JPS581892Y2 - Information signal recording medium reproducing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an information signal recording medium reproducing device, and in particular, when starting a motor that rotates a rotating recording medium, the current from the power supply circuit is used almost exclusively for starting the motor, thereby generating a power source. An object of the present invention is to provide an information signal recording medium reproducing device configured to reduce the power supply capacity of the circuit, increase the starting torque of the motor, and shorten the time required to reach steady rotation after starting. .

Generally, in a video disc playback device, the recording medium is operated at high speed (for example, 450°, 900.180°) in the playback performance mode.
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For this reason, the motor that rotates this requires a large amount of torque when starting up, and requires a large current of, for example, about 700 mA when starting up.

On the other hand, during steady rotation when the motor has reached a predetermined rotational speed, it is sufficient to supply the motor with a current of, for example, several tens of mA.

Further, a circuit provided in a video disc playback device that processes the picked up signal consumes approximately 700 mA of current.

Here, in conventional video disc playback devices, when the power switch is turned on, the output current of the power supply circuit is supplied to the signal processing circuit, and when the play button is operated, the output current of the power supply circuit is supplied to the signal processing circuit. In addition, the configuration is such that a new supply is supplied to the motor to start the motor.

For this reason, the power supply circuit of the conventional device has a capacity that takes into account the current required at the time of starting the motor, which has the disadvantage that the power supply capacity is unnecessary.

In addition, the motor cannot obtain a sufficiently large starting torque when starting up, resulting in the disadvantage that the starting time of the motor becomes correspondingly long.

The present invention has been constructed taking into consideration that it is not necessarily necessary for the signal processing circuit to be in operation when the computer is started, and one embodiment thereof will be described below with reference to the drawings.

FIG. 1 schematically shows an embodiment of the reproducing apparatus according to the present invention.

In the video disc playback device 1, in the stop mode, the pickup and the RAD 2 are at a standby position A shown by the two-dot chain line, and are inserted and connected between the +15■ power supply circuit 3 and the signal processing circuit 4, and are at a predetermined position. The normally open type microswitch 5, which is disposed at , is open.

Furthermore, a play button switch 7 which is inserted and connected between the power supply circuit 3 and the DC disk motor 6 is also opened.

Note that the arrangement position of the microswitch 5 and the length of the operating arm 12, which will be described later, is attached to the pickup head 2 that is transferred by the disk motor 6. The micro switch 5 is set so that it is pushed by the actuating arm 12 and closed when the micro switch 5 is closed.

When the power switch (not shown) is turned on to put the device 1 into the reproduction performance preparation mode, the power supply circuit 3 operates and the RF
Converter 8 operates.

Note that since the switches 5 and 7 are both open, the motor 6 and the signal processing circuit 4 are both in the non-operating state 1'>.

When a play button (not shown) on the device is operated in order to play in this state, the play button switch 7 is closed and the output current from the power supply circuit 3 is supplied to the motor 6 via the switch 7. , the motor 6 starts.

At this time, since the microswitch 5 is still held at the open state 1\, the output current from the power supply circuit 3 is not supplied to the signal processing circuit 4, but is exclusively supplied to the motor 6.

When the disk motor 6 is started, the turntable 9 rotates together with the video disk 10 that is being reloaded thereon, and the pickup head 2 is moved at high speed from the position A toward the playback start position B shown by the solid line.

When the pickup head 2 moves to position B, the tip side of the operating arm 12 having a predetermined length pushes the microswitch 5 disposed at a predetermined position to close it.

By closing the microswitch 5, the output current from the power supply circuit 3 is supplied to the signal processing circuit 4 for the first time, and the circuit 4 starts operating.

On the other hand, the disk motor 6 is in a steady rotation state when the microswitch 5 is closed, and therefore the necessary current to be supplied to the motor 6 is reduced, and the motor 6 is
Even when a current of about 0 mA is supplied, steady rotation is maintained.

Thereafter, the pickup head 2 is moved toward the inner circumference of the disk at a steady speed in synchronization with the rotation of the disk motor 6, and the playback needle 11 relatively scans the recording signal on the disk that is rotating at a constant speed. Regenerate the information signal.

During this regeneration, the microswitch 5 is pressed by the lower surface of the actuation arm 12 and held in the closed state.

Also, before starting playback, the television set has R.
Since the carrier wave signal is supplied from the F converter 8,
At the time T after the play button is operated, the images and sounds of the television set do not become clear and audible.

Also, during playback, the microswitch 5 is pressed by the lower surface of the actuating arm 12 and closed 1\, and the signal processing circuit 4
is kept in working condition.

After the reproduction is finished, the pickup head 2 is returned to the original position A at high speed.

In particular, in a video disc playback device that is equipped with an oscillator and detects and plays an information signal as a change in capacitance, this type of video disc playback device can be used by controlling the operation/non-operation of the oscillator with the microswitch 5. Mutual interference between disc playback devices can be effectively prevented.

In addition, in the above embodiment, the pickup head 2
The disc motor 6 is configured to be in a steady rotation state when the microswitch 5 moves to the playback start position B in contact with the disc and the microswitch 5 closes. It is not necessarily necessary that the disk motor 6 be in a steady rotation state.

In this case, as in the case of the above embodiment, the current from the power supply circuit is used almost exclusively for starting the motor during the time period 1 when the pickup head 2 moves from the stop position to the playback position. Therefore, the starting torque of the motor can be increased.

As described above, the device of the present invention is a device for reproducing information signals by relatively scanning a rotating recording medium on which information signals are recorded, and in which A switch is inserted and connected to the switch, and the switch is opened and peeled off when the motor that rotates the recording medium is started, and is closed in relation to the movement position of the signal detector after the motor is started. , the output current from the power supply circuit at the time of motor startup can be efficiently used for motor startup without supplying the output current from the power supply circuit to the signal processing circuit,
It is possible to avoid the power supply circuit from supplying a large current to the signal processing circuit and the motor at the same time, thereby allowing the use of a power supply circuit with a small power supply capacity, and further increasing the motor starting torque. As a result, it has excellent features such as being able to shorten the time required for the motor to reach a steady rotation state, and shortening the waiting time for playing the post-image after pressing the play button.

[Brief explanation of the drawing]

The figure is a diagram schematically showing one embodiment of the information signal recording medium reproducing apparatus according to the present invention. 1... Video disc playback device, 2...
・Pickup head, 3...Power circuit, 4.
... Signal processing circuit, 5 ... Normally open type micro switch, 6 ... DC disk motor, 7.
...Play button switch 10...Video disc, 12...Operating arm.

Claims (1)

[Scope of utility model registration request] A power supply circuit for supplying current to a motor that rotates the recording medium and a reproduction signal processing circuit, and a power supply circuit for a device that relatively scans a rotating recording medium and reproduces information signals recorded therein. a switch that is interposed and connected between the circuit and part or all of the signal processing circuit, is opened when the motor is started, and is closed in relation to the movement position of the signal detector after the motor is started; An information signal recording medium reproducing device comprising: