JPH0366773B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color picture tube device that is easy to adjust, and particularly to a permanent magnet structure thereof.

Traditionally, in-line color picture tubes have been developed to eliminate the need for television set manufacturers to adjust color purity and static convergence.
As shown in the figure, the picture tube manufacturer installed the deflection yoke and permanent magnet structure, and shipped the product after completing the adjustment. In Fig. 1, 1 is the funnel of the picture tube, 2 is the deflection yoke, and 3 is the outer circumferential surface of the funnel 1 in order to maintain the optimal relative position to the picture tube after adjusting the convergence by swinging the opening side of the deflection yoke. 3 to 6 wedges for fixing the deflection yoke are fitted over the entire circumference in the gap between the opening end 2a of the deflection yoke, 4 is the neck of the picture tube, and 5 is a magnet 10 for adjusting color purity and a quadrupole magnet 8 for adjusting static convergence. , a permanent magnet structure equipped with six-pole magnets 9; 6 a cylindrical magnet holder for attaching the permanent magnet structure 5 to the neck 4; A lock ring 11 is a metal band that tightens the end of the magnet holder 6 to secure the holder to the neck 4, and is tightened in the direction to hold each magnet at the optimal adjustment position.
In this way, the color purity adjustment magnet 10 is located on the side opposite to the phosphor screen, making it difficult to adjust the color purity, and the locking ring 7 is located on the phosphor screen side, making the distance between the permanent magnet structure 5 and the deflection yoke 2 could not be brought close enough to each other, and the lock ring 7 was not close enough to the deflection yoke 2.
The locking operation was difficult because it was located in a narrow area between the two.

SUMMARY OF THE INVENTION An object of the present invention is to provide a color picture tube device that does not have the above-mentioned drawbacks and is equipped with a permanent magnet structure that is easy to adjust.

In order to achieve the above object, in the present invention,
One end of the magnetic holder was provided with a conventionally known male screw for locking engagement, and the other end was provided with a plurality of axially cut grooves that went around the outer surface of the inner cylinder of the holder. The axial cut provides diametrical flexibility at this end. Therefore, a stop ring can be inserted into this end so that its inner edge fits into a groove that goes around the outer surface of the cylinder, and once the inner edge of the stop ring fits into the groove, the stop ring remains as it is (in the diametrical direction). (unless the diameter is reduced by applying pressure), it will not come out in the axial direction and will serve as a stopper. Since this stop ring only has to act as a stopper, both the fitting groove and the stop ring occupy only a small dimension in the axial direction. First, screw the lock ring into the magnetic holder like the one above, then fit and insert the static convergence adjustment magnet (either the 6-pole or 4-pole magnet can be placed first), and then the color purity adjustment magnet. Finally, the inner edge of the stop ring is fitted into a structure that goes around the cylindrical outer surface of the end of the magnetic holder so that it functions as a stopper. As is well known, each of the above three types of magnets is of course composed of a set of two flat annular permanent magnets. A magnet holder with three types of magnets inserted as described above is attached to the outer periphery of the neck with the lock ring facing the electron gun and the stop ring facing the phosphor screen, and the positions of each magnet are adjusted to obtain the best color purity and static convergence. After adjusting the magnets, tighten the lock ring in the direction of the stop ring so that the optimal relative position of each magnet with respect to the cathode ray tube will not be disturbed. In this way, the color purity adjusting magnet approaches the phosphor screen side, and the color purity can be adjusted sufficiently. Further, the locking operation of the locking ring becomes easier.

FIG. 2 shows an installed state of an embodiment of the present invention,
13 is a stop ring, and the other symbols are the same as in FIG. By fitting the stop ring 13 to the magnet holder 6, each magnet can be easily fixed without falling apart. Furthermore, since the outer diameter of the end of the magnet holder 6 can be made the same as the inner diameter of each magnet, Fitting and insertion becomes easy, and automatic assembly becomes possible. FIG. 3 is a view of only the permanent magnet structure of the present invention viewed from the metal band 11 side, and FIG. 4 is a side view of only the permanent magnet structure of the present invention, where 12 is a spacer and other symbols are the same as those in FIG. 2. The same is true. FIG. 5 is a side view of the magnetic holder 6 according to the present invention, where 6a is a circumferential structure into which the inner edge of the stop ring fits, 6b is an axial notch, 6c is a male thread that screws into the lock ring, and the notch 6b is a For example, for a piece with a width of about 1 mm, the circumference is 6~
All you need to do is set up 10 locations. FIG. 6 is a side sectional view of the stop ring 13 according to the present invention, in which the cross-sectional shape of the inner edge is inclined on the push-in side so that it can be easily inserted into the end of the magnetic holder 6.

As explained above, according to the present invention, each adjustment magnet, especially the color purity adjustment magnet, can be operated easily and reliably, the locking operation of the locking ring is also facilitated, and the automatic assembly of the permanent magnet structure is facilitated. This makes assembly easier and reduces assembly costs.

[Brief explanation of drawings]

FIG. 1 is a diagram of a conventional permanent magnet assembly in an installed state, FIG. 2 is a diagram of an embodiment of the present invention in an installed state, FIG. 3 is a diagram of the permanent magnet assembly of the present invention viewed from the metal band side, and FIG. 4 is a diagram of an installed state of a conventional permanent magnet structure. FIG. 5 is a side view of a permanent magnet structure according to the present invention, FIG. 5 is a side view of a magnet holder according to the present invention, and FIG. 6 is a side sectional view of a stop ring according to the present invention. 4...Net, 5...Permanent magnet structure, 6...Magnetic holder, 6a...Circumferential structure provided at the end, 6b...Axial notch, 7...Lock ring, 8...4-pole magnet , 9... 6-pole magnet, 10...
Magnet for color purity adjustment, 11...Metal band, 13...
...stop spring.

Claims (1)

[Claims] 1. Consists of a magnet holder attached to the outer periphery of the neck of a color picture tube, and a pair of annular permanent magnet plates, each of which is fixed to the outer periphery of the magnet holder by being separated from each other by a spacer and tightened in the tube axis direction by a locking ring. In a color picture tube device, in which a permanent magnet assembly including a color purity adjustment magnet and a 4-pole magnet and a 6-pole magnet for static convergence adjustment is attached to the outer periphery of the neck of the color picture tube, a locking ring is attached to one end of the magnet holder. The other end has multiple axial notches, and the inner edge of the stop ring is fitted irreversibly in the axial direction by utilizing the diametrical flexibility created by these notches. A locking ring is screwed onto this magnet holder, and then a 4-pole magnet and a 6-pole magnet for static convergence adjustment are installed in the order of 6 poles and 4 poles, or in the order of 4 poles and 6 poles. Insert the color purity adjustment magnet, and finally fit the above stop ring into the circumferential groove and attach it to the outer periphery of the neck so that the stop ring is on the phosphor screen side and the lock ring is on the electron gun side, and each magnet is optimized. 1. A color picture tube device, wherein the color picture tube device is configured to hold the position by tightening the stop ring in the direction of the stop ring after adjusting the stop ring.