JPS6040658B2 - Single coil inspection method for deflection yoke - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single coil inspection method for measuring the magnetic field distribution of a single coil, which is a main part of a TV deflection yoke.

Like the coil in the deflection yoke, the impedance is low;
Variations in the shape, winding occupancy, and wire distribution greatly affect the characteristics of the deflection yoke, so conventional dielectric strength tests and inductance measurements alone cannot adequately evaluate the coil itself. could not be done.

For this reason, the final inspection of the completed deflection yoke is the comparator.
There were drawbacks such as a considerable amount of time being required for inspection and poor yield. Therefore, a method of inspecting a single coil by moving one magnetic field measuring sensor to each measurement point of a single coil and measuring the magnetic field to determine the magnetic field distribution of the single coil was developed as a practical matter.

However, in this inspection method, one magnetic field measurement sensor is moved to each measurement of a single coil to measure the magnetic field, so it takes a considerable amount of time to measure the magnetic field distribution of a single coil. It is time-consuming, and therefore it is impossible to inspect the quality of individual coils in large quantities during the manufacturing process, so they have been mainly used in laboratories and the like. The present invention
In view of the above points, it is an object of the present invention to provide an inspection method that can measure the magnetic field distribution in the magnetic field effective part of a single coil in a short time.

The present inventor has discovered that by measuring the magnetic field distribution of a coil as a single coil, it is possible to detect the shape, winding space factor, and variation in winding distribution without being influenced by other parts. Focusing on the fact that the required magnetic property is symmetry with respect to the central axis of the coil, we installed the coil in a coil mounting jig with several magnetic field measurement sensors arranged in several layers in a cross section perpendicular to the central axis of the coil. invented the ability to measure the magnetic field distribution of a single coil in a short time by passing a current through the coil to generate a magnetic field and measuring it. Hereinafter, a specific example of the method for inspecting a single coil of a deflection yoke according to the present invention will be described with reference to the accompanying drawings. The horizontal coil of the deflection yoke is a coil-shaped coil, as shown in FIGS. 1 to 3.
It is made by combining two 1'. And the coils 1, 1
The conditions for measuring the magnetic field distribution of coils 1 and 1' are as follows: Points, for example, A,, A2, N, A4 are taken as the magnetic field measurement points on the A cross section, and the following mechanically determined points up to and including D,, ○2, D3, and D4 are determined vertically and horizontally symmetrically, and each of the above magnetic field measurement points is A,
, Hmm......Measure the magnetic field at D3 and D4. FIG. 4 is a perspective view of an inspection device used in the inspection method of the present invention.

This inspection device has a pair of brackets 7, 7 on a base 2.
' is fixed, an acrylic coil mounting fixture 3 is provided between the pair of brackets 7, 7', and a pair of slides 8, 8' are slidably mounted on both ends of the base 2. , attach the coil pressers 4, 4' to the slides 8, 8' and the handle 5,
5'.

A magnetic field measuring sensor (not shown) is placed at a position corresponding to the magnetic field measuring points A, A2, D3, D4 of the coil 1' of the coil mounting jig 3. Connect the lead wire 10 of the magnetic field measurement sensor to the terminal block 9. In the figure,
Reference numerals 6 and 6' indicate stop pins protruding from the slides 8 and 8'.

Next, a coil unit inspection method of the present invention using the above-mentioned apparatus will be explained.

That is, the coils 1 and 1' are placed on both sides of the coil mounting pick 3 and held down by the coil pressers 4 and 4'.

Next, a predetermined current is passed through the coils 1, 1' to generate an alternating magnetic field. Then, each magnetic field measurement point A of the coils 1 and 1' is detected by the magnetic field measurement sensor placed on the coil mounting jig 3.
, , A2......D3, D4 are measured, and based on the measured values, a magnetic field measurement distribution diagram as shown in FIG. 5 is obtained. In the magnetic field distribution diagram shown in Figure 5, the measured distribution shown by the solid line represents an ideal coil, and the measured distribution shown by the broken line represents the actual measured value. The forehead appears unbalanced.

In this way, in the present invention, a coil is set in a coil mounting jig in which several magnetic field measurement sensors are arranged in several layers in a cross section perpendicular to the central axis of the coil, and a current is passed through the coil to generate a magnetic field. Since the magnetic field is generated and the resulting magnetic field is measured, the magnetic field distribution in the magnetic field effective part of the coil can be measured in a short time.

Moreover, since quality inspection can be performed on the coil itself,
This has the advantage of being able to control the quality of the coil during the manufacturing process and improve the quality of the coil.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the coil, Figs. 2 and 3 are a plan view and side view showing an example of the magnetic field distribution measurement points of the coil, and Fig. 4 is a perspective view of the device used in the single coil inspection method of the present invention. FIG. 5 is a magnetic field distribution diagram between the ideal value and the Misato value. 1, 1'... Coil, 3... Coil installation jig,
4, 4'... Coil holder, A,, A...
...D3, D4...Magnetic field measurement points. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 Coil installation in which multiple magnetic field measurement sensors are arranged in several layers in a cross section perpendicular to the central axis of a single coil, symmetrical to a horizontal line and a vertical line that intersect at the center of the cross section, and in positions close to the coil. Set the coil alone on the jig,
A predetermined current is passed through the single coil to generate an alternating magnetic field, and the magnetic field measurement sensor measures the magnetic field at each magnetic field measurement point of the single coil to obtain the magnetic distribution of the single coil. Single coil inspection method for deflection yoke.