JP2639364B2 - connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector for connecting devices to each other via an electric cable.

[0002]

2. Description of the Related Art Conventionally, transmission using various types of cables has been performed in an electrical interface between such devices. In general, many signals are transmitted in parallel, and there are many cases where signals are multi-core. In particular, when the transmission line length is long, the cable is often charged when the cable is laid, and the charged charge is discharged when the cable is connected, and the possibility that the IC used in the interface is destroyed is also increased. .

In order to solve this problem, Japanese Patent Laid-Open Publication No.
No. 75 discloses an electrostatic induction terminal formed on the surface of a connector portion of a printed circuit board. Since the connector portion 5 has an electrostatic induction terminal having a low impedance with respect to static electricity, if static electricity accumulated in the human body jumps to the connector portion immediately before the human body touches the connector portion, the static electricity does not fly to the connector pattern. It is guided to the static electricity induction terminal.

[0004]

In this prior art,
The problem is not solved on the premise that static electricity accumulated in the human body flies to the connector portion and the cable is charged when the cable is laid. For this reason, the static electricity induction terminals are formed between both ends of the connector section 5 and the connector pattern 8. This can destroy the IC used in the interface before the charged charge flows to ground or to a metal case when consumed when inserting or attaching the cable.

An object of the present invention is to provide a connector which prevents the destruction of an IC used in an interface due to a charge on a cable.

It is another object of the present invention to provide a connector which discharges a charge on a cable without being conscious of the cable when connecting the cable.

It is another object of the present invention to provide a connector which can be replaced while power is being supplied.

[0008]

According to a first connector of the present invention, a cable-side connector having a connection portion comprising at least one of a connection terminal and a connection pad electrically connected to a cable; When the connection portion is provided at a position where the connection portion comes into contact with the connection portion, and a short end portion composed of at least one of a short pad and a short terminal connected to the device side ground, and the cable side connector is connected, the connection is performed. A device-side connector having a signal transmission pad and a signal end comprising at least one of a terminal provided at a position where the portion does not contact the short-circuited end after contacting the short-circuited end. The connector of No. 2 includes a power supply pin in the cable of the first connector, and the device-side connector includes the power supply pin. The power supply end for receiving a supply voltage et is provided, wherein when the cable-side connector is connected, characterized in that the connection part connected to the power supply pin is arranged the short end so as not to contact.

In a third connector of the present invention, the short end of the first connector includes a plurality of short terminals, the plurality of short terminals are electrically connected to each other, and the plurality of short terminals are connected to each other. At least one of the terminals is connected to a ground on the device side.

In a fourth connector of the present invention, in the first connector, the device-side connector is formed of a printed wiring board, the short end is formed of a short pad, and the signal end is formed of the signal transmission line. And the connection portion of the cable-side connector is formed by the connection terminal.

According to a fifth connector of the present invention, in the first connector, the cable-side connector is formed of a printed wiring board, and the connection portion is formed of the connection pad.
The short-circuited end of the device-side connector is constituted by a short-circuited terminal, and the signal end is constituted by the signal-transmitting terminal.

[0012]

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

Before describing an embodiment of the present invention, charging of a cable and destruction of a semiconductor element such as an IC used for an interface will be described with reference to FIG.

Referring to FIG. 4, three signal lines 1 are now provided.
Assume a cable composed of 4, 15 and 16.

In particular, when the cable is long, the cable is charged due to mechanical deformation of the cable, and charges 17, 18 and 19 are charged. In a state where the cable is not connected, there is no place where these charges are discharged, so that the cable remains charged. If the connection is made in this state, discharge is performed from one of the inputs of the ICs 20, 21 and 22 of the connected device to the ground GND 23, and the semiconductor element such as an IC is destroyed. It is a feature of the present invention that the discharge path 25 at this time is changed to the ground 23 on the connector to prevent destruction of a semiconductor element such as an IC.

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

Referring to FIGS. 1A and 1B, a first embodiment of the present invention includes a connector 1 on the device side constituted by a printed wiring board and a cable connector 2 connected to a cable 3. ing.

The cable connector 2 has a pad 5 on the device side 1.
The cable side connection terminal 6 is provided at a position corresponding to.
This terminal is connected to pad 5 so that pad 5 is sandwiched from both sides.
Is preferably provided on both the front surface and the back surface. However, one terminal can be substituted for the housing of the cable connector 2. On the other hand, the connector 1 is electrically connected to the signal through-hole 5 'existing in the related art and to the signal through-hole 5' via, for example, a conductor on a printed wiring board or a signal layer in the wiring board. Pads 5 provided on the front and back surfaces; positions on the front surface of the pads 5, that is, positions where the cable-side connection terminals 6 can come into contact before the pads 5 on both surfaces on the wiring board serving as the connector 1 when the cable connector 2 is inserted. And a short pad 4 provided thereon; and electrically connected to the short pad 4 via, for example, a conductor portion on a printed wiring board or a signal layer in the wiring board, and to a frame ground which is a ground on the device side. Frame ground through hole 4 '.

Next, the connection operation of the connectors 1 and 2 according to the first embodiment of the present invention will be described in detail.

Referring to FIGS. 1A and 1B, when the connector 1 is inserted into the connector 2, the cable side terminal is connected to the short pad 4 connected to the frame ground.
Is always first connected electrically. If the electric charge is charged on the cable 3, the electric charge is discharged from the cable side terminal 6 to the frame ground via the short pad 4 by this connection.

All pins are connected to the inside of the device from the frame ground through hole 4 'in an appropriate pattern on the printed wiring board 1. All pins are connected from the connection terminals 6 to signal lines in the cable 3 in an appropriate pattern.

In the first embodiment of the present invention, after the electric charge is discharged, the electric charge is discharged from the cable 3 and the conductive pad 5 which is a regular connection portion and the connection terminal 6 are connected in this state. No overvoltage is applied to the IC in the interface on the device side. Further, when the connector is finally connected, the short pad 4 does not come into contact with the connection terminal 6, and there is no possibility that the signal is short-circuited.

Further, in the first embodiment of the present invention, since this structure is provided, when connecting the connector, the charged electric charge is discharged during the operation of connecting the cable without being conscious of whether the cable is charged. can do.

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

Referring to FIGS. 2A and 2B, a feature of the second embodiment of the present invention is that the connector 1 is different from the first embodiment in that a part of the signal connection pad 5 is used. The power supply pad 7 is provided, and the short pad 4 is not provided at a position in front of the power supply pad 7. On the cable connector 2 side, the cable side connection terminal 6 of the first embodiment is provided at a position corresponding to the power supply pad 7. Instead, a power supply connection terminal 7 'is provided. That is, the second embodiment is based on the assumption that there is a power supply line in the signal line. In the first embodiment, when the power supply wiring is included in the signal lines, the power supply may be short-circuited when the cable connector 2 is inserted into the connector 1 on the device side. That is, it is assumed that one side of the cable 3 is already connected to the device and power is supplied to the power supply connection terminal 7 ′ of the cable connector 2. In such a state, when the power supply connection terminal 7 'and the short pad 4 are electrically connected, the power supply and the ground may be short-circuited. In order to prevent this short-circuit, a configuration is adopted in the second embodiment in which when the cable connector is inserted into the connector 1, the power supply connection terminal 7 'does not contact the short pad 4 before contacting the pad 7. That is, one of the features of the second embodiment is that the short pad 4 is not arranged on the path for inserting the power supply connection terminal 7 'into the pad 7.

In the second embodiment of the present invention, the cable itself has a power supply pin, which is effectively used when power is supplied when the cable is connected or when parts are replaced while the power is being supplied.

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

Referring to FIGS. 3A and 3B, a feature of the third embodiment of the present invention is that the connector 9 on the apparatus side can cope with the cable connector 8 even if the cable connector 8 is formed of a printed wiring board. is there.

The cable connector according to the third embodiment of the present invention includes a cable 10, a printed board 8 having connection pads 11 on both sides, and a connector 14 for connecting the cable 10 and the printed board 8. On the other hand, the connector 9 on the device side is on a connection terminal 12 for transmitting a signal from the connection pad 11 and on a path of insertion of the printed board 8 of the connector into the connection terminal 12, and a connection terminal when the printed board 8 of the connector is inserted. A short terminal 13 is provided at a position where the short terminal 13 comes into contact before the contact of the terminal 12.

Although not shown, this short terminal 1
Numeral 3 is electrically connected to the ground terminal of the device via the housing of the connector 9 or another conductor.

The short terminals 13 are electrically connected to each other.

The connection operation of the third embodiment of the present invention is performed as follows.

Referring to FIG. 3, when a connector for signal transmission is connected, the connection pad 11 of the connector on the cable 10 contacts the short terminal 13 of the connector 9 on the device side. When the cable 10 is charged, these charges are discharged to the frame ground, which is the device-side ground, via the connection pads 11 and the connection terminals 13. After the electric charge charged on the cable 10 side disappears, the connection pad on the printed circuit board 8 is connected to the connection terminal 12 of the connector 8 to the regular connection terminal 12, and a semiconductor element such as an IC provided on the device side is mounted. Can be connected without electrostatic damage. Further, in the third embodiment of the present invention, the short terminal 13 does not come into contact with the connection pad 11, and does not short-circuit after the connection of the connector is completed.

[0034]

According to the present invention, connection is achieved by disposing a short pad or a short terminal connected to the ground on the device side in the connector at a position where the short pad or the short terminal temporarily contacts the terminal of the connector on the cable side before connecting the connector. It is possible to discharge the electric charge on the cable regardless of the number of signal pins and whether the signal line is coaxial or single line, without being aware of the situation. Therefore, the present invention can prevent electrostatic breakdown of a semiconductor element such as an IC used in an interface.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a first embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing a second embodiment of the present invention.

FIGS. 3A and 3B are diagrams showing a third embodiment of the present invention.

FIG. 4 is a diagram for explaining a relationship between charging of a cable and electrostatic breakdown of a semiconductor element.

[Explanation of symbols]

 1, 9 Device side connector 2 Cable side connector 3, 10 Cable 4 Short pad 4 'Frame ground through hole 5, 11 Pad 5' Signal through hole 6, 12 Connection terminal 7 Power supply pad 7 'Power supply connection terminal 8 Printed wiring board 13 Short terminal

Claims (2)

(57) [Claims] 1. A cable-side connector having a connection portion comprising at least one of a connection terminal and a connection pad electrically connected to a cable, and provided at a position where the connection portion comes into contact when the cable-side connector is connected. A short end comprising at least one of a short pad and a short terminal connected to the ground on the device side; and, when the cable side connector is connected, the short end after the connection portion contacts the short end. look including a device side connector having a signal end of at least one of the pads and terminals provided signals for transmission to a position where it does not contact the part, the cable includes a power pin, the device-side connector is the Power supply voltage from power supply pin
A power supply end for receiving the power supply pin when the cable side connector is connected.
Connect the short end so that the connected part does not touch
A connector characterized by being arranged . 2. A plurality of shorts constituting the short end.
And the plurality of short terminals are electrically connected to each other.
At least one of the terminals is connected to the ground on the device side
The connector according to claim 1, wherein the connector is formed.