Cathod ray tube device

Abstract

A horizontal deflection coil is formed by winding conductive wires. A wire density of the conductive wires in a first portion of the horizontal deflection coil, which is defined in a predetermined angle range centering on a winding angle, and which is set to be theta1 with respect to a horizontal direction as 0 DEG in an electron-gun-side region, theta2 with respect to a horizontal direction as 0 degree in a middle region, and theta3 with respect to a horizontal direction as 0 degree in a screen-side region on a cross section perpendicular to a tube axis, is smaller than a wire density of the conductive wires in a portion of the horizontal deflection coil other than the first portion. The winding angles theta1, theta2, and theta3 in the first portion satisfy theta1>=theta2>=theta3. With this configuration, it is possible to provide a cathode-ray tube device in which, without an additional correcting coil or a specific correcting circuit for generating a correcting current, the dynamic convergence adjustment is facilitated, and an excellent convergence characteristic is achieved.

Description

technical field [0001] The present invention relates to a cathode ray tube device. In particular, it relates to a cathode ray tube device having improved convergence characteristics of a deflection yoke. Background technique [0002] As the OS of personal computers, with the spread of multi-screen display environments such as Microsoft Windows, etc., in cathode ray tube devices used in computer monitors, high resolution at the periphery of the screen has become an important technology topic. [0003] As one of the factors determining the resolution, there may be mentioned convergence characteristics representing aberration errors (hereinafter referred to as "misconvergence") of electron beams for blue, green, and red light emission on the screen surface. [0004] In the cathode ray tube device for display, the misconvergence on the screen surface is adjusted to about 0.25 mm in the manufacturing process. In this case, especially at the corners of the screen surface, it is...

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Problems solved by technology

[0008] However, according to the above-mentioned prior art, there is a problem that it is necessary to additionally install the dedicated correction coils 23 and 24 only for the purpose of correcting the HGB.

Moreover, there is also the need to add the above-mentioned correction current generating current in the auxiliary circuit in the deflection yoke.

Due to the need for such additional installations, the current loss increases, the manufacturing cost increases significantly, and the design burden of deflection yokes, cathode ray tubes, etc. also increases.

[0009] Furthermore, the amount of HGB improved by the above effects depends on the amount of current flowing in the circuit. On the other hand, since the increase in horizontal deflection power and circuit loss must be suppressed to a minimum, the amount of improvement in HGB cannot be said to be very large. full

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