JP3361960B2 - Magnet ring magnetization method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic generator and a convergence device suitable for controlling an electron beam by generating a magnetic field at a neck portion of a cathode ray tube in a color cathode ray tube display device. The present invention relates to a correction device and a method for magnetizing a magnet ring. 2. Description of the Related Art In a color cathode ray tube display device, red, green, and blue are respectively provided by two ring-shaped plastic magnets (magnet rings) of two poles, four poles, and six poles mounted on a neck portion of a cathode ray tube. Each electron beam is adjusted. In the center convergence adjustment, the rotation angles of the two bipolar magnet rings are relatively changed so that the red, green, and green beams are positioned at the center of the cross hatch pattern.
Globally adjust the blue (R, G, B) beam. Next, 2
The rotation angles of the four-pole magnet rings are adjusted to adjust the red and blue beams in opposite directions so that the red and blue beams overlap. Further, the rotation angles of the two six-pole magnet rings are adjusted, and the red and blue beams are adjusted in the same direction so that the red and blue beams overlapped by the four-pole magnet ring overlap the green beam. With such central convergence adjustment,
The red, green, and blue beams are focused on the same point (center) on the crosshatch pattern. By the way, in order to adjust the center convergence using the ring-shaped plastic magnet, it is necessary that a certain distance or more exists between the beams of each color. On the other hand, in recent display devices, the accuracy of assembling a CRT gun has been improved in order to reduce the screen distortion, and there has been a display device in which the gap between beams is suppressed to about 0 to 0.5 mm. [0005] However, when the gap between the beams of each color is about 0 to 0.5 mm, the adjustment of the six-pole magnet ring becomes critical, the difficulty of adjustment increases, and the work efficiency decreases. However, in some cases, there is a problem that some adjustments cannot be made. [0006] Also, due to assembly variations during the production process of the cathode ray tube, the intervals between the red, green and blue electron beams are different for each cathode ray tube. The workability was degraded due to measures such as changing the magnet ring or replacing the magnet ring with a magnetized amount. SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and is applicable to various CRTs in which the center convergence can be easily adjusted and the beam interval varies even in a cathode ray tube having a small beam separation. Also change the mounting position,
It is an object of the present invention to provide a magnet component, a magnetic generator, a convergence correction device, and a magnet component magnetizing method that do not need to be changed to an adjustment magnet ring having a different magnetization amount. [0008] The present invention has taken the following measures in order to solve the above-mentioned problems. One or more sets of N and S poles are arranged so as to surround the traveling path of the electron beam, and the N pole and the S pole corresponding thereto are arranged.
This is a magnetic generator in which the amount of magnetization of the pole has a magnetization difference. With such a configuration, there is an effect that the adjustable range near zero magnetic force is increased due to the difference in magnetization between the N pole and the S pole. In the convergence correction device, a magnetizing difference is provided between the magnetizing amounts of the N pole and the S pole of the magnet ring disposed at the neck of the cathode ray tube. With such a configuration, the centers of the magnetic forces of the two magnet rings are displaced, and the vicinity of zero magnetic force is obscured, so that the adjustable range is increased. In the convergence correction device, the number of windings of the N and S poles of the convergence yoke arranged at the neck of the cathode ray tube is made different. With such a configuration, the centers of the magnetic forces of the two convergence yokes are displaced, and the vicinity of zero magnetic force becomes ambiguous, and the adjustable range increases. In the convergence correction device, the convergence yoke has a structure in which a coil is wound around one of an N pole and an S pole. With such a configuration, the adjustable range is increased, and power is saved. The first aspect of the present invention is a magnetizing method for performing unbalanced magnetization such that a difference in magnetization occurs between the N pole and the S pole formed on the magnet ring. According to such a magnetizing method, there is an effect that the N pole and the S pole formed on the magnet ring are unbalanced magnetized. According to the first aspect of the present invention, a winding is applied to only one of the N pole and the S pole of a magnetized head having an N pole and an S pole to flow a current. According to such a magnetizing method, the N-pole and the S-pole formed on the magnet ring are unbalanced magnetized, and the power is saved. Embodiments of the present invention will be specifically described below with reference to the drawings. (Embodiment 1) Embodiment 1 is an example in which the magnet component of the present invention is applied to an adjustment magnet ring of a central convergence adjustment device for controlling an electron beam at a CRT neck portion. In the adjustment magnet ring of the present embodiment, the magnetic force of the N pole and the magnetic force of the S pole are different for each pair of the N pole and the S pole. FIG. 1 shows the magnetic force curve characteristics of a Y-magnetized magnet ring and a general six-pole magnet ring according to the present embodiment. Here, a magnet ring in which a member serving as a base of the magnet ring is subjected to unbalanced magnetization with different amounts of magnetization between the paired N and S poles is called an unbalanced magnetized magnet ring. ,
Particularly, an unbalanced magnetized six-pole magnet ring is referred to as a Y magnetized magnet ring. Note that a general six-pole magnet ring is a magnet ring that has been subjected to balanced magnetization so that the amount of magnetization is the same for the N pole and the S pole that make up a pair, respectively. It is magnetized. The magnetic force characteristic curve in FIG. 1 shows the change in the magnetic flux density of the N pole and the S pole with respect to the rotation angle when the unbalanced magnetized magnet ring and the six-pole magnet ring are rotated once. The magnetic force characteristic curve indicated by a solid line in the figure is that of an unbalanced magnetized magnet ring, and the magnetic force characteristic curve partially indicated by a dotted line on the S pole side is that of a six-pole magnet ring. As shown in the figure, the peak on the S pole side of the unbalanced magnetized magnet ring is about 24% lower than that of the six-pole magnet ring. FIGS. 2 and 3 show the rotational magnetic force when the two Y-magnetized magnet rings and the six-pole magnet rings having the above-mentioned magnetic force curve characteristics were attached to the CRT neck and rotated 360 degrees. The results are shown. FIG. 2 shows the result of measurement of the Y-magnetized magnet ring, showing the state of change at the center. As shown in the figure, when the relative rotation angle of the two Y-magnetized magnet rings is increased, the magnetic force is maximized. However, when the relative rotation angle of the Y-magnetized magnet ring is minimized, the magnetic field near zero is reduced. As the balance is lost (fuzzy), an ambiguous magnetic force is created. FIG. 3 compares the magnetic force change ranges of the Y magnetized magnet ring and the six-pole magnet ring. The magnetic force characteristics shown in FIGS. 1 to 3 are those of a Y-magnetized magnet ring in which a six-pole magnet ring is unbalanced. By making the magnetic force different from that of the S pole, when the relative rotation angle of the two magnet rings is minimized, the balance of the magnetic field near zero is broken, and an effect that an ambiguous magnetic force is generated is exhibited. In this embodiment, the center convergence correction device is constituted by using the unbalanced magnetized magnet ring having the above-described magnetic force characteristics. FIG. 4 shows a state in which an unbalanced magnetized magnet ring is mounted on the neck portion of a cathode ray tube, and FIG. 5 shows an arrangement state of two 6-pole (Y-magnetized), 4-pole, and 2-pole magnet rings. ing. In this center convergence correction apparatus, when the two Y magnetized magnet rings are closed so that the claws overlap and the relative rotation angle of the Y magnetized magnet ring is minimized, as described above, the magnetic field near zero is obtained. The imbalance is lost and an ambiguous magnetic force is created. Therefore, R,
Even if the opening between the G and B beams is about 0 to 0.5 mm from the center, the opening of the claws of the two Y-magnetized magnet rings can be adjusted within an easy-to-operate range. Also, R,
If the gap between the G and B beams is large, it can be dealt with by increasing the gap between the claws of the two Y magnetized magnet rings. According to such an embodiment, the unbalanced magnetization is performed so as to provide a difference in the amount of magnetization between the N and S poles of the magnet ring. Easy adjustment of convergence,
In addition, it is not necessary to change the mounting position and the magnet ring having a different amount of magnetization for various CRTs having various beam intervals, and thus the operability can be greatly improved. (Embodiment 2) An unbalanced magnetization method for performing unbalanced magnetization on a magnet ring will be described. FIG. 6 is a conceptual diagram of the unbalanced magnetizing method according to the present embodiment. The magnetizing head is arranged so as to be inscribed in the plastic magnet ring (unmagnetized) 10 to be magnetized. The magnetizing head is wound around three core magnetized yokes 11 to 13 and the N pole side ends of the core magnetized yokes 11 to 13 and supplied with magnetizing current from an electric circuit (not shown). And lines 14-16. By supplying a current from an electric circuit to the windings 14 to 16 of the magnetizing head configured as described above, for example, 1.7 is applied to each N pole of the plastic magnet ring 10.
G magnetization can be performed. At this time, a smaller magnetic force is generated on the S-pole side of the core-magnetized yokes 11 to 13 than on the N-pole side, so that each S
The pole is magnetized with a smaller magnetic force than the N pole. As a result, the amount of magnetization differs between the N pole and the S pole of the plastic magnet ring 10, and an unbalanced magnetized magnet ring is produced. A two-pole or four-pole unbalanced magnetized magnet ring can be formed in a similar manner by selecting the winding attachment position of the magnetized head. Comparative Example Table 1 shows the evaluation results of a six-pole unbalanced magnet ring manufactured by the unbalanced magnetization method of the present invention and a six-pole magnet ring manufactured by the conventional balanced magnetization method. [Table 1] According to such an embodiment, it is possible to produce an unbalanced magnetized magnet ring having the above-mentioned excellent effects. Also, in the balanced magnetization, the current was supplied to the six windings provided for each of the six poles, whereas in the unbalanced magnetization, the same level of current was supplied to the winding of one of the poles. Since it is sufficient to supply the power, it is possible to save power during the production of the adjustment magnet ring. In the above description, two unbalanced magnets, magnetic force distribution,
Although the magnetic flux density and the magnetizing method have been described, the same applies to other pole numbers. (Embodiment 3) FIGS. 7A and 7B show a configuration example of two 6-pole convergence yokes provided in a center convergence correction device. In this convergence yoke, a coil is wound around six poles of a core having eight poles to form three sets of north and south poles,
The number of turns of the coil differs between the N pole and the S pole. The convergence yoke shown in FIG. 4A generates a magnetic field for deflecting the R and B electron beams in the X direction, and the convergence yoke shown in FIG. 6B shows a magnetic field for deflecting the R and B electron beams in the Y direction. Generate. According to such a convergence yoke, it is possible to cause a magnetization difference between the N pole and the S pole in the neck portion of the cathode ray tube, and even in a cathode ray tube having a small beam gap as in the first embodiment. Adjustment of center convergence is easy, and workability can be greatly improved. Even if a winding is provided only on the N pole and no winding is provided on the S pole, unbalanced magnetization can be realized, and power saving can be achieved. The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. As described above in detail, according to the present invention, the center convergence can be easily adjusted even in a cathode ray tube having a small gap between beams, and various types of light sources having various beam intervals vary. Change of mounting position for CRT,
There is no need to change to a magnet ring having a different amount of magnetization, and workability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a magnetic force characteristic diagram of an unbalanced magnetized magnet ring provided in a center convergence correction device according to Embodiment 1 of the present invention. FIG. 2 is a magnetic force characteristic diagram showing a magnetic force change near zero of the unbalanced magnetized magnet ring according to the first embodiment. FIG. 3 is a magnetic force characteristic diagram showing a magnetic force change range of the unbalanced magnetized magnet ring and the six-pole magnet ring in the first embodiment. FIG. 4 is a side view showing a magnet arrangement of the center convergence correction device according to the first embodiment. FIG. 5 is a perspective view of a magnet ring according to the first embodiment. FIG. 6 is a configuration diagram of a magnetization head used in an unbalanced magnetization method according to a second embodiment of the present invention. FIG. 7 is a plan view of a convergence yoke of the center convergence correction device according to the third embodiment of the present invention. [Description of Signs] 10 Plastic magnet rings 11 to 13 Iron magnetized yokes 14 to 16 Windings

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 29/54 H04N 9/28 H01J 29/76

Claims (1)

(57) [Claim 1] A magnetizing head having an N pole and an S pole is provided with a winding only on one of the N pole and the S pole so that a current flows .
At the same time, the N-pole and S-pole
Perform unbalanced magnetization so that a difference in magnetization occurs in the amount of magnetism.
A method for magnetizing a magnet ring, comprising: