JPS6116449A - Method of adjusting convergence in deflecting coil - Google Patents

Abstract

PURPOSE:To achieve the automatization due to robots etc. by manufacturing a core and a separator in a free fitting state, and subtly displacing the positional relationship between both to adjust in response to the outputs of magnetic sensors, and thereafter fixing both by means of adhesive. CONSTITUTION:Four magnetic sensors A, B, C and D are assembled within a sensor portion 5, and asymmetry in the upper and lower sides is detected from the relationship between the sensors A, B and C, D, and asymmetry in the right and left sides is detected from the relationship between the sensors A, C and B, D. A core 12 is supported by a chuck 8. Given current for testing is passed through a horizontal and a vertical deflecting coils 13, 14. The outputs of the magnetic sensors in response to the current to be passed are inputted into a control portion 6, and the chuck portion 8 is operated so as to obtain symmetry in relation to a direction of X axis, a direction of Y axis and theta direction. When the best state is obtained, for example, adhesive 15 such as hot melt is injected from a nozzle, and the core 12 and a separator 16 are adhered.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for adjusting convergence of a deflection coil.

<Prior Art> Conventionally, the convergence adjustment of a deflection coil has been carried out by mounting it on a cathode ray tube, visually determining the amount of screen shift, and correcting it using a magnetic piece such as ferrite.

However, the adjustment work using this method of attaching magnetic pieces is a local adjustment of the magnetic field distribution, and in order to obtain good characteristics, it is necessary to attach magnetic pieces in at least several places. It requires skill to accurately find the size of the dot and the magnetic piece, and furthermore, there is a drawback that adjustment work requires a lot of time.

<Object of the Invention> The object of the present invention is to provide a deflection coil convergence adjustment that can fundamentally adjust the asymmetry of the deflection coil magnetic field, rather than local adjustment of the magnetic field distribution, and that can be automatically adjusted using a simple robot. There is a whole way to offer you.

In other words, by measuring the magnetic field distribution inside the coil with a Gaussian sensor, and considering that there is a certain correlation between the magnetic field distribution and the screen deviation, we set the core and separator in a loosely fitted state and calculate It moves a robot, etc. and automatically adjusts the amount of screen deviation within specifications.

<Example> An embodiment of the present invention will be described in detail below with reference to the drawings.

Figure 3 is a schematic diagram of the automation system equipment, including work supply and
It consists of the following parts: extraction A, pressure test B, and hot melt C1 adjustment.

Figure 4 shows details of the adjustment section.

An unadjusted deflection coil G is placed on a pallet 2 conveyed by a base conveyor 1. A magnetic field measuring device 3 is provided at a predetermined position below the parent 2, a sensor section 5 is vertically displaced by a motor 4, and each output of the sensor is input to a control section 6.

Directly above the sensor section 5 is the chuck section 8 of the robot 7.
The chuck portion 8 can be displaced by an X-axis direction drive motor 9, a Y-axis direction drive motor 10, and a θ-direction drive motor 11.

A memo IJK in the control unit 6 stores a predetermined program.

When the deflection coil G to be adjusted is conveyed by the base conveyor 1 and stops right above the sensor section 5, the sensor section 5 rises and fits inside the deflection coil G, and at the same time, the chuck section 8 of the robot 7 is moved. Grasp the core of the deflection coil G.

FIG. 1 shows a longitudinal sectional view at that time, and FIG. 2 shows a plan view.

Four magnetic sensors A, B, C, and D are built into the sensor unit 5, and vertical asymmetry is detected from the relationship between A, B, C, and D, and the relationship between A, C, and B, and D is detected. Left-right asymmetry is detected. The core 12 is held by a chuck 8. A predetermined test current is applied to the horizontal and vertical deflection coils 13,14. The output of the magnetic sensor according to the applied current is input to the control section 6, and the chuck section 8 is operated so as to be symmetrical about the X-axis direction, the Y-axis direction, and the θ direction.

When the best condition is obtained, an adhesive 15 such as hot melt is injected from the nozzle to bond the core 12 and separator 1.
6.

That is, the horizontal deflection coil 13 is fixed to the inside of the plastic separator 16, and the vertical deflection coil 14, which was originally wound around the core 12, is loosely fitted to the outside of the separator 16. After making the following adjustments, both are fixed.

Note that the adhesive 15 may be applied in advance before adjustment and rapidly solidified by blowing cold air after adjustment. Further, the number of sensors is not limited to four, and an appropriate number can be used as necessary.

<Effects of the Invention> According to the invention, a magnetic sensor is assembled in place of a standard cathode ray tube, and a properly sized sensor part is inserted into a deflection coil.
This is because the core and separator are manufactured in a loose fit state in advance, and the positional relationship between the two is adjusted by slight displacement according to the output of the magnetic sensor, and after adjustment, the two are fixed with adhesive. , automation using robots, etc. becomes possible,
Production capacity has been dramatically improved I1, and the deflection coil has perfect symmetry, improving the display quality of color images.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the main part during adjustment showing an embodiment of the invention, Fig. 2 is a plan view of the same, Fig. 3 is a schematic diagram of the automation system equipment, and Fig. 4 is the main part of Fig. 3. Details: ``This is a detailed diagram.'' A 5...Sensor part, 6...Control part, 7...Robot, butt...Chuck part, 12...Core,
13...Horizontal deflection coil, 14...Vertical deflection coil, 15...Adhesive, 16...Separator.

Claims (1)

[Claims] 1. Insert the sensor part with the built-in magnetic sensor into the deflection coil, and adjust the positional relationship between the core and separator, which have been loosely fitted in advance, to a certain correlation between the magnetic field distribution in the coil and the screen shift. A method for adjusting the convergence of a deflection coil, the method comprising adjusting the convergence by making a minute displacement based on the above-mentioned characteristics, and then fixing the two together with an adhesive after adjustment.