Title:
PORTABLE MAGNETIC RECORDING AND REPRODUCING DEVICE
Document Type and Number:
Japanese Patent JPS6055586
Kind Code:
A
Abstract:
PURPOSE:To attain continuous recording for a long time without dicontinuing shooting hitherto shot even in case the displacement of battery is needed by storing plural batteries to switch a using battery to another battery successively when the using battery has a voltage drop less than a set level to save the time for the replacement of the battery. CONSTITUTION:The voltage Va divided by resistance R1 and R2 is used for the voltage monitor of a battery 12a; while the voltage Vb divided by the resistance R3 and R4 is used for the voltage monitor of a battery 12b. Both voltages Va and Vb are compared with the constant voltage Vz obtained by a Zener diode ZD1 by comparatores 18a and 18b respectively. Thus both comparators detect whether the voltages of batteries 12a and 12b are reduced less than the set voltage. The output of the comparators 18a and 18b are supplied to a control circuit 16. The circuit 16 actuates a relay circuit 17 to cut off the battery having a voltage drop and to always select a battery having the voltage higher than a prescribed level of the power supply voltage.
Inventors:
HAYASHI KIYOTSUGU
Application Number:
JP16475483A
Publication Date:
March 30, 1985
Filing Date:
September 06, 1983
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G11B33/00; (IPC1-7): G11B33/00
Attorney, Agent or Firm:
Yoshihiro Morimoto
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