JPH0467348A - Attraction detector for disk - Google Patents

Abstract

PURPOSE:To securely and speedily detect whether a disk is attracted by means of a negative pressure pad or not by actually recording and regenerating a signal for attraction detection in the disk through a magnetic head and judging the presence or absence of the attraction of the disk to the negative pressure pad. CONSTITUTION:When a spindle motor 3 is revolved and driven, a signal record ing means 17 outputs the signal for attraction detection to the magnetic head 2, and the signal for attraction detection is recorded from the magnetic head 2 to the disk 4. When the disk 4 is not attracted to the negative pressure pad, the signal for attraction detection cannot be recorded in the disk 4. Detection means for attraction detection signal 20-24 detect the signal for attraction detec tion. When the detection output of the signal for attraction detection is generat ed, a judgement means 11 judges that the disk is attracted to the negative pressure pad. Thus, the signal for attraction detection is actually recorded and regenerated and the presence or absence of attraction can be detected. Thus, the presence or absence of attraction can securely and speedily be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a disk suction detection device that suctions a flexible disk using a negative pressure pad and detects the presence or absence of suction.

<Prior Art> Conventionally, information is stored on a magnetic disk, which is a flexible sheet-like magnetic recording medium, such as in a video floppy disk drive for recording/reproducing still images or recording/reproducing data. There is a magnetic disk drive device that performs recording/reproduction. This device uses a floppy disk (hereinafter referred to as
It is important to bring the disk (hereinafter referred to as a disk) into stable contact with the magnetic head.

As shown in FIG. 10, a negative pressure pad 1 is provided around the magnetic head 2 to fix the magnetic head 2 through an adhesive so that a concave portion 1a is formed around the magnetic head 2, and a spindle motor 3 drives the disk 4. A method is becoming mainstream in which a stable head touch is obtained by suctioning the disc 4 with the negative pressure generated by the air flow accompanying the rotation of the disc 4 in the concave portion 1a of the negative pressure pad 1 when the disc 4 is rotated.

However, in order to suction the disk 4 in this method, the distance between the disk 4 and the negative pressure pad l must be less than a predetermined distance, but if the curl amount Δd of the disk 1 exceeds the predetermined distance, negative pressure will be generated. If it does not occur, or even if it occurs, the absolute level is too small to pull the disk 4 up to the negative pressure pad 1.

As a countermeasure against this, as shown in FIG.
is provided, and when the disk 4 is inserted in the direction of the arrow and the disk 4 is driven to rotate, the regulation plate 6 is used to control the negative pressure pad 1 so that the disk 4 always comes into contact with the negative pressure pad 1, as shown in FIG. The maximum separation distance Δ by regulating the disk 4 from the facing side of
There are some that are set below d'.

However, in the above-mentioned method of providing the regulating plate 6 and bringing the disc 4 into contact with the negative pressure pad 1, the distance between the regulating plate 6 and the disc 4 is on the order of several tens of microns, so the installation of the regulating plate 6 requires mechanical adjustment. A mechanism is necessary. Therefore, the number of parts increases, the drive unit itself becomes larger, and the number of assembly steps increases, which may increase production costs.

Therefore, without using the regulating plate 6, the disc 4 is moved to the negative pressure pad 1.
The disc suction detection device detects whether or not the disc is being suctioned, and if it is not suctioned, an alarm is displayed in electronic still cameras, for example, and the shutter button cannot be pressed to notify the photographer. (Refer to Japanese Utility Model Application Publication No. 64-3'7956, etc.).

This takes advantage of the fact that the drive current value increases when the disk 4 is attracted to the negative pressure pad 1.
The drive current value supplied to the spindle motor 3 is converted into a voltage value, and the converted voltage value is compared with a predetermined reference voltage while the rotation is servo-locked. If it is less than the reference voltage, the disk 4 is activated. This is detected by determining that there is no suction to the negative pressure pad l.

<Problems to be Solved by the Invention> By the way, in the conventional disk attraction detection device, the method of detecting attraction by detecting the drive current has the following problems:
The drive current changes depending on various conditions such as variations in the disk 4, track position of the disk 4, temperature, spindle motor 3, etc., and if the voltage converted from the drive current is uniformly compared with the reference voltage, an incorrect judgment will be made. There is a risk.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a disk suction detection device that can reliably detect whether or not the disk 4 is being sucked by the negative pressure pad l.

<Means for Solving the Problems> Therefore, the present invention provides a method for detecting whether or not a flexible disk is attracted to a negative pressure pad provided integrally with a magnetic head when it is rotationally driven by a spindle motor. The attraction detection device for a disk includes a signal recording means for recording an attraction detection signal on the disk via a magnetic head, and an attraction device for detecting the attraction detection signal recorded on the disk via the magnetic head. 1. detection signal detection means; determination means for determining that the disk is being attracted to the negative pressure pad when the suction detection signal detection means generates a detection output of the suction detection signal; 1. Equipped with

<Operation> According to this configuration, when the spindle motor is rotationally driven, the signal recording means outputs the attraction detection signal to the magnetic head, and the attraction detection signal is recorded from the magnetic head to the disk. At this time, if the disk is not attracted by the negative pressure pad, it is not possible to record a suction detection signal on the disk.

The suction detection signal detection means detects the suction detection signal. When the detection output of the suction detection signal is generated, the determining means determines that the disk has been suctioned by the negative pressure pad. Therefore, since the suction detection signal is actually recorded and reproduced to detect the presence or absence of suction, the presence or absence of suction can be detected reliably and quickly.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 9. Incidentally, the same elements as in FIGS. 1O to 12 are given the same reference numerals and their explanations will be omitted.

In FIG. 1 showing the first embodiment, a spindle motor 3 that rotationally drives a flexible disk 4 has a rotational speed feedback side wJ ( It is driven by a spindle servo drive circuit 12 equipped with a servo control mechanism. A system controller (hereinafter referred to as system controller) 11 serving as a determination means includes a microcomputer including a CPU, ROM, RAM, and an input/output interface, and sends a signal MTON to the spindle servo drive circuit 12.
is output to start the spindle motor 3. The spindle motor 3 has a built-in frequency generator (FG) that outputs a pulse signal that is a rotation detection signal based on the rotation speed.
A rotation detection signal for servo control is output to the spindle servo drive circuit 12 via the rotation detector 13. Also, when the rotation or servo is locked, the spindle servo drive circuit 12
outputs a servo lock signal SL to the system controller 11.

Switch SWI for switching input/output signals of magnetic head 2
is equipped with a PB terminal for playback mode, an RFC terminal for record mode, and an ERA terminal for erase mode.
Switches SWI, PB, REC, and E are activated by commands from 1.
When switched to the RA terminal side, the magnetic head 2 corresponds to the input terminal of the reproduction amplifier 14 and the recording amplifier 15.
The output terminal of the erase circuit 16 is connected to the output terminal of the erase circuit 16.

In addition, a switch S for switching the input signal of the recording amplifier 15
W2 is provided with an a terminal for inputting a video signal and a b terminal for inputting a signal from the oscillator 18, and when the switch SW2 is switched to the a or b terminal side by a command from the system controller 11, the recording amplifier 15 responds accordingly. The output terminal of the recording signal processing circuit 17 which inputs a video signal and the output terminal of an oscillator 18 which outputs a signal of a predetermined frequency are connected. Note that the recording signal processing circuit 17 and the oscillator 18 correspond to a suction detection signal recording means, and the suction detection signal corresponds to a video signal and an output signal of the oscillator 18.

When recording the output signal of the oscillator 18 on the disk 4, the switch SWI,2 is switched to the RFC terminal side and the b terminal side, respectively, by a command from the system controller 11, thereby connecting the oscillator 18 and the magnetic head 2. In between, from the oscillator 18 side, the b terminal of switch SW2, the recording amplifier 1
5. A circuit is constructed in which the RFC terminals of the switch SW1 are connected in series, and a signal of a predetermined frequency from the oscillator 18 is recorded on the disk 4 via the magnetic head 2.

When recording video signals on disk 4, switch SWI
, 2 is on the RFC terminal side according to the command from the system controller 11,
The a terminals of the switch SW2, the recording amplifier 15, and the REC terminal of the switch Swl are connected between the recording signal processing circuit 17 and the magnetic head 2 in order from the recording signal processing circuit 17#. A series-connected circuit is constructed, and a video signal is recorded on the disk 4.

In addition, when reproducing signal information recorded on the disk 4, the switch SWI is set to P by a command from the system controller 11.
The magnetic head 2 is switched to the B terminal side, thereby connecting the magnetic head 2 to the input end of the reproduction amplifier 14. Further, a reproduction signal processing circuit 19 is connected to the output terminal of the reproduction amplifier 14 for reproduction processing as a video signal. Further, between the output terminal of the regenerative amplifier 14 and the system controller 11, a bandpass filter 20, which is a filter that allows only a signal of a predetermined frequency outputted from the oscillator 18 to pass, and an envelope potential signal, which is a circuit for extracting an envelope potential signal, are connected in sequence. A take-out circuit (hereinafter referred to as an envelope take-out circuit) 21 and an A/D conversion circuit 22 are connected in series, and an envelope take-out circuit 23, A is connected in parallel with the series circuit between the reproduction amplifier 14 and the system controller II. /
A D conversion circuit 24 is connected in series.

If information for a video signal is recorded on the disk 4, the signal information, for example in the case of an electronic still video, is reproduced through a reproduction signal processing circuit 19, outputted as a video signal, and outputted to a reproduction amplifier. 14 through the envelope extraction circuit 23 and the A/D conversion circuit 24, the A/D converted signal V Rl! C is output to the system controller 11. Further, if only the output signal of the oscillator 18 is recorded on the disk 4, the output signal of the oscillator 18 is transferred to the bandpass filter 2.
Envelope removal circuit 21 from o. A/D conversion circuit 22
The A/D converted signal V1. Nv is Cisco 1
1 is output. Note that the bandpass filter 20, the envelope extraction circuit 21, the A/D conversion circuit 22, the envelope extraction circuit 23, and the A/D conversion circuit 24 correspond to the suction detection signal detection means.

When erasing the signal information recorded on disk 4,
The switch SWI is switched to the ERA terminal side by a command from the system controller 11, an AC signal for erasing is outputted from the erasing circuit 16, and the signal information recorded on the disk 4 via the magnetic head 2 is erased.

The system controller It outputs the signal MToN to start up the spindle motor 3, and then outputs the signals V□7 and V□.

The suction of the disk 4 to the negative pressure pad l is determined by monitoring whether or not is input.

Next, the operation of the system controller 11 will be explained based on the flowchart shown in FIG.

In step 1 (indicated by "S" in the figure, the same applies hereinafter), the switch SW1 is first switched to the PB terminal side to set the playback mode.

Next, in step 2, the spindle servo drive circuit 12
A spindle motor drive signal is output to drive the spindle motor 3, and in step 3, the servo is locked in this state and waits for the input of the servo lock signal SL.

When the servo lock signal SL is input in step 3, the envelope take-out circuit 23, A/
The presence or absence of input of the signal VREC is checked via the D conversion circuit 24. This is similar to the conventional recorded detection, and if the disc 4 is attracted to the negative pressure pad 1 and signal information is recorded on the disc 4, a reproduction output is generated and the signal V
The presence or absence of RgC input is checked to determine the presence or absence of suction.

In step 4, if the signal V REC is input, it is determined that the disk 4 has been attracted to the negative pressure pad l, and the process proceeds to step lO, where switch SW2 is set to a for the next process.
Return to the terminal side, select the recording mode of the video signal, and set the switch SW1 to the recording/playback mode.
Or switch to the ERA terminal side and proceed to the next step.

If the signal V□0 is not input in step 4, either the signal information on the disk 4 has not been recorded or the disk 4 is not attracted to the negative pressure pad 1.

In that case, the process proceeds to step 5, where the switches SWI and SWI2 are switched to the REC terminal side and the b terminal side, respectively, and in step 6, a signal of a predetermined frequency outputted from the oscillator 18 is recorded on the disk 4 for one revolution, for example.

Next, in step 7, the switch SWI is switched to the PB terminal side to set the reproduction mode.

Then, in step 8, it is detected whether the signal V If: N Y is input. If the signal V tsv is input here, it is determined that the disc 4 is attracted to the negative pressure pad l and the recording/reproduction to the disc 4 has been performed normally, and the process advances to step 9 to proceed to step 9 for recording the next signal. In step 6, the information of the output signal of the oscillator 18 recorded on the track is erased, and in step 10, the above-described processing is performed.

If the signal VIINV is not input in step 8, it is determined that the disk 4 is not attracted to the negative pressure pad 1, and the process proceeds to step 11, where the rotational speed is increased to further increase the air flow and the disk 4 is moved to the negative pressure pad 1. Either let it be sucked, or display it as "defective" and proceed to the next step.

According to this configuration, before recording and reproducing a video signal, the video signal or the oscillator 1 is
8 is used as a suction detection signal to detect whether or not the disc 4 is suctioned to the negative pressure pad 1.
It is possible to reliably determine the presence or absence of suction without being affected by variations in each part, environmental conditions, and other conditions, and it is also possible to quickly respond to subsequent processing. Furthermore, since it has a configuration that adds almost no parts to the conventional mechanism, and also does not use a disc regulating plate for sucking the disc 4 to the negative pressure pad 1, the drive can be made more compact, and the number of parts and work can be reduced. The number of man-hours can be reduced.

Next, a second embodiment will be explained.

In this embodiment, an erasing alternating current signal from an erasing circuit is used instead of the signal of a predetermined frequency output from the oscillator in the first embodiment.

In FIG. 3 showing the configuration of the second embodiment, a recording amplifier 1
Only the video signal is input to the recording signal processing circuit 5 via the recording signal processing circuit 17, and the oscillator 18 and switch SW2 are omitted from the configuration of the first embodiment shown in FIG.

When recording the AC signal of the erasing circuit 16 on the disk 4,
The switch SWI is switched to the ERA terminal side by a command from the system controller 11, and the AC signal output from the erasing circuit 16 is recorded on the disk 4 via the magnetic head 2.

In addition, when reproducing signal information recorded on the disk 4, the switch SWI is set to P by a command from the system controller 11.
It is switched to the B terminal side, and an AC signal is output from the disk 4 via the magnetic head 2. In this case, the passband of the bandpass filter 200 is adjusted to the frequency of the AC signal of the cancellation circuit 16. As a result, the system controller 11 receives a signal V E
An AC signal from the erasing circuit 16 is input as NV.

The system controller 11 receives signals V It N V and V□. A of
The suction of the disk 4 to the negative pressure pad l is determined by monitoring whether or not the /D conversion value is input.

Next, the determination operation of the system controller 11 will be explained based on the flowchart of FIG.

In step 21, the switch SW1 is switched to the PB terminal side to set the playback mode.

Next, in step 22, the spindle servo drive circuit 1
A spindle motor drive signal is output to 2 to start rotation of the spindle motor 3. In step 23, the servo is locked in this state and waits for input of the servo lock signal SL.

When the servo lock signal SL is input in step 23, the envelope extraction circuit 23,
The signal V is passed through the A/D conversion circuit 24. Check whether C is input.

In step 24, if the signal VIIIC is input, it is determined that the disk 4 is attracted to the negative pressure pad l, and the process proceeds to step 28, where the switch SW2 is switched for the next process.
is switched to the RFC or PB terminal side according to the recording/playback mode.

If the signal Lzc is not input in step 24, the signal information on the disc 4 is unrecorded or the disc 4
is not being sucked into the negative pressure pad 1.

In that case, proceed to step 25 and set switch SWI to ERA.
The switch is switched to the terminal side, and the AC signal of the erasing circuit 16 is recorded on the disk 4 for one rotation, for example.

Next, in step 26, the switch SWI is switched to the PB terminal side to set the reproduction mode.

Then, in step 27, it is detected whether the signals V and v are input. If the signal V2o is input here, it is determined that the disc 4 is attracted to the negative pressure pad l and the recording/reproduction to the disc 4 has been performed normally, and the process proceeds to step 28, where the switch SWI is turned to RFC, PB according to the next mode. Switch to the terminal and proceed to the next step.

If the signal VE N V is not input in step 27, it is determined that the disk 4 or the negative pressure pad l has not been sucked, and the process proceeds to step 29, where the rotational speed is increased and the airflow is further increased to apply negative pressure to the disk 4. Either the pad 1 is caused to attract the disc, or the power supply to the spindle motor 3 is turned off, and a display indicating that it is a defective disc with a large curl amount Δd is displayed, and the process proceeds to the next step.

According to this configuration, the signal of the oscillator 18 is transmitted to the erasing circuit 16.
By substituting an AC signal for cancellation and matching the passband of the bandpass filter 20 to the frequency of this AC signal, it is possible to reduce the number of hardware components such as the oscillator 18 and switch SW2, resulting in further miniaturization. . Also, the signal V l
! : After the detection of N Y, there is no need to erase the erasing AC signal recorded on the track, and the determination operation performed immediately before recording and reproducing the video signal is simplified and the time is shortened.

Next, a third embodiment will be described.

This device records and reproduces the suction detection signal on an unstandardized track, and it must be specified for each disc whether it is attracted to the disc or the negative pressure pad. Using this, the presence or absence of suction to the negative pressure pad of the disc is detected only when the disc is inserted.

In FIG. 5 showing the configuration of the third embodiment, a disk detector 25 is attached near the disk 4, and when the insertion of the disk 4 is detected, a disk insertion detection circuit 26 connected to the disk detector 25 is activated. The detection signal FPIN is output to the system controller 11. A head movement controller 27 is also attached to the magnetic head 2. Disk 4 here
In this case, the tracks on which signal recording and reproduction are standardized are from the first track to the 52nd track including the cue track, but signal recording and reproduction are not standardized under the control of the head movement controller 27. The magnetic head 2 can be moved to the 0th track.

The switch SW3 is provided with REC and PB terminals, and is switched to each terminal by a command from the old system controller.

When recording video signals on disk 4, switch S
W3 is switched to the REC terminal side by a command from the system controller 11, and the video signal is sent to the recording signal processing circuit 17, the recording amplifier 15, the RFC terminal of the switch SW3, and the magnetic head 2.
is recorded on the disc 4 via the . Note that, for example, in an electronic still camera or the like, an FM modulated wave is always output from the video signal input terminal, so when no video signal is input, this FM modulated wave may be used as a suction detection signal. In any case, there is no need to create a new signal for suction detection.

When reproducing the signal information recorded on the disk 4, the switch SW3 is switched to the PB terminal side by a command from the system controller 11, so that the signal information recorded on the disk 4 is transferred to the magnetic head 2 and the PB terminal of the switch SW3. ,
It is output as a video signal via the playback amplifier 14 and the playback signal processing circuit 19, and the signal VIINV is also output from the playback amplifier 14 via the envelope extraction circuit 23 to the A/D conversion circuit 24, where it is A/D converted. The signal V is input to the system controller 11.

The system controller 11 receives the signal VE? l and V*tc
(7) Monitor whether the A/D conversion value is input and determine whether the disk 4 is attracted to the negative pressure pad 1.

Next, the determination operation of the system controller 11 will be explained based on the flowchart of FIG.

In step 41, the disk 4 is inserted into the housing 5,
When the signal FP IN is applied from the disk insertion detection circuit 26, a spindle motor drive signal is output to the spindle servo drive circuit 12 in step 42 to drive the spindle motor 3, and the rotation of the spindle motor 3 is started.

In step 43, the head movement controller 27 is controlled to move the magnetic head 2 to the 0th track where signal recording and reproduction are not standardized, and detect the 0th track.

Then, in step 44, the servo is locked in this state and the system waits until the servo lock signal SL is input. When the servo lock signal SL is input, the switch SW3 is switched to the RFC terminal side in step 45, and the video signal is transferred to the disk 4. to be recorded.

Next, in step 46, the switch SW3 is switched to the PB terminal side to set the reproduction mode, and the signal information recorded on the 0th track is reproduced via the magnetic head-2, and the process proceeds to step 47, where the signal information recorded on the 0th track is reproduced. Waits for input of signal V tnv based on information.

If the signal VINv is input in step 47, it is determined that the disk 4 has been attracted to the negative pressure pad 1, and the process proceeds to step 56 to reset the 5PUP flag. Here, the 5PUP flag is a flag set in the system controller 1, and is reset when the signal V or □ is input at the rotation speed at which the rotation is servo-locked, and when the rotation speed exceeds the servo-lock rotation speed, the signal V RN is input. This flag is set to "1" when V is input.

Then, the process proceeds to step 54 to erase the recorded signal information of the O-th track, and in step 55 it is detected that the recording has been completed, and the process proceeds to the next step.

If the signal V is not input in step 47, it is determined that the disk 4 is not attracted to the negative pressure pad I. At this point, since the disc 4 is not attracted to the negative pressure pad 1, neither recording nor playback is possible in this state, and it may be displayed as a defective disc as it is, but the maximum supplyable power is supplied for an even longer period of time. Disk 4 until a higher rotational speed N+max determined by experiment is reached.
As the rotation speed increases, the air flow increases and in almost all cases it is observed that the disc 4 is attracted to the vacuum pad 1.

Therefore, in step 48, the servo lock of the spindle motor 3 is released, and the power supplied to the spindle motor 3 is set to the maximum power that can be supplied, and the spindle motor 3 is turned on until the maximum rotational speed Nm11M, at which almost all the disks 4 are attracted, is reached. Speed up rotation.

Note that the maximum rotational speed N + a li

Then, in step 49, the speed is reduced again to servo drive, and in step 50, wait until the servo is locked, and proceed to step 51, operate the switch SW3 again to perform recording and reproduction, and in step 52, signal V again.
It is determined whether or not ENV has been input.

If here the signal V! If N V is input, it is determined that the disk 4 is attracted to the negative pressure pad 1, and the process proceeds to step 5.
3, the 5PUP flag is set to "1", and the process proceeds to steps 54 and 55, where the above-described processing is performed.

In step 52, if the signal V is not input, it is determined that the disk 4 is not attracted to the negative pressure pad 1 and that no more suction is possible, and the process proceeds to step 57, where power is supplied to the spindle motor 3. off, curl amount Δ
It is displayed that it is a defective disk with a large value d, and the process proceeds to the next step.

The above determination operation is performed only when the disk 4 is inserted into the housing 5, and the next time the rotation of the spindle motor 3 is started, the presence or absence of suction is equivalently determined by referring to the 5PUP flag. .

Whether or not this is suctioned by the negative pressure pad 1 is specified for each disk, so if the above-described determination of suction is made when the disk 4 is inserted into the housing 5, the spindle motor 3 This is because the disc 4 can be attracted to the negative pressure pad 1 by performing the same process each time the rotational speed is increased, without having to make the same determination as to whether or not suction is present.

Therefore, if the 5PUP flag is "0", it is determined that the disk 4 is attracted to the negative pressure pad 1 until the rotation speed reaches the servo lock frequency, and the spindle motor 3 is started to rotate at the servo lock frequency. As soon as the rotational speed is reached, control is performed at that rotational speed. Also 5PU
If the P flag is rlJ, it is determined that the disk 4 will be attracted to the negative pressure pad l once the rotational speed of the spindle motor 3 is increased to N1.8, and the spindle motor 3
Once the rotational speed is Nm a! Rotate at high speed until then reduce the rotation speed to the servo lock frequency.

This operation is repeated until the disk 4 is pulled out from the housing 5.

According to this configuration, by using the 0th track on which the recording and reproducing of signals on the disk 4 are not standardized as the track for recording and reproducing the suction detection signal, the 0th track contains a regular information signal. Therefore, there is no need to select the frequencies of recording and reproduction signals for suction detection. Furthermore, the signal VKNV used to detect the presence or absence of suction is not particularly new because it is recorded in the same band as the regular information signal. It doesn't matter if they are exactly the same. Therefore, no new hardware configuration is required for this configuration. In addition, the presence or absence of suction is checked only when the disk 4 is inserted into the housing 5, and thereafter, when the spindle motor 3 starts rotating, the presence or absence of suction is determined by referring to the 5PUP flag. , it is possible to save time for detecting the presence or absence of suction. Furthermore disk 4
When the disc 4 is inserted into the housing 5, there are various tasks such as recording completion detection and initial position detection, so the time required to detect the suction state of the disc 4 to the negative pressure pad 1 is also worth ignoring.

Next, a fourth embodiment will be described.

In this case, the rotational speed of the spindle motor when determining the presence or absence of suction is set to a rotational speed lower than the rotational speed of the servo lock frequency, and the servo lock frequency is set after suction is applied to the disk or the negative pressure pad l. By returning to the rotational speed, the determination operation is made more reliable.

In the fourth embodiment, the circuit has the same configuration as that shown in FIG. 5, and the system controller 11 performs the determination operation based on the flowchart shown in FIG.

In step 61, the disk 4 is inserted into the housing 5,
When the signal FP IN is input from the disk insertion detection circuit 26, in step 62, the rotational speed of the spindle motor 3 when the normal servo is locked is set as N.
The rotational speed of the spindle motor 3 when determining the presence or absence of suction is set to Np-α, and the rotation of the spindle motor 3 is started. This is because it has been confirmed that the suction force of the disk 4 to the negative pressure pad 1 is proportional to the rotational speed, and by lowering the rotational speed when detecting the suction state, a margin can be provided.

In step 63, the head movement controller 27 is controlled to move the magnetic head 2 to the O-th track.

Then, in step 64, the servo is locked in this state and waits until the servo lock signal SL is input, and when the servo lock signal is input, the switch SW3 is switched to the REC terminal side in step 65 to record the video signal on the disk 4. do.

Next, in step 66, the switch SW3 is switched to the PB terminal side to set the reproduction mode, and the signal information recorded on the 0th track is reproduced via the magnetic head 2, and in step 6
Step 7 waits for input of signal V INV.

In step 67, if the signal V t! When NV is input, it is determined that the disk 4 has been sucked into the negative pressure pad 1, and the process proceeds to step 77, where the 5PUP flag is reset. Note that the 5PUP flag is the same flag as in the third embodiment.

Then, the process proceeds to step 74, where the controlled rotational speed of the spindle motor 3 is returned to N, which is the rotational speed of the servo lock frequency, the signal information recorded in the O-th track is erased in step 75, and the recorded information is detected in step 76. and proceed to the next step.

If the signal VENV is not input in step 67, it is determined that the disk 4 is not attracted to the negative pressure pad 1.

Therefore, in step 68, the servo lock of the spindle motor 3 is released, the power supplied to the spindle motor 3 is set to the maximum power that can be supplied, and the maximum rotational speed N5aa is set at which almost all the disks 4 are attracted. The rotation speed of the spindle motor 3 is increased until the rotation speed of the spindle motor 3 is increased.

In step 69, the rotational speed is reduced again, and in step 70, the process waits until the rotational speed reaches (N, -α), and then proceeds to step 71.

In step 71, the switch SW3 is switched to the RFC terminal side to record the video signal on the disk 41, and then the switch SW3 is switched to the PB terminal side, and the process proceeds to step 72 to check whether the signal V is input. .

If the signal V is input in step 72, it is determined that the disk 4 has been attracted to the negative pressure pad 1, and the process proceeds to steps 73 to 76 to perform the above-mentioned processing.

Further, if the signal V I N V is not input in step 72, the disk 4 will not be attracted to the negative pressure pad l, and it will be determined that no more suction is possible, and the process will proceed to step 78, where power to the spindle motor 3 will be turned off. The supply is turned off, a display indicating that the disk is a defective disk with a large curl amount Δd, and the process proceeds to the next step.

Then, in step 76, a recorded state is detected, and the process proceeds to the next step.

If the signals V and □ are not input in step 67, it is determined that the disk 4 is not attracted to the negative pressure pad 1, and the process proceeds to step 68, where the spindle motor 3 is rotated at a high speed up to Nma.

In the fourth embodiment, as in the third embodiment, the above judgment operation is performed only when the disk 4 is inserted into the housing 5.
Next, when starting up the rotation of the spindle motor 3,
The presence or absence of suction is determined isometrically by referring to the PUP flag.

According to this configuration, the rotational speed of the spindle motor 3 when determining whether or not the disk 4 is attracted to the negative pressure pad 1 is set to a rotational speed lower than the rotational speed at which the servo is normally locked. By returning the rotational speed to the rotational speed of the regular servo lock frequency when it is attracted by the negative pressure pad l, a margin can be maintained even if there are variations in suction for the disk 4 that is attracted near the servo lock frequency. Detecting the presence or absence of suction only from the 5PUP flag is no longer dangerous, and the 5PUP
The reliability of the determination operation based on the UP flag can be improved.

Next, a fifth embodiment will be explained.

This device detects recorded tracks by moving the magnetic head sequentially from the outermost track toward the inner circumference, and always positions the magnetic head on the innermost track of the recorded tracks. .

The circuit in the fifth embodiment is also similar to the configuration shown in FIG.

The system controller 11 performs a determination operation based on the flowchart shown in FIG.

First, when the disk 4 is inserted into the housing 5, the system controller 11 performs a determination operation based on the flowchart shown in FIG.

In step 91, the disk 4 is inserted into the housing 5,
When the signal FPIN is input from the disk insertion detection circuit 26, a spindle motor drive signal is output to the spindle servo drive circuit 12 in step 92 to start the rotation of the spindle motor 3.

In step 93, the head movement restrictor 27 is controlled to move the magnetic head 2 to the 0th track.

Then, in step 94, the servo is locked in this state and waits for the servo lock signal SL to be input.
When the servo lock signal SL is input, the process proceeds to step 95, where the switch SW3 is switched to the REC terminal side and the video signal is recorded on the disc 4.

Next, in step 96, the switch SW3 is switched to the PB terminal side, and in step 97, the input of the signal VRNV based on the signal information recorded in the 0th track is awaited.

In step 97, if the signal ■[lNV is input, it is determined that the disk 4 is attracted to the negative pressure pad 1,
Proceeding to step 98, all recorded tracks are detected.

Then, in step 99, the magnetic head 2 is moved to the innermost track of the recorded tracks, and the process proceeds to the next step.

If the signal V is not input in step 97, it is determined that the disk 4 is not attracted to the negative pressure pad l, and in step lOO the rotational speed of the spindle motor 3 is rotated at a high speed up to N1.8.

Then, in step 101, the rotational speed is again reduced to servo drive, and in step 102, the process proceeds to step 103 until the servo is locked, and the switch SW3 is operated again to record and reproduce the video signal, and in step 104, again. It is determined whether the signal VgNv is input.

If the signal V RN V is input in step 104, it is determined that the disk 4 is attracted to the negative pressure pad l, and the process proceeds to steps 98 and 99 to perform the above-mentioned processing.

If the signal V□7 is not input in step 104, the disk 4 is not attracted to the negative pressure pad 1, and it is determined that suction is no longer possible, and the process proceeds to step 105, where the power supply to the spindle motor 3 is turned off. and curl amount Δd
It will indicate that it is a large defective disk and proceed to the next step.

The operation of the system controller 11 when, for example, the release of an electronic still camera is turned on after the above determination operation is performed will be described based on the flowchart of FIG.

When the release is turned on in, for example, an electronic still camera in step 111, a spindle motor drive signal is output to the spindle servo drive circuit 12 in step 112 to start rotation of the spindle motor 3.

In this state, the servo is locked and waits for input of the servo lock signal SL (step 113).

When the servo lock signal SL is input in step 113, it is checked in step 114 whether signal information is recorded on the track corresponding to the current position of the magnetic head 2 by inputting the signal VENV.

If recorded in step 114, the disk 4
It is determined that the magnetic head 2 is attracted to the negative pressure pad 1, and the process proceeds to step 119, where the magnetic head 2 is moved to the next track.
In step 120, the video signal is recorded and the process proceeds to the next step.

In step 114, if no signal is recorded on the track corresponding to the current position of the magnetic head 2, it is determined that the disk 4 is not attracted to the negative pressure pad l;
In step 115, the rotational speed of the spindle motor 3 is increased to N1.8.

Then, in step 116, the rotational speed is lowered again to servo drive, and after waiting for servo lock in step 117, the process proceeds to step 118, where signal information is again recorded on the track corresponding to the current position of the magnetic head 2. Check to see if there is one.

If signal information is recorded in the track corresponding to the current position of the magnetic head 2 in step 118, it is determined that the disk 4 is attracted to the negative pressure pad l, and the process proceeds to steps 119 and 120, where the above-mentioned processing is performed. .

Further, if the signal information is not recorded in step 118, it is determined that the disk 4 is not attracted to the negative pressure pad 1 and that no more suction is possible, and the process proceeds to step 121, where the power supply to the spindle motor 3 is turned off. , it is displayed that it is a defective disk with a large curl amount Δd, and the process proceeds to the next step.

According to this configuration, when the disk 4 is inserted into the housing 5, the presence or absence of attraction is determined, and by always positioning the magnetic head 2 on the recorded innermost track, video signals are transferred to the disk 4. can save recording time. Furthermore, a new signal is recorded only when the disk 4 is inserted into the housing 5, and from then on, the actual recorded information signal is used instead, which reduces the number of additional parts.

<Effects of the Invention> As explained above, according to the present invention, by detecting the attraction detection signal, the attraction detection signal is actually recorded and reproduced on the disk via the magnetic head, and the negative pressure of the disk is reduced. Since the presence or absence of suction to the pad is determined, it is possible to reliably and quickly detect whether or not the disk is attracted to the negative pressure pad, thereby improving the performance of the disk suction detection device.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing the configuration of a first embodiment according to the present invention, FIG. 2 is a flowchart showing the operation of the system controller in FIG. 1, and FIG. 3 is a block diagram showing the configuration of a second embodiment according to the present invention. 4 is a flowchart showing the operation of the system controller in FIG. 3; FIG. 5 is a block circuit diagram in the third embodiment of the present invention; FIG. 6 is a flowchart showing the operation of the system controller in FIG. FIG. 7 is a flowchart showing the operation of the system controller in the fourth embodiment according to the present invention, and FIGS. 8-9 are flowcharts showing the operation of the system controller when the disk is inserted into the negative pressure pad in the fifth embodiment according to the present invention. 10 is a sectional view of a conventional floppy disk device, FIG. 11 is a perspective view of a conventional floppy disk device, and FIG. 12 is a sectional view of a floppy disk device using a conventional regulating plate. l... Negative pressure pad 2... Magnetic head 3...
・Spindle motor 4...Disc 11...
- System controller 13... Rotation detector 16... Erasing circuit I7... Recording signal processing circuit 18... Oscillator 20... Bandpass filter 2
1.23...Envelope extraction circuit (envelope extraction circuit) 25...Disk detector 26...Disk insertion detection circuit 27...Head movement controller

Claims (1)

[Scope of Claims] A disk suction detection device that detects whether or not a flexible disk is attracted to a negative pressure pad provided integrally with a magnetic head when the disk is rotationally driven by a spindle motor. Signal recording means for recording an attraction detection signal on the disk via a magnetic head; Attraction detection signal detection means for detecting the attraction detection signal recorded on the disk via a magnetic head; A disc suction detection device comprising: determination means for determining that the disc is being attracted to a negative pressure pad when the detection signal detection means generates a detection output of the suction detection signal.