JPH0440668A - Disk device - Google Patents

Abstract

PURPOSE:To stably maintain contact between a magnetic head and a recording medium by generating an air flow between the medium and a medium sucking device and sucking the medium to stationalize its vibration. CONSTITUTION:When a disk motor 24 is rotated, a flexible disk (FD) 20 directly connected to the motor 24 is rotated in the clockwise direction and its peripheral air flows in the circumferential direction of the FD 20 due to its viscosity. At this time, a part of air flowing along the FD 20 is interrupted by the edges of the medium sucking device 33 arranged in the vicinity of the FD 20 and the sectional area of a passage is increased by the taper faces 34, 35 formed on both the sides of the device 33, so that air density is reduced. Thereby, the FD 20 is attracted to the device 33 side and can be contacted with the exposed magnetic gap of the magnetic head, or allowed to be close to the gap by the submicron order. Consequently, relative positional accuracy between the flexible recording medium and the medium sucking device is highly accurately maintained at the time of rotating the recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a storage device, particularly a disk device using a flexible disk (hereinafter referred to as FD).

[Prior Art] As is well known, magnetic disk devices have evolved as external storage devices for large computers, and now a single device can store 1 gigabyte of information. The need for increased storage capacity is expected to continue to increase as computers evolve. In order to achieve this increase in capacity, it is necessary to increase the linear recording density and trunk density by using high-performance magnetic media and high-performance magnetic heads. In order to increase the linear recording density, it is necessary to ensure sufficient adhesion between the medium and the head.

When a minute gap exists between the magnetic head and the medium, that is, the magnetic disk, the reproduction output of the magnetic head is significantly attenuated by this gap, and this attenuation is expressed by the following equation (1).

Ls=- to -d/λ(dB) (
1) (However, Ls is the amount of attenuation of the reproduction output, K is a constant, d is a minute gap, and λ is the information (signal) recorded on the disc.
For example, 20KF in a fixed magnetic disk drive.

In order to ensure the linear recording density of C and I, the gap between the head and the disk is set to 0.4 μm or less. In order to increase this linear recording density to 50 KF, C, I, which is more than double the conventional level, the above-mentioned gap should be reduced to 0.1 in order to avoid the large attenuation of the reproduction output.
Must be less than μ.

On the other hand, in a magnetic disk drive, when the head is brought into close contact with the disk at a submicron size or less and the disk is rotated at high speed, the greatest concern is wear and mechanical damage between the head and the disk, and the loss of stored information. It is.

In the fixed magnetic disk drive described above, this mechanical damage is avoided by lubrication using an air film formed between the head and the disk. However, when the gap is less than 0.1 μm, it is difficult to avoid this damage only by this air film lubrication. When it becomes 0.1μ or less, minute protrusions existing on the magnetic disk and CS S (conta
ct 5 tart 5 top), the probability that the head will come into direct contact with the disk increases. Fixed disks have rigid bases, so when the head comes into contact with them, a large concentrated impact force is generated, resulting in fatal destruction. In other words, in a fixed magnetic disk device using a rigid substrate, it is impossible to increase the linear recording density and storage capacity beyond the current level.

In order to solve this problem, what is shown in US Pat. No. 4,743,989 is known.

8 to 14 show a magnetic disk device shown in US Pat. No. 4,743,989. In Figure 8.9.10, (1) (2) is an FD with a magnetic layer formed on the surface of a film such as PET, (3) is a hub, and (4) is a spacer. ) is fixed to the hub (3) with a spacer (4) interposed therebetween. Also, (5) is F D
This is a hole drilled on the same circumference as (1). (6) is the top cartridge, and (7) is the flat Bernoulli surface provided on the top cartridge. (8) is the opening opened in the radial direction of the FD, (9) is the bottom cartridge, (10)
is a dish-shaped hole provided in the center of the bottom cartridge (9). (11) is the opening (8) of the top cartridge (7).
), the same opening (12) in Fig. 11 is a spring, which can be housed in the hole (10).

F D (1) (2), top cartridge (6) and bottom cartridge (9) together with cartridge (1)
3). In Figure 12.13 (14) (
15) is a magnetic head for recording and reproducing magnetic signals on the FD (1) (2), and is fixed to the arms (16) (17).

When the cartridge (13) is loaded into the magnetic disk drive, the hub (3) engages with the motor shaft (18). Further, the hub (3) is pressed against the motor shaft (18) by a spring (12) in the cartridge, so that the driving force of the motor can be transmitted to F D (1) (2).

On the other hand, the magnetic heads (14) (15) pass through the openings (8) (11) provided in the top cartridge (6) and the bottom cartridge (9), respectively.
Close to 2).

When current is applied to the drive motor in this state, F D (1)
(2) rotates at high speed, and a centrifugal force acts on the air interposed between the Bernoulli surface (7) of the top cartridge (6) and the FD (2), and as shown in Figure 13.14, the FD (2) rotates in the radial direction of the FD. A flow occurs. And Bernoulli surface (7) and F
When F D (2) is in close contact with F D (2), this air flow generates pressure (positive pressure) that separates F D (2) from the Bernoulli surface (7). On the other hand, the Bernoulli surface (7
) and F.D. Attracted to Bernoulli surface (7). In other words, the air flow developed between the FD (2) and the Bernoulli surface (7) has the effect of keeping the gap between the FD and the Bernoulli surface constant (commonly known as the Bernoulli effect). FD
Centrifugal force acts on the air existing between (1) and (2) in the same way as above, and the air flows in the radial direction of the FD through the round hole (5) made in the FD (1), resulting in the Bernoulli effect. appear. Therefore, FD (1) (2) maintains a constant distance from the Bernoulli surface (7) due to the Bernoulli effect, that is, FD (1) (2) can rotate with extremely small vibrations. . Further, at this time, due to the pressure generated by this air flow, F D (1) (2) repel each other and come into contact with the magnetic heads (14) (15). In this way, in the magnetic disk drive disclosed in U.S. Pat. Sandwich the two FDs,
Moreover, the centrifugal force generated by the rotation forms an air flow to bring each of the two FDs into stable contact with the two magnetic heads. Therefore, even if there are minute protrusions and wear particles on the FD, the flexibility of the FD will prevent the F.
By using a highly flexible FD in which D is displaced and no large impact force is generated, it is possible to avoid catastrophic destruction that occurs in fixed magnetic disk drives. In other words, it is possible to easily increase the linear recording density and construct a large-capacity magnetic storage device.

[Problems to be Solved by the Invention] However, the magnetic disk drive disclosed in US Pat. No. 4,743,989 employs an FD in order to reduce the impact force upon contact with a magnetic head. Further, the structure is such that vibrations generated when the FD rotates are statically fixed by a Bernoulli surface provided on the cartridge, and recording and reproduction is performed on the FD using a magnetic head supported by a member outside the cartridge. Therefore, F D (1
) The height of (2) is determined by this Bernoulli surface,
On the other hand, near the head, the height of the FD is regulated by the magnetic heads (14) and (15). For this reason, the magnetic head (
14) If the heights of Os) and Bernoulli surface (7) do not match, F D (1) (2) will come into excessively deep contact with one of the opposing magnetic heads (14) and (15), and the other will come into extremely deep contact. This will be a shallow contact. (See FIG. 15) In the case of deep contact, the FD contacts the peripheral edge of the magnetic head, and the gap between the FD and the magnetic gap located at the center of the magnetic head becomes large.

If the contact occurs at the peripheral edge of the magnetic head, the contact pressure will be extremely high and will damage the magnetic head and the FD. If the gap with the magnetic gap is large, the output will be drastically reduced. On the other hand, in the case of shallow contact, the contact pressure between the magnetic head and the FD becomes small, and the contact between the magnetic gap and the FD becomes unstable.

In other words, F whose vibration is statically determined by the Bernoulli surface
In order to bring the magnetic head into stable contact with the FD and prevent damage to the FD and the magnetic head, the height between the cartridge (13) and the magnetic head (14) (15) must be maintained with high precision. . To achieve this, it is necessary to increase the rigidity of the base, arm, and seek drive device of the magnetic disk drive, and to make highly accurate adjustments.
This was an obstacle to weight reduction.

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a large-capacity disk device that is small, lightweight, reduces the impact force upon contact, and ensures high reliability.

[Means for Solving the Problems] In a disk device according to a first aspect of the present invention, a medium suction device having an integral magnetic head is used for a flexible magnetic recording medium.

Further, the disk device according to the second invention uses a flexible optical recording medium, uses a laser light source and a photoelectric detector for reflected light, and uses a similar medium suction device.

[Work] By the configurations of these first and second inventions.

When the flexible recording medium is rotating, an air flow is generated between the recording medium and the medium suction device, and this flow attracts the recording medium and stabilizes its vibrations, causing the magnetic head to and maintain stable contact with the medium.

[Example] An example of the first invention of the present invention will be described below with reference to FIGS. 1 to 4.
This will be explained using figures.

In other words, in Fig. 1 (a) and (b), (20) is the FD on which magnetic information is written, (21) is a spacer, and with this spacer in between, the two FDs (20) are connected to the upper flange ( 22) and a lower flange (23). (24) is a disk motor that rotates the F D (20) clockwise, and the base (
25). In addition, the lower flange (
23) is mechanically coupled to the shaft (24a) of the disc motor. (26) is the swing arm, (2
6a) is a hole provided at one end of the swing arm.

(27) is a shaft supported by a bearing (28) such as a ball bearing attached to the base (25), and its rotation axis is fixed to the base (25) parallel to the rotation axis of the disc motor (24). There is. The hole (26a) of the swing arm is connected to the shaft (27).

The swing arm (26) is thereby connected to the shaft (2
7) can be rotated around. (29) is the base (25
) stepper motor attached to. (30) is a sleeve and the shaft of the stepping motor (29) (
29a). (31) is an L-shaped leaf spring, one end of which is fixed to the swing arm (26). (32) is a steel belt with a sleeve (3
0) two to three times, one end of which is a leaf spring (31),
The other end is fixed to the swing arm (26) and tensioned by a leaf spring (31). Therefore, rotation of the stepping motor (29) is converted into rotation of the swing arm (26) by friction between the sleeve (30) and the steel belt (32). Furthermore, (33) is an arm-shaped medium suction device of the present invention having the same thickness as the spacer (21), and is arranged parallel to the rotation plane of the disk motor (24) and between these two FDs, and its longitudinal direction is The direction is toward the center of rotation of F D (20). Moreover, one end of this is fixed to a block (26b) connected to the swing arm (26).

Next, the operation of the magnetic disk device configured as described above will be explained.

When the disk motor (24) is energized and rotated, the F D (20) directly connected thereto rotates clockwise.

When the FD rotates, the surrounding air flows along the FD in its circumferential direction due to its viscosity. As shown in FIG. 5, at this time, the medium suction device (33) near the F D (20)
This is the part of the air that flowed along the FD! (
It is partially blocked by the edge of 33).

In addition, tapered surfaces (
34) Due to (35), the cross-sectional area of the flow path increases, so the density of the air becomes thinner, resulting in a pressure lower than the external atmospheric pressure Pa (
negative pressure). For this reason, FD (20) is a media suction device! ! (33) side, and its tapered surface (3
4) It can be brought into contact with the magnetic gap (38) of the magnetic head (36) provided in an exposed state at (35) or brought close to it on the order of submicrons. The attraction force that attracts the FD to the tapered surface depends on the inclination angle θ of the tapered surfaces (34) and (35), as shown in Figure 2 (c), 6θ = 0.
In the case of θ, no suction force is generated; as θ increases, the suction force increases, but if it becomes too large, the suction force will decrease. For example, when θ=90 degrees, the suction force is approximately equal to zero. According to experimental results, approximately 5 degrees was optimal. Furthermore, in FIG. 2 which is a detailed view of the medium suction device (33), (34) and (35) are formed on both the front and back sides of the device at an angle θ with respect to the rotation plane of the disk motor (24). The tapered surface (36) is a magnetic head that converts electrical signals into magnetic information and records and reproduces it on the FD (20). ing. Figure 4 (a) (b)
(c) is a detailed diagram of this magnetic head, (37) is a core made of ferrite or the like with high magnetic permeability, and (38) is a magnetic gap with high magnetic resistance provided between these cores. (39) is a coil wound around one side of the core. (40) is the magnetic gap (3
A ceramic plate made of barium titanate, which is a non-magnetic material and has high hardness, is bonded to the back surface of the core (37) facing the core (37).

FIGS. 3(a), 3(b), and 3(c) are detailed views of the main body arm (33a) before the magnetic head (36) is attached,
(41) is a main body plate made of non-magnetic stainless steel.

(42) is a barium titanate ceramic plate pasted on both sides, and these constitute the main body arm (33a). (43) is 2 that penetrates from the front to the back of the main body arm.
Open d part. (44) (45) is the side of the main body arm (
46) is an opening provided perpendicularly to the opening (43). The magnetic head (36) includes a coil (39).
) and the openings (44) and (45) are engaged with each other, and one is inserted into the opening (43) so that the magnetic gap (38) is exposed, and the other is exposed to the ceramic plate (40). Insert and secure with adhesive. Then the tapered surface (34)
(35) is processed using a processing machine such as a surface grinder, and the magnetic gap (38) of the magnetic head, the front and back surfaces with the ceramic plate (40), and each tapered surface (34) are processed.
(35) with high accuracy. When assembled as shown in Fig. 2 and in the state shown in Fig. 1, when an electric signal is passed through the coil (39) of the magnetic head, the corresponding leakage magnetic flux is caused by the magnetic gap (
38), and information is recorded in the magnetic layer of F D (20). Regeneration goes through the reverse process and the coil (3
9) An electrical signal is generated. On the other hand, since a non-magnetic ceramic (40) is placed on the surface facing the magnetic gap, the core of the magnetic head and the FD do not come into contact with each other, and the FD that slides in contact with the ceramic (40) is magnetically No information is recorded or played back. Also, the medium suction device (33)
Since two magnetic heads are placed on both the upper and lower surfaces in the longitudinal direction (that is, the radial direction of the disk), by operating the other magnetic head, magnetic information can be recorded on the other FD in the same way as above. , can be played. When recording or reproducing information on another track, the stepping motor (29) is energized and the swing arm (26) is rotated around the shaft (27) 3 to change the position of the medium suction device (33). , information can be recorded and played back on other tracks.

By stopping the power supply to the disc motor (24),
The rotation of FD (20) is decelerated and the air flow generated on the surface of FD disappears. Therefore, the medium suction device (33)
The air pressure on the tapered surfaces (34) and (35) is negative pressure (
The contact between the medium suction device (33) and the FD (20) is released by the bending rigidity of the FD, and the tapered surface and the FD are in a non-contact state.

In this way, when recording on or reproducing from the FD (20), the FD is attracted by the medium suction device (33) by the air flow generated as the FD rotates, and the magnetic head is moved while the vibration of the medium is suppressed. come into contact with.

Furthermore, even if minute protrusions or abrasion powder on the FD are present between the FD and the tapered surface, the F
Due to D's flexibility, FD leaves and does not cause fatal destruction.

- The magnetic head (36) is adhesively fixed to the six main body arms (33a) and the tapered surfaces (34) (35) are formed using a tangential surface grinder, so that the magnetic gap surface of the magnetic head and the tapered surface of the main body arm are formed. It is possible to match the heights with high accuracy, and even if the rigidity of the base of the magnetic disk device is reduced, the relative height between the magnetic head and the tapered surface remains unchanged. In this way, there is no need to adjust the height between the FD vibration-static surface and the magnetic head, which has been a problem with conventional devices.

In addition, the rigidity of the base of the magnetic disk device, etc. can be lowered, and the magnetic disk device can be made thinner and lighter.

Furthermore, conventionally, magnetic heads were supported individually by arms, but since two magnetic heads can now be fixed to a single main body arm, the arm supporting the magnetic heads can be eliminated. Also, by reducing the number of arms, the magnetic head can be
The mechanism that connects the head drive mechanism that drives in the radial direction of D and the arm can be made thinner and lighter. Reducing the number of arms in this way leads to a reduction in the load mass on the head drive mechanism, and even if a small and lightweight head drive mechanism is used, the time for moving the head device in the radial direction (seek time) can be shortened.

The first invention of this invention has been explained above, but the seventh invention
The figure shows a second invention, and the one shown in Fig. 7 uses a magneto-optical recording flexible disk (magneto-optical FD) instead of the magnetic recording FD explained so far, and the magneto-optical FD is sandwiched between A laser light source (47) and a detector (48) that converts the laser light reflected from the magneto-optical FD into an electrical signal are arranged on the opposite side of the head, and the medium suction device W (33) of the first invention is similarly attached to this. By using the same, an equivalent magneto-optical disk device can be constructed. In this case, the vibration amplitude of the magneto-optical FD in the magnetic head is on the submicron order, and a focusing mechanism, which is indispensable for optical disk devices, becomes unnecessary.

Naturally, instead of a magneto-optical FD, an optical FD that uses phase change, an optical FD that uses recording by hole formation, or an optical FD that uses reversible shape change can be used in the same manner as above. In addition, the effect of eliminating the need for a focusing mechanism can be expected.

[Effects of the Invention] Since the first and second aspects of the present invention are configured as described above, the relative positional accuracy between the flexible recording medium and the medium suction device can be maintained with high precision during rotation of the recording medium. Furthermore, it becomes possible to significantly reduce the impact force when the recording medium contacts the medium suction device that also serves as a recording/reproducing means, and it becomes possible to easily create a highly reliable large-capacity disk device. There is an effect that can be obtained.

[Brief explanation of drawings]

Figures 1, 2, 3 and 4 are the first figures of this invention.
1(a) and 2(b) show a plan view and a partially cutaway side view showing the overall configuration, and FIG. 2(a), (b), and ) is an enlarged view of the media suction device, (a) is the front view, (b) is its left side view,
(C) is a sectional view taken along line (C)-(C) in Figure (A), Figure 3 (A), (B), and (C) are configuration diagrams of the main body arm, (A) is a front view, and (B) is its Left side view, (c) is (c) - of figure (a)
(C) Cross-sectional view, Figure 4 (A), (B), and (C) are configuration diagrams of the magnetic head, (A) is a front view, (B) is a left side view, (C)
is a plan view, FIGS. 5 and 6 are explanatory diagrams of the operation of the medium suction device, FIG. 7 is a diagram corresponding to FIG. 6 showing the second invention of the present invention, and FIGS. 11 and 12 are configuration diagrams of conventional disk devices, and FIGS. 13, 14, and 1
FIG. 5 is an explanatory diagram of the operation of a conventional disk device. In the figure, (20) is the recording medium, (24) is the motor, and (3
3) is a medium suction device, (36) is a magnetic head, (47)
is a laser light source, and (48) is a detector. Fig. 2 (A) 20 = Akebono bite [Buko 1 Mi 24: Soft 33: Medium suction device 36: Warming head Fig. (B) (A) Fig. Fig. Fig. [i) A (I) Button 0＼) Figure 48: Data box Figure 10

Claims (2)

[Claims] (1) A plurality of flexible magnetic recording media that face each other, a magnetic head that records and reproduces information on these recording media, a main body arm that supports the magnetic heads, and a medium drive motor that rotates the recording media. In a disk device equipped with
This medium suction device, in which the magnetic head and the main body arm are integrally configured and has a function of suctioning the recording medium as it rotates and stabilizing its vibration, is installed between the plurality of recording media. A disk device characterized in that: (2) A flexible optical recording medium is used in combination with a laser light source that emits light that illuminates the optical recording medium and a photoelectric conversion detector that converts the light reflected from the optical recording medium into an electrical signal. A disc device characterized in that a medium suction device is attached to the disc device, which also serves as a recording/reproducing means for sucking the optical recording medium as it rotates and stabilizing its vibrations.