Method and apparatus for demagnetizing color CRT

A degaussing device for color CRTs, comprising:

• degaussing-current passing means for passing, through a degaussing coil of a color CRT, a first damped oscillation current which starts with a specified polarity and swings both positively and negatively, and passing a second damped oscillation current opposite in polarity to the first damped oscillation current through the degaussing coil of the color CRT;
• and
• timing control means for making the first damped oscillation current and the second damped oscillation current sequentially passed in a vertical retrace period.

A degaussing method for color CRTs, comprising a step of sequentially performing following current passages (A) and (B) in two vertical retrace periods of a color CRT, the two vertical retrace periods being adjacent to each other on the time base:

• (A) passing, through a degaussing coil of the color CRT, a first damped oscillation current which starts with a specified polarity and which swings both positively and negatively;
• and
• (B) passing, through the degaussing coil of the color CRT, a second damped oscillation current opposite in polarity to the first damped oscillation current.

A degaussing method for color CRTs, comprising a step of sequentially performing following current passages (A) and (B) within a vertical retrace period of a color CRT:

• (A) passing, through a degaussing coil of the color CRT, a first damped oscillation current which starts with a specified polarity and which swings both positively and negatively;
• and
• (B) passing, through the degaussing coil of the color CRT, a second damped oscillation current opposite in polarity to the first damped oscillation current.