JPS581871Y2 - Tape recorder control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a control circuit for a tape recorder in which operation switching is performed by suction action of a plunger.

The method of switching the tape recorder's operation by using the suction action of the plunger is used in high-grade tape recorders called tape decks, and these tape recorders have the basic functions of recording, playback, fast forwarding, rewinding, and stopping. In addition, it is equipped with a pause function that temporarily stops the running of the tape during recording and playback.

The present invention aims to provide a device that allows the temporary stop operation to be performed not only manually but also remotely (hereinafter referred to as remote control), and will be described in detail below with reference to the drawings.

The illustrated circuit is one embodiment of the present invention.

In the figure, 1 is a microphone that receives ultrasonic signals sent from an ultrasonic oscillator (not shown), 2 is a remote control circuit that amplifies the signal obtained from the microphone 1 and outputs a control signal, and 3 is a manual control circuit. A self-resetting pause switch 4 is closed when a pause operation is performed and is opened when the suppression operation is released; This is a transistor that is inverted from an off state to an on state every time the switch 3 is closed.

Reference numeral 5 denotes a flip-flop circuit composed of transistors 6, 7, etc., which performs an inversion operation each time the transistor 4 is inverted to the on state, and during non-pause operation, the transistor 6 is in the on state. , the transistors l are configured to be in an off state.

8 is a suction operation during the reproducing operation, and slides and displaces the slide board on which the magnetic head and pinch roller are attached to the operating position, presses the pinch roller against the key block, and operates the reel shaft drive mechanism to increase the winding. This is a regeneration plunge.

Reference numerals 9 and 10 indicate drive transistors that cause the regeneration plunger 7-8 to perform a suction operation; 11 indicates a control transistor that controls the operation of the drive transistors 9 and 10; The collector of the transistor 1 constituting the flip-flop circuit 5 is connected through the transistor 14.

15 is a display transistor whose emitter is grounded and whose collector is connected to a light emitting diode 16; its base is connected to the collector of the transistor 6 via a resistor 11 and a diode 18;

Reference numeral 19 denotes a switching transistor which generates an alternating current signal in accordance with the rotation of the reel shaft, and a switching transistor which repeatedly turns on and off in response to the output signal l of the signal generation circuit 19. Reference numeral 19 denotes a switching transistor that repeatedly turns on and off in response to the output signal l of the signal generation circuit 19. When charged through resistor 22.23 and when the transistor 20 is in the on state, resistor 23.1
4 and a charging/discharging capacitor that is discharged through the collector-emitter path of the transistor 20, and is set so that its charging potential does not rise above a predetermined value while the reel shaft is rotating.

25 is a transistor that is turned on when the charging potential of the charging/discharging capacitor 21 exceeds a predetermined value; 26;
is a transistor which, when the transistor 25 is reversed to the on state, is reversed to the on state along with the reversal operation and at the same time causes the driving transistor 28, which causes the stop plunger 7-27 to perform a suction operation, to be reversed from the on state.

Reference numeral 29 represents a stop switch that is closed during a stop operation, and 30 represents a feedback circuit provided to quickly reverse the operation of the transistors 25, 26 and 28.

Further, the base of the switching transistor 20 is connected to the collector of the transistor 6 constituting the flip-flop circuit 5 via a resistor 31 and a diode 32.

33 is a switch that is closed during playback, fast forwarding and rewinding operations.

The present invention is constructed as described above, and its operation will be explained next.

In the stopped state, pause switch 3, playback switch 1
2 and switch 33 are in an open state, transistor 4 is in an off state, and transistor 6.1 constituting the flip-flop circuit 5 is in an on and off state, respectively.

In this state, when a regeneration operation is performed, the regeneration switch 12 and the switch 33 are closed.

As a result, the control transistor 11 and the driving transistors 9 and 10 are turned on, and the regeneration plunger 7-8 is turned on.
Activate the suction operation.

When the playback plunger 8 performs a suction operation, the slide board slides to the operating position F, brings the magnetic head into contact with the magnetic tape, and presses the pinch roller against the pushbutton, thereby increasing the reel shaft drive mechanism. When activated, the tape recorder enters playback mode.

While the tape is running in such a playback state, as the reel shaft rotates, an AC signal is output from the signal generating circuit 19, and the switching transistor 20 repeats on/off operations, so that the charging potential of the charging/discharging capacitor 21 exceeds a predetermined value. It will not rise to .

Therefore, the transistors 25, 26, and 28 are not turned on, and the stop plunger 7-27 does not perform suction operation.

When the reproducing operation is performed and the tape reaches its end, the rotation of the reel shaft stops and the AC signal from the signal generating circuit 19 disappears.

As a result, the switching transistor 20, which has been repeatedly on and off, is continuously turned off, and the charging/discharging capacitor 21 is no longer discharged.

The charging potential of the light emitting discharge capacitor 21 rises, and when the charging potential reaches a predetermined value, the transistor 25.
26°28 is inverted from the on state.

Therefore, the stopping plunger 7-21 performs a suction operation to open the closed reproducing switch 12 and switch 33, and the tape recorder enters the stopped state.

Furthermore, when a stop operation is performed in the reproducing state, the stop switch 29 is closed, and the charging/discharging capacitor 21 is continuously charged through the stop switch 29, so that the transistors 25, 26, and 28 are turned on. The stopping plunge 7-27 is activated for suction.

Therefore, the tape recorder is in a stopped state rather than a playing state.

The reproducing operation, stopping operation, and automatic stopping operation are performed as described above, but the temporary stopping operation will be explained next.

When a remote control signal is sent in the reproduction operation state, a control signal is output from the remote control control circuit 2, and the signal inverts the transistor 4 to its on state.

As a result, the flip-flop circuit 5 is inverted, the transistor 6 which was in the on state is inverted to the off state E, and the transistor 1 which was in the off state is inverted to the on state.

When the transistor 1 is inverted to the on state, the potential of the collector of the transistor 1 decreases, so that the control transistor 11 is inverted to the off state, and accordingly, the driving transistors 9 and 10 are also inverted to the off state.

Therefore, the regeneration plunger 7-8, which was in the suction operation, is in a non-suction state (the slide board, which was in the regeneration operation position E), retreats to the temporary stop position, and the pinch roller is separated from the plunger. The single-winding reel shaft drive mechanism enters a non-operating state, and the tape recorder enters a temporary stop operating state.

Furthermore, in this paused state, the transistor 6 of the flip-flop circuit 5 is in an off state, so its collector is at a high potential.

The number display transistor 15 is in an ON state and the light emitting diode 16 is lit to indicate that a temporary stop operation is being performed.

In this temporary stop state, the rotation of the reel shaft is stopped, so the alternating current signal from the signal generation circuit 19 disappears, but the base of the switching transistor 20 that controls the charging and discharging operation of the photodischarge capacitor 21 is connected to the collector of the transistor 6. Since more bias current is supplied, the transistor 20 remains on for one time.

The charging potential of the light emitting discharge capacitor 21 will not rise, and the stop plunge +7-21 will not erroneously perform a suction operation.

At this temporary stop position, when the remote control signal is sent out again, the remote control control circuit 2 outputs the control signal and the transistor 4 is turned on again.

As a result, the flip-flop circuit 5 is inverted and the transistors 6.1 return to their on and off states, respectively.

Therefore, the reproducing plunger 8 enters the suction operation state, and the tape recorder returns to its original reproducing operation state.

Thereafter, each time a remote control signal is sent out, the operations described above are performed, and the tape recorder is temporarily stopped and released.

The pause operation using the remote control has been explained above, but next we will explain the pause operation manually.

In this case, every time the pause switch 3 is closed, the transistor 4 is inverted to the on state, and each time the E flip-flop circuit 5 is inverted, the above-mentioned operation is performed, and the tape recorder's pause operation and release operation are performed. It is done.

Note that the pause position, which is the retracted position during the pause operation of the slide board from the reproduction operation position, is the third position l between the reproduction position and the stop position, even if it is the stop position in the stopped state.
You can also rub it.

Further, in this embodiment, although the explanation has been made in the case where ultrasonic waves are used as the remote control signal, it is of course possible to use radio waves or lasers.

As explained above, the present invention is not only extremely convenient because it can perform the temporary stop operation and release not only manually but also by remote control operation. Its practicality is great because it can prevent malfunctions due to its simple configuration.

[Brief explanation of the drawing]

The illustrated circuit is one embodiment of the present invention. Explanation of main drawing numbers, 2... Remote control control circuit, 3
...Pause switch, 5...Flip-flop circuit, 8...Plunge for regeneration 7-
112... Playback switch, 19...
Signal generation circuit, 20... Switching transistor, 21... Charge/discharge capacitor, 27.
... Stop plunge 7-129 ... Stop switch.

Claims (1)

[Scope of utility model registration request] In a tape recorder equipped with an automatic stop device that returns the tape recorder to a stopped state by detecting the stoppage of rotation of the reel shaft, a suction operation is performed during playback operation to press the pinch roller to one pin and the take-up reel shaft. Regeneration plunger 7 that activates the drive mechanism
, a remote control control circuit that outputs a control signal every time it receives a remote control signal such as an ultrasonic wave, a self-resetting pause switch that is closed when a pause operation is performed, and an output signal of the remote control control circuit. a flip-flop circuit that repeats an inversion operation each time an electric current is applied and each time the temporary stop switch is closed; a signal generating circuit that generates an alternating current signal in accordance with rotation of the reel shaft; and the signal generating circuit. A switching transistor is turned on and off by the output signal l of the switching transistor, a charging/discharging capacitor is repeatedly charged and discharging by turning the switching transistor on and off, and the charging/discharging capacitor is turned on when the charging potential of the charging/discharging capacitor reaches a predetermined value of 1. The regeneration plunger is activated by the output signal of the remote control control circuit in the regeneration operation state or by the reversal of the flip-flop circuit caused by the closing of the temporary stop switch. 1. A control circuit for a tape recorder, characterized in that the stop plunger 7- is brought into a non-operating state and the switching transistor is turned on, thereby preventing a suction operation of the stop plunger 7-.