| 摘要 |
<p>PURPOSE:To obtain a tape tension control system superior in responsibility by controlling an S-reel motor with a bit of error information which is a mixture of a tension error and a speed error corresponding to a tape moving speed and a rotation period of a T-reel. CONSTITUTION:The tape speed V is calculated by detecting a rotation roller diameter R1 and a rotation roller period T1 with an S-motor speed reference generator 18. Moreover, a T-reel diameter Rt is calculated, while an S-reel diameter Rs is calculated, so that an S-motor speed reference Tsref is calculated by using the S-reel diameter Rs and the tape speed V. In a 3rd differential amplifier 19, a difference between the S-reel speed reference Tsref and an S-reel period Ts obtained an S-reel period detector 16 is amplified to be outputted as a bit of speed error information Es. On the other hand, a bit of tension error information Ef is outputted from a 2nd differential amplifier 11, and these bits of information Es and Ef are mixed by a mixer 20, and hence a bit of S-motor error information E is outputted to an S-motor driving circuit 13. By this method, the tape tension control system superior in responsibility can be constituted.</p> |
