JPH0743931Y2 - Deflection yoke - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke for a cathode ray tube used in, for example, a small video camera.

[0002]

2. Description of the Related Art The distance from the deflection center of a cathode ray tube to the fluorescent screen is not constant, but is short at the center of the screen and becomes longer toward the periphery. Therefore, even if the deflection angle per unit time is constant, the scanning speed of the electron beam on the phosphor screen is not constant, and the scanning speed is slow at the center of the screen and becomes higher toward the periphery.

In order to correct this, conventionally, a horizontal linearity correction device is attached between the deflection coil and the electron beam focusing magnet so that the electron beam scanning speed of the cathode ray tube becomes constant over the entire screen. ing.

FIG. 2 shows an example of this. 1 is a cathode ray tube, 2 is an electron gun, 3 is a deflection coil, 4 is a horizontal linearity correction device, 5 is a centering adjustment magnet, and 6 is an electron beam focusing device. It is a magnet.

[0005]

In the structure of the deflection yoke as described above, the following problems have occurred in recent years as the image quality of the cathode ray tube has improved. That is, as a problem related to the deflection yoke, in this method, although the electron beam scanning speed of the cathode ray tube is constant over the entire screen, it is possible to improve the focus characteristic (resolution) which is the most important characteristic of the cathode ray tube. Can not.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. In a magnetic field focusing type cathode ray tube, a horizontal linearity correcting device is attached to the electron gun side of the electron beam focusing magnet. Thus, an electron beam focusing magnet is brought close to the phosphor screen, and a substantial reduction in magnification is achieved without increasing the power consumption of the deflection coil, thereby providing a deflection yoke capable of improving focus characteristics.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a cathode ray tube, 2 is an electron gun, 3 is a deflection coil, 4 is a horizontal linearity correction device, 5 is a centering adjustment magnet, and 6 is an electron beam focusing magnet. Since the horizontal linearity correction device 4 is attached to the electron gun side 2, the electron beam focusing magnet 6 is provided.
Has approached the fluorescent screen and has been substantially reduced in magnification.

[0009]

As described above, in the deflection yoke of the present invention, the horizontal linearity correction device is attached to the electron gun side of the electron beam focusing magnet, so that power consumption of the deflection coil is not increased. To lower the magnification ratio,
A deflection yoke that can improve the resolution can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a deflection yoke according to the present invention.

FIG. 2 is a cross-sectional view showing an example of a conventional deflection yoke.

[Explanation of symbols]

 1 Cathode Ray Tube 2 Electron Gun 3 Deflection Coil 4 Horizontal Linearity Correction Device 5 Centering Adjustment Magnet 6 Electron Beam Focusing Magnet

Claims (1)

[Scope of utility model registration request] 1. A deflection yoke for a magnetic field focusing type cathode ray tube, wherein a horizontal linearity correction device is attached to the electron gun side of the electron beam focusing magnet.