JPH10213617A - Wiring path probing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring path probing device which is comprised of a transmitter that supplies a current having a predetermined frequency to a wiring path and a receiver for probing a target wiring path by detecting a magnetic flux generated on the wiring path by virtue of the current supplied by the transmitter. SOLUTION: A receiver 1 detects a magnetic flux generated on a wiring path by virtue of current supplied by a transmitter. A probing face 2b to be opposed to the wiring path is provided to one end portion 2a in the longitudinal direction of a body 2. Probing coils L1 , L2 which are inclined at roughly the same angle in the different directions with respect to the probing face 2b are disposed in the vicinity of the probing face 2b in the inner section of the body 2. In response to switching operation of a switch S2 , a vector sum or a vector difference of magnetic flux vectors in the coil axis directions which are detected by the coils L1 , L2 is obtained so that the magnetic flux which is parallel or perpendicular to the probing face 2b is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a current having a frequency different from the frequency of a current normally flowing in a wiring path to a wiring path, and searching for this current on the switch side to determine the current of the wiring path. The present invention relates to a wiring path detecting device for detecting whether or not the wiring path is connected to a switch.

[0002]

2. Description of the Related Art Conventionally, as a wiring path exploration apparatus of this type, a transmitter for applying a current having a predetermined frequency different from the frequency of a current normally flowing in a wiring path, and a current generated by a current applied from the transmitter are used. And a receiver for detecting the magnetic flux that flows.A search surface facing the wiring path is provided at the tip of the receiver, and in the vicinity of the search surface of the receiver body, in a direction parallel to the search surface. One exploration coil was provided.

Here, a magnetic flux can be generated in the vicinity of the wiring path by applying a current from the transmitter to the wiring path, and a voltage corresponding to the magnetic flux can be generated by adjusting the search coil to the direction of the magnetic flux. Since it is induced in the search coil,
The target wiring path can be searched.

[0004]

In the wiring path exploration apparatus having the above structure, when the wiring path is a one-sided conductor and a circumferential magnetic flux centering on the wiring path is formed, the detection surface of the receiver is formed on the detection surface of the receiver. Since a magnetic flux in a substantially parallel direction is generated, the wiring path can be searched, but when the wiring path is a reciprocating conductor, a magnetic flux in a direction substantially orthogonal to the detection surface is generated at a substantially intermediate position of the reciprocating conductor. There is a problem that almost no voltage is induced in the search coil arranged in parallel with the search surface, and it is difficult to search for a wiring path.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a wiring path capable of reliably detecting a wiring path even when the wiring path is a reciprocating conductor. An object of the present invention is to provide an exploration device. A fourth object of the present invention is to provide a wiring path search device in which the operability of a receiver is improved in addition to the objects of the first to third inventions.

An object of the inventions of claims 5 and 6 is that of claim 1
Another object of the present invention is to provide a wiring path exploration apparatus having an improved magnetic flux detection sensitivity.

[0007]

In order to achieve the above object, according to the present invention, a transmitter for applying a current of a predetermined frequency to a wiring path, and a magnetic flux generated in the wiring path by the current of a predetermined frequency. And a receiver for detecting the target wiring path and detecting the wiring path, a search surface facing the wiring path is provided at the tip of the receiver main body, and the vicinity of the search surface inside the receiver main body. In addition, two search coils for detecting magnetic flux are arranged at substantially the same angle with respect to the search surface in different directions, and the vector sum of the magnetic flux vectors in the coil axis direction detected by the search coils respectively. Alternatively, switching means for switching and outputting the vector difference is provided, and the magnetic flux is detected based on the output of the switching means. It is possible to detect both the magnetic flux in a direction parallel to the magnetic flux perpendicular to the direction for. Further, the output of either one of the vector sum and the vector difference can be increased.

According to the invention of claim 2, in the invention of claim 1, two search coils are connected in series, and the switching means switches the connection of the search coils between the same polarity and opposite polarity, so that a simple circuit is provided. The switching means can be configured by the configuration. In the invention of claim 3, in the invention of claim 1, 2
An adder for adding voltages induced in the search coils,
A subtractor for subtracting the voltages induced in the two search coils, and the switching means switches and outputs the output of the adder or the subtractor. Can be reduced by one, and the possibility of occurrence of a defect such as a contact failure can be reduced.

According to a fourth aspect of the present invention, there is provided a transmitter for applying a current of a predetermined frequency to a wiring path, and a receiver for detecting a magnetic flux generated in the wiring path by the current of the predetermined frequency and searching for a target wiring path. In the wiring path exploration apparatus composed of the following, a search surface facing the wiring path is provided at the tip of the receiver body, and two search coils for detecting magnetic flux are provided near the search surface inside the receiver body. A comparison means, which is disposed at substantially the same angle with respect to the search surface and is inclined in different directions, and compares the magnitude of the vector sum and vector difference of the magnetic flux vectors detected by both search coils, and a comparison result of the comparison means. Display means for displaying the strength of the magnetic flux based on the larger value of the vector sum and the vector difference based on the sum of the vector sum and the vector difference. Ri, it is possible to detect both a magnetic flux perpendicular to the direction of magnetic flux in a direction parallel with respect to exploration surface. Further, it is possible to detect the magnetic flux in the direction parallel to the search surface and the magnetic flux in the direction perpendicular to the search surface without performing the switching operation of the switching unit.

According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, the two search coils are arranged at a distance of about 3
Since it is arranged to be inclined in different directions at an inclination angle from 0 ° to about 60 °, in one of the detection directions of the direction parallel to the search surface and the direction perpendicular to the search surface, the search coil is The magnetic flux vector to be detected can be increased, and in the other detection direction, a magnetic flux equivalent to that of one coil disposed in parallel with the magnetic flux can be detected.

According to a sixth aspect of the present invention, in the first to fourth aspects of the present invention, the two search coils are arranged at a distance of about 4
One coil disposed in parallel to the magnetic flux both in a direction parallel to the search surface and in a direction perpendicular to the search plane because the coil is disposed in a different direction at a tilt angle of 5 °.磁 束 2 times the magnetic flux can be detected.

[0012]

Embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) A wiring path exploration apparatus of the present embodiment includes a transmitter for applying a current of a predetermined frequency to a wiring path, and a receiver for detecting a target wiring path by detecting a magnetic flux generated by the current. It is composed of

As shown in FIG. 1, the receiver 1 includes a main body 2 formed in a substantially rectangular parallelepiped shape, and a search surface 2b facing the wiring path is provided at one end 2a in the longitudinal direction of the main body 2. In the vicinity of the search surface 2b in the main body 2, two search coils L ₁ and L ₂ for detecting magnetic flux generated in the wiring path are provided. At this time, the search coils L ₁ and L ₂ are arranged at substantially the same tilt angle and in different directions with respect to the search surface 2b.

[0014] On the front surface of the main body 2, the light emitting diode LD ₁ for checking voltage of the battery, exploration coil L _1, L
Buzzer Bz the volume changes according to the magnitude of the magnetic flux detected by _2, the light emitting diode LD ₂ to Ld ₆ the number lighting changes according to the magnitude of the magnetic flux detected by the search coil L _1, L ₂ A power switch S ₁ is provided on one side of the main body 2, and a switch S ₂ for switching an arithmetic circuit described later is provided on the other side.

As shown in FIG. 4, the transmitter 10 comprises:
A connector 12 projecting from a side surface of the main body 11;
LED ₇ for operation display provided in front of
And Then, the connector 12 and the wiring path are connected by a cable (not shown), a current of a predetermined frequency is applied to the wiring path from the transmitter 10 via the cable, and a magnetic flux due to this current is generated in the wiring path.

The circuit configuration of the receiver 1 will be described with reference to the circuit diagram shown in FIG. A battery (not shown) is connected between the terminals t ₁ and t ₂ , and the power supply circuit 4 uses the battery connected via the power switch S ₁ as a power supply to supply power for operation to each unit. Further, a light emitting diode LD ₁ for voltage check, a resistor R ₁₁ and a Zener diode ZD ₁
Series circuit of the terminal t through the power switch S _1
1, is connected between t _2, when turned on the power switch S _1, is higher than the voltage Zener voltage of the Zener diode ZD ₁ battery, current flows to the light emitting diodes LD _1, the battery voltage is below a predetermined value It also displays that it is large.

The arithmetic circuit 5 obtains a vector sum or a vector difference of the magnetic flux vectors in the coil axis direction detected by the search coils L ₁ and L ₂ , and determines a voltage according to the magnitude of the vector sum or the vector difference. Output to the circuit 6 and the amplifier circuit 7. The level discriminating circuit 6 outputs five light emitting diodes LD _{2 to} LD ₂ based on the output of the arithmetic circuit 5.
₆ is turned on, and the magnitude of the magnetic flux detected by the search coils L ₁ and L ₂ is displayed in, for example, five stages. Further, the amplifier circuit 7 amplifies the output voltage of the arithmetic circuit 5, and makes the buzzer Bz sound at a volume according to the magnitude of the magnetic flux. Therefore, since the number of lighting of the light emitting diodes LD _{2 to} LD ₆ and the volume of the buzzer Bz become maximum at a place where the magnetic flux detected by the search coils L ₁ and L ₂ is largest, it is necessary to detect a target wiring path. Can be. In addition, instead of changing the volume of the buzzer Bz according to the magnitude of the magnetic flux detected by the search coils L ₁ and L ₂ , the level of the sound of the buzzer Bz may be changed.

By the way, as shown in FIG.
In this example, the search coils L ₁ and L ₂ are connected in series between the terminals t ₃ and t ₄ via switches S _2a and S _2b as switching means.
Switch S _2a is connected to the terminal 'c exploration coil L ₂ (winding start exploration coil L _2), the switch S _2b is connected to the terminal d side exploration coil L ₂ (winding end exploration coil L ₂₎ In this case (indicated by a solid line in FIG. 3), the search coils L ₁ and L ₂ are connected in the same winding direction. On the other hand, when the switch S _2a is connected to the terminal d of the search coil L ₂ and the switch S _2b is connected to the terminal c of the search coil L ₂ (shown by a broken line in FIG. 3), the search coils L ₁ , L ₂ is connected to the winding direction of the coil in the opposite direction. The switches S _2a and S _2b are switched in conjunction with each other by operating the switch S ₂ .

Here, as shown in FIG. 5A, the wiring path 20 connected to the switch 21 is a one-sided conductor and the wiring path 20
When current flows from inside to the back of the paper,
Around the wiring path 20, a clockwise circumferential magnetic flux 30 generated around the wiring path 20 is generated. Therefore, in the vicinity of the search surface 2b, a magnetic flux in a direction substantially parallel to the search surface 2b (arrow A). Occurs.

At this time, since the search coils L ₁ and L ₂ are disposed in a plane orthogonal to the search surface 2b at substantially the same tilt angle with respect to the search surface 2b in different directions, the search coils L ₁ and L ₂ are arranged. The coils L ₁ and L ₂ intersect the magnetic flux 30 at a predetermined inclination angle.
Therefore, the magnitude of the magnetic flux detected by each of the search coils L ₁ and L ₂ is smaller than when one search coil is arranged in parallel with the search surface 2b.

The search coil L₁Terminal b (of the coil
Winding end) and search coil L_TwoTerminal c (coil winding
Is located on the side closer to the exploration surface 2b
Then, as shown in FIG. 5B and FIGS. 6A to 6F,
Search coil L₁, L_TwoMagnetic flux vector detected by
v_Two, V_ThreeAre terminals b and d, respectively (the end of coil winding).
) To terminals a and c (start of coil winding)
It becomes a couture. Here, from terminals b and d to terminals a and c,
The magnetic flux vector is assumed to be positive. Magnetic flux vector v_Two, V_Three
Vector component v parallel to the search plane 2b_2h, V_3hIs the phase
And the vector component v perpendicular to the search plane 2b_2v, V
_3vIs inverted in phase, so that the magnetic flux vector v_Two, V_Three
Is obtained by calculating the vector sum of
Vector components sum (v_2v+ V_3v) Becomes zero and the exploration surface
2b (v _2h+ V_3hGet only)
Can be

Therefore, both search coils L₁, L_TwoBy
Magnetic flux vector v detected_Two, V_ThreeVector sum of
₁To increase the output of the arithmetic circuit 5.
Can be That is, in the circuit shown in FIG.
Switch S_2aIs connected to the terminal c and the switch S
_2bIs connected to the terminal d side,
L ₁, L_TwoAre connected to the same polarity, and the search coil L₁, L
_TwoIs added to the voltage.

On the other hand, as shown in FIG.
The two wiring paths 20a and 20b connected to 1 are reciprocating conductors, and a current flows from one side of the paper to the other side of the paper in one wiring path 20a, and flows from the other side of the paper to the other side in the other wiring path 20b. When a current flows, the wiring path 20
a, 20b, the wiring paths 20a, 20b
b, a clockwise circumferential magnetic flux 30a centered on the wiring path 20a and a counterclockwise circumferential magnetic flux 30b centered on the wiring path 20b are generated.
At a position approximately intermediate from 0a and 20b, a magnetic flux (arrow B) in a direction substantially orthogonal to the search surface 2b is generated.

At this time, FIG. 7B and FIG.
As shown in FIG.₁Detected by
Magnetic flux vector v_TwoIs the search coil L₁From terminal b to terminal
a, and the search coil L_TwoInspection by
The output magnetic flux vector (−v_Three) Is the search coil L_TwoEnd of
The vector is directed from the child c to the terminal d. Magnetic flux vector
v _Two, (−v_Three) Vector component v parallel to search plane 2b
_2h, (−v_3h) Indicates that the phase is reversed and the phase is perpendicular to the search surface 2b.
Kutor component v_2v, (−v_3v) Has the same phase,
Magnetic flux vector v_Two, (−v_Three), That is, the magnetic flux vector
Le v_Two, V_ThreeExploration by finding the vector difference of
Sum of vector components parallel to plane 2b ｛v_2h+ (-V_3h)｝
Becomes zero, and the sum ｛v of the vector components perpendicular to the search surface 2b
_2v+ (-V_3v) Only｝ can be obtained.

Therefore, the output of the arithmetic circuit 5 can be increased by determining the vector difference between the magnetic flux vectors v ₂ and v ₃ detected by the two search coils L ₁ and L ₂ . That is, in the circuit shown in FIG. 3, by connecting the switch S _2a to the terminal d and connecting the switch S _2b to the terminal c, the search coils L ₁ , L
The connection of _{No. 2} is reversed, and the voltage induced in the search coils L ₁ and L ₂ is subtracted to increase the output of the arithmetic circuit 5.

As described above, by switching the switches S _2a and S _2b , the vector sum or vector difference of the magnetic flux vectors detected by the two search coils L ₁ and L ₂ is obtained. Thus, the magnetic fluxes in the parallel and orthogonal directions can be detected. Further, since the output of the arithmetic circuit 5 is switched to the vector sum of the magnetic flux vectors or the vector difference, a larger value of the vector sum and the vector difference can be output, and the magnetic flux detection sensitivity can be increased. it can. Further, since the switching means for the vector sum or the vector difference is constituted only by the switches S _2a and S _2b , the switching means can be realized with a simple circuit configuration. (Embodiment 2) FIG. 9 is a circuit diagram of an arithmetic circuit 5 according to this embodiment.
Shown in

In the first embodiment, by switching the polarity of the search coils L ₁ and L ₂ connected in series to the same polarity and opposite polarity, the magnetic flux vectors in the coil axis direction detected by both the search coils L ₁ and L ₂ are detected. Although the vector sum or the vector difference has been obtained, in the present embodiment, the two search coils L ₁ and L _{2 are used.}
Adder 5a that obtains the vector sum of the magnetic flux vectors in the coil axis direction detected by the two search coils L ₁ and L ₂ , that is, the magnetic flux in the direction parallel to the search surface 2b And the voltages induced in the two search coils L ₁ and L ₂ are subtracted to obtain the two search coils L ₁ and L _2.
1, L ₂ is vector difference of the flux vector in the coil axis direction detected, i.e., a subtracter 5b for determining the magnetic flux in the direction perpendicular to the exploration surface 2b, adder 5a outputs of the arithmetic circuit 5
Or an arithmetic circuit 5 from the switching means serving switch S ₂ Metropolitan to switch the output of the subtracter 5b.

[0028] Here, the capacitor C is exploration coil L _1
1 and a resistor R ₁ are connected, and a search circuit L ₁ , a capacitor C ₁ and a resistor R ₁ constitute a resonance circuit.
Since the resonance frequency of this resonance circuit substantially matches the frequency of the current applied by the transmitter 10, other frequency components can be removed. The search coil L
_2, the resonant circuit composed of the resistor R ₂ and capacitor C ₂ is also have the same function.

The adder 5a comprises an operational amplifier OP ₁ and a resistor R
_{3 to} R _{6, and the} search coils L ₁ , R ₂ are connected to the inverting input terminal of the operational amplifier OP ₁ via resistors R ₃ , R ₄ , respectively.
L ₂ is connected. Then, the operational amplifier OP ₁ is a value obtained by multiplying the voltage across V _L1 exploration coil L ₁ gain (-R ₅ / R _3), the voltage across V _L2 exploration coil L ₂ gains (-R ₅ / R ₄ ) Is added and output. Here, equal resistance value of the resistor R ₃ to R ₅ is, the output voltage of the operational amplifier OP ₁ becomes (V _L1 + V _L2).

On the other hand, the subtractor 5b includes an operational amplifier OP_Twoas well as
Resistance R₇~ R_TenComposed of an operational amplifier OP_TwoNon-anti
Resistor R₇Through the search coil L₁Is connected
OP_TwoResistor R to the non-inverting input terminal of₈Through
And search coil L_TwoIs connected. And the operational amplifier
OP_TwoIs the search coil L₁Voltage V_L1And gain [R
_Ten(R₈+ R₉) / ｛R₈(R₇+ R_Ten)｝]
From the values, the search coil L _TwoVoltage V_L2And gain (-R
₉/ R₈) Is subtracted and output. Where
Anti-R₇~ R_TenIf the resistance values are equal, the operational amplifier OP_Two
Output voltage is (V_L1-V_L2).

The output of the adder 5a and the subtracter 5b is connected to an output terminal t ₅ through the switch S _2, by switching the switch S _2, adder 5a or subtractor 5
Select b output can be output from the output terminal t _5. In the arithmetic circuit 5 of the present embodiment, the search coil L
_1, since L ₂ is outputting switch the vector sum or vector difference of the flux vector in the coil axis direction detected only in one of the switch S _2, 2 pieces of switches S _2a as in the embodiment 1, S _2b As compared with the case where the device is provided, the possibility of occurrence of a failure such as a contact failure of the switch is reduced, and the reliability of the device is improved.

The configuration other than the arithmetic circuit 5 is the same as that of the first embodiment.
Since the configuration is the same as that of the wiring path inspection device, the description thereof is omitted. (Embodiment 3) FIG. 10A is a front view of a receiver of the wiring path exploration apparatus of the present embodiment, FIG. 10B is a side view thereof, and FIG. 11 is a circuit diagram of an arithmetic circuit.

The receiver 1 of the present embodiment has the configuration shown in FIG.
(B), since except that the switch S ₂ is not provided is the same as the receiver 1 shown in FIG. 1, the same symbols are assigned to the same components and description thereof will not be repeated .
Further, as shown in FIG. 11, the arithmetic circuit 5, the arithmetic circuit 5 in FIG. 9, in place of the switch S _2, the adder 5
comparing the output value of a and the subtracter 5b, it is provided comparison means serving comparator circuit 5e to be output from the output terminal t ₅ selects the larger value. Since the configuration other than the comparison circuit 5e is the same as that of the arithmetic circuit 5 of FIG. 9, the same components are denoted by the same reference numerals and description thereof will be omitted.

The comparator circuit 5e is composed of a buffer circuit 5c made of an operational amplifier OP ₃ and the diode D _1, a buffer circuit 5d consisting of an operational amplifier OP ₄ and the diode D _2. In the buffer circuit 5c, the operational amplifier O
Output terminal and the inverting input terminal of the P ₃ is connected via a diode D _1, the output of the adder 5a to the non-inverting input terminal of the operational amplifier OP ₃ is input, the output of the adder 5a from the output terminal of the operational amplifier OP ₃ is Output as is. Similarly,
In the buffer circuit 5d, the output terminal and the inverting input terminal of the operational amplifier OP ₄ is connected via a diode D _2, the output of the subtracter 5b to the non-inverting input terminal of the operational amplifier OP ₄ are inputted from the output terminal of the operational amplifier OP ₄ The output of the subtractor 5b is output as it is. And the buffer circuit 5
c, the output of the 5d is connected to the output terminal t ₅ together,
Adder 5a, of the output of the subtracter 5b, the output of the larger is outputted from the output terminal t _5.

[0035] Note that the configuration other than the arithmetic circuit 5 and the switch S ₂ is similar to that of Embodiment 1 or 2, and a description thereof will be omitted. (Embodiment 4) In this embodiment, Embodiment 1, 2 or 3
As shown in FIGS. 12A to 12D, the search coils L ₁ and L ₂ are arranged so as to be inclined in different directions at an inclination angle of about 30 ° with respect to the search surface 2b. doing.

As shown in FIGS. 12A and 12B, the search surface
When magnetic flux is generated in the direction perpendicular to 2b,
Coil L₁, L_TwoMagnetic flux vectors respectively detected by
The magnitude of the vector component in the direction perpendicular to the search plane 2b is
When one coil is arranged perpendicular to the search surface 2b
Is approximately (１ ／) times as large as Therefore, the exploration coil
L ₁, L_TwoTake the vector difference between the detected magnetic flux vectors.
For example, one coil is arranged perpendicular to the search surface 2b.
A magnetic flux having substantially the same magnitude as in the case can be detected.

As shown in FIGS. 12C and 12D, the search surface
When magnetic flux in the direction parallel to 2b is generated,
Il L₁, L_TwoOf the magnetic flux vectors detected by
The magnitude of the vector component parallel to the search plane 2b is
When the file is arranged in parallel to the exploration surface 2b (√
3/2) times. Therefore, the search coil L₁, L _Two
Takes the vector sum of the detected magnetic flux vectors,
Compared to the case where the coil is arranged parallel to the exploration surface 2b
Thus, a magnetic flux approximately three times as large can be detected.

As described above, if the search coils L ₁ and L ₂ are arranged in different directions at an inclination of about 30 ° with respect to the search surface 2b, a magnetic flux in a direction perpendicular to the search surface 2b is generated. In this case, it is possible to detect a magnetic flux having substantially the same magnitude as when one coil is arranged perpendicular to the search surface 2b, and to generate a magnetic flux in a direction parallel to the search surface 2b. It is possible to detect a magnetic flux having a magnitude of about 場合 3 times that in the case where the coils are arranged in parallel to the search surface 2b.

As shown in FIGS. 13A to 13D, the search coils L ₁ and L ₂ are moved about 60
If you arrange them in different directions at an inclination angle of °,
As shown in FIGS. 13A and 13B, when a magnetic flux is generated in a direction orthogonal to the search surface 2b, the search coils L ₁ ,
Exploration surface 2b of magnetic flux vector detected by L _{2 respectively}
The magnitude of the vector component in the direction perpendicular to the direction is approximately (√3 / の) when one coil is arranged perpendicular to the search surface 2b.
2) Double. Therefore, if the vector difference between the magnetic flux vectors detected by the search coils L ₁ and L ₂ is calculated, a magnetic flux having a magnitude of approximately √3 times that when one coil is arranged perpendicular to the search surface 2b is detected. be able to.

As shown in FIGS. 13C and 13D, when a magnetic flux in a direction parallel to the search surface 2b is generated, the search surface 2b of the magnetic flux vector detected by the search coils L ₁ and L _{2 respectively} . The magnitude of the vector component parallel to is approximately 1 / the value obtained when one coil is arranged parallel to the search surface 2b.
Double. Therefore, if the vector sum of the magnetic flux vectors detected by the search coils L ₁ and L ₂ is calculated, it is possible to detect a magnetic flux having substantially the same magnitude as when one coil is arranged in parallel with the search surface 2 b. Can be.

As described above, if the search coils L ₁ and L ₂ are arranged so as to be inclined in different directions at an angle of about 60 ° with respect to the search surface 2b, a magnetic flux in a direction perpendicular to the search surface 2b is generated. In this case, it is possible to detect a magnetic flux having a size about √3 times that of a case where one coil is arranged perpendicularly to the search surface 2b, and to generate a magnetic flux in a direction parallel to the search surface 2b. Can detect a magnetic flux of substantially the same size as when one coil is arranged parallel to the search surface 2b.

As described above, when the search coils L ₁ and L ₂ are arranged in different directions at an inclination of about 30 ° to about 60 ° with respect to the search surface 2b, the direction parallel to the search surface 2b or In one of the vertical directions,
The sensitivity can be almost the same as the magnetic flux detection sensitivity of the coil arranged parallel to the direction of the magnetic flux. In the other detection direction, the sensitivity is higher than the magnetic flux detection sensitivity of the coil arranged parallel to the direction of the magnetic flux. It can be.

Further, as shown in FIGS. 14A to 14D, the search coils L ₁ and L ₂ are moved by about 4
If the magnetic flux is generated in a direction perpendicular to the search surface 2b as shown in FIGS. 14A and 14B, the search coil L
_1, the magnitude of the perpendicular vector components exploration face 2b of the magnetic flux vector are respectively detected by the L ₂ is approximately (1 when arranged perpendicularly to probe surface 2b a single coil
/ √2) times. Therefore, the search coils L ₁ , L ₂
If the vector difference between the detected magnetic flux vectors is calculated, the approximate √ when one coil is arranged perpendicular to the search surface 2b is obtained.
It is possible to detect a magnetic flux twice as large.

As shown in FIGS. 14C and 14D, when a magnetic flux is generated in a direction parallel to the search surface 2b, the search surface 2b of the magnetic flux vector detected by the search coils L ₁ and L _{2 respectively} . The magnitude of the vector component parallel to is approximately 1 / the value obtained when one coil is arranged parallel to the search surface 2b.
√2 times. Therefore, if the vector sum of the magnetic flux vectors detected by the search coils L ₁ and L ₂ is calculated, the magnetic flux having a size approximately √2 times that of a single coil arranged in parallel with the search surface 2b is obtained. Can be detected.

As described above, when the search coils L ₁ and L ₂ are arranged in different directions at an inclination of about 45 ° with respect to the search surface 2b, a magnetic flux in a direction perpendicular to the search surface 2b is generated. In the case where the magnetic flux is generated in the direction parallel to the search surface 2b, the magnetic flux having a size approximately √2 times larger than that of the coil arranged in parallel to the direction of the magnetic flux can be detected. In addition, the magnetic flux detection sensitivity in the direction perpendicular to and parallel to the search surface 2b can be set to be as high as the same.

[0046]

As described above, an object of the present invention is to provide a transmitter for applying a current of a predetermined frequency to a wiring path and a magnetic flux generated in the wiring path by the current of a predetermined frequency. In a wiring path exploration apparatus comprising a receiver for exploring a wiring path, an exploration surface facing the wiring path is provided at a tip end of the receiver main body, and a magnetic flux is detected in the vicinity of the exploration surface inside the receiver main body. The two search coils are arranged at substantially the same angle with respect to the search surface in different directions, and are switched by switching the vector sum or vector difference of the magnetic flux vectors in the coil axis direction detected by the search coils. Switching means for detecting the magnetic flux on the basis of the output of the switching means, the vector sum or vector difference of the magnetic flux vectors in the coil axis direction is obtained, whereby the magnetic flux in the direction parallel to the search plane is obtained. There is an effect that both can detect such direction of the magnetic flux. In addition, since the output of one of the vector sum and the vector difference can be increased, there is an effect that the detection sensitivity of the magnetic flux in the direction parallel or perpendicular to the search surface can be increased.

According to a second aspect of the present invention, in the first aspect of the present invention, two search coils are connected in series, and the switching means switches the connection of the search coils between the same polarity and the opposite polarity. There is an effect that the switching means can be configured with the configuration. The invention according to claim 3 is the invention according to claim 1, further comprising an adder that adds the voltages induced in the two search coils, and a subtractor that subtracts the voltages induced in the two search coils, Since the switching means switches and outputs the output of the adder or the subtractor, the number of switches can be reduced by one in comparison with the case where the polarity of the search coil is switched, and problems such as defective contacts may occur. The effect is that the reliability can be reduced and the reliability can be improved.

According to a fourth aspect of the present invention, there is provided a transmitter for applying a current of a predetermined frequency to a wiring path, and a receiver for detecting a magnetic flux generated in the wiring path by the current of the predetermined frequency and searching for a target wiring path. In the wiring path exploration device composed of
At the end of the receiver body, a search surface facing the wiring path is provided,
Two search coils for detecting magnetic flux are arranged at substantially the same angle with respect to the search surface in different directions near the search surface inside the receiver body, and the magnetic flux detected by both search coils is provided. Comparison means for comparing the magnitude of the vector difference and the vector difference of the vector, and display means for displaying the strength of the magnetic flux based on the larger value of the vector sum and the vector difference based on the comparison result of the comparison means. Since it is provided, by obtaining the vector sum or vector difference of the magnetic flux vectors in the coil axis direction, there is an effect that both the magnetic flux in the direction parallel to the search surface and the magnetic flux in the direction perpendicular to the search surface can be detected. Further, it is possible to detect the magnetic flux in the direction parallel to the search surface and the magnetic flux in the direction perpendicular to the search surface without performing the switching operation of the switching unit, and thus there is an effect that the operability is improved.

According to a fifth aspect of the present invention, the two search coils are:
Since it is arranged in different directions at an inclination angle of about 30 ° to about 60 ° with respect to the search surface, either one of the direction parallel to the search surface and the direction perpendicular to the search surface is detected. In the direction, the magnetic flux vector detected by the search coil can be increased, and in the other detection direction, there is an effect that a magnetic flux equivalent to that of one coil disposed in parallel with the magnetic flux can be detected.

According to a sixth aspect of the present invention, the two search coils include:
It is arranged in a different direction at an inclination angle of about 45 ° with respect to the search surface, so it is parallel to the magnetic flux in both directions parallel to and perpendicular to the search surface. There is an effect that it is possible to detect about √2 times the magnetic flux of a single coil.

[Brief description of the drawings]

FIG. 1 shows a receiver according to a first embodiment, where (a) is a front view,
(B) is a side view.

FIG. 2 is a circuit diagram of the receiver of the above.

FIG. 3 is a circuit diagram showing an arithmetic circuit of the receiver of the above.

FIG. 4 shows the transmitter of the above, (a) is a front view, (b)
Is a side view.

FIGS. 5A and 5B are explanatory diagrams illustrating the operation of the above receiver.

FIGS. 6A to 6F are explanatory diagrams for calculating a vector sum of magnetic flux vectors according to the first embodiment.

FIGS. 7A and 7B are explanatory views illustrating another operation of the above receiver.

FIGS. 8A to 8F are explanatory diagrams for calculating a vector difference between magnetic flux vectors according to the first embodiment.

FIG. 9 is a circuit diagram illustrating an arithmetic circuit of the receiver according to the second embodiment.

10A and 10B show a receiver according to a third embodiment, where FIG. 10A is a front view and FIG. 10B is a side view.

FIG. 11 is a circuit diagram showing an arithmetic circuit of the receiver of the above.

FIGS. 12A to 12D are explanatory diagrams illustrating the operation of the receiver according to the fourth embodiment.

13 (a) to 13 (d) are explanatory diagrams illustrating another operation of the above receiver.

FIGS. 14A to 14D are explanatory diagrams illustrating another operation of the above receiver.

[Explanation of symbols]

1 receiver 2 body 2a end 2b exploration surface S ₂ switch L _1, L ₂ search coils

Claims (6)

[Claims] 1. A transmitter for applying a current of a predetermined frequency to a wiring path, and a receiver for detecting a magnetic flux generated in the wiring path by the current of the predetermined frequency and searching for a target wiring path. A search surface facing the wiring path is provided at the tip of the receiver body, and two search coils for detecting the magnetic flux are provided near the search surface inside the receiver body. And a switching means for switching and outputting a vector sum or a vector difference of the magnetic flux vectors in the coil axis direction detected by the search coil, respectively, at substantially the same angle with respect to the search surface in different directions. A wiring path exploration apparatus, wherein the magnetic flux is detected based on an output of the switching means. 2. The two search coils are connected in series,
2. The apparatus according to claim 1, wherein the switching unit switches the connection of the search coil to the same polarity or the opposite polarity. 3. An adder for adding the voltages induced in the two search coils, and a subtractor for subtracting the voltages induced in the two search coils, wherein the switching means includes the adder. 2. The wiring path search device according to claim 1, wherein the output of the subtractor is switched and output. 4. A transmitter for applying a current of a predetermined frequency to a wiring path, and a receiver for detecting a magnetic flux generated in the wiring path by the current of the predetermined frequency and searching for a target wiring path. A search surface facing the wiring path is provided at the tip of the receiver body, and two search coils for detecting the magnetic flux are provided near the search surface inside the receiver body. Are arranged at substantially the same angle with respect to the search surface in different directions, and comparing means for comparing the vector sum of the magnetic flux vectors detected by the two search coils and the magnitude of the vector difference, and the comparing means A display means for displaying the strength of the magnetic flux based on the larger value of the vector sum and the vector difference based on the comparison result. 5. The apparatus according to claim 1, wherein the two search coils are arranged at different inclination angles from about 30 ° to about 60 ° with respect to the search surface. 5. The wiring path exploration apparatus according to any one of claims 1 to 4. 6. The wiring according to claim 1, wherein the two search coils are arranged in different directions at an inclination angle of about 45 ° with respect to the search surface. Road exploration equipment.