JPH1154068A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke wherein a ringing phenomenon of horizontal deflection current is reduced and a vertical stripe pattern on an image plane is eliminated. SOLUTION: This deflection yoke is equipped with a pair of funnel-shaped cores 3, vertical deflection coils 6 wound around the respective cores 3, a winding frame 1 provided inside the vertical deflection coils 6, and a horizontal deflection coil 2 provided inside the winding frame 1. Ringing damping circuits, which each form a magnetic field in the reverse direction to a magnetic field formed by the horizontal deflection coil 2 and have the same resonance frequency as a ringing frequency of a horizontal deflection current, are provided between the vertical deflection coils 6 and the horizontal deflection coil 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke combined with a cathode ray tube used in a television receiver or the like.

[0002]

2. Description of the Related Art A conventional deflection yoke will be described below with reference to the drawings. FIG. 5 is an exploded side view of a conventional deflection yoke. 5, reference numeral 1 denotes a winding frame, and a pair of horizontal deflection coils 2 are provided inside the winding frame 1. Reference numeral 3 denotes a pair of funnel-shaped cores.
Is a winding guide frame fixed to the small-diameter end of the core 3 for positioning and guiding the winding of the winding; and 5 is fixed to the large-diameter end of the core 3 for positioning and guiding the winding. The winding guide frames 6 are vertical deflection coils wound through winding guide frames 4 and 5 fixed to the core 3.

[0003] A deflecting yoke is formed by abutting butting surfaces of a pair of cores 3 around which a vertical deflection coil 6 is wound so as to cover the outer peripheral side of the winding frame 1.

The operation of the conventional deflection yoke configured as described above will be described. The respective sawtooth currents are supplied to the horizontal deflection coil 2 and the vertical deflection coil 6, and the electron beam is deflected by the deflection magnetic fields generated by the respective sawtooth currents.

[0005]

In such a deflection yoke, as shown in FIG. 6, the change in the retrace period of the horizontal deflection current 7 is caused by the resonance frequency associated with the stray capacitance between the windings of the horizontal deflection coil 2. The current waveform 8 of the ringing phenomenon occurs in an intense region, and this current waveform 8 has a problem that a vertical stripe pattern 10 is generated at the left end portion of the screen 9 shown in FIG.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve these conventional problems, and an object of the present invention is to provide a deflection yoke which reduces a ringing phenomenon of a horizontal deflection current and eliminates a vertical stripe pattern on a screen.

[0007]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a horizontal deflection coil which forms a magnetic field between a vertical deflection coil and a horizontal deflection coil in a direction opposite to that of the horizontal deflection coil. A ringing attenuation circuit having a resonance frequency equal to the current ringing frequency is provided.

According to the present invention, it is possible to obtain a deflection yoke in which the ringing phenomenon of the horizontal deflection current is reduced and the vertical stripe pattern on the screen is eliminated.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a funnel-shaped pair of cores, a vertical deflection coil wound around each of the cores, and a winding provided inside the vertical deflection coil. A wire frame, and a horizontal deflection coil provided inside the winding frame; a horizontal deflection coil is formed between the vertical deflection coil and the horizontal deflection coil by forming a magnetic field in a direction opposite to a magnetic field formed by the horizontal deflection coil; A ringing attenuation circuit having a resonance frequency equal to the ringing frequency of the current is provided, and has an effect of consuming the energy of the ringing phenomenon of the horizontal deflection current.

According to a second aspect of the present invention, the ringing attenuation circuit is configured by connecting an auxiliary coil, a capacitor, and a resistor in series, and the resonance frequency is easily made equal to the ringing frequency. Has an action.

According to a third aspect of the present invention, the auxiliary coil is wound around a groove formed on the outer surface of the winding frame, and the auxiliary coil can be easily wound. It has the action of:

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is an exploded side view of a deflection yoke according to Embodiment 1 of the present invention. In FIG. 1, components having the same reference numerals as those of the conventional example are basically the same. In FIG. 1, 1 is a winding frame, 2 is a horizontal deflection coil, 3 is a pair of cores, 4 and 5 are winding guide frames, 6 is a vertical deflection coil, 11
Is a pair of auxiliary coils provided between the vertical deflection coil 6 and the horizontal deflection coil 2, and the auxiliary coil 11 generates a magnetic field in a direction opposite to the magnetic field formed by the horizontal deflection coil 2. Then, a ringing damping circuit is formed by connecting a capacitor 12 and a resistor 13 described later in series to the auxiliary coil 11. Then, a pair of cores 3 around which the vertical deflection coil 6 is wound so as to cover the outer peripheral side of the winding frame 1.
The butting surfaces are butted against each other to form a deflection yoke.

Next, the operation of the deflection yoke according to the first embodiment of the present invention will be described below. FIG. 2 is a diagram showing a circuit configuration of the horizontal deflection coil and the auxiliary coil of the deflection yoke according to the first embodiment of the present invention. FIG. 3 is a diagram showing the magnetic field of the horizontal deflection coil and the auxiliary coil of the deflection yoke according to the first embodiment of the present invention. It is sectional drawing explaining. 2 and 3, reference numeral 12 denotes a capacitor connected to one end of the auxiliary coil 11, and reference numeral 13 denotes a resistor connected to the other end of the auxiliary coil 11 and the capacitor 12. Thus, the ringing damping circuit is formed by connecting the auxiliary coil 11, the capacitor 12, and the resistor 13 in series. In forming this ringing attenuation circuit, the capacitor 12 is selected and connected so as to have a resonance frequency equivalent to the ringing frequency of the horizontal deflection current 7 generated due to the stray capacitance of the horizontal deflection coil 2. The term “equivalent” includes the case where the resonance frequency is almost the same as the resonance frequency. The horizontal deflection coil 2 and the auxiliary coil 11 are magnetically coupled via the core 3.

When the horizontal deflection current 7 is supplied to the horizontal deflection coil 2 in the direction of arrow 14, the magnetic field generated by the horizontal deflection coil 2 is generated in the direction of arrow 15. Since the auxiliary coil 11 is magnetically coupled to the horizontal deflection coil 2 to form a magnetic field in a direction opposite to the magnetic field formed by the horizontal deflection coil 2, the voltage induced by the auxiliary coil 11 is ringing. A current flows in the direction of arrow 16 of the attenuation circuit. Since the capacitor 12 is selected in the ringing attenuation circuit so as to have a resonance frequency equivalent to the ringing frequency of the horizontal deflection current 7, when the current flows in the direction of the arrow 16, the resistor 13 removes the energy of the ringing frequency component. Can be consumed. Since the energy of the ringing frequency component is consumed by the resistor 13 in this manner, the ringing phenomenon in the retrace period of the horizontal deflection current 7 in the horizontal deflection coil 2 is reduced, and the vertical stripe pattern at the left end of the screen can be eliminated. it can.

(Embodiment 2) In Embodiment 1 of the present invention, the pair of auxiliary coils 11 are provided between the vertical deflection coil 6 and the winding frame 1. However, as shown in FIG. May be. FIG. 4 is a side view showing an auxiliary coil wound in a groove formed on an outer surface of a winding frame of a deflection yoke according to a second embodiment of the present invention. In FIG. 4, reference numeral 17 denotes a winding frame around which a horizontal deflection coil (not shown) is wound, and 18 denotes a pair of bracket-shaped grooves formed on the outer surface of the winding frame 17.
Reference numeral 9 denotes an auxiliary coil wound around the groove 18, respectively.

When the auxiliary coil 19 is wound around the groove 18 formed on the outer surface of the winding frame 17, the auxiliary coil 19 is securely positioned by the groove 18 and the auxiliary coil 19 is easily wound. Can be turned. The auxiliary coil 19 can easily form a magnetic field in the direction opposite to the magnetic field formed by the horizontal deflection coil. Since a ringing attenuating circuit can be formed by connecting a capacitor and a resistor to the auxiliary coil 19, the ringing phenomenon during the retrace period of the horizontal deflection current in the operation of the deflection yoke is reduced, and the vertical stripes on the left end of the screen are displayed. Patterns can be eliminated.

[0017]

As described above, according to the present invention, there is provided a ringing attenuation circuit having a resonance frequency equal to the ringing frequency of the horizontal deflection current by forming a magnetic field in the direction opposite to the magnetic field formed by the horizontal deflection coil. Therefore, the ringing phenomenon during the retrace period of the horizontal deflection current is reduced, and the vertical stripe pattern at the left end of the screen can be eliminated. Further, since the ringing damping circuit is configured by connecting the auxiliary coil, the capacitor, and the resistor in series, the resonance frequency can be reliably made equal to the ringing frequency. Also, since the auxiliary coil is wound in a groove formed on the outer surface of the winding frame,
An advantageous effect is obtained that the auxiliary coil can be reliably positioned by the groove and the auxiliary coil can be easily formed.

[Brief description of the drawings]

FIG. 1 is an exploded side view of a deflection yoke according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a circuit configuration of a horizontal deflection coil and an auxiliary coil of the deflection yoke according to the first embodiment of the present invention.

FIG. 3 is a sectional view illustrating a magnetic field of a horizontal deflection coil and an auxiliary coil of the deflection yoke according to the first embodiment of the present invention.

FIG. 4 is a side view showing an auxiliary coil wound in a groove formed on an outer surface of a winding frame of a deflection yoke according to a second embodiment of the present invention.

FIG. 5 is an exploded side view of a conventional deflection yoke.

FIG. 6 is a diagram showing a waveform of a horizontal deflection current of a conventional deflection yoke.

FIG. 7 is a diagram showing a screen using a conventional deflection yoke.

[Explanation of symbols]

 1,17 Winding frame 2 Horizontal deflection coil 3 Core 4,5 Winding guide frame 6 Vertical deflection coil 7 Horizontal deflection current 8 Current waveform 11,19 Auxiliary coil 12 Capacitor 13 Resistance 14,15,16 direction 18 Groove

Claims (3)

[Claims] 1. A funnel-shaped pair of cores, a vertical deflection coil wound around each of the cores, a winding frame provided inside the vertical deflection coil, and a winding frame provided inside the winding frame. A horizontal deflection coil, a magnetic field in the opposite direction to the magnetic field formed by the horizontal deflection coil is formed between the vertical deflection coil and the horizontal deflection coil, and a resonance equal to the ringing frequency of the horizontal deflection current is formed. A deflection yoke comprising a ringing attenuation circuit having a frequency. 2. The deflection yoke according to claim 1, wherein said ringing damping circuit comprises an auxiliary coil, a capacitor and a resistor connected in series. 3. The deflection yoke according to claim 2, wherein the auxiliary coil is wound around a groove formed on an outer surface of the winding frame.