JPS63104282A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the constitutional dimensions and weight and to speed up, etc., the operation of recording/reproduction by making an enclosure combined with a fitting framework in a way of shock absorbing, enclosing up tightly a magnetic head, a magnetic disk which are specified in terms of turning speed and access time, a positioning means and a turning means, etc. CONSTITUTION:High speed recording/reproduction of information are performed by a magnetic head 2 specified as average 12ms access time and a disk 1 specified as 5,000r.p.m., etc. A head disk assembly 3 for those components such as the head 2 and the disk 1, etc., and a voice coil motor 17, etc., are enclosed tightly with a spacious enclosure formed of 1st and 2nd parts which are connected each other. The constitution is eventually made smaller in size and lighter in weight and in addition the efficiency of the inner air is improved. This enclosure is arranged to be fitted to the frame 5 through shock absorbing mounts 4 to improve anti-vibration. Furthermore, the head positioning error caused by a thermal displacement is minimized, provided a servo disk is set in the middle of a number of disks.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording/reproducing apparatus, and more particularly to an information recording/reproducing apparatus equipped with a magnetic disk and capable of high-speed transfer of information.

[Conventional technology]

Recent information recording and reproducing devices, such as magnetic disk devices,
With the development of computer systems, larger capacities and faster transfer rates are progressing. Additionally, 5.25-inch and 3.5-inch magnetic disk drives have come to be used as external storage devices for desktop devices such as personal computers, and portable devices such as portable computers. It's coming. Unlike the magnetic disk drives used in large general-purpose computer systems, the magnetic disk drives used in small computer systems are generally built into a single body, so the magnetic disk drive consists of a head disk assembly (a rotating disc and It consists of a magnetic head and its positioning mechanism in an integrated sealed structure (generally called an HDA) and its peripheral circuits. Therefore, these magnetic disk drives are classified into 8-inch, 5-inch, and 3.5-inch devices depending on the outer diameter of the disk used, and each has a size that is the outer diameter of the disk plus about 10rrtn. One side of the device consisted of

Also, what is the storage capacity of these magnetic disk devices?

The amount of data is increasing year by year, and the time required to position the magnetic head (average access time) is also being shortened as the storage capacity increases. For example, an 8-inch disk device has a storage capacity of 170 to 600 megabytes and an access time of 18 to 23 m5ec, a 5-inch disk device has a storage capacity of 20 to 380 megabytes, and an access time of 85 m5ec, -20 m5ec, and a 3.5-inch disk device. In this case, the storage capacity is 10 to 40 megabytes and the access time is 85 to 40 msec.

However, the rotational speed of the disc is approximately 36
00γpm, and the average rotation waiting time is about 8.
3m5ec is required.

By the way, on average, the time required to read certain information from a magnetic disk device is the sum of the average access time mentioned above and the average rotational wait time. By shortening the average access time, which used to take a long time, the time it takes to read information has been shortened. Methods to shorten this average access time include reducing the weight of the magnetic helad arm, which is a movable mass, increasing the driving force using a large voice coil motor, and reducing the movable stroke of the disk so that it is closer to the inner circumference. A structure in which a plurality of magnetic heads are attached to one disk surface so that each magnetic head is assigned to the outer circumferential side is also used. However, the method of reducing this average access time even further than it currently is has become technically quite difficult, and is inferior to increasing the storage capacity of magnetic disk devices, resulting in a decline in the performance of systems using magnetic disk devices. It is supposed to hinder improvement.

A related device of this type is described in, for example, US Pat. No. 4,568.988. 3.
An example is a 5-inch magnetic disk device.

[Problem that the invention seeks to solve]

The above-mentioned conventional technologies do not provide any consideration for shortening the time required to read information written to a magnetic disk device or write information to a magnetic disk device, and are not designed to reduce the time required to read information written to a magnetic disk device or write information to a magnetic disk device, The problem was that it took a lot of time.

A first object of the present invention is to quickly record and reproduce information in an information recording and reproducing device, for example, a magnetic disk device, thereby improving the performance of the entire computer system.

A second object of the present invention is to provide an information recording and reproducing apparatus that can record and reproduce information at high speed.

A third object of the present invention is to provide an information recording/reproducing device that is small and lightweight and capable of efficiently absorbing external vibrations.

A fourth object of the present invention is to provide an information recording/reproducing device that is small in size and has good internal air efficiency.

A fifth object of the present invention is to provide an information recording and reproducing apparatus that can reduce head positioning errors (thermal off-track) caused by thermal displacement.

[Means for solving problems]

The first and second objects described above are achieved by increasing the number of rotations of the disk, thereby shortening the average rotational waiting time and, as a result, shortening the time for recording and reproducing information.

The third object can be achieved by providing a fixed frame that supports the enclosure with a stroke through vibration absorbing means.

The fourth purpose is to include a first part that covers approximately half of the enclosure along the outer periphery of the magnetic disk, and a first part that is connected to the first part, has a larger internal space than the first part, and houses a voice coil motor. This is achieved by providing a second portion that

The fifth object is achieved by providing a servo disk on which servo data for head positioning is recorded approximately at the center of the plurality of magnetic disks.

[Effect]

A disk that records information is attached to a spindle that is supported by bearings at both ends, and is rotated at high speed by a motor that is directly connected to the shaft. This reduces the vibration and vibration of the disc, allowing it to rotate stably even at high speeds. Also,
Since the disk is small in diameter compared to the device size,
There is little windage loss due to high-speed rotation, and power consumption can also be reduced. In addition, it moves in the radial direction of a disk with an arm attached to a magnetic head that records and reproduces information on the disk.
The small-diameter disk allows a short distance to move, and the movable mass can be lightened, making it possible to move the disk at high speed using a large voice coil motor.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view of an embodiment of a magnetic disk device according to the present invention.

FIG. 2 is a plan view of the magnetic disk device shown in FIG. 1.

FIG. 3 is a sectional view of the magnetic disk device of FIG. 1.

FIG. 4 is a circuit block diagram of the magnetic disk device shown in FIG. 1.

The magnetic disk device shown in FIG. 1 includes magnetic disks 1.
Magnetic head 2. A head disk assembly (hereinafter referred to as HDA) 3 that almost hermetically houses an actuator including a voice coil motor that moves the magnetic head 2 in a radial direction of the magnetic disk 1; a frame 5 for holding the HD A; a decorative plate 6 provided within the frame 5; a peripheral circuit assembly 7 including a read/write circuit for the magnetic head 2 to record and reproduce information on the magnetic disk 1;
The HDA 3 is provided with a fan 27 for blowing outside air around the HDA 3 to cool the HDA 3. The frame 5 also has a screw hole (not shown) for attaching the magnetic disk device to the system's enclosure. One side D of the outer diameter of the HDA 3 (this is the outer diameter of the disk 1 (representative) is smaller than the width dimension W of the magnetic disk device, and the frame 5
A sufficient stroke is given to the buffer mount 4 provided between the and HI3A3.

The inside of the HDA 3 is shown in FIGS. 2 and 3.

This HDA 3 consists of a housing 8 and the following main parts built into it. It consists of a rotating disk 1 and a spindle 9 that supports it. The spindle 9 further includes a hub 10, a shaft 11, and a bearing 12. A spindle motor 12 for driving the spindle is provided at one end of the shaft 11, and the disk 1 is attached to the hub 10 with a clamp 13.

The magnetic head 2 is attached to an arm 15 that can rotate around a pivot 14 via a jingle 16, and a voice coil motor (VCM) 1 is integrated with the arm 15.
7, it is movable in the radial direction of the disk 1. Here, the disks 1 are stacked with a spacer 18 in between, and magnetic heads 2 are arranged on both sides or one side of each disk 1, and information can be sequentially recorded and reproduced from a plurality of magnetic heads 2 at the same radial position. It is.

Here, in the magnetic disk device of this embodiment, the number of stacked disks 1 is 14, which is larger than that of the conventional magnetic disk device. Therefore, in order to reduce the displacement of the spindle 9 due to the rotation of the disk 1, bearings are installed at both ends of the hub 10.
9 and 2o are arranged, and both ends of the shaft 11 are fixed to the housing 8 and cover 20 of the HDA 3. At this time, the shaft 11 fixed to the cover 20 is provided with an elastic element that is rigid in the radial direction and elastically coupled in the axial direction. Furthermore, the bearings 19 and 20 that support the shaft 11 have different diameters, and the rotation cycles of the poles and retainers of the bearings 19 and 20 are different from each other, which has the effect of reducing shaft vibration (in this case, hub vibration). have. Also, bearing 1
Seals 20 and 21 are located on both sides of the hub 10 at 9 and 20, respectively.
is arranged to prevent mist emitted from the lubricant of the bearings 19 and 20 from diffusing into the HDAa.

Further, in FIG. 3, the rotating hub 10 and arm 15 are
The inner rings of bearings 19, 20 and 24 are fixed to the respective shafts 11 and 14, respectively.
Further, the shafts 11 and 14 are fixed to the housing 8. The shafts 11 and 14 are connected to housing blocks (
It is also possible to fix it to the housing 8 via a screw (not shown).

The arm 15 to which the magnetic head 2 is attached is connected to the shaft 1
4, and the other end has a voice coil motor 17.
coil can be installed. The voice coil motor 17 including the magnet is housed in a housing 8 that is enlarged compared to the diameter of the disk 1, and the voice coil motor 10 can be made larger, making it possible to position the magnetic head 2 at high speed. can. Further, on the other side of the housing 8, which is enlarged compared to the diameter of the disk 1, there is provided a flexible printed wiring board 22 on which a part of a recording/reproducing circuit for the magnetic head 2 to record/reproduce information is mounted. The peripheral circuit assembly 7 is connected to the peripheral circuit assembly 7.

Furthermore, since the flexible printed wiring board 22, which is electrically connected to the magnetic head 2 and transmits information to the outside, is housed in an enlarged area of the housing 8, the curvature of the wiring board 22 can be increased, and the bending life can be increased. extension and voice coil motor 1
The load on 7 can be reduced.

The surface of the arm 15 facing the disk 1 has a position that does not interfere with the disk 1 even when the magnetic head 2 moves to the innermost circumference of the disk 1, and the surface of the stacked arm 15 facing the disk 1 is located at a position where it does not interfere with the disk 1 even when the magnetic head 2 moves to the innermost circumference of the disk 1. They are arranged so as to cover the outer edge of the disk 1 without any gaps between them. Thereby, the fluid (for example, air, helium gas, etc.) that flows around the disk 1 rotating at high speed can flow along the disk 1 without swirling inside the housing 8, and the ineffective load on the spindle motor 12 can be reduced.

In FIG. 3, a servo head 2a for reading position information for positioning the magnetic head 2 is provided approximately in the center of the stacked arms M, and a servo head 2a for reading position information for positioning the magnetic head 2 is provided, and a disk 1a corresponding to the servo head 2a is provided.
A dedicated magnetic head insertion window 23 is provided on the side surface of the housing 8 for writing position information in advance. This dedicated magnetic head insertion window 23 is provided so that a magnetic head for writing servo tracks, which serves as the reference position of the head, can be inserted into the dedicated magnetic head insertion window 23 during manufacture of this device.

By providing the servo disk 1a and the servo head 2a in the center, off-track caused by spindle collapse due to thermal displacement can be evenly distributed above and below the disk 2, and as a result, a highly reliable magnetic disk device can be provided. .

Further, as shown in FIG. 1, a fan 27 for cooling the HDA 3 is mounted on the frame 5 to reduce the temperature rise of the HDA.

FIG. 4 is a block diagram showing the circuit configuration of the present invention.

The device is connected to the outside through a driving power supply connector 25 and an interface connector 26, and signals are received and received by the interface using the SMD method.

The circuit shown in this block diagram, excluding the data enclosure 420, is implemented in the peripheral circuit assembly 7 of FIG.

The circuit configuration shown in FIG. 4 will be explained below. This circuit is
It can be roughly divided into an upper head positioning system, a lower data recording/reproducing system, and a spindle motor drive system.

The head positioning system is a voice coil motor drive that drives the voice coil motor 17 according to a command transferred from a higher level and stored in a command register 41 or a read/write command, and a head address stored in a head address register 42. A circuit 45, a servo signal detection circuit 45 that detects the position of the head 2 based on servo data read from the servo head 2a, and an access controller 43 that controls these circuits.

The data recording/reproducing system includes a modulation/demodulation circuit that modulates and demodulates data transferred from the host and data read from the disk 1 from, for example, an NRZ modulation system to a 2-7RLLC modulation system, a write amplifier 48, and a read amplifier 49, and includes a write amplifier 48 and a read amplifier 49. The motor drive system includes a motor drive circuit 41 that rotationally drives the spindle motor 12 according to instructions from a higher level.
Contains 0. This motor drive circuit 410 rotates the spindle motor 12 at 50 rpm, and is controlled to contact start and stop of the magnetic head 2.

〔Effect of the invention〕

According to the present invention, a 5.25-inch diameter disk that is about 50% lighter and has about 15% lower inertia can be rotated at about 40% higher speed in a magnetic disk device with an 8-inch shape element, so the average rotational waiting time is about 50% faster. It can be reduced by 30%.

Furthermore, it is possible to use a voice coil motor that is larger than the device dimensions, and the moving distance is about 50% shorter, making it possible to access approximately 12m5 with an average access time of about 60%. Since about 14 disks can be stacked, it is possible to provide a large capacity magnetic disk device of about 700 megabytes.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic disk device according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a
It is an A-line sectional view. FIG. 4 is a circuit block diagram of a magnetic disk device showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Disk, 2...Magnetic head, 3...Head disk assembly, 4...Buffer mount, 5...
-Frame, 9...Hub, 12...Spindle motor, 14...Axis, 15...Arm, 17...Voice coil motor. 7... Peripheral circuit assembly. 20 8-・7U-mu/l・-・axis/4-・jyu/7--voice coil motor

Claims (1)

[Claims] 1. An information recording/reproducing device for recording/reproducing information, comprising at least one magnetic disk, a magnetic head for recording/reproducing information on the magnetic disk, and a magnetic head for recording/reproducing information on the magnetic disk. a positioning means that moves in the radial direction of the magnetic head and positions the magnetic head at a target position at an average speed of 12 milliseconds; a rotation means that rotates the magnetic disk at approximately 5000 revolutions per minute; and a rotation means that rotates the magnetic head, magnetic disk, positioning means, and rotation means. an enclosure that covers the enclosure in a substantially airtight manner; a substantially box-shaped fixed frame that holds the enclosure; and a buffer that is located between the enclosure and the fixed frame and absorbs shocks applied between the enclosure and the fixed frame. An information recording and reproducing device comprising: 2. The information recording and reproducing apparatus according to claim 1, wherein the magnetic disk has a diameter that is approximately 60% of the width of one side in the short direction of the fixed frame. 3. In the information recording and reproducing apparatus according to claim 2, the diameter of the magnetic disk is about 5. An information recording and reproducing device characterized by being 25 inches. 4. In the information recording and reproducing device according to claim 1, the distance between the enclosure and the fixed frame is about 20
An information recording and reproducing device characterized in that the shock from outside the fixed frame is absorbed by the stroke of the buffer means provided at the interval. 5. The magnetic disk device according to claim 1, wherein the enclosure includes a first portion that covers approximately half of the outer periphery of the magnetic disk along the outer periphery;
is connected to the first part, and has a larger internal space than the first part;
an information recording/reproducing device comprising: a second portion housing the voice coil motor; 6. In the magnetic disk device according to claim 1, the rotating means holds at least ten magnetic disks, and rotates a magnetic disk located approximately at the center of the plurality of magnetic disks. , a magnetic disk device characterized by recording servo data for head positioning.