JPH03250474A - Rotary disk device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A: Industrial field of application B: Overview of the invention C: Prior art (Figure 3) D: Problem to be solved by the invention (Figures 4 and 5) E: Means for solving the problem (Figures 1 and 5) Figure 2) F action (Figures 1 and 2) G Example (Figures 1 and 2) H Effect of the invention A Field of industrial application The present invention relates to a rotating disk device, and is applied to a floppy disk device, for example. It is suitable for this purpose.

B. Summary of the Invention The present invention provides a first reference track detection signal obtained by controlling the positioning of a head on a first track on the inner circumference side with respect to the outermost circumference track in a rotating disk device, and a movement control signal for the heudom. When it is detected that the head is to be controlled to move to the outermost track in accordance with
By sending out the second reference track detection signal indicating that the head has been positioned to the outermost track, the position of the outermost track on the rotating disk can always be reliably detected.

C. Prior Art Conventionally, in a floppy disk device, the head is moved to a target recording track on the floppy disk.
For this purpose (hereinafter referred to as seek), a head positioning mechanism driven by a stepping motor is used.

That is, as shown in FIG. 4, in a head positioning mechanism 1 of a floppy disk device, a bed 3 placed on a carriage 2 is moved by a guide bar 4 to tracks TR, -TR, of a disk 5.

1' in a direction perpendicular to the direction (indicated by arrow a).

This carriage 2 is positioned using, for example, a needle screw method, and a needle 6 provided on the carriage 2 is pressed against a V-shaped groove of a screw 8 that is arranged parallel to the kite bar 4 and rotated by a stepping motor 7. This changes the rotation of the stepping motor 7 to linear motion.

The stepping motor 7 is supplied with a first step pulse SPI generated by a floppy controller (not shown) in response to a seek command input from a host computer (not shown) and a direction signal 5Djl representing the direction of the seek. is man-powered.

This first step pulse SFI has a pulse waveform that rises and falls at predetermined intervals according to the number of tracks to be sought, and the direction signal 5D11 has a logic r It is designed to have the HJ level, and to have the logic "L" level when seeking toward the outer circumference (this is called step-out).

In reality, the stepping motor 7, as shown in FIG.
For each step of the first step pulse SP+ (FIG. 4(A)), a direction signal S is generated. In this head positioning mechanism 1, the first step pulse is rotated by a predetermined angle (for example, 1.8 degrees) in a predetermined rotation direction depending on the positioning accuracy of the stepping motor 7. The head 3 sequentially moves by one track TR for each step in S6 (shown by a solid line in FIG. 4(C)).
.

In this head positioning mechanism 1, the maximum speed is 1
The head 3 is designed to be able to seek at a step rate of 3 (msec) for each track.

Here, in the head positioning mechanism 1 of the conventional floppy disk device, the head 3 is moved one track T at each step.
Instead of moving the head 3 by R minutes, there is a structure in which the head 3 is moved by one track TR every two steps to improve the head positioning accuracy during seek.

In other words, in this case, as shown in FIG. 4(B), the second step pulse S p 2 ;, the first step pulse SPI input from the floppy controller (not shown), and the predetermined rising time Δτ , a new pulse is generated by synthesizing a new pulse that rises and falls after the lapse of time, and in this way, the head 3 is moved by one track TR every two steps of the second step pulse spz (see FIG. 4(C)).
) to - indicated by the dotted chain line).

Note that in the head positioning mechanism 1 having such a configuration,
For example, the step rate for one track TR controlled from the host computer through the floppy controller is 6.1.
2 (When changing to msecl, the step pulse S0 applied to the stepping motor rises at irregular intervals as shown in FIG. 4(D), and the head 3 moves discontinuously on the track TR accordingly. Figure 4 (F)
), as a result, the damping of the stepping motor becomes large, resulting in a problem of large noise.

In order to solve this problem, the rise time Δτ2 of the new pulse is varied according to the change in the step rate controlled by the host computer, and the pulse rate given to the stepping motor is changed as shown in FIG. Step pulse SP4 of 3 is started at equal intervals, and as a result, the step pulse SP4 shown in Fig. 4 (F
) - It has been proposed that the head 3 is controlled so as to be able to move on a continuous sheet track TR as shown by the dashed line to reduce the noise caused by changes in the step rate ( (Japanese Patent Application Laid-Open No. 63-28296)
.

D Problems to be Solved by the Invention Generally, in a floppy disk device, a ``0'' signal is used to detect that the head 3 is physically positioned on the ``00J track TRo0'' on the outermost periphery of the floppy disk 5.
For example, when a seek error occurs, the head 3 is stepped out from the current track TR to the outermost rack TR0° and this is detected by the "00" track sensor 9. shi,roo
J l-Rack TR,.

A 00'' track detection signal indicating that the spatula 1-''3 has been positioned is transferred to the host computer through the floppy controller.

As a result, from the host computer, for example, a first step pulse SPI for seeking a predetermined track TR head 3 again is inputted through the floppy control section, and thus the head positioning mechanism 1 executes the seek operation again.

Here, the ``OOJ'p rack sensor 9 is a photocoupler 10 made up of a light emitting diode and a phototransistor, and placed at a predetermined position in the floppy disk device housing.
and a blade-shaped shutter 11 provided at a predetermined position on the carriage 2, and the head 3 is located at the outermost ro
When positioned in the rack TR, the shutter 11 cuts off the light emitting diode and phototransistor of the photocoupler 10, and at this time the sensor falls from logic "H" level to logic "L" level. A detection signal S0° is sent out.

Note that in the head positioning mechanism 1 that seeks one track in one step as described above with respect to FIG. 4(A),
This sensor detection signal S0° is directly transferred to the host computer through the floppy controller as a rack detection signal.

On the other hand, in the head positioning mechanism 1 that seeks one track in two steps as described above with reference to FIGS. 4(B) and (D), the rack detection signal generating circuit 12 as shown in FIG. Input the sensor detection signal S0°, and the resulting "OO" track detection signal S.

The UT is transferred to the host computer through the floppy controller.

That is, in this "00" track detection signal generation circuit 12, the first step pulse S□ is output from the delay circuit 1.
At the same time, the sensor detection signal S0° is input to the input terminal of the flip-flop 12B.

Further, from the delay circuit 12A, a delayed pulse signal S is obtained by delaying the first step pulse SPI by a predetermined time Δτ3.
PD is output and is input to the clock end of flip-flop 128.

From this, the flip-flop 12B latches the sensor detection signal S0° at the time 1+ (FIG. 4 (F)) 1' timing delayed by a predetermined time Δτ3 from the rise of the first step pulse SPI, and this is output. The ``00'' track detection signal 5OtlA is sent out through the terminal Q.

However, in the head positioning mechanism l having the "00" track detection signal generating circuit 12 having such a configuration, the rise time Δτ2 of the new pulse is varied in accordance with the change in the step rate, as described above in FIG. 4(E). In this case, the sensor detection signal S0° is the first step pulse SF
The time point delayed by a predetermined time Δτ3 from the rise of I also falls from the logic "H" level to the logic "L" level at the timing t2, which is further delayed by a predetermined time Δτ4, and as a result, the "00" track detection signal s ou
There is a problem that y cannot be generated.

When such a problem occurs, the head 3 moves to the outermost track TR on the floppy disk 5.

The risk of further step-out and damage to the head 3 itself or the floppy disk 5 could not be avoided.

The present invention has been made in consideration of the above points, and no matter how the head is controlled with respect to the tracks on the rotating disk, it is possible to accurately detect that the head is positioned on the outermost track. This paper attempts to propose a rotating disk device.

8 Means for Solving the Problems In order to solve the problems, in the present invention, the outermost track TRo of the rotating disk-shaped recording medium 5 is used. The head 3 is placed on the first track TR, which is on the inner circumferential side by a predetermined distance.
to control the positioning of the first reference track detection signal Set
The first reference track detection signal Sol and the movement control signal SF! for the head 3 are sent out. , 5D11, the head 3 is moved to the outermost track T Ro. Detecting whether movement control is to be performed to the outermost track TR,. When it is detected that the head 3 is to be moved to the outermost trough '7T
By predicting the timing of positioning control at RO0, the outermost track TRo is activated. The head 3 is moved in accordance with the first reference track detection signal S01 obtained by controlling the positioning of the head 3 on the first track TRo+ on the inner circumference side and the movement control signals SFI and SDI+ for the head 3. Outermost track TR. When it is detected that the head 3 will be controlled to move to the outermost track TR0°, it predicts the timing at which the head 3 will be controlled to position to the outermost track TR0°, and moves the head 3 to the outermost track TR0°.
,. By sending out the second reference track detection signal 5QLITI indicating that the head 3 has been positioned, it is always possible to ensure that the outermost track T Ro on the rotating disk-shaped recording medium 5 is detected. can detect the position of.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, in which parts corresponding to those in FIG.
is 1 compared to the conventional "00" track sensor 9.
Track TR is placed on the floppy disk 5 side,
As a result, a "01" track sensor 22 is formed by the photocoupler 21 and the shutter 11 on the carriage 2.

Therefore, in this rObl-rack sensor 22,
Head 3 is the outermost rOOJ) rack TR,. from l
When the shutter 11 is positioned at the "01" track TR, which is on the inner circumferential side by the track TR, the shutter 11 is connected to the photocoupler 21.
The light emitting diode of
The sensor detection signal S falls to the `` level. Send I.

In this embodiment, the head positioning mechanism 20 is configured to seek one track in two steps as described above with reference to FIG. 4(D), and the sensor detection signal S is set. I
is the “00yo track detection signal generation circuit 24” shown in FIG.
, thereby responding to the sensor detection signal S 01 ) rack detection signal S. It is designed to obtain Ua.

Actually, in this 700'' track detection signal generation circuit 24, the first step pulse S, (FIG. 4(A))
is input to the delay circuit 25, and the sensor detection signal 301 is input to the input end of the first flip-flop 26.

Also, from the delay circuit 25, the first step pulse SF
A pulse signal 5FI)1 obtained by delaying I by a predetermined time is output and inputted to the clock terminal of the first flip-flop 26, whereby the sensor is activated at a timing delayed by a predetermined time from the rise of the first step pulse S□. Detection signal S. I is latched and sent to the NAND circuit 27 through the inverted output end of the first flip-flop 26.

In addition to this, the direction signal S□ is inverted by an inverter 28 and inputted to this NAND circuit 27, and as a result, the NAND circuit 27 causes the head 3 to step out.
and the first flip-flop 26 outputs the sensor detection signal SO.
The logic "L" level of I is latched only when the logic "L" level of I is latched.
'' level, which is sent to the input end of the second flip-flop 29.

The clock terminal of this second flip-flop 29;
The logic output of the NAND circuit 27 is latched at the timing of the first step pulse SPI sought from the IJ h rack T Ro + to another track TR.

In this way, in this "00" track detection signal generation circuit 24, the head 3 is rol, ) rack TR,
, to roOJ) rack TR,. It is predicted in advance that it will be sought out to r00J l-rack TR,. R indicates that the head 3 is under positioning control.
oo, track detection signal S. Send LITI to the floppy controller.

Thus, the floppy controller receives the track detection signal S for a predetermined period of time. Delay and forward the UTI to the host computer. Note that when a step-in seek command is transferred from the host computer in this state, the floppy control section simultaneously transmits the rooJ track detection signal S to the host computer. When LITI is raised to the logic rH level and a step-out seek command is transferred, the floppy controller ignores this and outputs the rack detection signal S to the host computer. Ij□ also maintains the logic "L" level.

According to the above configuration, "00" track TR. The sensor detection signal Sol obtained by detecting that the head 3 is positioned on the inner circumferential side rOl, ) rack TRo+
When it is detected that the head 3 seeks to the "00" track TR0° in response to the step pulse SPI to step out, the head 3 moves to the "00" track TR,
. By predicting the timing of positioning, rooJ
) Rack detection signal S. Even if the step rate is changed by sending out Ua,
Always reliably track ``00'' on floppy disk 5
,. It is possible to realize a floppy disk device that can detect the position of the floppy disk.

Furthermore, according to the above configuration, the "00" track detection signal S. By being able to send the UTI after an arbitrary period of time has elapsed from the step pulse S8, the limit step rate can be increased to the rotation accuracy of the stepping motor, thus realizing a floppy disk device that can be accessed at much higher speeds.

Conversely, if you set the same step rate as before, -
A stepping motor with a much simpler configuration can be used, and the usefulness of the floppy disk device can be further improved.

Furthermore, according to the above configuration, r
ob, ) rack, roll l-rack and '00
'' It is possible to realize a floppy disk device that can effectively prevent errors from occurring even during special calibration plate operations such as seeking to a track.

In the above-mentioned embodiment, the rOIJ l-rack sensor was constructed with a photocoupler and a gloss provided on the carriage, but the present invention is not limited to this, and other sensor means such as a microswitch or a laser beam may be used. Also good.

Furthermore, in the above-mentioned embodiment, a case has been described in which the "01" track is detected, but instead of this, even if a predetermined track on the inner circumferential side is detected, the same effect as in the above-mentioned embodiment can be obtained. realizable.

Furthermore, in the above embodiment, a case was described in which a needle screw type head positioning mechanism was used, but the application may also be applied to a floppy disk device using a head positioning mechanism such as a steel belt type or a spiral cam type instead. obtain.

Further, in the above-described embodiments, the case where the present invention is applied to a floppy disk device has been described, but the present invention is not limited to this, but can be broadly applied to rotating disk devices having a head positioning mechanism controlled by a stepping motor. It is suitable for this purpose.

H Effects of the Invention As described above, according to the present invention, the first reference track detection signal and the movement control signal for the head obtained by controlling the positioning of the head on the first track on the inner circumference side with respect to the outermost circumference track. When it is detected that the head is to be controlled to move to the outermost track in accordance with By sending out the reference track detection signal No. 2,
A rotating disk device that can always and reliably detect the position of the outermost track on a rotating disk-shaped recording medium can be realized.

[Brief explanation of drawings]

FIG. 1 is a route map showing an embodiment of a floppy disk device according to the present invention, FIG. 2 is a block diagram showing its "OO" track detection signal generation circuit, and FIG. 3 is a route map showing a conventional floppy disk device. , Fig. 4 is a timing chart for explaining its operation, and Fig. 5 is a conventional rOOJ)
FIG. 2 is a block diagram showing a rack detection signal generation circuit. 1.20...Head positioning structure, 3...
...Head, 5...Floppy disk, 7...
...Stepping motor, 9...Voo-
Nidrak sensor, 12.24...1-OO"
Track detection signal ordering circuit, 22-・----rolj
Track sensor, TR, TR, -TR79...
··truck.

Claims (1)

[Scope of Claims] Controlling the positioning of a head to a first track on the inner circumference side by a predetermined distance with respect to the outermost track of a rotating disk-shaped recording medium, and transmitting a first reference track detection signal; detecting whether to control the movement of the head to the outermost track in accordance with a reference track detection signal and a movement control signal for the head, and detecting that the head should be controlled to move to the outermost track;
The timing at which the head is positioned on the outermost track is predicted, and a second reference track detection signal indicating that the head is positioned on the outermost track is transmitted. Rotating disk device.