The Applications of a Liquid Crystal Panel for the 15 Gbyte Optical Disk Systems
The Applications of a Liquid Crystal Panel for the 15 Gbyte Optical Disk Systems
复制标题
液晶面板在15GB光盘系统中的应用
DOI：
10.1143/jjap.38.1744
复制
发表时间：
1999
影响因子：
1.5
通讯作者：
M. Iwasaki
中科院分区：
文献类型：
--
作者：
S. Ohtaki;N. Murao;M. Ogasawara;M. Iwasaki
我们研究了使用蓝色激光的下一代数字多功能光盘(DVD)，并研究了液晶面板在高密度光盘中的应用。液晶面板可以很容易地改变光束的光路长度，从而有可能抵消波前像差。首先，作者将液晶面板应用于倾斜伺服系统。与机械倾斜伺服系统相比，LC倾斜伺服系统有望更紧凑、更可靠。我们还开发了一种通过比较相邻磁道的串扰信号电平来感测磁盘倾斜量的系统。因此，实现了不需要任何额外传感器的倾斜伺服。液晶屏的另一个应用是球差补偿。通过模拟和实验证实，液晶屏对于校正盘片厚度误差是实际有用的，当使用蓝光激光器时，盘片厚度误差已被确定为更加严重。
We have studied the next-generation digital versatile disk (DVD) using a blue laser and investigated the application of a liquid crystal (LC) panel to the high-density disk. The LC panel can easily shift the optical path length of light beams making it possible to cancel out wavefront aberrations. First, the authors applied an LC panel to a tilt servo system. Compared with a mechanical tilt servo system, the LC tilt servo is expected to be more compact and reliable. We also developed a system for sensing the amount of disk tilt by comparing the signal levels of crosstalk from adjacent tracks. Consequently a tilt servo without any extra sensors was achieved. Another application of the LC panel is for the compensation of spherical aberrations. It was confirmed, by simulations and experiments, that the LC panel was practically useful for correcting disk thickness error which has been determined to become more serious when a blue laser was used.