OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE

• Main Authors: MINOURA KAZUO, AOKI AKIO, SHIKICHI SATOSHI
• Format: Patent
• Language: English
• Published: 04.04.1987
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

PURPOSE:To prevent generation of mechanical vibration of the entire device by limiting the power fed to a drive means at the inversion of low-speed movement to eliminate the speed fluctuation substantially at the inversion of an optical information recording medium. CONSTITUTION:An inversion control signal is outputted from a changeover control circuit 11 at a point of time t''0 when a light shield plate 6 provided to a shuttle 2 shuts the light path of a photointerruptor 7, an analog switch 12 is operated while receiving the said signal and a voltage of opposite polarity is fed to a non-inverting terminal of an operational amplifier 15. Thus, the operational amplifier 15 is going to output a maximum output drive voltage +EA with an opposite polarity, but since the relation of +EA>EA.l exists, a diode 18 is conductive, resulting in that a drive voltage +EA.l is applied to a motor 5. Thus, the motor 5 is reversed between points of time t''0 and t''1, and a DC voltage corresponding to the drive speed and direction is outputted from a tachogenerator 8 thereby decreasing the input potential difference of the operational amplifier 15.