发明公开
EP0805473A3 Color picture tube with reduced dynamic focus voltage
失效
Farbbildröhremit verringerter dynamischer Fokussierspannung
- 专利标题： Color picture tube with reduced dynamic focus voltage
- 专利标题（中）： Farbbildröhremit verringerter dynamischer Fokussierspannung
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申请号： EP97111760申请日： 1994-10-31
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公开(公告)号： EP0805473A3公开(公告)日： 1998-07-15
- 发明人: TOUJOU TSUTOMU , KATO SHINICHI , SHIRAI SHOUJI
- 申请人： HITACHI LTD
- 专利权人： HITACHI LTD
- 当前专利权人： HITACHI LTD
- 优先权： JP27926593 1993-11-09
- 主分类号： H01J29/48
- IPC分类号： H01J29/48 ; H01J29/50 ; H01J29/62
摘要：
In an in-line color picture tube, the length L of the focussing electrode (12) constituting the main lens of the electron gun is at least two times of the diameter D of the main lens and the focussing electrode (12) includes a first electrode (121), a second electrode (122), and a third electrode (123). The electron gun has a correction electron for forming a quadrupole lens in at least one of the opposing ends of the first electrode (121) and the second electrode (122) and the opposing ends of the second electrode (122) and the third electrode (123) and a voltage which varies in synchronization with the deflection current is applied to the fist electrode (121) and the third electrode (123), respectively.
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