JP2001357742A - Electronics - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable a switch to be operated by slightly sliding a lid plate. SOLUTION: A rectangular hole 11 is formed in a cover plate 3 and the cover plate 3 is slidable with respect to a housing 2. When the screw portion 12 is loosened and the cover plate 3 is slid upward, the switch is located in the rectangular hole portion 11. This allows
The switch can be operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device in which a changeover switch is built in a housing, and more particularly to a communication system in which a transmission path between a center and each subscriber's house is bidirectional. It is suitable for application to the used distributor and the like.

[0002]

2. Description of the Related Art In recent CATV systems, a cable modem is connected to a cable television network, and a personal computer is connected to the cable television network via the cable modem to use various network services. ing. In such a CATV system, various program signals and various data are transmitted from a head end provided in a CATV center to trunk lines constituting a plurality of cable television networks. The various program signals and various data transmitted to the main line are propagated along the main line while being amplified by the bidirectional main line amplifiers provided at predetermined distances and equalized in frequency characteristics and transmitted.

[0003] This trunk line is branched in some places by a branch amplifier or a branching device and branched into a branch trunk line, further distributed by a distributor and tapped off, and drawn into each facility or home via a security device. Become like Thereby, each facility and each home can receive various program signals and various data. A home terminal is provided in each facility and each home, and various program signals are decoded or selected at the home terminal. As a result, a desired program can be enjoyed on the television connected to the home terminal.

Further, in order to connect a personal computer installed in each facility or home to the cable television network, the personal computer is connected to the cable television network via a cable modem. In this case, for example, an upstream signal transmitted when connecting to the Internet from a personal computer is transmitted via a cable modem or a cable television network to a CA.
Ascending to the TV center, the data is sent to the Internet provider via the router provided in the CATV center. As a result, the personal computers installed in each facility and each home are connected to the Internet via the Internet provider, and can receive the Internet service. If the CATV center can provide other network services, similarly, personal computers installed in facilities and homes are connected to the network.

[0005]

The home terminal is connected to a cable network via a distributor, and the same is true for a cable modem. However, cable modems are not necessarily provided for all CATV subscribers. If a cable modem is not provided, the terminal of the distributor connecting the cable modem must be terminated so as to prevent the occurrence of ingress noise. The ingress noise referred to here means noise generated from an electric device or the like superimposed on an uplink signal from a device connected to a terminal to a distributor. For example, when external noise is applied to the center contact or the coaxial cable of the terminal which is an unused terminal of the distributor, the noise is accumulated and becomes large noise, that is, ingress noise, and reaches the center. When the ingress noise is generated, there is a possibility that the uplink cannot be used due to the ingress noise.

Therefore, a plug having a built-in terminating resistor is connected to an unused output terminal so that the output terminal is not used. However, in a case where a cable modem is once installed and then the cable modem is removed. In many cases, an unused output terminal is often not terminated because the plug containing the removed terminating resistor is easily lost. In order to solve this, passing of the upstream signal /
2. Description of the Related Art Distributors having a built-in switch capable of switching and controlling the inhibition are known. The switching control of passing / blocking of the up signal is performed as follows. Upstream frequency bands in cable TV networks differ slightly depending on the cable modem, but 5
And the downstream frequency band is 70 to 55 MHz.
770 MHz. The switch is configured to be able to select either a path through which the entire frequency band passes or a path in which a high-pass filter passing through the frequency band of 70 MHz or higher is inserted. When the cable modem is not connected, the path in which the high-pass filter is inserted is selected by the switch, thereby blocking the frequency band of the upstream signal, thereby generating ingress noise that adversely affects the upstream signal. Can be prevented.

FIG. 6 shows a conventional configuration of a distributor incorporating a switch capable of controlling the passage / rejection of such an upstream signal.
And FIG. The distributor 100 shown in these figures is:
The housing 102 includes a housing 102 and a cover plate 103 attached to cover the front surface of the housing 102. An input terminal (IN) 105 formed of a coaxial connector is provided on one side surface of the housing 102.
The first output terminal (OUT1) 104 and the second output terminal (OU
T2) 106 are provided, and a third output terminal (OUT3) 107 and a fourth output terminal (OUT4) 108 are provided on the side surface of the housing 102 facing the T2) 106. In this case, the downstream signal input from the input terminal 105 is divided into four and output from the first output terminal 104 to the fourth output terminal 108. The upstream signals input from the first output terminal 104 to the fourth output terminal 108 are combined and output from the input terminal 105.

The input terminal 105 and the output terminals 104 and 10
A switch 122 is inserted between 6 and 108, respectively. This switch 122 can be switched so that one of the two paths can be selected. One of these two paths is a path through which both the down signal and the up signal can pass, and the other path is a path through which the down signal can pass but the up signal is blocked. The switch 122 is disposed on the open front surface of the housing 102 and is connected to the housing 1.
The switch 122 can be operated by shifting the cover plate 103 covering the front surface of the cover 02 to expose the opening surface. At this time, the lid plate 103 is fixed to the housing 102 by a pair of screw portions 112,
One of the long holes 11 is formed at one end of the lid plate 103.
4 and is screwed to the housing 102,
2 is a notch 113 formed at the other end of the lid plate 103.
And is screwed to the housing 102.

[0009] The cover plate 103 thus configured is attached to the housing 1.
In order to shift with respect to 02, first, the two screw portions 112 are loosened. Next, the other screw portion 112 is pulled out of the notch 113 by moving the cover plate 103 along the long hole 114. Then, as shown in FIG. 7, the cover plate 103 is rotated about 180 degrees around the one screw portion 112 passing through the long hole 114. Thereby, the housing 1
The opening surface of 02 is exposed, and the four built-in switches 122 can be operated. By switching these four switches 122 to the respective output terminals 104 and 106 to 108 according to the use situation, each output terminal 1
04, 106 to 108 can be prevented from generating ingress noise.

Meanwhile, in the conventional distributor 100, it is necessary to rotate the cover plate 103 by about 180 degrees, so that a space for rotating the cover plate 103 is required. For this reason, when the distributor is installed in a narrow space, there is a problem that the cover plate 103 cannot be rotated and the switch 122 cannot be operated. When the distributor 100 is mounted on a vertical surface such as a wall, when the cover plate 103 is rotated about 180 degrees, the cover plate 10
When the user releases his / her hand, the cover plate 103 rotates and covers the opening surface of the housing 102. Therefore, there is a problem that the other screw portion 112 penetrating the long hole 114 must be tightened after rotating the cover plate 103 by about 180 degrees. Note that the opening surface of the housing 102 is
This is because if the front surface of the housing 102 is opened, unnecessary radiation is generated from the opening surface or external noise enters.
The second opening is shielded by covering it with a cover plate 103.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic apparatus in which the switch means can be operated only by sliding the cover plate when operating the switch means.

[0012]

In order to achieve the above object, an electronic apparatus according to the present invention comprises: a housing having an open surface;
Changeover switch means built in the housing and arranged so that the changeover knob faces the opening;
A cover plate that covers an open surface of the housing and that is slidably attached to the housing, and the cover plate is slid from a predetermined position when the cover plate is slid. The switching knob of the switching switch means can be operated through the formed hole.

Further, in the electronic apparatus of the present invention, when the cover plate is slid from a predetermined position, an engaging portion formed on the cover plate is provided with an engaged portion formed on the housing. It may be adapted to be engaged with the joint. Further, in the electronic device of the present invention, the housing has a first terminal to which a down signal is input and an up signal is output, and at least one terminal to which a down signal is output and an up signal is input. Two second terminals are provided, and the changeover switch means is provided between the first terminal and the second terminal and controls switching of passing / blocking of an upstream signal. May be used in a bidirectional communication system.

According to the present invention, when the cover plate is slid from a predetermined position, the switching knob of the switch can be operated through the hole formed in the cover plate. . Accordingly, the distance for sliding the cover plate can be shortened, and it is not necessary to slide the cover plate beyond the length of the housing. For this reason, the changeover switch means can be operated if there is only a space for installing the distributor. In addition, since the engaging means for engaging the housing when the lid plate is slid is provided, the lid plate does not return to the original position even if the hand is released from the lid plate. The step of retightening the existing screw portion can be omitted.

[0015]

FIG. 1 shows the configuration of a distributor according to an embodiment of an electronic apparatus of the present invention. The distributor 1 according to the embodiment of the present invention shown in FIG. 1 is a distributor incorporating a switch capable of controlling switching of passage / rejection of an upstream signal. Therefore, before describing the configuration of the distributor 1, the distributor 1
Will be described with reference to FIG. As shown in FIG. 5, the distributor 1 according to the present invention has an input terminal (IN).
5, a first output terminal (OUT1) 4, a second output terminal (O
UT 2) 6, a third output terminal (OUT 3) 7, and a fourth output terminal (OUT 4) 8. In this case, the downstream signal input from the input terminal 5 is supplied to the distribution circuit 30 which distributes the four signals via the capacitor C1.
The four down-divided signals are output from the first output terminal 4 to the fourth output terminal 8 via the capacitors C2 to C5, respectively.
The upstream signals input from the first output terminal 4 to the fourth output terminal 8 are combined in the distribution circuit 30 via the capacitors C2 to C5, respectively, and output from the input terminal 5 via the capacitor C1.

A switch 22 having two circuits and two contacts is inserted between the distribution circuit 30 and the four first output terminals 4 to 4. The switch 22 can be switched to select one of the two paths. One path is a first path for blocking an upstream signal in which a high-pass filter (HPF) 31 that passes a frequency band of 70 to 770 MHz that is a downstream frequency band is inserted, and the other path is This is a second path in which an all-pass (PASS) circuit 32 for passing a frequency band of 5 to 770 MHz, which is an up and down frequency band, is inserted. In this case, the switching knob 20 is operated as shown in FIG.
When 2 is switched, the high-pass filter 31 is inserted between the distribution circuit 30 and the first output terminal 4 to the fourth output terminal 8, and the high-pass filter 31 is input from the first output terminal 4 to the fourth output terminal 8. The upstream signal is blocked by the high-pass filter 31 and is not output from the input terminal 5.

However, when the switch 22 is switched in this manner, the cable modem is not connected to the first output terminal 4 to the fourth output terminal 8, and the upstream signal is output from the first output terminal 4 to the fourth output terminal 8. It is not entered. When the switch 22 is switched in this manner, the first output terminals 4 to 4
Even if the output terminal 8 is a vacant terminal, it is possible to prevent the occurrence of ingress noise. When a cable modem is connected to any of the first to fourth output terminals 4 to 8, the switch 22 for the output terminal to which the cable modem is connected is switched to the second path side to go up. And a frequency band of 5 to 770 MHz which is a downstream frequency band. Since the output terminal in which the switch 22 switched to the second path is inserted is not connected to the cable modem and becomes an empty terminal, it is possible to prevent the occurrence of signal noise in this case as well. it can.

A distributor 1 according to the present invention shown in FIG. 1 has a circuit configuration shown in FIG. 5, and the above-described circuit is incorporated in a metal box-shaped housing 2. Further, the front surface of the housing 2 is opened, and a metal cover plate 3 attached to cover the opening surface is provided. The cover plate 3 is formed with, for example, four rectangular holes 11 having a rectangular shape.
Are formed. A screw portion 12 that penetrates each of the sliding grooves 13 is provided, and each of the screw portions 12 is screwed to the housing 2, and the cover plate 3 is fixed to the housing 2. An input terminal (IN) 5, a first output terminal (OUT 1) 4, and a second output terminal (OUT 2) 6 formed of a coaxial connector are provided on one side surface of the housing 2. Is provided with a third output terminal (OUT3) 7 and a fourth output terminal (OUT4) 8. In this case, as described with reference to FIG. 5, the down signal input from the input terminal 5 is divided into four by the distribution circuit 30 and output from the first output terminal 4 to the fourth output terminal 8. Also, the first output terminals 4 to
The upstream signal input from the fourth output terminal 8 is supplied to the distribution circuit 30
And output from the input terminal 5.

Further, switches 22 are inserted between the input terminal 5 and the first to fourth output terminals 4 to 8, respectively. The switch 22 is disposed so as to face the open front surface of the housing 2. In the state shown in FIG. 1, the switches 22 inserted in the first output terminal 4 to the fourth output terminal 8 are covered by the cover plate 3, respectively.
Cannot be switched. When switching, first, the two screw portions 12 are loosened. Then, the cover plate 3 is
Slide in the direction of the arrow shown in. Thus, the cover plate 3
, The sliding groove 13 becomes two screw parts 12
To be slid. Then, the four rectangular holes 11 formed in the cover plate 3 coincide with the portion where the switch 22 is provided. Thus, the switching knobs 20 provided on the four switches 22 can be operated via the rectangular holes 11.
Thus, the number of the rectangular holes 11 is made equal to the number of the switches 22 provided in the distributor 1.

FIG. 2 shows a switch 2 by sliding the cover plate 3.
2 is in a state where the switching knob 20 can be operated. In this case, the engaging projection 10 formed on the upper portion of the cover plate 3 is engaged with the engaging concave portion 9 formed on the upper portion of the housing 2. become. Thereby, even if the distributor 1 is attached to a wall or the like and is inclined, it is possible to prevent the lid plate 3 from returning to the original position when the hand is released from the lid plate 3. Thereby, the work of retightening the slid cover plate 3 with the screw portion 12 can be omitted. Further, since the cover plate 3 may be slid only a short distance until the rectangular hole 11 coincides with the switch 22, the sliding range does not exceed the length of the housing 2 as illustrated. As a result, the switch 22 can be operated by sliding the cover plate 3 as long as there is only a space in which the distributor 1 is mounted. That is, the distributor 1 mounted in a narrow space
In this case, the cover plate 3 can be slid, and the switching knob 20 of the switch 22 can be operated to select one of the two paths. These two paths are paths in which the first path is provided with the high-pass filter 31 for blocking the upstream signal as described above, and the other path is a path through which both the upstream signal and the downstream signal can pass. is there. Switching of the switch 22 is performed in the first
What is necessary is just to determine according to the use condition of the output terminal 4-the 4th output terminal 8. When the operation of the switch 22 is completed, the cover plate 3 is slid to the original position and the screw portion 12 is fastened. This allows the cover plate 3 to cover the opening surface of the distributor 1 and maintain the shielding property.

Next, the structure of the housing 2 of the distributor 1 according to the present invention is shown in FIG. As shown in FIG. 3, the housing 2 is formed in a metal box shape, and the circuit shown in FIG. The front surface of the housing 2 is open, and, for example, four switches 22 are arranged so as to face this open surface. Further, a shield plate is attached so as to cover the front surface of the circuit housing portion 2a, and is shielded by the shield plate except for the switch 22. Furthermore, in the vicinity of the circuit housing portion 2a, 2
Two screw holes 21 are formed, and the screw portions 12 are screwed into the screw holes 21 respectively. Furthermore, an engagement recess 9 is formed in the upper part of the circuit housing 2a. Furthermore, on one side surface of the housing 2, an input terminal (IN) 5 composed of a coaxial connector and a first output terminal (O
UT1) 4 and a second output terminal (OUT2) 6 are provided, and a third output terminal (OUT
3) 7 and a fourth output terminal (OUT4) 8 are provided.

Next, the structure of the cover plate 3 of the distributor 1 according to the present invention is shown in FIG. The cover plate 3 shown in FIG. 4 is attached so as to cover the open front surface of the housing 2 shown in FIG. 3, and is formed by processing a metal plate. The reason why the cover plate 3 is made of metal is to shield the opening surface of the distributor 1, and the shielding property can be maintained when the cover plate 3 is not slid. The cover plate 3 having a rectangular shape in which the circuit accommodating portion 2a of the housing 2 is slightly larger is provided with the same number of rectangular holes 11 as the number of the switches 22, and on both sides thereof, approximately the side edges are formed. A pair of elongated sliding grooves 13 are formed in parallel. The rectangular hole 11 is
When the cover plate 3 is slid as described above, the switch 22 is turned off.
Hole for operating the switching knob 20 of the sliding groove 1
Reference numeral 3 denotes a groove for sliding the cover plate 3 while engaging with the screw portion 12. An engaging projection 10 projecting from the upper portion of the cover plate 3 is formed on the engaging recess 9 formed in the housing 2 when the cover plate 3 is slid. Have been adapted.

The name of a product, the name of a terminal to be switched by a switch, the name of a manufacturer, and the like can be described on the cover plate 3, and the cover plate 3 can be used as a name plate. The electronic device of the present invention described above is not limited to a distributor, but can be applied to an electronic device having a switch that can be switched as needed.

[0024]

As described above, according to the present invention, when the cover plate is slid from a predetermined position, the switching knob of the changeover switch means can be operated through the hole formed in the cover plate. Becomes Accordingly, the distance for sliding the cover plate can be shortened, and it is not necessary to slide the cover plate beyond the length of the housing. For this reason, the changeover switch means can be operated if there is only a space for installing the distributor. In addition, since the engaging means for engaging the housing when the lid plate is slid is provided, the lid plate does not return to the original position even if the hand is released from the lid plate. The step of retightening the existing screw portion can be omitted.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a distributor according to an embodiment of an electronic apparatus of the present invention.

FIG. 2 is a diagram illustrating a configuration in which a cover plate is slid in a distributor according to an embodiment of the electronic apparatus of the present invention.

FIG. 3 is a diagram illustrating a configuration of a casing of the distributor according to the embodiment of the electronic apparatus of the present invention.

FIG. 4 is a diagram showing a configuration of a cover plate of the distributor according to the embodiment of the electronic apparatus of the present invention.

FIG. 5 is a diagram illustrating a circuit configuration of a distributor according to the embodiment of the electronic apparatus of the present invention.

FIG. 6 is a diagram showing a configuration of a conventional distributor.

FIG. 7 is a view showing a configuration in which a cover plate is shifted in a conventional distributor.

[Explanation of symbols]

1 distributor, 2 housing, 2a circuit storage section, 3 lid plate,
4 1st output terminal, 5 input terminals, 6 2nd output terminal, 7
3rd output terminal, 8 4th output terminal, 9 engaging recess, 1
0 engagement projection, 11 rectangular hole, 12 screw, 13
Sliding groove, 21 screw hole, 22 switch, 30 distribution circuit, 31 high-pass filter, 32 all-pass circuit, 1
00 distributor, 102 housing, 103 lid plate, 104
1st output terminal, 105 input terminal, 106 2nd output terminal, 107 3rd output terminal, 108 4th output terminal, 1
12 thread, 113 notch, 114 long hole, 122 switch

 ──────────────────────────────────────────────────続 き Continued on front page F-term (reference) 4E360 AB04 AB12 AB21 BA08 BA15 BB04 BB20 BC03 BC05 EA18 EC11 EC13 EC16 ED02 ED27 FA08 GA06 GA46 GB99 5C064 BA01 BB05 BC14 BC20 BC21 BC27 BD01 5G052 AA28 AA35 BB04 HA14 LA02 LB05

Claims (3)

[Claims] 1. A housing having an opening on one side, a changeover switch built in the housing and having a changeover knob facing the opening, and an opening in the housing. A cover plate slidably attached to the housing, and a hole formed in the cover plate when the cover plate is slid from a predetermined position. An electronic apparatus characterized in that it is configured to be able to operate a switching knob of the switching switch means via the switch. 2. An engaging portion formed on the cover plate is engaged with an engaged portion formed on the housing when the cover plate is slid from a predetermined position. The electronic device according to claim 1, wherein 3. A first terminal to which a down signal is input and an up signal is output, and at least one second terminal to which a down signal is output and an up signal is input. The change-over switch means is provided between the first terminal and the second terminal, and has a function of passing / uplink signal.
2. The electronic apparatus according to claim 1, wherein the transmission path is switched and controlled, and the transmission path is used in a bidirectional communication system.