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本文报导了磁盘系统中磁头定位的一种新的光学方法。为了提高磁头定位的精度,研究过几种不使用伺服盘的磁头定位方法,但由于记录在同一数据面上的磁头定位信号与数据信号之间产生干扰,这些方法至今都不成功。在本文说明的新方法中,磁头能用一个光学检测的位置信号定位在磁盘盘面上,同时又不扰乱磁盘系统的运行。 本文研究了一种磁盘与磁头的独特结构。它在铝基片的阳极氧化层上着色再在其上面形成一种磁膜,从而构成描述数据磁道位置的光学图形。在Winchester型铁氧体磁头中间轨道的一个孔中埋置着三条光纤维,盘面上的光学图形由这三条光纤维读出。 用光学方法从旋转的磁盘上检测出一个稳定的位置信号,用这个信号组成一个简单的伺服回路,使磁头能够以±3μm精度定位。曾经发现潜在的精度为±0.7μm。
This article reports a new optical method of magnetic head positioning in disk systems. In order to improve the accuracy of head positioning, several head positioning methods without servo disk have been studied. However, these methods have been unsuccessful until now due to interference between head positioning signals and data signals recorded on the same data plane. In the new method described here, the head can be positioned on the disk surface with an optically detected position signal without disrupting the operation of the disk system. This paper studies a unique structure of a magnetic disk and head. It is colored on the anodized aluminum substrate to form a magnetic film thereon to form an optical pattern that describes the position of the data tracks. Three optical fibers are embedded in a hole in the middle track of a Winchester-type ferrite head and optical patterns on the optical disc are read by the three optical fibers. Optically, a stable position signal is detected from the rotating disk, using this signal to form a simple servo loop that enables the head to be positioned with ± 3μm accuracy. Potential accuracy of ± 0.7 μm has been found.