JPH1050234A - Television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mechanically adjust the gun center correction for an electron beam, by fitting a coil for correcting the gun center to the neck part of a cathode-ray tube, and flowing a D.C. current in the coil. SOLUTION: A coil 2 for correcting a gun center is independently fitted to the neck part of a cathode-ray tube(CRT) 1. A D.C. current flows in the coil 2 for correcting a gun center via a resistor 6 by adding a variable type D.C. current source 5 in accordance with the deviation degree of the gun center, and this floating of the D.C. current in the coil 2 generates a magnetic field, and this electric field can change the direction of an electron beam radiated from the electron gun 4 of the CRT 1. For instance, the coil for correcting the gun center can be fitted so that the gun center can be corrected right and left, and switching a switch can correct the direction of the electron beam in right or left optionally. Moreover, the neck part space of the CRT 1 can be saved by using the coil 2 for correcting the gun center and a VM coil 3 in common.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver (International Patent Classification H04N 5/45) having a gun center correction control of an electron beam in a CRT.

[0002]

2. Description of the Related Art An electron beam emitted from an electron gun of a CRT is originally incorporated so as to coincide with the center of a shadow mask. Becomes Conventional C
The method of gun center correction of the electron beam in RT is
Using two superimposed purity magnets attached to the neck of the CRT, the strength of the magnetic field is changed by manually opening and rotating the two magnets to change the strength of the magnetic field.
It is common to correct the electron beam emitted from the electron gun so that it coincides with the center of the shadow mask,
Recently, a gun center can be corrected by attaching a winding coil to the neck of a CRT and passing a DC current through the winding coil. For example, a technique described in Japanese Patent Application Laid-Open No. 5-292516 is known.

[0003]

As described above, the gun center correction of the electron beam in the CRT is performed by the purity magnet attached to the neck of the CRT.
To perform this correction, the back cover of the television receiver is removed, and the purity magnet is manually corrected for gun center while the television vision receiver is energized.

Therefore, when performing gun center correction, the back cover of the television receiver must be removed. In addition, when the CRT is energized, a high voltage is generated at the neck of the CRT to emit an electron beam, and there is a risk of electric shock.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a television receiver according to the present invention aims at mechanically adjusting a gun center correction of an electron beam in a CRT from manual adjustment, and a purity magnet. Instead, a gun center correction winding coil is attached to the neck portion of the CRT, and a DC current is applied to the winding coil to correct the gun center.

Further, in order to save space in the CRT neck portion, a VM coil and a gun center correction winding coil are independently mounted on one socket.

Further, the winding coil for gun center correction is V
By integrating the M coil with a DC current and superimposing a DC current on the VM coil and controlling the amount of the DC current with a microcomputer, it becomes possible to automatically control the gun center correction which has been manually performed conventionally.

According to the present invention, since it is possible to control gun center correction without removing the back cover of the television receiver, a television having a shortened adjustment time and an improved service in the market. Provide a receiver.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a television receiver according to a first aspect of the present invention, a winding coil for gun center correction is independently attached to a neck portion of a CRT, and a direct current is applied to the winding coil. The correction of the gun center of the electron beam emitted from the electron gun of the CRT can be performed in one direction, left or right, or up and down. However, the mechanical adjustment can be performed by flowing a DC current through the winding coil.

Next, the television receiver according to the second aspect of the present invention corrects the gun center in the left and right or up and down directions by passing positive and negative DC currents through the winding coil for gun center correction. It is possible to realize the correction control of the gun center in the left and right or up and down directions by supplying positive and negative DC currents, instead of the correction control in only one direction so far.

Next, a television receiver according to a third aspect of the present invention is a television receiver in which a VM coil and a gun center correction winding coil are separately mounted.
It is wound separately around the socket around which the VM coil is wound, and the space of the neck can be saved.

Next, in the television receiver according to the fourth aspect of the present invention, the gun center correction winding coil is shared with the VM coil, and further space saving can be achieved as compared with the third aspect. VM
By superimposing a DC current on the VM coil without impairing the function of the coil, it is possible to control the gun center correction.

Next, the television receiver according to claim 5 of the present invention mechanically performs the gun center correction control.
The amount of DC current superimposed on the VM coil can be controlled by the microcomputer, and the amount of DC correction superimposed on the VM coil determines the correction amount of the gun center. Center correction can be controlled.

Next, a television receiver according to a sixth aspect of the present invention reads information on landing on a CRT screen, detects a shift amount of the gun center by a detection circuit, and corrects the shift amount. The amount of DC current and its polarity are controlled by a microcomputer, and the amount of deviation of the gun center can be quantitatively detected by using a camera, so that automatic control of gun center correction becomes possible.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. Note that the same reference numerals are used for the same components in the embodiments, and description thereof will be omitted.

(Embodiment 1) FIG. 1 is a circuit configuration diagram of a television receiver having a gun center correction control according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 1 denotes a CRT, 2 denotes a winding coil for correcting a gun center, 3 denotes a VM coil, 4 denotes an electron gun for emitting an electron beam, and 5 denotes a control resistor of a direct current for correcting a gun center. , 6 are variable DC power supplies, 7 is a VM control circuit, and 7 is an AC power supply.

Depending on the degree of deviation of the gun center, a DC current flows through the coil 6 for gun center correction via the resistor 6 by applying the variable DC power supply 5. When a direct current flows through the coil 2, a magnetic field is generated. This magnetic field makes it possible to change the direction of the electron beam emitted from the electron gun 4 of the CRT 1.

(Embodiment 2) FIG. 2 is a circuit diagram of a television receiver having a gun center correction control according to Embodiment 2 of the present invention.

In FIG. 2, reference numerals 9 and 10 denote switches for switching the polarity of the DC current flowing through the winding coil for gun center correction. By switching the polarity of the DC current flowing through the gun center correction winding coil 2, the gun center can be corrected in two directions, left, right, up, and down, depending on how the primary winding coil is mounted. For example, by mounting the coil coil 2 for gun center correction so that it can be corrected to the left and right, and switching between (a) and (b) with the switches 9 and 10, the direction of the electron beam can be corrected to either the left or the right. .

(Embodiment 3) FIG. 3 is a circuit configuration diagram of a television receiver having a gun center correction control according to Embodiment 3 of the present invention.

In FIG. 3, reference numeral 11 denotes a socket for winding a coil. The coil 2 for the gun center correction and the VM coil 3 which are separately attached to the neck portion of the CRT 1 are wound separately around the same socket 11, though separately, so that the space for the neck portion is saved. Can be achieved.

(Embodiment 4) FIG. 4 is a circuit diagram of a television receiver having a gun center correction control according to Embodiment 4 of the present invention.

In FIG. 4, by sharing the gun center correction winding coil 2 with the VM coil 3, the neck portion of the CRT 1 can be further saved, and the variable DC power supply 6 is superimposed on the AC power supply 8. The DC current is superimposed on the AC current by the variable DC power supply 6 via the resistor 6. Further, via the VM control circuit 7, an AC current for VM control and a DC current for gun center correction flow through the VM coil 3, and control of gun center correction can be performed without impairing the function of the VM.

(Embodiment 5) FIG. 5 is a circuit diagram of a television receiver having a gun center correction control according to Embodiment 5 of the present invention.

In FIG. 5, reference numeral 12 denotes a microcomputer for controlling a DC power supply for gun center correction.

By controlling the DC power supply 6 for gun center correction by the microcomputer 12, the amount of DC current flowing through the VM coil can be controlled, and the control of gun center correction can be performed mechanically.

(Embodiment 6) FIG. 6 is a circuit diagram of a television receiver having a gun center correction control according to Embodiment 6 of the present invention.

In FIG. 5, reference numeral 13 denotes a circuit for detecting a shift amount for gun center correction, and reference numeral 14 denotes a CR.
This is a camera for capturing the T screen.

The landing state of the CRT screen is read by the camera 14, and the information is used to detect how much the gun center is displaced in which direction by the shift amount detection circuit 13, and the information is passed to the microcomputer. The microcomputer controls the DC power supply to the winding coil 2 for gun center correction and the switches 9 and 10 based on the information, so that the gun center correction can be automated.

[0031]

As described above, according to the television receiver of the present invention, the winding coil for gun center correction is attached to the neck of the CRT, and a DC current is applied to the winding coil to quantitatively determine the winding. Gun center correction becomes possible. In addition, by changing the polarity of the current flowing through the winding coil, control in two directions becomes possible. Furthermore, since the control of the gun center correction can be performed quantitatively, control by the microcomputer is possible, and the mechanical adjustment can be performed from the manual adjustment by the conventional purity magnet, so that the television that enables efficient gun center correction control can be performed. The receiver can provide it.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a television receiver having a gun center correction control according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a television receiver having a gun center correction control according to a second embodiment of the present invention.

FIG. 3 is a circuit configuration diagram of a television receiver having a gun center correction control according to a third embodiment of the present invention.

FIG. 4 is a circuit configuration diagram of a television receiver having a gun center correction control according to a fourth embodiment of the present invention.

FIG. 5 is a circuit configuration diagram of a television receiver having a gun center correction control according to a fifth embodiment of the present invention.

FIG. 6 is a circuit configuration diagram of a television receiver having a gun center correction control according to a sixth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CRT 2 Winding coil 3 VM coil 4 Electron gun 5 Resistance 6 Variable DC power supply 7 VM control circuit 8 AC power supply 9, 10 switch 11 Socket 12 Microcomputer 13 Displacement detection circuit 14 Camera

Claims (6)

[Claims] 1. A coil coil for gun center correction is independently attached to a neck portion of a cathode ray tube (hereinafter, referred to as CRT), and a positive DC current is applied to the coil to obtain a CRT.
A television receiver for correcting a gun center of an electron beam emitted from an RT electron gun in one direction. 2. The television receiver according to claim 1, wherein a positive / negative DC current is superimposed on the winding coil for gun center correction to correct the gun center in the left / right or up / down direction. 3. A method in which a speed modulation coil (hereinafter referred to as a VM coil) and a gun center correction winding coil are separately mounted, respectively, and respectively wound around a socket around which the VM coil is wound. The television receiver according to claim 2, wherein: 4. The television receiver according to claim 3, wherein the gun center correction winding coil is shared with a VM coil to save space. 5. The television receiver according to claim 3, wherein the microcomputer controls the amount of direct current superimposed on the VM coil to mechanically perform the gun center correction control. 6. A configuration in which a landing state of a CRT screen is read by a camera, a shift amount is detected by a detection circuit, and a DC current amount necessary for correcting the shift amount is controlled by a microcomputer. 4. The television receiver according to 4.