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    • 1. 发明申请
    • Lensless optical servo system for an optically assisted disk drive
    • 用于光辅助磁盘驱动器的无镜头光学伺服系统
    • US20050162993A1
    • 2005-07-28
    • US11025682
    • 2004-12-28
    • Stephen FarnsworthWerner SpaethKirk Cook
    • Stephen FarnsworthWerner SpaethKirk Cook
    • G11B5/596G11B7/00
    • G11B5/59677
    • A lensless optical servo system (100) has an unfocused light source (102) and patterned photodetectors (104, 106, 108). The unfocused light is reflected by the markings on an LS-120 disk (40) and the reflected light carries the pattern of the markings the considerable distance in its far-field to the photodetectors (104, 106, 108). The convolution of this light pattern and a mating geometric pattern (110, 112, 114) on the photodetectors (104, 106, 108) causes the photodetectors to generate signals representing the position of the track on the disk. According to a presently preferred embodiment, a laser diode (102) and three detectors (104, 106, 108) are formed on the same silicon substrate (101). Sinusoidal metalization (110, 112, 114) is applied to the detectors (104, 106, 108) in the radial direction. The period of the sinusoidal metalization is two times the tracking pitch of the disk radially and tangentially. The metalization on the first detector is approximately ninety degrees behind the metalization on the second detector and the metalization on the third detector is approximately ninety degrees ahead of the metalization on the second detector. Preferably, each detector (104, 106, 108) is provided with two sinusoidal patterns (110a, 110b, 112a, 112b, 114a, 114b), approximately one hundred eighty degrees out of phase with each other, and spaced apart in the tangential direction.
    • 无镜头光学伺服系统(100)具有未聚焦光源(102)和图案化光电检测器(104,106,108)。 未聚焦的光被LS-120盘(40)上的标记反射,并且反射光将其远场中的相当距离的标记的图案携带到光电检测器(104,106,108)。 这种光图案和在光电检测器(104,106,108)上的匹配几何图案(110,112,114)的卷积导致光电检测器产生表示盘上磁道位置的信号。 根据目前优选的实施例,激光二极管(102)和三个检测器(104,106,108)形成在同一硅衬底(101)上。 在径向上将正弦金属化(110,112,114)施加到检测器(104,106,108)。 正弦金属化的周期是径向和切向的盘的跟踪间距的两倍。 第一检测器上的金属化在第二检测器上的金属化之后大约九十度,并且第三检测器上的金属化比第二检测器上的金属化大约九十度。 优选地,每个检测器(104,106,108)被提供有彼此相差近似180度的两个正弦图案(110a,110b,112a,112b,114a,114b),以及 沿切线方向间隔开。