JPS609945Y2 - cassette tape recorder - Google Patents

Description

[Detailed description of the invention] This invention is a cassette that has a capstan drive motor and a reel shaft drive motor separately, and the movement of the head board is controlled using the driving force of the capstan drive motor. The present invention relates to a tape recorder, and particularly to a control circuit for a reel shaft drive motor.

Recently, cassette tape recorders have been commercialized that use the driving force of a motor to control the movement of the head board, improving operability, but since the head board is moved slowly to the playing position, the magnetic head is It takes time for the tape to come into contact with the tape, and during this time the tape is run, causing problems such as unerased portions remaining during recording.

Therefore, the present invention was developed in view of this point, and the reel shaft drive motor is stopped until the head board is moved to the playing position, and when the magnetic head comes into contact with the tape, the reel shaft drive motor is stopped. The present invention provides a cassette tape recorder configured to start the cassette tape recorder.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a capstan driving motor, which is constantly driven by turning on a power switch (not shown).

Reference numeral 2 denotes a play solenoid that is energized when the play switch 3a is turned on, and acts to transmit the driving force of the capstan driving motor 1 to the head substrate by a mechanism not shown.

Reference numeral 4 denotes a fast-forward solenoid that is energized when the fast-forward switch 5b or rewind switch 6b is turned on, and similarly operates to switch the drive mechanism to the fast-forward or rewind state using the driving force of the motor.

7 is a reel shaft driving motor, one electrode A is supplied with power from a play switch 3b via a delay circuit 8, and the other electrode B is supplied with power via a fast forward switch 5a; Power was supplied through the return switch 6a, the collector was connected to the missing electrodes A and B, the emitter was grounded, and a bias was supplied to the base from opposite electrodes through resistors 9 and 10. Transistors 11 and 12 are provided and constitute a control circuit for the reel shaft drive motor 7.

The delay circuit 8 includes a transistor 13 whose collector is connected to the play switch 3b and whose emitter is connected to the reel shaft drive motor 7, and a resistor 1 that supplies a base bias.
4 and a capacitor 15.

In addition, play switch 38g31)s fast forward switch 5a,
5b and the rewind switches 6a and 6b are configured to interlock with each other.

Next, the operation of the present invention having such a configuration will be explained.

First, when recording or playing back a tape, when the play switches 3a and 3b are turned on, the play solenoid 2 is energized and the head board (not shown) starts to move to the playing position by the driving force of the motor. The transistor 13 is non-conductive due to the time constant of the resistor 14 and the capacitor 15, and power is not supplied to the reel shaft drive motor 7, so the reel shaft drive motor 7 is stopped and the tape is not run.

The time constant of the delay circuit 8 is determined when the head board moves to the playing position.
When the magnetic head comes into contact with the tape, the transistor 13 is set to conduct. When the transistor 13 is conductive, power is supplied to one electrode A of the reel shaft drive motor 7, and the transistor 11 is rendered conductive. A current flows through the reel shaft drive motor 7 in the direction of the solid arrow, rotating the reel shaft in the tape winding direction.

Next, when the fast-forward switches 5a and 5b are turned on, the solenoid 4 is energized and the drive mechanism (not shown) enters the fast-forward state, and power is directly supplied from the fast-forward switch 5a to one electrode A of the reel shaft drive motor 7. As a result, the reel shaft drive motor 7 drives the reel shaft at high speed in the same rotational direction as during playback, and winds the tape at high speed.

When the rewind switches 6a and 6b are turned on, the solenoid 4 is energized to switch to the high speed state as in the case of fast forwarding, and the other electrode B of the reel shaft drive motor 7 is switched from the rewind switch 6a this time. When power is supplied to the reel shaft drive motor 7, the transistor 12 becomes conductive and a current flows in the direction of the dashed arrow in the reel shaft drive motor 7, and the rotation direction of the motor is reversed to rewind the tape at high speed.

As mentioned above, the cassette tape recorder of the present invention is configured to start the reel shaft drive motor after a predetermined period of time has passed since the switch is operated during recording or playback, so that the head board can be moved using the driving force of the motor. This solution solves problems such as non-erasing or tape passing that occur during control, and has great practical effects.

[Brief explanation of drawings]

The drawing shows the configuration of the cassette tape recorder of the present invention. 1...capstan drive motor, 2...
... Solenoid for play, 3at 3b...
・Play switch, 4...Fast forward solenoid, 5a, 5b...Fast forward switch, 6a, 6b
...Rewinding switch, 7...Reel shaft drive motor....Delay circuit.

Claims (1)

[Scope of utility model registration request] In a cassette tape recorder that has separate capstan drive motors and reel shaft drive motors, and uses the driving force of the capstan drive motor to control the movement of the head board, it is possible to control the movement of the head board from the switch operation during recording or playback. A cassette tape recorder characterized in that a delay circuit is provided in the power supply path of the reel shaft drive motor so as to start the reel shaft drive motor after a predetermined period of time has elapsed.