Color cathode ray tube apparatus

A color cathode ray tube apparatus, comprising:

• an electron gun assembly including a generating section for generating three electron beams arranged in a line, first and second electrodes which oppose each other and through which the three electron beams pass, a capacitance being formed between said first and second electrodes;
• deflecting means for horizontally and vertically deflecting the three electron beams emitted from said electron gun assembly;
• a target on which the deflected electron beams are landed and which generates light rays in response to landing;
• an electric resistor arranged along said first and second electrodes and connected to said first electrode;
• first applying means for applying a first voltage to said second electrode, the first voltage being obtained by superposing a first variable voltage changed in accordance with a deflection amount of the electron beams deflected by said deflecting means on a predetermined first DC voltage;
• and
• second applying means for applying a second DC voltage to said first electrode through said resistor, said second applying means substantially applying a second voltage which corresponds to the first variable voltage induced from said second electrode through the capacitance between said first and second electrodes on the second DC voltage and is obtained by superposing a second variable voltage on the second DC voltage,
• wherein electron lens means for focusing the electron beams on said target is formed by said first and second electrodes, and a focusing lens power of said electron lens is changed in accordance with changes in the first and second variable voltages synchronized with deflection of the electron beams, thereby changing focusing states of the electron beams,
• said lens means constituted by at least a first electron lens and a second electron lens formed closer to said phosphor screen than said first electron lens, a lens power of said first electron lens is changed in synchronism with at least a horizontal deflection amount of the electron beams, and
• said first and second electrodes have almost equal voltages when the electron beams is directed to a center of said phosphor screen, and when the electron beams are deflected to a peripheral portion of said phosphor screen, a difference between the voltages of said first and second electrodes occurs to cause said second electron lens to work.