JP2000187065A - Magnetic sensor unit and magnetic field measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic field measuring device for quickly measuring the strength distribution of a generated magnetic field in three dimensions with a single deflected yoke. SOLUTION: A plurality of magnetic sensors are arranged in almost whole region of a magnetic sensor unit 20 having a three-dimensional shape capable of inserting a deflected yoke to be measured. Each of the magnetic sensors is driven in turn by the command of CPU 31 by way of a sensor drive switching circuit 32. The driven magnetic sensor generates current corresponding to magnetic flux density based on the magnetic field generated by the deflected yoke 23. The generated current is controlled to be taken out by a sensor output switch circuit 34 controlled in linking with the sensor drive switch circuit 32. The taken-out current value converted to voltage value is taken in the CPU 31 by way of a sensor output take-in circuit 33 and preserved in a memory 41 as detected data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic sensor unit and a magnetic field measuring device, and more particularly to a magnetic sensor unit and a magnetic field measuring device for measuring a magnetic flux density of a magnetic field generated by a deflection yoke attached to a cathode ray tube or the like. Things.

[0002]

FIG. 13 is a schematic sectional view showing the structure of a general cathode ray tube or display tube. Referring to the figure, an electron beam 63 emitted from an electron gun 62 is deflected in a predetermined direction by a magnetic field generated by a deflection yoke 23 and illuminates a phosphor screen 64 via a shadow mask (not shown). I do. The phosphor screen 64 sequentially irradiated by the scanning of the electron beam 63 emits light,
Form an image.

FIG. 14 is an exploded perspective view of the deflection yoke 23 attached to FIG. Referring to the drawing, a horizontal deflection coil 36 for deflecting an electron beam in a horizontal direction is wound around a cylindrical core 66 of the deflection yoke 23, and further deflects the electron beam in a vertical direction thereon. Vertical deflection coil 38 is attached. The deflection yoke 23 is configured as described above. By controlling the intensity of the current of the horizontal deflection coil 36 and the vertical deflection coil 38, the generated magnetic field is controlled, and the electron beam 63 is controlled.
Is deflected in a desired direction. Therefore, the deflection yoke is an important component in a cathode ray tube or the like, and determines its performance (focus, convergence, purity).

[0004]

As described above, the deflection yoke 23 is made into a finished product by assembling the horizontal deflection coil 36 and the vertical deflection coil 38 on the core 66, and this finished product is attached to a cathode ray tube and the image shown on the cathode ray tube is obtained. From the state, the quality of the deflection yoke 23, that is, the magnetic field distribution was inspected. When the state of the image is poor, a method has been adopted in which a ferromagnetic material such as ferrite is attached to the gap between the deflection yoke 23 and the cathode ray tube 61 and the image is inspected again.
Therefore, in this method, the inspection requires skill and the inspection is troublesome, which hinders a quick CRT inspection. In addition, since the deflection yoke 23 alone cannot be evaluated by this method, when the deflection yoke 23 is manufactured separately from the cathode ray tube main body, a large amount of defects of the deflection yoke are found only after the deflection yoke 23 is assembled to the cathode ray tube. Not.

On the other hand, as another image inspection method, there is a method of measuring the magnetic field distribution of the deflection yoke alone. As a method, one magnetic field measurement sensor is moved to each measurement point in the deflection yoke to measure the magnetic field sequentially. However, in this inspection method, since one magnetic field measurement sensor is moved to each measurement point of the deflection yoke to measure the magnetic field, it takes a considerable time to measure the magnetic field distribution of the entire deflection yoke. Therefore, it can be said that it is substantially impossible to individually inspect a large number of deflection yokes in the manufacturing process.

An object of the present invention is to provide a magnetic sensor unit and a magnetic field measuring device capable of quickly and independently inspecting the magnetic field distribution of a deflection yoke by using the deflection yoke alone. And

[0007]

According to the first aspect of the present invention,
A magnetic sensor unit for measuring a magnetic field generated by a deflection yoke attached to a cathode ray tube or the like, wherein the magnetic sensor unit has a flat plate shape arranged at predetermined intervals in a central axis direction and at right angles to the central axis direction. A plurality of substrates corresponding to the three-dimensional shape formed by connecting the outer peripheral edges of the deflection yoke to be measured, and the magnetic field at the position where the three-dimensional shape is arranged and disposed on each of the substrates; And a plurality of magnetic sensors for detecting the magnetic flux density of the magnetic field.

With the above-described configuration, each magnetic sensor detects the magnetic flux density of the magnetic field generated by the deflection yoke at the position where each magnetic sensor is arranged. According to a second aspect of the present invention, in the configuration of the first aspect, the magnetic sensor comprises a Hall element, and the Hall elements are arranged on each surface of the substrate in a matrix comprising rows and columns. .

With this configuration, the degree of integration of the magnetic sensor in the magnetic sensor unit can be increased.
According to a third aspect of the present invention, in the configuration of the second aspect, each of the plurality of hall elements is provided corresponding to a row of the hall element, and is connected to the first voltage application terminal of the hall element in the corresponding row. A plurality of row address lines and a plurality of column addresses provided in a direction intersecting the row address lines and corresponding to the columns of the hall elements and connected to the second voltage application terminals of the hall elements in the corresponding columns; A line and one of a row address line and a column address line in response to a first input signal, and applying a voltage to a Hall element connected to the selected row address line and column address line. A magnetic sensor selecting means for setting a state, and a pair of output lines each provided corresponding to a row or a column of the Hall element, each of the output line pairs being the first of the Hall elements of the corresponding row or column. Current sensing terminal and the second A plurality of output line pairs connected to each of the current sensing terminals, each between a first current sensing terminal of the Hall element and one of the output line pairs connected thereto, and a second current sensing of the Hall element; A plurality of pairs of switching means mounted between the terminal and the other of the pair of output lines connected thereto;
An output selection unit that, in response to the second input signal, turns on only a switching pair connected to the Hall element that is turned on by the selection unit out of the switching unit pair.

[0010] With the above configuration, the wiring connected to the magnetic sensor can be efficiently arranged. According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, all of the magnetic sensors are orthogonal to the Z direction which is the axial direction of the deflection yoke to be measured. It is arranged so as to detect the magnetic flux density in one of the X direction and the Y direction orthogonal to the Z direction and the X direction.

With the above configuration, the magnetic sensor for detecting the magnetic flux density in each of the X, Y, and Z directions is one.
Since the number of magnetic sensors that detect the magnetic flux density in one direction can be increased as compared with those arranged in one unit, the detection accuracy of the magnetic sensors is improved. The magnetic field measuring device according to claim 5, which is a magnetic field measuring device for measuring a generated magnetic field of a deflection yoke attached to a cathode ray tube or the like, has a three-dimensional shape that can be inserted into an inner wall surface of the deflection yoke to be measured.
A magnetic sensor unit including a plurality of magnetic sensors arranged at positions corresponding to substantially the entire region of a magnetic field generated by the deflection yoke, and a deflection driving at least one of a horizontal deflection coil and a vertical deflection coil of the deflection yoke to be measured. With the coil driving means and the magnetic sensor unit inserted in the deflection yoke to be measured, the number of magnetic sensors is divided into a plurality of blocks having substantially the same number, and the magnetic sensors included in each block are sequentially driven in parallel for each block Magnetic sensor driving means, sensor output capturing means for sequentially capturing sensor outputs detected from each of the driven magnetic sensors in parallel for each block, and a magnetic flux density for each magnetic sensor based on the captured sensor output. Calculating means for calculating, based on the position of the magnetic field space of the deflection yoke corresponding to the arrangement of the magnetic sensor Calculated magnetic flux density is obtained and a display means for displaying.

With the above configuration, the sensor output of the magnetic sensor for each block is sequentially taken in parallel for each block, so that the processing of the detection data of the entire magnetic sensor is accelerated. According to a sixth aspect of the present invention, in the configuration of the fifth aspect, a standard magnetic field generating means for generating a desired standard magnetic field, and a magnetic sensor unit are provided in the standard magnetic field generating means,
Calibration data storage means for storing calibration data for each magnetic sensor such that the magnetic flux density detected and calculated by each magnetic sensor becomes the magnetic flux density of the standard magnetic field, and based on the stored calibration data, Control means for controlling the calculation means so as to calculate the magnetic flux density based on the output.

With the above configuration, the accuracy of detecting the magnetic flux density of the magnetic sensor unit as a whole increases even if the magnetic sensors vary in sensitivity. According to a seventh aspect of the present invention, in the configuration of the sixth aspect, three types of magnetic sensor units are prepared, and each type of magnetic sensor unit has a Z direction that is the axial direction of the deflection yoke to be measured.
The magnetic sensors are arranged so as to detect the magnetic flux densities in the X direction orthogonal to the Z direction and the Y direction orthogonal to the Z direction and the X direction, respectively, and the calculating means is arranged in each magnetic sensor unit. The magnetic flux density in a desired direction at the position of the magnetic sensor is calculated based on the sensor output taken from each of the detected magnetic sensors.

With the above configuration, the number of magnetic sensors for detecting the magnetic flux density in one direction can be increased, so that the detection accuracy of the magnetic sensors is improved.

[0015]

As described above, according to the first aspect of the present invention, since the three-dimensional distribution of the magnetic flux density of the deflection yoke can be grasped, the performance of the deflection yoke can be accurately detected. As a result, the deflection yoke can be quantitatively and analytically analyzed and evaluated.In addition, it is effective for inspection of a winding machine and a die molding in a manufacturing process of the deflection yoke, and the frequency of re-correction of the deflection yoke can be reduced. Can be reduced. Further, when attaching the ferromagnetic material for re-correction, it is also possible to designate a place to be attached in a state where the deflection yoke is alone.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the distribution of the magnetic flux density can be grasped more minutely, and the inspection accuracy of the deflection yoke can be further improved. According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, the wiring connected to the magnetic sensor can be efficiently arranged, so that the magnetic sensors can be arranged at a higher density.

According to a fourth aspect of the present invention, in addition to the effect of the first aspect of the present invention, in the X direction,
By preparing three types of units for detecting the magnetic flux density in each of the Y direction and the Z direction, the magnetic flux density distribution of the deflection yoke can be grasped more minutely. According to the fifth aspect of the present invention, since the data of each magnetic sensor is sequentially worked in parallel for each block, the time required for the inspection process for each deflection yoke can be reduced.

According to the sixth aspect of the present invention, in addition to the effects of the fifth aspect of the invention, a highly reliable magnetic field measuring apparatus can be provided regardless of variations in sensitivity of individual magnetic sensors. According to the seventh aspect of the invention, in addition to the effect of the sixth aspect of the invention, it is possible to inspect the deflection yoke with higher accuracy.

[0019]

FIG. 1 is a diagram showing a schematic configuration of a magnetic field measuring apparatus according to a first embodiment of the present invention.
Referring to the figure, a magnetic field measuring device 19 includes a measuring jig 24 for installing a deflection yoke 23 to be measured, and a measuring jig 24.
, A magnetic sensor unit 20 for measuring a magnetic field generated by the deflection yoke 23, a driving power supply for driving the deflection yoke 23, and a magnetic sensor provided in the magnetic sensor unit 20. A system rack 21 in which a control device and the like for sequentially bringing the units into a driving state and capturing a detected sensor output are stored;
A display 22 for displaying magnetic field data processed in the system rack 21. still,
The magnetic sensor unit 20 and the deflection yoke 23 are wired and connected to the system rack 21 as shown.

FIG. 2 is a block diagram showing a specific configuration of the magnetic field measuring device shown in FIG. Referring to the figure, this magnetic field measuring apparatus is configured around CPU 31. The CPU 31 has a horizontal deflection coil driving circuit 37 for generating a magnetic field by flowing a predetermined current through the horizontal deflection coil 36 of the deflection yoke 23 to be measured, and a predetermined current through the vertical deflection coil 38 of the deflection yoke 23. A vertical deflection coil driving circuit 39 for flowing and generating a magnetic field is connected to each other. In a normal inspection, the horizontal deflection coil driving circuit 37 and the vertical deflection coil driving circuit 39
Are driven to generate a magnetic field in the deflection yoke 23, but in order to inspect the state of generation of the magnetic field only in the horizontal deflection coil or the vertical deflection coil, the horizontal deflection coil driving circuit 3
The CPU 31 may control such that only one of the drive circuit 7 and the vertical deflection coil drive circuit 39 is driven.

The CPU 31 is connected to a plurality of magnetic sensors (details will be described later) arranged in the magnetic sensor unit 20, and a sensor drive switching circuit 32 for sequentially driving desired magnetic sensors is connected to the CPU 31. Have been. A constant current circuit 35 is connected to the sensor drive switching circuit 32. When a constant voltage is applied to drive the magnetic sensor, the internal resistance of the magnetic sensor fluctuates depending on the temperature of the test atmosphere, and the output fluctuates. This is to prevent the occurrence. That is, the CPU 31 also controls the constant current circuit 35 to prevent the magnetic sensor driven by the sensor drive switching circuit 32 from affecting the detection output due to the ambient temperature.

The CPU 31 is connected via an amplifier 40 to a sensor output take-in circuit 33 connected to each of the magnetic sensors arranged in the magnetic sensor unit 20. The reason why the sensor output capture circuit 33 is connected to the CPU 31 via the amplifier 40 is that the output of the magnetic sensor due to the generated magnetic field is very small (2 to 10 mV) and needs to be amplified (500 times gain). It is. Note that an active low-pass filter (not shown) is provided in the sensor output capturing circuit 33 in order to reduce noise with respect to the detection output.

Further, the CPU 31 is connected to the magnetic sensor unit 20 and, in response to the driving operation of the sensor drive switching circuit 32, causes the CPU 31 to capture the output of the desired magnetic sensor via the sensor output capturing circuit 33. For this purpose, a sensor output switching circuit 34 for switching the output of the magnetic sensor is connected. The CPU 31 further includes a memory 41 for storing and storing the sensor output captured via the sensor output capturing circuit 33 and the amplifier 40;
42 for outputting magnetic field data stored in the printer
And a display 22 for displaying the detected magnetic field data.

In this embodiment, each circuit, a printer, a memory, etc. are stored around the CPU 31 in the system rack 21, but the storage location is not limited. FIG. 3 shows a part of a magnetic sensor arranged in the magnetic sensor unit 20 shown in FIG. 2 and a circuit arrangement connected to the magnetic sensor.

Incidentally, three types of magnetic sensor units 20 are provided for the deflection yoke to be measured. As shown in FIG. 14, each magnetic sensor unit is based on the center axis direction of the deflection yoke as shown in FIG. The directions of the magnetic sensors are aligned so as to measure the strength of the magnetic field in the X, Y, and Z directions orthogonal to each other. Referring to the drawing, magnetic sensors S are arranged in a matrix composed of rows and columns. The sensitivity of the magnetic sensor S is about 10 mV / 100 gauss, and the temperature coefficient when driven by a constant current power supply is 0.06.
% / ° C is used. The reason why the magnetic sensors are arranged in a matrix is that if the magnetic sensors are arranged at random, the degree of integration of the magnetic sensors cannot be improved, and the wiring connected to the magnetic sensors cannot be arranged efficiently. The magnetic sensor S1, which is one of the magnetic sensors S, includes:
A first voltage applying terminal T1 and a second voltage applying terminal T2 for applying a driving voltage, and a first current applying terminal T3 and a second current applying terminal T3 for extracting a current generated by generation of a magnetic field.
And a current application terminal T4.

A plurality of row address lines C 1 to CN are provided corresponding to each row of the magnetic sensor S, and each of the row address lines is connected to a row decoder 44. Also, the row address line C
Are connected to the first voltage application terminal T1 of each of the magnetic sensors S in the corresponding row via a diode D for blocking the flow of current in the reverse direction. On the other hand, column address lines R1 to RN are provided in a direction crossing the row address lines C and corresponding to the columns of the magnetic sensors S, and each of the column address lines is connected to the column decoder 46. Each of the column address lines is connected to the second voltage application terminal T2 of each of the magnetic sensors S in the corresponding column. By arranging the row address lines and the column address lines on the matrix in this manner, the total number of wirings can be reduced. That is, if there are 1000 magnetic sensors, the wiring connected to them is usually 2
000 wires are required, but if the wiring is arranged in a matrix and the magnetic sensor is arranged at the intersection of these,
Processing can be performed with 64 (32 × 32 = 1024) wirings.

The first current application terminal T3 of each magnetic sensor S is connected to a semiconductor relay (trade name: Opto Mos, Ph)
o Mos) is connected to an output line Ob serving as a common bus via Pb, and a second current application terminal T4 of the magnetic sensor S is connected to an output line Oa serving as a common bus via a semiconductor relay Pa. ing. One end of each of the output lines Oa and Ob is connected to the sensor output unit 30, respectively.
The reason why the output line is a pair of common bus systems is that the detection output of the magnetic sensor to be taken out is always one, so
This is to reduce the wiring space occupied by the output lines as much as possible by using a common bus method and to improve the degree of integration in the entire arrangement of the magnetic sensors.

FIG. 4 is a diagram showing a detailed wiring structure of the semiconductor relay of FIG. Referring to the drawing, each of the semiconductor relays is arranged in a matrix composed of rows and columns similarly to the magnetic sensor. Since the semiconductor relay is connected to each of the first current application terminal T3 and the second current application terminal T4 of the magnetic sensor as described above, it has a pair structure. Each of the semiconductor relays includes a light emitting diode 48 and a photoelectric conversion element 49. The reason why the electromagnetic relay is not used is that a magnetic field is generated during the operation of the electromagnetic relay, so that the output of the magnetic field detected by the magnetic sensor S is affected or the magnetic sensor S is prevented from malfunctioning. Output switching lines A for driving a pair of semiconductor relays are arranged in the row direction in this embodiment, and each is connected to the decoder 43.

Next, the operation of the magnetic field measuring apparatus according to this embodiment will be described with reference to FIGS. First, the deflection yoke 23 to be measured is stored in the installation portion 26 of the measuring jig 24 made of a non-magnetic material such as a synthetic resin and set so as not to be displaced. Then, the horizontal deflection coil 36 and the vertical deflection coil 38 of the deflection yoke 23 are connected to each of the horizontal deflection coil drive circuit 37 and the vertical deflection coil drive circuit 39 by wiring. Next, in this state, first, the magnetic sensor unit 20 for detecting the magnetic field strength in the X direction is inserted into a space formed by the inner wall of the deflection yoke 23 and set at a predetermined position so as not to be displaced. The magnetic sensor unit 20 is individually manufactured according to the shape of the deflection yoke 23 to be measured having the same shape, and when replacing the magnetic sensor unit 20 depending on the shape of the deflection yoke 23,
The connection with the sensor drive switching circuit 32, the sensor output take-in circuit 33, and the sensor output switching circuit 34 is made to a new magnetic sensor unit, and then inserted into the deflection yoke 23.

After setting the magnetic field measuring device in this way,
The CPU 31 supplies predetermined signals for driving the horizontal deflection coil 36 and the vertical deflection coil 38 of the deflection yoke 23 to the horizontal deflection coil drive circuit 37 and the vertical deflection coil drive circuit 39. As a result, the horizontal deflection coil drive circuit 37 and the vertical deflection coil drive circuit 39 are driven, and a predetermined voltage is applied to the horizontal deflection coil 36 and the vertical deflection coil 38 of the deflection yoke 23. Thereby, the deflection yoke 23 generates a magnetic field. The deflection yoke is normally driven by an alternating current (trapezoidal wave) when mounted on a cathode ray tube, but is driven by a direct current to detect a magnetic field distribution. Horizontal deflection coil 3
6 is about 15V, 6A, the vertical deflection coil 38 is about 15V,
Drive at 1A to obtain a magnetic field distribution. The intensity of the generated magnetic field usually ranges from about 1 to 50 Gauss.

Next, the CPU 31 sets the constant current circuit 35 in a driving state, and sends a signal for designating a magnetic sensor to be measured to the sensor drive switching circuit 32. As a result, the sensor drive switching circuit 32 drives the row decoder 4 functioning as a magnetic sensor selecting means to drive the designated magnetic sensor.
4 and a column decoder 46 (a first input signal). The designation of the magnetic sensor will be described below assuming that the magnetic sensor S1 is designated in FIG.

When the magnetic sensor S1 is designated, the row decoder 44 sets the row address line C1 to the sensor drive switching circuit 3
The circuit is brought into a conductive state with the constant current circuit 35 through the line 2. On the other hand, the column decoder 46 makes the column address line R1 conductive with, for example, the ground terminal. In this case, the other row address lines and column address lines are kept off. Thus, a voltage is applied between the first voltage application terminal T1 and the second voltage application terminal T2 of the magnetic sensor S1, and the constant current circuit 3
By the constant current control of 5, a predetermined current flows through the magnetic sensor S1. The conducting column address line R1 is connected to the second voltage application terminal T2a of the magnetic sensor Sa in the adjacent row, but is located upstream of the first voltage application terminal T1a of the magnetic sensor Sa. Since the diode Da is disposed, there is no possibility that a current is generated in the magnetic sensor Sa.

The magnetic sensor unit 20 includes a deflection yoke 23
, A magnetic field is also generated at the position where the magnetic sensor S1 is disposed. Therefore, when a predetermined current flows between the terminal T1 and the terminal T2 of the magnetic sensor S1, a current corresponding to the strength of the magnetic field is supplied to the magnetic sensor S1.
Occurs between the current application terminal T3 and the second current application terminal T4. In this state, the decoder 43 functioning as an output selection means receives the instruction output of the CPU 31 via the sensor output switching circuit 34, turns on the output switching line A1, and applies a predetermined voltage to the light emitting diode 48 of the semiconductor relay Pa1. I do. As a result, the semiconductor relays Pa1 and Pb1 functioning as a switching pair enter a conductive state. Therefore, the first current application terminal T of the magnetic sensor S1
The current appearing at each of the third and second current application terminals T4 appears on the output lines Oa and Ob, and is taken in the sensor output taking circuit 33 as a generated voltage based on the magnetic field strength at the position of the magnetic sensor S1. The generated voltage as analog data captured by the sensor output capturing circuit 33 is amplified by the amplifier 40, converted into digital data, captured by the CPU 31 as digital data, and stored in the memory 41 as detection data of the magnetic sensor S1. .

When the detection of the detection data by the magnetic sensor S1 is completed, the column decoder 46 is turned on by the column decoder 46 while the conduction state of the row address line C1 of the row decoder 44 is maintained.
1 is turned off, and then the column address line R2 is turned on. With the change of the conduction state of the column decoder 46, the decoder 43 also sets the output switching line A1 to the non-conduction state,
Instead, the output switching line A2 is made conductive to apply a predetermined voltage to the semiconductor relays Pa2 and Pb2. As a result, the detection output of the magnetic sensor S2 is
1 and the memory 41 via the sensor output take-in circuit 33.
Can be captured.

When the scanning of one row is completed by the driving of the column decoder 46, the row decoder 44
Makes the row address line C1 non-conductive, and instead makes the row address line C2 conductive. Subsequently, the column decoder 4
6 makes the column address line R1 conductive, and
Reference numeral 3 sets a desired output switching line A to a conductive state to make a corresponding semiconductor relay of the magnetic sensor conductive. In this way, the detection outputs of the magnetic sensors arranged in a matrix can be sequentially taken into the memory 41 in association with the magnetic sensors.

When the measurement by the magnetic sensor unit 20 for detecting the magnetic field intensity in the X direction is completed, the magnetic sensor unit 20 for detecting the magnetic field intensity in the Y direction is set on the same deflection yoke, and the measurement is performed in the same manner as described above. , Y-direction detection data. When the measurement of the magnetic field strength in the Y direction is completed, finally, the magnetic sensor unit 20 for detecting the magnetic field strength in the Z direction is set on the same deflection yoke, and the detection data is similarly captured. Thus, the measurement process for one deflection yoke is completed. The memory 41 stores the magnetic field strengths in the X, Y, and Z directions at the positions of the magnetic sensors arranged at the same position for each of the measured deflection yokes. Based on these data, the measured deflection is measured. The magnetic field strength of the yoke can be grasped three-dimensionally.

FIG. 5 is a schematic configuration diagram for explaining the operation when the circuit arrangement including the magnetic sensors shown in FIG. 3 is processed for each block. Referring to FIG.
The magnetic sensors arranged in one magnetic sensor unit are divided into a plurality of blocks so that the numbers thereof are substantially equal. In this embodiment, the number of blocks is 10 from B1 to B10, and in this embodiment, the total number of magnetic sensors is 1000. Therefore, the number of magnetic sensors included in each block is 100. . CPU3
The instruction output from the start of the test from No. 1 is a constant current circuit 35a.
To the row decoder 44 and the column decoder 46 of each of the blocks B1 to B10 via. On the other hand, the detection data of the magnetic sensors sequentially worked by the decoder 43 of each block is output from the sensor output taking circuits 33a to 33j.
Is input to the CPU 31 via the. That is, the row decoder 4
The column decoder 4, the column decoder 46, and the decoder 43 function as a switching circuit (scanner) for driving the individual magnetic sensors and taking in the detection output.

As described above, the CPU 31 performs the parallel processing for each block, so that the detection output of the magnetic sensor in the entire magnetic sensor unit is taken in more quickly. That is, if the processing is divided into ten systems as ten blocks as described above, for example, in the case of one system, it takes 10 ms for the output of one magnetic sensor to stabilize.
If ec is required, it can be substantially processed in one tenth of the time. Also, if there is only one extraction output take-out terminal, it is necessary to switch this 1000 times and take in. However, if processing is performed in 10 systems, the number of take-ups will be one-tenth of 100 times. The time can be significantly reduced.

FIG. 6 is a side view showing a specific configuration of the magnetic sensor unit according to the first embodiment of the present invention. FIG. 7 is an enlarged view of a portion "X" in FIG. 6, and FIG. FIG.
VIII-VIII. Referring to these figures, the magnetic sensor unit 20 has 12 substrates L1 to L12 made of a non-magnetic material such as epoxy glass so as to form a shape corresponding to the three-dimensional shape formed by the inner wall surface of the deflection yoke to be measured. Are connected at a predetermined interval E (10 mm). In the magnetic sensor unit according to this embodiment, since the deflection yoke to be measured has a circular cross section perpendicular to the axial direction, each planar shape of the substrate L has a circular shape. Substrates L1 to L12
Are arranged at positions of planes Z1 to Z12 defined by the pitch E from the rear to the front. The diameter Da of the substrate L1 is 29 mm, and the diameter Db of the substrate L12 is 120 mm. Then, the substrates L1 to L
6 have the same diameter shape, and the substrates L7 to L12
Has a shape such that its diameter increases sequentially toward the front.

As shown in FIG. 7, each of the substrates L1 to L12 is composed of an upper substrate La and a lower substrate Lb, and these substrates and adjacent substrates are connected to each other by round bar-shaped connecting members. They are connected by 53. In this embodiment, a plurality of magnetic sensors S are arranged on the surface of the upper substrate La, and a plurality of semiconductor relays P are arranged in a matrix on the surface of the lower substrate Lb.

FIG. 9 is an enlarged sectional view taken along line IX-IX of FIG. Referring to the figure, in the magnetic sensor unit according to this embodiment, as described above, in order to more finely detect the intensity distribution of the magnetic field generated by the deflection yoke, the magnetic sensor S, the semiconductor relay P, and the connection to these components are provided. Wiring circuits are arranged at a high density. Therefore, in order to efficiently arrange these circuits, each of the upper substrate La and the lower substrate Lb adopts a composite substrate structure including four substrate layers. Specifically and magnetic sensor S is disposed on the outer surface of the upper substrate La, circuit 57 on the lower surface of each of the top and the substrate La ₁ ～La ₃ substrate La ₁ constituting an upper substrate La is located I have. In order to electrically connect the circuits 57 formed on each substrate to each other, through holes 56 are formed at predetermined positions in each substrate.

An external connection terminal 54 for connecting a connection cord 55 for electrical connection with the outside is formed near the outer peripheral edge of the upper substrate La. External connection terminal 54
Is configured such that a predetermined circuit 57 disposed on a substrate constituting the upper substrate La is electrically connected. still,
The total thickness T ₁ of the upper substrate La has become a 0.5~0.6mm.

On the other hand, the lower substrate Lb also has a composite structure composed of four substrate layers, and a plurality of semiconductor relays P are arranged at predetermined positions on the surface of the substrate on the upper substrate La side. . Top and the substrate Lb ₁ ～Lb Likewise circuit 57 to the lower surface of the _third substrate Lb ₁ constituting the lower substrate Lb and is disposed, each substrate to each other are electrically connected via a through-hole 56. Then, the upper substrate La and the lower substrate L
b is electrically connected to each other by a connection plug 58. Incidentally total thickness T ₂ of the lower substrate Lb is 0.5~0.6mm
It has become. The distance H between the upper substrate La and the lower substrate Lb is 5 mm. By configuring each substrate L in this manner, the arrangement and the circuit arrangement of the magnetic sensor S and the semiconductor relay P with a high degree of integration are enabled.

Incidentally, since each magnetic sensor has a variation in sensitivity, it is necessary to calibrate the sensitivity. The sensitivity of the magnetic sensor is generally represented by H (magnetic field strength) = K (sensitivity coefficient) (Vout (voltage output of magnetic sensor) + A (voltage output when no magnetic field is applied). , The coefficient K and the coefficient A vary.

Therefore, in order to calibrate the variation in the sensitivity of the magnetic sensor, the magnetic sensor unit is placed in a chamber for generating a standard magnetic field and calibrated. As a standard field, for example, 0 gauss, 10 gauss, 25 gauss, is generated respectively 50 gauss, and compares the detected magnetic field intensity H ₁ and the standard magnetic field intensity H _s in accordance with the magnetic field sensing direction of the magnetic sensor. Then, a coefficient K and a coefficient A are obtained for each magnetic sensor so that these magnetic field strengths match, and the calibration data is stored in the memory 41 in association with the magnetic sensor.

Based on the calibration data stored in this manner, the actually measured detection output Vout from each magnetic sensor is sequentially replaced with the correct magnetic field strength H, and this data is stored in the memory 41. Thus, an accurate magnetic field intensity distribution of the deflection yoke can be obtained in each of the X direction, the Y direction, and the Z direction regardless of the variation in the sensitivity of each magnetic sensor.

FIG. 10 is an example showing a magnetic field distribution of a magnetic field generated by the deflection yoke detected by the magnetic field measuring device according to the first embodiment of the present invention. Referring to the figure, the horizontal axis represents the arrangement plane Z1 of magnetic sensor S shown in FIG.
To Z12, and the vertical axis indicates the magnetic sensor S as 1 to 200, and indicates the magnetic field strength, that is, the magnetic flux density in each of the X, Y, and Z directions. is there.

As shown in FIG. 6, the number of magnetic sensors S for displaying the magnetic flux density increases from the plane Z1 to the plane Z12 in the drawing, as shown in FIG. This is because the surface area of the substrate increases and the number of magnetic sensors S that can be arranged on the surface increases. In this embodiment, the plane Z12
The number of magnetic sensors S to be arranged is set to 200, and the number of magnetic sensors S as the whole magnetic sensor unit is set to 1000.

FIG. 11 is another example showing the magnetic field distribution of the magnetic field generated by the deflection yoke detected by the magnetic field measuring device according to the first embodiment of the present invention. Referring to the figure, in this example, the horizontal axis represents the plane Z1 to the plane Z12.
And the vertical axis represents the magnetic flux density in the Z direction at the center axis of the deflection yoke. FIG. 12 is still another example showing the magnetic field distribution of the magnetic field generated by the deflection yoke detected by the magnetic field measuring device according to the first embodiment of the present invention.

Referring to the drawing, on each of the planes Z1 to Z12, a plane orthogonal to the direction of the central axis of the deflection yoke is assumed, and the distribution of magnetic flux density on each plane is arranged in a contour line. is there. And typically, the plane Z
Only at n, the magnetic flux density is shown in a contour state, and each plane is three-dimensionally represented as a whole. This makes it possible to visually grasp the distribution of the magnetic flux density of the deflection yoke to be measured.

As yet another example of displaying the detected magnetic flux density, the detected data is compared with the distribution of the standard magnetic field intensity of the deflection yoke to be measured, and the difference is displayed at each measurement position. Conceivable. Then, based on the magnetic field data detected in this way, it is also possible to configure the apparatus to automatically perform a correction for attaching a ferromagnetic material such as a ferrite piece to the measured deflection yoke. That is, the size of the ferrite pieces to be attached according to the degree of difference from the standard magnetic field, the attachment position, etc. are stored in advance as data, and according to the detection data,
Using this data, the selection of the ferrite pieces and the locations where the ferrite pieces are attached may be displayed on the screen. here,
By automating the preparation of ferrite pieces and the pasting work,
It becomes a more convenient device.

In the above embodiment, the substrate constituting the magnetic sensor unit has a circular shape. However, it goes without saying that the shape of the deflection yoke to be measured may be elliptical or rectangular. Further, in the above embodiment, as shown in FIG. 7, the arrangement of the magnetic sensors and the semiconductor relays is specified. However, the arrangement is not limited to this, and the arrangement is not limited to this. May be. Although the upper substrate and the lower substrate each have a three-layer composite substrate structure, a multi-layer composite substrate may be used depending on the degree of integration of circuits and the like.

Furthermore, in the above embodiment, the magnetic sensor unit measures the magnetic field strength in three directions with reference to the axial direction of the deflection yoke. The magnetic field distribution of the deflection yoke to be measured can be similarly grasped three-dimensionally even if a magnetic sensor unit for detecting the magnetic field intensity is prepared.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a magnetic field measuring device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a specific system configuration of the magnetic field measuring device of FIG.

FIG. 3 is a diagram illustrating a magnetic sensor disposed in the magnetic sensor unit 20 of FIG. 2 and a wiring structure connected to the magnetic sensor.

FIG. 4 is a diagram showing the semiconductor relay shown in FIG. 3 and a wiring structure connected to the semiconductor relay;

FIG. 5 is a schematic circuit diagram for describing a process for processing detection outputs of a magnetic sensor of the magnetic sensor unit according to the first embodiment of the present invention in parallel for each block;

FIG. 6 is a side view showing a specific structure of the magnetic sensor unit shown in FIG. 2;

FIG. 7 is an enlarged view of an “X” part in FIG. 6;

FIG. 8 is a view as seen from the line VIII-VIII in FIG. 7;

FIG. 9 is an enlarged sectional structural view taken along line IX-IX of FIG. 8;

FIG. 10 is an example of a display of a magnetic flux density of the deflection yoke detected by the magnetic field measuring device according to the first embodiment of the present invention.

FIG. 11 is another example of the display of the magnetic flux density of the deflection yoke detected by the magnetic field measuring device according to the first embodiment of the present invention.

FIG. 12 is still another example of the display of the magnetic flux density of the deflection yoke detected by the magnetic field measuring device according to the first embodiment of the present invention.

FIG. 13 is a sectional view showing a schematic structure of a general cathode ray tube.

FIG. 14 is an exploded perspective view of the deflection yoke shown in FIG.

[Explanation of symbols]

 19 magnetic field measuring device 20 magnetic sensor unit 22 display 23 deflection yoke 31 CPU 32 sensor drive switching circuit 33 sensor output capture circuit 34 -Sensor output switching circuit 36 ... horizontal deflection coil 37 ... horizontal deflection coil drive circuit 38 ... vertical deflection coil 39 ... vertical deflection coil drive circuit 41 ... memory 43 ... decoder 44 ... · Row decoder 46 ··· Column decoder 61 · · · cathode ray tube Note that the same reference numerals in each figure indicate the same or corresponding parts.

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[Procedure amendment]

[Submission date] March 9, 2000 (200.3.9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

According to the first aspect of the present invention,
A magnetic sensor unit for measuring a magnetic field generated by a deflection yoke attached to a cathode ray tube or the like, wherein a plurality of flat plates are arranged at a predetermined interval from each other and each surface is arranged in a direction perpendicular to one axis. A plurality of substrates, each of which has an outer peripheral edge along the inner wall surface of the deflection yoke to be measured, and a magnetic flux of a magnetic field at the positions where the plurality of substrates are arranged over the entire area of the substrate. And a plurality of magnetic sensors for detecting the density.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

With the above configuration, the magnetic sensor for detecting the magnetic flux density in each of the X, Y, and Z directions is one.
Since the number of magnetic sensors that detect the magnetic flux density in one direction can be increased as compared with those arranged in one unit, the detection accuracy of the magnetic sensors is improved. The magnetic field measuring device according to claim 5, which is a magnetic field measuring device for measuring a generated magnetic field of a deflection yoke attached to a cathode ray tube or the like, has a three-dimensional shape that can be inserted into an inner wall surface of the deflection yoke to be measured.
A magnetic sensor unit including a plurality of magnetic sensors to be disposed in a magnetic field space generated by the deflection yoke, a deflection coil driving unit for driving at least one of a horizontal deflection coil and a vertical deflection coil of the deflection yoke to be measured, With the sensor unit inserted into the deflection yoke to be measured, the number of magnetic sensors is divided into a plurality of blocks of substantially the same number, and magnetic sensor driving means for sequentially driving the magnetic sensors included in each block in parallel for each block, A sensor output capturing unit that sequentially captures sensor outputs detected from each of the driven magnetic sensors in parallel for each block; a calculating unit that calculates a magnetic flux density for each magnetic sensor based on the captured sensor output; Based on each position of the sensor, each magnetic flux density calculated as the magnetic field distribution of the deflection yoke is calculated. It is obtained by a Shimesuru display means.

Claims (7)

[Claims] 1. A magnetic sensor unit for measuring a magnetic field generated by a deflection yoke attached to a cathode ray tube or the like, wherein the flat plate shape is arranged at a predetermined interval in a central axis direction and each is arranged in a direction perpendicular to the central axis direction. And a plurality of substrates corresponding to the three-dimensional shape formed by the inner wall surface of the deflection yoke to be measured, and the three-dimensional shape formed by connecting the outer peripheral edges of the adjacent ones is arranged in the entire range of each of the substrates. And a plurality of magnetic sensors for detecting the magnetic flux density of the magnetic field at the arranged position. 2. The magnetic sensor comprises a Hall element,
2. The magnetic sensor unit according to claim 1, wherein the Hall elements are arranged in a matrix of rows and columns on each surface of the substrate. 3. A plurality of row address lines, each provided corresponding to a row of the Hall elements, connected to a first voltage application terminal of a Hall element in the corresponding row; A plurality of column address lines provided in a direction intersecting with each other and corresponding to the row of the hall elements and connected to the second voltage application terminals of the hall terminals of the corresponding row; And selecting one of the row address lines and one of the column address lines and selecting a magnetic sensor to be in a conductive state in which a voltage can be applied to a Hall element connected to the selected row address line and column address line. Means, each comprising a pair of output lines provided corresponding to the row or column of the Hall element, each of the output line pairs having a first current sensing terminal of the Hall element of the corresponding row or column, and Second
A plurality of output line pairs connected to each of the current sensing terminals of the Hall element, each between a first current sensing terminal of the Hall element and one of the output line pairs connected thereto, and a second one of the Hall element. A plurality of switching means pairs mounted between a current sensing terminal and the other of the output line pairs connected thereto; and in response to a second input signal, turned on by the selecting means of the switching means pairs. 3. The magnetic sensor unit according to claim 2, further comprising: output selection means for setting only a switching pair connected to the selected Hall element to a conductive state. 4. The magnetic sensor according to claim 1, wherein all of the magnetic sensors have a Z direction that is an axial direction of the deflection yoke to be measured, an X direction that is orthogonal to the Z direction, and a Y direction that is orthogonal to the Z direction and the X direction.
The magnetic sensor unit according to claim 1, wherein the magnetic sensor unit is arranged to detect a magnetic flux density in any one of the directions. 5. A magnetic field measuring device for measuring a magnetic field generated by a deflection yoke attached to a cathode ray tube or the like, having a three-dimensional shape that can be inserted into an inner wall surface of the deflection yoke to be measured. A magnetic sensor unit including a plurality of magnetic sensors arranged at positions corresponding to substantially the entire magnetic field space to be measured; deflection coil driving means for driving at least one of a horizontal deflection coil and a vertical deflection coil of a deflection yoke to be measured; A magnetic sensor that divides the magnetic sensor unit into a plurality of blocks having substantially the same number in a state where the magnetic sensor unit is inserted into a deflection yoke to be measured, and sequentially drives the magnetic sensors included in each block in parallel for each block; Driving means, and sequentially taking in parallel the sensor output detected from each of the driven magnetic sensors for each block Sensor output capturing means; calculating means for calculating a magnetic flux density for each magnetic sensor based on the captured sensor output; and A magnetic field measuring device, comprising: display means for displaying the measured magnetic flux density. 6. A standard magnetic field generating means for generating a desired standard magnetic field, and the magnetic sensor unit is installed in the standard magnetic field generating means, and a magnetic flux density detected and calculated by each magnetic sensor is a magnetic flux density of the standard magnetic field. Calibration data storage means for storing calibration data for each magnetic sensor, and controlling the calculation means to calculate a magnetic flux density based on an output of each magnetic sensor based on the stored calibration data. The magnetic field measurement device according to claim 5, further comprising a control unit. 7. Three types of magnetic sensor units are prepared, and each type of magnetic sensor unit has a Z direction which is an axial direction of a deflection yoke to be measured, an X direction orthogonal to the Z direction, and the Z direction. And Y orthogonal to the X direction
Each of the magnetic sensors is arranged so as to detect a magnetic flux density in each of the directions, and the calculating means calculates the magnetic field based on a sensor output taken from each of the magnetic sensors arranged in each of the magnetic sensor units. 7. The magnetic field measuring device according to claim 6, wherein a magnetic flux density in a desired direction at a position of the sensor is calculated.