JPS5815895B2 - Single coil inspection device for deflection yoke - Google Patents

Description

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

For items such as a single deflection yoke coil, which has low impedance and whose shape, winding space factor, and wire distribution variations greatly affect the characteristics of the deflection yoke, conventional dielectric strength tests and inductance measurements alone cannot measure the coil alone. It was not possible to perform appropriate evaluation and quality control.

For this reason, the convergence inspection, which is the final inspection of the completed deflection yoke, takes a considerable amount of time, resulting in disadvantages such as poor yield.

Therefore, an inspection device was experimentally developed in which one magnetic field measurement sensor is moved to each measurement point of a single coil to measure the magnetic field and determine the magnetic field distribution of the single coil.

However, since this inspection device measures the magnetic field by moving one magnetic field measurement sensor to each measurement point of a single coil, it takes a considerable amount of time to measure the magnetic field distribution of a single coil. Therefore, it is impossible to inspect the quality of a large number of individual coils during the manufacturing process, and it has been mainly used in laboratories.

In view of the above points, the present invention aims to provide an inspection device that can measure the magnetic field distribution in the magnetic field effective portion of a single coil in a short time. It consists of a member and a magnetic field measuring jig which has a shape inscribed within a single coil with a slight gap and has a plurality of magnetic field measuring sensors arranged in several layers in a cross section perpendicular to the central axis of the single coil,
The present invention is characterized in that a magnetic field measuring jig is set in a magnetic field effective portion of a single coil that is positioned and fixed by a positioning member to measure the magnetic field distribution of the single coil.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the deflection yoke coil unit inspection apparatus according to the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the vertical coil of the deflection yoke is constituted by two coils 1, 1' held together by a combination stopper 4° 4'.

In addition, 2.2' in the figure. 3 and 3' are lead wires, and 5 and 5' are dividing surfaces.

The conditions for measuring the magnetic field distribution of the coils 1 and 1' are that the coils 1 and 1 have several layers of cross sections (A cross section, B cross section, C cross section, and D cross section) perpendicular to the central axis of the coils 1 and 1'.
A point along the shape of 1', for example A.

A2... A, 2 are the magnetic field measurement points on the A cross section, and the following are mechanically determined to be vertically and horizontally symmetrical up to Dl, D2... Dl2, and each of the above magnetic field measurement points The magnetic field is measured at

'Thus, the inspection device of the present invention comprises a main body 7 installed on a base 6, a positioning member for positioning and fixing the coils 1 and 1', and a magnetic field measuring jig 8.

The positioning member includes a fixing member 18 fixed on the base 6, a clamp cam 16 screwed onto the outer periphery of the fixing member 18 so as to be movable up and down, and a substantially V-shaped stopper fixed on the fixing member 18. Positioning claws 14, 14 are provided at the stoppers 15 and 15' at both ends of the stopper member.
By operating the bundle 17 protruding from the clamp cam 16, the clamp cam 16 rotates and moves up and down, and the stoppers 15, 15' and the positioning pawl 1 are fixed.
4°14' is configured to open and close.

The magnetic field measuring jig 8 has a hollow truncated conical shape that is inscribed within the coils 1 and 1' with a slight gap.
Magnetic field measuring sensors 24, 25, 26 are located at locations corresponding to the magnetic field measuring points AI, A2, . . ., Dl2.

Place 27.

That is, the magnetic field measurement sensors 24, 25, 26, 27
An electric wire 32 is wound around a part of a cylindrical bobbin 31 made of non-magnetic synthetic resin to form a coil, a spacer 33 is fixed to one end of the bobbin 31, and a lead wire 28 is inserted from the notch 34 of the spacer 33. The magnetic field measurement sensor 24, 25, 26, 27 is inserted into the embedding hole 36 of the magnetic field measurement jig 8, and a non-magnetic clay-like object 3 is inserted.
5 into the embedded hole 36 and the sensors 24, 25, 2
6.27 is fixed, and its lead wire 28 is connected to the terminal box 20 through the wire hole 30 and the hollow hole 29.

The magnetic field measuring jig 8 thus formed is fixed to the lower end of the vertical shaft 10 via the plate 9, and the vertical shaft 10 can be attached to the main body T in any vertical direction using the hole 11 of the vertical shaft 10 and the positioning pin 12, Coils 1, 1 are attached to the plate 9.
Push pins 13, 13' are provided to press down the upper edge of the plate.

In the figure, 22 is a control unit connected to the terminal box 20 by a cable 21, and displays the measured magnetic field strength.

Reference numeral 23 denotes a power source that causes a predetermined current to flow through the coils 1 and 1'.

The inspection device of the present invention has the above configuration and measures the magnetic field distribution of a single coil as described below.

That is, the coils 1 and 1' are positioned and clamped by the positioning claws 14 and 14' of the positioning member and the stoppers 15 and 15'.

Next, the magnetic field measuring jig 8 is set in the magnetic field effective part of the coil 1.1', and the magnetic field measuring sensor 2 of the magnetic field measuring jig 8 is set.
4,25°26.27 for each measuring point A1. A2...
I) Measure the magnetic field at tt l DI□, and obtain a magnetic field measurement distribution diagram as shown in FIG. 9 based on the measurement results.

In the magnetic field distribution diagram shown in FIG. 9, the ideal coil is vertically and horizontally symmetrical.

In this way, the present invention uses a magnetic field measuring jig in which a plurality of magnetic field measuring sensors are arranged in several layers in a cross section perpendicular to the central axis of the coil, so that the magnetic field distribution in the effective magnetic field part of the coil can be shortened. Can be measured in time.

Furthermore, since the quality of the coil can be inspected on its own, it is possible to control the quality of the coil during the manufacturing process, and it is possible to 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 showing an embodiment of the inspection device of the present invention. Figure 5 is a partial sectional view showing the measurement state, Figure 6 is a partial sectional view of the magnetic field measurement jig, Figures 7a and b are side and front views of the magnetic field measurement sensor, and Figure 8 is the magnetic field measurement sensor. FIG. 9, which is a partially enlarged sectional view of the measuring jig, is a magnetic field distribution diagram. 1.1'... Coil, 8... Magnetic field measurement jig, 14°14'... Positioning claw, 15, 1
5'... Stopper; 16... Clamp cam, 18... Fixed member, 24° 25, 26
, 27... Magnetic field measurement sensor, A1. A2...
Dll, D1□...Magnetic field measurement point.

Claims (1)

[Claims] 1 A positioning member for positioning and fixing a single coil of a deflection yoke, and a hollow truncated conical magnetic field measuring jig inscribed within the single coil with a slight gap, the positioning member being made of a non-magnetic material. On the other hand, the magnetic field measuring jig has a plurality of magnetic field measuring sensors arranged in several layers in a cross section perpendicular to the central axis of the single coil, and is arranged in the magnetic field effective part of the single coil positioned by the positioning member. A single coil inspection device for a deflection yoke configured to set the magnetic field measurement jig and measure the magnetic field distribution of a single coil.