JPH11328925A - Storage device having rotating type recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage device having a rotating type recording medium capable of suppressing an increase in the internal temperature of a case. SOLUTION: This storage device includes a motor 7 for rotating a disk recording medium 5, and a data writing/reading device 9, for writing/reading data in/from the recording medium 5, which are disposed in a case 3. A cooler 11 for reducing the temperature inside the case 3 by absorbing heat from the case 3 and actively discharging the same is attached to the surface of the top board 3a of the case 3. The cooler 11 is composed of a heat sink 13, and a blower 15 for blowing wind along the surfaces of a plurality of hear radiating fins provided in the base 13a of the heat sink 13 and the base 13a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium rotating storage device such as a hard disk used as a large-capacity storage device of a personal computer.

[0002]

2. Description of the Related Art At present, the number of rotations of a motor for rotating a recording medium of a recording medium rotary storage device such as a hard disk is such that a data transfer speed is 5 MB / s to 20 MB / s and a bus width is 8 bits. , About 5200 to 5400 rpm. However, the data transfer speed is 40MB / s
When the bus width becomes 16 bits, the rotation speed of the motor becomes 72
It becomes as high as 00 to 12000 rpm. Obviously, the spread of 3D, AGP, and the like will further increase the data transfer speed, and it will be apparent that the number of rotations of the motor will further increase accordingly.

[0003]

As the number of rotations of the motor increases, not only does the amount of heat generated from the stator windings of the motor increase, but also the heat generated from the bearings of the rotation shaft increases. Also has an increased thermal expansion. Further, the thermal expansion of each component constituting the data writing / reading device also increases, and a writing error or a reading error occurs.
Also, when the amount of thermal expansion of the rotating shaft increases and the stress generated at the joint between the rotating shaft and the recording medium increases,
Vibration generated from the rotating rotating plate increases. This vibration is detected by the vibration sensor, and when the vibration amount exceeds the allowable amount,
The motor control circuit reduces the rotational speed to a level where the vibrations fall within an acceptable range. For this reason, the maximum rotation speed of the motor cannot be utilized, and as a result, there is a problem that the data reading speed is reduced.

An object of the present invention is to provide a recording medium rotating type storage device capable of suppressing an increase in the internal temperature of a case.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording medium rotary storage device which can prevent a data write error or a read error from occurring and can rotate a motor at a predetermined maximum rotational speed. It is in.

Another object of the present invention is to provide a recording medium rotary storage device capable of efficiently radiating heat generated by a motor.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a motor for rotating a disk-shaped recording medium, and a data writing and reading device for writing data to the recording medium and reading data from the recording medium. The object of the present invention is to improve a recording medium rotating storage device incorporated in a case. In the present invention, the type of recording medium and the recording method are arbitrary. For example, the recording medium may be any of a magnetic disk, an optical disk and the like, and the recording system may be any of a magnetic system and an optical system.

In the present invention, a cooling device is mounted on the surface of the case to reduce the internal temperature of the case by absorbing heat from the case and positively radiating the heat.
Here, the cooling device may have any structure as long as it can actively absorb heat from the case. Further, the mounting position of the cooling device is arbitrary. If the temperature inside the case is lowered by using the cooling device as in the present invention, a data write error or a read error occurring due to a rise in the temperature inside the case can be prevented, and the motor can be planned. You can rotate at the maximum rotation speed.

The cooling device comprises, for example, a heat sink having a plurality of radiating fins on the surface of a plate-like base, and a blower for flowing air along the surfaces of the plurality of radiating fins of the heat sink and the surface of the base. it can. When using such a heat sink with a cooling fan or a cooling device with a heat sink, the back surface of the base of the heat sink may be directly attached to the surface of the case,
It may be attached indirectly via a heat transfer member. When the base of the heat sink is directly attached to the case, an attachment that can press and fix the cooling device against the case may be used. When the base of the heat sink is indirectly attached to the case via the heat transfer member, if a joining means such as a double-sided tape is used as the heat transfer member, the cooling device can be easily mounted without using the above-mentioned dedicated mounting tool. Can be mounted against

[0010] It is preferable that the above-mentioned air blower be mounted on the surface of the base of the heat sink so as to blow air toward the base and the plurality of radiating fins. This is to prevent the air whose temperature has risen due to heat absorption from being applied to the motor of the blower, thereby extending the life of the motor. Further, in this case, it is preferable that the plurality of radiating fins of the heat sink be configured to guide the wind blown from the blower to four sides outside the base. In this way, heat can be absorbed in almost the same state from almost the entire base of the heat sink,
The effect of absorbing heat from the case can be increased. The case can also be cooled by air blown out from the heat sink.

The structure inside the case is basically arbitrary. However, since the heat source is a motor, it is preferable to arrange the motor in the case so that the heat generated from the motor is easily transmitted to the case in order to increase the cooling efficiency. Therefore, the motor is disposed inside the case so as to be fixed to the wall of the case to which the cooling device is attached. With this configuration, the heat generated from the windings of the stator of the motor can be transmitted directly or with a short heat transfer distance to the wall of the case to which the cooling device is attached, thereby increasing the cooling efficiency.

Preferably, the cooling device is mounted on a surface of the case so as to face a motor disposed inside the case via a wall of the case. This way,
As described above, when the motor is mounted on the wall of the case to which the cooling device is mounted, the heat transfer distance from the stator is particularly short, so that the cooling efficiency can be further increased.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view of an example of an embodiment in which a recording medium rotary storage device of the present invention is applied to a hard disk 1 used in a microcomputer. In the figure, reference numeral 3 denotes a metal box-shaped case. Inside the case 3, a spindle motor 7 for rotating a disk-shaped recording medium 5 made of a magnetic disk or the like, and data for the recording medium 5 are stored. Writing and recording medium 5
And a data writing and reading device 9 for reading data from the device. Although not shown, a drive control circuit for the motor, a vibration sensor, and the like are also built in the case 3.

The case 3 includes a rectangular top plate 3a and a bottom plate 3b, and a peripheral wall 3c having a rectangular outline when viewed from the top plate 3a connecting the top plate 3a and the bottom plate 3b.
In this example, the spindle motor 7 is
Mounted on The stator 7a of the motor 7 includes an exciting winding that is excited to rotate the rotor 7b, and heat generated from the stator 7a is directly transmitted to the top plate 3a. The recording medium 5 is fixed to one end of the rotating shaft 7c of the motor rotor 7b.

The data writing / reading device 9 includes a write head for writing data on the recording medium 5 and a read head for reading data from the recording medium. When a motor drive control circuit (not shown) detects a vibration detected by a vibration sensor (not shown) that is equal to or greater than a predetermined allowable maximum value, the motor drive control circuit stops the motor 7 to prevent contact between the head and the recording medium 5, In a range where the vibration is smaller than the maximum allowable value, the rotation speed of the motor 7 is configured to be reduced stepwise or gradually in order to prevent the head from contacting the recording medium 5 in accordance with the magnitude of the detected vibration. ing. Therefore, when a large vibration is applied from the outside while the motor 7 is rotating, or when the vibration generated inside the case becomes large due to thermal expansion or the like, the motor 7 stops or the rotation speed becomes higher than the maximum rotation speed. It rotates at a low rotation speed.

In FIG. 1, reference numeral 11 denotes a top plate 3a of the case 3.
Is a cooling device for lowering the temperature inside the case 3 by absorbing the heat emitted from the case 3 and positively radiating the heat. The cooling device 11 includes a heat sink 13 and a blower 15. The heat sink 13 is an integrally molded product made of aluminum and has a plurality of radiation fins 13 on a surface of a plate-like base 13a.
b ... are provided. The outline of the base 13a of the heat sink 13 has a substantially quadrangular shape, and the plurality of radiating fins 13b. Surface and each heat radiation fin 13
.. flows along the surface of b... and is led to four sides outside the base 13a. Specifically, the plurality of radiating fins 13b surround the outer peripheral portion of the impeller (not shown) of the blower 15 in the circumferential direction and are arranged so as to extend along the flow of air discharged from the impeller.

The blower 15 has an axial fan as a basic structure, and has a motor 15a such as a DC brushless motor.
Are supported by a housing 15b via three webs 15c, and an impeller (not shown) is fixed to a rotating shaft (not shown) of the motor 15a. The impeller of the blower 15 is connected to the base 13 of the heat sink 13.
and is configured to blow air toward the base 13a and the plurality of radiating fins 13b. That is, while being an axial fan, it is configured to positively discharge wind not only in the axial direction but also in the radial direction. The impeller includes a cup-shaped blade supporting member fixed to a rotating shaft of a motor, and a plurality of blades provided on a peripheral wall of the blade supporting member. In this example, a part of the impeller (not shown), specifically, a plurality of blades and a part of the blade support member, enter into a space surrounded by the plurality of radiating fins 13b of the heat sink 13. Therefore, the blower 11
Is considerably thinner. A plurality of blades of the impeller are fixed to the blade support member with an inclination to positively discharge wind in the radial direction.

The housing 15b of the blower 15 is provided integrally with a pair of locking hooks 15d at positions facing each other with the motor 15a therebetween. The blower 15 is locked to the heat sink 13 by being locked to a locked portion provided on the base 13a.

The cooling device 11 is indirectly attached to the surface of the top plate 3a of the case 3 on the back surface of the base 13a of the heat sink 13 via a double-sided tape using a thin metal foil serving as a heat transfer member as a support band. Can be The base 13a
If a concave portion is formed in a portion of the back surface where the double-sided tape is stuck, and a portion other than the portion where the double-sided tape is stuck is in contact with the surface of the top plate 3a of the case 3,
Even when the cooling device 11 is fixed to the case 3 using a double-sided tape, the cooling efficiency does not significantly decrease.

In this example, the motor 7 is mounted on the top plate 3 of the case 3.
a cooling device 11 is mounted on the top plate 3a of the case 3 so as to face the motor 7 disposed inside the case 3 via a wall constituting the top plate 3a of the case 3. Therefore, the heat transfer distance of the motor 7 from the stator 7a is the shortest, and high cooling efficiency can be obtained. As shown by arrows in FIG. 2, the wind blown from the cooling device 11 in all directions flows along the top plate 3 of the case 3, so that the wind blown from the cooling device 11 also
It acts to cool. In FIG. 2,
In order to simplify the illustration, the cooling device 11 is only shown in its outline.

In the above example, the cooling device 11 that blows air in all directions is used, but the cooling device may have any structure that blows air in at least one direction.

Further, in the above example, the cooling device 11 provided with the heat sink 13 having a contact area of about half the area of the top plate 3a of the case 3 was used, but as shown in FIG. Alternatively, a heat sink 13 ′ having an elongated shape such that the heat sink 13 ′ faces almost entirely may be used. When using such an elongated heat sink 13 ′,
The shape of the heat sink 13 ′ and the shape of the housing of the blower are determined so that the wind outlets are formed only on both sides in the longitudinal direction of the heat sink 13, and the impeller heat sink 13 is located substantially at the center in the longitudinal direction. It is preferable to do so. If a cooling device having such an elongated heat sink 13 ′ is used, the top plate 3 a of the case 3 can be entirely cooled, so that the cooling performance can be maximized.

In the above example, the heat sink 13 of the cooling device 11 is attached to the case 3 by using a double-sided tape. However, if a fixture that can press and fix the cooling device 11 against the case 3 is used. , Heat sink 13
Base 13a can be directly attached to the case 3. If such a fixture is used, the case 3
A locked portion for locking the locking portion of the fixture may be provided on the side.

[0024]

According to the present invention, since the temperature inside the case can be lowered by using the cooling device, a data write error or a data read error caused by a rise in the temperature inside the case can be prevented. In addition to this, there is an advantage that the motor can be rotated at a predetermined maximum rotation speed.

[Brief description of the drawings]

FIG. 1 is a front view of an example of an embodiment in which a recording medium rotary storage device of the present invention is applied to a hard disk used in a microcomputer.

FIG. 2 is a diagram for explaining a positional relationship and a size between the cooling device of the example in FIG. 1 and a hard disk case;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 hard disk (recording medium rotary storage device) 3 case 5 recording medium 7 motor 9 data writing and reading device 11 cooling device 13, 13 'heat sink 15 blower

Claims (5)

[Claims] A motor for rotating a disk-shaped recording medium, and a data writing and reading device for writing data to the recording medium and reading data from the recording medium are built in a case. A cooling device for reducing the temperature inside the case by absorbing heat emitted from the case and positively radiating the heat on the surface of the case. A storage medium rotating type storage device characterized by the above-mentioned. 2. The cooling device according to claim 1, wherein the cooling device includes a heat sink having a plurality of radiating fins on a surface of a plate-shaped base, and a blower that flows air along the surfaces of the plurality of radiating fins of the heat sink and the surface of the base. The cooling device is attached to the case by attaching the back surface of the base of the heat sink to the surface of the case directly or indirectly through a heat transfer member. Item 2. A storage medium rotating type storage device according to item 1. 3. The air blower is attached to the front side of the base of the heat sink, and is configured to blow air toward the base and the plurality of radiating fins. 3. The storage medium rotating storage device according to claim 2, wherein the radiation fin is configured to guide the wind blown from the blower to four sides outside the base. 4. The storage device according to claim 1, wherein the motor is disposed inside the case so as to be fixed to a wall of the case to which the cooling device is attached. 5. The cooling device according to claim 1, wherein the cooling device is mounted on the surface of the case so as to face the motor disposed inside the case via a wall of the case. Recording medium rotary storage device.