JP2576066Y2 - Optical-electrical signal conversion unit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical-electrical signal conversion unit for converting an optical signal into an electric signal and outputting the electric signal.

[0002]

2. Description of the Related Art For example, in a distribution line, an optical sensor for detecting a current or a voltage of an electric circuit is attached to an electric wire or an electric device in order to detect a line accident or to isolate an accident point, and the detection signal is transmitted to the line. Are input to the slave station devices installed at each of the above locations by cable.

An optical cable is connected to a slave station device via an optical connector, and an input signal is processed by an electric signal conversion circuit provided in the slave station device, a correction circuit, an amplification circuit, and the like.

[0004]

In the above prior art, the optical connector is generally liable to cause loss of signal light amount due to moisture contamination or poor connection at the connection point, and the slave station device is liable to the characteristic characteristic of the optical sensor. Since it is configured to correct and amplify and process the input signal and housed together with a control and communication circuit, inspection and replacement of parts in the signal detection unit and the signal processing unit are troublesome.

This invention has been made in view of the problems existing in the prior art, and an object thereof is to provide an optical-electrical signal conversion unit which is easy to maintain and has high reliability. .

[0006]

In order to achieve the above object, according to the present invention, a cylindrical holder case is provided.
And a front case that can be connected along the axial direction of the case.
It is divided into a rear case and a front case.
The interior of the electric circuit connected to the processing unit
On the outer side of the closing plate that closes the rear end opening of the case
Is a light emitting module and a light receiving module
The rear case is connected to an external signal detector.
Introduce the optical fiber cable connected to the
On the outer surface of the obstruction plate that closes the front end side opening
Attached to the end of the optical fiber line and connected to the front case
At the time of connection, the connection ferrule that fits with the module
And further tighten one of the closing plates.
From the head of a given screw toward the other obturator
A guide rod is extended and the other closing plate is connected to both cases.
The gist is that a guide hole for fitting the guide bar is provided at times.

[0007]

[0008] In the invented according to claim 2, wherein the billing
In the invention of the item 1, the gist is that an input signal display means of the light receiving module is provided on the side wall of the holder case.

[0009]

According to the first aspect of the present invention, the front case is provided.
When connecting the rear case to the rear case,
When the rod is fitted into the guide hole on the other case,
Is a ferrule for connecting each optical fiber line and each module.
Are positioned and connected in a corresponding relationship to each other. So
When the two cases are connected,
Are protected by the holder case. Also, the state
When the two cases are separated from the state, the signal detection unit and the signal processing unit
And separate maintenance is possible for each part
It is said.

[0010]

Further, in the invention of claim 2, the holder
The input signal display means on the side wall of the duct can quickly detect an abnormality in the signal detection unit.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Hereinafter, a first embodiment of the invention will be described in detail.

The optical-electrical signal conversion unit 1 is, for example,
As shown in FIG. 1, the optical cable 11 is attached to the tip of an optical cable 11 drawn from a detection unit 10 attached to a distribution line 2, and this optical cable 11 is connected to a slave station device 4 as an external device installed on a telephone pole 3 or the like.

The slave station device 4 has a communication line 5 with a master station (not shown), and a signal line 6 for sending a control signal to a line switch (not shown) installed above the telephone pole 3. Provided. Next, an example of a connection between the signal detection unit and the signal processing unit in the detection unit 10 and the optical-electrical signal conversion unit 1 will be described.

As shown in FIG. 2, the detection unit 10 includes a porcelain core 13 disposed around the distribution line 2 and the core 13.
Current detecting means 10A having a porcelain sensor 14 fitted between the cutting interfaces of the two, two detecting electrodes 15 and 16 spaced apart in the vicinity of the distribution line 2, a capacitance correcting capacitor 17 and this capacitor 17 A voltage detecting means 10B having an electric field sensor 18 connected in parallel with the two detecting electrodes 15 and 16 is provided. Each of the sensors 14 and 18 has a forward path which is a transmitting means of signal optical power. light <br/> off § i Bas lines 12a, 12c and return both sensors 14 and 18 is a transmission unit of an optical signal generated by modulating the optical power optical fiber line 12b, and the 12d is connected.

[0016] current in the forward of the optical fiber line 12a of the detecting means 10A, the light emitting module 19 is connected, magnetic sensor 14 by the module 19 is driving the power supply circuit 20
The optical power for signal is output toward.

Further, the return light off § i Bas line 12b, the light receiving module 21 is connected, this module is corrected and amplified by converting the optical signal from the magnetic <br/> sensor 14 into an electric signal It is configured to input to the circuit 22, process the detection signal, and output.

The input terminals 23a,
23b and output terminals 24a and 24b of the correction / amplification circuit 22
Is connected to the slave station device 4 as an external device. The drive power supply circuit 20 has a ground terminal 23G.

The optical fiber lines 12c and 12d of the voltage detecting means 10B are also provided with a predetermined light emitting module 25, a driving power supply circuit 26, a light receiving module 27, and a correction / amplification circuit 2.
8, input terminals 29a and 29b, output terminals 30a and 30b
And a ground terminal 29G.

Further, the two light receiving modules 21 and 27
Are provided on the output side, respectively.
And signal indicators 33, 3 activated by the circuit signals
4 are provided.

Next, the configuration of the optical-electrical signal conversion unit 1 will be described with reference to FIGS. The holder case 40 is formed in a cylindrical shape and, as shown in FIG.

As shown in FIG. 3, the front case 41 made of metal is provided with a flange 42 at one opening, and a mounting hole 42a for connecting the flange 42 to the outer case 4a of the slave station device 4. A screw hole 42b for connecting a rear case 49, which will be described later, and a packing groove 42c for sealing between the outer case 4a are provided. Further, a fitting portion of the rear case 49 is sealed on the inner periphery of the case. Packing groove 4
1a is provided.

A step portion 41b is formed on the inner periphery of the intermediate portion of the front case 41, and an inner end of the step portion 41b has a closing plate.
It is fixed to the first circuit board 43 that acts as a. The first circuit board 43 has a guide rod 63 or 75
A guide hole 43a that fits with the guide hole 43a is formed.

On the first circuit board 43, two sets of second circuit boards 44 and 45 are erected in parallel with the axis of the front case 41 toward the other opening side, and an electric outlet 46 is fitted to the end thereof. The input terminals 23a, 2 for connecting to an external device as shown in FIG.
3b, 29a, 29b, output terminals 24a, 24b, 30
a, 30b and the ground terminals 23G, 29G are connected to the front case 4.
It protrudes from 1.

On the second circuit boards 44 and 45, the drive power supply circuits 20 and 26, the correction / amplification circuits 22 and 28, and the level determination circuits 31 and 32 are provided. On the back surface of the first circuit board 43, a light emitting diode LED
The light-emitting module 19,2 provided with 1, LED2, etc.
5 and light receiving modules 21 and 27 having photodiodes PD1 and PD2 and the like are attached by screws 47 and connected to predetermined circuits on the second circuit boards 44 and 45.

Each of the modules 21 and 27 is provided with an insertion hole 48 on the front surface thereof, and is located at the bottom of the module, as shown in FIG.
The optical power 21 for signal or the optical signal from the detection unit 10 can be transmitted by exposing 21a, 25a, and 27a.

As shown in FIG. 6, the rear case 49 made of metal has one end formed into a bottomed shape and a through hole 50 is provided.
Within the optical fiber lines 12a, 12b, 12c, 12
d and the tension member 51 are drawn out.

In the through hole 50, a packing 52 is interposed by being pressed against the outer periphery of the optical cable 11, and a backup piece 5 is provided.
By compressing the packing 52 with the fastener 54 screwed to the case via 3, it is possible to prevent moisture and dust from entering the case.

Further, an ear plate 55 is protruded from the fastener 54 to provide a screw hole 55a, and the optical cable 11 is fixed by tightening a retainer 56 with a screw 57. On the other opening side of the rear case 49, a flange 58 is provided to provide a mounting hole 58a for coupling to the front case 41. Further, the flange 58 projects forward of the flange 58 so as to be fitted to the front case 41. Is formed.

A step portion 60 is formed on the inner periphery of the fitting portion 59,
An insulating lid 61 functioning as a closing plate is fastened to the step portion 60 with a plurality of screws 62. One of the screws 62 is provided with a guide rod 63, as can fit the guide rod 63 and the guide hole 43a of the first circuit board 43, to regulate the both cases 41 and 49, positioned in a predetermined orientation To connect.

As shown in FIG. 8, the insulating lid 61 has
A pot-shaped bush 64 having a through hole 64a is fitted in conformity with the arrangement of the modules 19, 21, 25, and 27. Kakuhikarifu § i Bas lines 12a, 12b, 12c, 1
2d, a ferrule 65 made of ceramics is covered and fixed at the tip, and the through holes 64 of the bush 64 are fixed.
a, and the ferrule 65 is connected to each module 1
When inserted into the insertion holes 48 of 9, 21, 25, and 27, the end faces of the optical fiber lines 12a, 12b, 12c, and 12d and the bonding surfaces 19a, 21a, and 25a of the modules 19, 21, 25, and 27, respectively. , 27a are joined to transmit a signal optical power or an optical signal.

A flange-shaped stopper 65a is provided at an intermediate portion of the ferrule 65, and this stopper is connected to the bush 64.
It locks to the inner bottom of the door and regulates the method of projecting to the outside. Further, a coil spring 66 for pressing the stopper 65a of the ferrule 65 is inserted into the bush 64, and the spring 66 is compressed into the bush 64 by a pressing plate 67 provided in contact with the back surface of the insulating lid 61. Is held in.

The insulating lid 61 has a small-diameter stepped portion 68a.
Is fixed by screws 69 to fix the pressing plate 67 locked to the stepped portion. The holding plate 67 is provided with a notch 67 a on the outer periphery, and the ferrule 65 of each of the optical fiber lines 12 a, 12 b, 12 c, 12 d is arranged along the inner edge of the holding plate 67.

The tension member 51 of the optical cable 11 is fixed to the fixing rod 68, and the optical fiber line 12a,
12b, 12c and 12d are protected. Front case 4
The first case 49 and the rear case 49 are connected by inserting an O-ring 84 into the guide groove 41a and tightening the flanges 42, 58 with bolts 70.

In the optical-electrical signal conversion unit 1, a gasket 71 is inserted into the packing groove 42 c and is attached with a bolt 72 of an outer box 4 a of the slave station device 4. Next, the operation of the optical-electrical signal conversion unit configured as described above will be described.

Now, the light emitting modules 19 and 25 and the light receiving modules 21 and 27 and the optical fiber lines 12a and 12b,
Since the terminal portions 12c and 12d are detachably sealed in the holder case 40 so that connection with an external device can be performed by the electric outlet 46, the optical power for signal and the optical signal from the detection unit 10 At the junction with the module, the receiving function is not affected by moisture contamination or the like, so that the receiving function is stabilized.

Further, since the signal detection unit and the signal processing unit can be easily divided, inspection can be simplified, and parts can be replaced without modification of an external device. Further, the directions of the front case 41 provided with each module and the rear case 49 holding each optical fiber line are regulated,
Since the optical fiber line and each module are positioned and joined in a predetermined relationship to prevent a connection error between the signal detection unit and the signal processing unit, inspection and reassembly can be performed in a short time.

As described above, the optical-electrical signal conversion unit of the present invention can be used for monitoring and controlling distribution lines. Second Embodiment Next, a second embodiment including input signal display means 35 and 36 for the light receiving modules 21 and 27 will be described with reference to FIG. In the following description, the same components as those of the first embodiment will be denoted by the same reference numerals in the drawings, and description thereof will be omitted.

[0039] on the first circuit board 43, connected to the level determining circuit 31 of the light-receiving module 21, bis disposed the spring contacts 73 of substantially L-shaped in a position close to the guide hole 43a It is fixed by 74.

The guide hole 43 is provided in the rear case 49 side.
a guide rod 75 which can be fitted into the guide rod 75, a spring contact 76 for contacting the spring contact 73 is fixed to a side of the guide rod 75 by a screw 77, and a lead wire 78 is connected to one end thereof. Core wire 78a is fixed by caulking. The side wall of the rear case 49 is provided with a through hole 79 which is opened to the outside, and a light emitting diode lamp 80 as the signal indicator 33 is fitted into the through hole 79 with a sealing material 81 interposed therebetween to input an input signal. The display means 35 is constituted.

The lamp 80 has one terminal 80a
The lead wire 78 drawn into the rear case 49 through the through hole 61 a of the insulating lid 61 is connected to the other terminal 80.
b is connected to the ground wire 82 and the terminal 83 is connected to the rear case 4
9 and fixed.

For the other light receiving module 27, the input signal display means 36 is provided by the same means or line as described above.
Can be provided. Therefore, the light receiving module 2
Circuits 31 and 32 for determining the level of the input signals to input signals 27 and 27 are provided, and light emitting diode lamps 80 are provided as signal indicators 33 and 34 that operate according to the set levels of the circuits. it can.

The present invention is not limited to the configuration of the above embodiment. For example, instead of providing the light emitting diode lamps 80 as the signal indicators 33 and 34, other sound wave transmitters or other inspection instruments may be provided. An outlet for connection can be provided, and the embodiment can be arbitrarily changed and embodied.

[0044]

According to the first aspect of the present invention, the number of parts is increased.
Each optical fiber that serves as a junction for optical signal transmission without
The front cable can be prevented while preventing
Source and rear case can be connected, signal detector and signal processing
Can be quickly connected to the
If the two cases are separated from the connected state, the signal detection unit and
Since it can be separated from the signal processing unit,
There is an effect that the maintenance work can be easily performed. or,
According to the invention of claim 2, the effect of the invention of claim 1 is provided.
In addition, it can detect abnormalities in the signal detector quickly.
Play a fruit.

[Brief description of the drawings]

FIG. 1 is a front view showing an attached state of an optical-electrical signal conversion unit embodying the present invention.

FIG. 2 is a block circuit diagram illustrating an example of a connection between a signal detection unit and a signal processing unit according to the embodiment of the present invention;

FIG. 3 is a partial cross-sectional view showing a first half of the optical-electrical signal conversion unit in the embodiment.

FIG. 4 is a plan view showing the first half of the optical-electrical signal conversion unit of FIG. 3;

FIG. 5 is a bottom view showing the first half of the optical-electrical signal conversion unit of FIG. 3;

FIG. 6 is a partial cross-sectional view showing the latter half of the optical-electrical signal conversion unit in the embodiment.

FIG. 7 is a partial sectional view showing an assembled state of the embodiment.

FIG. 8 is a sectional view of a main part showing an assembly part of the embodiment.

FIG. 9 is a sectional view of a main part showing another embodiment of the optical-electrical signal conversion unit.

[Explanation of symbols]

1 optical-electric signal conversion unit, 2 distribution line, slave station device as external device, 10 detection unit, 12a,
12b, 12c, 12d Optical fiber wires, 19, 25
Light emitting module, 21, 27 light receiving module, 35,
36 input signal display means, 40 holder case, 41
Front case, 43 first circuit board as closing plate , 43
a guide hole, 44, 45 second circuit board, 46 an electrical outlet, 49 a rear case, as 61 closure plate
Insulation cover, 62 bis, 63,75 guide rod.

Claims (2)

(57) [Scope of request for utility model registration] 1. A cylindrical holder case is attached to the axial direction of the case.
Divided into front case and rear case that can be connected along the direction
The front case is connected to the signal processor of the external device
Install the electric circuit and the rear end of the front case
A light-emitting module is provided on the outer surface of the closing plate that closes the side opening.
A light receiving module connected to the electric circuit;
On the other hand, the rear case has an optical fiber connected to an external signal detector.
Fiber line is introduced and the front end of the rear case
The optical fiber line is provided on the outer surface side of the closing plate for closing the side opening.
Attached to the front end of the
Protruding connection ferrule to be fitted with
Predetermined screw head to fasten one of the obstruction plates
A guide rod extending from the part toward the other closing plate is extended
When the two cases are connected, the guide rod is connected to the other closing plate.
An optical-electrical signal conversion unit characterized in that a guide hole is provided for fitting . 2. The optical-electrical signal conversion unit according to claim 1, wherein an input signal display means of the light receiving module is provided on a side wall of the holder case.