Magnetic recording medium having a dimensional variation
摘要
說明書
Next, the reproduced signal was captured with a span (SPAN) of 0 to 20 MHz (resolution band width=100 kHz, VBW=30 kHz) by a spectrum analyzer. Next, the peak of the captured spectrum was referred as a signal amount S, the floor noise excluding the peak was integrated to obtain a noise amount N, and the ratio S/N between the signal amount S and the noise amount N was determined as a signal-to-noise ratio (SNR). Next, the determined SNR was converted to a relative value (dB) based on the SNR according to Comparative Example 1 as a reference medium. Next, the SNR (dB) determined in the way described above was used to determine whether the electromagnetic conversion characteristics were favorable or not in the following way.
Favorable: The SNR of the magnetic tape is equal to or more than the SNR (=0 (dB)) of the evaluation reference sample (Comparative Example 1).
Defective: The SNR of the magnetic tape is less than the SNR (=0 (dB)) of the evaluation reference sample (Comparative Example 1).
(Evaluation of Winding Deviation)
First, the cartridge sample was prepared after the above-mentioned “determination of the amount of change in tape width”. Next, the reel with the tape wound thereon was taken out of the cartridge sample, and the end face of the wound tape was visually observed. Note that the reel has flanges, at least one flange is transparent or semi-transparent, and the wound state of the tape inside can be observed through the flange.
