Tape recording and playback control circuit
AssigneeArvin Industries, Inc.
InventorJohn D. Vogel
Life of this patent
Estimating the term…
Abstract
An electronic control circuit for automatically stopping the tape drive motor of a magnetic tape recording and playing unit. A set of contacts is provided in the circuit to detect electrically conductive means located at preselected points along the magnetic tape, and upon such detection, to alter the conductive states of three control transistors to cause de-energization of the tape drive motor. Diode logic means in the circuit prevent automatic stopping of the drive motor when the recording and playing unit is operated in a particular mode wherein such stopping is not desired.
Claims17
An electronic control circuit for controlling the energization of the tape drive motor of a tape recording and playing unit, comprising a voltage source connected to the drive motor for energizing said motor to convey tape past the unit recording and playing head;
- sensing means for detecting indicating means on the tape upon passage of said indicating means past the unit head;
- solid state switching means coupled between said sensing means and the motor for electrically disconnecting said voltage source from the motor upon detection of indicating means by said sensing means;
- and inhibit means having a diode with an anode and a cathode, said anode being connected to said solid state switching means and said cathode being connected to biasing means for selectively biasing said diode, said inhibit means being operative when said diode is forward-biased to prevent said solid state switching means from electrically disconnecting said voltage source from the motor.
An electronic control circuit for controlling the energization of the tape drive motor of a tape recording and playing unit, comprising a voltage source connected to the drive motor for energizing said motor to convey tape past the unit recording and playing head;
- normally conductive first solid state switching means connected between the motor and said voltage source;
- a set of normally open contacts arranged to be bridged by one of a plurality of electrically conductive strips located at preselected points on the tape when said strip passes the unit head;
- normally non-conductive second solid state switching means coupled between said contacts and said first switching means, said second switching means being switched to a conductive state upon bridging of said contacts and operative when conductive to switch said first switching means to a non-conductive state to electrically disconnect said voltage source from the motor;
- and inhibit means having a diode with an anode and a cathode, said anode being connected to said second solid state switching means, and said cathode being connected to biasing means for selectively biasing said diode, said inhibit means being operative when said diode is forward-biased to prevent said second solid state switching means from electrically disconnecting said voltage source from the motor.
An electronic control circuit for controlling the energization of the drive motor for a tape recording and playing unit, comprising a voltage source connected to the motor for energizing the motor to convey tape past the unit recording and playing head;
- first switching means operative to close upon detection of indicating means on the tape upon passage of said indicating means past the unit head;
- solid state switching means coupled between said first switching means and the motor for electrically disconnecting said voltage source from the motor upon detection of said indicating means by said first switching means;
- and inhibit means having a diode with an anode and a cathode, said anode being connected to said solid state switching means and said cathode being connected to biasing means for selectively biasing said diode for selectively preventing said solid state switching means from electrically disconnecting said voltage source from the motor.
Dependencies are inferred from the claim text.