JPS61500877A - Magnetic recording medium and its tracking device and method - 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 relates to a magnetic recording medium, and relates to magnetically reading data from the medium and storing the data. A device having a read/write head for writing. In particular, this invention For magnetic disks with data tracks, the specified tracks on the magnetic disk can be tracked. The present invention relates to a device and method for kinging.

Background technology Problems that occur on magnetic disks when writing large amounts of information on high-density magnetic tracks The problem is ensuring correct positioning of the read/write head relative to the desired track and It is very difficult to guarantee correct tracking after the discovery of the nine tracks. That's what I mean. Conventional magnetic disks have holes through which the disk is inserted. When light reaches the optical sensor of the disk drive, the disk is ejected/write head is activated. The positioning below consists of nine sectors and further includes a circuit, Its positioning means that while the sector is under the read/write head, the read/write head is Positioned to be above the specified data track. Corresponding data/ Data from a track is stored in the magnetic disk memory of that data track. When a magnetic disk sector passes under the read/write head, Read from memory.

U.S. Patent No. 4,402,025 describes the “Winchester” magnetic disk drive. disc is disclosed, and its magnetic disk.

The drive stores both data and thermal track information on the disk drive's magnetic disk. If the sensor is magnetically recorded on the disk, the sensor positioning provided there will be detected by the mechanism. A specific data tote is read from the turbo head in response to the next go track information. Position the read/write hect on the rack. In addition, data signals and servo The lock position is equipped with a magnetic shield to prevent interference with signals.

The disadvantage of this structure is that data information and positioning information are separated from each other on separate surfaces of the disk. Because it occupies space, the space available for data information is very small. Toderuru.

Disclosure of invention The purpose of this invention is to eliminate the above-mentioned disadvantages and to record a larger amount of data than conventional recording media of the same size. provides a magnetic recording medium capable of recording data information, as well as transporting it. An object of the present invention is to provide a method and apparatus for tracking or tracking.

According to this invention, it magnetically reads data from a magnetic recording medium and stores data therein. Data - Used in devices with magnetically written read/write data, which connect the board and multiple a magnetic recording device comprising: a magnetic material disposed on its substrate to have data tracks; a medium, the recording medium being recorded in a manner corresponding to each of the data tracks; and a plurality of optical guidelines, said guidelines being connected to said read/write head. a device having said successive/write head adjacent to a selected one of said guidelines; so that it can be used to position and track said guidelines. To provide a magnetic recording medium that is characterized by the above characteristics.

According to another aspect of the invention, it selects a magnetic read/write head for a recording medium. selectively position and magnetically read and write data on one of a plurality of data tracks; 6 on the fc device, each corresponding to one of the data tracks. operatively positioned to irradiate the next optical guideline recorded on the recording medium so as to a light source means placed and detecting light reflected from one of said optical guidelines; a light detecting means which operates so as to detect a signal in response to the light detecting means; positioning the read/input head relative to the recording medium in response to reflected light; and thermetic means operative to adjust the temperature.

Further, according to another aspect of the invention, it is configured to be adjacent to and read data from a recording medium. The method of positioning the ninth read/write head to read and write to it is described above. An optical guideline is provided on a recording medium, and the optical guideline is irradiated with a light source means. , detecting light reflected from one of the optical guidelines; detecting the reflected light; reading/writing with a selected one of a plurality of data trunks of the recording medium in response to positioning the read/write head in relation to the recording medium; each step of magnetically writing or reading data to or from one of a number of data tracks. , such that each of said data tracks corresponds to one of said optical guidelines. A method for positioning a read/write head according to the method is provided.

In a preferred embodiment of the invention, the magnetic recording medium is provided with an optical guide in the form of concentric circles. This is a disc with an idle line. Each guideline has its own Corresponding magnetic tracks and lines of different lengths representing different talk codes It is cut off in places to create segments.

As can be seen from the above explanation, data information can be magnetically decoded using conventional methods. Track information is separated from the data signal and recorded on the disc. The signal should be read in such a way that it does not interfere with the signal being read or written to the disk. data track - so that the code to be displayed can be sensed optically recorded optically. The rounding, the duplication of data information and track information Can be done. Moreover, optical guidelines allow accurate tracking of data docking. The data tracks are positioned by the read/write head using magnetic signals. Nine, same size devices can be placed much closer to each other. The data density of the disk can also be significantly increased.

Brief description of the drawing The present invention will now be described in detail with reference to the accompanying drawings below.

FIG. 1 is an illustration of a magnetic disk and successive/write head according to the present invention.

Figure 2 is a partial cross-section of the disk and read/write rad of Figure 1 as seen from line 2-2. It is a front view.

Figure 3 shows the nine-point guideline optically recorded on the disks of Figures 1 and 2. This is a partial example.

Part 4 shows a block diagram of a disk drive that utilizes real-world gold of this invention. Was.

FIG. A plot of light intensity.

FIG. 6 shows another implementation of t4b that can be used in the optical detection system of the present invention. FIG. 3 is a cross-sectional view of a column.

Figures 7 to 10 can be used in this invention for illuminating and detecting optical guidelines. This is another example of a part of the optical system.

BEST MODE FOR CARRYING OUT THE INVENTION Figure 1 shows the magnetic disk and reading/writing of the disk drive used in this invention. FIG. 3 is an exemplary diagram of a loading head;

The disk 10 illustrated here is one of many recording media capable of recording data. One of them is fine, this fruit 1, the well-known "Winchester 2 disk It is a magnetic disk that can be used as a drive.As is well known, the disk ClO allows data to be magnetically written to and read from the disk. Uniquely aerodynamically stable '$, read/write disk under 14 degrees It rotates at a very high speed around the center noop 12t so as to cause the rotation to occur. The technology is well known Well, no further explanation is necessary.

Read/write head 14 is a magnetic element for writing and reading data to and from disk 10. 16 and transmits data electronically as is well known. .

The disk 10 is configured to record desired tracks of magnetically recorded data on the disk 10 as described below. 1, which can be used to position the read/write head 14 over the Group optical guidelines 20 are recorded on that surface.

The guideline 20 is concentric with the disk 10, has a width of approximately 5 microns, and a density of approximately Recorded in 5,000 finch.

Each guideline 20 is coded in such a way that each guideline has a unique code. As you can see here, it has cut-off parts at certain intervals. Therefore, Guideline 20 is /write head 14 uses to position the read/write head on the desired data track. Not only does the code included in each guideline serves to identify the data trunk from which data is being read or written.

As is well known, a disk drive consists of multiple disks stacked vertically on top of each other. It is possible to rotate around Tesakushi and Nopu at the same time. In such cases, Each disk has the same number of read/write heads as disks.

The Marugame device included in the disk drive can be positioned adjacent to the surface retrieves data from any desired track from any disk in that disk stack. can be read out. Also, each read in a system with multiple disks The /l-containing head can also have an optical system for detecting the system.

! 5! The output/write head 14 has a ninth optical system that detects the guideline 20. 24i included. To illuminate the surface of the disk 10, a cladding illumination fiber or the like is used. A light source is provided to transmit optical data to appropriate detection circuitry, as described below. If you keep it for a long time, it will be equipped with an optical light such as a tilted index fiber. It will be done. Words like “optics” are used here, but guidelines and detection The instrument may be for any wavelength and should not be limited to visible light. You should understand that there is no such thing.

FIG. 2 shows the read/write head 14 and magnetic disk cut along line 2-2 in FIG. This figure illustrates a part of the screen 10. The magnetic disk 10 is the optical guideline 2 Contains an aluminum substrate 30t on which 0 is recorded. Optical guideline 20 is aluminum It is formed by concentric circles recorded alternately in light and dark on the aluminum substrate 30. Bright part 32 In this preferred embodiment, optical system 24 senses the reflection of light, as described below. It is shaped like this. The pupil part 34 is the one used for the bright part 32 used here. Alternatively, it can also be realized using other suitable detection means. Magnetic recording material layer 36 can be thrown after recording the guideline as shown in the figure, and a suitable catch can be made. Coat the entire surface of the coating ff138t disk 10. protective layer 38 and The magnetic recording material layer 36 is sufficiently transparent to allow easy inspection of the recorded guidelines 20. You have to do it with what you can know. Using some opaque magnetic distribution material If desired, the f-id 2-in 20 can be placed on the surface of the disc instead of the above. It can also be recorded.

21m and the optical system 24 of the system shown in FIG. The optical system 24 is positioned so that the guideline 20 is read on the same side as the guide. The drive line 20 can also be positioned so that it can be detected on the opposite side of the magnetically recorded data. Ru. The optical system 24 has an optical path extending through the read/write head 14t, as shown in the figure. It is arranged to pass concentrically through the center of the optical system 24 as shown in FIG. including. Irradiation fibers 260 Individual fibers are connected to sensing light pipes as shown in the figure. 28 at the end 42 and then as at 40 . Therefore, the illumination fiber 26 is designed to emit light evenly from around the light pipe end 42. You can see that it is placed like a sea urchin. The irradiation is transferred to the surface of the disk 100. , light/# The bright portion 32 of the guideline 20 directly below the iso is irradiated evenly. Rai The end of the fiber 26 and the end 42 of the fiber 28 are connected to the surface of the disk 10. It is shaped and polished to focus light. In this preferred embodiment, each The light beam 46 reflected from the guideline 20 of the read/write head When positioned correctly above 0, the light is focused to a point approximately 5 microns in diameter and reflected. The point where the incident light beam 46 is focused must be completely within the width of the single guide line 200. become.

A conventional magnetic read/write element 16 is mounted on the head 14 and magnetically reads the disk 10. Write to and read from. As is well known, the read/write head 14 is The magnetic recording material "hot layer 36" and the magnetic recording material are placed at a certain distance above the lying magnetic disk. A magnetic circuit is formed between the air element 16 and a suitable electrical signal is sent via line 1B. Read controlled recorded data. Magnetic element 160 operation and magnetic readout of data and The recording is done in the conventional manner, with some well-known methods and some data that require further explanation. It consists of a light reflecting part 32 recorded on the surface of the disc 100 and a dark part 34 blocking it. Ru. Disk 10 moves past read/write head 14 in the direction indicated by arrow 52. . The point or spot 54 is the aforementioned point on which the reflected beam 46 of FIG. 2 is focused. No. As shown in FIG. 3, the read/write head 14 has a spot or point 54 as a guideline 20 is positioned completely within the bright portion 32 of 20. The read/write head is radially inwards as shown by double-headed arrows 56 in FIGS. 2, 3, 4, and 6. It can move in either direction, toward the interior or toward the exterior.

Next, moving to FIG. magnetically recorded from the appropriate electronic data circuitry 59 of the disk drive in the manner of It is positioned on the disk 10 for writing and reading data therefrom.

The positioning of the read/write head 14 in a radial manner as shown by arrows 56 is Achieved by conventional servo mechanism including motor 60 and servo control circuit 62t be done. A light source such as a radar or light emitting diode (LED) light source 63 is magnetic. In order to irradiate the surface of the disk 1o, an irradiation tube 64t is provided to guide the light through the irradiation tube 25. It will be done.

The irradiation light source 63 is supplied from an appropriate irradiation power supply circuit 66 according to the type of light source 63 used. Power is given. The illumination tube 64 is a fan arranged similar to that of FIG. The second Using the same method as explained in the figure, install the light that detects the light reflected from the guideline 20. Focus the light onto the surface of the disk lO so that it is facing the disk, and then use the lens to It can also be terminated. Light Nogui 70 is the Light Gui in Figure 2. The fiber optics 28 may be a graded index fiber such as the one described above. light pie The optical path from drop 70 to the sensing circuitry may be in any of a number of known configurations. However, if the light beam 70 hits the target, the light 741 will be reflected from the optical detector 76. The mirror 72 may be shown schematically.

Optical detector 76 can be one of a number of well-known sensors that generate electrical signals in response to optical tracking. Any of the following photodetectors may be used. The photodetector 76 includes a pair of detectors. Use unit 80.82. Detector unit 7) 80 is the servo control circuit 62 It is connected through conductor 84 to an amplifier 86 which is connected to. Detector unit The port 82 is connected via a conductor 88 to an amplifier 90 which is connected to the servo control circuit 62. Continued. The electrical signal from amplifier 86 is compared to the electrical signal from amplifier 90; Servo control circuit 62 generates an error signal for use in a conventional manner and connects conductor 92. to the servo motor 60 to determine the position of the read/write head 14. Make adjustments. By adjusting the desired Position the read/write head 14 in the trunk.

Detector unit 80 is connected via conductor 96 to summing circuit 94, - The unit 82 is connected to a summation circuit 94 via a conductor 98. The summation circuit 94 The output is a decoding circuit 10 that decodes the cutoff section 22 of the idle line 20 shown in FIG. 0 and on which guideline the read/write head 14 is positioned. 5. Make sure that it is the same.

The track identification code of the track currently being read is written on the conductor 102 as shown in the figure. t- to the thermistor control circuit 62. The desired track identification code is 104't--via magnetic disk circuitry or a suitable computer processor. is supplied from the track decoding circuit 100 to the servo control circuit 62, and from the track decoding circuit 100. Compare with track identification code. Tracks sent from conductor 102 and 1σ4 If the identification codes are not equal or if a new desired track identification is entered via conductor 104. If another code is received, the servo control circuit 62 connects the servo via conductor 92. Motor 60'C1M generates appropriate control signals and reads/writes to desired track. Reposition the loading head 14. From the amplifier 86.90, the electrical signal is is used to hold the read/write head 14 at a desired track.

FIG. 5 shows a suit of light intensity across the width of one light reflecting section 32 of the guideline 20. ) 110. The light intensity 110 is determined by the light reflecting portion 32 as represented by the axis 112 in FIG. It is maximum at the center of The light intensity 110 is determined by the light reflecting part 3 as shown by d" in FIG. It descends as it moves away from the center of 2 in either direction. Focused spot 5 4 is the point 118, 12 of A on the intensity curve 110 when aligned with the guideline 20. 0 so that it falls within the desired point of the intensity curve 110; therefore, When spot 54 is positioned at the true center of 32 as shown in FIG. The next lights received by units 80 and 82 are from center line 112 to points 118 and 120, respectively. is equal to the shaded portion of each half of curve 110 up to . Read/write head 1 4 moves relative to the magnetic disk 10, and the spot 54 is no longer at the center of the reflective section 32. When the light decreases, the light received by each detector is no longer equal.

For example, if the spot 54 fluctuates so that its center deviates from the center of the reflective section 32, Once the light is received by the detector units 80, 82, they are no longer equal.

Therefore, returning to FIG. 4, the signal from amplifier 86 is the signal from amplifier 90.

, the servo control circuit 62 generates an error signal and the amplifier 86 . 90 by moving read/write head 14 in the direction necessary to re-equalize the signals from 90. The servo motor 60 is operated so as to The servomechanism that makes such corrections is publicly available. It belongs to knowledge.

In order to better distinguish between the separate optical signals received by the detector units 80 and 82, In order to replace the light pipe 28 in Fig. 2 and the light non-eve 7-0 in Fig. 4, Can be used for split light 9ide 120 (FIG. 6). Light Yai f 120 is divided into a first light tube 122 and a second light tube for transmitting light signals. It is configured separately from the pipe 124. The light pipe 120 is connected to the servo motor by the arrow 56. to the read/write head 14 such that the light pi f120t-moves in the direction of Directed.

Figures 7 to 10 indicate other features of the irradiation and detection section of the optical system that can be used in this invention. It is a column. The single light pipe in Figure 7 illuminates and detects the surface of the disk 100. used for both. In this case, the single write nip 130 has a step index. Irradiation of dust onto the surface of the disk 100 using optical fibers and the above-mentioned As mentioned above, the disk 10 is also used for both receiving and receiving the light beam reflected from the optical sensor. be done. Lens 132 focuses the light onto spot 54 as described in FIG.

In FIG. 8, the reflected light passes from the disk 10 to the sensor explained in FIG. The light pipe includes a step index optical fiber 140; Its terminal end 142 is optically connected to a length of graded index fiber 144. It will be done. The tilted index fiber 144 directs light nozzles to spots such as those described above. It acts as a lens that condenses <1 of 4 ide.

FIG. 9 has a core 150 of graded index optical fiber, Layer coated with 1520 layers of step index optical fiber An example of ittsuyabe. Nine irradiation sources 154, supplied from a suitable power source 156, are connected to layer 1. 52t - optically connected to layer 152 for irradiation and from which disk 100 Irradiate the surface. The optical core 150 of the graded index fiber is As described above, the light flux from the light/-eve is focused on the suit of the disk IO.

Figure 1O shows the irradiation of the disk IO and the guideline recorded on the disk IO. The light beam used for both detection and detection of the light reflected from the disk with the image of the This example shows a hole that passes through the hole. A read/write head similar to read/write head 14 shown in FIG. The head 160 has a hole 162 through which the light coaxially passes. The light beam 164 passes through the hole. The lens 166 is oriented to illuminate the disk 10 and the lens 166 is centered in the aperture 162. , as mentioned above, the 0 first condensing light beam is detected so as to detect the K light flux (spora of the disk 10). In the case of the 0@ array, the air itself is used to guide the light flux, but the air itself is used as shown in Figure 4. 4, using a mirror such as mirror 72, which is used to The light must be precisely aligned with the hole to guide the reflected light into the sensor. stomach.

FIG. 1 FIG.

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Claims (1)

[Claims] 1. A substrate (30) and a plurality of data provided on the substrate. Magnetic 1 material with track A reader for magnetically reading and writing data from a magnetic recording medium (10) containing a recording medium (36). A magnetic recording medium for use in a device having a read/write head (14), the recording medium comprising: Includes a plurality of optical guidelines (20) recorded on a medium (10), one guideline An input (20) is associated with each data track, and said guideline (20) is associated with said guideline (20). said read/write head (14) adjacent to a selected one of the guidelines (20); can be used by said device to locate said guideline (20) and track said guideline (20) A magnetic recording medium. 2. The recording medium is in the form of a disc (10), and the optical guideline (2) is in the form of a disc (10). 2. A recording medium according to claim 1, wherein 0) is in the form of concentric circles of the substrate (30). 3. Each guideline (20) is intermittently interrupted (at 22) to a code representing a code identifying the magnetic track (20) and its associated magnetic track; The recording medium according to claim 2, wherein the recording medium is provided with line segments having a length of body. 4. The guideline (20) is recorded on the substrate (30), and the guideline (20) is recorded on the substrate (30). ) in which the magnetic material (36) is placed, and the magnetic material (36) is operated by the device. claim 2, which is transparent to enable reading of said optical guideline (20) by The recording medium described in box 2. 5. A recording medium that magnetically writes and reads data on one of a plurality of data tracks ( 10) for selectively positioning the magnetic read/write head (14) relative to the magnetic read/write head (14); optical discs recorded on said recording medium and respectively associated with one of said data tracks; light source means (26, operatively positioned to illuminate the guideline (20); 63, 64, 66) and the light reflected from one of said optical guidelines (20) ( 46, 74); Reflected light (46, 74) received by the light recording detection means (28, 70, 76) ) in accordance with the position of the previous writing/writing head (14) with respect to the recording medium (10). and servo means (60) operative to adjust the position of the magnetic read/write head. Placement device. 6. The light sensing means includes an optical fiber (28) and the light source means comprising a plurality of separate illumination fibers (26), said illumination fibers (26) said at least one end (42) of the optical fiber (28) of the light detection means. and distributed around its periphery and positioned adjacent to said read/write head (14). Claim 5, characterized in that the recording medium (10) is irradiated with light. The device described. 7. guideline identification information represented by the guideline (20) of the recording medium; 6. Apparatus according to claim 5, comprising decoding means (100) for decoding. 8. Guidelines related to desired data tracks of the recording medium (10) (20); means for identifying the desired guideline; and recording means (1). 00) to the current guideline identification; and the servo means (6 0) for controlling said servo means (60) to determine the current guideline. Position the read/write head (14) from (20) to the desired guideline (20). 8. Apparatus according to claim 7, comprising means (62) adapted to move. 9. The light sensing means (76) comprises a pair of light sensing elements (80, 82) and two separate a split light pipe (120) with a light guide (122, 124), The light guide is optically coupled to each one of the light sensing elements (80, 82) and The optical element is configured to receive light reflected from one of the optical guidelines (20). The actuator acts to generate an electrical signal according to the input acting on it and the light irradiated on said input. The front servo means (60) has an output of the sensing element (80, 82). comprising comparison means (62) for comparing electrical signals applied to the Read/write until the electrical signals from the outputs of the light sensing elements (80, 82) are equal. 6. Apparatus according to claim 5, including correction means for adjusting the position of the loading head (14). 10. Position the read/write head adjacent to the recording medium to write and read data. A method for attaching an optical guide to a recording medium, the method comprising: providing an optical guide on the recording medium; illuminating the guideline with a light source means and detecting the light reflected from one of said optical guidelines. and selecting a plurality of data tracks of the recording medium in response to the detection of the reflected light. the read/write head on the recording medium in read/write relation to one of the positioning of the optical guideline of a plurality of data tracks of the recording medium; reading, including the steps of magnetically writing and reading data to and from each associated one; / How to position the write head.