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DAT(Digital Audio Tape-recoder)即数字式音频磁带录音机是一种新型磁带录音机。根据记录方式,DAT可以有两种制式,一种称为R-DAT,另一种称为S-DAT。R-DAT采用类似磁带录像机那样的旋转磁头工作,故称旋转磁头方式。而S-DAT是采用固定磁头工作,因此被称为固定磁头方式。根据S-DAT的基本规格和特点,为达到规定的线记录密度,在一道的磁带位置上需要有20道磁迹,因此必须要求一个磁头有20道。这样,每道磁迹宽度只有65微米,迹间距离为15微米,该磁头的结构尺寸已超出了缝隙式磁头的加工极限,故必须采用薄膜技术来制作磁头。
DAT (Digital Audio Tape-recoder) digital audio tape recorder is a new type of tape recorder. According to the recording method, DAT can have two kinds of standard, one is called R-DAT, the other is called S-DAT. R-DAT uses a rotating head like a video tape recorder to work, so called rotary head mode. The S-DAT is a fixed head work, it is called fixed head mode. According to the basic specifications and characteristics of S-DAT, in order to achieve the prescribed linear recording density, 20 tracks are required in one tape position, and therefore, it is necessary to require 20 tracks for one head. Thus, each track width of only 65 microns, trace distance of 15 microns, the structure of the head size has exceeded the processing limit of the gap head, it is necessary to use film technology to make heads.