JP3726004B2 - Magnetic disk unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic disk apparatus, and more particularly to a magnetic disk apparatus having a control IC in a magnetic head support mechanism.
[0002]
[Prior art]
As a conventional technique, in Japanese Patent Laid-Open No. 11-195215, for the purpose of cooling an IC for a magnetic head, the IC is disposed facing the disk surface, and the distance between the disk and the IC is set to 1 mm or less. It is disclosed.
[0003]
[Problems to be solved by the invention]
In order to install the head IC on the disk-facing surface, the head IC and the disk come into contact with each other due to restrictions on the wiring (FPC) between the head IC and the magnetic head, or external impact, and the disk is damaged. There is a possibility that a problem such as a risk of being difficult to perform an overview check (electrical check) due to the danger that the joint portion of the head IC faces downward may occur.
[0004]
An object of the present invention is to provide a means for cooling an IC without providing an IC chip on the disk facing surface (without facing the disk).
[0005]
[Means for Solving the Problems]
The purpose is to provide a head control IC on the opposite surface of the magnetic head support mechanism to the disk surface, and a portion of the case cover that faces the IC or a portion of the case base that faces the IC. This can be achieved by providing an air guide mechanism comprising a protrusion for reducing the gap with the IC.
Another object of the present invention is to mount a signal amplifier for recording and reproducing information with a magnetic head on a magnetic head support mechanism, and to guide air to the IC with an air guide plate provided in the upper part of the IC without contact with the IC This can be achieved by configuring the guide mechanism and reducing the distance between the IC and the air guide plate in accordance with the disk rotation direction.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. FIG. 11 shows an overall view of the apparatus. As shown in FIG. 11 (1), the magnetic disk device has a sealed structure formed by a cover 2 in which a magnetic disk, a magnetic head, and the like are housed in a base 1 in the shape of a launch box. As shown in FIG. 11 (2), the base 1 includes a magnetic disk 4 stacked on a spindle 3, a magnetic head support mechanism 5 that supports a magnetic head (not shown), and a magnetic head support mechanism 5. A guide arm 6 to be connected, and a positioning mechanism 9 including a pivot bearing 7 and a voice coil motor 8 are included.
[0007]
FIG. 1 shows a detailed configuration of the magnetic head support mechanism 5. A slider 4 on which a magnetic head (not shown) is mounted is supported by a flexure 11, and the flexure 11 is joined to a load beam 18 including a flat portion 12, a flange 13 portion, and a spring portion 14. The other end of the load beam 18 is an IC mounting base on which a guide arm joint 16 joined to the guide arm 6 and a signal amplifier (hereinafter referred to as IC) 30 are attached. The magnetic head support mechanism 5 is a generic term for the load beam 18, the flake shear 11, the guide arm joint 16, and the IC mounting base 17. The magnetic head support mechanism 5 is attached to the guide arm 6 by attaching a protruding mounter (not shown) provided at the guide arm joint 16 of the load beam 18 and a mount hole 61 of the guide arm by caulking. It is done.
[0008]
In this embodiment, the load beam 18, the guide arm joint portion 16, and the IC mounting base are formed by shaping a single plate. The spring portion 14 is provided with a window 15 to optimize the spring rigidity. IC 30 is connected to wiring 31 extending from the magnetic head. The wiring 31 passes from the magnetic head through the flexure 11 and reaches the IC 30. The IC 30 is installed such that the joint with the wiring is on the disk surface side. By making the joint between the IC 30 and the wiring on the disk side, it becomes easy to perform an overview check of the joint from the top of the IC 30 and an electrical check performed by applying a probe. The magnetic disk 4 rotates in the direction of arrow 17 and the slider 10 floats on the rotating disk.
[0009]
FIG. 2 shows a cross section of the IC 30 and the cover 2 as seen from a plane parallel to the plane of the magnetic disk 4. The IC 30 is mounted on the IC mounting base 17. The opposite side of the joint portion between the IC 30 and the wiring 31 faces the cover 2. The cover 2 at a position facing the IC 30 is provided with a recess 200 (protrusion projecting toward the disk surface), and the flow path height H, which is the distance from the surface of the disk 4 to the cover, is set in the IC. It is smaller at the opposite position. And if it goes downstream from the position of IC30, it will return to the original height again.
[0010]
Flow path height H> Flow path height HI at the IC 30 mounting position (1)
If the flow path height is low at the position where the IC 30 is mounted, the flow rate Q that rotates with the disk rotation is constant. At the position of the IC where the flow path height is low, the flow path height is inversely proportional to the small cross-sectional area S. As a result, the flow velocity V increases.
[0011]
Flow velocity V <flow velocity Vi around IC30 (2)
As described above, when the depression 200 is provided in the upper cover of the IC 30 and the cover 2 is brought close to the IC 30, the flow velocity of the air flow 402 is increased compared to the conventional cover 2 without the depression 200. It becomes possible to make it. The cooling effect of the IC 30 is enhanced by increasing the flow velocity around the IC 30. As a result, even if the power (power consumption) during operation of the IC 30 is increased, the temperature rise of the IC 30 itself can be kept low. Therefore, even if a large amount of information is recorded / reproduced (even if power consumption increases), it becomes possible to ensure reliability (because the temperature rise of the IC 30 can be kept low, so that the IC 30 will not malfunction). ).
[0012]
Further, the flow path height Ho from the disk surface on the rear side (disk rotation direction) to the cover 2 from the IC 30 is the same height H (= Ho) as that on the front side. This is because if the air flow rate is increased, the fluid excitation force on the load beam 18 increases, so that the flow passage cross-sectional area S is increased behind the IC 30 to reduce the flow rate. From the standpoint of cooling the IC 30, there is no need to return the channel height to the base behind the IC 30. In the above description, the distance H from the surface of the magnetic disk 4 has been described. However, it is obvious that the distance from the IC 30 to the cover 2 is the same as shortening.
[0013]
In FIG. 3, the position and magnitude | size of the hollow 200 provided in the said cover 2 are shown. FIG. 3 shows the IC 30, the magnetic head support mechanism 5, the magnetic disk 4, and the guide arm 6 as seen through from the cover 2 side. An arrow 201 indicates a locus when the slider 10 moves from the inner periphery to the outer periphery of the magnetic disk 4. Here, the air flow velocity acceleration groove 200 provided in the cover 2 is provided along the locus 201 of the IC 30 (so as to cover the locus 201). Therefore, the IC 30 can be effectively cooled regardless of the radial position of the magnetic head (slider 10). In this embodiment, the entire locus 201 of the IC 30 is covered. Although the depression 200 is provided, it is clear that a cooling effect can be expected even if it is provided in a part thereof. It may be partially provided at the inner peripheral position of the disk or at a place where the IC 30 comes out of the disk and the flow velocity around the IC 30 decreases.
[0014]
As described above, even if the power consumption of the IC 30 increases due to high-speed and large-capacity information transfer by providing an air guide mechanism for guiding the air around the IC 30 and improving the flow velocity of the air flow, Temperature rise can be suppressed. Therefore, it is possible to record / reproduce high-speed and large-capacity information while ensuring reliability.
[0015]
A second embodiment of the present invention will be described with reference to FIG. In this embodiment, the base protrusion 100 is provided on the base 1 facing the IC 30 mounted on the magnetic head support mechanism 5 to reduce the flow path height Hi at the position of the IC 30. By reducing the flow path height H, the flow velocity around the IC 30 is increased, and the cooling effect of the IC 30 can be improved as in the first embodiment. Further, in this embodiment, since the base 1 is machined to provide the base protrusion 100, the height of the protrusion 100 can be easily managed, and a narrower flow path (flow path height Hi) can be realized. Can do. Even when the guide arm 6 is bent by an external impact, contact between the guide arm 6 or the IC 30 and the base 1 must be avoided. On the other hand, the smaller the Hi, the faster the flow velocity around the IC 30, so it is necessary to ensure Hi with high accuracy. From this point of view, there is an advantage of the second embodiment.
[0016]
A third embodiment of the present invention will be described with reference to FIGS. In this embodiment, as shown in FIG. 5, an IC 30 is provided on the flat portion 12 of the load beam 18. In this embodiment, as shown in FIG. 6A, magnetic head support mechanisms 5 are provided on both sides of the guide arm 6 (FIG. 5 shows one magnetic head support mechanism for convenience. ). As shown in FIG. 6A, the two magnetic head support mechanisms 5 inserted between the disks 4 face each other, so that the two ICs 30 face each other. Between the two ICs 30, an airfoil air guide plate 300 having an airfoil cross section as an air guide mechanism is provided.
[0017]
The airfoil type air guide plate 300 is vertically symmetric and has an airfoil shape. Therefore, the air flow rate is increased, and the air flow is not disturbed by the air guide plate 300. For this reason, the air flow accelerated by the airfoil type air guide plate is effective for cooling the IC 30. Further, since the air flow flows along the airfoil guide plate, the fluid vibration of the load beam is not increased. Note that providing a wedge-shaped air guide plate instead of the wing-type air guide plate 300 is effective from the viewpoint of cooling the IC 30. As described above, this embodiment also has the same effect as the first embodiment. In this embodiment, there is an effect in cooling the ICs of the two magnetic head support mechanisms inserted between the magnetic disks.
[0018]
The airfoil air guide plate 300 is attached to an L-shaped frame and inserted from the outer periphery to the inner periphery of the magnetic disk 4, for example, as shown in FIG. The L-shaped frame is attached to the base 1 with bolts or the like. The length L of the airfoil air guide plate 300 is substantially the same as the moving distance of the IC 30 and reaches the top of the IC 30 even when the magnetic head is at the inner peripheral position.
[0019]
A fourth embodiment of the present invention will be described with reference to FIGS. The flat portion 12 of the load beam in front of the IC 30 is cut out and an air intake window 400 is provided. A tongue-shaped air guide plate 401 is provided from the frame of the window 400 toward the surface of the magnetic disk 4. The tongue-shaped air guide plate 401 guides an air flow generated with the rotation of the magnetic disk 4 from the disk surface side to the IC 30 and supplies an IC cooling flow 402 for cooling the IC 30. Since the air flow is the fastest on the surface of the rotating disk, a high-speed air flow can be guided as the IC cooling flow 402 by the tongue-shaped air guide plate 401 as in this embodiment. Since this tongue-shaped air drafting plate is formed by press work like the flange 13, it is not necessary to add a new member. For this reason, the same effect as that of the first embodiment can be expected also in this embodiment. Furthermore, a high-speed air flow for IC cooling can be obtained without using a new member, which is excellent from the viewpoints of productivity and cooling efficiency.
[0020]
In this embodiment, the tongue-shaped air guide plate 401 is provided on the flat portion 12 of the load beam. However, the same effect can be obtained by providing a similar tongue-shaped air guide plate on the IC mounting base of the first embodiment. It is clear that Alternatively, the stiffness adjustment 15 of the spring portion may be used as the air intake window 400, and the tongue-shaped air guide mechanism 401 may be provided on this window. Thereby, it is not necessary to newly provide an air intake window, and the load beam can be downsized.
[0021]
A fifth embodiment of the present invention is shown in FIG. The difference between the present embodiment and the first embodiment is that the IC 30 is provided on the inner peripheral side of the guide arm 6. As shown in FIG. 9, the mounting base 17 for the IC 30 is provided on the inner peripheral side of the magnetic disk of the guide arm 6, and the IC 30 is mounted thereon. In this embodiment, the air flow 402 generated along with the disk rotation directly hits the IC 30. In the first embodiment, since the mounting base 17 for the IC 30 is provided on the outer peripheral side of the magnetic disk of the guide arm 7, the air flow 402 is blocked by the guide arm 6, and the IC 30 cannot be directly cooled. According to this embodiment, the IC 30 can be directly cooled by the air flow 402. For this reason, the IC 30 can be cooled more powerfully than in the first embodiment. Further, by providing the IC 30 on the inside, when the rotational speed of the magnetic disk is fast, the air flow speed associated therewith is fast. Therefore, even when there are a plurality of magnetic head support mechanisms, all the ICs 30 are strongly cooled. Things will be possible. For this reason, the recess 200 of the cover 2 provided in the first embodiment, the protrusion 100 provided on the base 1, and the airfoil air guide plate 300 provided between the disks may be unnecessary.
[0022]
A sixth embodiment of the present invention is shown in FIG. The difference between this embodiment and the third and fourth embodiments is that the two ICs 30 facing each other are provided in a staggered manner (changed in position) so as not to contact each other. As a result, the magnetic head support mechanism with the IC 30 can be inserted between the magnetic disks without contacting the two ICs even between the magnetic disks having a narrow interval between the magnetic disks. Further, the IC 30 can be cooled by providing the air intake window 400 as in the fourth embodiment. In this embodiment, since the IC 30 can be cooled even when the magnetic disk interval is narrow, a high-density mounting magnetic disk device can be realized. Also in this embodiment, the same effect as in the first embodiment can be expected.
[0023]
【The invention's effect】
According to the present invention, since the signal amplifier (IC) mounted on the magnetic head support mechanism can be effectively cooled by the air flow, it is possible to suppress the temperature rise due to the power consumption of the IC, while ensuring the reliability. High-speed and large-capacity information can be transferred.
[Brief description of the drawings]
1 is a cross-sectional view of a cover of a first embodiment; FIG. 3 is a front view of a cover of the first embodiment; and FIG. 4 is a cross-sectional view of a base of a second embodiment. 5 is a magnetic head support mechanism according to a third embodiment. FIG. 6 is a wing-type air guide plate according to a third embodiment. FIG. 7 is a magnetic head support mechanism according to a fourth embodiment. FIG. 9 is a magnetic head support mechanism according to a fifth embodiment. FIG. 10 is a magnetic head support mechanism according to a sixth embodiment. FIG. 11 is an overall view of the apparatus according to the first embodiment.
DESCRIPTION OF SYMBOLS 1 ... Base, 2 ... Cover, 4 ... Magnetic disk, 5 ... Magnetic head support mechanism, 6 ... Guide arm, 10 ... Slider, 17 ... Disk rotation direction, 30 ... Signal amplifier (IC), 300 ... Wing type air guide plate 400 ... Air intake window 402 ... Air flow.

Claims (3)

A magnetic disk for recording information, a rotating mechanism for rotating the magnetic disk, a magnetic head for recording information on the rotating magnetic disk, a slider mounted on the magnetic head, levitating on the rotating magnetic disk, and supporting the slider In a magnetic disk device comprising a magnetic head support mechanism for positioning and a positioning mechanism for positioning the magnetic head at a predetermined radial position,
Mounted on the opposite side to the side facing the signal amplification unit for recording and reproducing information by a magnetic head on a magnetic disk of the magnetic head supporting mechanism, wherein the signal amplifier and the opposing cover or base surface of the magnetic disk device The magnetic disk device is characterized in that the magnetic head protrudes toward the signal amplifier within a range in which the magnetic head moves from the inner periphery to the outer periphery of the magnetic disk. 2. The magnetic disk device according to claim 1, wherein a portion of the cover or the base that protrudes toward the signal amplifier constitutes an air guide mechanism for guiding air to the signal amplifier. apparatus. A magnetic disk for recording information, a rotating mechanism for rotating the magnetic disk, a magnetic head for recording information on the rotating magnetic disk, a slider mounted on the magnetic head, levitating on the rotating magnetic disk, and supporting the slider In a magnetic disk device comprising a magnetic head support mechanism for positioning and a positioning mechanism for positioning the magnetic head at a predetermined radial position,
A signal amplifier for recording and reproducing information with a magnetic head is mounted on the magnetic head support mechanism,
An air guide mechanism for guiding air to the signal amplifier with an air guide plate provided in non-contact with the signal amplifier at the top of the signal amplifier ;
Magnetic disk apparatus, wherein a distance between the air guide plate and the signal amplifier, and narrower as the disk rotational direction.

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