JPS59165345A - Cathode-ray tube device - Google Patents

Abstract

PURPOSE:To improve magnetizing efficiency by setting up a magnetic field generating member with the mounting part fixed on the outer periphery of a cathode-ray tube and the magnetic field generating part magnetized through its gap provided toward the cathode-ray tube outer periphery. CONSTITUTION:A magnetic field generating member consists of a mounting part 8a having the inner diameter about the same as the outer diameter of the neck part 1a and the magnetic field generating part 8b which is a tubular part formed with its gap toward the outer periphery of the neck part 1a. When magnetizing, the plate part 10a of the magnetizing head 10 is inserted into a gap between the magnetic field generating part 8b and the neck part 1a to be held therein. Next, while pressing the tip part 10b against the magnetic field generating part 8b for rotating it at a pitch of an equally divided 200th by a pulse motor or the like, a current is made to flow through a coil, while following said rotation, in order to magnetize successively patterns required for correction. In this way, the magnetic flux generating direction of the magnetic head 10 can be made to accord with an axis, easy for magnetization, of the magnetic field generating part 8b, thus making it possible to magnetize efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cathode ray tube device for correcting the trajectory of an electron beam.

In FIG. 1 showing a conventional cathode ray tube device of this type, (1
1 shows a color cathode ray tube, which includes a fluorescent screen (2) formed on the inner surface of the panel part (1a) and a shadow mask (
3) Attach the neck part (opposed to the edict and the fluorescent screen (21)
1b). (51 is a cathode ray tube (11 funnel part (IC)
) A deflection yoke attached to the outer periphery of the electron gun (41) deflects the electron beam formed by the electron gun (41) horizontally and vertically. 1b) A magnetic field generating member wrapped around the outer periphery, and usually a magnetic head (7) as shown in Figure 2 is kept in close contact with the outer periphery and rotated to sequentially magnetize it to the S pole or N pole. .This magnetic field generating member (
Reference numeral 61 functions to provide the electron beam with a correction magnetic field for aligning the center of the stripe width on the fluorescent screen (21) with the center of the width of the electron beam.

By the way, the axis of easy magnetization of the magnetic field generating member (6; is formed in a direction perpendicular to the tube axis of the cathode ray tube (11),
If the magnetization method shown in the figure is used, the magnetic flux will be generated in a direction perpendicular to the axis of easy magnetization, resulting in poor magnetization efficiency and high power consumption as it requires a large magnetic flux density. It became.

This invention was made in view of the above-mentioned drawbacks.
The present invention provides a cathode ray tube device with improved magnetization efficiency.

Hereinafter, FIGS. 3 and 4, which are one embodiment of this invention, will be explained.

In Fig. 3, (8) is a magnetic field generating member which is the main part of the present invention, and is formed by molding a material made of a mixture of Noryl resin and barium ferrite, and has an inner diameter that is almost the same as the outer diameter of the neck part (la). Mounting part (8a) and neck part (1a)
The magnetic field generating part (8b) is a cylindrical part formed with a gap between the magnetic field generating part (8b) and the outer periphery. +91 is a fastening fitting that fastens and fixes the mounting part (8a) to the neck part (1a).

FIG. 4 shows a method of magnetizing such a cathode ray tube device, in which the magnetizing head curve consists of a flat plate portion (10a) formed by cutting out a part of a rectangular core, and a tip portion (10a) opposite to the flat plate portion (10a). 10
b), and this flat plate part (1
0a) is inserted into the gap between the magnetic field generating part (8b) and the l-neck part (1a) and supported. Next, while pressing the pointed end (10a) against the magnetic field generating part (8b), it is rotated at a pitch of 200 equal parts by a pulse motor, etc., and a current is applied to the coil as it rotates, creating the pattern necessary for correction. are sequentially magnetized. The necessary pattern is determined by detecting the relative misalignment between the electron beam and the phosphor light-emitting section and calculating the magnetic field pattern necessary to correct the misalignment using a computer.

With this configuration, the direction of magnetic flux generation in the magnetic head recess can be made to coincide with the axis of easy magnetization of the magnetic field generating portion (8b), making it possible to efficiently perform magnetization. Another advantage is that it does not require a power source that generates a large magnetic field.

In addition, in the above-mentioned embodiment, the magnetic field generating part (8b) was constructed by molding integrally with the mounting part (8a), but it may also be constructed by pasting a magnetic thin film on the inner or outer periphery of the cylindrical part. ,
In this case, the accuracy of the correction magnetic field can be improved.

As described above, according to the present invention, the magnetic field generating member can be efficiently magnetized, and the manufacturing cost of the cathode ray tube can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a conventional cathode ray tube device, FIG. 2 is a schematic diagram showing the magnetization method in FIG. 1, and FIG. 3 is a schematic diagram showing a cathode ray tube device according to an embodiment of the present invention. FIG. 4 is a schematic diagram showing the magnetization method according to the present invention. In the figure, (11 is a cathode ray tube, (1b) is a neck tube, (21 is
(4) is a fluorescent screen, (4) is an electron gun, (151) is a deflection yoke, (8) is a magnetic field generating member, (8a) is a mounting part, (8b)
) is a magnetic field generating part, and σ is a magnetizing head. The same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 0 Figure 2

Claims (1)

[Claims] A +11 cathode ray tube, comprising a magnetic field generating member formed on the electron beam orbit in the cathode ray tube and surrounding the outer periphery of the cathode ray tube, the magnetic field generating member being fixed to the outer periphery of the cathode ray tube. A cathode ray tube device comprising a mounting portion and a magnetized magnetic field generating portion having a gap between the outer periphery of the cathode ray tube. 2. The cathode ray tube device according to claim 1, wherein the C21 magnetic field generating member is composed of an anisotropic magnet, and the axis of easy magnetization thereof is arranged in a direction perpendicular to the tube axis of the cathode ray tube.