WO1998016925A1

WO1998016925A1 - Magnetic head device and magnetic disk device

Info

Publication number: WO1998016925A1
Application number: PCT/JP1997/003699
Authority: WO
Inventors: Masayuki Nakayama; Hiraku Akiho; Koji Takahashi
Original assignee: Sony Corporation
Priority date: 1996-10-15
Filing date: 1997-10-14
Publication date: 1998-04-23

Abstract

A magnetic head for a flexible disk which is compatible with the conventional specifications having slow disk rotation speeds such as in microfloppy disk, and which performs recording and/or playback of information to and from the rotating flexible disk. At least a part of the area of the medium sliding surface on which the flexible disk slides is constituted of a curved surface having a curvature in the disk rotation direction so that the disk will not float too much when the disk rotation speed is increased, thereby permitting good recording and/or playback operation.

Description

^Item: head apparatus and a magnetic disk apparatus Technical Field The present invention to magnetism, provided with a head device records information on the magnetic disk that is rotated and / or to the magnetic reproducing the head apparatus and the magnetic The present invention relates to a magnetic disk device, and more particularly to a magnetic head device and a magnetic disk device suitable for use when a magnetic disk is a flexible disk and the flexible disk is driven to rotate at high speed. BACKGROUND ART A magnetic disk has a magnetic recording layer formed on one main surface or both main surfaces of a disk substrate. Known magnetic disks include a so-called hard disk in which a disk substrate is formed of glass, aluminum, or the like, and a flexible disk in which a disk substrate is formed of a thin synthetic resin. For a hard disk that is driven to rotate at a relatively high speed, a floating magnetic head device that records and / or reproduces information while floating from the main surface is used. For a flexible disk that is driven to rotate at a relatively low speed, a sliding magnetic head device that records / reproduces information while maintaining a sliding state with respect to the main surface thereof is used.

The magnetic head 100 shown in FIG. 1 and FIG. This is a conventional magnetic head mounted on a sliding-type magnetic head device for recording and / or reproducing information from both the front and back main surfaces of the kibble disk 110. The magnetic head 100 includes a read / write core member 101, an erase core member 102, and a slider member 103. The lead core member 101 and the erase core member 102 are formed in a thin plate shape from a magnetic material such as ferrite, permalloy, or sendust.

The lead core member 101 is formed by fusing a pair of core halves 101 a and 101 b with, for example, glass, and a lead gear gap 104 is formed at the fusion part. A read / write coil (not shown) is attached to the core halves 101a and 101b of the lead / write core member 101. A back core member (not shown) that connects the core halves 101 a and 101 b to form a closed magnetic circuit is fixed to the dry core member 101.

The erase core member 102 is formed by fusing a pair of core halves 102 a and 102 b with, for example, glass, and an erase gap 105 is formed at the fused portion. An erase coil (not shown) is attached to the core halves 102 a and 102 b of the release core member 102. A back core member (not shown) that connects the core halves 102 a and 102 b to form a closed magnetic circuit is fixed to the erase core member 102.

The slider member 103 is formed of, for example, a non-magnetic material having excellent wear resistance. The slider member 103 has a disk facing surface 103 a that rubs the main surface of the flexible disk 110. The slider member 103 has a flexible disk indicated by an arrow A in FIG. 1 at the center in the width direction of the disk facing surface 103 a. A group 106 is provided over the entire area of the scanning direction A of 110. In the group 106, the disk facing surface 103a of the slider member 103 is divided into two regions of a first region 103b and a second region 103c in the width direction.

The lead core member 101 and the erase core member 102 are such that the lead core member 101 precedes the core member 102 in the scanning direction A to the flexible disk 110. On the side, each of which has its longitudinal end face joined by glass 107. The read / write core member 101 and the erase core member 1◦2 have the lead / write gap 104 and the formation surface of the erase gear gap 105 and the disk facing surface 100 3c, and is fixed to the side surface in the width direction with respect to the slider member 103.

The read core member 101 and the erase core member 102 are incorporated in the first region 103 b with respect to the slider member 102. The read-out core member 101, the erase core member 102, and the slider member 103 each have a gap forming surface 101c, 102c, and a disk facing surface 103c as a whole. The disk facing surface 1 08 that rubs the main surfaces 1 110 a and 110 b of 110 is formed.

The magnetic head 100 configured as described above faces the flexible disk 110 as shown in FIG. 2 so as to face the main surfaces 110 a and 110 b of the front and rear surfaces, respectively. A pair of magnetic heads 100 A and 100 B are provided. The magnetic heads 100 OA and 100 B are not symmetrical with respect to the main surfaces 110 a and 110 b of the flexible disk 110, that is, their mutual dry gaps 1 04 pairs with each other PC JP

It is arranged not to face. The magnetic heads 100 A and 100 B are arranged such that the disk facing surface 108 is kept in a sliding state with respect to the main surfaces 110 a and 110 b on both the front and back sides of the rotatably driven flexible disk 110. Supported by The magnetic heads 100 A and 100 B are used as recording tracks formed concentrically on the main surfaces 110 a and 110 b of the front and back sides of the flexible disk 110 by the re-write gap 104. Record information or play recorded information as a recording track.

The magnetic head 100 erases both end portions of the information recorded on the recording tracks of the flexible disk 110 by the release gap 105 and forms a guard band which is a non-recording zone of information between the recording tracks. To achieve.

As described above, the magnetic head 100 records and / or reproduces information while the disk facing surface 108 is kept in a sliding state with respect to the flexible disk 110. Therefore, it is necessary that the magnetic head 1◦0 makes good contact with the main surfaces 110a and 110b on both the front and back sides of the flexible disk 110 to obtain stable output characteristics. In addition, the magnetic head 100 is required to slide smoothly without damaging or excessively abrading the disk facing surface 108 or the main surface of the flexible disk 110.

The magnetic disk 100 has both ends in the scanning direction A, i.e., the side preceding the rotatably driven flexible disk 110, so that the main surface of the magnetic disk 100 is not damaged when accessing the flexible disk 110. The chamfered portions 109a and 109b are chamfered so that the edge of the rear surface and the rear edge are curved. Magnetic disk 1 0 0 indicates that the entire surface of the flexible disk 110 except for the chamfered portions 109 a and 109 b is set with respect to the main surface 110 a and 110 b of the flexible disk 110. It is configured as a flat surface so that it contacts in a stable state.

The flexible disk 110 is driven to rotate at a relatively low rotation speed of about 300 rpm to about 600 rpm.

By the way, a flexible disk recording and / or reproducing apparatus has a higher storage capacity than a flexible disk recording and / or reproducing apparatus for recording and / or reproducing information on the conventional flexible disk 110 described above. Recording of information on flexible disks and

A flexible disk recording and / or reproducing apparatus that can perform reproduction and / or is compatible with the conventional flexible disk 110 is expected.

In such a flexible disk recording and / or reproducing apparatus, it is necessary to increase the recording density in order for the flexible disk to have a high information storage capacity. If the surface is scratched, good recording and / or reproduction of information may not be possible.

Therefore, the flexible disk recording and / or reproducing apparatus is designed to prevent the magnetic disk from sliding on the main surface of the flexible disk to damage the flexible disk. In the same manner as described above, it is necessary to record and / or reproduce information while the magnetic head is floated on a high-capacity flexible disk. However, the recording and / or reproducing apparatus of a flexible disk does not allow the magnetic head to fly above the flexible disk. If it becomes larger, it becomes impossible to record and / or reproduce information. Therefore, it is necessary to reduce the flying height as much as possible.

According to the present invention, a magnetic disk having a low storage capacity, which is driven to rotate at a relatively low speed, is kept in a contact state to record and / or reproduce information, and is driven to rotate at a relatively high speed A magnetic head device and a magnetic head device for enabling recording and / or reproduction of information while maintaining a small flying height with respect to a magnetic disk having a high storage capacity are provided. It is intended to provide a magnetic disk drive. DISCLOSURE OF THE INVENTION A magnetic head device according to the present invention that achieves the above-described object records and records information on a magnetic disk by moving a transducer relative to a main surface of a magnetic disk that is rotationally driven. / Or play. The magnetic head device includes a slider having a magnetic disk facing surface facing the magnetic disk, and a transducer means provided on the slider facing the magnetic disk to record and / or reproduce information on the magnetic disk. Prepare. The slider includes a first region having a substantially flat magnetic disk facing surface and a second region having a curved surface protruding closer to the magnetic disk than the first region. The transducing means is provided in the second area.

A magnetic disk drive according to the present invention that achieves the above-described object includes: a rotating unit that drives a magnetic disk to rotate; a magnetic head that records or reproduces information on the magnetic disk; And a magnetic head holding means arranged to face the signal recording surface. The magnetic head includes a slider having a magnetic disk facing surface facing the magnetic head, and a transducer provided on the magnetic disk facing surface for recording and / or reproducing information on the magnetic disk. Is provided. The slider includes a first region having a substantially flat magnetic disk facing surface, and a second region having a curved surface protruding closer to the magnetic disk than the first region. The transducing means is provided in the second area.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a main part of a conventional magnetic head.

FIG. 2 is a longitudinal sectional view of an essential part showing a state in which information is recorded and / or reproduced on a magnetic disk using a conventional magnetic head.

FIG. 3 is a block diagram of a disk drive device provided with the magnetic head device according to the present invention.

FIG. 4 is a perspective view showing a magnetic head device according to the present invention.

FIG. 5 is a perspective view of a magnetic head device according to the present invention.

FIG. 6 is a plan view of a magnetic head according to the present invention.

FIG. 7 is a side view of the magnetic head according to the present invention.

FIG. 8 is a vertical cross-sectional view of a main part showing a first head constituting the magnetic head according to the present invention.

FIG. 9 is a longitudinal sectional view of a main part showing a second head part constituting the magnetic head according to the present invention. FIG. 10 is a front view of an essential part for explaining the configuration of the disk facing surface of the magnetic head according to the present invention.

FIG. 11 is a front view of an essential part for explaining the configuration of a disk-facing surface of another magnetic head according to the present invention.

FIG. 12 is a longitudinal sectional view of an essential part showing a state in which information is recorded and / or reproduced from a magnetic disk using another magnetic head according to the present invention.

Fig. 13 is an explanatory diagram for simulating the relationship between the flying speed of the magnetic head and the relative speed between the flexible disk and the magnetic head and the radius of curvature of the disk facing surface of the magnetic head. is there.

FIG. 14 shows the result of the simulation. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, specific embodiments of a magnetic head 1 according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 3, a magnetic head 1 shown as an embodiment includes a pair of magnetic heads 1 A opposed to main surfaces 2 a and 2 b on both front and back sides of a flexible disk 2 that is driven to rotate. , 1B are arranged and mounted on a magnetic head device 3 for recording and / or reproducing information. The magnetic head 1, which will be described in detail later, has a first flexible disk 2A and a second flexible disk 2B having different specifications, which enable recording and / or reproduction of information respectively. It is configured as a composite magnetic head composed of a head portion 22 of the first magnetic head and a second head portion 23 of the second magnetic head. The magnetic head device 3 is mounted or connected to a main device such as a personal computer processor. Provided in the magnetic disk device 4.

The flexible disk 2 has a diameter of 3.5 inches and is rotatably stored in the cartridge 5. As the flexible disk 2, a first flexible disk 2A and a second flexible disk 2B having different specifications are used.

When the flexible disk 2 is loaded into the magnetic disk device 4, the first flexible disk 2A and the second flexible disk 2B are identified by the disk specification identifying section 6 provided in the cartridge 5. You. The first flexible disk 2A is driven to rotate at a high speed of 360 rpm. The second flexible disk 2B is rotationally driven at a rotational speed of 300 rpm. Although the details are omitted, the disc specification identifying unit 6 is provided, for example, near one corner of the cartridge 4 and is an identifier that is operated to switch between the first position and the second position. And an identification hole opened and closed by the identifier. The magnetic disk drive 4 includes a disk table 8 for magnetically chucking the hub 7 of the loaded flexible disk 2, a spindle motor 9 having a spindle shaft 9a for driving the disk table 8 to rotate, and a magnetic head. And a head support drive mechanism 10 that supports the head device 3. The magnetic disk unit 4 includes a main control unit 11, an interface unit 12, an information processing unit 13, a disk identification unit 14, a motor drive control unit 15, and a voice coil motor unit 16. And a head drive control unit 17.

The magnetic disk device 4 includes a head support drive mechanism 10 including a carriage 18 on which the magnetic head device 3 is mounted and a pair of suspensions 19. As described above, the magnetic disk drive 4 A voice coil module 16 is provided to more precisely control the position of the magnetic head 1 with respect to the first flexible disk 2A having a narrower rack pitch.

The magnetic disk device 4 forms a recording track on the first flexible disk 2A with a pitch of 10 microns at the time of formatting, and divides the recording disk into an area such as a data zone and a landing zone. The magnetic disk device 4 records data (gray code) indicating a recording track address in the landing zone of the first flexible disk 2A. When the first flexible disk 2A is loaded, the magnetic disk device 4 reads out the gray code from the first flexible disk 2A and performs tracking servo of the magnetic head device 3. When the second flexible disk 2B is loaded, the magnetic disk device 4 records and / or reproduces information without performing a tracking servo of the magnetic head device 3.

The voice coil motor 16 can precisely control the moving amount of the head support drive mechanism 10 depending on the magnitude of the input current and the time during which the input current is supplied. Therefore, when the first flexible disk 2A is loaded, the magnetic disk device 4 first drives the head support driving mechanism 10. The magnetic head device 3 is thereby precisely located in the landing zone. The magnetic disk device 4 reads out the gray code using the magnetic head 1 of the magnetic head device 3 to recognize the position of the recording track and the position of the recording track to be moved.

The interface unit 12 forms an interface between the magnetic disk device 4 and a main unit (not shown), and includes an information interface and a power supply interface. The information processing unit 13 is connected via the main control unit 11 The information supplied from the interface unit 12 is encoded so as to conform to the recording format of the flexible disk 2. The information processing unit 13 decodes information reproduced from the flexible disk 2 by the magnetic head device 3 and sends out the decoded information to the interface unit 12 via the main control unit 11.

The disc identification unit 14 includes, for example, an optical detector (not shown) including a light-emitting element and a light-receiving element that are opposed to the disc specification identification unit 6 of the loaded force cartridge 4. The disk identification section 14 is driven by a drive signal output from the main control section 11 to identify the setting state of the disk specification identification section 6 of the flexible disk 2. The disk identification unit 14 detects the presence or absence of the identification hole of the disk specification identification unit 6 and determines whether the flexible disk 2 loaded in the main control unit 11 is the first flexible disk 2A. Supply the type information as to whether the disk is flexible disk 2B.

The motor drive controller 15 drives the spindle motor 9 to rotate by a drive signal based on the type information from the main controller 11. As described above, the spindle motor 9 is rotationally driven at a rotation speed of 360 rpm in the case of the first flexible disk 2A via the spindle axis 9a and the disk table 8, In the case of the second flexible disk 2B, it is driven to rotate at a rotation speed of 300 rpm.

When the flexible disk 2 is loaded into the magnetic disk device 4, the identification information of the flexible disk 2 detected by the disk identification unit 14 is supplied to the main control unit 11. When the identification information indicates the first flexible disk 2A, the main controller 11 controls the first drive controller 15 to control the first flexible disk 2A. The disk 2A is driven to rotate at a rotation speed of 360 rpm. When the identification information indicates the second flexible disk 2B, the main control unit 11 controls the motor drive control unit 15 to store the second flexible disk 2B in the 30 It is driven to rotate at a rotation speed of 0 rpm. When the first flexible disk 2A is loaded, the main control unit 11 controls the head drive control unit 17 based on the servo information obtained via the information processing unit 13, and Perform tracking servo of head device 3. When the second flexible disk 2B is loaded, the main control section 11 moves the magnetic head device 3 along the track pitch so that the magnetic head device 3 moves in the radial direction of the second flexible disk 2B. Drive control section 17 is controlled.

When the interface unit 12 receives a recording command from a main unit (not shown), the main control unit 11 sends the recording command to the main unit (not shown) via the interface unit 12 following the recording command. The supplied information is supplied to the information processing unit 13. The information processing section 13 encodes the information supplied from the main control section 11 so as to conform to the recording format and supplies the information to the magnetic head device 3.

When the interface section 12 receives a playback command from a main unit (not shown), the main control section 11 controls the head drive so that the address information specified by the playback command is played back. The unit 17 is controlled so that information is reproduced by the magnetic head device 3. The reproduced information is decoded by the information processing unit 13 and transmitted to a main device (not shown) via the main control unit 11 and the interface unit 12.

As shown in FIGS. 4 and 5, the magnetic head device 3 includes a composite magnetic head 1 described in detail below, a gimbal panel 20, and a flexible wiring base. And a plate 35. The gimbal panel 20 is formed in a substantially rectangular shape by an elastic plate, and is fixed to the suspension 19 via a mounting hole 20a provided in a peripheral portion. As shown in FIG. 4, the gimbal panel 20 has an annular groove 20 d and 20 h to form a base 20 j, an annular elastic displacement section 20 e, and a head mounting section 20 i. It is classified. The base part 20 j and the elastic displacement part 20 e are connected by two connecting pieces 2 Ob and 20 c. The elastic displacement part 20 e and the head mounting part 20 i are connected by two connecting pieces 20 f and 20 g.

The flexible wiring board 35 has one end connected to each terminal of the composite magnetic head 1 and the other end connected to a preamplifier (not shown).

The magnetic head device 3 is, as described above, a first head unit (first transducer) for recording and / or reproducing information on the first flexible disk 2A. And a second magnetic head 1 (second transducer) 23 for recording and / or reproducing information on the second flexible disk 2B. Is done. As shown in FIG. 6, the composite magnetic head 1 has a substantially rectangular disk facing surface 24. The disk facing surface 24 is composed of a first region 24 a at a peripheral portion which is substantially flat, and a second region 24 b within a region having a radius R from the center P 0 which is a convex curved surface. . A group 25 is provided on the disk facing surface 24 over the entire area of the flexible disk 2 in the scanning direction A, which is located at the center in the width direction (t2 direction). As shown in FIGS. 6 and 7, the disk facing surface 24 is divided into two portions, a first portion 26a and a second portion 26b, in the width direction by a groove 25. . The composite magnetic head 1 has a length t1 of 3.0 mm in the disk scanning direction A and a width t2 of 2.8 mm. The composite magnetic head 1 has a maximum height of 2.7 mm. The group 25 is composed of a composite magnetic head 1 having a width t4 of 0.4 mm and a lead core member 27 formed of ferrite, for example, and a non-magnetic material such as ceramic. A pair of auxiliary block members 28a and 28b constitute a first head portion 22 for recording and / or reproducing information on the first flexible disk 2A. The composite magnetic head 1 is composed of a second core member 31 and a second core member 31 fixed to the disk scanning direction A with a nonmagnetic material such as glass 29 interposed therebetween. A second head section 22 for recording and / or reproducing information on the flexible disk 2B is configured. The second head section 23 includes an erase core member 3 for forming a guard band, together with a lead core member 30 for recording and / or reproducing information on the second flexible disk 2B. It is configured with 1.

The lead core member 30 and the erase core member 31 are formed of, for example, a ferrite material. The read / write core member 30 and the erase core member 31 are arranged in series in the disk scanning direction, thereby defining the length t1 of the composite magnetic head 1 in the disk scanning direction A.

The composite magnetic head 1 includes a first slider member 32 and a second slider member 33 that support the first head portion 22 and the second head portion 23. What is the first slider member 32 and the second slider member 33? It is formed of a non-magnetic material such as a ceramic. The composite magnetic head 1 includes a spacer member 34 that magnetically separates the first head portion 22 and the second head portion 23. The spacer member 34 is formed of, for example, a nonmagnetic material such as ceramic.

Auxiliary block members 28a and 28b are fixed to both sides of the lead core member 27 in the disk scanning direction A by a non-magnetic material such as glass. The joined body of the read core member 27 and the auxiliary block members 28a, 28b is equal to the length of the first slider member 32 in the disk scanning direction A, and the disk of the composite magnetic head 1 is Specifies the length t1 of the scanning direction A. The lead core member 30 and the erase core member 31 are fixed via the glass 29 so that the length of the disk scanning direction A is made equal to the length of the first slider member 32. I have. The length of the spacer member 34 in the disk scanning direction A is made equal to the length of the first slider member 32.

The composite magnetic head 1 has the above-described members fixed as shown in FIGS. In other words, the first slider member 32 has a first head part 22 formed on a side face on the first part 26 a side divided by a groove 25, and a lead core member 27 forming a first head part 22. The joined body with the auxiliary block members 28a and 28b is fixed by a nonmagnetic material such as glass. In the joined body of the lead core member 27 and the auxiliary block members 28a and 28b, a spacer member 34 is fixed to the other side surface by a nonmagnetic material such as glass.

In the spacer member 34, the joined body of the dry core member 30 and the erase core member 31 constituting the second head portion 23 on the other side surface is made of a non-magnetic material such as glass. Fixed. Re-dry A second slider member 33 is fixed to the other side of the joined body of the core member 30 and the erase core member 31 with a nonmagnetic material such as glass.

The composite magnetic head 1 includes the above-described lead core member 27, auxiliary block members 28a and 28b, lead core member 30, erase core member 31, first slider member 32, and first slider member 32. As shown in FIG. 7, each of the two slider members 33 and spacer members 34 is fixed so that the upper surfaces thereof are flush with each other, thereby forming the disk facing surface 24. Therefore, as shown in FIG. 6, the composite magnetic head 1 is composed of the first head 2 2 and the second head 23, the first part 2 of which is divided by the group 25. 6a is arranged. In the composite magnetic head 1, the first head portion 22 is disposed on the group 25 side with respect to the second head portion 23.

As shown in FIG. 8, the composite magnetic head 1 includes a read-write coil 36 assembled to a read-write core member 27 of the first head portion 22. As shown in FIGS. 5 and 9, the composite magnetic head 1 is assembled to a lead coil 37 attached to a lead core member 30 of a second head part 23 and an erase core member 31. Equipped with a coil 38. Each of the lead light coil 36, the lead light coil 37 and the erase coil 38 is formed by winding a coil bobbin. Through 20 i, it is connected to the flexible wiring board 35.

The composite magnetic head 1 is, as shown in FIG. 8, a back core part which is assembled to a lead core member 27 constituting the first head part 22. Material 9 is provided. The back core member 39 is assembled to the lead core member 27 to form a closed magnetic circuit. As shown in FIG. 9, the composite magnetic head 1 includes a back core member 40 that is assembled to a read-write core member 30 that forms the second head part 23. The knock core member 40 is assembled to the lead core member 30 to form a closed magnetic circuit.

As shown in FIG. 9, the composite magnetic head 1 includes a back core member 41 that is assembled to an iron core member 31 that forms the second head part 23. The back core member 41 is assembled to the erase core member 31 to form a closed magnetic circuit. Each of the back core members 39, 40, 41 is also formed of, for example, a ferrite material. The first head section 22 will be described in detail with reference to FIG. In FIG. 8, the upper surface constituting the disk facing surface 24 is illustrated as an exaggerated curved surface. As described above, the first head portion 22 includes a lead core member 27, a pair of auxiliary block members 28 a and 28 b, a lead core coil 36, and a back core member 40. And The first head unit 22 reproduces information recorded on the first flexible disk 2A or records information. The lead core member 27 includes a substantially inverted L-shaped first core half 43 and a substantially I-shaped second core half 44 constituting the magnetic gap 42.

The lead core member 27 is formed by moving the first core half 43 in the disk scanning direction A so as to form a space 45 on the bottom surface opposite to the upper surface 27a constituting the disk facing surface 24. And is fixed to the second core half 44 by a non-magnetic material such as glass. Do it. The lead core member 27 is filled with glass in a minute gap formed between the end face 43a of the first core half 43 and the end face 44a of the second core half 44 facing each other. Thus, a re-dried magnetic gap 42 is formed.

The read-write magnetic gap 42 is formed on the end face 43 a of the first core half 43 and the end face 44 a of the second core half 44 by a magnetic metal film having a high magnetic permeability such as a sendust. Is formed as a so-called metal-in-gap by forming a film by the sputtering method. The magnetic characteristics of the read-write magnetic gap 42 are improved by the action of the magnetic metal film as compared with the second head portion 23.

The read / write core member 27 forms a second head section 23 for recording and / or reproducing information on the first flexible disk 2A having a narrow recording track. The overall width is narrower than that of the core member 30 and the erase core member 31, and crosstalk between recording tracks is reduced. The first head section 22 is a magnetic head such as an information recording density and a data transfer rate by reducing the size of the read-write core member 27 to reduce the magnetic resistance and suppress the head impedance. The characteristic is improved.

After the first head half 43 is assembled with the first core half 43 and the second core half 44, respectively, the lead coil 36 is assembled thereto, the first core half 43 and the first core half 43 are formed. The back core member 39 is fixed between the two core halves 44. The first head section 22 has mechanical strength and improved abrasion resistance by fixing auxiliary block members 28 a and 28 b on both sides of the lead core member 27 in the disk operation direction A. Is achieved. The first head portion 22 has an upper surface 27a of the read-write core member 27 which flies at a minute interval with respect to the main surface 2a of the first flexible disk 2A which is rotationally driven. The information to be recorded is recorded as a magnetic signal through the read-write magnetic gap 42 while the state is maintained. The first head portion 22 has a state in which the upper surface 27a of the lead-write core member 27 flies at a small interval with respect to the main surface 2a of the first flexible disk 2A that is driven to rotate. The stored information is read out as an electrical signal through the read-write magnetic gap 42.

Next, the second head section 23 will be described in detail with reference to FIG. In FIG. 9, the upper surface of the disk facing surface 24 is shown as an exaggerated curved surface. As described above, the second head portion 23 includes a read core member 30, an erase core member 31, a read core coil 37, an erase coil 38, a knock core member 40, and a back core member 40. The core member 4 1. The second head part 23 is constituted by a tunnel erase type bulk type head. The read-write core member 30 and the erase core member 31 are arranged such that the read-write core member 30 is located on the leading side in the disk scanning direction A as described above. The lead core member 30 and the erase core member 31 are magnetically insulated from each other by a glass 29.

The second head section 23 reproduces information recorded on the second flexible disk 2B or records the information. The lead core member 30 is composed of a substantially inverted L-shaped first core half 48 and a substantially I-shaped second core half 49 constituting a read-light magnetic gap 47. Become. The first core half 48 is arranged in the disk scanning direction A so that the lead core member 30 forms a space 50 on the bottom surface side facing the upper surface 30 a constituting the disk facing surface 24. And is connected to the second core half 49 by glass 55, for example.

Glass is filled in the read-write core member 30 in a minute gap formed between the opposing end faces of the first core half 48 and the second core half 49, and the read-write magnetic A gap 47 is formed. The lead light core member 30 has a first core half 48 and a lead light coil

After assembling 37, the back core member 40 is fixed between the first core half 48 and the second core half 49, and the whole constitutes a closed magnetic circuit.

The lead core member 30 is maintained in a state in which the upper surface 30 a is in contact with the main surface 2 a of the second flexible disk 2 B that is driven to rotate, and the lead core member 30 passes through the read-write magnetic gap 47. Information to be recorded is recorded as a magnetic signal. The read-write core member 30 is maintained in a state where the upper surface 30a is in contact with the main surface 2a of the second flexible disk 2B that is driven to rotate, and the read-write magnetic gap is maintained.

The information recorded via 47 is recorded as an electric signal.

The laser core member 31 is composed of a substantially I-shaped first core half 52 and a substantially inverted L-shaped second core half 53 that constitute the laser magnetic gap 51. Become. The first core half 52 is arranged in the disk scanning direction A so that a space portion 54 is formed on the bottom surface opposite to the upper surface 31 a constituting the disk facing surface 24. The second core half is positioned on the leading side, in other words, on the lead core member 30 side. 5 3 and, for example, glass 56.

The erase core member 31 is filled with glass into a minute gap formed between the opposing end faces of the first core half 52 and the second core half 53 to form the erase magnetic gap 51. Is done. The release magnetic gap 51 is composed of a pair formed in the width direction of the release core member 31 in detail. After the erase coil 38 is attached to the first core half 52, the erase core member 31 extends over between the first core half 52 and the second core half 53. When the back core member 41 is fixed, the whole constitutes a closed magnetic circuit.

The core member 31 is maintained in a state where the upper surface 31a is in contact with the main surface 2a of the second flexible disk 2B that is driven to rotate. When information is recorded on the recording track of the second flexible disk 2B via the above-described read-write magnetic gap 47, a DC signal is supplied to the erase coil 38. Then, both sides of the area where information is recorded by the erase magnetic gap 51 are erased to secure the guard band of the recording track. When the information recorded in this manner is reproduced, the second flexible disk 2B reproduces the information accurately even if the composite magnetic head 1 has a slight positional deviation in the track direction. .

The first slider member 32 is formed of a ceramic or the like of a non-magnetic material having abrasion resistance and mechanical strength, and as shown in FIGS. 6 and 7, the length of the disk scanning direction A is compounded. The length is t 1, which is the same as that of the magnetic head 1, and the width of the dog is slightly smaller than より of the width t 2 of the composite magnetic head 1. As described above, the first slider member 32 has a group 25 formed on the upper surface thereof over the entire area in the disk scanning direction A. I have. The center line of group 25 coincides with the center line of composite magnetic head 1.

As shown in FIG. 7, the first slider member 32 has a convex portion 57 projecting from one side along the disk scanning direction A. The group 25 is formed on the upper surface of the projection 57. The convex portion 57 constitutes a joint between the lead core member 27 constituting the first head portion 22 and the joined body of the auxiliary block members 28a and 28b.

The second slider member 33 is also formed of ceramic or the like of a non-magnetic material having good wear resistance and mechanical strength, and the length in the disk scanning direction A is the same as the length of the composite magnetic head 1. t 1. As described above, the joined body of the lead core member 30 and the erase core member 31 constituting the second head part 23 is fixed to one side surface of the second slider member 33 as described above. . The composite magnetic head 1 is configured such that a first head portion 22 and a second head portion 23 are sandwiched between a first slider member 32 and a second slider member 33. It becomes.

The composite magnetic head 1 configured as described above has a disk facing surface 24 having a feature. The configuration of the disk facing surface 24 will be described in detail with reference to FIG. In the composite magnetic head 1, the circular second region 24b of the disk facing surface 24 has a radius R of 1.25 mm. The second region 24 b has a section formed by a part of a spherical surface having a radius of curvature of 100 O mm. In other words, in the composite magnetic head 1, the second region 24b is formed by a convex curved surface having a radius R1 of 100 mm in the disk scanning direction A and the width direction.

The composite magnetic head 1 scans the disk in the second area 24 b The cross section viewed from the direction A and the cross section viewed from the width direction may be configured to have different radii, but it is preferable that the cross section be the same because the processing of the disk facing surface 24 becomes difficult.

As described above, the composite magnetic head 1 includes the first magnetic head gap 22 and the second magnetic head gap 23 in the second region 24b. One dry magnetic gap 47 and an erase magnetic gap 51 are arranged. The composite magnetic head 1

An arrangement area 24c of 42, 47, 51, that is, an area having a radius r of 0.2 mm from the head center P0 is formed as a flat surface. When recording and / or reproducing information on / from the second flexible disk 2B, the composite magnetic head 1 has a gap arrangement area 24c that is in contact with the main surface 2a of the flexible disk 2B. Is configured. The gap arrangement area 24c is formed by, for example, cutting a second area 24b formed on a convex curved surface.

The composite magnetic head 1 has a chamfered portion 58 formed on the outer peripheral edge of the disk facing surface 24. Specifically, each chamfered portion 58 is formed by forming an area from the outer periphery to 0.3 mm in an arc shape. Beveled part

Numeral 58 serves to prevent the composite magnetic head 1 from contacting the main surface 2a of the flexible disk 2 and damaging the main surface 2a by the outer peripheral edge as described later.

Due to the structure of the disk facing surface 24 described above, the composite magnetic head 1 rotates the first flexible disk 2A at a high speed to rotate the first flexible disk 2A between its main surface 2a and the disk facing surface 24. Due to the levitation force generated by the airflow generated in the air, the levitation phenomenon is less likely to occur, and the flying state is maintained for only a small interval. The composite magnetic head 1 is configured such that the gap arrangement region 24 c is formed as a flat surface, so that the first head portion 22 has a read head with respect to the main surface 2 a of the second flexible disk 2 B. The magnetic gap 42 and the read-write magnetic gap 47 of the second head portion 23 and the erase magnetic gap 51 come into contact with each other in a stable state. The posture of the composite magnetic head 1 is likely to be unstable with respect to the second flexible disk 2B which is driven to rotate at a relatively low speed. The posture of the composite magnetic head 1 is stabilized by the flat surface configuration of the above-described gap arrangement region 24c, and information recording and / or reproduction on the second flexible disk 2B is performed well.

In the composite magnetic head 1, as described above, the first head portion 22 is disposed on the group 25 side with respect to the second head portion 23. In the composite magnetic head 1, the first head portion 22 has a small amount of tilt in the disk scanning direction A between the inner peripheral side and the outer peripheral side of the first flexible disk 2A. The composite magnetic head 1 reduces the magnetic loss of the first head section 22, thereby enabling the recording and / or reproduction of information on the first flexible disk having a narrow recording track. Perform well.

The composite magnetic head 70 shown in FIG. 11 has the disk facing surface 71 configured as a totally convex curved surface. The composite magnetic head 70 does not require an additional process of flattening the gap arrangement region 72 of the disk facing surface 71, thereby reducing costs. Note that the other configuration is the same as that of the composite magnetic head 1 described above, and the description thereof will be omitted by retaining the same reference numerals.

The composite magnetic head 70 is rotationally driven at a rotational speed of 300 r. The information is recorded and / or reproduced while the contact state is maintained with respect to the second flexible disk 2B. On the other hand, the composite magnetic head 70 records and / or records information while flying at a small interval with respect to the first flexible disk 2A rotated at a rotation speed of 360 rpm. Perform playback. By rotating the first flexible disk 2A at such a relatively high speed, the composite magnetic head 70 flies from the first flexible disk 2A, but the disk facing surface 71 The floating phenomenon is reduced by forming the entire surface as a convex curved surface.

As shown in FIG. 12, the above-described composite magnetic head 1 has a pair of composite magnetic heads 1 opposed to the main surface 2a, 2b of the front and back of the flexible disk 2 respectively. A and 1 B are provided. The composite magnetic heads 1A and 1B are symmetric with respect to the disk scanning direction A, that is, such that one first portion 26a is opposed to the other second portion 26b. Will be arranged. By arranging the composite magnetic heads 1A and 1B in this manner, the core members 27, 30 and 31 of the mutual are not magnetically affected by each other.

The composite magnetic heads 1 A and 1 B are provided on the front and back main surfaces 2 a and 2 b with respect to the flexible disk 2 by the first head portion 22 or the second head portion 23. Record and / or play back. The flexible disk 2 is driven to rotate at 360 rpm in the first flexible disk 2A, and is driven to rotate at 300 rpm in the second flexible disk 2B.

The composite magnetic heads 1A and 1B are provided on the first flexible disk 2A on the front and back main surfaces 2a and 2b, respectively. The information is recorded and / or reproduced by the first head unit 22 while the state in which the information 24 is flying at a minute interval is held. When recording and / or reproducing information on the first flexible disk 2A, the composite magnetic heads 1A and IB are based on the control signal output from the main control unit 11 as described above. A tracking servo is performed. The composite magnetic heads 1 A and 1 B are arranged such that the disk facing surfaces 24 are kept in contact with the second flexible disk 2 B on the front and back main surfaces 2 a and 2 b, respectively. Information is recorded and / or reproduced by the head section 23. The composite magnetic heads 1 A and 1 B record information on the recording tracks of the second flexible disk 2 B via a read-write magnetic gap 47 provided on the read-write core member 30 ο

The composite magnetic heads 1A and 1B apply a guard band to a recording track of the second flexible disk 2B on which information is recorded via an erase magnetic gap 51 provided on an erase core member 31. Form. When reproducing information from the second flexible disk 2B, the composite magnetic heads 1A and 1B operate only the read-write magnetic gap 47 and supply signals to the erase coil 38. However, the erase magnetic gap 51 is kept in an inactive state.

In the magnetic head device 3, as described above, the flexible disk 2 is rotated at a high speed to rotate the disk facing surface 24 of the composite magnetic head 1 and the main surface 2 a of the flexible disk 2. A high-speed airflow is generated. The airflow generates a levitation force with respect to the composite magnetic head 1 to separate the disk facing surface 24 from the main surface 2a of the flexible disk 2. The composite magnetic head 1 is Since the magnetic properties between the YAPs 42, 47, 51 and the flexible disk 2 are deteriorated, there arises a problem that information cannot be recorded and / or reproduced properly. The flying height of the composite magnetic head 1 depends on the relative speed between the flexible disk 2 and the composite magnetic head 1, the shape of the disk facing surface 24 of the composite magnetic head 1, and the like.

Figure 13 shows the flying height of the magnetic head as a function of the relative speed between the flexible disk 80 and the magnetic head 90 and the shape of the disk facing surface 91 of the magnetic head 90, that is, the radius RS. FIG. 4 is an explanatory diagram for simulating a relationship.

Figure 14 shows the relative velocity V between the flexible disk 80 and the magnetic head 90 and the magnetic head 9 based on the radius of curvature RS of the disk facing surface 91 of the magnetic head 90 by the same simulation. FIG. 9 is a view showing the result of a flying height H of 0. In Fig. 14, the vertical axis represents the relative speed (m / s) between the flexible disk 80 and the magnetic head 90, and the horizontal axis represents the radius RS (mm) of the disk facing surface 91 of the magnetic head 90. The flying height H (m) of the magnetic head 90 with respect to the flexible disk 80 is (1) 0.5 0m, (2) 0.3〃m, (3) 0.l〃m, ( 4) The results for 0.05 are shown.

In the simulation, as shown in FIG. 13, a magnetic head 90 having a disk-facing surface 91 having a convex curved surface having a constant radius RS with respect to the disk scanning direction A is used. In the simulation, the magnetic head 90 was arranged near the outer periphery of the flexible disk 80, and the relative speed V between the flexible disk 80 and the magnetic head 90 was set. In the simulation, the load pressure of the magnetic head 90 on the flexible disk 80 was kept constant at 5 g to 6 g. The relative speed V between the flexible disk 80 and the magnetic head 90 is about 1 m / s when the flexible disk 80 is rotationally driven at a rotation speed of 300 rpm. The relative speed V between the flexible disk 80 and the magnetic head 90 is about 4 m / s or more when the flexible disk 80 is driven to rotate at a rotation speed of 1000 rpm.

As described above, the composite magnetic head 1 is a state in which the main surface 2a of the first flexible disk 2A is fluttered at a small interval, and the recording and / or reproduction of information is maintained while the pseudo contact state is maintained. Do. The composite magnetic head 1 has an interval, that is, an allowable range of the flying height H, of up to about 0.1 μm in order to record and / or reproduce information with high accuracy.o

As is clear from the simulation results shown in FIG. 14, the magnetic head 90 is paraphrased as the relative velocity V between the flexible disk 80 and the magnetic head 90 increases. For example, as the flexible disk 80 is driven to rotate at a high speed, the flying height H increases. As can be seen from the simulation results shown in FIG. 14, the magnetic head 90 becomes smaller as the radius RS of the disk facing surface 91 becomes smaller, in other words, as the disk facing surface 91 becomes flatter. Therefore, the flying height H increases.

When the relative velocity V is about 1 m / s, as in the case of the second flexible disk 2B, the magnetic head 90 has a very small flying height H regardless of the shape of the disk facing surface 91. It is within the allowable range of 0.1 / m described above. When the relative velocity V is 4 m / s or more, as in the case of the first flexible disk 2A, the magnetic head 90 is moved to the disk facing surface 91. The smaller the radius RS, the larger the flying height H, which exceeds the above-mentioned 0.1 m tolerance.

Therefore, when the relative speed V of the magnetic head 90 with respect to the flexible disk 8 ° is about 4 m / s, and the flying height H is within the allowable range of 0.1 lm, the magnetic head 90 has a surface facing the disk 91. It is understood that the radius should be 100 mm or more. INDUSTRIAL APPLICABILITY As is clear from the above description, according to the magnetic head device of the present invention, even when the flexible disk is rotated at a high speed, the disk-facing surface is the main surface of the flexible disk. The flying height from the surface is suppressed, and information recording and / or reproduction is performed in a good state. In addition, a magnetic disk device equipped with a magnetic head device is driven at a relatively low speed to rotate and drive a magnetic disk to record and / or reproduce information, and to achieve high-density recording of information. Also used as a magnetic disk, which is rotated and driven at relatively high speed to record and / or reproduce information, and can record and / or reproduce information with high precision. .

Claims

The scope of the claims

1. In a magnetic head device that records or reproduces information on the magnetic disk by moving the transducer relative to the main surface of the rotating magnetic disk,

A slider having a magnetic disk facing surface facing the magnetic disk,

A transducer provided on the surface of the slider facing the magnetic disk for recording and reproducing information on and from the disk;

The magnetic disk facing surface of the slider includes a first region that is substantially flat, and a second region that is a curved surface protruding closer to the magnetic disk than the first region,

The magnetic head device, wherein the transducing means is provided in the second region.

2. A groove that divides the second region into a first portion and a second portion on the surface of the slider facing the magnetic disk from the front end to the rear end in the scanning direction of the magnetic disk. The magnetic head device according to claim 1, wherein a magnetic head is provided.

3. The transducing means comprises a first transducer and a second transducer,

3. The magnetic head according to claim 2, wherein the first transducer and the second transducer are both provided in one of the first part and the second part. Head device.

4. The first transducer is used for high-density magnetic disks. 4. The magnetic disk device according to claim 3, wherein the second transducer is for a low-density magnetic disk.

5. The magnetic head device according to claim 4, wherein the first transducer is provided closer to the groove than the second transducer.

6. The method according to claim 4, wherein the first transducer and the second transducer are provided at a substantially central portion of the surface facing the magnetic disk in the disk scanning direction. Magnetic head device.

7. The magnetic head according to claim 1, wherein the second region is constituted by a surface of a sphere having a predetermined radius.

8. The magnetic head device according to claim 7, wherein the second region is constituted by a surface of a sphere having a radius of 100 mm or more.

9. The magnetic disk drive according to claim 1, wherein the transducing means is provided substantially at a center of the magnetic disk facing surface in the disk scanning direction.

10. A rotating means for rotating the magnetic disk,

A magnetic head for recording or reproducing information on or from the magnetic disk;

Magnetic head holding means for arranging the magnetic head so as to face the signal recording surface of the magnetic disk,

The magnetic head is opposed to the magnetic disk facing the magnetic head. A slider having a surface, and transducing means provided on the surface of the slider facing the magnetic disk for recording and reproducing information on and from the magnetic disk.

The magnetic disk device, wherein the transducing means is provided in the second area.

11. On the surface of the slider facing the magnetic disk, the second area is divided into a first part and a second part continuously from the leading end to the trailing end in the scanning direction of the magnetic disk. 10. The magnetic disk drive according to claim 10, wherein a groove is formed.

1 2. The above-mentioned transducing means comprises a first transducer and a second transducer,

11. The method according to claim 11, wherein both the first transducer and the second transducer are provided in one of the first part and the second part. Magnetic disk drive.

13. The method according to claim 12, wherein the first transducer is for a high-density magnetic disk, and the second transducer is for a low-density magnetic disk. A magnetic disk drive according to claim 1.

14. The magnetic disk drive according to claim 13, wherein the first transducer is provided closer to the groove than the second transducer.

1 5. What are the above-mentioned first and second transducers? 14. The magnetic disk drive according to claim 13, wherein the magnetic disk drive is provided at a substantially central portion of the magnetic disk facing surface in the disk scanning direction.

16. The magnetic disk device according to claim 10, wherein the second region is constituted by a surface of a sphere having a predetermined radius.

17. The magnetic disk drive according to claim 16, wherein the second region is constituted by a surface of a sphere having a radius of 10 O mm or more.

18. The magnetic disk drive according to claim 10, wherein the transducing means is provided at a substantially central portion in the disk scanning direction of the magnetic disk facing surface.

19. The magnetic disk drive according to claim 10, wherein said transducing means comprises a first transducer and a second transducer.

20. The method according to claim 19, wherein the first transducer is for a high-density magnetic disk, and the second transducer is for a low-density magnetic disk. The magnetic disk device as described.

2 1. A detecting means for detecting whether the magnetic disk is a low-density magnetic disk or a high-density magnetic disk,

When the detecting means detects that the magnetic disk is the low-density magnetic disk, the rotating means rotates the magnetic disk at a relatively low speed so that the magnetic head faces the magnetic disk facing the magnetic disk. With the magnetic disk in contact with the second transformer Record or reproduce information on or from the magnetic disk with a duza,

When the detecting means detects that the magnetic disk is the high-density magnetic disk, the rotating means rotates the magnetic disk at a relatively high speed so that the magnetic head can be moved relative to the magnetic disk. 20. The magnetic recording medium according to claim 20, further comprising: control means for causing said first transducer to record or reproduce information on said magnetic disk in a state where said magnetic disk is floating. Disk device.

22. The transducing means is arranged so as to face the first signal recording surface of the magnetic disk and to the other signal recording surface of the magnetic disk. 10. The magnetic disk drive according to claim 10, further comprising a second transducing means.