JPH09190941A - Variable inductor inspection device - Google Patents

Abstract

(57) Abstract: It is an object of the present invention to provide a variable inductor inspection device used in various electronic devices, which is capable of high-speed and accurate measurement. SOLUTION: A pulse motor 7 having a driver 9 for rotationally driving a core 22 of a variable inductor 1, a pulse motor driver 6, a pulse motor control unit 5, and measuring and controlling the inductance to control and drive the pulse motor control unit 5. The measurement circuit 2, the measurement unit 3, the operation determination unit 4 that sends a command or a value based on the measurement data, the position depth measurement unit of the core 22, and the determination unit 15 that performs the calculation and comparison determination.
With the configuration consisting of, it becomes possible to perform high-speed and highly accurate measurement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection of a variable inductor which can be used for electronic equipment and can automatically, rapidly and highly accurately measure the variable inductance range of a variable inductor having a variable inductance value. It relates to the device.

[0002]

2. Description of the Related Art A variable inductor includes a bobbin 21 made of an insulating resin material, a core 22 provided with a core driving recess 25 made of a magnetic material such as a ferrite core, and a coil, as shown in a sectional view of FIG. A coil wire 23 made of a copper wire material or the like, a shield case 24 made of a metal material, and a lead terminal 26 of an electrical and mechanical connection portion to the outside. Is wound, and the inductance value can be varied by moving the magnetic core 22 in the magnetic field created by the winding 23.

The variable inductor 1 needs to guarantee a variable range of the inductance as one of the electrical characteristics of the product, and since this characteristic is the most basic characteristic,
Usually, 100% inspection is performed.

A conventional variable inductor inspection device will be described below with reference to the drawings. FIG. 1 shows the configuration of a variable inductor inspection device. In FIG.
Reference numeral 1 is the variable inductor described above, 2 is an inductance measuring circuit having a probe 10 in contact with the tip of the lead terminal 26 of the variable inductor 1, and 3 is a measuring circuit for inputting a signal for measurement to the measuring circuit 2. The measurement unit 4 which obtains the inductance value by measuring and calculating the output from 2 reads the measurement data from this measurement unit 3,
Inspection controller 5 for sending commands to the judgment and pulse motor 7,
Is a pulse motor control unit that outputs a pulse corresponding to the control signal of the inspection control unit 4, 6 is a pulse motor driver that rotates the pulse motor 7 with the pulse output of the pulse motor control unit 5, and 7 is a core driving recess 25. And a pulse motor 8 for rotating a driver 9 for rotating the magnetic core 22. The driver 9 mounted on the pulse motor 7 is moved back and forth to move the magnetic core 22 of the variable inductor 1 to the magnetic core 22. A motor holding portion that engages and disengages with the driver 9, and a driver 9 that engages with a core driving recess 25 provided in the magnetic core 22 of the variable inductor 1 to rotate the magnetic core 22. Is.

Now, the driver 9 is attached to the core 22 of this magnetic material.
And the position of the magnetic core 22 is changed by rotating the driver 9 with the pulse motor 7, the inductance value changes as shown in the characteristic curve diagram of FIG. 3 depending on the position of the magnetic core 22. However, when the magnetic core 22 is at the deepest position, the inductance value becomes the smallest,
When the magnetic core 22 is at the shallowest position, the inductance value is the largest.

In the inspection of the variable inductance range, the maximum value and the minimum value of the inductance value when the position of the magnetic core 22 is changed are measured by the measuring circuit 2 and the measuring section 3, and the difference is measured. It is a variable range.

[0007]

However, in such a conventional inductor inspection device, in order to measure the variable inductance range, the measurement is performed at the necessary positions in the entire range in which the core of the magnetic material can move and change. Since it has to be performed, there is a problem that the inspection time is long.

The present invention is intended to solve such a problem, and by changing only a part of the position of the core of the magnetic body of the variable inductor and measuring and calculating the inductance and the moving distance, the inductance in the entire range can be obtained. It is an object of the present invention to provide a variable inductor inspection device for measuring the variable inductance range of a variable inductor, which is capable of measuring and inspecting at high speed and with high accuracy by adopting a method capable of measuring the variation width of the variable inductor.

[0009]

In order to solve the above-mentioned problems, the present invention provides a motor having a driver for rotating a magnetic core of a variable inductor, and an inductance value by rotating the magnetic core by this motor. Measuring unit for measuring and calculating the median value of the variable range, a second measuring unit for measuring the moving amount of the core, and a change in the inductance obtained by the first measuring unit. The determination unit is configured to compare and determine the inductance value obtained based on the rate and the core movement amount obtained by the second measuring unit.

According to the present invention, it is possible to measure and inspect the variable inductance range of the variable inductor at high speed and with high accuracy.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
A motor equipped with a driver for rotating the core of the variable inductor, and the variable inductor is held in an electrically connected state, and the core of the variable inductor is rotated by the motor to measure the inductance value and the center value of the variable range. A first measuring unit for obtaining the value, a second measuring unit for measuring the amount of movement of the core of the variable inductor showing the variable range median value, and a calculation from the variable range median value calculated by the first measuring unit. A determination unit that determines an inductance value based on the obtained change rate of the inductance and the amount of movement of the core measured by the second measurement unit, and compares the obtained inductance value with a predetermined inductance value. This has the effect that the entire variable range can be measured and calculated by driving and measuring approximately half of the variable range.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of the inductor inspection apparatus described in the conventional example, FIG. 2 is a cross-sectional view of the variable inductor described above, and FIG. 4 is a main part of a magnetic core depth measuring unit. It is a block diagram. In FIG. 1, 1 is the variable inductor described above, 2 is an inductance measuring circuit having a probe 10 in contact with the tip of the lead terminal 26 of the variable inductor, and 3 is a signal for measurement input to the measuring circuit 2. Then, the measuring unit 4 which obtains the inductance value by measuring and calculating the output from the measuring circuit 2 reads the measured data from the measuring unit 3 and calculates and makes the judgment and commands and values to the pulse motor 7 and the judging unit 15. , A pulse motor control unit for outputting a pulse corresponding to a control signal of the inspection control unit 4, a pulse motor driver 6 for rotating the pulse motor 7 by the pulse output of the pulse motor control unit 5, Reference numeral 7 denotes a pulse motor which is inserted into the core driving recess 25 and rotates a driver 9 for rotating the magnetic core 22.
Is a motor holding portion for engaging and disconnecting the magnetic core 22 of the variable inductor 1 and the driver 9 by moving the driver 9 attached to the pulse motor 7 back and forth, and 9 is the variable inductor 1 A driver for rotating the magnetic core 22 by engaging with the core driving recess 25 provided in the magnetic core 22.
Reference numeral 5 is a determination unit that performs calculation and comparison determination.

In the above structure, as shown by the characteristic curve in FIG. 3, the initial position of the magnetic core 22 is hA, and the inductance value at this time is LA. Although the magnetic core 22 is rotated from this position, the change in the inductance in the vicinity of the initial position hA is not linear. Therefore, the position LL that linearly changes is set in advance, first, the position is rotated to that position, and the position of the core 22 of the magnetic body at this time is set to hL.

Next, the inductance value near the center of the variable range is set to L0, the core 22 of the magnetic body is rotated to this inductance value, and the position of the core 22 of the magnetic body at this time is set to h0.

The further L is away from LL, the higher the calculation accuracy becomes, but the measurement time becomes longer. Therefore, an optimum value is set from the calculation accuracy, the measurement time and the variable inductor to be measured.

LL, hL, L set or obtained as described above
From 0 and h0, the rate of change k of the inductance value can be expressed by the following (Equation 1).

[0017]

[Equation 1]

Since the maximum variable position hH of the magnetic core 22 is defined by the product, the inductance value LH at the maximum variable position is calculated from the rate of change k calculated by (Equation 1) and hH, h0, L0. Can be obtained by calculation using the following (Equation 2).

[0019]

[Equation 2]

The operation of the variable inductor inspecting method and apparatus for measuring the variable inductance range of the variable inductor, which is constructed as described above and can be calculated and operated, will be described below.

First, the variable inductor 1 to be inspected is put in and set. The probe 10 of the measuring circuit 2 is brought into contact with the tip of the lead terminal 26, and the motor holding portion 8 is advanced to the side of the variable inductor 1 so that the driver 9 is inserted into the core driving recess 25 of the magnetic core 22 of the variable inductor 1. Insert the tip of.

When the driver 9 is engaged with the magnetic core 22 of the variable inductor 1, the inspection control unit 4 issues a measurement start command to the measurement unit 3 to start measuring the inductance value, and at the same time, the pulse motor 7 is turned on. Rotate. The inspection control unit 4 reads the measured value from the measuring unit 3, stops the pulse motor 7 when the measured value reaches the minimum value of the regulated inductance variable range, and reads the inductance value (LL) at that time. After that, the measured value is read while rotating the pulse motor 7 again, and when the specified inductance variable range central value is reached, the pulse motor 7 is stopped, and the inductance value (L0) at that time and the pulse motor rotation angle (Δθ) are determined. Read it. The amount of movement of the magnetic core 22 from LL to L0, that is, the distance (Δh) is
It can be calculated from the pitch (p) of the screw cut on the magnetic core 22 and the pulse motor rotation angle (Δθ) by the following (Equation 3).
The change rate (k) of the inductance with respect to the movement amount of 2 is calculated and obtained by the mathematical formula of (Equation 4), and the value is determined by the determination unit 15
Send to

[0023]

(Equation 3)

[0024]

(Equation 4)

When the above two values are obtained, the driver 9 is separated from the variable inductor 1 by the measuring unit 3, the measuring circuit 2 and the motor holding unit 8 to move the variable inductor 1 to the next magnetic material shown in the block diagram of FIG. It is sent to the depth measuring section of the core 22. Here, the depth detection unit 12 of the magnetic core 22 is advanced to bring the detection tip 11 into contact with the core 22 of the variable inductor 1, and the depth (h
0) is measured.

The depth measuring section of the magnetic core 22 includes a variable inductor 1 and a depth detecting section 1 of the magnetic core 22.
2. A position from the top surface of the shield case 24 of the variable inductor 1 shown in FIG. 2 to the upper surface of the magnetic core 22, that is, the magnetic core 22.
Depth h0 is detected and measured.

From the measured depth (h0) of the core 22 of the magnetic material, the above-mentioned inductance change rate (k), and the specified maximum variable position, the inductance value (LH) at that time is calculated (Equation 2). Is calculated by the determination unit 15 according to
If the determination unit 15 determines that H is within the specified range, this variable inductor has a specified variable width of the inductance value within the movable range of the magnetic core 22 and is determined to be a good product. Can be done.

The magnetic core 22 may be replaced by a non-magnetic metal core having a negative rate of change k, and the depth was measured by a mechanical method. The present invention can be applied not only to variable inductors but also to electronic components and electronic devices whose characteristics change linearly, such as variable resistors and variable capacitors.

[0029]

As described above, according to the present invention, it is not necessary to measure the inductance value when the core of the magnetic body of the variable inductor is rotated, and it is necessary to measure about half the range. Since the measurement of the minute can be guaranteed, the variable range can be measured and inspected at high speed and with high accuracy, which can greatly contribute to the improvement of the productivity of the variable inductor.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a variable inductor inspection device.

FIG. 2 is a sectional view showing a structure of a variable inductor.

[Fig. 3] Movement (depth) of the magnetic core of the variable inductor
Characteristic diagram showing the relationship between the inductance value and the inductance value

FIG. 4 is a conceptual diagram showing a configuration of a core depth measuring unit of a magnetic body according to an embodiment of the present invention.

[Explanation of symbols]

 1 Variable Inductor 2 Measuring Circuit 3 Measuring Section 4 Inspection Control Section 5 Pulse Motor Control Section 6 Pulse Motor Driver 7 Pulse Motor 8 Motor Holding Section 9 Driver 10 Meter Reading 11 Detecting Tip 12 Depth Detection Section 13 Measuring Section 14 Inspection Control Section 21 Bobbin 22 Core 23 Winding 24 Shield case 25 Core driving recess 26 Lead terminal

Claims (1)

[Claims] 1. A motor provided with a driver for rotating a core of a variable inductor, and a variable inductor is held in an electrically connected state, and the core of the variable inductor is rotated by the motor to measure an inductance value. And a second measuring section for measuring the amount of movement of the core of the variable inductor showing the median value of the variable range, and the variable range calculated by the first measuring section. The inductance value is calculated based on the rate of change of the inductance calculated from the median value and the amount of movement of the core measured by the second measuring unit, and the obtained inductance value is compared with a predetermined inductance value for determination. Inspection device for variable inductor consisting of judgment unit.