JPH01311478A - Access control automatic adjustment method - Google Patents

Abstract

PURPOSE:To automatically set the maximum speed of a magnetic head and final speed to a targeted track without assistance by adjusting the gains of the differentiation signal of a position signal and a track crossing pulse signal by detecting the speed of the magnetic head by a positioning circuit. CONSTITUTION:When the start of automatic adjustment is set on the positioning circuit, a microprocessor 6, after setting gain controllers 7 and 8 at initial gain values, starts the access operation of the magnetic head. At this time, the processor 6 recognizes the speed of the magnetic head by the cycle of the track crossing pulse signal inputted at every passage of a track, and decides whether or not the speed is set at prescribed high speed. When the decision shows that the prescribed high speed is not applied, the gain of the controller 7 is adjusted corresponding to the speed, and such adjustment is repeated until the prescribed high speed can be obtained. Next, the processor 6 measures the maximum speed to the targeted track, and detects the maximum speed of the magnetic head and the final speed to the targeted track based on the signal 3 generated at every passage of the track by performing the access operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an access control method, and particularly to an access control method suitable for a magnetic head positioning circuit for a magnetic disk device.

[Conventional technology]

Generally, a magnetic disk drive is equipped with a positioning circuit that positions the magnetic head to a target track on the magnetic disk, and this positioning circuit moves the magnetic head to the target track at high speed (seek) and stops at the target track in a short time after moving. Therefore, the speed of the magnetic head is controlled. Specifically, the positioning circuit increases the maximum seek speed to minimize the access time due to acceleration/constant speed/deceleration of the magnetic head, and also puts the magnetic head in a state where data can be recorded and reproduced on the target track. In order to minimize the time it takes to stop, the speed of the magnetic head is controlled to lower the speed at which it enters the target track (final speed).

As is clear from FIG. 6 showing its configuration and FIG. 7 showing each signal waveform, the positioning circuit according to the prior art differentiates the position signal 1 obtained by the movement of the magnetic head over the magnetic disk. A differentiator 5, an analog switch 4 that allows the differential signal 13 from the differentiator 5 to pass only for a valid period specified by a selector signal 41, and a variable resistor 11 that limits the differential active component signal 14 that has passed through the switch 4. and a variable resistor 12 that limits the carriage control signal 2 given to a drive mechanism such as a voice coil motor that drives the magnetic head and synthesizes it with the limited differential effective component signal 14, and integrates this synthesized signal. The maximum speed of the magnetic head is set by adjusting the resistance value of the variable resistor 11, and the maximum speed of the magnetic head is set by adjusting the resistance value of the variable resistor 12. It is configured to set the final velocity of the head. Further, these adjustments have been made manually using the variable resistors 11 and 12.

Regarding the positioning circuit technology, Japanese Patent Application Laid-open No. 61-198309 and Japanese Patent Application Laid-Open No. 61-20221
Publication No. 1, etc. can be mentioned.

[3M to be Solved by the Invention] In the positioning circuit according to the prior art described above, the maximum speed of the magnetic head and the gain setting for stabilizing the positioning operation of the magnetic head are manually set, so the setting accuracy is not uniform and the adjustment work is difficult. When it became complicated, it caused many problems.

In addition, although the i-technique described in the above-mentioned publication describes a technique for selecting a speed curve stored in memory and correcting it when the once set magnetic head speed changes due to external factors, there are multiple This requires a memory to store the speed curve, and it is not possible to automatically set the initial gain value.

An object of the present invention is to automatically perform gain adjustment for setting the maximum speed of a magnetic head and the final speed to a target track without human intervention, thereby making the setting accuracy uniform and preventing work complexity. An object of the present invention is to provide an access control automatic adjustment method that can perform automatic adjustment of access control. Another object of the present invention is to provide an access control automatic adjustment method that can perform the speed correction with a simple configuration even when the maximum speed and final speed of the magnetic head change during an access operation of the magnetic head.

[Means to solve the problem]

In order to achieve the above object, the access control automatic adjustment method according to the present invention includes a first gain adjuster that adjusts the gain of a differential signal obtained by differentiating a position signal of a magnetic head, and a gain adjuster that adjusts the gain of a carriage control signal for moving the magnetic head. A second gain adjuster for adjusting and a control means for controlling these gain adjusters, for example a microprocessor, are provided, and the processor controls the gain adjuster as follows.

[For production]

The microprocessor determines the maximum speed of the magnetic head and the target I based on the generation cycle of a track crossing pulse signal generated each time the magnetic head passes a track on the magnetic disk.
- Detecting the final speed to the rack and controlling the first and second gain adjusters so that these maximum and final speeds become predetermined speeds. Further, the microprocessor controls the first and second gain adjusters so that even if the maximum speed and final speed change during the magnetic head access operation for data recording and reproduction, these speeds become predetermined speeds. .

Therefore, the access control automatic adjustment method according to the present invention allows a microprocessor to automatically adjust the maximum speed and final speed of a magnetic head without human intervention, uniformizes setting accuracy, and prevents the complexity of one operation. can do.

Furthermore, the speed correction can be performed with a simple qi configuration even while the device is in operation.

〔Example〕

The access control method according to the present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a positioning circuit to which the access control method according to the present invention is applied, FIGS. 2 and 3 are diagrams for explaining speed detection of a magnetic head, and FIG. and FIG. 5 are diagrams showing the operation flow.

The positioning circuit according to this embodiment is as shown in FIG.
A differentiator 5 for differentiating a position signal 1 obtained from a magnetic head moving on a magnetic disk; an analog switch 4 for passing a differentiated signal 13 from the differentiator 5 only for a valid period specified by a selector signal 41; A gain adjuster 7 adjusts the gain of the differential effective component signal 14 that has passed through the switch 4, and a gain adjuster 7 adjusts the gain of the carriage control signal 2 for driving the magnetic head, and synthesizes it into the gain-adjusted differential effective component signal 14. a microprocessor 6 that controls the gain adjusters 7 and 8, and an integral filter 9 that integrates the combined signal and outputs a speed signal 10.

The gain adjusters 7 and 8 are analog multipliers and D/A
It is configured in combination with a converter or a combination of an analog switch and a resistor to adjust the gain of the human signal.The microprocessor 6 controls the track crossing pulse generated every time the magnetic head passes a track on the magnetic disk. With signal 3 as input, this signal 3
The magnetic head speed is recognized by the period of the signal 3 to control the gain adjuster 7, and the final speed of the magnetic head toward the target 1-rack is measured by the period of the signal 3 to control the gain adjuster 8. It is. The maximum speed is detected by the microprocessor 6 by dividing the predetermined track pitch Tp by the one-track transit time t of the track crossing pulse signal 3 shown in FIG.

The final speed to the target track is detected by using the position signal 1 during the access operation immediately before the positioning operation to the target track (the operation to stabilize the position on the track after moving to the target track), as shown in FIG. It is obtained by detecting the half-cycle time tl.

In this embodiment, the position signal [is a periodic signal obtained by a servo magnetic head moving on a servo track on a servo disk, and has a characteristic that the period changes depending on the moving speed of the magnetic head. There is. The track crossing pulse signal 3 is a pulse signal extracted from the zero crossing point of the position signal 1, but it may also be obtained from a data track, for example.

The operation of this positioning circuit will be explained with reference to the flowcharts shown in FIGS. 4 and 5.

First, in the positioning circuit according to this embodiment, when automatic adjustment start is set, the microprocessor 6 sets the gain adjusters 7 and 8 to a predetermined initial setting gain value in step 100, and then performs gain adjustment in step +01. magnetic head access operation begins. At this time, the microprocessor 6 recognizes the magnetic head speed from the period of the trunk crossing pulse signal 3 inputted every time the track passes, and determines in step 102 whether this speed is a predetermined maximum speed or not. If it is determined in this step 102 that the speed is not the predetermined maximum speed, in the next step 103, if this speed is higher than the predetermined speed, the gain of the gain regulator 7 is lowered in step 104, and if the speed is less than the predetermined speed, the process proceeds to step 105. Then, the gain of the gain adjuster 7 is increased and the process returns to step 102.

This flow is repeated until the magnetic head speed is recognized as the predetermined maximum speed in step 102. When the predetermined maximum speed is reached and the gain adjustment of the gain adjuster 7 is completed, the microprocessor 6 proceeds to the next step 106 to The final speed of the vehicle toward the target track (velocity of entry into the target track) is measured to determine whether or not the final speed is a predetermined final speed. If it is determined in this step 106 that the speed is not the predetermined final speed, then in the next step 107, if this speed is higher than the predetermined final speed, the gain of the gain regulator 8 is lowered in step 108, and if the speed is less than the predetermined speed, step At step 109, the gain of the gain adjuster 8 is increased and the process returns to step 106.

In step 106, the final speed toward the target track is determined to be the predetermined speed. This flow converges, and the adjustment of the gain adjusters 7 and 8 is completed.

If the operation of this positioning circuit is to be monitored while the apparatus is in operation, as shown in FIG. If the speed is higher than a predetermined speed, the difference is calculated in step 201, and then the difference is calculated in step 20.
In step 2, the gain adjusters 7 and 8 are adjusted. If the speed is less than a predetermined speed, the difference is calculated in step 203, and then the gain adjusters 7 and 8 are adjusted in step 204.

As described above, according to this embodiment, the gain adjuster 7 adjusts the gain 5I of the differential effective component signal 14, the gain adjuster 8 adjusts the gain of the carriage control signal 2, and these adjusters 7 and 8 are controlled. A microprocessor 6 is provided, and the processor 6 detects the maximum speed of the magnetic head and the final speed of the target track based on the track crossing pulse signal 3, and controls the adjusters 7 and 8 so that these speeds become predetermined speeds. By controlling it, initial settings can be performed automatically. Furthermore, by monitoring and correcting the operation of this positioning circuit even when the apparatus is in operation, the speed control of the magnetic head can be kept optimal.

〔Effect of the invention〕

As described above, according to the present invention, the positioning circuit detects the magnetic head speed and adjusts the differential signal of the position signal and the gain of the track crossing pulse signal.
The maximum speed of the magnetic head and the final speed to the target track can be automatically set without human intervention. Further, even if the speed changes during an access operation of the magnetic head, speed correction can be performed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a positioning circuit to which the access control method according to the present invention is applied, FIGS. 2 and 3 are diagrams for explaining speed detection of a magnetic head, and FIGS.
This figure is a diagram showing the operation flow of the circuit of FIG. 1. FIGS. 6 and 7 are diagrams for explaining a positioning circuit according to the prior art. 1... Position signal, 2... Carriage control signal, 3...
...Track crossing pulse signal, 4. Analog switch, 5. Differentiator, 6. Microprocessor. 7 and 8... Gain F11u device, 9... Integral filter, 10... Speed signal, 11 and 12... Variable resistor. Representative Patent Attorney Tadashi Akimoto Business 17 Figure 2 1- Ear 3 Figure Aku is a person * + ai Shima φ I, Ii 11 shi! force ff
箪 5 Figure 6 Figure 7 Figure 4 City g1! Shihe eight. 1 yoke NW -0

Claims (2)

[Claims] (1) In an automatic access control adjustment method for a positioning circuit that allows a magnetic head to access a target track on a magnetic disk, the first step is to adjust the gain of a differential signal obtained by differentiating a position signal obtained by the magnetic head passing through a track on the magnetic disk. a gain adjuster for adjusting the gain of a carriage control signal for moving the magnetic head, a second gain adjuster for adjusting the gain of a carriage control signal for moving the magnetic head, and a control means for controlling these gain adjusters, the control means for controlling the first and second gain adjusters. After setting the gain of the gain adjuster to the initial value, the maximum speed of the magnetic head and the final speed to the target track are detected based on the track crossing pulse signal generated each time the magnetic head passes the track of the magnetic disk during an access operation. , the first and second
An access control automatic adjustment method characterized by controlling the gain of a gain adjuster. (2) The control means detects the maximum speed of the magnetic head and the final speed toward the target track during the magnetic head access operation for data recording and reproduction, and adjusts the first and final speeds so that these maximum speeds and final speeds become predetermined speeds. 2. The access control automatic adjustment method according to claim 1, further comprising controlling the gain of the second gain adjuster.