JPS5929327A - Cathode-ray tube device - Google Patents

Abstract

PURPOSE:To easily correct the deflection amount of electron beams in case the vertical deflection amount of a central electron beam is less than that of both sides electron beams such that they become equal to each other by mounting an approximately L-shaped magnetic piece on the rear part of an insulating frame such that said piece is located between a pair of vertical deflecting coils. CONSTITUTION:A pair of slits 6 into which a magnetic piece 5 can be inserted is provided on the rear part of an insulating frame 1 equipped with a vertical deflecting coil 3 wound around a core 4, and the magnetic piece 5 is attached to said slit 6 movably in the arrow direction. With this constitution, it is possible to increase the deflection amount of the central electron beams by intensifying a vertical deflecting magnetic field at a position Z1 while controlling magnetic flux leakage. Further, the deflecting amount can be controlled by changing the position Z1 by shifting the position of the magnetic piece 5 in the arrow direction. Moreover, it is possible if the magnetic piece 5 is attachably constructed to easily adjust even misconvergence caused by the scatter of the central electron beam deflecting amount produced due to the accuracy of a color cathode-ray tube by exchanging the magnetic piece 5 for new one while preparing magnetic pieces having various different shapes (area and thickness, etc.)

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cathode ray tube device including a deflection yoke suitable for use in an in-line color cathode ray tube.

Conventional configurations and their problems Various attempts have been made to optimally adjust the convergence of deflection yokes.

For example, with respect to vertical deflection as shown in FIG.

When the raster 8 of the center electron beam has a larger vertical deflection amount than that of the electron beams 7 on both sides, a pair of magnetic pieces 2 are removably attached to the back of the insulating frame 1 as shown in FIG. The leakage magnetic flux of the vertical deflection coil 3 is shielded to reduce the raster vertical deflection amount of the central electron beam 8.

Here, as shown in FIG. 3, the position where the magnetic piece 2 is located is the rear end Z1 as well as the position ZO where the magnetic flux of the vertical deflection coil 3 is strongest, so the magnetic flux density rapidly decreases, and the electron beam 7 on both sides Changes in convergence and riding are extremely small, and therefore the required amount of vertical deflection of the central electron beam 8 can be controlled with almost no effect on the electron beams 7 on both sides. Furthermore, by changing the area of the magnetic piece 20, the amount of deflection of the central electron beam 8 can be adjusted in various ways. Note that in FIG. 1, 4 is a vertical core.

However, in this configuration, as shown in FIG. 6, if the vertical deflection of the central electron beam 8 is smaller than the vertical deflection of the electron beams 7 on both sides, the magnetic piece 5 cannot correct it, and the color cathode ray tube itself Modification was required and control was extremely difficult.

OBJECTS OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to easily correct the vertical deflection of the central electron beam in the deflection yoke when it is smaller than that of the electron beams on both sides.

Structure of the Invention In the present invention, an abbreviated magnetic piece is attached to the rear part of an insulating frame so as to be located between a pair of vertical deflection coils, and the leakage magnetic flux of the deflection yoke is used to generate electron beams on both sides and a central electron beam. This is to correct the raster deviation between the two.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Note that in FIG. 2, the same parts as in FIG. 1 are given the same numbers and explained. In FIGS. 2a, b, and c, a pair of slits 6 into which magnetic pieces 6 can be inserted are provided in the rear part of the insulating frame 1 equipped with the vertical deflection coil 3 wound around the core 4. The magnetic piece 6 is attached so as to be movable in the direction of the arrow shown in FIG.

With this configuration, the amount of deflection of the central electron beam 8 can be increased by controlling the leakage magnetic flux and strengthening the vertical deflection magnetic field at position z1 in FIG.

In addition, by moving the position of the magnetic piece 5 in the direction of the arrow, the position Z1 can be changed and controlled. Furthermore, if the magnetic piece 6 is configured to be detachable, the central electron Misconvergence due to variations in the amount of beam deflection can also be easily adjusted by preparing various magnetic pieces 6 with different shapes (area, thickness, etc.) and replacing them.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, in a deflection yoke used for an in-line color cathode ray tube, an abbreviated magnetic piece is provided at the rear part of an insulating frame to be located between a pair of vertical deflection coils. By attaching 5, -, . . , it is possible to easily correct the vertical deflection of the center electron beam to be equal when it is smaller than that of the electron beams on both sides using the leakage magnetic flux.

[Brief explanation of the drawing]

Figure 1 is a rear view of the deflection yoke in the conventional example, Figure 2a
, b, and c are side and rear views of a deflection yoke used in a cathode ray tube device according to an embodiment of the present invention, FIG. 3 is a characteristic diagram showing a vertical magnetic field, and FIGS. 4 and 6 explain raster deviation. This is a diagram for 1...Insulation frame, 3...Vertical deflection coil, 4
... Core, 6 ... Magnetic piece. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 (α) and b (C) Figure 3 Figure 4 Figure 5 Figure 12

Claims (1)

[Claims] It comprises a cathode ray tube in which an electron gun is arranged in a straight line and the amount of vertical deflection of the central electron beam is set smaller than that of the electron beams on both sides, and a deflection yoke attached to the cathode ray tube, the deflection yoke having a pair of vertical deflections. A cathode ray tube device in which a magnetic piece is attached to the rear part of an insulating frame so as to be located between the deflection coils, for increasing the amount of vertical deflection of a forward-bending center electron beam and aligning the rasters of both beams.