JPS5938974A - Disk device - Google Patents

Abstract

PURPOSE:To perform a high-speed track access with high precision, by having a shift of a disk so that a head crosses the information record part approximately at a constant speed during revolutions of a disk and at the same time reading an address to give an access to the target address. CONSTITUTION:A disk device is provided with a head 5 which records, reproduces or erases the information of a disk 1 containing information record parts disposed almost concentrically and having many recorded addresses, a linear motor 7 which shifts the head 5 in the radius direction of the disk 1, a revolving mechanism which revolves the disk 1 to the head 5, a reading part which reads the addresses on the disk 1 through the head 5, and a control circuit which controls the motor 7 based on the information and performs positioning of the head 5. Then the disk 1 is revolved and at the same time shifted so that the head 5 traverses the information record part approximately at a constant speed. At the same time, an address is read to give an access to the target address.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk device for recording, reproducing, or erasing information by selecting a track on a rotating storage medium.

[Technical background of the invention and problems with it]

A magnetic disk device is a device using a rotating storage medium that has been widely used in the past. Track selection in this device uses the tracks provided on the disk surface as a reference as a scale. However, the method of using the reference disk surface has a practical limit in magnetic disk drives in terms of accuracy.

[Purpose of the invention]

The present invention was developed based on the circumstances of Edict, and aims to provide a disk device capable of high-speed track access with high precision.

[Summary of the invention]

In the present invention, when accessing a track that requires precision, the track number recorded on the track is read while traversing the track, allowing stable, high-speed, and high-precision access to the target track. is possible.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2(a) and 2(b), an optical disk (disk) 1 has a spiral information recording portion with a constant pitch in the radial direction, and is rotationally driven by a motor 3. As shown in FIG.

Reading and writing of takes onto the optical disk 1 is performed by an optical head (head) 5. The optical head 5 is fixed to a movable part 9 of a DC linear motor (movement mechanism) 7 consisting of a movable part and a fixed part, and as the movable part 9 moves, the optical disk 10 moves linearly in the radial direction. be done. 11 is an optical scale fixed to the OI' moving part 9; 13 is a detector for detecting the position of the optical scale 11; Two types of detection signals with different phases are output in accordance with the movement of the radar 5).

The positioning circuit 11-15 of the linear motor 7 operates according to the target position signal supplied from an external device and the output signal of the detector 13, or according to whether the optical gutter 5 is in the tracking state or not. The linear motors 7/Y'- are driven in different ways.

The above position +jl determining servo circuit 15 includes a selection circuit 17, a speed detection circuit 19, an address pulse 94 output 1 channel 21, analog switches 23, 25, a selection adder (multiplexer) 35, an I)/A controller 27, and a counter. 33, a differential amplifier 29, a drive circuit 31, a latte 36, and a correction amount calculator 34.

The positioning servo circuit 15 has a selection circuit 17, a speed detection circuit 19, and an address pulse generation circuit 21. The selection circuit 17 valvely connects the detector 13 and two preamplifiers 16, 18, and selectively combines the two analog signals of different phases output from the detector 13, i.e., as described above. A position signal for positioning is output using the overlapping grid detection method. The speed detection circuit 19 is connected to the detector 13 via inverters 16 and 18, and differentiates 17 the output signal of the detector 13 to output a speed signal. Also... ■ The address pulse generating circuit 1 is connected to the detector 13 via preamplifiers 16 and 18,
a side-turning circuit 7 that generates position pulses according to two types of analog detection signals with different phases outputted from the detector 13;
Supply to 7. The selection circuit 17 and the speed detection circuit 1
9 are connected to analog switches 23 and 25, respectively. These analog switches 23 and 25 selectively pass the output signals from the selection circuit 77 and the speed detection circuit 19 based on a control signal output from a control circuit 77 to be described later. Further, the control rM1 circuit 7
7 is connected to the multiplexer 35 via a latch 36. This multiplexer 35 (receives the signal that has been processed by the processing circuit 77 and the output signal of one of the correction amount calculators 34, and selectively sends the signal to the multiplexer 35).
Output to the VC/connected I)/A converter 27.

The counter 33 is connected to the rotary motor 3, counts the rotation synchronized clock signal output from the rotary motor 3, and supplies this value to the multiplexer 35. The multiplexer 35 selectively outputs the output signal from the counter 33 to 1 to 1 when the optical disc 1 is accessed continuously, and outputs the output signal from the control@1 circuit 77 when the optical disc 1 is freely accessed. Said side (goods) I! :! It is controlled by J path 77. The D/A converter 27 outputs an analog signal corresponding to the output signal selectively outputted from the Ail multiplexer 35, that is, a reference position signal based on the value of the counter 33 when the optical disc 1 is accessed continuously; The changing speed is equal to the speed at which the information recording section is displaced in the moving direction of the linear motor. When the optical disk 1 is freely accessed, a speed curve signal is supplied to one input terminal of the differential amplifier 29. The output signal of the selection circuit 17 or the speed detection circuit 19 is supplied to the other input terminal of the amplifier 29 via the analog switches 23 and 25. The position signal from the selection circuit 17, which is a control quantity of the differential amplifier 29, or the speed signal from the speed detection circuit 19, and I), which is a control target value.
/ Outputs a difference signal from the analog signal from the A converter 27, that is, a control deviation, to the drive circuit 31. Drive circuit 3
1 drives the IJ near motor 7 in accordance with the output signal of the differential amplifier 29.

On the other hand, optical devices fixed to the movable part of the linear motor 7 include a five-throat semiconductor laser oscillator 37, a collimator lens 39,
It is composed of a deflection beam splitter 41, a λ//I plate 43, a movable objective lens 45, a condenser lens 49, a photodetector 51, and a drive coil 47. Laser oscillator 37
is driven and controlled by a beam control circuit a01 (not shown), and is configured so that its output beam light d' can be switched between two beam powers: a recording beam light and a reproduction beam light fi15. The beam light from the laser beam oscillator 37 is converted into a parallel beam by a collimator lens 39,
The beam is guided to a movable objective lens 45 via a beam sinter 41 and a 274 plate 43, and then converged by the movable objective lens 45 to a diameter of about 1 μm to spread the irradiation onto the -C optical disc IF (lower surface). Further, the movable objective lens 4
5 is moved by a drive coil 47 as necessary. The reflected light from the optical disc 1 is reflected by a movable objective lens 45, λ/4
Board 43. The light is guided to a condensing lens 49 via t, q and Pino Sgelitter 41, where it is condensed and sent to a photodetector 5.
1 and converted into lightning and energy signals. @Light distribution detector (
The output of the two-split light receiver) 51 is sent to a signal processing circuit (not shown) and used for a reproduction signal, focus control, and the like.

Output of the photodetector 5 and lagging servo circuit 5
This tracking servo circuit 53 drives the drive coil 47 of the movable lens 45 according to the positional deviation signal from the photodetector 51, and moves the movable lens 45 in the direction of the arrow in the figure. Accurate positional deviation detection and tracking and trunk jumping based on it are performed. That is, the tracking servo circuit 53
are a differential amplifier 55, an adder 69, a phase compensation circuit 57, a track jump pulse generator 59, and an analog switch 6.
'l, 63, a moving direction detection circuit 58 and an amplifier 65. The differential amplifier 55 and the adder 69 are each connected to a preamplifier 54-. It is connected to the photodetector 51 via the photodetector 56 and receives and receives the detection signal from the photodetector 51. The differential amplifier 55 sends the difference signal to the phase compensation circuit 5.
7, and outputs the 69-added signal from the summing amplifier to the binarization circuit 7.
Output to 1.

The phase compensation circuit 57 compensates for the phase of the difference signal output from the differential amplifier 55 so as to prevent the movable lens 45 from standing. This phase compensation circuit 57θ) output signal is supplied to the amplifier 65 via the analog switch 61.
5Q is 0 which outputs a signal to jump by a track.
(σ) The output of the track jump pulse generator 59 is supplied to the amplifier 1Q unit 65 via an analog switch 63 [7]. These analog switches 51, 636-, J
:θj'l is controlled by the control signal from the IG field circuit 77. Furthermore, the output signal of the amplifier 65 is supplied to the drive coil 47.

The reproduced signal detected by the detector 51 is supplied to an adder 69, and the output signal of the adder 69 is sent to a binarization circuit 71.
can be supplied to. The signal binarized by this binarization circuit 71 is supplied to a decoder 75 via a converter 73.

The decoder 75 modulates the signal σ) from the binarization circuit 38 and supplies the output signal to the side shift circuit 77 as address information (track number).

Further, the control circuit 77 performs overall control i11,
For example, an external device (not shown), such as a register 79 that stores the target track ('l'r) number (No) of the host computer, an address counter that counts up or down in response to pulses from the address pulse generation circuit 21, and U7. , a calculation circuit 83 that calculates the difference between the count value of this counter 81 and the target position 1 way signal of the register 79, an eccentricity counter 56, an eccentricity register 57, a function generation circuit 85, etc. ing.

An example of such a microcomputer is the 8-bit microcomputer 8085A manufactured by Bain Chiru Co., Ltd.

The 11i11i+111 circuit 77 controls the linear motor 7 or controls the movable lens 4 according to the difference between the reproduction track number supplied from the decoder 75 and the target track number.
Track jump control by 5, Trough Kink 1H1i
do one's own thing.

Next, 1--congratulate the operation of the configuration described above. For example, now, a target track number is supplied to the control circuit 77 from an external device (not shown), such as a host computer, and the control circuit 77 receives the control circuit VfJ77.
Assume that the data is stored in the register 79 within. Then, the arithmetic circuit 83 subtracts the target address information calculated from the target track number stored in the register 79 and the current position information output from the counter 81, and supplies the difference signal to the function generation circuit 85. . As a result, function generation circuit 8
5 generates a speed reference signal corresponding to the supplied difference, and 7
It can be supplied to the multiplexer 35 by setting it in the latte 36.

At this time, a control signal output from the control circuit 77 is supplied to the analog switch 25, and the analog switch 25 is turned on. The multiplexer 35 selectively outputs a speed reference signal from the front vaping control subcircuit 77 having a predetermined speed curve to the D/A converter 27 in response to a control signal from the control circuit 77. This speed reference signal is supplied to the differential amplifier 29 together with the speed feed pack signal output from the speed detection circuit 19 or the analog switch 25 [7], and the differential amplifier 29 receives a signal corresponding to the difference between the two signals. Output.

The output signal of this differential amplifier 29 is provided to a drive lol path 31. Therefore, the drive circuit 3] drives the linear motor 7 and converts the speed reference signal from the I)/A converter 27 into the speed reference signal 17.
, the linear motor 70 and the moving part 9 (
That is, when the optical head 5) reaches the target position or the movable part 9 reaches the target position 2, the control circuit 77 turns on the analog switch 23, and when llfJ, the control circuit 77 outputs 1)/A.
The output signal of the converter 27 is set to a constant level signal.

As a result, a difference signal between the position signal from the selection circuit 17 and the constant level signal from the 1]/A converter 27 is output from the differential amplifier 29 and supplied to the drive circuit 31. Positioning of this Yuuki-cho #1 part 9 (by positioning servo system)
The channel section 9 is locked.

Before tC: The track number at the locked position is read by the optical head 5. In other words, the L beam lights from the laser oscillator 37 are converted by the lens 39, and then sent to the beat splitter 4.
1, it is reflected to the optical disk 1 side and is converged by λ/4 plate 4 and sheet metal 3, and is focused by lens 45, which forms a spot on the original disk I.
A positioning shot was fired at L's trunk. The reflected light from the optical disk Ri1 due to this irradiation is CrJ-Zih V 7
, I: 45.2/4 plate 43, beam splitter 4]
, passes through the lens 49 and forms an image on the received light IR1 of the photodetector 51, where it is photoelectrically converted. The detection signal photoelectrically converted by this photodetector 5 is modulated by an adder 69 to increase the averaging effect. 1 n: d t is then binarized by the binarization circuit 71. These two (icified) values are buffered in a buffer 73, decoded into f1.1 by a decoder 75, and supplied to the control circuit 77 as address information (track number). The circuit 77 compares the playback track number with the target track number in the upper register 79, and if there is a difference of more than 10 racks, for example, the arithmetic circuit returns as described above.
The linear motor 7 is driven in accordance with the difference signal. Again 1
If the difference is less than 0 track, the movable lens 45 is driven in response to a pulse from the track jump pulse generator 59 to direct the beam light to the target track 71. By turning off the analog switch 61 and turning on the analog switch 63, the track jump pulse is flushed to the amplifier 65.
The beam light is trunk-jumped by moving the /I-movement coil 47 of the movable L/nce 45 and the movable lens 45 according to the output signal of the movable lens 45.

After the beam light corresponds to the target I rack by the movement of the lenses 45, the analog switch 61 is turned on by a controller signal from the sterilization circuit 77. As a result, the preamplifiers 54, 56 . The positional deviation signal obtained through the differential amplifier 55 is selected. After this first position signal is compensated by the phase compensation circuit 57, it is amplified by the amplifier 65 and applied to the drive coil 47.
5 to Hiragihan+L, l-1f-, GIF, f; 1 position down L) φ output and track A trace (tracking) based on it. Another record or something? fM people operate similarly.

When moving the optical throat 5 to the track (marked l-1) as described above, the optical scale 11 is moved by -1.
The linear motor 7 is driven until the address matches the target address information calculated from the predetermined track number. When the correspondence is established, the actual track number of the optical disk 1 and the target track number are compared, and when the difference between them is greater than 50 tracks, the optical scale 11 is turned off again and the linear motor 7 is driven in accordance with the difference. Ru.

When the difference is within 5 tracks, the movable lens 45 is caused to track jump by the number of tracks with the previous difference, so that the beam light of the optical head 5 corresponds to the target track. During this time, access is performed by constant speed seek. This minimizes the movement side effects of the beam light within the optical head. In other words, stabilization can be achieved by ensuring that the position of the movable lens 45 is always near the center of the movable range with sufficient servo margin. Furthermore, by positioning using a linear motor to the nearest value of the target track, the time it takes for the optical head 5 to arrive at the target track can be shortened.Furthermore, even when the external shape of the optical disc changes due to temperature, humidity, etc., the target track can be quickly and stably positioned. Move the optical head to the trunk.

Next, as described in h, after the optical disk 11 corresponds to the target track, the information on the optical disk 11 is continuously reproduced (C is described for the case of reproduction). : Reference position signal from 33,
The speed at which this changes is the information Fir, and the recording circuit 77 selects and outputs the speed at which the linear motor is displaced in the f8 direction. 'l 1flll signal is supplied and control (fi1
Supplying the signal 0 This result 1) / A converter 27
Then, the reference position 1ift fM signal from the counter 33 is converted into analog information and supplied to the differential amplifier 29. Historically, the differential amplifier 29 is supplied with a position feedback signal from the selection circuit 17 via the analog switch 23, and as a result, the control deviation of the position of the differential amplifier 29 is supplied to the driver 1jjJ circuit 31. As a result, the drive circuit 31 drives the linear sweater 7 to a position corresponding to the reference position 16 signal. The linear motor 7 moves at a speed that is different from the speed at which the bar record information recording section is displaced in the moving direction of the linear motor. As a result, the optical head 5 is moved and the movable lens 45 is set near the center of the optical head 5. At this time, the analog switch 61 is turned on by the 7 to 11...1 signal from the control circuit 77, and the snow-shaped information recording section is turned on by the 7 to 11...1 signal from the control circuit 77. The information is then played back. In addition, when recording or erasing data, use the same operation as described in L for the amount of 1. obtain.

As mentioned above, the information records the displacement speed of the linear motor in the operating direction, etc. 1. By moving the linear motor 7 at a fast speed, the iiJ moving lens absorbs the radial displacement of the information recording section (as it does not require 7, stable tracking can be achieved).

In addition, in order to increase the stability of tracking, etc., the center of the information recording section is shifted from the center of rotation, so that the information recording section σ) track is relative to the head [,1
, Shift and correction are performed for the displacement in the radial direction in a one-h chord function. The method is as follows, according to the flowchart in FIG.
In order to detect a track groove shallower than the 0 pit, the reflected light is strong 1, Q: No 1? ? + An arithmetic circuit 83 inside the output and side circuit 77 with a threshold
, eccentricity [/) star SN7, eccentricity counter 86, internal memo IJ h to hold the number of unsuccessful trials 'F1
/ register (tf shown) is used.

The moving direction detection circuit 5B receives the signal from the binarization circuit 71 that detects the track, and determines which direction (inward or outward in the f-peak direction) from the output of the differential circuit 55. If the signal crosses the groove in an outward direction, it outputs a negative signal. This signal is filtered and the number of tracks traversed is counted by an eccentricity counter 86. Z for the eccentricity measured in this way,
Correction is performed by using a counter 33 and a correction amount calculator 34 and applying a signal to the D/A converter 27 through an f selection saver 35. The lower five digits of the counter 331 indicate the rotation angle of the motor 3 by dividing one revolution into (14), and based on this output, the correction amount calculator 34 outputs a value according to a cosine (sine') function. When the control of the linear motor 11 is on the negative side (switch 23 is ON), a function of the cosine and the sine of the time angle of the speed control is output, and the value of the register 86 is set when the 70-dog f! The direction of eccentricity is given at the start timing immediately after the counter 33 is reset.

The amount of eccentricity is measured up to three times, and the third time is performed with the motor rotating at half the speed. Also, the 6th digit of the counter 33 (6
The following values are used to correct radially outward tracking due to the spiral drawn by the track.

Next, a method of accessing the target track will be explained. FIG. 3 is a 70-tayat diagram showing an overview of access operations. The amount of eccentricity was measured as described in E. next,
The target Tr%No is set in response to a request from the host computer. "Eccentricity correction ONJ is selected by adder 3.
5 is in the internal input addition state, and since the linear motor is in the position control state here, the correction amount calculator 34
is set to position mode. [Tracking ONJ is performed by turning on the switches 23 and 61.
The “already recorded area?” check can be performed by checking the output of the duder 75. The amount of eccentricity must be measured using the tracking guide group (groove) of the unrecorded track, and in this example, where recording is performed sequentially from the inside, an appropriate position in the outside unrecorded area is selected. I am doing it. Therefore, the initial setting is 1. Later, branch 17 to the rNJ side and move inward by the linear motor 11 until it hits the already recorded area.The amount of eccentricity can be measured by measuring the amount of eccentricity by Normally, the access operation starts with resetting Ir r and No. 1 to the register 79. After reaching the recorded area, lJ'r
, NOl is read and one position inside the target track (11
%No, 01 less) Track number D up to track
Calculate T. Until this value reaches O, access is performed using three types of access controls depending on the size. D
When T'=O, the "tracking ONJ" state is entered, and tracking is performed when the target track is reached.

When the code r and number of the target track are obtained from the decoder, the subsequent data is read and sent to the host computer, and the access operation is completed.

FIG. 5 is a flowchart of "scale access" which is one of the three types of access control.

Here, set the eccentricity correction to 0)" F l (selection adder 3
50 inputs from latch 36 only).

Value 1) Scaled value of T-karin near motor 11 1)
S is calculated, and the target scale i 1 S is derived.

The switch 25 is turned ON according to the output of the function generation circuit 85 until this value TS matches the contents of the address counter 81.
+ and 7 drive the linear motor 11 with speed control.

FIG. 6 is a flowchart of seek access control. Is it possible to access the optical head at a constant speed while the optical head is busy rotating the disk? Tip: Move it across the needle part and at the same time take out the thorn 6 of 71'r, No. Accordingly, calculate the value 1) T1-, and adjust this until it becomes 5 or less. This seat access is performed with eccentricity correction O.
This is done in the N state. % in seek access
Although it is not possible to read all T' % No %,
A large number of 'vr1NO1' are recorded in the recorded area of the information recording section, and can be read with a probability that does not hinder access. In this case, T multiple times per rotation.
r, No. are being recorded.

FIG. 7 is a flowchart of track jump access used to access the nearest track among the three buildings.

[Bow light effect]

As described in detail in E1 below, according to the present invention, access can be performed while checking the position of the head that reads information relative to the information recorder, so that reliable access can be performed at a relatively gradual speed. , it can be done. Furthermore, by applying eccentricity correction at this time, reliable access can be made even to an eccentric information storage section.

[Brief explanation of the drawing]

FIG. 1 is a front view of a mechanical section in an embodiment of the disk device of the present invention, and FIGS. 2(a) and 2(fb) are block diagrams showing the drive p and control open circuit network of the disk device shown in FIG. , Figure 3 to /! Figure g7 is a flowchart showing the operation of one embodiment. 01... Optical disk (disc), 5... Optical head (head), 7... Linear motor (moving mechanism), 71... Binarization circuit, 77... ...Control circuit. Drawing +? '+'';, l'' 12 no) 3rd
Figure 4 Figure 5 Figure 6 District procedure correction valve (method) 1. Indication of the case Patent application No. 1983-146205 2 Seimei's name disk device 3, person making the amendment Relationship to the case Patent applicant (307) Tokyo Shibaura'NL Ki Co., Ltd. 4, agent Address: Uchisaiwai-cho, Chiyoda-ku, Tokyo 100 1-1-6 Showa @ November 30, 1957 (shipment date) 6 Application subject to amendment, full text of specification and drawing 7, content of amendment Application, engraving of specification and drawings (contents, blue! None) Procedural amendment valve (eye) Kazuo Wakasugi, Commissioner of the Japan Patent Office1, Indication of the case, Patent Application No. 1983-1462052, Title of the invention, Disk device3, Person making the amendment, Relationship to the case, Patent claim in the patent applicant's specification Range field. Detailed Description of the Invention and Drawing 6, Contents of Amendment, Page 2 (1) Written by I'lli C The claims are amended as shown in the attached sheet 0 (2) Page 21, line 17 of the specification ['(T r,
No, 03 one less) To J up to the track "(
Tr. No, there is one less (however, you can set it to an appropriate value n if necessary, and you can access it near the inside.)]
To the truck,” he corrected. (3) Page 21, line 20 of the specification...If DT=o," followed by "[if necessary l DT l≦m(mouth)
≦n/2. +n, where the number is an integer). As m becomes larger, access becomes easier]. (4) Correct Figure 3 of the drawings as shown in the attached sheet.
, a head for recording, reproducing, or erasing information on the disk, a moving mechanism for moving the head in the radial direction of the disk, and a rotation mechanism for rotating the disk for the head. Then, the above-mentioned -\ throat) Ifi is used to read one address on the upper disk.The above-mentioned moving mechanism is controlled based on the information from this reading section and the upper head is read. While rotating the upper disk, the head moves across the recording section at a constant speed of approximately V; L, and also takes one address and sets the target. A disk 1ζ arrangement characterized in that one address to be accessed is accessed 7'. (2) When the head crosses the information HD recording section, the information and IC
The patent claim is characterized in that the speed at which the -\ throat crosses the information recording section is made constant by correcting the radial movement due to eccentricity from the I side during the rotation of the C section rotation mechanism. The disk device according to scope 1. (3) The head is a stem that tracks on the information recording section. Nishiki Otsu±Yu'ItKI,, 工'' 1 (Den III
#E 4r t isk device. equipment.

Claims (1)

[Claims] fl) is a head for recording, reproducing, or erasing information on a disk having an information recording section arranged substantially concentrically and recording a large number of track numbers; a rotating mechanism that rotates the disk relative to the disk; a reading section that reads the track number of the disk through the F head; The head is moved across the information recording section at a substantially constant speed while the disk is rotated, and the track number is read and set as a target. A disk device characterized in that tracks are accessed. (2) When -\rad crosses the information recording section, by correcting the radial movement due to eccentricity from the rotation center of the rotation mechanism of the information recording section, the speed at which -\rad crosses the information recording section can be reduced. A disk device according to claim 1, characterized in that the constant value is constant.