JPH05198082A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To abruptly brake a motor by detecting a recording medium and continuously reversing the motor up to a specific speed, and intermittently repeating normal rotation and reversing thereafter. CONSTITUTION:A controller 18 inputs and processes a PG signal and an FG signal and outputs a control signal to motor driving circuits 12 and 13 and a signal processing circuit 17. Further, the controller 18 inputs a reversing signal to the circuit 12 if ejecting operation is performed during the rotation of the magnetic disk 11. A head driving pulse signal is outputted to the circuit 13 and a control signal is outputted to the circuit 17. In response to the ejecting operation, the pulse driving signal is restricted to constant pulse width and a reversing signal is inputted to the circuit 17, so that the motor can be braked. Then the rotating speed of the recording medium is detected from the FG signal, and the reversing signal is continuously generated up to a predetermined speed reduction point, intermitted at the speed reduction point, and then stopped thereafter to perform brake control. Then the motor can abruptly be braked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus using a magnetic disk, an optical disk or the like as a recording medium, for example, an image recording / reproducing apparatus used in an electronic still camera.

[0002]

2. Description of the Related Art A small magnetic disk of 2 inches is used in an electronic still camera. Generally, such a magnetic disk is rotatably mounted in a package and used as a disk pack. ing.

Further, the electronic still camera is equipped with a video floppy disk drive device (hereinafter referred to as VFDD) and has a structure in which a magnetic disk is inserted and set at a predetermined inlet.

Specifically, when a magnetic disk is inserted, this magnetic disk is held by a holder and pulled in along the inserting direction. After that, the holder moves together with the magnetic disk in a direction orthogonal to the pull-in direction, and the hub of the magnetic disk is chucked on the turntable of the spindle motor to set the magnetic disk to the storage position for recording and reproduction.

In order to eject the magnetic disk, the holder holding the magnetic disk moves in the opposite direction to the above according to the eject operation, and a part of the magnetic disk is thrust into the inlet of the camera. Therefore, the magnetic disk can be ejected by fingers.

[0006]

There are two types of ejecting means for magnetic disks: one that automatically ejects when the eject button is operated, and one that ejects manually in conjunction with the operation of the eject button. That is, the automatic ejecting means is configured to automatically eject the magnetic disk after stopping the rotation even when the eject operation is rotating the magnetic disk.

Further, in the manual ejecting means, when the eject operation is carried out while the magnetic disk is rotating, the magnetic disk is ejected by interlocking with the eject button after stopping the rotation. There is one in which the magnetic disk inside is forcibly ejected in synchronization with the operation of the eject button.

Therefore, a VFDD having a manual discharging means capable of discharging while the magnetic disk is rotating
Is ejected in the state where a strong frictional force is generated between the motor shaft (turn table) and the hub of the magnetic disk when an eject operation is performed while the magnetic disk is rotating. There was a problem that the hub of the magnetic disk was damaged.

In this type of discharging means, the motor is braked by the ejecting operation, but the structure becomes complicated and the braking time is extended due to the reduction of the power supply voltage, which is sufficient. There was a problem that had to be improved due to reasons such as the inability to expect an effect. In view of the above situation, the present invention is an information recording device which is equipped with a manual ejecting means for a recording medium which detects an eject operation as quickly as possible and applies a rapid brake to the motor to solve the above problems. The purpose is to develop a playback device.

[0010]

In order to achieve the above-mentioned object, the present invention provides, as a first invention, a mechanical mechanism for ejecting a recording medium such as a magnetic disk recorded or reproduced at a storage position by an eject operation. In an information recording / reproducing apparatus having an ejecting mechanism, a control circuit for rotating a recording medium in a normal direction by inputting a pulse drive signal whose pulse width is modulated according to an FG signal to a motor drive circuit for rotating the recording medium.
Means for controlling the pulse drive signal to a constant pulse width in response to an eject operation performed while the recording medium is rotating, and a reverse signal for inputting a reverse rotation signal to the motor drive circuit. The rotation speed of the recording medium is detected from the FG signal, the reverse rotation signal is continued until the predetermined first deceleration time point, the reverse rotation signal is interrupted after the first deceleration time point, and then this reverse rotation signal is input together with the pulse drive signal. The invention proposes an information recording / reproducing apparatus, characterized in that the information recording / reproducing apparatus is provided with a break control means for stopping the operation.

According to a second aspect of the invention, there is provided an adjusting means for detecting the power supply voltage level, regulating the pulse width of the pulse drive signal in accordance with this detection level, and adjusting so that the break time becomes the shortest. The information recording / reproducing apparatus is provided.

[0012]

When the ejecting operation is performed while the rotation of the recording medium is stopped, the recording medium is ejected by the ejecting mechanism interlocked with the ejecting operation. By the eject operation, the pulse drive signal is regulated to a constant pulse width, and the reverse rotation signal is input to the motor drive circuit to shift to the brake action of the motor. Since the reverse rotation signal is continuously input until the recording medium reaches the predetermined first deceleration time,
The reverse torque of the motor acts largely and the braking force acts strongly.

After the lapse of the first deceleration time, the reverse rotation signal is intermittent, and the braking action is advanced by the intermittent reverse rotation torque of the motor. After a lapse of a predetermined time, the pulse drive signal and the reverse rotation signal are both stopped from being input, and the power supply to the motor is stopped, so that the recording medium stops without overrunning. Since the recording medium is suddenly stopped in this way, there is no particular problem even when the recording medium is ejected during rotation.

When the power supply voltage drops,
The pulse width of the pulse drive signal is regulated according to this voltage level. That is, the pulse drive signal is regulated so that the pulse width is narrowed when the power supply voltage level is high and widened when the power supply voltage level is low. It's time.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention is applied to a VFDD of an electronic still camera.
An example of the above will be described with reference to the drawings. FIG. 1 is a block diagram showing an electric circuit of VFDD.
Is a magnetic disk, 12 is a motor drive circuit of a spindle motor for rotating the magnetic disk 11, and 13 is a motor drive circuit of a stepping motor for moving the magnetic head 14.

Reference numeral 15 is a waveform shaping circuit, and an FG (feedback generator) for feeding back a PG signal generated by a PG (pulse generator) coil 16 for detecting an image phase and a rotation speed signal of the magnetic disk 11. The signal and waveform are shaped and output. A signal processing circuit 17 receives an image signal output from the solid-state image sensor, processes the image signal so as to be suitable for magnetic recording, and sends the processed image signal to the magnetic head 14.

Reference numeral 18 denotes a controller including a CPU, a RAM and the like, which inputs a PG signal or an FG signal to perform a signal operation and outputs a control signal for the motor drive circuits 12, 13 and the signal processing circuit 17. That is, the PWM signal (pulse drive signal) pulse-width modulated based on the FG signal is input to the motor drive circuit 12, and the spindle motor is normally rotated at a rotation speed according to the pulse width.

Further, the controller 18 outputs a reverse rotation signal (REV signal) when the eject operation is performed during the output of the PWM signal, that is, during the rotation of the magnetic disk 11.
Input to the drive circuit 12. In addition, to the motor drive circuit 13, a head drive pulse signal (HE
D signal) and a control signal (CON signal) to the signal processing circuit 17.

The above REV signal will be described with reference to FIG. When an eject operation is performed while the magnetic disk 11 is rotating, the controller 18 regulates the PWM signal to a constant pulse width determined from the input state of the FG signal and outputs the REV signal.

The controller 18 continues the REV signal until the pulse period Tg of the FG signal reaches a predetermined pulse period T1, but when the pulse period Tg becomes larger than T1, each of the FG signals is changed. The REV signal is temporarily turned off in synchronization with the start-up, and the REV signal is interrupted. Further, when the pulse period Tg becomes larger than the predetermined pulse period T2, RE
At the same time that the V signal is turned off, the PWM signal is also turned off.

Further, the above VFDD has an eject switch 19 and a discharge detection switch 2 for the magnetic disk 11.
0 is provided, and the Low signal generated by the closing operation of these switches 19 and 20 is used as an eject signal (EJC signal) and a discharge signal (DIS signal) in the controller 18.
The controller 18 determines whether to eject or eject.

As shown in FIG. 3A, the eject switch 19 is a normally open type switch that is closed by sliding operation of the eject button 21 and outputs an EJC signal. Further, the eject button 21 closes the eject switch 19 at the timing shown in FIG. That is,
When the eject button 21 is slid from the position indicated by the solid line in the figure, the magnetic disk 11 starts to be ejected by a mechanical ejecting mechanism that is interlocked with the eject button 21.

Then, the eject button 21 is shown by a two-dotted line 2 in the figure.
When the sliding operation is performed to the position 1a, the eject switch 19 is closed, and the magnetic disk 11 is ejected by sliding the operation to the position indicated by the two-dot chain line 21b in the figure. When the magnetic disk 11 is ejected, the ejection detection switch 20 is closed to output the DIS signal.

Next, the operation of the above VFDD will be described. By storing the magnetic disk 11 in the camera, the disk 11 is set in the VFDD as in the conventional example. Then, by releasing the camera, a PWM signal is sent from the controller 18 to the motor drive circuit 12, and the magnetic disk 11 is rotated by the rotation of the spindle motor. Further, the image signal output from the solid-state image sensor is input to the signal processing circuit 17, and the image signal subjected to the signal processing is sent to the magnetic head 14 and recorded on the magnetic disk 11.

After recording, the magnetic disk is ejected by sliding the eject button 21. Then, if the rotation of the magnetic disk 11 is stopped when the eject button 21 is operated, the magnetic disk 11 is ejected by the ejecting mechanism linked to the sliding operation of the eject button 21.

When the eject button 21 is slid while the magnetic disk 11 is rotating, a sudden break is applied to the rotation of the magnetic disk 11, and this break causes the magnetic disk 11 to move. Let it drain.

The break operation in this case will be described with reference to the time chart of FIG. Magnetic disk 1
When the eject button 21 is slid while 1 is rotating, the controller 18 inputs the EJC signal by closing the eject switch 19, and from this time t0, the PWM
The signal is regulated to a signal having a constant pulse width, and the REV signal is output and sent to the motor drive circuit 12.

Therefore, the spindle motor is braked, the rotation of the magnetic disk 11 starts decelerating, and the pulse period Tg of the FG signal gradually increases. Magnetic disk 1
When the rotation of No. 1 reaches the first deceleration time t1,
Since g> T1, the controller 18 operates so that the REV signal is temporarily turned off each time the FG signal rises, as described above.

The deceleration of the magnetic disk 11 is further promoted by the above-mentioned breaking operation, and the pulse period Tg of the FG signal is further expanded. When the rotation of the magnetic disk 11 reaches the second deceleration time t2, the controller 18 sets Tg>
The condition of T2 is judged and the output of the PWM signal and the REV signal is stopped.

As a result, the stepping motor is unpowered, and the magnetic disk 11 is stopped by stopping this motor. The magnetic disk 11 is ejected in association with the sliding operation of the eject button 21 with such a break.

When the magnetic disk 11 is ejected, the ejection detection switch 20 is closed to input the DIS signal to the controller 18. By the input of this DIS signal, whether the eject button 21 of the controller 18 is operated earlier or later, that is, the magnetic disk 11 is operated.
Is discharged quickly or slowly, and the output stop point of the PWM signal and the REV signal is determined.

FIG. 5 is a time chart similar to FIG. 4, showing a case where the eject button 21 is slowly operated and a normal break is applied. In this case, the break time TB
In the relationship that K satisfies TBK ≦ TM <TS, the magnetic disk 1
1 is the PWM signal and REV at the second deceleration time t2 (FIG. 4)
The output of the signal is stopped, and the brake operation is performed as described with reference to FIG. Note that TS is the time from the closing operation of the eject switch 19 to the closing operation of the discharge detection switch 20, and TM is the counting time of the timer provided in the controller 18.

FIG. 6 shows a time chart when the eject button 21 is quickly operated. At this time, TBK≈T
Since S <TM, regardless of whether or not the magnetic disk 11 has reached the second deceleration time t2 (FIG. 4), the PWM detection signal and the REV signal are output at the closing operation of the ejection detection switch 20. Stop.

FIG. 7 shows a time chart when the eject button 21 is operated slowly and the magnetic disk 11 does not slow down easily. In this case, TBK≈TM <TS
Therefore, the timer of the controller 18 provided as a safety measure operates, and the output of the PWM signal and the REV signal is stopped when the count time TM of the timer has elapsed.

In the case of the VFDD of the above-mentioned embodiment, the break time slightly changes due to the voltage fluctuation of the power supply voltage Vbb, the break time becomes short when the power supply voltage level is high, and the break time is lowered when this voltage level falls. The time becomes longer.
However, since it is necessary to apply a sudden break, it is preferable to perform the break operation within a constant extremely short time regardless of the fluctuation of the power supply voltage.

In order to solve this point, FIG. 8 shows an embodiment in which the break time is kept constant irrespective of fluctuations in the power supply voltage. The potentiometer is used when the eject button 21 is slid. The detection signal (BS signal) of the power supply voltage Vbb detected by 22 is input to the controller 18,
The controller 18 is so constructed as to change the pulse width of the PWM signal according to the BS signal. Others are the same as the block diagram shown in FIG.

In this embodiment, as shown in FIG. 9 as an example, the power supply voltage level is divided into 9 V or more, 8 to 9 V, 7 to 8 V, and 7 V or less, and PWM.
Change the pulse width of the signal. The modulation of the pulse width is performed after the controller 18 inputs the EJC signal.

With this configuration, the motor drive circuit 12 is braked so as to have a constant reverse torque regardless of whether the power supply voltage level is high or low, so that it is hardly affected by the fluctuation of the power supply voltage. The break time is almost constant.

Although the embodiments relating to the information recording / reproducing apparatus using the magnetic disk as the recording medium have been described above, the same can be applied to the information recording / reproducing apparatus using the optical disk as the recording medium.

[0040]

As described above, according to the present invention, when the recording medium is ejected during its rotation, the rotation of the recording medium is effectively subjected to a rapid break, and this brake is sufficient. Ejects while decelerating, so the magnetic disk is smooth
The information recording / reproducing apparatus has no problem that the hub or the like is discharged and is not damaged. Further, since the information recording / reproducing apparatus of the present invention is not affected by the fluctuation of the power supply voltage, there is no problem that the braking time is long due to the drop of the power supply voltage and the braking is not sufficiently applied. ..

[Brief description of drawings]

FIG. 1 is a block diagram of an electric circuit showing an example in which the present invention is implemented as a VFDD of an electronic still camera.

FIG. 2 is a time chart showing the relationship between an FG signal and a REV signal generated in the breaking process.

FIG. 3 (A) is a simplified diagram showing an eject button and an eject switch. FIG. 3B is an explanatory diagram showing the relationship among the sliding operation position of the eject button, the magnetic disk ejection process, the EJC signal, and the DIS signal.

FIG. 4 is a time chart showing a break operation of the above VFDD.

FIG. 5 is a time chart showing a breaking operation when the eject button is operated slowly.

FIG. 6 shows a blur when the eject button is operated quickly.
It is a time chart showing the operation.

FIG. 7 is a time chart showing a break operation when the eject button is operated slowly and the break time is long.

FIG. 8 is a block diagram similar to FIG. 1, showing an example of a VFDD configured to perform a break operation without being affected by fluctuations in power supply voltage.

FIG. 9 is a pulse waveform diagram showing an example of a PWM signal in which the pulse width is changed according to the power supply voltage level in the break operation.

[Explanation of symbols]

 11 magnetic disk 12 motor drive circuit 13 motor drive circuit 14 magnetic head 15 waveform shaping circuit 16 PG coil 17 signal processing circuit 18 controller 19 eject switch 20 ejection detection switch 21 eject button 22 potentiometer

Claims (2)

[Claims] 1. An information recording / reproducing apparatus having a mechanical ejecting mechanism for ejecting a recording medium such as a magnetic disk recorded or reproduced at a storage position by an eject operation,
A control means for positively rotating the recording medium by inputting a pulse drive signal whose pulse width is modulated according to the FG signal to a motor drive circuit for rotating the recording medium, and an eject operation performed while the recording medium is rotating. In response to an operation, the pulse drive signal is regulated to have a constant pulse width, and
The brake means for inputting a reverse rotation signal to the drive circuit and the rotation speed of the recording medium are detected from the FG signal, and the reverse rotation signal is continued until a predetermined first deceleration time point, and the reverse rotation is performed after the first deceleration time point. An information recording / reproducing apparatus comprising: a break control means for interrupting a signal and thereafter stopping the input of this reverse rotation signal together with a pulse drive signal. 2. The adjusting means for detecting the power supply voltage level, regulating the pulse width of the pulse drive signal according to the detected level, and adjusting the break time. Information recording / reproducing apparatus.