JP3087180U - Multi-terminal connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector having a multi-terminal with a simple configuration, which can reliably discharge static electricity having different wavelengths to the ground side and has a small number of parts. SOLUTION: A plurality of plug-in terminals 9 are exposed on the opening side of a fitting section into which a male connector at a cable end connected to a signal output section is inserted.
A multi-terminal connector connected to the signal transmission lines 11 through the anodes of the zener diodes ZD for discharging static electricity to each of the signal transmission lines 11; Are connected in parallel between an electric field capacitor C1 and a capacitor C for releasing static electricity having different wavelengths between a connection point P to which a common connection is made and a ground E side.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a connector with multiple terminals for connecting electronic devices to each other with a cable, and more specifically, to a connector with multiple terminals that can prevent static electricity from entering an internal circuit of the electronic device when plugged in. About.

[0002]

[Prior art]

 Since circuit elements of electronic devices are generally formed of semiconductors such as ICs and LSIs, there is a problem that when high-voltage static electricity enters these devices, they are destroyed or malfunctions of the electronic devices are caused. In view of this, various proposals have conventionally been made for this countermeasure against static electricity, and as one example, an electronic device with a clock is known (see Japanese Patent Application Laid-Open No. 59-107287). In this device, the ground line is connected to the case, and devices such as capacitors and zener diodes are connected between the external terminal and the ground line to release static electricity. Also proposed is an electronic device that has a printed circuit board with a pattern wiring, connects a Zener diode between the discharge path of static electricity that enters from the outside of the device body and ground, and discharges through this Zener diode. (See JP-A-61-58199).

[0003] However, when static electricity is accumulated in an output section or a signal cable of a signal transmission cable for some reason, when the signal pins are connected to the input section, these electronic apparatuses have an input section. The problem of malfunctioning ICs and the like in internal circuits due to discharge of static electricity could not be avoided. Therefore, a connector for preventing static electricity from entering an internal circuit of an AV device has been proposed (see Japanese Patent Application Laid-Open No. 3-187171). In the case of a signal code from which an electrostatic charge may be accumulated among the signal codes from the output unit, a cathode is connected to the signal code and the signal code of the signal code from the output unit is connected. Of these, a diode is provided to connect the anode to the signal code maintained at the reference potential. In addition, there is provided a means for preventing the electrostatic charge of the output unit from being discharged through the input unit at a connection point of the connector and preventing a malfunction due to discharge at the time of connection of the connector. For this reason, electrostatic charges accumulated as noise can be prevented from being discharged to the input unit, and an IC or the like in an electronic device connected with a simple configuration can be protected.

As an example of a connector capable of avoiding the problem of static electricity entering an internal circuit during plug-in connection, a multi-terminal connector having a shape as shown in FIG. 3 is known. This multi-terminal connector is a 21-pin type of European specification. The male connector 1 is plugged into the female connector 2, and the TV and the VTR are mutually connected by the cable 3. The male connector 1 has a metal fitting part 2 integrated with an end face of a connector cover 1a having an insulating property. A plurality of insertion pin terminals 3 are fixed in the fitting portion 2 with an insulator. Each of the insertion pin terminals 3 has its distal end exposed from the opening 2a side of the fitting portion 2, and the signal transmission line of the cable 4 is connected to each rear end.

On the other hand, the female connector 7 is attached to the panel 6 of the VTR main body 5. The panel 6 has insulating properties, and has a connector mounting hole on the rear side surface. A metal fitting portion 8 having a size smaller than that of the fitting portion 2 of the male connector 1 is integrally attached to the connector mounting hole. In the fitting portion 8, a plurality of insertion terminals 9 are fixed via an insulator. These plug-in terminals 9 are pin-shaped metal cylinders into which the plug-in pin terminals 3 are inserted. Each of the plug-in terminals 9 has its front end exposed through the opening 8a of the mating portion 8 and each rear end shown in FIG. As shown, the wiring patterns 11 (signal transmission lines) are respectively connected.

The wiring patterns 11 are formed on the printed circuit board 10 and correspond to the signal transmission lines on the cable 4 side. A resistor R is connected to one end and a signal R is connected to the other end. It is connected to an input unit (not shown). The wiring pattern 11 transmits L and R audio signals, video signals, and other various control signals. In this example, the audio signal, the video signal, and the control signal are transmitted from one end (upper side of the paper) of the printed circuit board 10. They are arranged side by side in the order of the signals. An electrostatic protection circuit 13 is provided between each resistor R and the signal input unit. The electrostatic protection circuit 13 includes a plurality of pairs of Zener diodes ZD1 and ZD2, and the Zener diodes ZD1 and ZD2 of each pair have their anodes connected to each other. The cathode of one zener diode ZD1 is connected to the resistor R, and the cathode of the other zener diode ZD2 is connected to the ground E.

Thus, when the male connector 1 provided at the end of the cable 4 is plugged into the female connector 7 of the VTR main body 5, if a finger charged with static electricity touches the female connector 7, The wire enters the wiring pattern 11 from the inserted terminal 9 side. Here, since the zener diode ZD1 is provided in each wiring pattern 11, a high voltage equal to or higher than the breakdown voltage of the zener diode ZD1 does not flow to the ground E side and enter the signal input unit side. Even if static electricity or noise flows from the ground E side, a high voltage higher than the breakdown voltage of the Zener diode ZD2 does not enter the signal input section. Therefore, the internal circuit of the VTR is not affected by static electricity or noise, and destruction of circuit elements and occurrence of malfunction are prevented.

[0008]

[Problems to be solved by the invention]

 By the way, the former of the above-mentioned conventional connectors discharges the static electricity accumulated in the output section and the signal cable to the signal cable side maintained at the reference potential by the diode, but does not directly escape to the ground side. It was not possible to avoid the problem of static electricity of different high voltage entering the input section. In the latter multi-terminal connector, since a pair of zener diodes ZD1 and ZD2 are connected to the ground E side for each signal transmission line, high-voltage static electricity can escape to the ground E side. Since a large number of pairs of diodes ZD1 and ZD2 are required, there remains a problem that the circuit configuration becomes complicated and the number of parts increases.

The present invention has been made in view of the above-mentioned problem, and it is possible to reliably discharge static electricity having different wavelengths to the ground, and to provide a connector with a small number of parts and a simple configuration with multiple terminals. It is intended to provide.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, according to the present invention, a plurality of insertion terminals are exposed on the opening side of a fitting portion into which a male connector at a cable end connected to a signal output portion is inserted. In a multi-terminal connector in which a signal transmission line is connected to these inserted terminals via a resistor, an anode of a Zener diode for discharging static electricity is connected to each of the signal transmission lines. In addition, an electric field capacitor and a capacitor for discharging static electricity having different wavelengths are connected in parallel between a connection point where the cathode sides of these zener diodes are commonly connected and an earth side.

The invention according to claim 2 is such that a plurality of insertion terminals are exposed on the opening side of the fitting portion into which the male connector at the end of the cable connected to the signal output portion is inserted. In a multi-terminal connector in which a signal transmission line is connected to a connection terminal via a resistor, one end of an electric element for supplying a voltage equal to or higher than a predetermined voltage is connected to each of the signal transmission lines. An electric field capacitor and a capacitor are connected in parallel between a connection point where the other ends of the elements are commonly connected and a ground side. The invention according to claim 3 is characterized in that the electric element is a Zener diode, and constitutes a circuit for discharging static electricity to the ground side together with the electric field capacitor and the capacitor.

[0012]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the illustrated examples. FIG. 1 is an electric circuit diagram showing a connector with multiple terminals according to an embodiment of the present invention. This multi-terminal connector has substantially the same basic configuration as the 21-pin type connector shown in FIG. 3, and the same portions are denoted by the same reference numerals and different portions will be described in detail. In FIG. 1, reference numeral 7 denotes a female connector. Wiring patterns 11 of a printed circuit board 10 are connected to 21 insertion terminals 9 respectively. These wiring patterns 11 correspond to the signal transmission lines of the cable 4 shown in FIG. 3, and each end is connected to a resistor R, and the other end is connected to a signal input unit (not shown). .

The wiring patterns (signal transmission lines) 11 are also arranged in order of an audio signal, a video signal, and a control signal from one end side (upper side of the paper) of the printed circuit board 10. An electrostatic protection circuit 12 is provided between each resistor R and the signal input unit. The static electricity protection circuit 12 includes a plurality of Zener diodes ZD and capacitors C1 and C2. Each Zener diode ZD has an anode connected to a resistor R and a cathode connected in common. An electric field capacitor C1 and a capacitor C2 are connected in parallel to the common connection point P. These capacitors C1 and C2 are for discharging static electricity having a wide range of different wavelengths. One end is connected to a common connection point P, and the other end is connected to the ground E side.

Thus, when the male connector 1 provided at the end of the cable 4 is inserted and connected to the female connector 7 of the VTR main body 5, if a finger charged with static electricity touches the female connector 7, The wire enters the wiring pattern 11 from the inserted terminal 9 side. Here, since a zener diode ZD is provided in each wiring pattern 11, a high voltage equal to or higher than the breakdown voltage of the zener diode ZD flows to the ground E side via the capacitor C1 or C2 and flows to the signal input section side. No intrusion. At this time, static electricity having different wavelengths is released to the ground E side through the capacitors C1 and C2. Even if static electricity or noise flows from the ground E side, the static electricity or noise is cut by the capacitors C1 and C2 and is prevented by the zener diode ZD so as not to enter the signal input section. Therefore, the internal circuit of the VTR is not affected by static electricity or noise, and destruction of circuit elements and occurrence of malfunction are prevented.

In the above-described embodiment, the Zener diodes ZD are connected to all the wiring patterns (signal transmission lines) 11 including the audio signal, the video signal, and the control signal, respectively, so that the static electricity protection circuit 12 is connected. However, a circuit configuration may not be provided on the signal transmission line 11 that is not affected by static electricity or noise. In addition, the electrostatic protection circuit 12 is not limited to a connector for connecting AV devices to each other, but can be widely applied to a connector for connecting an electronic device having a small number of plugged-in terminals.

[0016]

[Effect of the invention]

 As described above, according to the first aspect of the present invention, when the male connector on the cable side is inserted and connected to the fitting portion, a finger that is charged with static electricity at the fitting portion or the terminal to be inserted is provided. When touching, all static electricity of different voltage and higher voltage than the breakdown voltage of the Zener diode flows to the ground side, so the static electricity is not guided to the signal transmission line side and applied to the internal circuit. This has the effect of preventing the problem that the electric element such as a semiconductor constituting the semiconductor device is broken and breaks down or causes a malfunction. In addition, the invention according to claim 2 is that when the male connector on the cable side is plugged into the fitting portion, when the fitting portion or the inserted terminal is touched by, for example, a finger charged with static electricity, Since all static electricity of different voltage and higher voltage than the breakdown voltage of the Zener diode flows to the ground side, the static electricity is not guided to the signal transmission line side and applied to the internal circuit. This has the effect of preventing a problem that the electric element is broken and breaks down or causes a malfunction. According to the third aspect of the present invention, since the electric element is a Zener diode and constitutes a circuit for discharging static electricity to the ground side together with the electric field capacitor and the capacitor, the electric element is provided for each signal transmission line as in the conventional case. There is no need, and there is an advantage that electrostatic disturbance can be prevented with a simple configuration.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing a connector with multiple terminals according to an embodiment of the present invention.

FIG. 2 is an electric circuit diagram showing a conventional connector.

FIG. 3 is an explanatory diagram showing a connection state of a connector.

[Explanation of symbols]

 9 Inserted terminal 11 Signal transmission line ZD Zener diode C1 Electric field capacitor C capacitor

Claims (3)

[Utility model registration claims] A plurality of plug-in terminals are exposed on the opening side of a fitting portion into which a male connector at a cable end connected to a signal output portion is inserted, and the plug-in terminals are connected to a signal via a resistor. In the connector with multiple terminals to which the transmission lines are connected, to each of the signal transmission lines, an anode of a zener diode for discharging static electricity is connected, and a connection point where the cathode side of these zener diodes is commonly connected, and a ground side. A connector with multiple terminals, wherein an electric field capacitor for discharging static electricity having different wavelengths and a capacitor are connected in parallel. 2. A plurality of plug-in terminals are exposed on an opening side of a fitting portion into which a male connector at a cable end connected to a signal output portion is inserted, and the plug-in terminals are connected to a signal via a resistor. In the connector with multiple terminals to which the transmission lines are connected, to each of the signal transmission lines, one end of an electric element for supplying a voltage equal to or higher than a predetermined voltage is connected, and the other end of the electric element is connected to a connection point. A connector with multiple terminals, wherein an electric field capacitor and a capacitor are connected in parallel with the earth side. 3. The connector with multiple terminals according to claim 2, wherein the electric element is a Zener diode, and forms a circuit for discharging static electricity to a ground side together with the electric field capacitor and the capacitor.