一、前言近来,磁带记录密度有了惊人的发展,录像磁带单位时间的面记录密度已达到约0.5m~2。为达到高记录密度,曾试图通过记录的短波长化,窄磁道化以及磁带的薄型化来实现,但这些方法都会导致S/N(信噪比)的降低。因此,从提高图像质量的观点看,希望提高磁带的S/N,即要实现高记录密度,还必须同时考虑提高S/N。要提高S/N,当然需要改善包括磁头在内的机器噪声,但在磁带方面,通过磁粉微粒 I. INTRODUCTION Recently, tape recording density has witnessed astonishing development. The recording density per unit time of video tape has reached about 0.5m ~ 2. In order to achieve high recording densities, attempts have been made to achieve short wavelength growth, narrower tracking and thinner tapes, but these methods all lead to a decrease in S / N (signal to noise ratio). Therefore, from the standpoint of improving the image quality, in order to increase the S / N of the tape, that is, to achieve a high recording density, S / N must also be considered for improvement. To improve the S / N, of course, need to improve the machine noise, including the head, but in terms of tape, through the magnetic particles