JPS6025714Y2 - tape recorder - Google Patents

Description

[Detailed description of the invention] The present invention locks the operating position of the fast-forwarding or rewinding operating means when the operating means for fast forwarding or rewinding is operated from the playback state in which the operating means for playing is locked at the operating position, Fast forward or rewind with the tape in contact with the magnetic head, and use a plunger that operates when the magnetic head detects a no-signal section between multiple songs recorded on the magnetic tape. To provide a tape recorder which can immediately return to a playback state after unlocking an operating means and can play back a song from the beginning.

In particular, the present invention detects the presence or absence of an audio signal recorded on the tape and activates the plunger when a non-signal portion is detected.■ In the playback state when the playback operation means is operated, the signal detection circuit changes to the signal detection state. Forcibly set to the signal detection state even in the fast forward or rewind state where the fast forward or rewind operating means has been operated ■ The playback operating means and the fast forward or rewind operating means have been operated. state (commonly referred to as queue or review state).

) is set so that it responds to the presence or absence of an audio signal only when each operating means is locked in the operating position, and the signal line from the magnetic head is constantly connected to the signal detection circuit without going through a mechanical switch. It is designed to effectively operate the signal detection circuit by using a switch that supplies power to the amplifier circuit and the like.

The circuit configuration of the tape recorder of the present invention shown in the drawings will be explained below.

Reference numeral 1 denotes an amplifier circuit in which an audio signal extracted by a magnetic head is applied to an input terminal 2. Reference numeral 3 denotes an amplifier circuit in which an audio signal extracted by a magnetic head is applied to an input terminal 2; and 3, an operating position of a reproduction operation lever as a reproduction operation means is controlled by a first locking means (not shown). When locked, the movable contact piece 3a changes from the terminal OFF to the terminal ON to close the circuit. 4 is the operating position of the fast-forward operating lever or the rewind operating lever as the operating means for fast-forwarding or rewinding. The second locking means (
(not shown), the movable contact piece 4a changes from the terminal OFF to the terminal ON, and each terminal of the second switch, the first switch 3, and the second switch 4 is turned ON to close the circuit.
is connected to the common power supply 10B, and its terminal -0FF is open.The movable contact piece 3a is connected to the base of the first switching transistor 5 via a resistor 6, and the movable contact piece 4a is connected to the second switching transistor 7. is connected to the base of the circuit via a resistor 8.

When the playback control lever is operated, the tape recorder enters the playback state, and when the fast forward or rewind control lever is operated, the tape recorder enters the fast forward or rewind state, and after the playback control lever is operated, the fast forward control lever is activated. , or by operating the rewind operation lever, the tape can be fast-forwarded or rewinded (while the magnetic head is in contact with the tape).

Movable contact piece 3a of the first switch 3 and second switch 4
The movable contact piece 4a is connected to the power supply line of the automatic stop detection circuit 11, the motor circuit 12, the signal detection circuit 1, and the amplifier circuit 1 via a first diode 9 and a second diode 10, respectively.

The first switching transistor 5 is the first switch 3
When it is closed, an operating voltage is applied to its base through the resistor 6°6', turning it on, and the anode side of the third diode 14 connected to its collector becomes ground potential.

At this time, the fourth diode 15 connected to the collector of the second switching transistor 7 is connected to the resistors 16, 17 and 18.
Through the signal detection circuit above, the detection transistor 19
An operating voltage is applied to the base of the detection transistor 19 to forcibly turn on the detection transistor 19.

In this state, there is an audio output signal from the amplifier circuit 1,
This output is applied as a positive voltage to the base of the detection transistor 19 through the rectifying diode 20, which is the same as turning on the detection transistor 19.

Further, when the second switch 4 is closed, the second switching transistor 7 is turned on by applying an operating voltage to its base through the resistor 8.8', and the fourth diode 15 connected to its collector is turned on. The anode side is at ground potential.

At this time, the third diode 14 applies an operating voltage to the base of the detection transistor 19 of the signal detection circuit 13 through the resistors 21, 17, and 18 to forcibly turn on the detection transistor 19.

When the detection transistor 19 is ON, the anode side of the fifth diode 22 connected to its collector is at the ground potential, so no operating voltage is applied to the base of the drive transistor 23, and the drive transistor 23 is OF.
It's F.

When the detection transistor 19 is turned off, the fifth diode 22 applies an operating voltage to the base of the drive transistor 23 through the resistors 24 and 25, turning on the drive transistor 23 for operating the plunger 26.

Further, the automatic stop detection circuit 11 is connected to a reel shaft (not shown).
A detection switch 27 detects the rotation when the is rotating.
When the pulse input is stopped, the pulse input by the detection switch 27 is stopped, and an operating voltage is applied to the base of the drive transistor 23 of the signal detection circuit 13 through the diode 28, and the drive transistor 23 is turned on. It is configured as follows.

A plunger 26 connected between the collector of the drive transistor 23 and the power source 1B is configured to operate the fast forward operating lever (or rewind operating lever) when both the playback operating lever and the fast forward operating lever (or rewind operating lever) are locked. In the playback state where the playback control lever is locked, only the return control lever is unlocked, and in the playback state where the playback control lever is locked, that control lever is unlocked, and in the fast forward state where the fast forward control lever (or rewind control lever) is locked. (or in the rewinding state), it acts to unlock these operating levers.

The tape recorder of the present invention is constructed as described above, and its operation will be explained below.

When the regeneration operation lever is operated, the first switch 3 is closed.

By closing the first switch 3, power is supplied to the signal detection circuit 13, automatic stop circuit 11, and amplifier circuit 1 through the first diode 9, and the first switching transistor 5
becomes ON.

When the first switching transistor 5 is turned on, the anode side of the third diode 14 is grounded, but the fourth diode 15 connects the operating voltage to the base of the detection transistor 19 in the upper chamber of the signal detection circuit through the resistors 16, 17 and 18. When the voltage is applied, the detection transistor 19 is turned on.

That is, the audio signal from the amplifier circuit 1 is transmitted to the rectifier diode 2.
It is forcibly set to a state where it is always applied through 0.

Therefore, the drive transistor 23 of the signal detection circuit 13 is always set to OFF, and the amplifier circuit 1
Even if the audio signal from the sensor disappears, the detection transistor 19 and the drive l transistor 23 do not operate inverted, and the plunger 26 does not malfunction.

The second switch 4 is closed during fast forwarding or rewinding by operating the fast forwarding or rewinding operation lever.

At this time, the second switching transistor 7 is turned on and the anode side of the fourth diode 15 is set to the ground potential, but the third diode 14 applies the operating voltage to the base of the detection transistor 19 of the signal detection circuit 11 through the resistors 21, 17 and 18. is applied and the detection transistor 19 is turned on, so that the plunger 26 will not malfunction during fast forwarding or rewinding when the magnetic spatulas 1 to 1 are separated from the tape and no audio signal can be detected.

Next, when the playback operation lever and the fast forward (or rewind) operation lever are both operated and the tape is running fast forward (or rewind) with the magnetic head in contact with the tape, the first switch 3 and The second switches 4 are both closed.

Therefore, at this time, the first switching transistor 5 and the second switching transistor 7 are turned on, and the anode sides of the third and fourth diodes 1-14.15 are both brought to the ground potential. It is set to respond to the presence or absence of the output of the rectifying diode 20 that rectifies the audio signal.

Therefore, in the state of refusal, when the audio signal is 1, the detection transistor 19 is ON, the drive transistor 23 is OFF, and the plunger 26 does not operate, and when a no-signal area on the tape is detected and the audio signal becomes 1 or 1, the detection transistor 19 is ON. The detection transistor 19 is turned off, the drive transistor 23 is turned on, and the plunger 26 operates.

Since this operation of the plunger 26 only unlocks the fast-forward (or rewind) operating lever, the tape recorder is placed in the playback state by the playback operating lever that has already been operated.

As described above, in the tape recorder of the present invention, the signal line from the magnetic head is always connected to the signal detection circuit without going through a mechanical switch, and playback, fast forward (or rewind) operations can be performed. Since the signal detection circuit is effectively operated by electronic switching in response to the first and second switches that supply power to the amplifier circuit, etc., during normal playback, fast forwarding, and rewinding, This has the effect of being able to reliably operate the plunger in response to a no-signal area on the tape only when performing playback and fast forward (or rewind) operations to locate the beginning without causing the plunger to malfunction. It is.

In particular, the present invention simplifies the circuit because it cleverly utilizes a switch for supplying power to an amplifier circuit, etc., to control the signal detection circuit.

[Brief explanation of the drawing]

The figure is a circuit diagram of the tape recorder of the present invention. DESCRIPTION OF SYMBOLS 1... Amplifier circuit, 3... First switch, 4... Second switch, 5... First switching transistor, 7... ...Second switching transistor, 9...First diode, 1
0...Second diode, 11...Automatic stop detection circuit, 11...Signal detection circuit, 14...
...Third diode, 15...Fourth diode, 19...Detection transistor, 20...
... Rectifier diode, 23 ... Drive transistor, 26 ... Plunger.

Claims (1)

[Scope of utility model registration request] When operating the fast forward or rewind operating means from the playback state in which the playback operating means has been operated, the tape is fast forwarded or rewinded with the tape in contact with the magnetic head, and the non-signal portion on the tape is removed by the magnetic head. In a tape recorder configured to return to the playback state upon detection,
a first switch that closes when the playback operation means is operated; a second switch that closes when the fast forward or rewind operation means is operated; and a second switch that becomes GOH on the day the first switch is closed. a second switching transistor that is turned ON when the second switch is closed; a signal detection circuit that detects the presence or absence of an audio signal and operates the plunger in response to detection of no signal; When either the first or second switching transistor is ON, the signal detection circuit is forcibly set to a signal detecting state, but when both the first and second switching transistors are ON, the signal detection circuit is not detected. A tape recorder, comprising a setting circuit for setting the circuit to respond to the presence or absence of an audio signal, and configured such that operation of the plunger releases the operating state of the fast forward or rewind operating means.