JP2008277133A - Terminal for video signal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal for a video signal capable of selectively connecting a cable which can transmit or receive at least two signals among a composite signal, an S composite signal, and a component signal. <P>SOLUTION: The terminal for the video signal has a case 121, a grounding section 122, a first connection section 123, and a second connection section 124. The first connection section 123 has a contact section 1231 brought into contact with a pin of a plug inserted into a receptacle 12, an elastic arm section 1232 integrally formed on the contact section 1231, a contact section 1233 formed on the tip of the arm section 1232, and an insulating pushing member 1234 mounted on the arm section 1232, and also has a first switching connection section 1235 and second switching connection section 1236 in the vicinity of the contact section 1233 of the first connection section 123. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a detachable video signal terminal attached to the end of a cable for transmitting and receiving a video signal between video devices.

  When AV devices are connected to transmit and receive video signals and / or audio signals, they are often connected using cables. Various AV terminals for connecting the video equipment and the cable are known. As the AV terminal, for example, a composite terminal, an S terminal, a component terminal, and the like are often used. The composite terminal is mainly used for VHS, and the S terminal is used for S-VVHS video. The component terminals divided into three are used for connection of more advanced AV equipment.

  These AV terminals include a plug attached to the end of the cable and a receptacle attached to the AV device, and are connected by inserting the plug into the receptacle. The plug of the composite terminal is formed in a so-called pin plug shape having one pin protruding at the center. On the other hand, the S terminal has a plug shape in which four thin pins protrude from an asymmetrical position.

  The component signal includes three independent terminals, a Y (luminance signal) terminal, a Cr (color difference signal) terminal, and a Cb (color difference signal) terminal.

Currently, a plurality of these AV terminals are mounted on AV devices, and can be connected to a plurality of external devices. Some devices automatically determine the type of terminal to which an AV device is connected and perform an operation according to a signal sent from the connected terminal. (See JP-A-11-313253 and JP-A-8-79636).
See JP-A-11-313253 See JP-A-8-79636

  Many current AV devices have both a composite terminal and an S terminal for one input or output system, and either one is selected and a cable is connected. In this case, the terminal to which the cable is not connected is not only wasted, but the installation area of the terminal is increased, which prevents the AV device from being downsized. .

  In addition, when the component terminal is provided, as described above, the component terminal requires three terminals of Y terminal, Cb terminal, and Cr terminal for one input or output system, and a large installation place is required.

  Usually, in an AV device, the number of component terminals installed is small due to the installation location and cost. Even if a plurality of external AV devices are connected to such an AV device with component terminals, the number of component terminals may be insufficient. In such a case, the connection must be made using a composite terminal having poor image quality.

  Therefore, an object of the present invention is to provide a video signal terminal capable of selectively connecting a cable capable of transmitting or receiving at least two signals among a composite signal, an S composite signal, and a component signal. .

  In order to achieve the above object, the present invention provides a video signal terminal having a receptacle into which a plug is inserted, a first signal transmitting unit for transmitting a first signal, and a second signal for transmitting a second signal. A transmission unit and a third signal transmission unit for transmitting a third signal; when no signal is transmitted to the third signal transmission unit, electrically connect to the first signal transmission unit; And a first switching connection portion that is elastically deformed by the plug and electrically connected to the second signal when a signal is transmitted to the third signal.

  According to this configuration, it is possible to connect plugs attached to cables having different signals to be transmitted with one receptacle.

  This eliminates the need to prepare different types of video signal connection terminals for each AV device to be connected, and is therefore more efficient.

  In the above configuration, the receptacle includes a plug having a pin having a main body portion to which the first signal is transmitted, or a main body portion to which the second signal is transmitted, and the third signal is provided at the center of the tip of the main body portion. Any one of plugs having pins with protrusions to be transmitted is inserted, the third signal transmission part is in contact with the protrusions, and the first switching connection part is conductive. An abutting portion that abuts on the main body portion, a lever portion that is formed integrally with the abutting portion and elastically deforms, and is formed at a tip of the lever portion, and is configured to be the first signal transmitting portion or the second signal. A contact portion that contacts the transmission portion; and a pressing portion that is insulated and attached to the lever portion, and the lever portion is elastically deformed when the pressing portion is pressed by the projecting portion. The contact portion is electrically connected to the second signal transmission portion. Or it may be in contact with the.

  According to this configuration, signals can be switched mechanically depending on the shape of the plug, and a circuit for switching need not be configured.

  In the above configuration, the first signal is a composite signal, the second signal is either a luminance signal or a color signal, and the third signal is a signal different from the second signal in the luminance signal or the color signal. I can give you something.

  In the above configuration, the first signal transmission unit and the second signal transmission unit include a fourth signal transmission unit that transmits the fourth signal and a fifth signal transmission unit that transmits the fifth signal. When no signal is transmitted to either of the first signal transmitting unit and the second signal transmitting unit, the signal is transmitted to either the first signal transmitting unit or the second signal transmitting unit. The second switching connection portion that is elastically deformed by the plug and electrically connected to the fifth signal transmission portion may be provided.

  According to this configuration, a cable that handles more signal types can be connected by a single receptacle.

  In the above configuration, the receptacle includes a first plug having a pin having a main body portion to which the fourth signal is transmitted or a main body portion to which the fifth signal is transmitted, and the first plug at the center of the front end of the main body portion. A second plug having a pin with a projecting portion to which a signal is transmitted, or a main body portion to which the fifth signal is transmitted, a middle portion projecting from a tip of the main body portion and transmitting the second signal, Any one of the third plugs protruding from the front end of the middle stage portion and having a front end portion to which the third signal is transmitted is inserted, and the third signal transmitting portion is in contact with the front end portion, and 1 switching connection part, the 1st contact part which contact | abuts the said protrusion part or middle step part, the 1st lever part which is integrally formed with the said 1st contact part, and elastically deforms, The front-end | tip of the said 1st lever part Formed in the first signal transmission unit or the second signal transmission unit. A first contact portion that contacts the signal transmission portion, and a first pressing portion that is insulated and attached to the first lever portion, and the second switching connection portion is in contact with the main body portion. 2 abutting portions, a second lever portion formed integrally with the second abutting portion and elastically deformed, and formed at the tip of the second lever portion, the fourth signal transmitting portion or the fifth signal transmitting A second contact part that contacts the part and a second pressing part that has insulation and is attached to the second lever part, and when the first plug is inserted, the first switching connection When the first contact part is in electrical contact with the first signal transmission part and the second plug is inserted, the first switching connection part is connected to the tip part of the first pressing part. The first lever portion is elastically deformed and the first contact portion is electrically connected to the second signal transmitting portion. The second switching connection portion is electrically connected to the back of the fourth signal transmission portion, and when the third plug is inserted, the first switching connection portion is connected to the first switching connection portion. The pressing portion is pushed by the middle step portion, the first lever portion is elastically deformed, the first contact portion is electrically contacted with the second signal transmitting portion, and the second switching connection portion is The second pressing portion may be pushed by the tip portion, whereby the second lever portion may be elastically deformed and the second contact portion may be electrically connected to the fifth signal transmission portion.

  In the above configuration, the first signal is a color signal, the second signal is either a Cb signal or a Cr signal, and the third signal is a Cb signal or a Cr signal that is different from the second signal. The fourth signal may be a composite signal, and the fifth signal may be a luminance signal.

  According to the present invention, it is possible to provide a video signal terminal capable of selectively connecting a cable capable of transmitting or receiving at least two signals among a composite signal, an S composite signal, and a component signal.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of a video signal terminal according to the present invention. The video signal terminal shown in FIG. 1 is an input terminal here, although not limited thereto. The video signal terminal 1 is a terminal used to connect the cable and the AV device when different AV devices are connected to each other via the cable 2. The AV device shown in FIG. 1 is a DVD recorder 3 here, although not limited thereto.

  The video signal terminal 1 has a receptacle 12 into which a plug 11 attached to the cable 2 can be inserted and is attached to the DVD recorder 3. The video signal terminal 1 is used when the cable 2 for transmitting the color signal C and the luminance signal Y using separate signal lines is connected to the DVD recorder 3.

  FIG. 2 is a sectional view of the plug of the video signal terminal shown in FIG. As shown in FIG. 2, the plug 11 includes a hollow exterior member 111 made of resin, a conductive cylindrical portion 112 that is inserted into the exterior member 111 and partially protrudes from the exterior member 111, and an exterior member 111. A main body pin 113 having the same central axis as the cylindrical portion 112 that is inserted and partially protruding from the exterior member 111, and a protruding pin 114 that is formed with a smaller diameter than the main body pin 113 and protrudes from the distal end portion of the main body pin 113. Have.

  The body pin 113 is formed with the same diameter as a pin of a pin plug used conventionally. The body pin 113 has a cylindrical shape with a larger diameter than the protruding pin 114. The protruding pin 114 is disposed inside the main body pin 113 via the insulating member 115. The body pin 113 is disposed inside the cylindrical portion 112 via the insulating member 116. The main body pin 113, the projecting pin 114, and the cylindrical portion 112 are not illustrated, but are fixed to the exterior member 111 so as not to be displaced.

  As shown in FIG. 2, the cable 2 includes a first signal line 21 for a luminance signal Y, a second signal line 22 for a color signal C, and a ground line 23. These electric wires may have an outer peripheral portion covered with an insulating covering member, and three electric wires may be arranged side by side, and the three electric wires may be combined into one covering member. It may be covered.

  As shown in FIG. 2, the ground wire 23 is electrically connected to the cylindrical portion 112. The first signal line 21 is electrically connected to the body pin 113 and the second signal line 22 is electrically connected to the protruding pin 114. These connections are made by soldering here, but are not limited thereto. In addition to soldering, it is possible to widely employ ones that can reliably fix and carry electric signals.

  Next, the receptacle of the video signal terminal according to the present invention will be described. FIG. 3 is a cross-sectional view of a receptacle when a composite signal plug having a single pin is inserted, and FIG. 4 is a cross-sectional view when a plug for transmitting a luminance signal and a color signal is inserted. The receptacle 12 shown in FIGS. 3 and 4 includes a hollow rectangular parallelepiped case 121, a cylindrical grounding portion 122, a first connection portion 123 disposed inside the case 121, and a second connection portion 124. is doing. The case 121 is fixed to the DVD recorder 3. The grounding part 122 is a cylindrical member exposed to the outside of the DVD recorder 3, and the hollow part is connected to an opening connected to the inside of the case 121. In addition, the inner wall portion of the grounding portion 122 is formed of an insulating material.

  The first connection portion 123 is formed integrally with the contact portion 1231 that contacts the pin of the plug inserted into the receptacle 12, the contact portion 1231, and an elastic arm portion 1232, and the tip of the arm portion 1232. And a pressing member 1234 that is attached to the arm portion 1232 and has insulating properties. In addition, a first switching connection portion 1235 and a second switching connection portion 1236 are provided in the vicinity of the contact portion 1233 of the first connection portion 123.

  The first switching connection unit 1235 is a connection unit to which a composite signal CY signal is input, and the second switching connection unit 1236 is a connection unit to which a luminance signal Y is input. The second connection unit 124 is a connection unit to which the color signal C is connected.

  The connection of the video signal terminals according to the present invention will be described below. As shown in FIG. 3, the conventionally used pin plug 9 transmits a composite signal CY as a video signal. A pin 91 to which a signal line through which the composite signal CY flows is connected to a ground line. And a cylindrical portion 92. The pin 91 and the cylindrical portion 92 are arranged in a non-contact and insulated state.

  As shown in FIG. 3, the arm portion 1232 of the first connection portion 123 is tilted inward, and the contact portion 1233 at the tip is in contact with the first switching connection portion 1235. When the pin plug 9 is inserted in this state, the pin 91 comes into contact with the contact portion 1231 of the first connection portion 123 and the cylindrical portion 92 comes into contact with the grounding portion 122 so that the plug 9 and the receptacle 12 are connected. In this way, the composite signal CY is sent from the pin 91 to the first switching connection unit 1235.

  As shown in FIG. 4, when the plug 11 capable of independently transmitting the luminance signal Y and the color signal C is inserted into the receptacle 12, the projecting pin 114 of the plug 11 contacts the second connecting portion 124 and the first The pressing member 1234 of the connecting portion 123 is pressed, the arm portion 1232 is elastically deformed, and the contact portion 1233 is brought into contact with the second switching connecting portion 1236. At the same time, the body pin 113 comes into contact with the contact portion 1231 of the first connection portion. In this way, when the contact portion 1233 comes into contact with the second switching connection portion 1236, the luminance signal Y sent from the body pin 113 is sent to the second switching connection portion 1236, and the color signal C sent from the protruding pin 114 is sent to the second. Each can be transmitted to the connection unit 124.

  As described above, the pin plug 9 for transmitting the composite signal CY and the plug 11 for separately transmitting the luminance signal Y and the color signal C can be automatically selected and connected.

  Another example of the video signal terminal according to the present invention will be described with reference to the drawings. FIG. 5 is a side view of another example of the video signal terminal according to the present invention, and FIG. 6 is a cross-sectional view of the plug of the video signal terminal shown in FIG.

  The video signal terminal 4 can be connected to a plug 41 attached to the cable 5, and has a receptacle 42 attached to the DVD recorder 3. The video signal terminal 4 is used when the cable 5 for transmitting the color difference signals Cb and Cr and the luminance signal Y using individual signal lines is connected to the DVD recorder 3.

  As shown in FIGS. 5 and 6, the plug 41 includes a hollow exterior member 411 formed of a resin, a conductive cylindrical portion 412 that is inserted into the exterior member 411 and partially protrudes from the exterior member 411, and the exterior member. A main body pin 413 having the same central axis as the cylindrical portion 412 inserted into the outer member 411 and a part of the cylindrical portion 412 is inserted into the outer peripheral member 411. The main body pin 413 has a smaller diameter than the main body pin 413. It has a middle pin 414 and a tip pin 415 that has a smaller diameter than the middle pin 414 and protrudes from the tip of the middle pin 414.

  The main body pin 413 has the same diameter as the main body pin 113 of the plug 11 shown in FIG. The middle stage pin 414 has the same diameter as the protruding pin 114 of the plug 11 shown in FIG. 2, and the middle stage pin 414 is disposed inside the main body pin 413 via an insulating member 416. The middle pin 414 is formed to have a cylindrical shape having a diameter larger than that of the tip pin 415, and the tip pin 415 is disposed inside the second pin 415 via an insulating member 417. The main body pin 413 is disposed inside the cylindrical portion 412 via the insulating member 418. The main body pin 413, the middle stage pin 414, the tip pin 415, and the cylindrical portion 412 are not illustrated, but are fixed to the exterior member 411 so as not to be displaced.

  As shown in FIG. 6, the cable 5 includes a first signal line 51 for the luminance signal Y, a second signal line 52 for the color difference signal Cb, a third signal line 53 for the color difference signal Cr, and a ground line 54. Have. These electric wires may have an outer periphery covered with an insulating covering member, and four electric wires may be arranged side by side, and the four electric wires may be combined into one covering member. It may be covered.

  As shown in FIG. 6, the ground wire 54 is electrically connected to the cylindrical portion 412. The first signal line 51 is electrically connected to the body pin 413, the second signal line 52 is electrically connected to the middle stage pin 414, and the third signal line 53 is electrically connected to the tip pin 415. These connections are made by soldering here, but are not limited thereto. In addition to soldering, it is possible to widely employ ones that can reliably fix and carry electric signals.

  Next, the receptacle of the video signal terminal according to the present invention will be described. FIG. 7 is a cross-sectional view of a receptacle when a plug for a composite signal having a single pin is inserted, and FIG. 8 is a cross-sectional view of the receptacle when a plug for separately transmitting a luminance signal and a color signal is inserted. FIG. 9 is a cross-sectional view of the receptacle when a plug for separately transmitting a luminance signal and two color difference signals is inserted.

  7, 8, and 9, the receptacle 42 includes a hollow rectangular parallelepiped case 421, a cylindrical grounding portion 422, a first connection portion 423 disposed inside the case 421, and a second connection portion 424. And a third connection portion 425. The case 421 is fixed to the DVD recorder 3. The grounding part 422 is a cylindrical member exposed to the outside of the DVD recorder 3, and the hollow part is connected to an opening connected to the inside of the case 621. Further, the inner wall portion of the grounding portion 422 is formed of an insulating material.

  The first connection portion 423 is formed integrally with the contact portion 4231 that contacts the pin of the plug inserted into the receptacle 42, the contact portion 4231, and an elastic arm portion 4232, and is formed at the tip of the arm portion 4232. And a pressing member 4234 that is attached to the arm portion 4232 and has insulating properties. In addition, a first switching connection portion 4235 and a second switching connection portion 4236 are provided in the vicinity of the contact portion 4233 of the first connection portion 423. The first switching connection unit 4235 is a connection unit to which the composite signal CY is input, and the second switching connection unit 4236 is a connection unit to which the luminance signal Y is input.

  The second connection part 424 is formed integrally with the contact part 4241 that contacts the pin of the plug inserted into the receptacle 42, the contact part 4241, and an elastic arm part 4242, and is formed at the tip of the arm part 4242. And a pressing member 4244 that is attached to the arm portion 4242 and has insulating properties. Further, in the vicinity of the contact part 4243 of the second connection part 424, a third switching connection part 4245 and a fourth switching connection part 4246 are provided. The third switching connection unit 4245 is a connection unit to which the color signal C is input, and the fourth switching connection unit 4246 is a connection unit to which the color difference signal Cb is input. The third connection unit 425 is a connection unit to which the color difference signal Cr is input.

  As shown in FIG. 7, the arm portion 4232 of the first connection portion 423 is tilted inward, and the contact portion 4233 at the tip is in contact with the first switching connection portion 4235. When the pin plug 9 is inserted in this state, the pin 91 comes into contact with the abutting portion 4231 of the first connecting portion 423 and the cylindrical portion 92 comes into contact with the grounding portion 422 so that the plug 9 and the receptacle 42 are connected. In this way, the composite signal CY is sent from the pin 91 to the first switching connection unit 4235.

  As shown in FIG. 8, when the plug 11 capable of independently transmitting the luminance signal Y and the color signal C is inserted into the receptacle 42, the protruding pin 114 of the plug 11 contacts the contact portion 4241 of the second connection portion 424. At this time, the arm portion 4242 of the second connection portion 424 is tilted inward, and the contact portion 4243 at the tip is in contact with the third switching connection portion 4245. Further, the projecting pin 114 pushes the pressing member 4234 of the first connection portion 423, elastically deforms the arm portion 4232, and brings the contact portion 4233 into contact with the second switching connection portion 4236. At the same time, the body pin 113 contacts the contact portion 4231 of the first connection portion.

  Thus, the contact part 4233 of the first connection part 423 is in contact with the second switching connection part 4236, and the contact part 4243 of the second connection part 424 is in contact with the third switching connection part 4245. The luminance signal Y sent from the body pin 113 is sent to the second switching connection portion 4236, and the color signal C sent from the protruding pin 114 is sent to the third switching connection portion 4245.

  As shown in FIG. 9, when the plug 41 capable of independently transmitting the luminance signal Y and the two color difference signals Cb and Cr is inserted into the receptacle 42, the tip pin 415 of the plug 41 comes into contact with the third connection portion 425. Then, the pressing member 4244 of the second connection portion 424 is pressed to elastically deform the arm portion 4242. As a result, the contact portion 4243 comes into contact with the fourth switching connection portion 4246. In this state, the middle pin 414 comes into contact with the contact portion 4241.

  At the same time, the middle pin 414 pushes the pressing member 4234 of the first connection portion 423 to elastically deform the arm portion 4232 and bring the contact portion 4233 into contact with the second switching connection portion 4236. At the same time, the body pin 413 contacts the contact portion 4231 of the first connection portion 423.

  In this way, the luminance signal Y sent from the body pin 413 is sent to the second switching connection portion 4236, and the color difference signal Cb sent from the middle pin 414 is sent to the fourth switching connection portion 4246 from the tip pin 415. Are transmitted to the third connection unit 425, respectively.

  The video signal terminal 4 described above is an input terminal, but the same applies to an output terminal. In this way, the plug 9 for the composite signal, the plug 11 capable of individually transmitting the luminance signal Y and the color signal C, the luminance signal Y, and the two color difference signals Cb and Cr can be individually transmitted. By providing the receptacle 42 into which the plug 41 can be inserted, the video signal terminal 4 is highly versatile because it does not limit the type of cable to be connected.

  As mentioned above, although embodiment of invention was described concretely, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary.

  The present invention can be applied to a connection device for connecting an AV device and a connection cable when the AV devices are connected to each other.

It is a figure which shows an example of the terminal for video signals concerning this invention. It is sectional drawing of the plug of the terminal for video signals shown in FIG. It is sectional drawing of a receptacle when inserting the plug for composite signals provided with one pin. It is sectional drawing when inserting the plug which transmits a luminance signal and a color signal. It is a side view of the other example of the terminal for video signals concerning the present invention. It is sectional drawing of the plug of the terminal for video signals shown in FIG. It is sectional drawing of a receptacle when inserting the plug for composite signals provided with one pin. It is sectional drawing of a receptacle when the plug which transmits a luminance signal and a color signal separately is inserted. It is sectional drawing of a receptacle when the plug which transmits a luminance signal and two color difference signals separately is inserted.

Explanation of symbols

1 Video signal terminal 11 Plug 12 Receptacle 2 Cable 3 DVD recorder 4 Video signal terminal 41 Plug 42 Receptacle 5 Cable

Claims (6)

A video signal terminal having a receptacle into which a plug is inserted,
A first signal transmission unit for transmitting the first signal;
A second signal transmitter for transmitting the second signal;
A third signal transmitter for transmitting the third signal,
The receptacle is electrically connected to the first signal transmission unit when no signal is transmitted to the third signal transmission unit, and the signal is transmitted to the third signal when the signal is transmitted to the third signal transmission unit. A video signal terminal comprising a first switching connection portion electrically connected to the two-signal transmission portion. The receptacle has a first plug having a pin having a main body portion to which the first signal is transmitted, or a main body portion to which the second signal is transmitted and the third signal is transmitted to the center of the tip of the main body portion. Any one of the second plugs having pins with protrusions is inserted,
The third signal transmission unit is in contact with the protrusion,
The first switching connection portion includes a contact portion that contacts the body portion having conductivity;
A lever part formed integrally with the abutting part and elastically deformed;
A contact portion that is formed at a tip of the lever portion and contacts the first signal transmission unit or the second signal transmission unit;
Having a pressing part attached to the lever part with insulation,
When the first plug is inserted, the contact portion of the first switching connection portion is in electrical contact with the first signal transmission unit, and when the second plug is inserted, 2. The video signal use according to claim 1, wherein the pressing portion is pushed by the protruding portion, the lever portion is elastically deformed, and the contact portion is in electrical contact with the second signal transmitting portion. Terminal. The first signal is a composite signal;
The second signal is either a luminance signal or a color signal,
3. The video signal terminal according to claim 1, wherein the third signal is a signal different from the second signal among luminance signals or color signals. A fourth signal transmission unit for transmitting the fourth signal;
A fifth signal transmitter for transmitting the fifth signal,
When the signal is not transmitted to either the first signal transmission unit or the second signal transmission unit, the receptacle is electrically connected to the fourth signal transmission unit, and the first signal transmission unit Or, when a signal is transmitted to any one of the second signal transmission units, a second switching connection unit that is elastically deformed by the plug and electrically connected to the fifth signal transmission unit is provided. The video signal terminal according to claim 2. The receptacle has a first plug having a pin having a main body portion to which the fourth signal is transmitted, or a main body portion to which the fifth signal is transmitted, and the first signal is transmitted to the center of the tip of the main body portion. A second plug having a pin with a protruding portion or a main body portion to which the fifth signal is transmitted, a middle step portion protruding from the tip of the main body portion and the second signal being transmitted, and a tip of the middle step portion Any of the third plugs having a tip portion that protrudes more and transmits the third signal is inserted,
The third signal transmitter is in contact with the tip;
The first switching connection portion includes a first contact portion that contacts the protruding portion or the middle step portion, and
A first lever portion formed integrally with the first contact portion and elastically deformed;
A first contact portion formed at a tip of the first lever portion and in contact with the first signal transmission unit or the second signal transmission unit;
A first pressing portion having insulation and attached to the first lever portion;
The second switching connection portion is a second contact portion that contacts the body portion;
A second lever portion formed integrally with the second contact portion and elastically deformed;
A second contact portion formed at a tip of the second lever portion and in contact with the fourth signal transmission unit or the fifth signal transmission unit;
A second pressing portion having insulation and attached to the second lever portion;
When the first plug is inserted, the first switching connection portion is such that the first contact portion is in electrical contact with the first signal transmission portion,
When the second plug is inserted, the first switching connection portion is configured such that the first pressing portion is pushed by the tip portion, the first lever portion is elastically deformed, and the first contact portion is the second signal. While being in electrical contact with the transmission unit, the second switching connection unit is electrically connected back to the fourth signal transmission unit,
When the third plug is inserted, the first switching connection portion is configured such that the first pressing portion is pressed by the middle step portion, the first lever portion is elastically deformed, and the first contact portion is the second signal. While being in electrical contact with the transmission section, the second switching connection section is configured such that when the second pressing section is pressed against the tip, the second lever section is elastically deformed and the second contact section is The video signal terminal according to claim 4, wherein the video signal terminal is electrically connected to the fifth signal transmission unit. The first signal is a color signal;
The second signal is either a Cb signal or a Cr signal,
The third signal is a signal different from the second signal among the Cb signal and the Cr signal,
The fourth signal is a composite signal;
6. The video signal terminal according to claim 4, wherein the fifth signal is a luminance signal.

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