JPH04206332A - Deflecting yoke - Google Patents

Abstract

PURPOSE:To ensure a sufficient neck shadow tolerance by disposing a pair of magnetic pieces in a window part having no coil on the X-axis of the front part opened in a funnel form of a saddle vertical deflecting call so as to make contact with a ferrite core. CONSTITUTION:Both vertical deflecting coils 2, 2' are of saddle form, and a core 4 is installed between fringes of an opening part and a neck part outside the vertical deflecting coils 2, 2'. Magnetic pieces 5, 5' are disposed between the opening part fringes 2A, 2'A of the vertical deflecting coils 2, 2' and the core 4 in the form covering the fringes 2A, 2'A. Thus, the opening part fringes 2A, 2'A of the vertical deflecting coils 2, 2' are separated from a deflecting yoke inside by the core 4 and the magnetic pieces 5, 5', and the magnetic fields generated from the fringes 2A, 2'A are absorbed by the magnetic pieces 5, 5', and guided to the outside of the deflecting yoke. Thus, even if the deflecting efficiency of a saddle deflecting yoke is highly improved, a large neck shadow tolerance can be ensured.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a deflection yoke attached to a cathode ray tube used for example in a video display set or a television set. Regarding the saddle/saddle type deflection yoke.

[Conventional technology]

In recent years, television receivers and video display devices have tended to use high-speed horizontal deflection in order to improve image quality. Along with this, heat generation due to the skin effect of the electric wire, hysteresis of the ferrite core, etc. has become a problem, and Lindt wires and low-loss ferrite cores have been adopted as countermeasures to these problems. Also, as a measure against this heat generation, horizontal,
Measures are also used to reduce this heat generation by improving the deflection efficiency of the vertical coil and keeping the deflection current low.

Generally, in order to improve this deflection efficiency, it is known to increase the length of horizontal and vertical deflection coils and ferrite cores, and to reduce the inner diameter of each, but this cannot simply be done infinitely. The performance of these is ultimately determined by the combination with the cathode ray tube.

[Problem to be solved by the invention]

In other words, when this deflection efficiency is greatly improved in combination with a cathode ray tube, the beam emitted from the electron gun in the neck of the cathode ray tube hits the funnel of the cathode ray tube, resulting in a neck shadow that appears as a shadow at the corner of the screen. becomes a problem. Normally, this neck shadow is defined as the distance from when the deflection yoke is attached to the CRT and the deflection yoke is in close contact with the funnel of the CRT until the neck shadow appears at the corner of the screen when the deflection yoke is lowered to the rear. It's called degree. The larger the neck shadow tolerance is, the easier it is to use the device when the deflection yoke and cathode ray tube are used in combination, since there is more margin for adjusting the swing of the deflection yoke.

An object of the present invention is to provide a deflection yoke that can ensure sufficient neck shadow tolerance even when the deflection efficiency is significantly improved.

[Means to solve the problem]

In order to achieve the above purpose, in the saddle-saddle type deflection yoke, the funnel-shaped front part of the vertical deflection coil is
A magnetic piece is placed in the window on the axis where there is no coil, and this magnetic piece is attached so as to be in contact with the ferrite core, and this magnetic piece concentrates the fringe magnetic field of the funnel-shaped front part of the vertical deflection coil. It is designed so that it can be canceled out.

[Effect]

The magnetic pieces arranged in this manner cancel out the magnetic field generated from the fringe part of the funnel-shaped opening of the vertical coil.

As a result, the electron beam that has been deflected by the magnetic field of the fringe portion is no longer affected, and the neck shadow tolerance becomes longer. Furthermore, at the corners of the screen, the secondary distortion at the top/bottom of the screen, which was caused by local deflection, can be improved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a schematic side view of a deflection yoke according to the first embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■' in Fig. 1, and Fig. 3 is a vertical deflection seen from the direction of the arrow ■ in Fig. 1. FIG. 3 is an external view of a coil opening fringe. FIG. 4 is a conceptual diagram of the vertical deflection main magnetic field and the magnetic field generated from the aperture fringe. FIG. 5 is a sectional view of the vicinity of the deflection yoke opening fringe according to the second embodiment of the present invention.

In the figure, 1 is a horizontal deflection coil, 2 and 2' are vertical deflection coils,
3 is a separator for fixing multiple pairs of horizontal and vertical deflection coils and maintaining insulation, and 4 is a core having two split surfaces and forming an annular shape with respect to the pairs.

The multiple pairs of deflection coils are both club-shaped, and the core 4 is mounted outside the vertical deflection coils 2, 2' between the opening and the fringe of the neck. 5.5' is a ferrite core,
It is a magnetic piece made of a magnetic material such as a silicon steel plate, and is arranged between the opening fringe 2A, 2'A of the vertical deflection coil 2.2', the core 4, and the separator 3, and covers the fringe 2A, 2'A. It will be installed in

By installing the magnetic piece 5.5' in this way, the opening fringe 2A, 2'A of the vertical deflection coil 2.2' is isolated from the inside of the deflection yoke by the core 4 and the magnetic pieces 5, 5'. When the main magnetic field of vertical deflection coil 2゜2' is φ9, the magnetic field generated from fringe 2A, 2'A is ΦVF+ Φ
'9. is absorbed by the magnetic piece 5 and led out of the deflection yoke.

The vertical fringe magnetic field ΦVF+ φVF deteriorates the neck shadow tolerance characteristics of both the X component and the Z component.

According to this embodiment, as described above, the vertical fringe magnetic field ΦV
Since it blocks Fr Φ VF, it has the effect of improving the neck shadow tolerance characteristics of the deflection yoke.

Furthermore, the X component of the vertical fringe magnetic field is considered to be one of the causes of second-order distortion called gullwing on the screen, and removing this magnetic field is effective in improving the second-order distortion.

Although FIG. 1 shows an example in which a ferrite core is used as the magnetic material of the magnetic piece 5, a silicon steel plate may be used and the shape as shown in FIG. 5 may be used.

Furthermore, slits may be appropriately added to the magnetic piece 5 to take measures against heat generation due to an increase in the horizontal deflection frequency.

Furthermore, the width of the magnetic piece 5 in the circumferential direction of the fringe shown in FIG. 3 can be set freely, thereby allowing the fringe magnetic field Φ94. Φ′9. You can adjust the degree of cancellation.

〔Effect of the invention〕

According to the present invention, when the deflection efficiency of the saddle/saddle type deflection yoke is greatly improved, it is possible to greatly secure neck shadow tolerance, which is a problem in combination with a cathode ray tube, and also This has the effect of improving the second-order distortion that appears in .

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a deflection yoke according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line nn' in FIG.
FIG. 3 is an external view of the vertical deflection coil opening fringe seen from the direction of the arrow ■ in the figure. FIG. 4 is a conceptual diagram of the vertical deflection main magnetic field and the magnetic field generated from the aperture fringe. FIG. 5 is a sectional view of the vicinity of the deflection yoke opening fringe according to the second embodiment of the present invention. ■...Horizontal deflection coil, 2.2'...Vertical deflection coil, 2A, 2'A...Vertical deflection coil opening side fringe, 3...Separator, 4...Core, 5.5 '...
・Magnetic piece, φ, ... Vertical deflection main magnetic field, φVF, Φ
VF...Vertical deflection coil opening fringe magnetic field.・-Gi, Agent Patent Attorney Kenjibu Take '11. '+,'l
:':, LF. ---1゛ji' lllllFigure 1=H 12Figure 3Figure 4Figure 5

Claims (1)

[Claims] A separator made of a molded plastic material, a pair of horizontal deflection coils installed in the Y-axis direction inside the separator, and a pair of vertical deflection coils installed outside the separator in the X-axis direction. , a saddle-saddle type deflection yoke consisting of a ferrite core made of a magnetic material attached to the outside of the Cla-shaped vertical deflection coil, and a coil on the X-axis of the funnel-shaped front portion of the Cla-shaped vertical deflection coil; A deflection yoke characterized in that at least a pair of magnetic pieces are arranged in a window portion without a ferrite core so as to be in contact with a ferrite core.