JP5861610B2 - Waterproof connector with built-in noise filter - Google Patents

Description

  The present invention relates to a waterproof connector with a built-in noise filter.

  In order to remove noise, a noise removing component such as a capacitor is generally connected to a connector terminal used for electrical connection between wiring boards. In a connector part comprising a female connector having a plurality of through-holes corresponding to a plurality of pins of the male connector, an insulating sheet (sheet) on which a noise removing circuit and an insulating coating covering it are formed on the back surface of the connector housing A technology for removing noise by inserting a noise filter into a connector pin and electrically connecting the connector pin is disclosed (for example, see Patent Document 1).

JP 11-329609 A

  However, in such a conventional noise filter built-in connector, although the noise removal circuit is protected by an insulation coating, the insulation sheet on which the circuit is formed is exposed, and the circuit is caused by the adhesion of water. May short circuit, or there may be a short circuit between terminals.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to prevent the insulating sheet on which the noise removing circuit is formed and water from getting into the connector housing.

The noise filter built-in connector of the present invention is
A noise filter built-in waterproof connector that fits in a sealed state with the mating connector,
Terminal fittings,
A connector housing in which a hood portion opening forward and a storage chamber opening rearward are partitioned by a partition wall ;
A first rubber stopper provided on the front side of the partition wall and in close contact with the inner peripheral surface of the hood portion;
An insulating sheet disposed in the housing chamber and formed with a noise removing circuit;
And having a terminal insertion hole, covering the insulating sheet from behind, and a second rubber stopper accommodated in the accommodation chamber,
The second rubber stopper is in close contact with the inner peripheral surface of the storage chamber in a sealed state,
And the said terminal metal fitting is inserted from the back of the said 2nd rubber stopper ,
Wherein the distal side of the terminal fittings with a partition wall passed through are accommodated in the hood portion while penetrating the first rubber stopper in a liquid-tight manner,
The rear end side of the terminal fitting, the insulation for the sheet are connected the noise removing circuit electrically Rutotomoni, wherein the outer periphery of the rear end side of the terminal fitting with respect to the second rubber stopper It is in a state of being in close contact with the inner peripheral surface of the terminal insertion hole in a sealed state.

  According to the present invention, by covering the back of the insulating sheet with a rubber plug, the outer periphery of the rubber plug is in a sealed state on the inner peripheral surface of the housing chamber formed in the connector housing, and when the terminal fitting is inserted, The outer periphery of the rear end side of the terminal fitting is in close contact with the inner peripheral surface of the terminal insertion hole formed in the rubber plug to prevent water from entering the insulation sheet and connector housing, thereby preventing short circuits and terminals. It is possible to prevent electrical leakage between the two.

Side sectional view of noise filter built-in waterproof connector according to Embodiment 1 Rear view of waterproof connector with built-in noise filter according to Embodiment 1

A preferred embodiment of the present invention will be described.
(1) The noise filter built-in waterproof connector of the present invention is
The noise removing circuit preferably includes a noise removing capacitor.
According to this configuration, it is possible to provide a high noise filtering function by using a capacitor in the noise removal circuit, and the circuit can be made smaller than when other noise removal means are used, and the connector itself Can also be miniaturized.

(2) The noise filter built-in waterproof connector of the present invention is
The terminal fitting is preferably a bus bar having a sharp tip.
According to this configuration, the terminal fitting can easily penetrate the insulating sheet on which the noise removing circuit is formed, and the terminal fitting and the circuit can be electrically connected, and the connection reliability is excellent.

Next, Example 1 that embodies the waterproof connector with built-in noise filter of the present invention will be described with reference to the drawings.
<Example 1>
The noise filter built-in waterproof connector 10 (hereinafter referred to as a connector) according to the present embodiment includes a plastic connector housing 11, an insulating sheet 21 on which a noise removing circuit 27 is formed, and first and second rubber plugs 33. , 31 and a bus bar terminal (terminal fitting) 41 to which a wire 42 is attached at the rear end. The second rubber plug 31 corresponds to a rubber plug that is a constituent of the present invention. Further, in the following description, in the front-rear direction, the right side in FIG.

  As shown in FIG. 1, the connector housing 11 includes a hood portion 12 that can be fitted with a mating connector (not shown), a rubber plug housing chamber (housing chamber) 16 that can house the insulating sheet 21 and the second rubber plug 31. And a partition wall 17 that partitions the hood portion 12 and the rubber stopper housing chamber 16. A plurality of terminal insertion openings 18 are opened in the partition wall 17 so that the bus bar terminals 41 can penetrate from the rubber stopper housing chamber 16 side.

  The hood portion 12 is formed in a rectangular tube shape by opening the front end side of the connector housing 11 (the connector housing 11 in front of the partition wall 17) over the entire surface. A first rubber plug 33 is accommodated in the hood portion 12 so as to be adjacent to the partition wall 17. The first rubber plug 33 is in close contact with the partition wall 17 when the connector 10 and the mating connector are fitted, and seals between the back end of the hood portion 12 and the front end of the mating connector. Moreover, the outer periphery of the 1st rubber stopper 33 and the inner peripheral surface of the hood part 12 are closely_contact | adhered in the sealing state also at the time of non-fitting.

  The rubber plug housing chamber 16 is opened over the entire rear end side of the connector housing 11 (the connector housing 11 behind the partition wall 17), and is formed in a rectangular tube shape. As shown in FIG. 1, the rubber plug housing chamber 16 has an insulating sheet 21 disposed so that the surface on which the noise removing circuit 27 is formed faces rearward, and the second rubber plug 31 from the rear of the insulating sheet 21. Is housed. The inner peripheral surface of the rubber plug housing chamber 16 is a seal surface 19 with the second rubber plug 31.

  The insulating sheet 21 uses a flexible film 22 having elasticity and flexibility such as polyimide as a substrate, and is formed by sequentially laminating an insulating film such as a copper foil pattern 23 and an epoxy resin. As shown in FIG. 2, the noise removing circuit 27 is composed of a ceramic capacitor (capacitor) 25 fixed to the flexible film 22 and a copper foil pattern 23. The ceramic capacitor 25 and the copper foil pattern 23 are soldered. Electrically connected. A connection region 26 where the bus bar terminal 41 penetrates the copper foil pattern 23 and is electrically connected is formed on the copper foil pattern 23 corresponding to the insertion position of the bus bar terminal 41 as shown in FIG. Yes. Specifically, a copper foil pattern 23 having the same diameter as the bus bar terminal 41 is marked in a perfect circle in the connection region 26, and a cross-shaped cut is made toward the center of the perfect circle. This cut is formed through the copper foil pattern 23 and the flexible film 22.

  The second rubber plug 31 has a plate shape parallel to the partition wall 17 and covers the rubber plug housing chamber 16 on the rear end side of the connector housing 11 as shown in FIG. It is in close contact with the sealing surface 19) in a sealed state. The second rubber plug 31 is formed with a plurality of terminal insertion holes 32 having a perfect cross section so that the bus bar terminal 41 can penetrate in a liquid-tight manner.

  The electric wire 42 is a covered electric wire in which a conductor made of an aluminum alloy or a copper alloy is covered with an insulating coating. The bus bar terminal 41 is composed of a copper alloy connecting portion 44 having a round bar shape with a sharp tip and a cylindrical synthetic resin case portion 43. As shown in FIG. 1, the diameter of the connection portion 44 is smaller than the diameter of the case portion 43. And the case part 43 is distribute | arranged to the rear-end part of the connection part 44, and the electric wire 42 and the connection part 44 which were connected by crimping | compression-bonding are accommodated. Further, the case portion 43 also serves as a grip portion when the bus bar terminal 41 is inserted. Note that the diameter of the case portion 43 of the bus bar terminal 41 and the diameter of the terminal insertion hole 32 of the second rubber plug 31 is slightly larger than the diameter of the terminal insertion hole 32. With such dimension setting, when the bus bar terminal 41 is inserted, the sealing performance between the case portion 43 and the inner peripheral surface of the terminal insertion hole 32 that is in close contact with the outer periphery thereof can be enhanced.

  Next, a procedure for inserting the bus bar terminal 41 will be described.

  The bus bar terminal 41 is inserted into a terminal insertion hole 32 formed in the second rubber plug 31. Thereafter, the connection portion 44 of the bus bar terminal 41 reaches the connection region 26 on the insulating sheet 21. As described above, the connection region 44 is easily cut in a cross shape as described above. To penetrate. Then, the copper foil pattern 23 of the noise removal circuit 27 and the connection portion 44 are brought into sliding contact with the insertion of the terminal, whereby the bus bar terminal 41 and the noise removal circuit 27 are electrically connected. Thereafter, when the bus bar terminal 41 is further inserted, the connecting portion 44 passes through the terminal insertion port 18 formed in the partition wall 17 and further passes through the first rubber plug 33 in a liquid-tight manner, so that the connecting portion 44 is connected to the hood portion. 12 (the connecting portion 44 accommodated in the hood portion 12 is electrically connected when fitted to the mating connector). When the rear end surface of the case portion 43 is flush with the rear end surface of the second rubber plug 31, the insertion of the bus bar terminal 41 is completed.

  Next, the effect of Example 1 is demonstrated.

  In the conventional noise filter built-in connector 10, the insulating sheet 41 is exposed, but in Example 1, the insulating sheet 21 and the connector housing 11 are covered by covering the back of the insulating sheet 21 with the second rubber plug 31. Can be waterproofed. Specifically, the inner peripheral surface of the rubber plug housing chamber 16 of the connector housing 11 and the outer periphery of the second rubber plug 31 are tightly sealed to prevent water from entering the rubber plug housing chamber 16. Even after the bus bar terminal 41 is inserted, the inner peripheral surface of the terminal insertion hole 32 provided in the second rubber plug 31 is tightly sealed to the outer periphery of the case portion 43 formed at the rear end of the bus bar terminal 41. Therefore, it is possible to prevent water from entering from the terminal insertion hole 32.

  Further, by adopting the ceramic capacitor 25 that can be miniaturized for the noise removing circuit 27, the connector 10 itself can be miniaturized.

  Further, by adopting the bus bar terminal 41 having a sharp tip (connection portion 44) as the terminal fitting, it becomes possible to easily penetrate the insulating sheet 21 on which the noise removing circuit 27 is formed. Connection reliability with the removal circuit 27 can be improved.

  As described above, according to the present invention, the second rubber plug 31 covers the back of the insulating sheet 21 on which the noise removing circuit 27 is formed, thereby preventing water from entering the insulating sheet 21 and the connector housing 11. It becomes possible to prevent a short circuit of the circuit and a leakage between terminals. Further, by applying a capacitor to the noise removal circuit 27, the noise filtering characteristics are not impaired, the connector 10 itself can be miniaturized, and the bus bar terminal 41 having a sharp tip is used as the terminal metal, so that the terminal metal Connection reliability with the noise removal circuit 27 can be improved. Further, since it can be connected to the noise removal circuit 27 at a position near the tip of the terminal fitting, it is possible to prevent noise from being superimposed again in the process of current flowing to the tip of the terminal fitting.

<Other embodiments>
The present invention is not limited to the embodiments 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.
(1) In the above embodiment, a ceramic capacitor is used for the noise removal circuit. However, according to the frequency band of the noise to be removed, the capacitance of the capacitor can be changed, other capacitors (film capacitors, electrolytic capacitors) or resistors. A circuit may be configured by using a ceramic, an inductor, a ferrite core, or the like, or mounting them together.
(2) In the above embodiment, the copper foil pattern is used for the noise removing circuit. However, other metal foil patterns such as gold, silver, and nickel alloy may be used.
(3) In the above embodiment, polyimide is used as the substrate of the insulating sheet, but other flexible films such as pentacene and rubrene may be used.
(4) In the above embodiment, the bus bar is used as the terminal fitting, but a female terminal fitting or a male terminal fitting other than the bus bar may be used.
(5) In the above embodiment, the bus bar is formed of a copper alloy, but other metals may be used.
(6) In the above embodiment, the noise filter built-in type waterproof connector is configured with one insulating sheet on which a noise removing circuit is formed. However, a plurality of insulating sheets may be stacked.
(7) Although the cross section of the terminal insertion hole is a perfect circle in the above embodiment, other shapes may be used.
(8) Although the cross section of the case portion of the bus bar is a perfect circle in the above embodiment, other shapes may be used.

10 ... Connector (waterproof connector with built-in noise filter)
11 ... Connector housing 16 ... Rubber stopper housing (housing chamber)
21 ... Insulation sheet 25 ... Ceramic capacitor (capacitor)
27 ... Noise removal circuit 31 ... Second rubber plug (rubber plug)
32 ... Terminal insertion hole 41 ... Bus bar terminal (bus bar, terminal fitting)

Claims (3)

A noise filter built-in waterproof connector that fits in a sealed state with the mating connector,
Terminal fittings,
A connector housing in which a hood portion opening forward and a storage chamber opening rearward are partitioned by a partition wall ;
A first rubber stopper provided on the front side of the partition wall and in close contact with the inner peripheral surface of the hood portion;
An insulating sheet disposed in the housing chamber and formed with a noise removing circuit;
And having a terminal insertion hole, covering the insulating sheet from behind, and a second rubber stopper accommodated in the accommodation chamber,
The second rubber stopper is in close contact with the inner peripheral surface of the storage chamber in a sealed state,
And the said terminal metal fitting is inserted from the back of the said 2nd rubber stopper ,
Wherein the distal side of the terminal fittings with a partition wall passed through are accommodated in the hood portion while penetrating the first rubber stopper in a liquid-tight manner,
The rear end side of the terminal fitting, the insulation for the sheet are connected the noise removing circuit electrically Rutotomoni, wherein the outer periphery of the rear end side of the terminal fitting with respect to the second rubber stopper A noise filter built-in waterproof connector characterized in that it is in close contact with the inner peripheral surface of the terminal insertion hole in a sealed state.   The waterproof connector with built-in noise filter according to claim 1, wherein the noise removing circuit includes a noise removing capacitor.   The waterproof connector with built-in noise filter according to claim 1, wherein the terminal fitting is a bus bar having a sharp tip.

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