发明公开
EP0443582A3 Color picture tube having an inline electron gun with an astigmatic prefocusing lens
失效
具有电子枪的彩色图像管带有一个非常优雅的镜头
- 专利标题： Color picture tube having an inline electron gun with an astigmatic prefocusing lens
- 专利标题（中）： 具有电子枪的彩色图像管带有一个非常优雅的镜头
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申请号： EP91102552.6申请日： 1991-02-21
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公开(公告)号： EP0443582A3公开(公告)日： 1992-02-05
- 发明人: New, David Arthur
- 申请人： RCA Thomson Licensing Corporation
- 申请人地址： 2 Independence Way Princeton New Jersey 08540 US
- 专利权人： RCA Thomson Licensing Corporation
- 当前专利权人： RCA Thomson Licensing Corporation
- 当前专利权人地址： 2 Independence Way Princeton New Jersey 08540 US
- 代理机构： von Bezold, Dieter, Dr.
- 优先权： US483487 19900222
- 主分类号： H01J29/62
- IPC分类号： H01J29/62 ; H01J29/50
摘要：
An improved color picture tube includes an inline electron gun (26) for generating and directing three inline electron beams (28) along coplanar beam paths toward a screen (22). The gun includes a plurality of electrodes (44,46, 48,50,52,56) which form a beam-forming region (L1), a prefocusing lens (L2), and a main focusing lens (L3) for the electron beams. The improvement resides within the prefocusing lens, which includes four active surfaces. At least one of the active surfaces has asymmetric prefocusing recesses formed therein.
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