KR0180663B1 - Device for convergence correction - Google Patents

Abstract

The present invention relates to a misconvergence correction device, wherein a winding order of a VCR correction coil wound on an E-shaped coma-free correction device installed to correct a VCR is changed, and the upper and lower VCR correction coils and the center portion of the VCR correction coils are changed. The VCR correction coils were separately configured, and a variable resistor for controlling the amount of current applied to the separated VCR correction coils was changed to correct the landing and the upper and lower distortion by changing the magnitude of the magnetic field generated in the VCR correction coils. This invention makes it easy to correct landings and distortions occurring on the production process and characteristic composition of the deflection yoke, so that it can be used for all deflection yokes.

Description

Miss Convergence Corrector

1 is a structural diagram showing a conventional misconvergence correction apparatus.

2 is a detailed circuit diagram of FIG.

3 is a structural diagram showing a misconvergence correction apparatus according to the present invention.

4 is a detailed circuit diagram of FIG.

5A and 5B are screen characteristic diagrams showing a misconvergence correction state according to FIG.

* Explanation of symbols for main parts of the drawings

10: E-shaped coma free correction device C1 ~ C6: VCR correction coil

PCS (V): PS coil (for vertical misconvergence correction)

V1, V2: Vertical Deflection Coil R1 ~ R4: Resistance

VR1, VR2: Variable resistor

The present invention relates to a misconvergence correction device, and more specifically, to a deflection yoke with an E-shaped coma-free correction device for correcting vertical green beam misconvergence (hereinafter referred to as 'VCR'), an E-shape. By changing the arrangement order of the VCR correction coils wound on the comma-free correction device, and adjusting the amount of current applied to each VCR correction coil, the misconvergence correction enables to simultaneously correct the VCR and landing and upper and lower distortion. Relates to a device.

In general, a landing or a landing error means that each of the electron beams R, G, and B scanned from the electron gun is not accurately scanned at each pixel on the screen, and is shifted from each pixel to the center of the screen or the edge of the screen. It is a misconvergence that is That is, it refers to narrow or widened misconvergence.

In addition, the upper and lower distortion (N / S Distortion) or the distortion error is a state in which the electron beam is scanned on the screen is out of the upper and lower sides of the screen, or is driven to the center of the screen and the beam is not scanned at the edge It means misconvergence. That is, it refers to the misconvergence of the barreled or pinned state. In addition, the VCR refers to a misconvergence in which a red beam and a blue beam are accurately scanned on the screen, whereas a green beam is not accurately scanned on each pixel of the screen and an error occurs in the vertical direction.

Conventionally, in order to correct the VCR, an E-shaped comapri correction device 10 is attached to the neck portion of the deflection yoke as shown in FIG. 1, and a VCR correction coil C1 is attached to the E-shaped coma-free correction device 10. By winding ~ C6) to form a six-pole magnetic field, the intensity of the magnetic field affecting the green beam of the electron beam is relatively much larger than the strength of the magnetic field affecting the red and blue beams. , VCR was corrected.

In more detail, in FIG. 1, an E-shaped comapri correction device 10 for correcting a VCR is formed on both sides of a neck of a deflection yoke, and each of the E-shaped coma free correction devices 10 includes a VCR correction coil. (C1 to C6) are wound.

Also, in FIG. 2, a PC coil (PCS (V)) connected to six VCR correction coils C1 to C6 generating a correction magnetic field for correcting a VCR and correcting vertical misconvergence, Vertical deflection coils V1 and V2 connected to PCS coils VS and V2 which generate a vertical deflection magnetic field in parallel with the vertical deflection coils V1 and V2. Is composed of a variable resistor VR1 and resistors R1 and R2 for adjusting the voltage applied to the circuit.

The operation will be described with reference to the configuration as described above.

In the above configuration, when a current is applied to the VCR correction coils C1 to C6, the E-shaped coma free correction device 10 is magnetized to generate a six-pole magnetic field. That is, the intensity of the magnetic field affecting the green beam formed in the center of the electron gun is relatively larger than the intensity of the magnetic field affecting the red and blue beams formed on the left and right sides of the electron gun, so that the VCR generated by the green beam is corrected.

However, in the above case, since the amount of current applied to the VCR correction coils C1 to C6 cannot be adjusted, a six-pole magnetic field having a constant magnitude is always generated in proportion to the amount of applied current. In addition, the VCR misconvergence can be corrected because only a six-pole magnetic field having a constant size always occurs, but there is a problem that it is impossible to correct landing or upper and lower distortion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to change the arrangement order of the VCR correction coils in order to correct the landing and the up and down distortion without changing the amount of VCR correction magnetic field. The present invention provides a misconvergence correction device in which a variable resistor for adjusting the amount of current applied to a VCR correction coil is provided.

A feature of the misconvergence correction apparatus according to the present invention for achieving the above object is to change the arrangement order of the vertical green beam misconvergence correction coil, and to install a variable resistor so as to adjust the upper and lower sides of the vertical green beam misconvergence correction coil. By controlling the amount of current applied to the side coil and the amount of current applied to the coil in the center part, the intensity of the magnetic field generated by the vertical green beam correction coil is changed to simultaneously correct vertical green beam misconvergence, landing and vertical distortion. It is in one way to do it.

Hereinafter, one preferred embodiment of the misconvergence correction apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a structural diagram showing a misconvergence correction apparatus according to the present invention, FIG. 4 is a detailed circuit diagram of FIG. 3, and FIGS. 5A and 5B are screen characteristic diagrams showing a misconvergence correction state according to FIG. .

First, as shown in FIG. 3, the configuration of FIG. 1 is the same, but the winding order of each VCR correction coil C1 to C6 is changed. That is, the VCR correction coils were wound in the order of C1, C3, C4, C6, C2, and C5.

4, the VCR correction coil is composed of C1, C3, C4, C6, C2, and C5, and resistors R3 and R4 are configured to determine a residual amount applied to the separated VCR correction coil. A variable resistor VR2 is configured between the split VCR correction coils to adjust the amount of current applied to the split VCR correction coils.

Referring to the circuit as described above the operation is as follows.

When a voltage is applied to the voltage input terminal (Y terminal), the amount of current applied to the VCR correction coils C1, C4, C6, C2, and C5 changes according to the adjustment of the variable resistor VR2. As a result, the magnitude of the correction magnetic field generated by the VCR correction coil also changes according to the change in the amount of current. At this time, since the total amount of current applied from the voltage input terminal (Y terminal) does not change, the VCR correction amount does not change.

As shown in FIG. 5, the change of the screen characteristics according to the changed magnetic field intensity is as shown in FIG. 5. The top and bottom distortions are barreled.

In addition, when the magnitude of the magnetic field generated in the VCR correction coils C2 and C5 becomes larger than the magnitude of the magnetic field or the basic magnetic field generated in the C1, C3, C4 and C6, the landing is narrowed and the upper and lower distortions are pinned.

As a result, the landing and the upper and lower distortion can be corrected by controlling the amount of current applied to the separated VCR correction coil to adjust the magnitude of the magnetic field generated by the VCR correction coil.

As described above, according to the misconvergence correction apparatus according to the present invention, by controlling the amount of current applied to the VCR correction coil to adjust the magnitude of the magnetic field generated by the VCR correction coil, landing and distortion distribution in the production process and characteristic adjustment There is an advantage that can be adjusted, and the correction of mis-landing generated by the characteristics of the cathode ray tube is easy.

Claims (1)

Change the arrangement order of the vertical green beam misconvergence correction coil and install a variable resistor to control the amount of current applied to the upper and lower coils and the amount of current applied to the coil in the center part of the vertical green beam misconvergence correction coil. A misconvergence correction device for correcting vertical green beam misconvergence, landing and vertical distortion simultaneously by varying the intensity of the magnetic field generated by the green beam correction coil.