发明名称 |
Liquid crystal driver and optical head for tilt correction |
摘要 |
Tilt which is inclination of a normal of optical disk relative to optical axis of optical head is corrected with a liquid crystal element. In a driver for the liquid crystal element, a periodic waveform generator generates periodic waveform and an inverting element inverts the periodic waveform. The periodic waveform and the inverted waveform are connected to two ends of a potential divider which provides partial voltages. The periodic waveform is connected to a common electrode of the liquid crystal element, and the partial voltages of the potential divider are connected to electrodes opposing the common electrode. A structure of a driver circuit for each direction is simple. Tilt in a plurality of directions can be performed independently of each other. Spherical aberration is also corrected. When the liquid crystal element is mounted to a fixed component, deterioration due to jitters is reduced.
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申请公布号 |
US6661415(B1) |
申请公布日期 |
2003.12.09 |
申请号 |
US20000598972 |
申请日期 |
2000.06.22 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
YASUDA KATSUHIKO;WADA HIDENORI;OGATA DAISUKE;WAKABAYASHI KANJI;HOTTA NAOYA;IKAWA YOSHIHIRO;KANDA YOSHIHIRO;INATA MASAHIRO |
分类号 |
G09G3/36;G11B7/095;(IPC1-7):G09G5/00 |
主分类号 |
G09G3/36 |
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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