JP2007101451A - Magnet finder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To find a magnet without losing the magnet by changing sensitivity, even when finding the magnet by using a plurality of kinds of sensitivities. <P>SOLUTION: The magnet finder is provided with Hall elements X1-X4 and Y1-Y4 for generating a voltage, based on the intensity of detected magnetic flux rays by detecting the magnetic flux ray of the magnet 17. In addition, in the magnet finder, a microcomputer measures voltage of each sensitivity (low sensitivity, intermediate sensitivity and high sensitivity) of each of Hall elements X1-X4 and Y1-Y4, and calculates the calculation values E2 for each of the Hall elements X1-X4 and Y1-Y4, by using all each of the sensitivities measured with each of the Hall elements X1-X4 and Y1-Y4. Successively, the user recognizes the direction in which the magnet 17 exists, on the basis of the calculation values E2 calculated on each of the Hall elements X1-X4 and Y1-Y4 by an LED lamp L. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention detects a magnet provided on an arrangement body such as a wiring box arranged on the back side of a concealing material such as a wall material of a building from the front side of the concealing material, and determines the position of the arrangement body. The present invention relates to a magnet detector for detection.

  2. Description of the Related Art Conventionally, a wiring device such as a switch attached to a wall of a building is attached to a wiring box having a bottomed square box shape having an opening on the front surface disposed on the back side of the wall material. The wiring box is attached to a structure such as a pillar so that the opening side faces the back surface of the wall material before the wall material is arranged on the opening side. After being attached to the wiring box body, the wall material is installed on the opening side of the wiring box, and the wiring box is concealed on the back side of the wall material. When connecting a wiring device such as a switch to the wiring box, find the position of the wiring box from the front side of the wall material, and make a hole in the wall material at that position to expose the wiring box to the front side of the wall material. And attach the wiring equipment to the wiring box.

In order to easily find the position of the wiring box from the front side of the wall material, a magnet is provided in the wiring box, and the detection device detects the concealment (wiring box) by detecting the magnet. Is used (for example, Patent Document 1). The detection device described in Patent Document 1 includes a magnet sensor that detects a magnetic flux line (magnetic force) generated from a magnet, and a display unit that indicates to a user when it is determined that there is a magnet based on the detection result of the magnet sensor. And is made up of. The magnet sensor uses a Hall element that generates a voltage when a magnetic flux line passes through. And a detection apparatus is moved along a wall material from the front side of a wall material. Since the voltage generated by the magnet sensor due to the passage of the magnetic flux lines is small, the voltage is amplified by the amplifier circuit, and when the voltage becomes higher than the arbitrarily set reference voltage, the display means is displayed. The voltage amplified by the amplifier circuit changes the intensity of magnetic flux lines that can be detected by the amplification factor to be amplified (range in which the magnet is detected), thereby changing the sensitivity. When the magnet is far away (when the intensity of the magnetic flux lines is small), the gain is increased to increase the sensitivity so that the magnet can be detected over a wide range. On the other hand, when the magnet is in the vicinity (when the intensity of the magnetic flux lines is large), the amplification factor is lowered to lower the sensitivity, thereby preventing an over-sensitivity of the detected voltage. In the detection device, the amplification factor of the amplification circuit is automatically changed according to the intensity of the magnetic flux lines to be detected, and the magnet is detected with appropriate sensitivity.
Japanese Patent No. 3644120

  However, in the detection apparatus described in Patent Document 1, for example, when the voltage is detected with high sensitivity (by increasing the amplification factor), the magnetic flux lines are detected over a wide range, and a plurality of lines are detected. There is a possibility that the magnetic flux line from the magnet or the magnetic flux line other than the magnet is affected. For this reason, if the voltage exceeds the sensitivity at the current sensitivity, the voltage is detected by switching the sensitivity to a lower sensitivity (decreasing the amplification factor), so the detected voltage becomes smaller and the sensitivity is lower. Then, there was a possibility that the voltage could not be detected. That is, since the voltage is detected with one sensitivity, it is necessary to switch the sensitivity each time the sensitivity is exceeded, and the target detected at the time of switching has been lost. In addition, at the moment when the sensitivity is switched, the detected voltage drops rapidly (once it becomes almost zero once), and thus the voltage may not be detected. In such a situation (a situation where the voltage cannot be detected), in Patent Document 1, the sensitivity is increased after several seconds and the magnetic flux lines are detected again in a wide range. However, the sensitivity does not switch until a few seconds have passed, or it takes time to set the sensitivity to be set next, and the detection apparatus has a time during which the magnetic flux lines cannot be detected.

  The present invention has been made in view of such circumstances, and its purpose is to detect a magnet without losing sight of the magnet by switching the sensitivity even when the magnet is detected using a plurality of types of sensitivity. It is to provide a magnet detector capable of performing the above.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a magnet provided on an arrangement body such as a wiring box provided on the back side of a concealing material such as a wall material of a building is provided with the concealing material. In the magnet detector for detecting from the front side of the magnet, a magnet detection means for detecting the magnetic force of the magnet with a plurality of types of sensitivity and generating a voltage based on the strength of the magnetic force detected for each sensitivity, and the magnet detection means are generated A detection result deriving unit for deriving a detection result of the magnet using a plurality of voltage values from among the voltage values for each sensitivity, informing the detection result derived by the detection result deriving unit, and The gist of the present invention is to provide a recognition means for allowing the user to recognize whether or not the detection has been made.

  According to a second aspect of the present invention, in the magnet detector according to the first aspect, the detection result deriving unit calculates a sum or difference of the voltage values for each sensitivity generated by the magnet detection unit, and the calculation is performed. The gist is to derive a detection result of the magnet based on the value.

  According to a third aspect of the present invention, in the magnet detector according to the second aspect, the detection result deriving means derives the detection result in consideration of the influence of the detection result for each sensitivity on the detection result. The gist is to do.

  According to a fourth aspect of the present invention, in the magnet detector according to the second or third aspect, the detection result deriving means adds or multiplies a predetermined constant to the voltage value for each sensitivity. , Calculating the sum or difference of the voltage value after adding the constant or the voltage value after multiplying the constant, the constant depending on the influence of the detection result for each sensitivity on the detection result The gist is that it is stipulated.

  According to a fifth aspect of the present invention, in the magnet detector according to any one of the first to fourth aspects, the magnet detection means amplifies one magnet sensor and a voltage generated by the magnet sensor. The gist is that the plurality of types of sensitivity are set by changing the amplification factor of the voltage by the amplification unit to a plurality of types.

  According to a sixth aspect of the present invention, in the magnet detector according to the fifth aspect of the present invention, the magnet detector has at least three sets of the magnet detection means, and the magnet sensors constituting each magnet detection means are located between adjacent magnet sensors. The gist is that the distance is equal.

  According to a seventh aspect of the present invention, in the magnet detector according to the sixth aspect, the detection result deriving means calculates the calculated value for each of the magnet detecting means and compares the calculated values. Based on the result, the position of the magnet with respect to the magnet sensor is specified as the detection result, and the recognition means determines the position of the magnet specified by the detection result derivation means with respect to the position where the user has performed a detection operation. The gist is to notify the position of the magnet.

  According to an eighth aspect of the present invention, in the magnet detector according to the fifth aspect of the present invention, the magnet detector includes at least four sets of magnet detection means, and the number of sets is a vertical direction perpendicular to the magnet sensor. And the number of the magnet sensors arranged in the vertical direction and the number of the magnet sensors arranged in the horizontal direction are as follows: The recognition means is configured by arranging a plurality of light emitters in a matrix, and the number of light emitters in each row and each column is in each of the vertical direction and the horizontal direction. When the number of the magnet sensors arranged is N, it is set to (2N−1), and the detection result deriving means is configured to detect the detection results of the magnet sensors arranged in the vertical direction and the horizontal Detection result of the magnet sensor arranged in the direction Based on the detection result, the position of the magnet with respect to the magnet sensor is specified, and the recognizing means causes the light emitter corresponding to the position of the magnet specified by the detection result deriving means to emit light. The gist is to notify the position of the magnet with respect to the position where the detection operation is performed.

  According to the present invention, even when a magnet is detected using a plurality of types of sensitivity, detection can be performed without losing sight of the magnet by switching the sensitivity.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the following description, “up”, “down”, “left”, “right”, “front (front)”, and “back (rear)” of the wiring box 11 and the magnet detector 23 are indicated by arrows Z1 shown in FIG. The direction is the up / down direction, the direction of the arrow Z2 is the left / right direction, and the direction of the arrow Z3 is the front / back (front / rear) direction.

First, the wiring box 11 as an arrangement body will be described.
As shown in FIG. 1, the wiring box 11 made of synthetic resin includes a bottom wall 13 having a square plate shape and four side walls 12 (12 a to 12 d) standing from the four side peripheral edges of the bottom wall 13. The box body 14 is formed, and is formed into a bottomed square box shape having an opening on one side (front side in FIG. 1). In addition, in a state where the opening is the front surface, a pair of side walls facing up and down are referred to as an upper side wall 12a and a lower side wall 12b, and a pair of side walls facing left and right are a left side wall 12c and a right side wall 12d.

  The upper side wall 12a and the lower side wall 12b are formed with wiring through portions 15 through which a cable (not shown) can be passed. A cylindrical support portion 16 that protrudes toward the opening side of the box body 14 is formed on the bottom wall 13. A permanent magnet (hereinafter simply referred to as a magnet) 17 is attached and fixed to the opening side (front surface) of the box body 14 in the support portion 16, and the magnet 17 is exposed to the opening side of the box body 14. .

  A plurality of mounting holes 19 are formed in the left side wall 12c of the box body 14 so as to penetrate the left side wall 12c. And as shown in FIG. 1, the box 11 for wiring can be attached to the pillar 20 by screwing the screw 21 from the said attachment hole 19 with respect to the pillar 20 as a structure for constructing a building. It is like that. A wall material 22 as a concealing material is disposed on the opening side of the wiring box 11 attached to the column 20, and the wiring box 11 is concealed and disposed on the back side of the wall material 22.

Next, the magnet detector 23 will be described.
The housing case 24 constituting the outer shell of the magnet detector 23 is formed in a square box shape from a synthetic resin material. The housing case 24 includes a case 24a formed in a bottomed square box shape having an opening on one surface (rear surface in FIG. 1), and a case formed in a bottomed square box shape having an opening on one surface (front surface in FIG. 1). 24b. In other words, the storage case 24 is configured by assembling the opening surfaces of the case 24a and the case 24b to face each other.

  Further, as shown in FIG. 2A, a plurality (49 in the present embodiment) of through holes h having the same size are formed on the upper side of the case 24a. In the through hole group T composed of 49 through holes h, the 49 through holes h are arranged in a matrix of 7 rows × 7 columns. Moreover, the space | interval between the through-holes h adjacent to the left-right direction and the space | interval between the through-holes h adjacent to the up-down direction are formed equally. In the case 24a, a power supply through hole 26b is formed below the through hole group T including 49 through holes h. In the case 24a, a through hole 27b is formed below the power supply through hole 26b.

  In the case 24a, an LED substrate 28 on which a plurality (49 in the present embodiment) of LED lamps (light emitters) L and one power supply LED 26a shown in FIG. ing. The LED board 28 is attached to the case 24a with screws (not shown).

  As shown in FIG. 2B, the LED lamp group R composed of 49 LED lamps L is arranged such that the 49 LED lamps L form a matrix of 7 rows × 7 columns. In the following description, the 49 LED lamps L arranged on the LED substrate 28 are shown by adding a two-digit number indicating the number of rows and the number of columns to the symbol “L”. The first digit number attached to the symbol “L” represents the number of rows from the top in the LED lamp group R, and the second digit number represents the number of columns from the left in the LED lamp group R. The arrangement of the LED lamp L is specified by a combination of “L” and a two-digit number. For example, the notation of the LED lamp L21 means that the LED lamp L21 is arranged in the second row from the top and the first column from the left in the LED lamp group R.

  Further, the LED board 28 is provided with a power supply LED 26a below the LED lamp L77. Further, a power switch 27a is disposed on the LED board 28 below the power LED 26a. In addition, a microcomputer (hereinafter referred to as “microcomputer”) 33 is mounted on the LED substrate 28. The microcomputer 33 controls lighting and extinguishing of each LED lamp L and the power supply LED 26a.

  Each LED lamp L is disposed so as to correspond to each of the through holes h formed in the case 24a in a state where the LED substrate 28 is disposed in the case 24a. For this reason, each LED lamp L can be visually recognized through the through-hole h. In the magnet detector 23 of this embodiment, a recognition means is comprised by the LED lamp group R which consists of 49 LED lamps L (L11-L77).

  The power supply LED 26a corresponds to the position of the power supply through hole 26b of the case 24a. For this reason, the power supply LED 26a is visible through the power supply through hole 26b. The power switch 27 a is inserted through the through hole 27 b and protrudes out of the case 24 a, and can be pressed when the magnet detector 23 is used.

  As shown in FIGS. 3 and 4, a sensor substrate 29 is disposed in the case 24 b of the housing case 24. The sensor substrate 29 is attached to the case 24b with screws (not shown). A plurality (eight in this embodiment) of hall elements (magnet sensors) X1 to X4 and Y1 to Y4 are disposed on the sensor substrate 29. Each Hall element X1 to X4, Y1 to Y4 generates a voltage when a magnetic flux line passes through (when a magnetic force is detected). Furthermore, the voltage generated by each of the Hall elements X1 to X4 and Y1 to Y4 increases in proportion to the strength of the magnetic flux lines passing through (the magnitude of the magnetic force). In each Hall element X1 to X4 and Y1 to Y4, the magnitude of the generated voltage varies depending on the temperature difference or the like, but the amount of change in voltage with respect to the intensity of the magnetic flux lines is determined in advance.

  In the present embodiment, the Hall elements X1 to X4 are arranged so as to extend in a straight line in the left-right direction (lateral direction) of the sensor substrate 29, as shown in FIG. Further, as shown in FIG. 4, the Hall elements Y <b> 1 to Y <b> 4 are arranged to extend in a straight line in the vertical direction (vertical direction) of the sensor substrate 29. For this reason, if a straight line passing through the centers of the Hall elements X1 to X4 is defined as the virtual line K1, and a straight line passing through the centers of the Hall elements Y1 to Y4 is defined as the virtual line K2, the Hall elements X1 to X4 and the virtual line K2 on the virtual line K1. The upper Hall elements Y1 to Y4 are arranged on the sensor substrate 29 so as to intersect at right angles. Further, the four Hall elements X1 to X4 on the virtual line K1 are arranged so that the intervals between adjacent Hall elements are equal. Specifically, the distance between the Hall element X1 and the Hall element X2, the distance between the Hall element X2 and the Hall element X3, and the distance between the Hall element X3 and the Hall element X4 are all equal. Further, the four Hall elements Y1 to Y4 on the virtual line K2 are arranged so that the intervals between adjacent Hall elements are equal. Specifically, the distance between the Hall element Y1 and the Hall element Y2, the distance between the Hall element Y2 and the Hall element Y3, and the distance between the Hall element Y3 and the Hall element Y4 are all equal.

  When the intersection of the virtual line K1 and the virtual line K2 is the center point C, the Hall elements X2, X3, Y2, and Y3 are arranged at the same distance r1 from the center point C. For this reason, the Hall elements X2, X3, Y2, and Y3 are arranged on the virtual circle K3 having the center point C as the center and the distance r1 as the radius. The hall elements X1, X4, Y1, and Y4 are arranged at the same distance r2 from the center point C. For this reason, the Hall elements X1, X4, Y1, and Y4 are arranged on a virtual circle K4 with the center point C as the center and the distance r2 as the radius. In the magnet detector 23 of the present embodiment, the Hall elements X1 and X2 and the Hall elements X3 and X4 are arranged symmetrically (line symmetry) about the virtual line K2. In addition, the Hall elements Y1, Y2 and the Hall elements Y3, Y4 are arranged vertically symmetrical (line symmetrical) about the virtual line K1.

  In addition, a plurality of amplifying units 32 a to 32 h are mounted on the sensor substrate 29. In the present embodiment, eight amplifying units 32a to 32h are mounted, and the same number as the Hall elements X1 to X4 and Y1 to Y4 is mounted. Each amplification part 32a-32h amplifies the voltage which each Hall element X1-X4, Y1-Y4 generate | occur | produces. In the present embodiment, the amplifying units 32a to 32h function as an amplifying unit, and a magnet detecting unit is configured by the Hall elements X1 to X4, Y1 to Y4 and the amplifying units 32a to 32h.

  Further, as shown in FIG. 3, a dry battery 30 for operating the magnet detector 23 is housed in the housing case 24 (case 24 b). The dry battery 30 is connected to the LED substrate 28 and the sensor substrate by a connection line 31. 29. The magnet detector 23 is supplied with operating power from the dry battery 30 when the power switch 27a is turned on (pressed). A power source for operating the magnet detector 23 may be a rechargeable battery or a battery instead of the dry battery 30.

  Further, as shown in FIG. 3, a circular stamp S for marking is disposed on the back side of the case 24b. The stamp S is disposed so that the center of the stamp S is positioned at the virtual circle K3 formed by the Hall elements X1 to X4 and Y1 to Y4 and the center point C of the virtual circle K4. Further, the stamp S is provided with a cap (not shown). When the magnet detector 23 is not used, the stamp S is protected (sealed) by the cap.

Hereinafter, the electrical configuration of the magnet detector 23 of the present embodiment will be described in more detail.
The microcomputer 33 mounted on the LED board 28 is provided with a memory M. The memory M stores a control program for detecting the magnet 17 and performs various calculations based on the control program. The microcomputer 33 is connected to a power LED 26a and a power switch 27a.

  In addition, the hall elements X1 to X4 and Y1 to Y4 disposed on the sensor substrate 29 are connected to the microcomputer 33 via the amplifiers 32a to 32h. Each Hall element X1-X4, Y1-Y4 and each amplification part 32a-32h are connected separately. Specifically, each of the amplifying units 32a to 32h is connected to one hall element X1 to X4 and Y1 such that the Hall element X1 and the amplifying unit 32a are connected, and the Hall element X2 and the amplifying unit 32b are connected. To Y4.

  As shown in FIG. 6, each of the amplifying units 32a to 32h includes one amplifier OP and one changeover switch SW. The changeover switch SW is for switching the amplification factor of the amplifier OP, and the amplifier OP amplifies the voltage generated by the Hall elements X1 to X4 and Y1 to Y4 according to the amplification factor set by the changeover switch SW. In the present embodiment, a plurality of types of amplification factors can be set by the changeover switch SW. Specifically, three types of amplification factors of 50 times, 20 times, and 10 times can be set. In the following description, an amplification factor of 50 times may be indicated as high sensitivity, an amplification factor of 20 times as medium sensitivity, and an amplification factor of 10 times as low sensitivity.

  The changeover switch SW sets one of three types of amplification factors according to a changeover signal from the microcomputer 33. In the following description, setting (or switching) the amplification factor may be referred to as setting (or switching) sensitivity. The amplifier OP amplifies the voltage generated by the Hall elements X1 to X4 and Y1 to Y4 according to the amplification factor set by the changeover switch SW, and outputs the amplified voltage to the microcomputer 33. In FIG. 6, only the Hall element X1 and the amplification unit 32a are illustrated. However, in each amplification unit 32b to 32h connected to the Hall elements X2 to X4 and Y1 to Y4, one amplifier OP and one amplification unit are also provided. The switch SW is configured to amplify the voltage generated by each of the Hall elements X2 to X4 and Y1 to Y4.

  In the magnet detector 23 of the present embodiment, each Hall element X1 to X4, Y1 to Y4 generates a voltage proportional to the strength of the magnetic flux line that passes through the magnetic flux line. And the intensity | strength of a magnetic flux line becomes so weak that it leaves | separates from the magnet 17. FIG. That is, the closer the distance between each Hall element X1 to X4, Y1 to Y4 and the magnet 17, the greater the voltage generated by each Hall element X1 to X4 and Y1 to Y4. On the other hand, the farther the distance between each Hall element X1 to X4, Y1 to Y4 and the magnet 17, the smaller the voltage generated by each Hall element X1 to X4 and Y1 to Y4. For this reason, when detecting the magnet 17 by the magnet detector 23, it can be said that the Hall elements X1 to X4 and Y1 to Y4 are closer to the magnet 17 as a larger voltage is generated with reference to the offset voltage. And in the magnet detector 23 of this embodiment, since the voltage which each Hall element X1-X4, Y1-Y4 generate | occur | produces is very small, in order to grasp | ascertain the intensity | strength of a magnetic flux line more correctly, amplification part 32a-32h The voltage is amplified at.

  When performing detection using high sensitivity, medium sensitivity, and low sensitivity as in the magnet detector 23 of the present embodiment, the magnetic flux detection at high sensitivity has a voltage amplification factor of other sensitivity (medium, low sensitivity). Since it is larger than that, it is possible to detect the passage of minute magnetic fluxes of the hall elements X1 to X4 and Y1 to Y4. Further, the magnet detector 23 detects the passage of a large magnetic flux as the sensitivity increases from high to medium to low. For this reason, in magnetic flux detection with high sensitivity, it is possible to detect magnetic flux lines over a wider range than other sensitivities.

Hereinafter, in the magnet detector 23 of this embodiment, the process which the microcomputer 33 performs based on the control program memorize | stored in the memory M is demonstrated.
When the power of the microcomputer 33 of the magnet detector 23 is turned on by depressing the power switch 27a, the microcomputer 33 first executes an initial process according to the control program, and executes the magnet detection process shown in FIG. 8 after the initial process is completed. To do.

First, the initial process will be described.
The initial process is a process performed only when the power is turned on. The Hall elements X1 to X4 and Y1 to Y4 generate a very small voltage (offset voltage) even when no magnetic flux lines are detected. For this reason, in the initial process, before starting detection of the magnet 17, a correction value A for correcting variations in measured values due to the offset voltages of the Hall elements X1 to X4 and Y1 to Y4 is calculated. . The correction value A is calculated for each of the hall elements X1 to X4 and Y1 to Y4.

In the initial process, the microcomputer 33 calculates the calculated value E1 using the formula (1) for each of the hall elements X1 to X4 and Y1 to Y4.
E1 = (S1 / 4) + (S2 / 5) + (S3 / 4) (1)
In Equation (1), “S1” is a measurement value with high sensitivity, “S2” is a measurement value with medium sensitivity, and “S3” is a measurement value with low sensitivity. Therefore, the microcomputer 33 sequentially sets the amplification factor by the switching control of the changeover switch SW of the amplification units 32a to 32h connected to the hall elements X1 to X4 and Y1 to Y4, and outputs the high sensitivity, medium which is the output of the amplifier OP. The measured values S1 to S3 at the sensitivity and the low sensitivity are acquired for each of the hall elements X1 to X4 and Y1 to Y4. Each measured value S1 to S3 is a voltage value amplified by the amplifier OP. The microcomputer 33 multiplies each of the measured values S1 to S3 acquired for each of the hall elements X1 to X4 and Y1 to Y4 by a predetermined constant, adds the multiplied values, and adds the hall elements X1 to X4. A calculated value E1 is calculated for each of Y1 to Y4. In the present embodiment, a calculation value E1 and a calculation value E2 to be described later are calculated based on the expression (1) and the expression (2) to be described later, and the presence / absence of the magnet 17 and the position of the magnet 17 are specified using the results as detection results. I have to.

  In the present embodiment, as shown in Expression (1), a constant that is multiplied by the high-sensitivity measurement value S1 is “1/4”, and a constant that is multiplied by the measurement value S2 of the medium sensitivity is “1/5”. A constant for multiplying the low-sensitivity measurement value S3 is set to “1/4”. Each of these constants is determined in consideration of the influence of the measurement values S1 to S3 measured at each sensitivity (high sensitivity, medium sensitivity, and low sensitivity) on the detection result of the magnet 17. In this embodiment, the constant is determined so that the result of measurement with high sensitivity and low sensitivity is largely reflected in the detection result, and the constant is determined so that the result of measurement with medium sensitivity is not largely reflected.

  In the present embodiment, the measured value S2 at medium sensitivity is multiplied by a smaller value than the measured value S3 at low sensitivity, and the measured value S3 at low sensitivity is taken into consideration in the calculation. . For example, when a Hall element that measures voltage with medium sensitivity and a Hall element that measures Hall element with medium sensitivity and low sensitivity, when the measured value is calculated as it is, the medium sensitivity included in the calculation result The measured value S2 is larger than the low-sensitive measured value S3. For this reason, when the difference in the measured value between the Hall elements is in the measured value S3 with low sensitivity, it is difficult to obtain the difference in the measured value between these Hall elements. Therefore, by multiplying the measurement value at the medium sensitivity by a value smaller than the low sensitivity, the difference in the calculation value due to the measurement value at the low sensitivity becomes remarkable.

  Subsequently, the microcomputer 33 that has calculated the calculated value E1 compares the calculated values E1 of the Hall elements X1 to X4 and identifies the Hall element that has the largest calculated value E1. Then, the microcomputer 33 calculates the relative values of the calculated values E1 of the other Hall elements based on the specified calculated value E1 of the Hall elements, and uses the calculated relative values as the correction values A of the Hall elements X1 to X4. Is stored in a predetermined area of the memory M. Similarly, the microcomputer 33 calculates the correction value A based on the calculated values E1 of the hall elements Y1 to Y4 and stores them in a predetermined area of the memory M. Thereafter, the microcomputer 33 ends the initial process, and thereafter executes the magnet detection process (shown in FIG. 8) until the power is shut off. When the initial processing is completed, the microcomputer 33 turns on the power supply LED 26a so that the user can recognize that the magnet 17 can be detected.

Next, the magnet detection process will be described with reference to FIG.
In the magnet detection process shown in FIG. 8, the microcomputer 33 controls the changeover switch SW of the amplifying units 32a to 32h to measure the voltage generated by the Hall elements X1 to X4 and Y1 to Y4 with low sensitivity. The voltage with sensitivity is measured (step S11). Subsequently, the microcomputer 33 controls the changeover switch SW of the amplifiers 32a to 32h to measure the voltage at the medium sensitivity in order to measure the voltage generated by each of the Hall elements X1 to X4 and Y1 to Y4 with the medium sensitivity. (Step S12). Further, the microcomputer 33 controls the change-over switch SW of the amplifying units 32a to 32h and measures the voltage with high sensitivity in order to measure the voltage generated by each Hall element X1 to X4 and Y1 to Y4 with high sensitivity. (Step S13). In steps S11 to S13, the microcomputer 33 sequentially stores (sets) the measurement values S1 to S3 measured at each sensitivity (low sensitivity, medium sensitivity, and high sensitivity) in the memory M.

  Subsequently, the microcomputer 33 reads the measured values S1 to S3 stored in steps S11 to S13 from the memory M, and calculates the calculated values E2 of the hall elements X1 to X4 and Y1 to Y4 based on the equation (2) (steps). S14).

E2 = (S1 / 4) + (S2 / 5) + (S3 / 4) + A (2)
Expression (2) is an expression for adding the correction value A calculated in the initial process to Expression (1). In Expression (2), the microcomputer 33 calculates the calculated value E2 by the sum of the measured values S1 to S3 at each sensitivity (the sum of the voltage values for each sensitivity generated by the Hall elements X1 to X4 and Y1 to Y4). Yes. The calculated value E2 is calculated for each of the hall elements X1 to X4 and Y1 to Y4, and is handled as a value for the intensity of the magnetic flux lines detected by the hall elements X1 to X4 and Y1 to Y4. In the present embodiment, eight calculated values E2 are calculated for the Hall elements X1 to X4 and Y1 to Y4. Further, the microcomputer 33 stores (sets) the calculated value E2 of each Hall element X1 to X4 and Y1 to Y4 calculated in Step S14 in the memory M.

  The microcomputer 33 according to the present embodiment always detects (measures) the voltage with respect to the magnetic flux lines by switching each sensitivity (high sensitivity, medium sensitivity, low sensitivity) with the changeover switch SW after the detection of the magnet 17 is started. Yes. Since the voltage value is always measured, the calculated value E2 is always calculated as shown in FIG. In FIG. 7, the relationship between the calculated value E2 with respect to the magnetic flux lines is indicated by a straight line H with the calculated value E2 being the vertical axis and the intensity of the magnetic flux lines being the horizontal axis.

  For example, when the measured value S1 at high sensitivity exceeds the sensitivity, the sensitivity is switched to medium sensitivity in the case of a conventional magnet detector. However, in the magnet detector 23 of the present embodiment, even when the measurement value S1 with high sensitivity exceeds the sensitivity, the measurement value S1 with high sensitivity that has exceeded sensitivity, the measurement value S2 with medium sensitivity and low sensitivity, and the measurement. The calculated value E2 is calculated from the value S3. For this reason, as shown in FIG. 7, the calculated value E2 is always calculated with respect to the intensity of the magnetic flux lines. That is, the magnet 17 is not lost even if the measurement value S1 has high sensitivity and the sensitivity exceeds.

  And the microcomputer 33 which calculated the calculated value E2 of each Hall element X1-X4, Y1-Y4 by step S14 specifies the direction where the magnet 17 exists based on each calculated value E2 (step S15). In step S15, the microcomputer 33 reads the calculated values E2 of the hall elements X1 to X4 stored in the memory M in step S14, compares the read calculated values E2, and based on the comparison result, the hall elements X1 to X4. Among these, the Hall element having the maximum calculated value E2 is specified. Then, the microcomputer 33 stores (sets) the value of the calculated value E2 specified as the maximum in the memory M as the maximum value MX. That is, it is determined which of the Hall elements X1 to X4 is close to the magnet 17 by using the calculated value E2 (measurement value of each sensitivity).

  Also, in the Hall elements Y1 to Y4, the Hall element having the maximum value of the calculation value E2 is specified, and the calculation value E2 specified to be the maximum is stored (set) in the memory M as the maximum value MY. Then, the microcomputer 33 determines which of the hall elements Y1 to Y4 is closer to the magnet 17 in the same manner as the hall elements X1 to X4. Based on the determination result, the microcomputer 33 causes the user to recognize the direction in which the magnet 17 is present by turning on the LED lamp L in a process described later. In that case, based on the LED lamp L44, the user is made aware of which direction the magnet 17 is present depending on which direction the LED lamp L is lit. That is, the LED lamp L44 indicates the position of the user, and the lit LED lamp L indicates the direction of the magnet 17.

  Specifically, when the calculated value E2 of the Hall element X1 is the maximum value MX, the Hall element X1 is located closest to the magnet 17. Further, in order to determine whether or not the magnet 17 is on the Hall element X2 side (whether or not it is on the opposite side of the Hall element X2), the difference of the calculated value E2 from the Hall element X2 with respect to the Hall element X1 is determined. calculate. In the present embodiment, the calculated value E2 of the Hall element X1 is the maximum, but if the difference is the same within a predetermined determination value range, the distance between the Hall element X1 and the magnet 17 of the Hall element X2 is the same. And That is, if the difference is within the range of the determination value, the LED lamps L arranged in the second column from the left of the LED lamp group R (the LED lamps with the second digit number “L” being “2”) L) is specified. On the other hand, if the difference is outside the range of the determination value, the LED lamps L arranged in the first column from the left of the LED lamp group R (the LED lamps where the second digit of the code “L” is “1”) L) is specified. Note that the determination value also exhibits the same effect in the difference between the calculated values E2 with respect to the Hall elements X2 to X4.

  When the calculated value E2 of the hall element X4 is the maximum value MX, the hall element X4 is located closest to the magnet 17. Further, in order to determine whether or not the magnet 17 is on the Hall element X3 side (whether or not it is on the opposite side of the Hall element X3), the difference of the calculated value E2 from the Hall element X3 with respect to the Hall element X4 is determined. calculate. If the difference is within the range of the determination value, the LED lamps L arranged in the sixth column from the left of the LED lamp group R (the LED lamp L having the second digit number “L” is “6”). Is identified. On the other hand, if the difference is outside the range of the determination value, the LED lamps L arranged in the seventh column from the left of the LED lamp group R (the LED lamps with the second digit number “L” being “7”) L) is specified.

  When the calculated value E2 of the hall element X2 is the maximum value MX, the hall element X2 is located closest to the magnet 17. Further, in order to determine which side of the hall element X1 or the hall element X3 the magnet 17 is present, the magnitudes of the calculated values E2 of the hall element X1 and the hall element X3 are compared. When the calculated value E2 of the Hall element X1 is larger, the difference between the calculated value E2 and the Hall element X1 with respect to the Hall element X2 is calculated. If the difference is within the range of the determination value, the LED lamps L arranged in the second column from the left of the LED lamp group R (the LED lamp L whose second digit number “L” is “2”) are arranged. ). Further, if the difference is outside the range of the determination value, the LED lamps L arranged in the third column from the left of the LED lamp group R (the LED lamps with the second digit number “L” being “3”) L) is specified.

  On the other hand, when the calculated value E2 of the Hall element X3 is larger than the calculated value E2 of the Hall element X1, the difference between the calculated value E2 and the Hall element X3 with respect to the Hall element X2 is calculated. If the difference is within the range of the determination value, the LED lamps L arranged in the fourth column from the left of the LED lamp group R (the LED lamp L whose second digit number “L” is “4”) are arranged. ). Further, if the difference is outside the range of the determination value, the LED lamps L arranged in the third column from the left of the LED lamp group R (the LED lamps with the second digit number “L” being “3”) L) is specified.

  When the calculated value E2 of the hall element X3 is the maximum value MX, the hall element X3 is located closest to the magnet 17. Further, in order to determine which side of the hall element X2 or the hall element X4 the magnet 17 is present, the magnitude of the calculated value E2 of the hall element X2 and the hall element X4 is compared. When the calculated value E2 of the Hall element X2 is larger, the difference between the calculated value E2 and the Hall element X2 with respect to the Hall element X3 is calculated. If the difference is within the range of the determination value, the LED lamps L arranged in the fourth column from the left of the LED lamp group R (the LED lamp L whose second digit number “L” is “4”) are arranged. ). On the other hand, if the difference is outside the range of the determination value, the LED lamps L arranged in the fifth column from the left of the LED lamp group R (the LED lamps with the second digit number “L” being “5”) L) is specified.

  On the other hand, if the calculated value E2 of the Hall element X4 is larger than the calculated value E2 of the Hall element X2, the difference between the calculated value E2 and the Hall element X4 with respect to the Hall element X3 is calculated. If the difference is within the range of the determination value, the LED lamps L arranged in the sixth column from the left of the LED lamp group R (the LED lamp L having the second digit number “L” of “L” is “6”). ). On the other hand, if the difference is outside the range of the determination value, the LED lamps L arranged in the fifth column from the left of the LED lamp group R (the LED lamps with the second digit number “L” being “5”) L) is specified. Similarly, the Hall elements Y1 to Y4 specify the LED lamps L of the LED lamp group.

  In the magnet detector 23 of the present embodiment, the position of the magnet 17 is specified in the left and right direction with the hall elements X1 to X4 as a reference with respect to the LED lamp L44, and the hall elements Y1 to Y4 with respect to the LED lamp L44 as a reference. It is specified at which position in the vertical direction the magnet 17 is present. Then, one LED lamp L is specified by the microcomputer 33 at the location where the specified left-right direction and up-down direction intersect. In the direction of the specified LED lamp L, the magnet 17 is present based on the LED lamp L44. For example, when the LED lamp L21 is specified in step S15, the magnet 17 is present obliquely upward to the left with respect to the LED lamp L44. And if the microcomputer 33 specifies one LED lamp L by step S15, it will transfer to step S16.

  The microcomputer 33 that has shifted to step S16 reads the maximum value MX and the maximum value MY from the memory M, and determines whether or not each maximum value is equal to or greater than a predetermined reference value (step S16). The reference value is a value that allows the presence of the magnet 17 to be confirmed when the magnet 17 is detected by the magnet detector 23 of the present embodiment. In the magnet detector 23, there is a possibility that magnetic flux lines other than the magnet 17 (for example, geomagnetism) are detected by the hall elements X1 to X4 and Y1 to Y4. For this reason, the microcomputer 33 excludes detecting other than the magnet 17 through step S16.

  Subsequently, if the determination result in step S16 is affirmative (greater than the maximum value MX and the maximum value MY reference value), the microcomputer 33 performs control to turn on the LED lamp L specified in step S15 (step S17). And the microcomputer 33 performs a process again from step S11 of a magnet detection process.

  On the other hand, if the determination result in step S16 is negative (the maximum value MX and the maximum value MY are less than the reference value), the microcomputer 33 has not detected the magnet 17 and therefore controls to turn off any LED lamps. (Step S18). And the microcomputer 33 performs a process again from step S11 of a magnet detection process.

  In the magnet detector 23 of the present embodiment, the magnet detection process (steps S11 to S18) is performed at a predetermined cycle after the power is turned on and the initial process is completed. For this reason, the information is updated each time, and the LED lamp L is turned on and off. In the present embodiment, the direction in which the magnet 17 exists and the distance are grasped (recognized) by the user with the LED lamp L that is lit, with the LED lamp L44 as a reference. When the LED lamp L closer to the LED lamp L44 is lit, the user (magnet detector 23) is made aware that the magnet 17 has been approached. Then, the user moves the magnet detector 23 so that the central LED lamp L44 is lit. Finally, when the LED lamp L44 is lit, the user is made aware that the magnet 17 is present directly below the magnet detector 23. In the present embodiment, the microcomputer 33 functions as a detection result deriving unit.

Next, the usage method of the magnet detector 23 and the display mode of the LED lamp group R will be described with reference to FIG.
9A to 9C show the Hall elements X1 to X4, Y1 to Y4 and the LED lamp L disposed on the LED substrate 28. FIG. Further, in FIGS. 9A to 9C, the hall elements having the maximum value MX and the maximum value MY are indicated by hatching, and the LED lamps lit by the magnet detection process are indicated by hatching. A square indicated by a broken line indicates the magnet 17. And in FIG. 9, a mode that it approaches the magnet 17 in order of (a)-(c) is shown.

  First, the magnet 17 is separated from the wall material 22 by a predetermined distance so as not to be detected by the hall elements X1 to X4 and Y1 to Y4. When measuring the offset voltages of the Hall elements X1 to X4 and Y1 to Y4, they are separated from the wall material 22 so as not to be affected by the magnetic flux lines. Then, the power switch 27a is pressed to turn on the power, and initial processing is performed. Subsequently, when the initial processing is completed, the power supply LED 26a is turned on, and the user is made aware that the magnet 17 can be detected. Then, the back surface of the magnet detector 23 is directed to the wall material 22 surface on which the wiring box 11 to be detected is disposed, and the front surface is directed to the user. In this state, when the magnet 17 is present at the position shown in FIG. 9A, the Hall element X3 and the Hall element Y1 have the maximum value MX and the maximum value MY. In the magnet detector 23, the LED lamp L13 is turned on. For this reason, the user can recognize that the magnet 17 exists at the upper left with the LED lamp L44 as the center.

  Then, the user moves the magnet detector 23 to the upper left so that the LED lamp L44 is lit. And when the magnet 17 exists in the position shown in FIG.9 (b), Hall element X2 and Hall element Y3 become the maximum value MX and the maximum value MY. In the magnet detector 23, the LED lamp L35 is turned on. For this reason, the user can recognize that the magnet 17 exists a little to the lower right with the LED lamp L44 as the center.

  Then, the user moves the magnet detector 23 to the lower right so that the LED lamp L44 is lit. And when the magnet 17 exists in the position shown in FIG.9 (c), Hall element X2 and Hall element Y3 become the maximum value MX and the maximum value MY. In the magnet detector 23, the LED lamp L44 is turned on. For this reason, the user can recognize that the magnet 17 exists directly under the magnet detector 23. Then, the user presses the magnet detector 23 against the wall material 22 and marks it with the stamp S to detect the magnet 17 and specify the position of the wiring box 11. Then, the user forms a hole corresponding to the wiring box 11 around the place indicated by the stamp S. Then, the wiring box 11 is exposed from the hole, and the wiring box 11 can be wired.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) The microcomputer 33 grasps the voltages generated by the Hall elements X1 to X4 and Y1 to Y4 for each sensitivity (high sensitivity, medium sensitivity, and low sensitivity), and detects how many magnetic flux lines with which sensitivity. It is monitoring whether it is doing. Further, the microcomputer 33 derives the calculated value E2 using a plurality of voltages (all three in this embodiment) generated by the Hall elements X1 to X4 and Y1 to Y4 at each sensitivity. For this reason, measurement values S1 to S3 with three types of sensitivity are added to the calculated value E2 derived by the microcomputer 33. For example, in one sensitivity among the three types, even when the voltage with respect to the detected magnetic flux line causes an oversensitivity, the magnetic flux line is always detected even with a sensitivity other than the oversensitivity. That is, even if there is a sensitivity that causes oversensitivity, the detected magnetic flux 17 is detected based on the sensitivity that does not exceed the sensitivity, so that the detected magnet 17 is not lost. Accordingly, even when the magnet 17 is detected using a plurality of types of sensitivity, the detection can be performed without losing sight of the magnet 17 by switching the sensitivity.

  (2) Further, based on the calculated value E2 of the microcomputer 33, the user is made to recognize whether the user has detected the magnet 17 with the LED lamp L. For this reason, when the user is detecting the magnet 17, the user can recognize whether or not the magnet 17 has been detected by checking the LED lamp L. Therefore, the working efficiency related to detection of the magnet 17 can be improved.

  (3) The microcomputer 33 calculates the calculated value E2 by adding the voltages measured with the three types of sensitivity. For this reason, compared with multiplication and division, the detected voltage can be remarkably reflected in the calculation value E2. Also, by adding, it is possible to prevent the calculation value E2 from becoming larger, especially when compared with multiplication.

  (4) In the microcomputer 33, a limit that can be calculated is determined in advance, and the accuracy of the calculation is deteriorated for the calculation exceeding the limit. For this reason, for example, the calculation result of the calculation value E2 can be made smaller than when the calculation value E2 is calculated by multiplying the measurement values. Therefore, it is possible to prevent the calculation system from deteriorating.

  (5) When the microcomputer 33 uses a microcomputer that has a high calculation limit and can calculate the calculation value E2 with higher accuracy, the weight of the magnet detector 23 itself to which the microcomputer 33 is attached may increase. For this reason, the magnet detector 23 can also be reduced in weight.

  (6) The voltage value (measured values S1 to S3) measured for each sensitivity is multiplied by a predetermined constant. This constant is determined according to the influence of the measured values S1 to S3 for each sensitivity on the calculated value E2. For this reason, the measured values S1 to S3 for each of the three types of sensitivity are provided by providing constants according to the degree to which the measured values S1 to S3 of the Hall elements X1 to X4 and Y1 to Y4 affect the calculated value E2. Can be evened out.

  (7) Amplify the voltage generated from each Hall element X1 to X4, Y1 to Y4 with three types of amplification factors (50 times, 20 times, and 10 times), and measure the voltage value with different amplification factors. Three types of sensitivity are set. That is, the voltage value can be measured with three types of sensitivity only by changing the amplification factor. For this reason, the magnet 17 can be easily detected in a wide range to a narrow range, and the range in which the magnet 17 is detected can be freely changed by changing the amplification factor.

  (8) At least three sets of Hall elements (eight in this embodiment) are provided. For this reason, the position of the magnet 17 can be detected more accurately than in the case where one and two Hall elements are provided. In particular, when there is only one hall element, the user can recognize only whether or not there is a magnet 17. That is, according to the present invention, it is possible to obtain more information regarding the position of the magnet 17 as well as whether or not the magnet 17 is present.

  (9) Moreover, each Hall element X1-X4, Y1-Y4 is arrange | positioned so that the distance between adjacent Hall elements may become equal distance. For this reason, the place where the magnet 17 exists can be determined in advance as compared with the case where the Hall elements are irregularly arranged. And it is also possible to make the user recognize the approximate position of the magnet 17 by associating the places in advance based on the measured values S1 to S3 and the calculated value E2 for each Hall element.

  (10) All the distances between adjacent hall elements are arranged to be equal. Since the hall elements X2, X3, Y2, and Y3 are arranged in an annular shape, when the position of the magnet 17 is finally specified, the user can specify that the magnet 17 is in the center of the circle. It ’s fine. Therefore, the user can finally be surely recognized the position of the magnet 17.

  (11) The position of the magnet 17 is specified based on the comparison result obtained by comparing the calculated value E2 calculated by the microcomputer 33 with the Hall elements X1 to X4 and Y1 to Y4. When the position of the magnet 17 is specified, the LED lamp L notifies the position of the magnet 17 specified by the microcomputer 33 as the position of the magnet 17 with respect to the position of the user (based on the LED lamp L44). did. For this reason, when the position of the magnet 17 is specified by the microcomputer 33, the user can recognize the direction in which the magnet 17 exists from the user (LED lamp L44) with the LED lamp L. Therefore, the user can easily recognize the position of the magnet 17 and the detection of the magnet 17 can be facilitated.

  (12) The microcomputer 33 makes the user recognize that the LED lamp L has detected the magnet 17 when the calculated value E2 based on the measured values S1 to S3 exceeds the reference value. The reference value was set to a value calculated from the measured values S1 to S3 measured by the hall elements X1 to X4 and Y1 to Y4 when the magnet 17 is present within a predetermined range. For this reason, it is possible to prevent the magnet detector 23 from reacting under the influence of magnetic flux lines from other than the magnet 17. That is, it is possible to detect the magnet 17 by preferably detecting the magnetic flux lines generated from the magnet 17.

  (13) A total of eight Hall elements X1 to X4 and Y1 to Y4 are arranged such that four Hall elements X1 to X4 (N = 4) are arranged at equal intervals on the imaginary line K1 (lateral direction). ... Y4 are arranged four (N = 4) at equal intervals on the virtual line K2 (vertical direction). In addition, the LED lamps L are arranged in the horizontal direction at positions corresponding to the Hall elements X1 to X4 and Y1 to Y4 and between the Hall elements and the Hall elements (7 pieces ((2N−1) pieces (N = 4))). 7 ((2N−1) (N = 4))) are arranged in the vertical direction. Therefore, it is specified which of the Hall elements X1 to X4 and Y1 to Y4 is close to the position of the magnet 17 and, further, in which direction the magnet 17 is based on the Hall element specified to be close. Can be identified. Therefore, the user can recognize the position of the magnet 17 more accurately.

  (14) The LED lamps L are arranged in a matrix of 7 rows ((2N-1) rows (N = 4)) and 7 columns ((2N-1) columns (N = 4))). I did it. For this reason, the ratio of the left-right direction (horizontal direction) and the up-down direction (vertical direction) can be made into the same ratio. Therefore, when the magnet 17 is detected in the vertical direction and the horizontal direction, the magnet 17 can be detected in the same manner. Since the LED lamps L are arranged in a matrix, the space on the magnet detector 23 can be used without waste, and the presence and direction of the magnet 17 can be specified over a wider range.

In addition, in the said embodiment, it can materialize in another embodiment (another example) as follows.
In the above embodiment, the Hall element and the amplifying unit may be integrated. In this case, the Hall element itself outputs voltages with different sensitivities to the microcomputer 33. Further, the amplification unit and the microcomputer 33 may be integrated. In this case, the sensitivity can be switched by the microcomputer 33 itself. For this reason, the connection line which connects the microcomputer 33 and amplification part 32a-32h can be abbreviate | omitted, and a control structure can be simplified.

  In the above embodiment, in the calculation performed by the microcomputer 33 in step S14 of the initial process and the magnet detection process, the calculated value E1 and the calculated value E2 are obtained by subtracting or multiplying the measured values S1 to S3 at each sensitivity. Anyway. Alternatively, the calculation may be performed simply by adding the measurement values S1 to S3 measured at each sensitivity.

  -In the said embodiment, the kind of sensitivity may be changed arbitrarily and may be 2 types and 4 types or more. For example, when four or more types are used, the value of a constant multiplied by the measured values S1 to S3 at each sensitivity is also changed in the magnet detection process.

  In the above embodiment, the amplification factor may be arbitrarily changed or may be a combination of 70 times, 30 times, 15 times, and the like. For example, when the magnet 17 is roughly detected, the amplification factor is set to be relatively large, and when the magnet 17 is detected more accurately, the amplification factor is set to be relatively small. By doing so, the magnet detector 23 corresponding to the application can be created. In this case, the constant value to be multiplied by the measured value is also changed in accordance with the amplification factor.

  In the above embodiment, the number of Hall elements may be arbitrarily changed such as 3, 4, 9, or more. For example, it is possible to detect the position of the magnet 17 more accurately by providing more Hall elements than in the embodiment so that nine or more Hall elements are provided.

  In the above embodiment, the number of LED lamps may be arbitrarily changed. Further, for example, a total of nine LED lamps may be arranged at the same position and in the center as the Hall elements X1 to X4 and Y1 to Y4. The number and arrangement of the LED lamps may be any number and arrangement that can finally identify the position of the magnet 17.

  In the above-described embodiment, the calculation value E2 may be calculated using two voltages detected from the three types of sensitivity. Alternatively, a voltage may be detected with four or more sensitivities, and a calculation value E2 may be calculated using voltages detected with some (two or more) sensitivities.

  In the above embodiment, the number to be multiplied or added to the voltage value for each sensitivity may be a variable that varies based on the calculation results of the calculation value E1 and the calculation value E2. That is, a suitable detection result can be derived by setting a suitable variable for the calculation results of the calculation value E1 and the calculation value E2. Further, the ratio of the numbers to be multiplied or added to each sensitivity may be fixed or variable. For example, when the magnet 17 is away from the magnet detector 23, the low sensitivity variable may be reduced, and when the magnet 17 is close to some extent, the low sensitivity variable may be increased.

  In the above embodiment, a recognition unit may be configured by a liquid crystal display, and the user may recognize the direction in which the magnet 17 exists based on the display content of the liquid crystal display. In this case, the display allows the user to recognize the direction of the magnet 17 by a display imitating the LED lamp L as in the above embodiment, or simply allows the user to recognize the direction of the magnet 17 with an arrow or the like. May be.

  In the above embodiment, the reference value is not set, and the processing of step S16 and step S18 may be omitted in the magnet detection processing. By doing so, it is possible to reduce the burden associated with the magnet detection processing of the microcomputer 33.

In the above embodiment, the arrangement method of the Hall elements X1 to X4 and Y1 to Y4 may be arbitrarily changed, for example, by arranging them all in a straight line.
In the above embodiment, the recognition means may be constituted by a plurality of light bulbs or lamps.

-In above-mentioned embodiment, when the position where the magnet 17 exists is specified, you may make it alert | report to a user the direction where the magnet 17 exists with the some LED lamp L. FIG.
Next, a technical idea that can be grasped from the above embodiment and another example will be added below.

  (A) When the detection result deriving unit exceeds the reference value indicating that the magnet exists, the recognition unit allows the user to recognize the position of the magnet while the calculation unit calculates the calculation value. 8. The magnet detector according to claim 7, wherein when the value does not exceed the reference value, the recognition unit does not allow a user to recognize the position of the magnet. 9.

The partially broken perspective view which shows the use condition of a magnet detector. (A) is a front view which shows the case front. (B) is a front view which shows an LED board. The front view which shows a case rear surface. The front view which shows a sensor board | substrate. The block diagram which shows a control structure. The block diagram which shows the structure of an amplifier. The graph which shows the relationship between a magnetic flux line and a calculated value. The flowchart which shows a magnet detection process. (A)-(c) is explanatory drawing explaining the usage method of a magnet detector.

Explanation of symbols

  X1 to X4, Y1 to Y4 ... Hall elements (magnet detection means, magnet sensor), E2 ... calculated value, L ... LED lamp (light emitter), R ... LED lamp group (recognition means), OP ... amplifier (amplification means) SW ... switch (amplifying means), 11 ... wiring box, 17 ... magnet, 22 ... wall material, 23 ... magnet detector, 32a to 32h ... amplifying unit (magnet detecting means, amplifying means), 33 ... microcomputer ( Detection result deriving means).

Claims (8)

In a magnet detector for detecting a magnet provided on an arrangement body such as a wiring box arranged on the back side of a concealing material such as a wall material of a building from the front side of the concealing material,
Magnet detecting means for detecting the magnetic force of the magnet with a plurality of types of sensitivity and generating a voltage based on the strength of the magnetic force detected for each sensitivity.
Detection result deriving means for deriving a detection result of the magnet using a plurality of voltage values from among the voltage values for each sensitivity generated by the magnet detection means;
A magnet detector, comprising: a recognition means for notifying the detection result derived by the detection result deriving means and allowing a user to recognize whether or not the magnet has been detected. The detection result deriving unit calculates a sum or difference of voltage values for each sensitivity generated by the magnet detection unit, and derives a detection result of the magnet based on the calculated value. The magnet detector according to 1. The magnet detector according to claim 2, wherein the detection result deriving unit derives the detection result in consideration of an influence of the detection result for each sensitivity on the detection result. The detection result deriving means adds or multiplies a predetermined constant to the voltage value for each sensitivity, and also adds or multiplies the constant or adds or multiplies the voltage value after multiplying the constant. And
The magnet detector according to claim 2, wherein the constant is determined according to an influence of the detection result for each sensitivity on the detection result. The magnet detecting means includes one magnet sensor and an amplifying means for amplifying a voltage generated by the magnet sensor, and the plurality of types of sensitivities are obtained by changing the amplification factor of the voltage by the amplifying means to a plurality of types. It sets, The magnet detector as described in any one of Claims 1-4 characterized by the above-mentioned. Having at least three sets of the magnet detection means;
6. The magnet detector according to claim 5, wherein the magnet sensors constituting each magnet detecting means are arranged such that the distance between adjacent magnet sensors is equal. The detection result deriving unit calculates the calculation value for each of the magnet detection units, and specifies the position of the magnet with respect to the magnet sensor as the detection result based on a comparison result obtained by comparing the calculation values. ,
The magnet detector according to claim 6, wherein the recognizing unit notifies the position of the magnet specified by the detection result deriving unit as the position of the magnet with respect to the position where the user has performed the detecting operation. Having the magnet detection means comprising at least four or more sets;
The number of sets is the number of the magnet sensors arranged in the vertical direction when the magnet sensors are arranged on the vertical and horizontal straight lines orthogonal to each other so as to be symmetrical with respect to the straight lines. The number of the magnet sensors arranged in the lateral direction is the same number,
The recognition means is configured by arranging a plurality of light emitters in a matrix, and the number of light emitters in each row and each column is the number of the magnet sensors arranged in each of the vertical direction and the horizontal direction. When N, it is set to (2N-1),
The detection result deriving means is a position of the magnet relative to the magnet sensor as the detection result based on a detection result of the magnet sensor arranged in the vertical direction and a detection result of the magnet sensor arranged in the horizontal direction. Identify
The recognition means notifies the position of the magnet with respect to the position where the user has performed the detection operation by causing the light emitter corresponding to the position of the magnet specified by the detection result deriving means to emit light. The magnet detector according to claim 5.

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