| 摘要 |
<p>Magnetic reproducer which uses a magnetic sheet having four circular coaxial magnetic tracks for recording visible information independently divided into four divisions on the front surface thereof and four circular coaxial magnetic tracks for recording voice information relative to the visible information on the back surface thereof. This magnetic reproducer consists of a plurality of preamplifiers (PA) each having a photodetector (PT) and connected respectively to four reproducing heads (H) moving on the respective magnetic tracks to be movable integrally with the respective heads (H), sliding contacts (SR) for connecting these preamplifiers (PA) to one main amplifier (MA), a plurality of light-emitting elements (LED) energized upon operation of four reproduction switches (TS) installed corresponding to the respective items of visible information to face the respective photodetectors (PT), and four energization inhibiting circuits connected to the respective light-emitting elements (LED) and connected to each other. When only the light-emitting element (LED) corresponding to the initially operated reproduction switch (TS) of the four reproduction switches (TS) is energized to allow the photodetector (PT) corresponding thereto to receive the light therefrom, the preamplifier (PA) corresponding thereto is operated. </p> |
