JP2000195001A - Magnetic recording and reproduction apparatus utilizing flexible magnetic disk and multilayered flexible magnetic disk recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a large-capacity data storage apparatus using magnetic heads of the minimum size by realizing recording and reproducing of an arbitrary magnetic disk among a plurality of disks with employing a pair of support arms having magnetic heads which are allowed to be inserted between the pair of support arms when the magnetic heads are disengaged from a magnetic disk so that a pair of the magnetic heads are separated from each other. SOLUTION: When a disk-change command arrives, suspension arms 11A, 11B rotates to disengage head sliders 12A, 12B from a disk 4. The suspension arms 11A, 11B and the like are then driven in the vertical direction by a predetermined amount, and further allowed to rotate in the reverse direction so that the head sliders 12A, 12B are pressed against the disk 4. Thereafter, reference signals are reproduced from both surfaces of the disk 4. When reproduced output levels of the signals from a pair of the magnetic heads respectively exceed a predefined reference signal, predetermined recording and reproduction are performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus using a flexible magnetic disk and a multi-layer flexible magnetic disk recording medium, and more particularly, to a JPEG, MPEG, DV signal or the like which does not require a high data transfer rate. Multilayer flexible magnetic disk recording medium comprising a plurality of floppy disks (flexible magnetic disks) arranged in the direction of its rotation axis, which is suitable for use as a file device (data storage device) for still images and moving images, and The present invention relates to a magnetic recording / reproducing apparatus which uses a large-capacity, low-cost and random access.

[0002]

2. Description of the Related Art At present, hard disk drives (hereinafter referred to as HDDs) are widely used as storage devices for storing data such as personal computers and workstations. In addition, with the increase in the amount of data handled in recent years, H
The capacity of the DD is increasing year by year, and a high transfer rate is required along with a high-speed access. As is well known, an HDD is configured by laminating a plurality of disks made of a hard material in order to realize a large capacity, and each disk surface is provided with a dedicated magnetic head. The reason for providing a dedicated magnetic head on each disk surface in this way is to secure a strict head flying height extremely small and stable, and the movement of the magnetic head moves the ultra-smooth surface of the aluminum substrate or glass substrate, It is limited to movement that moves in a plane. By the way, in the HDD, if dust adheres to the disk surface, the dust may enter a minute gap between the disk and the head, and a head crash may occur. It is necessary to exclude the device. For example, Japanese Patent Publication No. 2780176 describes a head structure capable of securing a strict head flying height in order to secure a reliability margin for external dust of an HDD.

[0003]

In the above-mentioned HDD, in addition to the fact that the disk medium itself is expensive in terms of securing accuracy, a dedicated magnetic head is provided on each disk surface in order to strictly control the flying height. Need. For this reason, HDDs have realized a large capacity and a high transfer rate, but on the other hand, they have a high price, and there is a possibility that data may be destroyed by external dust. There is a problem that the flying height between the head and the disk varies due to the vibration transmitted from the head, and a head crash may occur.

On the other hand, as a large-capacity data file device, there is a magnetic recording device using a tape medium in addition to the HDD. A magnetic recording device using this tape medium has a low media price per unit information amount and high reliability, but on the other hand, random access cannot be performed, and data access speed is slower than a disk device. There is such a problem.

[0005] By the way, in the future, moving to digital broadcasting,
If this becomes widespread, it is considered that a high-capacity storage, an apparatus that is agile to file search and access, that is inexpensive, and that has high reliability against dust are required. As one example, it is considered that it is necessary to realize a hybrid recording / reproducing device that uses a disk device for searching a file and uses a tape device for a large-capacity file.

[0006] The present invention has been made in view of the above points,
Its purpose is to provide a magnetic recording / reproducing apparatus which is suitable for use mainly as a home storage / reproducing apparatus, has a large capacity, is excellent in data file management and accessibility, and is capable of significantly reducing costs. , And a magnetic disk recording medium used for the same. further,
An object of the present invention is to provide a magnetic recording / reproducing apparatus which has high reliability against dust.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a pair of support arms made of an elastic material, and a pair of support arms attached to a lower end and an upper end, respectively. A pair of magnetic heads, disk rotation driving means for rotatingly driving a flexible magnetic disk sandwiched between the pair of magnetic heads, and the pair of supporters in a direction in which the magnetic head crosses tracks of the flexible magnetic disk. In a magnetic recording / reproducing apparatus using a flexible magnetic disk having an arm horizontal driving means for driving an arm, a plurality of flexible magnetic disks are arranged at predetermined intervals in the direction of the rotation axis thereof, and Arm vertical drive means for driving the arm up and down along the rotation axis direction of the flexible magnetic disk; A head vertical position detecting means for detecting a vertical position of the head (a position along a rotation axis direction of the flexible magnetic disk); and the pair of support arms being horizontally driven by the arm horizontal driving means, and A separator means for entering the space between the pair of support arms and separating the pair of magnetic heads when the space is separated from the flexible magnetic disk, and the pair of support arms having the magnetic head, An arbitrary one of the plurality of flexible magnetic disks is configured to be recordable / reproducible.

Further, in order to achieve the above object, the present invention provides a multi-layer flexible magnetic disk recording medium comprising a plurality of flexible magnetic disks mounted on a same rotating shaft at predetermined intervals. Recording and reproduction can be performed while being sandwiched between a pair of magnetic heads attached to the tips of a pair of support arms, respectively, and both sides of each of the flexible magnetic disks are covered by the pair of magnetic heads. Are simultaneously written, a reference signal for comparing the respective playback output levels is written in advance.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 9 relate to a magnetic recording / reproducing apparatus according to a first embodiment of the present invention. FIG. 1 is a partial side view of a main part of the magnetic recording / reproducing apparatus, and FIG. 2 is a plan view of a main part of the magnetic recording / reproducing apparatus. FIG. 3 is a perspective view showing the upper suspension arm.

1 to 3, 1 is a chassis, 2 is a spindle motor mounted on the chassis 1, 3 is
A rotating shaft that is rotationally driven by the spindle motor 2 (here, a rotating shaft integrally attached to the output shaft of the spindle motor 2, but may be the output shaft of the spindle motor 2 itself). A plurality (four in this case) of flexible magnetic disks (floppy disks; hereinafter referred to as “floppy disks”) attached so as to rotate integrally with the shaft
Numeral 5 is inserted into the rotary shaft 3, spacers for positioning each disk 4 at a predetermined height, and 6 are fastened to the rotary shaft 3, and each disk 4 is connected to the rotary shaft 3. It is a fixing member for integrating with.

Reference numeral 7 denotes a fixed shaft that is erected and fixed to the chassis 1. Reference numeral 8 denotes a support base member that is inserted into the fixed shaft 7 so as to be movable up and down. The ball bearing 10, which is inserted as possible and whose inner ring is fixed to the support base member 8, is integrated with the outer ring of the ball bearing 9, is rotatable about the fixed shaft 7, and Arm support member that can move up and down along
1A and 11B are a pair of suspension arms (support arms) made of an elastic material whose base ends are fixed to the arm support member 10, and 12A and 12B are lower and upper ends of the pair of support arms 11A and 11B. A pair of magnetic heads are provided on the head sliders 12A and 12B, respectively.

Reference numeral 13 denotes a magnetic yoke attached to the support base member 8, reference numeral 14 denotes a magnet attached to the magnetic yoke 13, and reference numeral 15 denotes an arm support member 10 facing the magnet 14 with a predetermined gap. The attached coil 16 is a separator attached to the support base member 8 so as to be located near the outer periphery of the disk 4 and at an intermediate height between the pair of support arms 11A and 11B ( (Fig. 2).

Reference numeral 17 denotes a motor holder attached to the chassis 1, 18 denotes a motor (FIG. 2) attached to the motor holder, 19 denotes a driving gear fixed to an output shaft of the motor 18, and 20 denotes a driving gear 19. Meshing relay gear, 2
1 is provided integrally with the support base member 8,
It is a rack that meshes with 0.

In FIG. 2, reference numeral 22 denotes a scale, 2
3 is a supporting base member 8 facing the scale 22.
The scale 22 and the scale detecting means 23 allow the scale 22 and the scale detecting means 23 to move the support base member 8 in a vertical position (a height direction position along the rotation axis 3), that is, a magnetic field attached to the suspension arm. Head vertical position detecting means for detecting the vertical position (height position) of the head is configured.

[0015] As shown in FIG. 1, each disc 4 is disposed at equal intervals in the axial direction of the rotating shaft 3 at a predetermined pitch P _C, the height direction position at the bottom of the disk 4, and each The spacing between the disks 4 is precisely defined by the spacers 5. All the disks 4 are integrally rotated by the rotation of the spindle motor 2.

The base ends of the suspension arms 11A and 11B made of an elastic metal thin plate or the like are
0, a head slider 12A attached to the lower end of the upper suspension arm 11A and a head slider 12B attached to the upper end of the lower suspension arm 11B.
The suspension arms 11A and 11B are urged in a direction in which they are in close contact with each other by the elastic force. FIG. 3 shows the upper suspension arm 11A and the head slider 12
A is a perspective view showing a pair of head sliders 12A,
When the disk 4 is sandwiched by the disks 12B, the magnetic head provided on the head slider 12A (and the head slider 12B) is pressed against the disk 4 with a predetermined pressure. In FIG. 3, reference numeral 24 denotes a signal line connected to the magnetic head, and an arrow C indicates the rotation direction of the disk 4.

FIG. 4 shows the head slider 12A (or 1).
FIG. 2B) is a view showing the disk sliding surface side, and as shown in the figure, a magnetic head 25 is mounted on the disk sliding surface side of the head slider. The magnetic gaps 25a of the magnetic heads 25 of the paired head sliders 12A and 12B face each other at substantially the same position on the front and back of the disk 4.

The above-described magnetic yoke 13 and magnet 1
4. The coil 15 serves as a horizontal movement driving means (that is, an arm horizontal driving means) for driving the arm support member 10 and the suspension arms 11A and 11B to rotate in the horizontal direction, and is opposed to the fixed magnet 14. By passing a predetermined drive current through the coil 15 thus completed, the arm support member 10 (suspension arms 11A, 11B)
Rotate in the direction of arrow A or B in FIG. Then, by this, the head slider 12A,
Each of the 12B magnetic heads 25 is transported in a direction crossing tracks on the disk 4 (substantially in the disk radial direction) and positioned at a desired track position.

The suspension arms 11A, 11A
B in the direction of arrow B, and as shown in FIG. 5, the head sliders 12 of the suspension arms 11A and 11B are rotated.
When A and 12B are rotated to positions off the disk surface, the wedge portion 16a at the tip of the separator 16 located in the vicinity of the outer periphery of the disk 4 (see the enlarged view of the main part of the separator 16 in FIG. 6) is moved to the suspension arm. 11A,
11B, the head sliders 12A, 12B are forcibly separated from each other against the elasticity of the suspension arms 11A, 11B. When the wedge portion 16a is completely inserted between the suspension arms 11A and 11B, the disk 4 does not overlap the suspension arms 11A and 11B and the head sliders 12A and 12B in a planar manner. .

It is needless to say that the above-mentioned horizontal movement driving means (arm horizontal driving means) may have a configuration using a motor as a driving source.

The motor 18, the driving gear 19, the relay gear 20, and the rack 21 drive the supporting base member 8 and the members on the supporting base member 8 in the vertical direction (up and down in parallel with the rotating shaft 3 and the fixed shaft 7). Drive) (vertical drive means), that is, arm vertical drive means, and by rotating the motor 18 in a predetermined direction,
Support base member 8 and members on support base member 8 (suspension arms 11A, 11B, separator 16, etc.)
Is transported in the direction of arrow D or E in FIG.

Here, in order to control the amount of vertical movement by the above-mentioned arm vertical driving means, the above-described head vertical position detecting means comprising the scale 22 and the scale detecting means 23 is provided. , The absolute height of the intermediate position between the paired magnetic heads 25, 25 can be detected. The scale 22 may be a magnetic type or an optical fringe. In this case, the scale detection unit 23 employs a magnetic detection unit such as a Hall element or an optical detection unit. Note that the head vertical position detecting means may employ an encoder for detecting the rotation of the motor 18.

Next, the operation of this embodiment will be described. In a state where the pair of magnetic heads 25 sandwich the disk 4 (a state where the magnetic head 25 is loaded on the surface of the disk 4), the disk 4 is rotated by the spindle motor 2 in the direction of arrow C as shown in FIG. , The suspension arms 11A, 11B
Is transferred in the direction of the arrow A or B, thereby positioning the magnetic head 25 on a desired track, and recording or reproducing from the disk 4 is performed.

When recording or reproducing another desired disk 4 from a state in which a certain disk 4 is held between a pair of magnetic heads 25, first, as shown in FIG. By driving the suspension arms 11A and 11B in the direction of arrow B by the driving means, the head sliders 12A and 1B of the suspension arms 11A and 11B are rotated.
2B is rotated to a position off the disk surface (the magnetic head 25 is rotated to a position where it is unloaded with respect to the disk 4 surface), whereby the wedge portion 16a of the separator 16 is inserted between the suspension arms 11A and 11B. As described above, the head slider 12 is opposed to the elasticity of the suspension arms 11A and 11B.
A and 12B are forcibly separated.

Next, by the arm vertical driving means,
The support base member 8 is slid upward or downward (in the direction of the arrow D or E in FIG. 1) with respect to the fixed shaft 7, whereby the intermediate position between the pair of suspension arms 11A and 11B (the pair of head sliders 12A). , 12B) is moved in the height direction until it reaches a position equal to the desired height position of the disk 4.

Subsequently, the suspension arms 11A and 11B in a state where the separator 16 is sandwiched are rotated in the direction of arrow A by the arm horizontal driving means to separate the suspension arms 11A and 11B from the separator 16, Before the sliders 12A and 12B collide with each other (before the head sliders 12A and 12B are completely closed by the elastic force of the suspension arm), the head sliders 12A and 12B are transported to a position where they overlap the desired surface of the disk 4. . When the suspension arms 11A, 11B reach a position completely separated from the separator 16, the head sliders 12A, 12B clamp the disk 4 by the elastic force of the suspension arms 11A, 11B, and the magnetic head 25 , So that the desired selected disk 4 is shifted to a recordable or playable state.

FIG. 7 shows how the magnetic head 25 transitions from the unloaded state to the loaded state. FIG. 7A is a side view of a main part corresponding to the state of FIG. 5, and FIG. 7B is a side view of a main part corresponding to the state of FIG.

In the head unloading state shown in FIG. 7A, a pair of suspension arms 11A, 1A
1B, the wedge portion 16a of the separator 16 is inserted, whereby the suspension arm 11A,
11B is elastically deformed, and the head sliders 12A, 12B
Are forcibly separated.

From this state, the suspension arm 11
When the suspension arms 11A and 11B are rotated in the direction A, the suspension arms 11A and 11B move away from the wedge portions 16a of the separator 16, and the suspension arms 11A and 11B move.
Before the head sliders 12A and 12B collide with each other due to the elastic force of 1B, the head sliders 12A and 12B hold the disk 4 and shift to the head loading state shown in FIG. 7B.

By performing such an operation, when an arbitrary disk 4 is selected, it is possible to stably shift to the head load state without collision between the head slider and the disk.

Next, a control system of the magnetic recording / reproducing apparatus of the present embodiment will be described. FIG. 8 is a diagram showing a simplified control system of the present embodiment.

In FIG. 8, reference numeral 31 denotes a system control unit for controlling the entire system, 32 denotes a recording / reproduction control circuit connected to the pair of magnetic heads 25, and 33 denotes a control of the system control unit 31. And the recording / playback control circuit 3
2 is appropriately processed to output reproduced data to an output circuit (not shown) or the like, and input data from an input circuit (not shown) is appropriately processed and recorded / reproduced as recording data. A signal processing circuit for outputting to the control circuit 32;
Compares a reproduction output level when a pair of magnetic heads 25 reproduces reference signals pre-recorded on both sides of the disk 4 with a predetermined reference value, and outputs the comparison result to the system control unit 31. This is a reproduction output comparison circuit.

Reference numeral 35 includes the above-described arm horizontal drive means, and based on a command from the system control unit 31,
A drive current is supplied to the coil 15 by a driver circuit (not shown) of the suspension arm 11A,
The first driving unit 36 for driving the first unit 1B in the horizontal direction includes the arm vertical driving unit described above, and the system control unit 31
A second drive for driving the suspension arms 11A and 11B and the separator 16 (support base member 8) in the vertical direction by supplying a drive current to the motor 18 by a driver circuit (not shown) based on a command from the Means.

The head vertical position detecting means 37 outputs information on the measured head height position to the system control unit 31. The head motor vertical position detecting unit 38 operates based on a command from the system control unit 31. Is a spindle motor control circuit that drives to rotate.

In the configuration shown in FIG. 8, when recording is performed while the pair of magnetic heads 25 is in the expected load state, the spindle motor control circuit 38 controls the spindle motor under the control of the system control unit 31. While rotating the motor 2 to rotate the disk 4 at a predetermined rotation speed,
The suspension arm 11 is driven by the first driving means 35.
The recording data processed by the signal processing circuit 33 is output to the magnetic head 25 via the recording / reproduction control circuit 32 while the A and 11B are being transported in the approximate radial direction of the disk, and the data is recorded on the surface of the disk 4. The recording / reproduction control circuit 32 includes a recording amplifier (not shown), and records data on the disk 4 with an optimum recording current. Also, 1
In the case where reproduction is performed when the paired magnetic heads 25 are in the expected load state, the disk 4 is similarly rotated at a predetermined rotational speed under the control of the system control unit 31, and
A signal picked up by the magnetic head 25 is amplified by a reproducing amplifier (not shown) of the recording / reproducing control circuit 32 while the suspension arms 11A and 11B are moved in a substantially radial direction of the disk. Process and output. When recording and reproducing data on the disk 4 as described above, writing and reading may be performed one by one, or simultaneous writing and reading may be performed on both sides.

Also, a magnetic disk 2
When performing recording or reproduction on another desired disk 4 while the disk 5 is in the load state, first, the first driving unit 35 first activates the suspension arm 11A based on a command from the system control unit 31. 11B is rotated in the direction of the arrow B, and the magnetic head 25 (the head slider 12A,
12B) is moved to the unload position, and the wedge portion 16a of the separator 16 is inserted between the suspension arms 11A and 11B, so that the head slider 12
A and 12B are forcibly separated.

Next, based on a command from the system control section 31, the second drive means 36 is driven by the support base member 8 described above.
Then, the members (suspension arms 11A, 11B, separator 16, arm horizontal driving means) on the support base member 8 are driven in the vertical direction to
The intermediate position between 1A and 11B is positioned at the desired height position of the disk 4. At this time, the system control unit 31 recognizes the position of the support base member 8 based on the detection result of the head vertical position detection means 37 and moves the support base member 8 in the vertical direction to the command value.

Subsequently, based on a command from the system control unit 31, the first driving means 35
By rotating the suspension arms 11A and 11B from the separator 16, the head sliders 12A and 12B (1
The paired magnetic heads 25) shift to a head load state in which the desired disk 4 is sandwiched.

In this initial head load state, the system control unit 31 gives a command to each unit and
Are controlled so as to reproduce reference signals pre-recorded at predetermined positions on both sides of the reference signal. After the signals picked up by the pair of magnetic heads 25 are processed by the recording / reproduction control circuit 32, the reproduction output comparison circuit 34 sets the reproduction output level of the signal from each magnetic head 25 to a preset value. It is determined whether or not the reference level (target level) has been exceeded.
1 is output. If the reproduction output level of one of the magnetic heads 25 does not reach the reference level based on the determination result, the system control unit 31 moves the second drive unit in a direction in which the reproduction output level reaches the reference level. 3
6 is finely adjusted so that the height position of the pair of magnetic heads 25 is finely adjusted so that the height positions of the head sliders 12A and 12B (the pair of magnetic heads 25) are at appropriate positions. As a result, it is possible to obtain a desired head load state in which the reproduction output levels of the pair of magnetic heads 25 both exceed the reference level.

As described above, the reason why the height position of the magnetic head 25 is finely adjusted based on the output of the reproduction output comparison circuit 34 is that a stable head contact can be obtained only by the detection accuracy of the head vertical direction detecting means 37. This is because it is difficult to secure the magnetic head, and if an excessive pressure force is applied to the single-sided magnetic head, there is a possibility that the reliability may be deteriorated such as a scratch on the disk surface. The fine adjustment of the height position of the magnetic head 25 is performed at the time of initial head loading, but may be performed at an appropriate timing during recording / reproducing as needed.

FIG. 9 is a diagram showing a processing flow of the above-described disk change operation. When a disc change command arrives, in step ST1, the suspension arm 1
1A and 11B are rotated in the direction B, and the head sliders 12A and 12B (magnetic head 25) are
, And in the next step ST2, the suspension arms 11A, 11B, etc. are driven by a predetermined amount in the vertical direction,
In the next step ST3, the suspension arm 11A,
The head sliders 12A and 12B (magnetic head 25) are pressed against the disk 4 by rotating the head 11B in the direction A described above. Subsequently, in step ST4, the disk 4
The reference signal is reproduced from both sides, and in the next step ST5, it is determined whether or not the reproduction output level of the signal from the pair of magnetic heads 25 exceeds a preset reference level (target level). I do. If NO in step ST5, fine adjustment of the vertical position of the suspension arms 11A and 11B (magnetic head 25) is performed in step ST6, and the process returns to step ST5. If YES in step ST5, the process proceeds to step ST7 to perform recording.・ Perform playback.

As described above, according to the present embodiment, a low-priced, large-capacity data storage can be realized with an inexpensive disk and a minimum number of magnetic heads. Further, even if the height of the magnetic head is variable, a stable contact between the head and the disk can be obtained.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 10 shows a second embodiment of the present invention.
FIG. 11 is a side view showing a configuration of a main part of a magnetic recording / reproducing apparatus according to an embodiment. FIG. 11 is a multilayer disk apparatus (multi-layer flexible magnetic disk recording medium) used in a magnetic recording / reproducing apparatus according to a second embodiment of the present invention. Vertical direction (height direction)
It is a figure which shows the dimensional relationship of.

This embodiment is different from the first embodiment in that, as shown in FIG.
Head sliders 12A, 12A at the tips of A, 11B
On the side opposite to the mounting surface of B, a cleaning member 40A,
40B and the interval between the disks 4 are set to predetermined values, and the other points are the same as those of the first embodiment.

In this embodiment, when the pair of magnetic heads 25 sandwich the disk 4, the cleaning members 40A and 40B are separated from the adjacent upper or lower disk, and the pair of magnetic heads 25 are separated from each other. Suspension arm 11A,
When 11B is located between two adjacent disks 4, 4, the cleaning members 40A, 40B set the distance between the disks 4 so as to abut against the two disks 4 with a predetermined pressing force. I have. Therefore, as shown in FIG. 10, in a state where the pair of suspension arms 11A and 11B are located between two adjacent disks 4, 4,
While rotating the disk 4, the cleaning member 40A,
By transporting the 40B substantially in the radial direction of the disc, it becomes possible to remove and / or adsorb foreign substances such as magnetic powder and dust, which cause dropout and adhere to the disc surface. The cleaning may be performed when an error is large at the time of reproduction, or may be performed periodically before data recording.

[0046] In FIG. _{11, X 1, X 2,} X 3 is a reference value S ₀ when the S ₀ = 0, from the reference value S _0,
An intermediate height position between the disks is shown, and at the time of disk cleaning, the intermediate position of the pair of magnetic heads 25 is located at one of X ₁ , X ₂ , and X ₃ . Also, L
₀ , L ₁ , L ₂ , and L ₃ indicate the height positions of the respective disks from the reference value S ₀ , and the plurality of disks 4 are arranged at equal intervals from the reference value S ₀ with a pitch L _0. ing.
At the time of data recording / reproducing, the intermediate position of the pair of magnetic heads 25 is at the same height as L ₀ , L ₁ , L ₂ , L ₃ , but in the cleaning mode, X ₁ , X ₂ , X ₃ Set to the height position.

According to the present embodiment, in addition to the effects of the first embodiment, the magnetic recording / reproducing apparatus itself can
Since the disk cleaning is performed, reliability against dust can be improved.

[0048]

As described above, according to the present invention,
A low-cost, high-capacity data storage device that can be built with inexpensive disks and a minimum number of magnetic heads, and
A recording medium used for this can be realized. Further, even if the head height is variable, a stable contact between the head and the disk can be obtained. Further, since the apparatus itself performs the disk cleaning, it is possible to realize a highly reliable apparatus that is resistant to dust entering from the outside.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, which is partially cut off in a head loaded state.

FIG. 2 is a main part plan view of a magnetic recording and reproducing apparatus according to an embodiment of the present invention in a head loaded state.

FIG. 3 is a perspective view showing an upper suspension arm in the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 4 is a plan view showing a disk sliding surface side of a head slider in a magnetic recording and reproducing apparatus according to an embodiment of the present invention.

FIG. 5 is a main part plan view of a magnetic recording / reproducing apparatus according to one embodiment of the present invention in a head unloaded state.

FIG. 6 is a perspective view showing a separator in the magnetic recording and reproducing apparatus according to one embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a state in which a head shifts from an unload state to a load state in the magnetic recording and reproducing apparatus according to one embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a control system in the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 9 is a flowchart showing an operation processing flow of disc change in the magnetic recording and reproducing apparatus according to the embodiment of the present invention.

FIG. 10 is a side view of a main part of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention at the time of disk cleaning.

FIG. 11 is an explanatory diagram showing a dimensional relationship in a vertical direction (height direction) of a multilayer disk device (multilayer flexible magnetic disk recording medium) used in a magnetic recording / reproducing device according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chassis 2 Spindle motor 3 Rotating shaft 4 Disk (flexible magnetic disk) 5 Spacer 6 Fixed member 7 Fixed shaft 8 Support base member 9 Ball bearing 10 Arm support member 11A, 11B Suspension arms 12A, 12B Head slider 13 Magnetic yoke 14 Magnet 15 Coil 16 Separator 16a Wedge 17 Motor holder 18 Motor 19 Drive gear 20 Relay gear 21 Rack 22 Scale 23 Scale detecting means 24 Signal line 25 Magnetic head 25a Magnetic gap 31 System control unit 32 Recording / reproduction control circuit 33 Signal processing circuit 34 Reproduction Output comparing circuit 35 First driving means 36 Second driving means 37 Head vertical position detecting means 38 Spindle motor control circuit 40A, 40B Cleaning member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Maruyama 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Multimedia Systems Development Division of Hitachi, Ltd. (72) Inventor Hidekazu Takeda Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa No.292 Multimedia System Development Division, Hitachi, Ltd. (72) Nobuhiro Umebayashi 1-88 Ushitora, Ibaraki-shi, Osaka, Japan Inside Hitachi Maxell Co., Ltd. (72) Teruhisa Miyata Ushitoraichi, Ibaraki-shi, Osaka 1-88 F-term in Hitachi Maxell, Ltd. (Reference) 5D091 AA09 CC04 GG15 GG27 HH04

Claims (5)

[Claims] 1. A pair of support arms made of an elastic material, a pair of magnetic heads respectively attached to a lower end and an upper end of the pair of support arms, and sandwiched between the pair of magnetic heads. Magnetic recording and reproducing apparatus comprising: a disk rotation driving means for driving a flexible magnetic disk to be rotated; and an arm horizontal driving means for driving the pair of support arms in a direction in which the magnetic head crosses tracks of the flexible magnetic disk. An arm vertical drive for arranging a plurality of the flexible magnetic disks at predetermined intervals in a rotation axis direction of the flexible magnetic disks and driving the pair of support arms up and down along the rotation axis direction of the flexible magnetic disks; Means for detecting a vertical position of the magnetic head (a position along a rotation axis direction of the flexible magnetic disk) When the pair of support arms are horizontally driven by the head vertical position detecting means and the arm horizontal drive means, and the magnetic head is separated from the flexible magnetic disk, the magnetic head enters between the pair of support arms. And a separator means for separating the pair of magnetic heads. The pair of support arms having the magnetic heads provide:
A magnetic recording and reproducing apparatus using a flexible magnetic disk, wherein any one of the plurality of flexible magnetic disks can be recorded and reproduced. 2. The reproduction output comparison according to claim 1, wherein the reference signals recorded on both sides of the flexible magnetic disk are reproduced at the same time by the pair of magnetic heads. The system control means of the magnetic recording / reproducing apparatus drives the arm vertical drive means as necessary so that the read output levels of the pair of magnetic heads each exceed a predetermined value, and A magnetic recording / reproducing apparatus using a flexible magnetic disk, wherein a vertical position of a support arm is finely adjusted. 3. The flexible magnetic disk according to claim 2, wherein the comparison processing by the reproduction output comparison means is performed when at least the pair of magnetic heads transitions from an unload state to a load state. Magnetic recording / reproducing device using a. 4. The magnetic disk according to claim 1, wherein a cleaning member is disposed at a tip of each of the pair of support arms on a side opposite to a mounting surface of the magnetic head, and the pair of magnetic heads holds the flexible magnetic disk. When the cleaning member is separated from the other flexible magnetic disk, and when the pair of support arms is positioned between two adjacent flexible magnetic disks, the cleaning member is This 2
A magnetic recording / reproducing apparatus using a flexible magnetic disk, wherein the magnetic recording / reproducing apparatus is configured to contact the flexible magnetic disks. 5. A multi-layer flexible magnetic disk recording medium comprising a plurality of flexible magnetic disks mounted on a same rotating shaft at predetermined intervals, wherein the flexible magnetic disk is provided at a tip of a pair of support arms. Recording and reproduction can be performed while being sandwiched between a pair of magnetic heads attached to the respective magnetic heads. When both surfaces of each of the flexible magnetic disks are simultaneously reproduced by the pair of magnetic heads, A multi-layer flexible magnetic disk recording medium, wherein reference signals for comparing reproduction output levels are written in advance.