JPH09232014A - Interface cable connecting connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain spurious electromagnetic wave radiation, by contacting one side pads to the other side pads, formed by electrically connecting a power source wiring layer and a ground wiring layer, on the surface to be contacted of a printed circuit board; in fitting a connector to the printed circuit board. SOLUTION: This connector is constituted of plural pins 3, a housing 4 for fixing these pins 3, a power source decoupling capacitor 5 embedded in the inside of the housing 4, power sources on both ends of the capacitor 5, and pads 6 for electrically connecting power sources on both the ends of the capacitor 5 and pads 8 provided on a printed circuit board 2. The pads 8 are connected with the power source wiring layer of the 2 and a ground wiring layer. The pins 3 are inserted into the connector fitting part of the board 2, to provide pin holes 7 for connecting a circuit wiring, and the pins 3 are insertedly engaged with the pin holes 7, to fix a connector 1 to the substrate 2. The pads 6, connected to the electrodes of the ends of the capacitor 5, and the pads 8, provided on the board 2, are formed at the position relation so as to contacted with each other when the connector 1 is fitted to the board 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interface cable connecting connector for mounting on a printed circuit board to connect an interface cable, and more particularly to an interface cable connecting connector for suppressing unnecessary electromagnetic radiation.

[0002]

2. Description of the Related Art In general, unnecessary electromagnetic waves are generated with the operation of electronic equipment. Unwanted electromagnetic waves interfere with broadcasting and wireless communication systems, so the strength of the electromagnetic waves must be below the value specified in the standard. By the way, in an interface cable connected to a printed circuit board on which electronic devices and electronic circuits are mounted, the cable itself acts as an antenna to radiate a high level of unwanted electromagnetic waves, and therefore it is necessary to suppress the radiation of these unwanted electromagnetic waves. Is. In order to suppress the emission of unnecessary electromagnetic waves from the interface cable,
Several techniques have been implemented so far.

For example, in Japanese Patent Laid-Open No. 3-96297, as shown in FIG. 14, a ground pin 74 of a connector 72 and a ground pattern 76 of a printed circuit board 71 are soldered in order to strengthen the ground of the entire device. The structure in which the ground pattern 76 of the printed circuit board 71 and the conductor of the housing 77 are connected by the fixing means 75 in the immediate vicinity of the connector 72 has been adopted. With this structure, the ground potential between the printed circuit board 71 and the casing 77 is reduced, and the emission of unnecessary electromagnetic waves due to the fluctuation of the ground voltage is suppressed.

Further, in Japanese Patent Laid-Open No. 5-13132,
As shown in FIG. 15, with a structure in which a ferrite 80 is attached to a pin header 79 inside a connector 78 which serves as an input / output portion of an electric circuit, as a noise prevention element, the method disclosed in Japanese Patent Laid-Open No.
In Japanese Patent No. 6826, as shown in FIG.
An EMI filter 83 for preventing unnecessary electromagnetic wave radiation is integrally incorporated into the pin 82 inside the unit 1, and the structure in which one end of this filter 83 is connected to the ground removes the high frequency component transmitted to the cable, thereby eliminating the unnecessary electromagnetic wave radiation. The high frequency component was suppressed.

Furthermore, in "March 1995, 9th Academic Conference on Circuit Packaging, 14C-13", as shown in FIG. 17, a power supply decoupling for short-circuiting a power supply wiring layer and a ground wiring layer at a high frequency. By mounting the ring capacitors 84 on the entire printed circuit board 83 in a dispersed manner, fluctuations in power supply voltage are suppressed, and unnecessary electromagnetic waves caused by fluctuations in power supply voltage are suppressed.

[0006]

There are factors such as common mode current flowing in the ground, a voltage between the signal wiring and the ground wiring, a voltage between the power wiring and the ground wiring, and the like as factors of unwanted electromagnetic radiation in the electronic device.

In the structure according to Japanese Patent Laid-Open No. 3-96297, unnecessary electromagnetic wave radiation from the common mode current flowing due to fluctuations in the ground voltage is suppressed, but electromagnetic radiation having other causes, for example, between signal wiring and ground wiring. Voltage,
There is a problem in that it is not possible to suppress unnecessary electromagnetic wave radiation generated by the voltage generated between the power supply wiring and the ground wiring.

Further, in the structures disclosed in Japanese Patent Laid-Open Nos. 5-13132 and 7-6826, unnecessary electromagnetic wave radiation caused by the voltage between the signal wiring and the ground wiring can be suppressed, but the power wiring There is a problem in that it is not possible to suppress unnecessary electromagnetic waves caused by voltage fluctuations between the ground wiring and the ground wiring.

Further, in the method of mounting the power supply decoupling capacitor over the entire printed circuit board, unnecessary electromagnetic radiation due to voltage fluctuation between the power supply wiring and the ground wiring is suppressed, but when the circuit packaging density is high, the power supply decoupling is performed. There is a problem that the number of ring capacitors and the mounting positions are limited. In particular, the circuit mounting density is high near the connector, and it is often impossible to mount the power supply decoupling capacitor in the vicinity thereof. In addition, IC (I
Since the power supply decoupling capacitors other than the vicinity of the integrated circuit) are not directly related to the operation of the circuit, they have a problem that they are neglected in the circuit design.

An object of the present invention is to efficiently suppress unnecessary electromagnetic waves radiated by the interface cable as an antenna due to fluctuations in the power supply voltage of the printed circuit board, and to be easily applied to a high-density mounted printed circuit board. To provide a connector for connection.

[0011]

The interface cable connecting connector of the present invention is a connector for connecting an interface cable which is attached to a printed circuit board to connect the interface cable. A housing, a capacitor embedded in the housing, and a pad formed on the contact surface with the printed circuit board so as to be electrically connected to electrodes on both ends of the capacitor, The structure is characterized in that the pad comes into contact with the pad formed by being electrically connected to the power supply wiring layer and the ground wiring layer on the contacted surface of the printed circuit board at the time of mounting.

The connector for connecting an interface cable of the present invention is a connector for connecting an interface cable which is attached to a printed circuit board to connect an interface cable, wherein a plurality of pins, a housing for fixing these pins, and a capacitor are mounted. And another pad formed on the contact surface with the printed circuit board by being electrically connected to the pad via a conductor, and the other pad when attached to the printed circuit board. The pad is in contact with a pad formed by being electrically connected to the power supply wiring layer and the ground wiring layer on the contacted surface of the printed circuit board.

The connector for connecting an interface cable of the present invention is a connector for connecting an interface cable which is attached to a printed circuit board to connect an interface cable, and a plurality of pins, a housing for fixing these pins, and a housing for fixing the pins. A pad formed around the contact surface with the printed circuit board from the side surface to enable mounting of a capacitor, and the pad supplies power to the contact surface of the printed circuit board when mounted on the printed circuit board. The structure is characterized by being in contact with a pad formed by being electrically connected to the wiring layer and the ground wiring layer.

The interface cable connecting connector of the present invention is an interface cable connecting connector for mounting on a printed circuit board to connect an interface cable, wherein a plurality of pins and a contact surface between the pins and the printed circuit board are fixed. A housing having an edge, and a pad formed to enable mounting of a capacitor on the edge, the pad being mounted on the printed circuit board so that the pad supplies power to a contact surface of the printed circuit board. The structure is characterized by being in contact with a pad formed by being electrically connected to the layer and the ground wiring layer.

The interface cable connecting connector of the present invention is an interface cable connecting connector for mounting on a printed circuit board to connect an interface cable, wherein a plurality of pins and a contact surface between the pins and the printed circuit board are fixed. A housing having a capacitor mounting recess formed therein, and a leaf spring-shaped conductor piece that wraps around the capacitor mounting recess from the contact surface with the printed circuit board to embed the capacitor in the capacitor mounting recess. And a pad that can be mounted on the printed circuit board, the capacitor being fixed in the capacitor mounting recess by the elasticity of the pad when the capacitor is mounted, and the pad being mounted on the printed circuit board. Power supply is placed on the contacted surface of the printed circuit board. It characterized the structure in contact with the layer and the ground wiring layer electrically connected to pads formed.

The connector for connecting an interface cable of the present invention is a connector for connecting an interface cable which is attached to a printed circuit board to connect an interface cable, and a plurality of pins, a housing for fixing these pins, and a specific adjoining member. A pin that is formed by electrically connecting a power supply wiring layer and a ground wiring layer to the printed circuit board when the printed circuit board is mounted on the printed circuit board. It features a structure that is inserted into the hole.

The connector for connecting an interface cable of the present invention is a connector for connecting an interface cable which is attached to a printed circuit board to connect an interface cable, and a plurality of pins, a housing for fixing these pins, and specific or all. And a pad formed so that a capacitor for connecting between adjacent pins can be mounted on the pins of the power supply wiring layer on the printed circuit board at the time of attachment to the printed circuit board. And a structure to be inserted into a pin hole formed by being electrically connected to the ground wiring layer.

The connector for connecting an interface cable of the present invention is a connector for connecting an interface cable which is attached to a printed circuit board to connect an interface cable, a plurality of pins, a housing for fixing these pins, a specific or A pad formed so that a capacitor for connecting between adjacent pins can be mounted on all pins, the pad is exposed on a side surface of the housing, and the pad and the pin are formed by using a conductor. It is characterized in that the capacitor can be mounted on the side surface of the housing by electrically connecting the capacitors.

The interface cable connecting connector of the present invention is an interface cable connecting connector for mounting on a printed circuit board to connect an interface cable, wherein a plurality of pins and a contact surface between the pins and the printed circuit board are fixed. A housing having a capacitor mounting recess formed therein, and a leaf spring-shaped conductor piece that wraps around the capacitor mounting recess from the contact surface with the printed circuit board to embed the capacitor in the capacitor mounting recess. And a pad electrically connected to a specific pin of the plurality of pins, and the capacitor is mounted in the capacitor mounting recess due to elasticity of the pad when the capacitor is mounted. Fixed to the printed circuit board. It said specific pin characterized the structure is inserted into the printed circuit power supply wiring layer and the ground wiring layer on the contacted surface of the substrate and electrically connected to a pin hole formed at the time of attaching.

According to the mounting structure of the present invention, in the mounting structure of the connector for connecting the interface cable for connecting the interface cable to the printed circuit board, the pad connected to the capacitor built in the connector or the pad connected to this pad is connected. The structure is characterized in that another pad comes into contact with a pad formed by being electrically connected to the power supply wiring layer and the ground wiring layer on the contacted surface of the printed circuit board.

According to the mounting structure of the present invention, in the mounting structure of the connector for connecting the interface cable for connecting the interface cable to the printed circuit board, the pin connected to the capacitor built in the connector or the pad for mounting the capacitor is used. The connected pins are
The printed circuit board corresponding to the pin is inserted into a pin hole formed by being electrically connected to the power supply wiring layer and the ground wiring layer.

[0022]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

First, the experimental form which is the premise of the present invention and its result will be described.

In a multilayer printed circuit board such as a four-layer board or a six-layer board, in many cases, the power supply wiring and the ground wiring are individually dedicated layers, and in these layers, conductor portions extend over the entire surface of the board, a so-called solid pattern. Is adopted. At this time, since the power supply wiring layer and the ground wiring layer act as a parallel-plate transmission line, a high frequency power supply voltage variation between the power supply wiring layer and the ground wiring layer generated near the IC due to the circuit operation propagates to the entire substrate. . Since this transmission line has a finite length, high-frequency signals are reflected at the ends of the substrate and the mounting portion of the power supply decoupling capacitor that short-circuits the power supply wiring layer and the ground wiring layer in a high frequency,
Resonates at a specific frequency. Unwanted electromagnetic radiation increases in the frequency band near resonance. By changing the number and capacity of capacitors that connect the power supply wiring layer and the ground wiring layer,
The resonance frequency changes, and the unwanted electromagnetic wave radiation characteristic can be changed.

FIG. 12 is a perspective view showing a printed circuit board used in the experiment. The power supply decoupling capacitors 62 were mounted at the connector mounting portion of the four-layer printed circuit board 61 mounting the electronic circuit, and the number thereof was changed. A shielded cable 64 is connected to the connector 63, and the tip of the shielded cable 64 is an open end.

FIG. 13 is a diagram showing characteristics of unnecessary electromagnetic waves emitted from the printed circuit board 61 at a position 3 m apart. The horizontal axis is frequency, 30 MHz to 1000 MHz
The range is shown. The vertical axis is the radiated electric field strength, and the unit is dBμ.
V / m. A solid line shows characteristics when there is no power supply decoupling capacitor 62 near the connector 63, and a broken line shows characteristics when one power supply decoupling capacitor 62 having a capacitance of 1 μF is attached. The characteristics when attached are shown by the alternate long and short dash lines.

When the power supply decoupling capacitor 62 is not provided, the radiated electric field strength is the highest at around 200 MHz, whereas when one power supply decoupling capacitor 62 is attached, the radiated electric field strength in the 200 MHz band becomes weaker.
The radiated electric field strength near 80 MHz increases. 280MHz
The radiated field strength at is lower than the level at 200 MHz without the power supply decoupling capacitor 62. Further, when two power supply decoupling capacitors 62 are attached, the radiated electric field strength at 200 MHz and 280 MHz becomes low, but the radiated electric field strength near 350 MHz becomes strong. The radiated electric field strength at 350MHz is 200M without the power supply decoupling capacitor 62.
It is lower than the level at Hz and the level at 280 MHz when only one power supply decoupling capacitor 62 is attached.

As described above, by attaching a power supply decoupling capacitor near the interface cable connecting connector of the printed circuit board and increasing the number thereof, unnecessary electromagnetic radiation changes its peak frequency to the high frequency side, In addition, the electric field strength at the peak decreases.

In the present invention, by utilizing this feature, a power supply decoupling capacitor is mounted in advance on the connector for connecting the interface cable, or a power supply decoupling capacitor can be mounted, and the number of power supply decoupling capacitors that can be mounted is variable. The structure adopted is. As a result, the peak frequency and the level of the radiated electric field intensity are adjusted to conform to the standard of the unnecessary electromagnetic wave radiation characteristic. Further, when the printed circuit board is designed, it is not necessary to pay special attention to the mounting of the power supply decoupling capacitor in the connector mounting portion, so that the circuit layout need not be changed after the circuit design is completed.

FIG. 1 is a partially cutaway perspective view of a connector mounting portion of an interface cable connecting connector (hereinafter, simply referred to as a connector) 1 and a printed circuit board 2 to which the connector 1 is mounted according to a first embodiment of the present invention. It is a figure. The connector 1 is a connector for vertically connecting an interface cable (not shown) to the printed circuit board 2, and has a plurality of pins 3, a housing 4 for fixing these pins 3, and a housing 4 embedded in the housing 4. A power supply decoupling capacitor (hereinafter, simply referred to as a capacitor) 5 and electrodes on both ends of the capacitor 5 and pads (hereinafter, referred to as a power supply wiring / ground wiring short circuit pad) 8 provided on the printed circuit board 2 are electrically connected. Pad 6 (hereinafter, referred to as capacitor mounting pad) for The power supply wiring / ground wiring short circuit pads 8 are connected to the power supply wiring layer and the ground wiring layer of the printed circuit board 2, respectively.

The connector mounting portion of the printed circuit board 2 is provided with a pin hole 7 for inserting the pin 3 to connect the circuit wiring, and by fitting the pin 3 into the pin hole 7, the connector 1 Are fixed to the printed circuit board 2.

The connector 1 is attached to the printed circuit board 2 between the capacitor mounting pad 6 connected to the electrodes on both ends of the capacitor 5 and the power supply / ground wiring short-circuit pad 8 provided on the printed circuit board 2. The conductors are made of copper, copper alloy, or the like in such a positional relationship that they come into contact with each other. The power supply wiring / ground wiring shorting pad 8 is provided in advance at the circuit design stage so as to be electrically connected to the connector mounting portion of the printed circuit board 2 with the power supply wiring layer and the ground wiring layer.

In the connector 1 according to the first embodiment configured as described above, the connector 1 is connected to the printed circuit board 2
When it is attached to the power supply wiring layer, the power supply wiring layer and the ground wiring layer are inevitably short-circuited in a high frequency manner via the capacitor 5, and the emission of unnecessary electromagnetic waves due to the fluctuation of the power supply voltage can be suppressed. Therefore, it is not necessary to pay special attention to mounting the capacitor 5 on the printed circuit board 2 at the circuit design stage, and the design changes after the circuit design is completed are significantly reduced.

The capacitor 5 installed in the connector 1
The number of is not limited to one, and a plurality of may be arranged. The capacitor 5 may be mounted anywhere on the contact surface with the printed circuit board 2, but the end of the connector 1 where the pin 3 does not exist is relatively easy to mount.

FIG. 2 is a cross-sectional view of a connector 11 which is a modification of the connector 1 according to the first embodiment of the present invention. The connector 11 of this example is a connector for connecting an interface cable in parallel to the printed circuit board 2, and has an L-shaped pin 13, a housing 14 having an L-shaped cross section, and a capacitor built in the housing 14. 5 and
The capacitor mounting pad 16 is connected to the electrodes on both ends of the capacitor 5, respectively.

In the connector 11 which is a modified example of the first embodiment configured as described above, the connector 11 is mounted on the printed circuit board 2 by mounting the connector on the printed circuit board 2 in the same manner as the connector 1 of FIG. Pin 1 in the provided pin hole 7
3 is inserted so that the capacitor mounting pad 6 and the power supply wiring / ground wiring short-circuiting pad 8 provided on the printed circuit board 2 come into contact with each other.

FIG. 3 is a perspective view of the connector 21 according to the second embodiment of the present invention and the connector mounting portion of the printed circuit board 2 on which the connector 21 is mounted. The connector 21 includes a plurality of pins 26, a housing 22 that fixes the pins 26, and a capacitor mounting pad 23 that allows the capacitor 5 to be mounted on the upper surface of the housing 22.
And a pad (hereinafter referred to as contact pad) 25 provided on the lower surface of the housing 22 (contact surface with the printed circuit board 2) so as to face the capacitor mounting pad 23.
And a conductor 24 made of copper, copper alloy or the like for electrically connecting between the capacitor mounting pad 23 and the contact pad 25, respectively.

In the connector 21 according to the second embodiment having such a configuration, the connector mounting pad 23 is provided on the upper surface of the housing 22 so that the connector 2
The capacitor 5 can be mounted or replaced with the capacitor 1 mounted on the printed circuit board 2. By changing the capacity of the capacitor 5 to be mounted, it is possible to change the unnecessary electromagnetic wave radiation characteristic and adjust so as to satisfy the standard. Further, a plurality of pairs of the capacitor mounting pads 23 and the contact pads 25 are provided, and the capacitor mounting pad 2 is provided.
By providing the power supply wiring / ground wiring short-circuiting pad 8 corresponding to 3 and the contact pad 25 on the printed circuit board 2, the number of capacitors 5 that can be mounted becomes variable, and by changing the number of capacitors 5, unnecessary electromagnetic wave radiation is generated. The characteristics can be adjusted.

The connector 2 according to the second embodiment
1 is not limited to the structure shown in FIG. 3, and other structures are also effective.

For example, in the connector 21 shown in FIG. 3, since the conductor 24 connecting the capacitor mounting pad 23 and the contact pad 25 is long, the inductance is large,
Due to the voltage drop, high frequency voltage fluctuation may not be sufficiently suppressed. Therefore, as shown in FIG. 4, in the connector 21 ′ according to the modification of the second embodiment, the capacitor mounting pad 23 ′ is provided in the housing 22 ′.
The capacitor mounting pad 23 'is bent at a right angle and wraps around the contact surface with the printed circuit board 2.

In the connector 21 'according to the modification of the second embodiment configured as described above, the capacitor mounting pad 23' is bent at a right angle and the contact surface with the printed circuit board 2 from the side surface of the housing 22 '. Since the pin 26 'is inserted into the pin hole 7 and the connector 21' is attached to the printed circuit board 2,
The distance between the capacitor 5 and the power supply / ground wiring short-circuit pad 8 on the printed circuit board 2 can be shortened, and the voltage drop can be reduced. It should be noted that the capacitor mounting pad 23 'may have a structure which allows the inside of the housing 22' to pass therethrough. In addition, the capacitor mounting pad 23 'is provided not only on the side surface in the longitudinal direction of the connector 21' but also on the side surface in the width direction to increase the number of capacitors 5 that can be mounted and to adjust the unnecessary electromagnetic wave radiation characteristics. Can be extended.

Further, in the connector 21 'shown in FIG. 4, since the capacitor 5 is mounted on the side surface of the housing 22', the capacitor 5 is mounted on the capacitor mounting pad 23 'when mounted on the printed circuit board 2. May be difficult. Therefore, as shown in FIG. 5, a connector 31 according to another modification of the second embodiment has a structure in which an edge 32a is provided on the contact surface with the printed circuit board 2 around the housing 32.

In the connector 31 according to another modification of the second embodiment configured as described above, a rim 32a is provided in a portion of the housing 32 which is in contact with the printed circuit board 2.
Since the capacitor mounting pad 34 is provided on the edge 32a, the capacitor 5 can be easily mounted. Also, edge 3
Since the height of 2a is low, when the pin 33 is inserted into the pin hole 7 and the connector 31 is attached to the printed circuit board 2, the capacitor 5 and the power wiring on the printed circuit board 2
The distance to the ground wiring short-circuit pad 8 can be shortened. Further, by forming the capacitor mounting pad 34 in a U shape along the edge 32a, the number of parts can be reduced. The edge 32a may be provided around the entire periphery of the housing 32 as shown in FIG. 5, or may be provided only on a part of the side surface in the longitudinal direction, only the side surface in the width direction, or the like.

FIG. 6 is a cross-sectional view of a connector 31 'according to another modification of the second embodiment at a capacitor mounting position. In the connector 31 ′ of this example, the connector 3 is formed by forming a capacitor mounting recess on the lower surface (contact surface with the printed circuit board 2) of the housing 32 ′.
The capacitor 5 can be mounted in a state of being embedded in 1 '. The capacitor mounting pad 34 ′ that comes into contact with the power supply wiring / ground wiring short-circuiting pad 8 on the printed circuit board 2 when the pin 33 ′ is inserted into the pin hole 7 and the connector 31 ′ is attached to the printed circuit board 2 is It is formed of a conductor piece of copper, copper alloy, or the like so as to wrap around from the contact surface with the printed circuit board 2 to the capacitor mounting recess, and the contact parts 34a 'with the electrodes at both ends of the capacitor 5 are spring-shaped. . Therefore, when the capacitor 5 is press-fitted into the capacitor mounting concave portion, the electrodes on both ends of the capacitor 5 contact the contact portion 3.
At the same time as being in contact with 4a 'and being electrically connected to the capacitor mounting pad 34', it is fixed in the capacitor mounting recess of the connector 31 'by the elasticity of the contact portion 34a'.

In the connector 31 'according to another modification of the second embodiment having the above-described structure, the capacitor 5 can be mounted on the connector 31' without soldering, so that the capacitance of the capacitor 5 can be adjusted. Measures to suppress unnecessary electromagnetic radiation become easy.

FIG. 7 is a perspective view of the connector 41 and the connector mounting portion of the printed circuit board 42 for mounting the connector 41 according to the third embodiment of the present invention. The connector 41 includes a plurality of pins 43 and a plurality of other pins (hereinafter, referred to as capacitor mounting pins) 44, a housing 45 for fixing the pins 43 and the capacitor mounting pins 44, and a specific adjacent capacitor mounting. It is composed of a capacitor 5 which connects between the working pins 44. The capacitor 5 is a capacitor mounting pad 4 provided in electrical contact with the capacitor mounting pin 44.
Installed in 7. In the connector mounting portion of the printed circuit board 42, a plurality of pin holes 48 for inserting the pins 43 and the capacitor mounting pins 44 to connect to the circuit wiring and other pin holes (hereinafter, power wiring / ground wiring). A short-circuit pin hole) 49 is provided. The power wiring / ground wiring short-circuit pin hole 49 is provided in advance at the circuit design stage in the connector mounting portion of the printed circuit board 2 so as to be electrically connected to the power wiring layer and the ground wiring layer.

In the connector 41 according to the third embodiment having such a configuration, the pin 43 and the capacitor mounting pin 44 are provided in the pin hole 48 of the printed circuit board 42 and the power wiring / ground wiring short-circuiting pin hole 49. It is fitted and fixed to the printed circuit board 42. Power supply wiring corresponding to the capacitor mounting pin 44 on which the capacitor 5 is mounted /
The ground wiring short-circuit pin hole 49 is formed in the printed circuit board 4.
2 are respectively connected to the power supply wiring layer and the ground wiring layer, and by mounting the connector 41 on the printed circuit board 42, the power supply wiring layer and the ground wiring layer of the printed circuit board 42 are inevitably connected via the capacitor 5. Short-circuited at high frequency.

FIG. 8 shows a capacitor mounting pin 44 'adjacent to a connector 41' according to a modification of the third embodiment.
It is a cross-sectional view cut by a plane passing through. The mounting position of the capacitor 5 is set so as to connect between the capacitor mounting pins 44 '. Printed circuit board 42 of housing 45 '
The capacitor 5 is mounted by forming a capacitor mounting recess on the contact surface with the capacitor.

In the connector 41 'according to the modified example of the third embodiment configured as described above, the printed circuit board 4
The capacitor mounting pin 4 is formed by forming a capacitor mounting recess on the contact surface with the capacitor 2 and mounting the capacitor 5.
The influence of the voltage drop due to the 4'inductance can be minimized. The connector 3 shown in FIG.
1 ', the capacitor mounting pad 47' is formed of a spring-shaped conductor piece, and the elasticity of the conductor piece allows the capacitor 5 to be formed.
Can be fixed to the concave portion for mounting the capacitor.

FIG. 9 is a plan view showing a connector 51 according to the fourth embodiment of the present invention. There is provided a capacitor mounting pad 53 that enables mounting of the capacitor 5 between specific adjacent pins of the plurality of pins 52 of the connector 51 or between all adjacent pins.

In the connector 51 according to the fourth embodiment having such a configuration, among the pin holes provided in the printed circuit board 42, the connector mounting pins 52 provided with the capacitor mounting pads 53 are provided. Any pin hole that can be connected to the power supply wiring layer and the ground wiring layer can be connected to the printed circuit board 4
There is a degree of freedom in the allocation of the pins on the board 2, which is advantageous in the circuit board design. Further, since the capacity and number of the capacitors 5 to be mounted can be selected, it becomes easy to take measures to suppress unnecessary electromagnetic radiation by adjusting these. Although the mounting position of the capacitor 5 is set to a position where the pins are connected to each other, by mounting the capacitor 5 on the contact surface with the printed circuit board 42, the influence of the inductance of the capacitor mounting pin 52 can be minimized.

FIG. 10 is a perspective view showing a connector 54 according to a modification of the fourth embodiment of the present invention. In the connector 54 of this example, the capacitor mounting pad 58 electrically connected to the capacitor mounting pin 56 is exposed to the side surface of the housing 55 using the conductor 57.

In the connector 54 according to the modification of the fourth embodiment having such a configuration, the capacitor mounting pad 58 is exposed to the side surface of the housing 55 by using the conductor 57, so that the side surface of the housing 55 is exposed. The capacitor 5 can be mounted, and the work of mounting the capacitor 5 becomes easy.

FIG. 11 is a cross sectional view of a connector 54 'according to another modification of the fourth embodiment, taken along a plane passing through two adjacent capacitor mounting pins 56'. By forming a capacitor mounting recess on the contact surface of the housing 55 'with the printed circuit board 42,
Can be mounted in a state of being embedded in the connector 54 '. The capacitor mounting pin 56 'has a spring-shaped capacitor mounting pad 5 having contact portions 58a' with electrodes on both ends of the capacitor 5.
8'is provided, and the capacitor 5 is fixed by the elasticity of the contact portion 58a 'while being inserted into the capacitor mounting recess of the connector 54'.

In the connector 54 'according to another modification of the fourth embodiment having the above-described structure, the capacitor 5 can be mounted on the connector 54' without soldering, so that the capacitance of the capacitor 5 can be adjusted. Measures to suppress unnecessary electromagnetic radiation become easy.

[0056]

As described above, according to the present invention,
Embed a capacitor inside the connector so that when mounting the connector to the printed circuit board, the capacitor mounting pads connected to the electrodes on both ends of the capacitor and the power supply / ground wiring short-circuit pads provided on the printed circuit board should come into contact with each other. By doing so, the power supply wiring layer and the ground wiring layer of the printed circuit board are short-circuited at a high frequency through the capacitor built into the connector, so that the interface cable can be connected to the antenna due to fluctuations in the power supply voltage of the printed circuit board. As a result, there is an effect that unnecessary electromagnetic waves radiated as are efficiently suppressed, and it is possible to adjust the peak frequency and the level of the radiated electric field strength to meet the standard of the unnecessary electromagnetic wave radiation characteristics. In addition, since it is not necessary to pay special attention to the mounting of capacitors in the connector mounting part of the printed circuit board at the circuit design stage, the change in the circuit layout after the circuit design is completed is greatly reduced, and it can be used for high-density mounted printed circuit boards. It has an effect of easy application.

According to the present invention, the connector is provided with a capacitor mounting pad, and when the connector is mounted on the printed circuit board, the capacitor mounting pad and the power supply wiring / ground wiring shorting pad provided on the printed circuit board are provided. Since the contact between the power supply wiring layer and the ground wiring layer of the printed circuit board is short-circuited at a high frequency through the capacitor mounted on the capacitor mounting pad, the fluctuation of the power supply voltage of the printed circuit board can be prevented. As a result, unnecessary electromagnetic waves radiated by the interface cable as an antenna are efficiently suppressed, and it is possible to adjust the peak frequency and the level of the radiated electric field strength to meet the standards for unnecessary electromagnetic wave radiation characteristics. . In addition, since it is not necessary to pay special attention to the mounting of capacitors in the connector mounting part of the printed circuit board at the circuit design stage, the change in the circuit layout after the circuit design is completed is greatly reduced, and it can be used for high-density mounted printed circuit boards. It has an effect of easy application.

Furthermore, according to the present invention, the connector is provided with a capacitor for connecting between the capacitor mounting pins, and the power source wiring / ground wiring provided on the capacitor mounting pin and the printed circuit board when the connector is mounted on the printed circuit board. Since the short-circuit pin holes are fitted to each other, the power supply wiring layer and the ground wiring layer of the printed circuit board are short-circuited at a high frequency through the capacitor mounted on the connector, so that the power supply of the printed circuit board is reduced. Unwanted electromagnetic waves that radiate from the interface cable as an antenna due to voltage fluctuations can be efficiently suppressed, and it becomes possible to adjust the peak frequency and the level of the radiated electric field strength to meet the standards for unwanted electromagnetic wave radiation characteristics. Have an effect. In addition, since it is not necessary to pay special attention to the mounting of capacitors in the connector mounting part of the printed circuit board at the circuit design stage, the change in the circuit layout after the circuit design is completed is greatly reduced, and it can be used for high-density mounted printed circuit boards. It has an effect of easy application.

Further, according to the present invention, the connector is provided with a capacitor mounting pad for connecting a specific or all adjacent pins, and the capacitor mounting pin and the printed circuit board are provided when the connector is mounted on the printed circuit board. The power supply wiring / ground wiring short-circuiting pin holes are fitted to each other, so that the power supply wiring layer and the ground wiring layer of the printed circuit board have high frequency through the capacitor mounted on the connector mounting pad. Since it is short-circuited, unwanted electromagnetic waves that radiate from the interface cable as an antenna due to fluctuations in the power supply voltage of the printed circuit board are efficiently suppressed, and the levels of the peak frequency and radiated electric field strength are adjusted to meet the standards for unwanted electromagnetic radiation characteristics. This has the effect that it is possible to achieve In addition, since it is not necessary to pay special attention to the mounting of capacitors in the connector mounting part of the printed circuit board at the circuit design stage, the change in the circuit layout after the circuit design is completed is significantly reduced, and it can be used for high density mounting printed circuit boards. It has an effect of easy application.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a connector according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a connector showing a modified example of the first embodiment.

FIG. 3 is a perspective view showing a connector according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a connector showing a modified example of the second embodiment.

FIG. 5 is a perspective view of a connector showing another modification of the second embodiment.

FIG. 6 is a cross-sectional view of a connector showing another modification of the second embodiment.

FIG. 7 is a perspective view showing a connector according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional view of a connector showing a modification of the third embodiment.

FIG. 9 is a plan view showing a connector according to a fourth embodiment of the present invention.

FIG. 10 is a perspective view of a connector showing a modified example of the fourth embodiment.

FIG. 11 is a perspective view of a connector showing another modification of the fourth embodiment.

FIG. 12 is a perspective view of a printed circuit board used in an experiment on which the present invention is based.

13 is a diagram showing characteristics of unnecessary electromagnetic wave radiation from the printed circuit board shown in FIG.

FIG. 14 is a mounting structure diagram of a printed circuit board and a housing according to a conventional technique.

FIG. 15 is a cross-sectional view of a connector according to the related art.

FIG. 16 is a structural diagram of a connector according to the related art.

FIG. 17 is a mounting diagram of a power supply decoupling capacitor on a printed circuit board according to a conventional technique.

[Explanation of symbols]

1,11,21,21 ', 31,31', 41,4
1 ', 51,54,54' Connector 2,42 Printed circuit board 3,13,26,26 ', 33,33', 43 pin 4,14,22,22 ', 32,32', 45,4
5 ', 50,55,55' housing 5 capacitors (power supply decoupling capacitors) 6,16,23,23 ', 34,34', 47,4
7 ', 53, 58, 58' pad (capacitor mounting pad) 7, 48 pin hole 8 pad (power supply / ground wiring short-circuit pad) 24, 57 conductor 25 pad (contact pad) 32a edge 34a ', 58a 'Contact part 44,44', 52,56,56 'Pin (capacitor mounting pin) 49 pin hole (power supply / ground wiring short-circuit pin hole)

Claims (11)

[Claims] 1. An interface cable connector for mounting an interface cable on a printed circuit board, comprising: a plurality of pins; a housing for fixing the pins; and a capacitor embedded in the housing.
A pad formed so as to be electrically connected to electrodes on both ends of the capacitor on a contact surface with the printed circuit board, and the pad is contacted with the printed circuit board when the pad is attached to the printed circuit board. An interface cable connector characterized in that a structure is in contact with a pad formed by being electrically connected to a power supply wiring layer and a ground wiring layer on the surface. 2. An interface cable connector for mounting an interface cable on a printed circuit board for connecting an interface cable, a plurality of pins, a housing for fixing the pins, a pad for mounting a capacitor, and The pad has another pad formed on the contact surface with the printed circuit board by being electrically connected to the pad via a conductor, and the other pad is attached to the printed circuit board when the other pad is attached to the printed circuit board. An interface cable connector characterized in that the contacted surface is in contact with a pad formed by being electrically connected to a power supply wiring layer and a ground wiring layer. 3. An interface cable connecting connector for mounting an interface cable on a printed circuit board, comprising: a plurality of pins; a housing for fixing the pins; and a printed circuit board from a side surface of the housing. A pad formed around the contact surface to enable mounting of a capacitor, the pad being electrically connected to the contact surface of the printed circuit board with the power supply wiring layer and the ground wiring layer when mounted on the printed circuit board. A connector for connecting an interface cable, which is characterized in that it has a structure of contacting a pad formed by being electrically connected. 4. An interface cable connector for mounting an interface cable on a printed circuit board, comprising: a plurality of pins; a housing for fixing the pins and having an edge on a contact surface with the printed circuit board; A pad formed to enable mounting of a capacitor on the edge, and when the pad is mounted on the printed circuit board, the pad electrically connects to a contact surface of the printed circuit board with a power supply wiring layer and a ground wiring layer. A connector for connecting an interface cable, which is characterized in that it is connected to the pad and comes into contact with the pad formed. 5. An interface cable connecting connector for mounting on a printed circuit board to connect an interface cable, wherein a plurality of pins are fixed, and a recess for mounting a capacitor is formed on a contact surface with the printed circuit board. And a pad that is formed around the contact surface with the printed circuit board by the plate-spring-shaped conductor piece and wraps around the capacitor mounting recess, and allows the capacitor to be embedded and mounted in the capacitor mounting recess. The capacitor is fixed in the capacitor mounting recess by the elasticity of the pad when the capacitor is mounted, and the pad is attached to the contacted surface of the printed circuit board when the capacitor is mounted on the printed circuit board. Formed by being electrically connected to the power and ground wiring layers Connector interface cable connection, characterized in structure in contact with the pad on. 6. An interface cable connector for mounting an interface cable on a printed circuit board, comprising: a plurality of pins; a housing for fixing these pins; and a capacitor for connecting between specific adjacent pins. And a structure in which the specific adjacent pin is inserted into a pin hole formed by being electrically connected to the power supply wiring layer and the ground wiring layer on the printed circuit board when mounted on the printed circuit board. Connector for interface cable connection. 7. An interface cable connector for mounting an interface cable on a printed circuit board, wherein a plurality of pins, a housing for fixing these pins, and a pin adjacent to a specific or all pins are provided. A pad formed so that a capacitor for connection can be mounted, and the adjacent pins are electrically connected to the power supply wiring layer and the ground wiring layer on the printed circuit board when mounted on the printed circuit board. An interface cable connector characterized by being inserted into a pin hole formed by being connected. 8. An interface cable connector for mounting an interface cable on a printed circuit board, comprising: a plurality of pins; a housing for fixing these pins; and a pin adjacent to a specific pin or all the pins. A pad formed to enable mounting of a capacitor for connecting the capacitor, exposing the pad on a side surface of the housing, and electrically connecting the pad and the pin using a conductor. A connector for connecting an interface cable, characterized in that the capacitor can be mounted on the side surface of the housing. 9. An interface cable connecting connector for mounting on a printed circuit board to connect an interface cable, wherein a plurality of pins are fixed, and a recess for mounting a capacitor is bored on a contact surface with the printed circuit board. The housing and the leaf spring-shaped conductor piece are formed so as to wrap around the capacitor mounting recess from the contact surface with the printed circuit board, and the capacitor can be embedded and mounted in the capacitor mounting recess, and the plurality of capacitors can be mounted. A pad electrically connected to a specific one of the pins, and in a state where the capacitor is mounted, the capacitor is fixed in the capacitor mounting recess by elasticity of the pad, and the print The specific pin is attached to the printed circuit board when mounted on the circuit board. Connector interface cable connection, wherein the structure is inserted into the pin holes formed by the power supply wiring layer and the ground wiring layer electrically connected to the contact surface. 10. In a structure for mounting an interface cable connecting connector for connecting an interface cable to a printed circuit board, a pad connected to a capacitor built in the connector or another pad connected to this pad, An attachment structure characterized in that a contact surface of the printed circuit board is in contact with a pad formed by being electrically connected to a power supply wiring layer and a ground wiring layer. 11. In a structure for mounting an interface cable connecting connector for connecting an interface cable to a printed circuit board, a pin connected to a capacitor built in the connector or a pin connected to a capacitor mounting pad is provided. A mounting structure characterized by being inserted into a pin hole formed by being electrically connected to a power supply wiring layer and a ground wiring layer on the printed circuit board corresponding to the pin.