| 摘要 |
PURPOSE:To minimize the level variation and to ease the mass-production, by separately positioning the sound recording gap of an exclusive sound recording head and the reproducing gap of an exclusive reproducing head on separated circular arcs in a prescribed range. CONSTITUTION:A sound recording gap 3 is installed on a circular arc 11 and a reproducing gap 5 is on another circular arc 12, and the arcs 11 and 12 are separate arcs, each having a radius of 1-6mm.. Moreover, the sound recording gap 3 is deviated by 0.2mm. in the opposite direction of the reproducing gap 5 from the contact point 14 of the common tangent 13 of the arcs 11 and 12 and the arc 11, and the reproducing gap 5 is deviated by 0.2mm. in the opposite direction of the sound recording gap 3 from the contact point 15 of the common tangent 13 and the arc 12, and the gaps 3 and 5 are arranged so that they are parallel with each other and face each other. Furthermore, the interval (d) between both gaps 3 and 5 is set to <=2.4mm.. |
