JPS5912772Y2 - Tape recorder control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder equipped with a so-called standby function that releases the paused state and puts the tape recorder into recording or playback mode when power is supplied by a timer device at a set time.

The standby state of such a tape recorder is the same state as when a pause operation is performed during the recording or playback operation, and when power is supplied by the timer device, the pause state is canceled and the recording or playback operation is started. Each mechanism of the tape recorder is configured as follows.

In order to configure such a standby mechanism, a standby switch is generally provided and standby operation is performed by switching this switch, but it is inconvenient to use this because it is easy to forget to operate this switch. It was something.

Furthermore, if the recording operation is started immediately after the power is supplied by the timer device, problems arise in that the rising noise of the amplifier circuit is recorded or abnormal recording is performed until the rotation of the J motor reaches a constant speed.

The present invention has been developed in view of these points, and will be described in detail below with reference to the illustrated embodiments.

In the figure, 1 and 2 are a first resistor and a capacitor connected in series between the power supply line 3 and the ground, and 4 is a pulse generation circuit that performs an inverting operation and outputs a pulse signal when the charged potential of the capacitor 2 reaches a predetermined value. Yes, transistor 5
, 6, a differentiating circuit 9 consisting of a capacitor 7 and a resistor 8, and a Zener diode 10 for setting an operating point.

Reference numeral 11 is a plunger for canceling the paused state, and reference numeral 12 is a driving transistor that operates for a short time in response to a pulse signal from the pulse generating circuit 4 to drive the plunger 11.

Reference numeral 13 denotes a control switch that is switched in conjunction with the temporary stop operation button, the movable terminal 13a of which is connected to the power supply line 3, and the first fixed terminal 13b that comes into contact with the movable terminal 13a in the temporary stop state connected to the planar A second fixed terminal 13C, which is connected to the power supply terminal of the jar 11 and is in contact with the movable terminal 13a in the non-pause state, is connected to a connection point P between the first resistor 1 and the capacitor 2 and is smaller than the first resistor 1. It is connected via a second resistor 14 having a resistance value of .

In such a circuit, the delay time due to the first resistor 1 and capacitor 2 is set to several seconds, and the delay time due to the second resistor 14 and capacitor 2 is set to several tens of milliseconds.

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

The illustrated state is a standby state, in which the tape recorder is in the recording or playback state, with the pause operation button being operated, and power is not being supplied to the power supply line 3.

In this state, when the set time comes, power is supplied from the timer device and the electric motor starts rotating, but since it is in a paused state, the magnetic tape is not driven to run.

Further, when power is supplied from the timer device, a predetermined voltage is applied to the power supply line 3, so that a charging current flows to the capacitor 2 through the first resistor 1.

When the charged potential of the capacitor 2 reaches a predetermined value after a predetermined time, that is, several seconds, the Zener diode 10 becomes conductive, and the transistors 5 and 6, which were in a non-conductive state, are reversed to a conductive state.

As a result, a pulse signal, which is a signal from the differentiating circuit 9, is applied to the base of the driving transistor 13, during which the transistor 12 is reversed to a conductive state, causing the plunger 11 to perform a suction operation.

Accordingly, the pause state is released, the control switch 13 is switched to the opposite side from the state shown, and the tape recorder enters the recording or playback operating state.

When the end of the tape is reached after the recording or playback operation is performed, the tape recorder returns to the stopped state by the action of the automatic stop device.

Although the standby operation is performed as described above, the operation in the normal use state will be explained next.

In this case, the control switch 13 is in the non-pause state.
The fixed terminal 13 is in a state where it is switched to the C side, and in this state, when the switch (not shown) is mainly closed and power is supplied, a predetermined voltage is applied to the power supply line 3, and the capacitor 2 is connected to the control switch 13 and It is rapidly charged through the second resistor 14.

When the charging potential of the capacitor 2 reaches a predetermined value, the transistors 5 and 6 are turned on as described above, and a pulse signal is sent from the differentiating circuit 9 to the driving transistor 12.
However, since power is not supplied to the power supply terminal of the plunger 11 by switching the control switch 13, the plunger 11 does not perform a suction operation.

Therefore, not only no unnecessary operation is performed, but also no suction operation noise of the plunger 11 is generated.

In addition, if a temporary stop operation is performed immediately after the main switch is closed and power is supplied, the control switch 13
is switched to the state shown and power is supplied to the power supply terminal of the plunger 11, but before the control switch 13 is switched, the capacitor 2 is charged and the transistor 5.6 is reversed to a conductive state. Therefore, when the movable terminal 13a of the control switch 13 comes into contact with the first fixed terminal 13b, the pulse signal from the differentiating circuit 9 has disappeared, and the plunger 11 is not caused to perform a suction operation.

As explained above, the control circuit of the present invention is configured to perform standby operation by using the temporary stop operation button provided for performing temporary stop operation, so a special control circuit for performing standby operation is required. There is no need to provide an operation button, so the configuration is simple, and the device has excellent operability and is extremely convenient.

In addition, the charging time of the capacitor during standby operation is extended, and after the amplifier circuit and motor are in steady operation, the plunger is sucked in to release the temporary stop state, so noise may be recorded or abnormalities may occur. No recording is made.

Furthermore, if power is supplied when the pause operation button is in the non-operating position, the capacitor will be charged in a short time, so even if the pause operation is performed immediately after turning on the power switch, the plunger will not work. There is no suction operation, and the operation associated with such a temporary stop operation is not hindered.

In addition, the present invention connects a control switch that can be switched by operating a temporary stop operation button between the power line and the plunger, so that the power supply path to the plunger is cut off when the plunger is in a non-pause state. Therefore, even if a pulse signal is generated due to the arrival of a noise signal from the pulse generation circuit, the plunger will never perform a suction operation, and wasteful suction operation and generation of suction operation noise can be reliably prevented. It has the advantage of being able to

Furthermore, the present invention has a single switch that controls the suction operation of the plunger and a switch that changes the charging time of the capacitor, which simplifies the construction and has great practical value.

[Brief explanation of the drawing]

The illustrated circuit is one embodiment of the present invention. Explanation of main drawing numbers, 1...First resistor, 2...Capacitor, 3...Power line, 4...Pulse generation circuit, 1
DESCRIPTION OF SYMBOLS 1... Plunger, 12... Drive transistor, 13... Control switch, 14... Second resistor.

Claims (1)

[Scope of utility model registration request] A tape recorder equipped with a standby function that releases a pause state and puts the tape recorder into operation when power is supplied by a timer device, comprising: a first resistor and a capacitor connected in series between a power supply line and ground; a pulse generation circuit that inverts and outputs a pulse signal by detecting the charging potential of the pulse generator; a driving transistor that drives a plunger that operates for a short time and releases the paused state in response to the pulse signal from the pulse generator circuit; a control switch that is switched in conjunction with a stop operation button and has a movable terminal, a first fixed terminal, and a second fixed terminal; a first that contacts the movable terminal when the tape recorder is in a paused state; A fixed terminal is connected to the power supply terminal of the plunger, and a second fixed terminal that contacts the movable terminal when in a non-pause state is connected to the first resistor through a second resistor having a resistance value smaller than the first resistor.
A control circuit for a tape recorder, characterized in that the control circuit is connected to a connection point between a resistor and a capacitor; and the movable terminal is connected to the power supply line.