发明名称 |
North-south pincushion corrected deflection circuit. |
摘要 |
A field deflection amplifier (21) generates a field deflection current in a field deflection winding (Lv). An LC resonant circuit (22) is coupled to the deflection winding (Lv) and to an output switching amplifier (Q4). A control circuit (26) switches conductive states of the amplifier (21) at a line rate, to excite the LC resonant circuit (22) into providing a line rate correction current for the field deflection winding (Lv). The control circuit (26) varies the modulation envelope of the field deflection current at a field rate in a generally sawtooth manner to provide north-south pincushion correction. When used in conjunction with raster scanning in a square-planar picture tube (SP), the modulation envelope is nonlinearly waveshaped to take into account the aspherical nature of the picture tube faceplate.
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申请公布号 |
EP0308018(A1) |
申请公布日期 |
1989.03.22 |
申请号 |
EP19880201972 |
申请日期 |
1985.04.04 |
申请人 |
RCA LICENSING CORPORATION |
发明人 |
HAFERL, PETER EDUARD |
分类号 |
H04N3/23;G09G;H01J29/56;H04N;H04N3/233 |
主分类号 |
H04N3/23 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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