 1, the connector 4 includes a terminal 40 having a contact portion 40a for making contact with the conductor 2f, and a shield for making contact with the back shield film 10b arranged at a predetermined interval from the contact portion 40a. A plate 42 and a receiving portion 4a formed between the shield plate 42 and the contact portion 40a and into which the tip portion 3a of the flexible substrate 3 can be inserted.

  The shield plate 42 is spaced a predetermined distance from the contact portion 40a in a direction perpendicular to the tip portion 3a inserted into the receiving portion 4a. The predetermined interval is such that when the tip portion 3a is inserted into the receiving portion 4a, the conductor 2f comes into contact with the contact portion 40a, whereby the terminal 40 is elastically deformed, and the back shield film 10b is applied to the shield plate 42 by the restoring force. It is set to be pressed by force.

  1 to 3, the connector 4 includes a housing 41 made of an insulating material such as PPS (polyphenylene sulfide), and the housing 41 has a rear wall 41a on which the contact portion 40a of the terminal 40 is disposed. And a front wall 41b formed lower than the position of the contact portion 40a so as to face the rear wall 41a, and a side wall 41c connecting the front wall 41b and the rear wall 41a.

  The shield plate 42 is disposed so as to cover the front wall 41b, the upper side, the rear wall 41a and the side wall 41c, and between the shield plate 42bu above the front wall 41b and the contact portion 40a of the terminal 40, A receiving portion 4a for inserting and removing the distal end portion 3a of the flexible substrate 3 is formed.

  The shield plate 42 includes a rear wall shield plate 42a that is in close contact with the outside of the rear wall 41a, a front wall shield plate 42b that is in close contact with the outside of the front wall 41b, and a side wall shield plate 42c that is in close contact with the side wall portion 41c. Become. The side wall shield plate 42c connects the rear wall shield plate 42a and the front wall shield plate 42b. Each of these shield plates 42a to 42c is formed by punching a metal plate, connected by a locking hook 42d, and mounted on a circuit board (not shown) via a leg portion 42e provided on the front wall shield plate 42b. Grounded.

  The front wall shield plate 42b is bent at a substantially right angle from the upper end of the lower front wall shield plate 42bl formed so as to cover the outer side of the front wall 41b of the housing 41 to the rear wall 41a side from the upper end of the lower front wall shield plate 42bl. The upper front wall shield plate 42bu is bent again at a substantially right angle so as to be separated from the contact portion 40a by a predetermined distance (described above) and extended upward to substantially the same height as the upper end of the rear wall shield plate 42a. Thereby, the receiving part 4a in which the front-end | tip part 3a of the flexible substrate 3 is inserted is formed between the upper front wall shield plate 42bu and the contact part 40a (rear wall 41a).

  A plurality of the terminals 40 are arranged at predetermined intervals in the longitudinal direction of the connector 4 so as to correspond to the conductor 2f, and are press-fitted into a press-fit groove 41d formed between the rear wall 41a and the front wall 41b. A press-fit portion 40b, a contact portion 40a elastically contacted with the conductor 2f of the flexible substrate body 2, and a tail portion 40c soldered to the circuit board.

  As shown in FIGS. 2 and 3, the upper front wall shield plate 42 bu is formed with a plate portion 42 f extending upward, and the claw portion 42 g as the engaging portion 5 is cut on the plate portion 42 f. It is formed by being awakened. On the other hand, a window portion 1 g is opened as the engaged portion 6 in the non-fixed portion 1 c of the reinforcing plate 1.

  Thereby, when the front-end | tip part 3a of the flexible substrate 3 is inserted in the receiving part 4a of the connector 4, the non-adhering part 1c of the reinforcement board 1 rides on the nail | claw part 42g, elastically deforms, and the window part 1g becomes the nail | claw part 42g. Engage with. When the non-fixed portion 1c rides on the claw portion 42g, the claw portion 42g is also slightly elastically deformed. Moreover, after engaging in this way, the window part 1g can be made to detach | leave from the nail | claw part 42g by distorting the non-adhesion part 1c of the reinforcement board 1 to the side by which the flexible substrate main body 2 was mounted | worn. .

  The operation of this embodiment will be described.

  As shown in FIG. 1, when the distal end portion 3a of the flexible substrate 3 is inserted into the receiving portion 4a of the connector 4, the conductor 2f comes into contact with the contact portion 40a of the terminal 40, and the terminal 40 is elastically deformed rightward in the figure, Since the back shield film 10b is pressed against the upper front wall shield plate 42bu with a predetermined force by the restoring force, a high shielding effect is exhibited. That is, the shield film 2h of the flexible substrate body 2 is grounded to the circuit board through the conductive adhesive, the front shield film 10a, the side shield film 10c, the back shield film 10b, the upper front wall shield plate 42bu, and the legs 42e. Therefore, the noise that has jumped into the shield film 2h can be reliably released from the leg portion 42e to the circuit board. If the reinforcing plate body 1a is made of metal, the shield film 10 can be omitted.

  The housing 41 has a short front wall 41b, and accordingly, the front wall shield plate 42b is composed of a lower front wall shield plate 42bl and an upper front wall shield plate 42bu. The receiving portion 4a is defined by the upper front wall shield plate 42bu and the contact portion 40a of the terminal 40. Therefore, when the distal end portion 3a of the flexible substrate 3 is inserted into the receiving portion 4a, the shield film 10 of the reinforcing plate 1 conducted to the shield film 2h of the flexible substrate body 2 is directly applied to the upper front wall shield plate 42bu. In contact therewith, the circuit board is grounded via the leg part 42e of the shield plate 42.

  If the front wall 41b of the housing 41 is the same height as the rear wall 41a, the housing 41 is interposed between the upper front wall shield plate 42bu and the contact portion 40a of the terminal 40. Thus, the shield film 10 cannot be in direct contact with the upper front wall shield plate 42bu. Therefore, as in the above Patent Document 1 (Japanese Patent Laid-Open No. 2003-168523), a ground terminal is prepared in parallel with the terminal 40. Then, the shield film 10 must be brought into pressure contact therewith and grounded therefrom, and the length of the connector 4 is increased by the amount of the ground terminal, which goes against the market needs for downsizing. When compared with this, the connector 4 of this embodiment can shorten the overall length.

  Further, when the flexible substrate 3 is inserted into the connector 4, the back shield film 10b having a large area is pressed against the upper front wall shield plate 42bu having the same large area, so that pressure concentration does not occur, and the back shield film 10b does not peel from the reinforcing plate 1. Therefore, after the flexible substrate 3 is once inserted into and removed from the connector 4, the flexible substrate 3 can be reused. Since the shield film 2h having a large area is attached to the front shield film 10a having the same large area with a conductive adhesive, pressure concentration does not occur in these films, and the shield film 2h is formed by the flexible substrate body 2. There is no peeling from.

  In addition, an existing one can be used for the flexible substrate body 2, and a design change is not required unlike the one described in Patent Document 1. In the case of the one described in Document 1, the cost of the ground terminal and the signal terminal is the same, and the cost is saved. However, as a result, the ground conductor must be conducted on the same surface as the signal conductor, resulting in a significant change in the flexible substrate. It is. Further, in this embodiment, it is not necessary to prepare a ground terminal, and the inexpensive connector 4 can be obtained because there is no housing 41 above the front wall 41b.

  In addition, when a ground terminal is used as described in Document 1, the flexible substrate can be grounded only from the terminal, but in this embodiment, the back shield film 10b and the upper front wall shield plate 42bu are in surface contact. Since the back shield film 10b and the shield film 2h are electrically connected, the entire surface of the flexible substrate body 2 can be easily grounded, and the effect of countermeasures against high frequency noise can be remarkably improved.

  The present invention is not limited to the above embodiment.

  For example, if the upper front wall shield plate 42bu is provided with ribs along the longitudinal direction of the connector 4 or the direction orthogonal thereto, the rigidity of the shield plate 42 can be increased. When the back shield film 10b is pressed against the upper front wall shield plate 42bu and inserted into the receiving portion 4a, the shield plate 42bu is difficult to bend. Therefore, the conductor 2f of the flexible substrate body 2 can be strongly pressed against the contact portion 40a.

  Further, the reinforcing plate 1 constituting a part of the flexible substrate 3 can be omitted. In this case, the flexible substrate body 2 itself forms a flexible substrate, the tip portion 2 a of the substrate body 2 is inserted into and removed from the connector 4, and the distance between the contact portion 40 a of the terminal 40 and the shield plate 42 bu is determined by the substrate body 2. It is narrowed according to the thickness of the tip portion 2a.

  Further, the retaining structure (engagement portion 5 and engaged portion 6) of the flexible substrate 3 may be omitted.

It is a cross-sectional perspective view which shows a mode that the front-end | tip part of the flexible substrate was inserted in the connector with a shield which concerns on one Embodiment of this invention. FIG. 2 is an overall view of FIG. 1. It is the perspective view which looked at FIG. 2 from the other side. It is a perspective view of the said flexible substrate. It is the VV sectional view taken on the line of FIG.

Explanation of symbols

2f Conductor 3 Flexible substrate 3a Tip 4 Connector 4a Receiving part 10b Shield film (back shield film)
40 terminal 40a contact part 41 housing 41a rear wall 41b front wall 42bu shield plate (upper front wall shield plate)
42e Leg

Claims (3)

A connector for a flexible board in which a plurality of conductors are arranged in parallel on one surface of the tip portion and a shield film is provided on the other surface,
A terminal having a contact portion for making contact with the conductor; a shield plate disposed at a predetermined interval from the contact portion of the terminal; for contacting the shield film; and between the shield plate and the contact portion. And a receiving portion into which the tip portion of the flexible substrate can be inserted,
When the tip of the flexible substrate is inserted into the receiving part, the terminal is elastically deformed by the conductor coming into contact with the contact part, and the shield film is pressed against the shield plate by its restoring force. A shielded connector characterized by A housing in which the terminal is implanted;
The housing has a rear wall on which the contact portion of the terminal is disposed, and a front wall formed lower than the position of the contact portion so as to face the rear wall,
The shield according to claim 1, wherein the shield plate is disposed so as to cover the front wall, the upper portion thereof, and the rear wall, and the receiving portion is formed between the shield plate above the front wall and the contact portion. With connector. The shielded connector according to claim 1 or 2, wherein a leg portion connected to a ground portion of the circuit board is formed on the shield plate.

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