JPS63281263A - Information storage device - Google Patents

Abstract

PURPOSE:To prevent the elimination of the recording information of a magnetic disk by comparing an acceleration signal corresponding to the acceleration of an actuator and a reference signal set beforehand and outputting a pulse signal when the acceleration signal is higher than the reference signal. CONSTITUTION:The position signal of a magnetic head 4 detected by a position sensor 13 is differentially shaped by a speed demodulating circuit 22, a speed signal is detected, and the head 4 is positioned to the prescribed position of a magnetic disk 3 while the signal is compared with a command signal from an electronic computer 20. The acceleration signal corresponding to the acceleration of an actuator 10 is detected by an acceleration detecting means 30 based on the position signal, a comparing means 40 compares it with the reference signal set beforehand and a pulse signal is outputted when the acceleration signal is higher than the reference signal. The electronic computer 20 outputs a reproducing command signal to a read/write circuit 23 immediately based on the pulse signal, reproduces the recording information of the magnetic disk 3 by the magnetic head 4 and re-records it to the storage device of the electronic computer 20. Thus, the elimination of the recording information is prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a disc-shaped record carrier capable of recording information (by changing the physical state of the surface) and a disc-shaped record carrier that is close to the surface of the disc-shaped record carrier. The present invention relates to an information storage device that can record or reproduce information by relative movement with a head.

[Conventional technology]

FIG. 4 is a cross-sectional view including the side surface of a conventional information storage device similar to the one shown in Japanese Patent Application Laid-Open No. 60-101777, and FIG. 5 is a block diagram showing the positioning control system of this information storage device. It is. In Figure 4, (1) is a support base, (2) is a spindle motor fixed to this support base, and (3) is a magnetic disc-shaped record carrier fixed to the rotating shaft of this spindle motor. It is a disk, and its surface serves as a recording medium for information. A magnetic head (4) is held close to the surface of the magnetic disk (3) and converts an electric signal into a change in the magnetic state of the surface or vice versa. (5) is the magnetic head (4)
) is installed and holds the pressure spring under pressure; (6) is an arm that fixes and supports this pressure spring; (II is the arm that attaches and holds the pressure spring); The actuator αη for transversely moving the magnetic disk (3) in the radial direction is a carriage to which the arm (6) is fixed, and it is equipped with a bearing and rolls on the support base (1). The driving coil mounted on the carriage (B), (G) is a position sensor, which includes an optical scale fixed to the carriage α1) Ic and the support base (1).
) consists of a fixed transducer. (to) is a yoke forming a magnetic path, and Qf9 is a magnet fixed to this yoke. In addition, in Figure 5, the wire is an electronic computer that performs information processing such as a positioning control system, and 01) is a servo circuit that receives a positioning command signal from the electronic computer wire and drives the actuator (the drive coil (6) in 10). A position signal indicating the position U of the magnetic head (4) on the magnetic disk (3) which is energized to drive the carriage (B) and detected by the position sensor 03, and this position is a speed obtained by differentially shaping the signal. The signal is compared with the above positioning command signal. (A) is a speed demodulation circuit that differentially shapes the position signal detected by the above position sensor 03 to detect a speed signal, and Q is a read/write circuit that rarely detects the above position signal. Upon receiving a recording/reproduction command signal from the electronic computer, the magnetic head (4) records information on the magnetic disk (3) or reproduces the recorded information.

A conventional information storage device is constructed as described above, and when the spindle motor (2) is energized and the magnetic disk (3) rotates at a predetermined rotational speed, this surface is held close by a viscous air flow generated on the surface. The magnetic head (4) receives buoyancy and is balanced with the pressing force of the pressure spring (5).
) surface and the prescribed VJ! Hydrodynamic spacing that preserves 3ii is provided. In this state, when a positioning command signal is output from the electronic computer to the servo circuit 01), the servo circuit C21) sends the drive coil of the actuator al (
2) A current corresponding to this positioning command signal flows through the yoke (to), the magnet Q (?), and the carriage (?) under the influence of the magnetic field of the magnetic path consisting of the air gap and the carriage () according to Fleming's left hand rule.
The magnetic head (4) is driven by the magnetic disk (3).
Transversely in the radial direction of Along with this traversal movement, the position sensor (to) detects a position signal, and this position signal is further differentiated and shaped by the speed demodulation circuit (a) to detect the speed signal, and the servo circuit (D) receives a positioning command from the electronic computer. The magnetic head (4) is positioned at a predetermined position on the magnetic disk (3) while comparing the signals. After completing this positioning, the read/write circuit receives a recording/reproduction command signal from the electronic computer (E) and sends it to the magnetic disk (3) via the magnetic head (4).
) to record information or to reproduce recorded information.

[Problem that the invention seeks to solve]

In the conventional information storage device as described above, contaminants may enter and exit the gap between the surface of the magnetic disk (3) held by hydrodynamic spacing and the magnetic head (4), or if the support base (11 is strong). When subjected to vibration or shock, the magnetic head (4) comes into contact with the surface of the magnetic disk (3), causing damage to the surface of the magnetic disk (3) and the magnetic head (4), which changes the buoyancy force applied to the magnetic head (4). After a long period of time, the magnetic head (4) crashes onto the surface of the magnetic disk (3), causing problems such as loss of recorded information on the magnetic disk (3).

This invention was made to solve this problem, and aims to provide an information storage device that can prevent the magnetic head from falling onto the surface of the magnetic disk and causing the recorded information on the magnetic disk to be lost. purpose.

[Means for solving problems]

The information storage device according to the present invention holds a head close to the recording surface of a rotatably driven disk-shaped record carrier, and drives an actuator equipped with the head based on an external command to move across the recording surface. Acceleration detection means that detects an acceleration signal corresponding to the acceleration of an actuator in a device that positions the head at a predetermined position, compares this acceleration signal with a preset reference signal, and outputs a pulse signal when the acceleration signal is higher than the reference signal. A means of comparison is provided.

[Effect]

In this invention, an acceleration signal corresponding to the acceleration of the actuator is detected, this acceleration signal is compared with a preset reference signal, and when the acceleration signal is higher than the reference signal, a pulse signal is output. In the process of moving the head, the head may come into contact with the surface of the record carrier, or be caught by a flaw on this surface, causing a change in the acceleration of the head, and the acceleration signal corresponding to that acceleration becoming higher than the preset reference signal. The pulse signal output at that time allows the head to crash onto the surface of the record carrier and re-record the recorded information in another information storage device before it is lost.

[Embodiments of the invention]

FIG. 1 is a block diagram showing the configuration of an embodiment of an information storage device according to the present invention. That is, in Figure 1 (
2) to (4), Ql, (Ll, ω~ The trowels are exactly the same as those of the conventional device described above. (To) is an acceleration detection means for detecting an acceleration signal corresponding to the acceleration of the actuator Ql, and ■ is The comparison means compares the acceleration signal outputted by the acceleration detection means with a preset reference signal and outputs a pulse signal when the acceleration signal is higher than the reference signal.

This information storage device is configured as described above and has a spindle.
When the motor (2) is energized and the magnetic disk (3) rotates at a predetermined rotation speed, a viscous air flow is generated on the surface of the magnetic disk (3). (3) Hydrodynamic spacing is provided to maintain a predetermined gap with the surface. In this state, when a positioning command signal is output from the electronic computer (1) to the servo circuit (incorporated), a current corresponding to this positioning command signal flows from the servo circuit ■υ to the actuator (11), which is driven by actuator 4 and is driven by the magnetic head (4). ) moves across the magnetic disk (3) in the radial direction.During this traversal movement, a position sensor (to) detects a position signal, and this position signal is differentially shaped by a speed demodulation circuit (a) to generate a speed signal. The magnetic head (4) is moved to the magnetic disk (3) while being detected and compared with the positioning command signal from the electronic computer using the servo circuit υ.
) to the specified position. Further, based on the above position signal, the acceleration detection means (7) detects an acceleration signal corresponding to the acceleration of the actuator C1G, and the comparison means (a) compares this acceleration signal with a preset reference signal, and the acceleration signal is the reference signal. Outputs a pulse signal when the signal is higher than the signal. Based on this pulse signal, the electronic computer (1) immediately outputs a reproduction command signal to the read/write circuit (to) and reproduces the recorded information on the magnetic disk (3) using the magnetic head (4), thereby reproducing the information stored in the computer's storage device. Trade is now re-recorded.

FIG. 2 is a block diagram that further embodies the embodiment of FIG. 1. In FIG. 2, (b) is a differentiation circuit that differentiates the speed signal output from the speed demodulation circuit 4 to detect an acceleration signal, (b) is a reference signal generation circuit that generates a reference signal,
□□□ is a comparator which compares the acceleration signal detected by the differentiation circuit 0η with the reference signal generated by the reference signal generation circuit 01) and outputs a pulse signal when the acceleration signal is higher than the reference signal. And acceleration detection means (7
) consists of a speed demodulation circuit (a) and a differentiating circuit c31), and the comparison means (g) consists of a reference signal generation circuit (6) and a comparator (6).

Next, the operation of the above embodiment will be explained with reference to FIG. Figure 3 (A) is a waveform diagram of the speed signal detected by the speed demodulation circuit, and Figure 3 (B) is the acceleration signal obtained by time-differentiating the speed signal detected by the speed demodulation circuit and the reference signal generation circuit ( 6) A waveform diagram of the reference signal (shown by a chain line) generated in Fig. 13 (o) is a pulse output when the acceleration signal and the reference signal are compared by the comparator (6) and the acceleration signal is higher than the reference signal. It is a waveform diagram of a signal.

First, the spindle motor (2) is energized and the magnetic disk (
3) rotates at a predetermined number of rotations, the magnetic head (4) receives buoyancy and maintains a predetermined gap from the surface of the magnetic disk (3). In this state, from the electronic computer to the servo circuit (towards)
outputs a positioning command signal to drive the actuator α1 to position the magnetic head (4) to a predetermined position on the magnetic disk (3), detects a position signal with a position sensor (to), and sends this position signal to a speed demodulation circuit ( The speed signal (shown by the solid line in FIG. 3(A)) is detected by performing differential shaping at the support (support). Furthermore, this velocity signal is differentiated and shaped by a differentiating circuit 0◇ to obtain an acceleration signal (Fig. 3 0) corresponding to the acceleration of the actuator (11).
3) shown by the solid line) and the reference signal generated by the reference signal generating circuit (2) (shown by the chain line in FIG. 3(B)) using a comparator. In this case, since the acceleration signal is lower than the reference signal, no pulse signal is output from the comparator to the electronic computer.

Next, the surface of the magnetic disk (3) and the magnetic head (4) Ic
When the M defect occurs and the buoyancy force applied to the magnetic head (4) changes, and the magnetic head (4) gets caught on or comes into contact with the surface of the magnetic disk (3), the speed signal changes.

Now, assuming that this speed signal changes as shown by the broken line in Fig. 3 (A), the acceleration signal obtained by differentially shaping this speed signal using the differentiating circuit (b) becomes as shown by the broken line in Fig. 3 (03). The comparator (6) outputs a pulse signal (shown in FIG. 3(0)) higher than the reference signal (shown by the chain line in FIG. 3 CB) to the electronic computer. The electronic computer (a) uses the read/write circuit (a) based on this pulse signal.
The 411 head (4) sends a reproduction command signal to the magnetic disk (3) and reads the recorded information on the magnetic disk (3) before it crashes onto the surface of the magnetic disk (3) and loses the recorded information. It is designed to be played back and re-recorded in the storage device of the electronic computer (a).

In the above embodiment, the acceleration signal corresponding to the acceleration of the actuator α is detected by the position sensor (to), the velocity demodulation circuit (a), and the differentiator circuit cl), but it can also be detected by other means such as a microcomputer, for example. A similar effect can be expected even if it is something that is detected.

Further, in the above embodiment, the position sensor (to) detects a position signal indicating the position of the magnetic head (4) on the magnetic disk (3), but the position signal of the servo track recorded on the magnetic disk (3) The information may be detected by being reproduced by the magnetic head (4) or another magnetic head.

Furthermore, in the above embodiment, an information storage device using magnetic means was explained, but information storage using a disk-shaped record carrier fJ is also possible.
It goes without saying that other means may be used as long as the & device is used.

〔Effect of the invention〕

As explained above, this invention holds a head close to the recording surface of a disk-shaped record carrier that is driven nine rotations, and drives an actuator equipped with this head based on an external command to move the head across the recording surface. In a device that positions the head at a predetermined position, a comparison means is provided to detect an acceleration signal corresponding to the acceleration of the actuator and compare this acceleration signal with a preset reference signal. Since the signal is output, the pulse signal that is output when a change occurs in the acceleration signal and becomes higher than the reference signal has the effect that the recorded information on the record carrier can be immediately reproduced through the head and re-recorded on another information storage device. There is 0

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of an information storage device according to the present invention, FIG. 2 is a block diagram further embodying the embodiment of FIG. 1, and FIG. 3(A) is a speed signal Figure 3 (0) is a waveform diagram of the acceleration signal and reference signal, Figure 3 (0) is a waveform diagram of the pulse signal output by the comparator, and Figure 4 is a cross section including the side surface of a conventional information storage device. figure,
FIG. 5 is a block diagram of the positioning control system. In the figure, (2) is the spindle motor, (3) is the magnetic disk, (4) is the magnetic head, (I is the actuator, QD is the servo circuit, (A) is the speed demodulation circuit,
□ is a read/write circuit, (7) is an acceleration detection means, (
B) is a differentiating circuit, 2) is a comparison means, 2) is a reference signal generation circuit, and 2) is a comparator. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A head is held close to the recording surface of a rotationally driven disc-shaped record carrier, and an actuator equipped with the head is driven based on an external command to move the head across the recording surface and position the head at a predetermined position on the recording surface. an acceleration detection means for detecting an acceleration signal corresponding to the acceleration of the actuator in a device for positioning the actuator, and comparing the acceleration signal with a preset reference signal and outputting a pulse signal when the acceleration signal is higher than the reference signal. An information storage device characterized by being provided with comparison means.