JPS6120987B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for automatically aligning the knobs of a magnet for adjusting the purity and convergence attached to the neck of a color cathode ray tube.

FIGS. 1 and 2 show the mounting positions of six magnet rings attached to the neck portion of a color cathode ray tube and the shapes of the magnet rings. FIG. 3 shows a conventional magnet adjustment mechanism comprising a geared idler 6 that rotationally drives a magnet ring and a pinion 11 (connected to a motor shaft 12) that rotates the idler 6. Prior to the actual operation, the operation of meshing the six magnet rings 3 with the gears of the idler 6 involves reciprocating the idler 6 by a minute amount in the circumferential direction 7 as shown in FIG. This is performed by asymptotically moving the magnetic ring in the direction 8 of engagement with the magnetic ring around the center of movement 10. Due to this reciprocating movement, when the idler 6 has finished engaging with the magnetic ring, the initially set horizontal position of the knob is disturbed, as shown in FIG. Since this disturbance increases the time required for static convergence adjustment, it is necessary to align each knob prior to the adjustment operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnet ring knob alignment mechanism that eliminates the above-described drawbacks of the conventional device and enables shortening of image adjustment time.

A schematic diagram of a magnetic ring alignment mechanism according to the present invention is shown in FIG. In order to automatically correct the knob position disturbed by the automatic engagement operation of the idler 6, the idler 6 is first rotated to bring the knob 4 into contact with the knob detection lever 13. The detection lever rotates around a fulcrum 19, and the other end operates the detection micro switch 14. The idler 6 is stopped by the signal from the micro switch 14,
Next, the idler 6 is rotated in the opposite direction. The amount of rotation of the idler at this time is a predetermined constant amount 17, and the knob returns to the horizontal position and stops. By performing this operation on the six magnet rings 3, all the knobs 4 can be aligned in the horizontal direction. Of course, the direction of alignment is not limited to the horizontal direction, but can be any direction.

Further, according to the present invention, the entire mechanism can be retracted by the air cylinder 15 when not in use so as not to interfere with other operations. The direction of movement at this time is indicated by the number 18.

FIG. 7 shows an embodiment of the present invention, which is a concrete example of the schematic diagram in FIG.
The conventional magnet ring mechanism shown in the figure is also illustrated.

By aligning the positions of the magnet ring knobs according to the present invention, it has been experimentally demonstrated that the static convergence adjustment time can be reduced by about 40%.

This is before the static convergence adjustment.
This is because a method is advantageously adopted in which the amount of static convergence color shift is determined when the knobs are aligned (the magnet has zero magnetic field) and the adjustment is made based on this.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a color cathode ray tube, deflection yoke, and magnet ring, Fig. 2 is a schematic front view of the magnet ring, Fig. 3 is a schematic perspective view showing a conventional magnet adjustment mechanism, Figs. FIG. 5 is an explanatory view showing the meshing operation of the magnet ring and the idler, FIG. 6 is a schematic explanatory view of the alignment mechanism according to the present invention, and FIG. 7 is a perspective view showing a specific embodiment of the present invention. 1: Color cathode ray tube, 2: Deflection yoke, 3:
Magnet ring, 4: Knob, 5: Teeth, 6: Idler, 11: Pinion, 12: Pinion rotating shaft, 13: Lever for knob detection, 14: Micro switch for knob detection, 15: Air cylinder.

Claims (1)

[Claims] 1. A detection lever that detects the knob of the magnetic ring for adjusting the purity and convergence that is attached to the neck of the color cathode ray tube, a micro switch that detects the movement of the detection lever, and these detection mechanisms are moved and and an air cylinder for retracting the entire mechanism so as not to interfere with the original adjustment operations such as rotation and convergence at other times. .