JPS59173932A - Production method of crt - Google Patents

Abstract

PURPOSE:To improve the magnetizing efficiency of a magnetic field generating member by arranging the magnetis field generating member between a pair of magnetic poles generating different magnetic flux densities. CONSTITUTION:The neck section 1b of a CRT is inserted between a magnetic pole 8a and a magnetic material 10, and the magnetic material 10 is moved upward so as to pinch the outer periphery of a magnetic field generating member 6. Next, when a current is fed through a coil 9, lines of magnetic force are generated from the tip of the magnetic pole 8a toward the magnetic material 10, and the magnetic flux density is largest at the tip portion of the magnetic pole 8a at this time. And by forming the magnetic material 10 so that the distance between the magnetic pole 8a and magnetic material 10 becomes shortest at a position passing through a tube axis, lines of magnetic force are generated on the magnetic field generating member 6 corresponding to the tip of the magnetic pole 8a in the thickness direction, i.e., the same direction as the easy-magnetization axis, thus allowing effective magnetization.

Description

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

In FIG. 1 showing a conventional cathode ray tube device, (1) is a color cathode ray tube device, which includes a fluorescent screen (2) formed on the inner surface of a panel portion (1a), a shadow mask (3), and a fluorescent screen. (2) Neck part facing 2 (+ to 1)
) It is formed with a built-in Ichiko gun (4) arranged in K. (6) is the funnel part (1c) of the cathode ray tube (1)
A deflection yoke attached to the outer periphery deflects the 7" beam formed by the scoop gun (4) horizontally and vertically. (6) is a ferrite magnet all cathode @ SugatN made of rubber. A magnetic field generating member wrapped around the outer periphery of the neck portion (1b), which provides the electron beam with a corrective magnetic field that allows the center of the stripe width on the fluorescent screen (2) to coincide with the center of the width of the electron beam. be.

As shown in Fig. 2, this correction magnetic field is applied by rotating the magnetizing head (7), which consists of a pair of adjacent magnetic poles, while bringing the entire magnetic field generating member (6) into close contact with the outer circumference VC, and applying it to the S pole or 1-j N pole. It is formed by sequential magnetization.

By the way, the axis of easy magnetization of the magnetic field generating member fi+ is formed in a direction perpendicular to the tube axis of the cathode ray tube, and when using 'fx magnetization as shown in Figure 2, the magnetic flux is perpendicular to the axis of easy magnetization. Since the magnetic flux is generated in the direction of
``Nausea and yellowing were also a major problem.

This invention was made to eliminate the above-mentioned drawbacks of L12, and is a cathode with improved magnetization efficiency. ! A method for manufacturing a tube is provided.

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

Figure 3 shows a magnetizing device according to the present invention, which includes a core (8) formed in an E-shape, and a coil (9) attached to the central magnetic pole (8a) of this core (8). , core (8)
It is formed from an arcuate magnetic body (10) slidably attached to the magnetic poles (8b) on both sides of the magnetic body. That is, a magnetized head having different magnetic flux densities is formed between the magnetic pole (8a) and the magnetic body (+01 and VCL).

Using such a magnetizing device, first, the neck part (1b), the f magnetic pole (8a) and the magnetic body (lO
) to move the magnetic material (lO) upward,
As shown in FIG. 4, they are arranged so as to sandwich the outer periphery of the magnetic field generating member (6). Next, when a current is passed through the coil (9),
Lines of magnetic force are generated from the tip of the magnetic pole (8a) toward the magnetic body (101K, and at this time, the tip of the magnetic pole (8a) has the maximum magnetic flux density. By forming the magnetic material f101k so that the distance of lO) is the shortest at the position passing through the tube axis, the magnetic field generating member (6) corresponding to the tip of the magnetic pole (8a) has lines of magnetic force in the thickness direction, that is, easy to magnetize. All VC will be generated in the same direction as the axis, making it possible to effectively magnetize VC4.After that, a pulse motor will be used to create a magnetizing device f1.
It rotates at a pitch of /200 and the magnetic pole (8a) f
The magnetic field generating member (6) may be switched between the N pole and the S pole (6).The process is completed by sequentially magnetizing the magnetic field generating member (6).

Note that the magnetizing magnetic field and strength are determined by detecting the relative deviation between the musical accompaniment beam and the fluorescent light emitting section, and calculating the total magnetic field required to fully correct the kneading. 1 ox,
The width of the magnet 4 (8a) WH must be about twice the thickness of the magnetic field generating member (6), and the total thickness of the magnetic field generating member (6) is 0. If 'i' is 6mm, then it needs to be formed to 1.5mm. Furthermore, the wall thickness t of the magnetic pole (8a) is approximately 5 rnm.
Vc shadow is formed.

By forming in this way, the magnetic field generating member +61
It becomes possible to narrow the width of the magnetic field in the VC and to achieve strong magnetization, thereby making it possible to completely improve the accuracy of the trajectory correction of the accompaniment beam.

In the above-mentioned embodiment, the core t81'ThK-shape was formed, and the magnetic material (lO) was installed on both IJllll magnetic poles (8b) l+'j. 10) may be used as a free end, and the magnetic field generating member (6) may be connected to the neck portion (lb) of the cathode ray #(1).
) may be placed within.

Alternatively, the magnetizing device may be fixed and the cathode ray tube (1) may be configured to rotate.

As described above, according to the present invention, it is possible to improve the viewing efficiency of the magnetic field generating member, and the practical value of the present invention is great.

[Brief explanation of the drawing]

Figure 1 shows the configuration of a color cathode ray tube? Fig. 2 is a schematic diagram showing the conventional magnetization method, Fig. 3 is a schematic diagram showing the conventional magnetization method, and Fig. 3 is a schematic diagram showing the conventional magnetization method.
A magnetizing device that can be used? FIG. 4 is a schematic diagram showing a detection method which is an embodiment of this power. In the figure, (1) is the cathode ray tube, (1b) is the neck, (6)
magnetic field generating member, (8) is the core, (9) is the coil, (1
o) is a magnetic material. In the figures, the same reference numerals indicate corresponding parts. Figure 1 Figure 2

Claims (1)

[Claims] As a means of magnetizing the annular magnetic field generating member provided at the neck of the cathode ray tube, the magnetic field generating member is placed between a pair of magnetic poles that generate different magnetic flux densities, and the cathode ray tube is completely rotated across the magnetic poles. A method for manufacturing a cathode ray tube, characterized in that the cathode ray tube is magnetized by the following steps.