公开(公告)号：US06836451B1

公开(公告)日：2004-12-28

申请号：US09591930

申请日：2000-06-12

Applicant: Stephen W. Farnsworth ,  Werner Spaeth ,  Kirk Cook

Inventor： Stephen W. Farnsworth ,  Werner Spaeth ,  Kirk Cook

IPC: G11B700

CPC classification number: G11B5/59677

Abstract: A lensless optical servo system has an unfocused light source and patterned photodetectors. The unfocused light is reflected by markings on a rotating disk and the reflected light carriers the pattern of the markings to the photodetectors. The convolution of this light pattern and a mating geometric pattern on the photodetectors causes the photodetectors to generate signals representing the position of the track on the disk. In one embodiment, a laser diode and three detectors are formed on the same silicon substrate. Sinusoidal metalization is applied to the detectors in the radial direction. The period of the sinusoidal metalization is two times the tracking pitch of the disk. 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.

Abstract translation: 无镜头光学伺服系统具有未聚焦的光源和图案化的光电检测器。 未聚焦的光被旋转盘上的标记反射，并且反射的光将标记的图案传送到光电检测器。 这种光图案的卷积和光电探测器上的匹配几何图案使得光电检测器产生表示磁盘在磁盘上的位置的信号。 在一个实施例中，激光二极管和三个检测器形成在同一硅衬底上。 在径向上将正弦金属化施加到检测器。 正弦金属化的周期是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。

公开(公告)号：US06747257B1

公开(公告)日：2004-06-08

申请号：US09569096

申请日：2000-05-10

Applicant: Stephen W. Farnsworth ,  Kirk Cook

Inventor： Stephen W. Farnsworth ,  Kirk Cook

IPC: G02B2740

CPC classification number: G11B7/123 ,  G11B5/016 ,  G11B5/59677 ,  G11B7/22

Abstract: A monolithic optical pickup has all passive optical elements aligned during fabrication, thereby requiring no alignment during the assembly of a system utilizing it. Its supporting structure is the monolithic passive device itself. A single surface incorporates all the functions of an optical pickup system including a focusing element, image creation apertures and stops, scattering/reflection reduction, and return path apertures and optics. The elements are formed from a metalized layer which is applied lithographically. Placing the apertures and stops on the principal plane of the focussing element allows for the image size to be precisely controlled by the image distance. The monolithic optical pickup is well suited for use with multiple detector elements. Alternate embodiments of the invention may omit some of the optical system elements.

Abstract translation: 单片光学拾取器在制造期间对准所有无源光学元件，从而在利用其的系统的组装期间不需要对准。 其支撑结构是单片无源器件本身。 单个表面包括包括聚焦元件，图像创建孔和停止点，散射/反射减少和返回路径孔径和光学器件的光学拾取系统的所有功能。 这些元件由光刻的金属化层形成。 将孔和止动件放置在聚焦元件的主平面上允许由图像距离精确地控制图像尺寸。 单片光学拾取器非常适用于多个检测器元件。 本发明的替代实施例可以省略一些光学系统元件。