发明名称 |
FOCUS VOLTAGE GENERATOR AND FLYBACK TRANSFORMER |
摘要 |
PURPOSE:To easily implement focus adjustment implemented in response to a change in a picture size by adding a DC bias compensating a change in a lowermost point of a parabolic wave amplitude to a static focus voltage. CONSTITUTION:An earth side terminal 21 of a voltage division circuit being a component of a static focus voltage generating means 9 of a flyback transformer 20 is connected to a DC bias generating means 19. A DC bias generating means 19 is driven by a signal in response to a horizontal size of a picture from a horizontal size control means 15. Then a DC bias to compensate a change at a lowermost point caused by a change in a parabolic wave amplitude obtained from the DC bias generating means 19 is added to the static focus voltage. Then the static focus voltage with the DC bias added thereto and a parabolic wave voltage whose amplitude is adjusted by the parabolic wave amplitude adjustment means 13 are superimposed and the result is applied to a focus electrode 7 of a cathode ray tube 6. |
申请公布号 |
JPH04293364(A) |
申请公布日期 |
1992.10.16 |
申请号 |
JP19910057509 |
申请日期 |
1991.03.22 |
申请人 |
NANAO:KK |
发明人 |
MAEDA KAZUYA;HASHIMOTO NORIYUKI |
分类号 |
H01J29/58;H04N3/18;H04N3/26 |
主分类号 |
H01J29/58 |
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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