JP2000268530A - Memory disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a memory disk device which can suppress a windage loss accompanying a high-speed rotation and can embody a high-density recording of information without entailing the soaring of the production cost with a simple construction. SOLUTION: This memory disk device has a magnetic head 54 for reading and writing the information to and from a memory disk 50 in which the information is stored and an arm 56 which is arranged with this magnetic head 54 at its front end so as to move the magnetic head 54 to move on the surface of the memory disk 50 and is freely movably supported in a casing and has hermeticity in the casing. The memory disk device has pump means 62 and 63 operated by moving of the arm 56 and the pressure in the casing is reduced by these pump means 62 and 63.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hard disk,
The present invention relates to a storage disk device that stores information on a disk and reads / writes information, such as an optical disk, a magneto-optical disk, and a large-capacity floppy disk, and in particular, a storage disk device capable of realizing high-speed rotation of a storage disk or high-density recording of information. About.

[0002]

2. Description of the Related Art A conventional storage disk device will be described with reference to FIG. 3 taking a storage disk device using a hard disk as a storage disk as an example.

The storage disk device shown in FIG. 3 comprises a storage disk 50 storing information and a motor 52 mounted on the storage disk 50 so that the storage disk 50 rotates.
An arm 56 having at one end a magnetic head 54 for reading and writing information from and to the storage disk 50;
A bearing 58 for swingably supporting the arm 56 so that the arm 56 can move on the storage disk 50, a swing actuator 60 at the other end of the arm 56 for swinging the arm 56, a motor 52, It has a head 54 and a circuit portion 62 for controlling the swing actuator 60. These main components are arranged on a base 64 constituting a housing. In this device, a magnetic head 54 comes close to a rotating storage disk 50 in a non-contact manner when reading and writing information. When the arm 56 swings about the central axis of the bearing 58, the magnetic head 54
Move so as to draw an arc on zero. The timing of the movement of the magnetic head 54 is arbitrary because it depends on reading and writing of information. The base 64 forms a housing with a cover (not shown), and the inside of the housing is a sealed space that maintains cleanliness. The inside of the housing has a breathing hole (not shown) for adjusting the air pressure with the outside of the housing so that a pressure change caused by a temperature change or the like does not cause a problem in reading and writing information. The breathing hole is sealed with a filter to prevent dust and moisture from entering the housing and to adjust the air pressure.

In such a storage disk device, in order to cope with an increase in the storage capacity of information in recent years, the rotation speed of the motor 52 is increased (for example, 10000 rotations per minute) or the rotation characteristics (for example, the fluctuation of the asynchronous component). Value (non repeatable r
un out)) to achieve high density recording.

[0005]

By the way, as the storage disk 54 rotates at a higher speed, the air on the disk surface becomes a resistance and hinders the rotation of the motor 52. That is, in the conventional storage disk device, the rotational torque required to rotate the motor 52 is large and the power consumption required for the operation of the device is increased so that the windage cannot be ignored. An increase in power consumption causes a heat generation amount of the motor 52 and the circuit portion 62, and there is a problem that rotational characteristics are deteriorated due to thermal expansion of members.

As another problem, the higher the speed of the storage disk 50, the greater the turbulence of the airflow on the disk surface and the greater the vibration of the storage disk 50. The vibration of the storage disk 50 may cause a large positional shift with respect to the magnetic head 54 and cause an error in reading and writing of information, which is an obstacle in realizing high-density recording.

As one of the means for solving the problem associated with the high speed rotation of the rotating body such as the storage disk 50, for example, Japanese Patent Application Laid-Open No. Hei 10-222960 discloses a space in which the rotating optical disk 3 exists. By making the airtight chamber 8 (the airtight chamber 8 of the publication) airtight and depressurizing the space with a vacuum pump, the air resistance acting on the rotating optical disk 3 is reduced, and the power consumption of the motor on which the optical disk 3 is mounted is reduced. It is stated that reduction is to be achieved. However, when the means disclosed in the above publication is applied to the above-mentioned storage disk device, a vacuum pump is an essential component, so that the device becomes larger or more complicated, and is not feasible in view of the manufacturing cost.

[0008] CDs and Ds other than the hard disk
Even in the case of storage disks such as an optical disk such as a VD, a magneto-optical disk, and a large-capacity floppy disk, the rotation speed tends to increase with the increase in storage capacity in recent years, and the same problem as described above occurs.

The present invention solves the above-mentioned problems of the prior art, and realizes a storage disk device capable of suppressing a windage caused by high-speed rotation and realizing high-density recording of information by a simple configuration without increasing production cost. The task is to provide.

[0010]

In order to solve the above-mentioned problems, a storage disk device according to the present invention comprises: a read / write head for reading / writing information from / to a storage disk in which information is stored; An arm in which the read / write head is disposed at the tip and movably supported so as to move the disk surface, and in a storage disk device having an airtight interior of a housing, a pump operated by moving the arm Means, and the inside of the housing is depressurized by the pump means.

The relationship between the pump means and the arm can be such that the power can be transmitted directly through the arm or the power can be transmitted through the power transmission means. In either case, the drive source of the pump means is based on the movement of the arm. Shall be. There are various types of storage disks, such as magnetically recorded ones, optically recorded ones, and combinations thereof, and there are also various types of read / write heads according to these recording methods.

With such a configuration, a rotating body such as a storage disk or a motor for rotating the storage disk which is placed under low pressure has reduced air resistance during rotation, and accordingly requires less rotating torque. The power consumed to operate a storage disk device such as a motor is reduced. That is, even if the storage disk rotates at high speed, windage loss can be suppressed. Low power consumption means that not only the running cost of the device is low, but also the heat generation is small and the heat problem of the components constituting the device (for example, the rotational characteristics caused by the deformation of members accompanying the thermal expansion of the motor that rotates the storage disk). Can be resolved.

[0013] Further, by reducing the above air resistance,
Since the turbulence of the air flow on the storage disk surface is reduced,
The vibration of the disk itself is reduced. That is, since the positional deviation between the read / write head and the storage disk becomes narrower, high-density recording of information can be realized.

In the above structure, the arm may be a storage disk device which is supported so as to be swingable. To support the arm swingably means, for example, that the rod-shaped arm is supported by a bearing on a support shaft orthogonal to the arm. The arm is
The read / write head moves across the storage disk surface with an actuator positioned opposite the read / write head about the support axis. At this time, the arm swings about the support shaft.

In the above configuration, the arm may be a storage disk device that is supported so as to be able to reciprocate on a straight line. To support the arm so that it can reciprocate freely, for example, a pickup unit (corresponding to a read / write head) reciprocates in the radial direction on the storage disk surface by an actuator that linearly moves.

Further, the pump means having the above-mentioned construction has a valve-shaped suction port for sucking air into the pump body and a valve-equipped exhaust port for discharging air out of the pump body. It is preferable to provide a mechanism for sucking the air in the housing through the suction port based on the expansion and contraction operation of the pump and a mechanism for exhausting the air in the pump body to the outside of the housing through the exhaust port.

Regardless of whether the arm is swingable or reciprocally movable on a straight line, the arm repeatedly moves within a predetermined range in accordance with the stored information. The inside of the housing is decompressed.

Further, in the above-mentioned storage disk device, it is preferable to perform control for moving the arm only to operate the pump means irrespective of reading and writing of information of the magnetic head.

By doing so, for example, the control circuit of the storage disk device causes the arm 56 to swing to achieve a low pressure state at the time of startup, and thereafter, when the pressure is increased by the air pressure sensor, reading and writing of information is performed. Arm 5 regardless
6 can be configured to incorporate the control for swinging, thereby achieving or maintaining the low pressure state more reliably.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of a storage disk device according to the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 1 is a plan view of a storage disk device using a hard disk as a storage disk, in which a cover forming a housing is omitted. FIG. 2 is a sectional view of one of the components of the storage disk device. FIG.
Has the same basic configuration as the conventional storage disk device described with reference to FIG. 3, and the following description will focus on the differences.
The same reference numerals in both figures indicate the same members and the same parts.

As shown in FIG. 1, a motor 52 for mounting a storage disk 50 is arranged on a base 64 constituting a housing. The U-shaped arm 56 is swingably supported by a support shaft 64a erected on a base 64 via a bearing 58 provided orthogonal to the arm. The tip of the arm 56
A magnetic head 54 is arranged on the surface of the storage disk 50 with a small gap. At the other end of the arm 56, a swing actuator 60 for swinging the arm 56 is arranged. The swing actuator 60 is composed of a voice coil 60a on the arm 56 side and a magnet 60b arranged on the base 64 so as to be close to the voice coil 60a. By controlling the energization of the voice coil 60a, the arm 56 is supported by the support shaft 64a. , A predetermined range (a range in which the magnetic head 54 can move at least the radius of the disk) D is moved horizontally. On the other end of the arm 56, a pair of pump means 62,
63 is arranged. The base 64 forms a housing with a cover (not shown). The inside of the housing is a sealed space that is kept clean so as not to interfere with reading and writing of information, but has a breathing hole (not shown) in the housing so that the pressure difference inside and outside the space does not become excessive.

In this storage disk device, the storage disk 50 is made of aluminum and has a diameter of 3.5 inches and rotates at about 10,000 revolutions per minute. The magnetic head 54 is at a position where the magnetic head 54 does not read or write information or is retracted from the disk surface as shown by a solid line when the power is off, and is located on the disk surface as shown by a virtual line when reading or writing information. Reading and writing of information is performed by a command from a connected personal computer. The magnetic head 54 moves along a circular arc on the disk surface within a predetermined range D in accordance with the content of the information, but the information is read and written arbitrarily, so that the magnetic head 54 repeatedly moves irregularly. At this time, the arm 56 swings.

As shown in FIG. 2, the pump means 62 (63) has a bellows-like cylindrical shape made of a thin resin film, and has a valved suction port 62a (63a) and a valved exhaust port 62b ( 63b) and is extendable and retractable. This expansion / contraction characteristic is such that the arm 56 can expand and contract sufficiently by swinging. The valved suction port 62a (63a) operates so as to open when the volume of the pump means body is in an extended state toward an increase and to close when the pump means body is in a contracted state toward a decrease. The valved exhaust port 62b (63b) operates so as to close when the volume of the pump means main body is in the extended state toward increasing and to open when in the contracted state toward the decreasing side. The valves prevent backflow during each intake and exhaust and leakage at rest. The valved suction port 62a of the pump means 62 opens into the housing, and the valved exhaust port 62b communicates with the valved suction port 63a of the pump means 63 via a pipe (not shown). The valve-equipped exhaust port 63b of the pump means 63 is
Is connected through a pipe (not shown) to a through-hole (not shown) communicating with the outside of the housing provided in the. That is, the valve-equipped suction port 62a constitutes a mechanism for sucking air in the housing into the pump means, and the valve-equipped exhaust port 63b constitutes a mechanism for exhausting air in the pump means body to the outside of the housing. Pump means 62,
63 is directly connected across the arm 56,
Each time the 移動 moves, it is in a state of expansion and contraction opposite to each other.

In this way, every time the arm 56 moves, that is, while the apparatus is in use, the pump means 62 and 63 must be used.
Operates, so that the air in the housing is exhausted to the outside of the housing.
Then, the pressure in the housing is reduced to achieve a low pressure state. The evacuation operation is performed up to the limit of the pumping ability inherent to the pump means 62 and 63 with respect to the pressure difference between the inside and outside of the housing. Thereafter, the pump means 62 and 63 are operated, but the air pressure inside and outside the housing is balanced, and the evacuation operation is substantially ended, and the low pressure state is maintained.

When the inside of the housing is in a low pressure state, the air resistance acting on the rotating body is reduced as described above. The rotating body of this example is a storage disk 54 and a motor 52,
Can reduce the power consumption and reduce the windage loss because the same rotational speed can be achieved with a smaller torque than in the prior art.

The reduction in power consumption not only reduces the running cost of the apparatus, but also reduces the amount of heat generated and reduces the heat problems of the components constituting the apparatus (for example, the rotation caused by the deformation of members caused by the thermal expansion of the motor 52). Bad characteristics)
Can be eliminated.

Further, the reduction of the air resistance reduces the turbulence of the air flow on the surface of the storage disk 50, so that the vibration of the disk itself is reduced. Even if the rotation speed is the same as the conventional one, the vibration is small and the rotation characteristics (for example, a non-repeatable run out of an asynchronous component) do not deteriorate.
That is, since the displacement between the magnetic head 54 and the storage disk 50 becomes smaller, the high-density recording of information can be realized, and the capacity can be increased.

Since these effects do not significantly change the conventional configuration as described above, the effects can be realized at low cost not only when the design is changed in the conventional configuration but also when a new design is made. Does not lead to soaring costs.

In this embodiment, the pump means 62 and 63 are disposed on both sides of the arm 56. However, this means that the load on the arm 56 acts evenly and does not hinder the swing of the arm 56. We are careful about. However, even if the pump means is arranged only on one side, the above-described expansion and contraction can be realized and the same effect can be obtained. In this case, the weight is arranged on the other side so as not to hinder the swing of the arm 56. It is good to adjust as follows. Further, the pump means can freely change the expansion / contraction characteristics and the arrangement method (in this example, a method of connecting two in series) based on the material and volume in consideration of the required air pressure value and the timing thereof. Further pump means 6
Although the two and 63 are directly connected to the arm 56, the power may be transmitted through a known power transmission means.

In this embodiment, since the conventional structure is used, the pump means 62 and 63 are optional exhaust operations because they depend on reading and writing of information. May not be maintained. In such a case, for example, the control circuit of the storage disk device swings the arm 56 in order to achieve a low pressure state at the time of startup, and thereafter, when the pressure is increased by the pressure sensor, regardless of reading and writing of information. It is preferable to incorporate a control for swinging the arm 56 into the arm.

(Second Embodiment) Next, a second embodiment of the storage disk device according to the present invention will be described.
A storage disk device using an optical disk such as M or DVD, a magneto-optical disk, or a large-capacity floppy disk as a storage disk will be described. Optical disks are roughly classified into a read-only type and a read / write type. For example, JP-A-6-215386 discloses a storage disk device of a CD-ROM. These devices are
The detailed mechanism differs depending on the storage capacity, recording method, etc., but the portion corresponding to the read / write head is that both devices reciprocate linearly in the radial direction with respect to the disk surface as described in the same publication. Common.

In any of the apparatuses, the pump means described in the first embodiment is disposed directly connected to the read / write head. For example, the pump means is disposed at one end of a sliding carriage provided with an objective lens (corresponding to a read / write head) described in the publication. The inlet and outlet are arranged as described above.

In any case, the hermeticity of the space in which the storage disk is arranged is the first because the storage disk is attached and detached.
It has a looser structure than the hard disk described in the embodiment. Therefore, in this example, it is preferable to increase the pumping capacity to set a larger exhaust amount, or to close the gap in the space where the storage disk is arranged to improve the airtightness. In each case, the same effects as those of the first embodiment can be obtained, and thus the description thereof is omitted.

Although the embodiments of the present invention have been described above, modifications other than those described above are possible without departing from the gist of the present invention, and the present invention is not limited thereto. For example, also in the storage disk device of the first embodiment, there is a type in which the read / write head (magnetic head 54) reciprocates on a straight line as described in the second embodiment. In this case, in the second embodiment, The same effect can be obtained by disposing the pump means as described.

[0035]

According to the first aspect of the present invention, since the pump means operates by using the driving force of the arm, the inside of the housing is depressurized by a simple structure without newly adding a driving source for the pump means. To a low pressure state. This makes it possible to realize high-density recording of information by high-speed rotation and high-rotation characteristics of the storage disk while reducing power consumption and heat generation in the storage disk device with a simple configuration.

According to the second or third configuration, application to an existing storage disk device can be realized with a simpler configuration.

According to the structure of the fourth aspect, the pump means can be operated with the driving force generated by the swinging of the arm or the reciprocating movement in a straight line as the driving source efficiently.

According to the configuration of claim 5, it is possible to more reliably achieve or maintain the low pressure state.

[Brief description of the drawings]

FIG. 1 is a plan view showing a storage disk device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing components of the storage disk device of FIG. 1;

FIG. 3 is a perspective view showing a conventional technique.

[Explanation of symbols]

 Reference Signs List 50 storage disk 54 magnetic head (read / write head) 56 arm 62, 63 pump means 62a, 63a intake port with valve 62b, 63b exhaust port with valve

Claims (5)

[Claims] 1. A read / write head for reading / writing information from / to a storage disk in which information is stored in a housing, and the read / write head is disposed at the tip and movably so that the read / write head moves on the storage disk surface. A storage disk device having a supported arm and having a hermetically sealed inside of the housing, comprising: pump means that is activated by movement of the arm;
A storage disk device, wherein the inside of the housing is depressurized by the pump means. 2. The storage disk device according to claim 1, wherein said arm is swingably supported. 3. The storage disk device according to claim 1, wherein said arm is supported so as to be able to reciprocate on a straight line. 4. The pump means has a valve-shaped suction port for sucking air into the pump body and a valve-equipped exhaust port for discharging air out of the pump body. 4. The storage disk device according to claim 1, further comprising: a mechanism for sucking air in the housing through an intake port based on an operation, and a mechanism for exhausting air in the pump body out of the housing through an exhaust port. 5. The storage disk device according to claim 1, wherein control is performed to move said arm only to operate said pump means regardless of reading and writing of information of said magnetic head.