JP2009077191A - Optical receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to check easily, even if faults arise in an optical receiver, and to prevent general users from directly looking at an optical signal. <P>SOLUTION: A body case 2 is held in an aperture 64 formed in a wall surface 62 of a house. An optical signal input terminal 4 is provided in the back side of the body case 2. A photo diode provided in the body case 2 converts the optical signal input from the optical signal input terminal 4 into a high frequency signal, and supplies it to an output terminal 46. In the front side of the case body 2, a panel 66 which is made to be larger than this is attached in the wall surface 62. The output terminal 46 is provided in the front side of the case body 2 so as to be exposed from the panel 66. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical receiver, and more particularly to an optical receiver incorporated in a wall surface terminal.

  Conventionally, as an optical receiver, there is one disclosed in Patent Document 1, for example. In the technique disclosed in Patent Document 1, an optical modulation signal modulated by a television broadcast signal is transmitted to an optical receiver installed outside a house by an optical fiber, and is demodulated into a television broadcast signal here. It is transmitted indoors via a transmission line such as a coaxial cable.

JP 2007-158669 A

  In the above technique, the optical receiver is disposed outside the house. Moreover, it is often installed in a place where general users cannot easily touch it even outdoors. For this reason, even if an abnormality occurs, it is necessary to call the installer for confirmation. In recent years, it has also been proposed to draw an optical fiber into a house and connect it to an optical outlet provided on the indoor wall. In this case, a shutter is attached to the optical outlet in order to prevent a general user from directly viewing the light modulation signal, but even in this case, the general user may mistakenly view the light modulation signal. is there.

  An object of the present invention is to provide an optical receiver for a wall surface terminal that can be easily checked by a general user and that prevents a general user from directly viewing an optical signal.

  The optical receiver of one embodiment of the present invention has a main body case that can be accommodated in an opening formed in a wall surface of a house. An optical signal input terminal is provided on a surface other than the front surface of the main body case. For example, an optical signal input terminal is provided on the back surface of the main body case. Processing means including photoelectric conversion means for converting the optical signal input from the optical signal input terminal into an electrical signal is provided in the main body case. The processing means may be only the photoelectric conversion means, or may be provided with a level adjustment means for adjusting the level of the electric signal from the photoelectric conversion means. A panel is provided in front of the main body case. The panel is formed larger than the front surface of the main body case and is attached to the wall surface. An electric signal terminal is provided on the front surface of the main body case in a state exposed from the panel, and an output signal of the processing means is supplied.

  In the optical receiver configured as described above, an optical signal is supplied to an optical signal input terminal provided in a main body case installed in a wall surface in the house. Therefore, even if an abnormality occurs, a general user can easily confirm it. In addition, since the electrical signal obtained by converting the optical signal is supplied to the electrical signal terminal provided on the front surface, a general user does not see the optical signal directly, and the safety for eyes is high.

  The optical signal may be obtained by modulating light with a high-frequency signal including a television broadcast signal. In this case, the photoelectric conversion means demodulates the high frequency signal, and the television broadcast signal in the high frequency signal is supplied to the electric signal terminal. If comprised in this way, it will become possible to view and listen to the optically transmitted television broadcast by connecting the television receiver to the electric signal terminal.

  Further, the high frequency signal may include an emergency notification signal. In this case, the photoelectric conversion means also demodulates the emergency notification signal, and this emergency notification signal is supplied to another electrical signal terminal provided on the front surface of the main body case so as to be exposed from the panel. If comprised in this way, an emergency notification broadcast can also be received by connecting an emergency notification broadcast receiver to another electric signal terminal.

  The processing means may include a level adjustment means for a television broadcast signal from the photoelectric conversion means. In this case, the manual operation part of the level adjusting means is provided on the front surface of the main body case in a state exposed from the panel. If comprised in this way, the level of an electric signal can be adjusted and a television broadcast can be viewed in an appropriate state.

  As described above, according to the present invention, even if an abnormality occurs, the general user can easily confirm the safety, and the general user does not see the optical signal directly, and the safety to the eyes Is expensive.

  The optical receiver of one embodiment of the present invention has a main body case 2 as shown in FIG. The main body case 2 is formed in a substantially rectangular parallelepiped shape, and has an optical signal input terminal 4 on a surface other than the front surface, for example, the back surface. An optical fiber 6 is connected to the optical signal input terminal 4. The optical fiber 6 transmits an optical signal obtained by modulating light with a high-frequency signal such as a television broadcast signal and an emergency notification broadcast signal to the optical signal input terminal 4, and is installed in a wall of a house, for example. . The television broadcast signal includes a VHF band and a UHF band television broadcast signal and a BS-IF band and a CS-IF band (satellite broadcast intermediate frequency signal). The emergency notification broadcast signal is broadcast only in an emergency, and has a frequency band lower than that of the VHF band television broadcast signal.

  In the main body case 2, processing means as shown in FIG. 2, for example, an optical receiving circuit 7 is provided. The optical receiving circuit 7 has photoelectric conversion means, for example, a light receiving element, specifically, a photodiode 8. The cathode of the photodiode 8 is connected to the power supply terminal 12 through a high frequency blocking coil 10, and the anode is connected to a reference potential, for example, through a series circuit of a resistor 14 and a capacitor 16 and a high frequency blocking coil 18. Connected to ground potential. That is, a reverse bias state in which a DC voltage of + V is supplied to the cathode is set. An optical signal supplied to the optical signal input terminal 4 is supplied to the photodiode 8, and in response to this, a high-frequency current flows through the photodiode 8, and a television broadcast in the form of a voltage is applied to both ends of the high-frequency blocking coil 18. Signals and emergency notification broadcast signals are generated. In addition, as disclosed in Japanese Patent Application Laid-Open No. 2007-158668, a high-frequency current corresponding to an optical signal can flow in an unbiased state.

  The television broadcast signal and the emergency notification broadcast signal are amplified by an amplification stage, for example, an amplifier 20, and then supplied to a one-branch device 22, and are supplied from its output terminal to a level adjusting means, for example, a gain control circuit 24. After the level adjustment is performed, the signal is supplied to the duplexer 26. The demultiplexer 26 demultiplexes the television broadcast signal into a VHF band and UHF band television broadcast signal and a BS-IF band and CS-IF band television broadcast signal. The television broadcast signals in the VHF band and the UHF band are amplified by an amplification stage, for example, an amplifier 28, subjected to level adjustment by a gain control circuit 30, and then amplified again by an amplification stage, for example, an amplifier 32. Similarly, BS-IF band and CS-IF band television broadcast signals are also amplified by the amplifier 34, level-adjusted by the gain control circuit 36, and again amplified by the amplifier 38. The VHF band, UHF band, BS-IF band and CS-IF band television signals amplified by the amplifiers 32 and 38 are combined by the combiner 40.

  The output signal of the synthesizer 40 is subjected to level adjustment by a level adjustment means, for example, a variable attenuator 42, and then supplied to the one branching device 44. The output generated at the output terminal of the one branching device 44 is supplied to an electric signal output terminal, for example, the output terminal 46, and the output generated at the branch terminal is supplied to the monitor terminal 48.

  The output signal of the amplifier 20 branched from the branch terminal of the one branching device 22 is supplied to extraction means, for example, a low-pass filter 50, and the emergency notification broadcast signal is extracted by the low-pass filter 50 and supplied to the control circuit 52. The control circuit 52 processes the signal so as to be received by an emergency broadcast receiver (not shown), and supplies the signal to the emergency notification output terminal 54.

  The television broadcast signal and the emergency notification broadcast signal generated between both ends of the resistor 14 are supplied to the CPU 56, where the light reception level is detected, and the light reception level falls within a predetermined appropriate light reception level range. It is judged whether it is contained. When the light reception level is within the appropriate light reception level range, the CPU 56 lights the LED 58 in green, for example. When the light reception level is outside the proper light reception level range, the CPU 56 lights the LED 58 in red, for example. When the light reception level is within the appropriate light reception level range, the CPU 56 sets the gains in the gain control circuits 24, 30, and 36 to D / so that the output level from the output terminal 46 falls within the appropriate output level range. A control signal is supplied to the D / A converter 60 so that the A converter 58 adjusts.

  The amplifiers 20, 28, 32, 34, and 38 and the gain control circuits 24, 30, and 36 are supplied with a DC operating voltage from the power supply terminal 12. In addition, an LED 59 can be provided at the power supply terminal 12 in order to visually check the supply state of the DC operating voltage. When the LED 59 is lit in green, the DC operating voltage is in a supply state, and when the LED 59 is off, the DC operating voltage is in a non-supply state.

  As shown in FIG. 1A, on the front surface of the main body case 2, the output terminal 46 of the optical receiving circuit 7, the emergency notification output terminal 54, the operation unit 42 a of the variable attenuator 42, the power supply terminal 12, and the LED 58. , 59 are provided in a line in the vertical direction. Although not shown, the monitor terminal 48 is provided on the side surface or the back surface of the main body case 2. The operation unit 42a of the variable attenuator 42 is of a slide type, and is slid to change the attenuation in any of three stages, for example, −10 dB, −15 dB, and 0 dB.

  As shown in FIG.1 (b), the hole 64 is formed so that the main body case 2 can be accommodated in the rectangular hole 64 formed in the wall 62 of a house. A panel 66 for fixing the main body case 2 to the wall 62 in a state where the main body case 2 is accommodated in the hole 64 is provided on the front surface of the main body case 2. The panel 66 is formed in a rectangular shape that is slightly larger than the main body case 2 and the hole 64. When the panel 66 is attached to the front surface of the main body case 2, the output terminal 46, the emergency notification output terminal 54, the operation unit 42 a of the variable attenuator 42, the power supply terminal 12, the LEDs 58 and 59 are covered by the panel 66. In a broken state, the panel 66 is exposed. As a result, predetermined connectors can be connected to the output terminal 46, the emergency notification output terminal 54, and the power supply terminal 12, respectively, and the operation unit 42a of the variable attenuator 42 can be manually operated. Can be turned on / off from the outside. Reference numeral 68 denotes a screw for fixing the panel 66 to the wall 62.

  In the optical receiver configured as described above, the main body case 2 is accommodated in the wall 62, and the optical signal input terminal 4 is provided on the back surface which is one of the surfaces other than the front surface of the main body case 2. Further, the optical signal from the optical signal input terminal 4 is converted into a high-frequency signal such as a television broadcast signal or an emergency notification broadcast signal by an optical receiving circuit in the main body case 2, and an output terminal 46 on the front side of the main body case 2. And output from the emergency notification output terminal 54. Therefore, the general user does not mistakenly see the optical signal directly, and the eyes are not damaged. Moreover, since the optical signal is supplied to the optical signal input terminal 4 on the back side of the main body case 2 by the optical fiber 6, even when an abnormality occurs in the optical receiver, it can be easily inspected in the house. it can.

  In the above embodiment, the optical signal input terminal 4 is provided on the back surface of the main body case 2, but it can also be provided on the side surface, top surface, or bottom surface. In addition, although the operation unit 42a of the variable attenuator 42 is a slide type, a rotary operation unit can be used. Moreover, although the emergency notification output terminal 54 is provided, it is not necessary in some cases. Similarly, the power terminal 12 is provided on the front surface of the main body case 2. However, when wiring for supplying power is laid in the wall 62, the power terminal 12 may be provided on a surface other than the front surface of the main body case 2. it can. In the above embodiment, the optical receiver circuit 7 is provided, but only the portion related to the photodiode 8 is provided, and a television broadcast signal and an emergency notification signal that are not adjusted in level are supplied to the output terminal 46. You can also

It is the front view and side view of the optical receiver of one Embodiment of this invention. It is a block diagram of the optical receiver of FIG.

Explanation of symbols

2 Body case 4 Optical signal input terminal 7 Optical receiver circuit (processing means)
8 Photodiode (photoelectric conversion means)
46 Output terminal (electric signal terminal)
66 panels

Claims (4)

A body case that can be housed in an opening formed on the wall of the house;
An optical signal input terminal provided on a surface other than the front surface of the main body case;
Processing means provided in the main body case and including photoelectric conversion means for converting an optical signal input from the optical signal input terminal into an electrical signal;
A panel provided on the front surface of the main body case larger than the front surface of the main body case, and attached to the wall surface;
An electrical signal terminal provided on the front surface of the main body case in an exposed state from the panel, and supplied with an output signal of the processing means;
Optical receiver provided.   2. The optical receiver according to claim 1, wherein the optical signal is obtained by modulating light with a high-frequency signal including a television broadcast signal, and the photoelectric conversion means demodulates the high-frequency signal, An optical receiver in which the television broadcast signal is supplied to the electrical signal terminal.   3. The optical receiver according to claim 2, wherein the high-frequency signal includes an emergency notification signal, and the photoelectric conversion unit also demodulates the emergency notification signal, and the emergency notification signal is exposed from the panel. An optical receiver supplied to another electrical signal terminal provided on the front of the case. 3. The optical receiver according to claim 2, wherein the processing unit includes a level adjustment unit of a television broadcast signal from the photoelectric conversion unit, and a manual operation unit of the level adjustment unit is provided on a front surface of the main body case. An optical receiver that is exposed from the panel.

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