JP3473071B2 - Deflection yoke - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke to be combined with a cathode ray tube used in a television receiver or the like. 2. Description of the Related Art In a deflection yoke combined with a cathode ray tube (hereinafter referred to as "CRT"), generally, a RE on an X-axis on a screen caused by a lateral shift of mounting of a ferrite core.
In order to correct the asymmetry of D and BLUE, magnetic pieces are attached to the left and right of the horizontal deflection coil of the deflection yoke on the electron gun side of the CRT, and the deflection magnetic field of the horizontal deflection coil is corrected to be left and right asymmetric. FIG. 6 is an explanatory diagram showing a state of a magnetic field when a variable resistor is connected to a coma coil in a conventional deflection yoke having a coma coil. In the case of a deflection yoke having a coma coil, as shown in FIG. 6, a coma coil for generating a six-pole magnetic field and an E-shaped magnetic body are mounted on the left and right sides of the electron gun side of the horizontal deflection coil. Little effect can be expected. In such a case, generally, as shown in FIG. 7 to FIG.
Asymmetric misconvergence is corrected by correcting the resulting asymmetric misconvergence on the Y axis by making the left and right magnetic fields of the coma coil asymmetric using a variable resistor as shown in FIG. [0004] However, in the case of the deflection yoke constructed as described above, misconvergence of RED and BLUE in the Y direction on the Y axis caused by swinging left and right is generated from the coma coil. The left and right magnetic fields must be asymmetrically corrected by a variable resistor, which causes the efficiency of the deflection yoke to deteriorate and the circuit to become complicated. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an asymmetrical left and right magnetic field generated from a coma coil without using a variable resistor.
It is an object of the present invention to provide a deflection yoke capable of correcting a BLUE misconvergence. In order to achieve the above object, a deflection yoke according to the present invention comprises a coma coil and an E-shaped magnetic body.
In addition to the neck holder,
Magnetic field on the X-axis for E-shaped magnetic material in the generated six-pole magnetic field
The magnetic piece that is placed in the
A magnetic field that is provided on the magnetic holder of the hopper and forms an asymmetrical magnetic field on the X axis. [0007] Function : Coma coil and E-shaped magnetic material for neck holder
And place the magnetic piece on the magnetic holder of the neck holder.
In the magnetic field on the X-axis generated by the coma coil, the X-axis direction for the E-shaped magnetic body in the hexapole magnetic field
The influence of the direction is partially reduced, and the RED in the Y direction on the Y axis caused by the right and left swing, the misconvergence of BLUE is corrected, and as a result, the RED on the X axis on the screen is
It is possible to correct the asymmetry of the BLUE. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a deflection yoke according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a neck holder. Reference numeral 2 denotes a top coil bobbin around which a top coil is wound, which is mounted on the neck holder 1. Numeral 3 denotes a ferrite core. Due to the misalignment of the ferrite core 3, asymmetry of RED and BLUE on the X axis on the screen occurs. 4 is a wiring board, 5 is a vertical deflection coil. FIG. 2 is a top view of the neck holder of the deflection yoke of the embodiment. In FIG. 2, a coma coil 6 is wound around the coma coil bobbin 2. Reference numeral 7 denotes an E-shaped magnetic body. The E-shaped magnetic body 7 is a top coil bobbin 2
And generates a magnetic field from the tip of the E-shaped magnetic body 7. Reference numeral 8 denotes a magnetic material holder into which a magnetic piece 9 (shown in FIG. 3) is inserted. Magnetic piece 9
Represents the magnetic field on the X-axis of the magnetic field generated from the E-shaped magnetic body 7.
Reduce the number of parts . 11 is a fixed band, 10 is a screw. FIG. 3 shows the influence of the magnetic piece 9 on the coma coil magnetic field generated from the E-shaped magnetic body 7 when the magnetic piece 9 is inserted into the magnetic material holder 8. On the side where the magnetic piece 9 is inserted, a part of the magnetic field of the coma coil 6 goes around in the inserted magnetic piece 9, so that the magnetic field applied to the electron beam of RED decreases and the deflection force FR weakens. That is, left on the X axis
A right asymmetric magnetic field is formed, and the pattern as shown in FIG. 8 can be corrected. FIG. 4 is a wiring diagram of a vertical portion of the deflection yoke of the embodiment. A top coil is connected in series to the vertical coil. As described above, according to the present invention, without deteriorating the deflection efficiency or complicating the circuit, the X-axis on the screen caused by the left and right displacement of the mounting of the ferrite core of the deflection yoke. RED and BLUE can be corrected by reducing a part of the magnetic field generated by the coma coil by the magnetic piece.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a deflection yoke in one embodiment of the present invention. FIG. 2 is a top view of a neck holder of the deflection yoke in one embodiment of the present invention. FIG. 4 is an explanatory view showing a state of a magnetic field when a magnetic piece is attached in the embodiment. FIG. 4 is a wiring diagram of a vertical portion of a deflection yoke of the embodiment. FIG. 5 is a view showing a state of a magnetic field generated by a conventional coma coil. FIG. 6 is an explanatory diagram showing a state of a magnetic field when a variable resistor is connected to a conventional coma coil. FIG. 7 is an explanatory diagram showing an asymmetrical state of RED and BLUE on the X-axis. FIG. 9 is an explanatory view showing a pattern when the asymmetry shown in FIG. 7 is corrected by swinging the deflection yoke. FIG. 9 is an explanatory view showing a state in which the pattern shown in FIG. 8 is corrected by the magnetic field of the coma coil. Coma coil bobbin 3 Ferrite core 4 Wiring board 5 Vertical deflection coil 6 Coma coil 7 E-shaped magnetic body 8 Magnetic body holder 9 Magnetic piece 10 Screw 11 Fixed band

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 29/76 H04N 9/28

Claims (1)

(57) Claims 1. A deflection yoke for generating a deflection magnetic field for deflecting an electron beam of a cathode ray tube, the deflection yoke being located on the electron gun side of the cathode ray tube for generating a six-pole magnetic field. the coma coil and E-shaped magnetic body is provided on the neck holder, the E-shaped magnetic in the 6-pole magnetic field generated in the coma coil
A magnetic piece which is placed in a magnetic field on the X axis with respect to the body to reduce a part thereof is provided on the magnetic material holder of the neck holder;
A deflection yoke, which forms an asymmetric magnetic field on the axis.