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    • 9. 发明授权
    • Automatic backspace device for a tape recorder
    • 磁带录音机的自动后退装置
    • US4574321A
    • 1986-03-04
    • US443220
    • 1982-11-22
    • Katsumi Kanayama
    • Katsumi Kanayama
    • G11B15/20G11B19/02G11B15/48
    • G11B19/02G11B15/20
    • The disclosed automatic backspace device, in a tape recorder or transcriber or the like, is rewound for a specific period of time. A transistor is turned on by an electrical current from a time constant circuit in response to tape reproduction seen by an operating switch. The transistor charges a capacitor which discharges a constant electrical current through a parallel-connected transistor in a current mirror circuit whose other transistor is supplied with a predetermined electrical current. Another transistor is turned on by the discharge current of the capacitor to carry out the rewinding of the magnetic tape.
    • 所公开的自动退格装置,在磁带录音机或录音机等中,被重绕一段特定的时间。 响应于由操作开关看到的磁带再现,晶体管由来自时间常数电路的电流导通。 晶体管对在其另一个晶体管被提供预定电流的电流镜像电路中通过并联晶体管放电恒定电流的电容器进行充电。 另一晶体管由电容器的放电电流导通,以进行磁带的倒带。