CRT

Abstract

There is provided a cathode-ray tube apparatus. Its main lens comprises: a dynamic focus electrode G6, a first auxiliary electrode GM1, a second auxiliary electrode GM2, and a positive electrode G7, which are sequentially arranged in a traveling direction Z of an electron beam. A sub lens, which is formed on a cathode side K of the main lens, comprises a third grid G3, a fourth grid G4, and a fifth grid G5. The first auxiliary electrode GM1 is connected with the fourth grid G4, and connected with a voltage supply terminal R1-1 on a resistor R1 adjacent to the fourth grid G4. A fixed focus voltage Vf1 is applied to the third and fifth grids arranged on both sides of the fourth grid G4.

Description

technical field [0001] The present invention relates to a cathode ray tube device, and more particularly to a cathode ray tube equipped with an electron gun member for dynamic astigmatism compensation. Background technique [0002] A color cathode ray tube device generally includes: an inline electron gun component that emits three electron beams; a deflection coil that generates a deflection magnetic field to deflect the electron beams emitted by the electron gun component, thereby scanning horizontally and vertically on the fluorescent screen. The deflection yoke generates a pincushion-shaped horizontal deflection magnetic field and a barrel-shaped vertical deflection magnetic field, thereby forming a non-uniform magnetic field. [0003] The electron beam passing through this non-uniform magnetic field is affected by deflection aberration, that is, astigmatism included in the deflection magnetic field. Therefore, the beam spot of the electron beams reaching the peripheral...

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Problems solved by technology

[0012] However, this structure needs to additionally provide the second auxiliary electrode G6 to the electron gun component, thereby increasing the total number of electrodes constituting the electron gun component, causing an increase in cost.

In addition, the number of electron lenses formed in the electron gun assembly increases, thus easily causing abnormalities in the trajectory of the electron beams

[0013] As described above, according to the structure of the electron gun structure of the prior art, the AC component in the dynamic focus voltage is superimposed on the voltage of the adjacent electrodes, and an undesired lens action is produced on the electron lens formed by these electrodes, thereby deviating to the peripheral portion of the fluorescent screen Spot distortion of the electron beam is difficult to adequately compensate for

[0014] In addition, according to the electron gun component of the prior art, the voltage obtained by dividing the anode voltage with a resistor is provided to the auxiliary electrode, and when there are more than two auxiliary electrodes arranged close to each other, the voltage supply terminal of the resistor is close to the configuration, which is not conducive to withstand voltage

[0015] Furthermore, in order to solve the problem of poor withstand voltage performance, in addition to a plurality of first auxiliary electrodes arranged close to each other, second auxiliary electrodes are additionally arranged at positions far away from them, and one electrode of the first auxiliary electrodes is connected to the second auxiliary electrode. electrical connection, and at the same time, a corresponding voltage supply terminal is provided on the resistor close to the second auxiliary electrode. In this case, the number of electrodes constituting the electron gun component is increased, thereby increasing the cost, and the number of electron lenses formed in the electron gun component also increases, and thus prone to beam trajectory anomalies

[0016] In this way, the focusing characteristics deteriorate over the entire phosphor screen area, making it difficult to obtain a beam spot of good shape

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