JPH03207073A - Magnetic disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To increase rigidity between a base part and a cover part and to prevent thermal deformation by fixing the center shaft of a turning part provided with a head arm and the rotary center shaft of a magnetic disk to the base part and the cover part and providing another new fixing shaft. CONSTITUTION:In a space surrounded by the base part 1 and the cover part 4, the center shaft 6 of the turning part 14 for turning the head arm 5 having a magnetic head H and the center shaft 2 of the rotating magnetic disk D are fixed to the base 1 and the cover 4. Furthermore, another connecting and fixing member 21 is fixed to the base 1 and the cover 4 by a screw in the space surrounded by the base 1 and the cover 4. By thus connecting and fixing the base 1 and the cover 4 through the three fixing shafts 6, 2 and 21, the rigidity of the base 1 and the cover 4 is increased, the thermal deformation caused by temperature change is restrained and the tracking control is excellently performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic disk recording/reproducing device. (Prior Art) A magnetic recording/reproducing device using a magnetic recording medium (magnetic disk) and a floating magnetic head (hereinafter simply referred to as a magnetic head) is widely used as a storage device in various information processing devices. has been done.

The magnetic head driving unit W (actuator) for driving and displacing the magnetic head in the magnetic disk recording/reproducing apparatus described above so as to correctly position the magnetic head on successive recording traces (tracks) on the magnetic disk under tracking control is a direct-acting type. Two types of motors have been known: one constructed using a voice coil motor, and one constructed using a rotary voice coil motor.
In recent years, with the demand for compact magnetic disk recording and reproducing devices that can perform high-density recording and reproducing, we have developed a compact magnetic disk recording and reproducing device that can achieve high-density recording and reproducing with improved vibration resistance. For example, as a snow cover,
As disclosed in Japanese Utility Model Publication No. 0-56967, Japanese Utility Model Application Publication No. 62-45768, and other publications, a rotary voice coil motor of a magnetic head drive unit I (actuator) in magnetic disk recording/reproducing equipment is disclosed. The shaft, which is the center of rotation, is fixed at both ends to the base and cover of a magnetic disk recording/reproducing device to increase the rigidity of the device, or to improve the device's vibration resistance and prevent thermal deformation. In order to increase the rigidity of the device for the purpose of reducing the influence, for example, as disclosed in Japanese Patent Laid-Open No. 63-124286, a rotating type of magnetic head drive device (actuator) in a magnetic disk recording/reproducing device is proposed. The shaft serving as the center of rotation of the voice coil motor is fixed at both ends to the base portion and cover portion of the magnetic disk recording/reproducing device, and the shaft is the center of rotation of the spindle motor for driving and rotating the magnetic disk. A magnetic disk recording/reproducing device has been proposed in which a shaft is attached at both ends to the base portion and cover portion. FIG. 4 is a perspective view showing the general structure of a magnetic disk recording/reproducing device that uses a rotary voice coil motor to drive a magnetic head for displacement, and FIG. 5 is a plan view of the same. , FIG. 6 is a vertical sectional side view of the same, in which 1 is a base portion, 2 is a fixed shaft serving as the center of rotation of the spindle motor, and 3 is rotatably supported by a bearing attached to the above-mentioned fixed @2. The rotating hubs D, D, . . . of the spindle motor shown in FIG.
is the cover part, ACTr is the rotating voice coil motor,
H is a magnetic head, 5 is a head arm, 6 is a fixed shaft that is the center of rotation of the rotating voice coil motor ACTr, 7 is an upper magnetic path, 8 is a center magnetic path, 9 is a lower magnetic path, 10.
11 is a permanent magnet, 12 is a moving coil, l3 is a coil frame made of non-magnetic metal, 14 is a rotating part, and 15 is a fixed part (
16.16 is a screw for fixing the fixed part (magnetic path component) of the rotating voice coil motor to the base part 1; 17 is a fixed shaft 6; 18 is a fixed ring 6.
19 is a screw that fixes the fixing member 2, which is the center of rotation of the spindle motor, to the base part 1, and 20 is a screw that fixes the fixing member 2, which is the center of rotation of the spindle motor, to the base part 1.
This is a screw that secures l2 to the cover part 4. Also, a=d
is a screw for connecting and fixing the base part and the cover part 4.

In the rotating voice coil motor ACTr, the fixed shaft 6 is fixed to the base part 1 and the cover part 4 by screws 17 and 18, as shown in FIG. A movable part 14 is rotatably supported via a bearing (not shown). The rotating part l4 has a predetermined number of head arms 5, 5...
are attached at predetermined intervals, and a coil frame 13 is integrally constructed in the rotating part 14, and the end of the moving coil 12 is attached to the coil frame 13, for example by adhesive It is fixed by an agent. A central magnetic path 8 is inserted through the above-mentioned moving coil 12 so as to be in a non-contact state with the moving coil 12, and one side of the moving coil 12 is provided with a magnetic field generated by the permanent magnet 10. Center magnetic path 8 → Upper magnetic path 7 → Permanent magnet 10
The magnetic flux that circulates in the path → is interlinked, and the moving coil 1
The magnetic flux generated by the permanent magnet 11 and circulating in the path of permanent magnet l1 → central magnetic path 8 → lower magnetic path 9 → permanent magnet 11 → is linked to the other side of 2, so that
When a current is supplied to the movable coil 12, the movable coil 12 is displaced in a direction and a displacement amount depending on the polarity and magnitude of the current supplied to it, thereby causing a rotation that is integrated with the movable coil 12 to be displaced. The moving part 14 is the above-mentioned moving coil 12
It rotates in response to the displacement of . Therefore, by determining the polarity and magnitude of the current supplied to the above-mentioned moving coil 12, the magnetic heads H, H...
・can be positioned on predetermined tracks on the magnetic disks D, D, . . . . Now, magnetic disk recording and reproducing devices that are required to perform high-density recording and reproducing operations can be assembled and manufactured in a clean room, and external dust can enter the inside of the device during use. It is well known that products shipped are sealed with a base part 1 and a cover part 4 to prevent any damage. Aluminum die-cast products are usually used because of their advantages such as weight, ease of processing, cost, and no need for anti-rust coating. On the other hand, in a magnetic disk recording/reproducing device having the above-mentioned configuration, the main components thereof are driven and displaced by electromagnetic force, and therefore each component has the above-mentioned base part. Since the magnetic material iron, which has a coefficient of thermal expansion different from that of the aluminum used in the construction of the parts 1 and 4, is used, magnetic disk recording may occur due to changes in ambient temperature or other causes. The amount of distortion due to temperature change between the base part 1 and the cover part 4 in the playback device, and the above-mentioned base part 1 and cover part 4
The amount of strain caused by temperature changes in the steel components connected to the steel components differs from each other. As is well known, the presence of the thermal deformation described above deteriorates the tracking state, and therefore, as in the magnetic disk recording/reproducing apparatus described with reference to FIGS. 4 to 6, the magnetic head drive device It (actuator) Both ends of the fixed shaft 6, which is the center of rotation of the rotary voice coil motor, are fixed to the base part 1 and the cover part 4, which are connected to the magnetic disk recording and reproducing apparatus, and
Both ends of a fixed shaft 2, which is the rotation center of a spindle motor for driving and rotating a magnetic disk, are fixed to the base part 1 and cover part 4, thereby increasing the rigidity of the device and making it difficult for thermal off-track to occur. As mentioned above, attempts to make this happen are well known. (Problem to be Solved by the Invention) However, as in the magnetic disk recording/reproducing device described with reference to FIGS. 4 to 6, the rotating voice coil of the magnetic head drive device (actuator) A fixing member 6 serving as the center of rotation of the motor and a fixing member 2 serving as the center of rotation of the spindle motor for driving and rotating the magnetic disk are fixed at both ends to the base portion 1 and the cover portion 4. Even if the rigidity of the snow covering is increased, the magnitude of the stiffness centered on the diagonal line position indicated by B − + C in Fig. 5, and the stiffness indicated by b - + d in Fig. 5 will be It became clear that the amount of rigidity around the diagonal position of the housing was still insufficient, and that thermal off-track occurred due to temperature changes, and a solution to this problem was sought. (Means for Solving Problem W) The present invention provides a rotating type device that performs rotational movements around a fixed rotational center axis that is fixed at one end to a base portion and a cover portion. A rotating magnetic drive device having a predetermined number of head arms in which a predetermined number of magnetic heads are attached to a rotating part rotated by a voice coil motor, and one end of each of the base part and cover part. In a magnetic disk recording and reproducing device, the magnetic disk recording and reproducing device is equipped with a rotation drive device that rotates the magnetic disk by means of a spindle motor that rotates around a fixed rotation center shaft to which the base portion is fixed. In addition to the two fixed shafts, the fixed rotational center shaft and the fixed rotational center shaft, one new fixed shaft is provided in the space surrounded by the cover part. The present invention provides a magnetic disk recording/reproducing device in which each end of a fixed shaft is fixed to the base portion and the cover portion.

(Function) Each end of the fixed shaft 6, which is the center of rotation in a rotary magnetic drive device having a predetermined number of head arms 5 with a predetermined number of magnetic heads attached to the rotating part 14, and a spindle motor Each one end of a fixed rotation center shaft 2 in a rotary drive device for driving and rotating a magnetic disk is fixed to the base part 1 and the cover part 4, and is surrounded by the base part 1 and the cover part 4. In addition to the two fixed shafts, the fixed shaft 6 and the fixed shaft 2, one new fixed shaft 21 is provided in the space where the fixed shaft 2 is located, and one end of each of the new fixed shafts is connected to the base part 1 described above. By fixing it to the base part 1 and the cover part 4, the rigidity is significantly increased, and due to the difference in the amount of strain that occurs in the iron components connected to the base part 1 and the cover part 4 due to temperature changes. Thermal deformation between the two is suppressed, and therefore, in the magnetic disk recording and reproducing apparatus of the present invention, it is possible to greatly reduce thermal off-track that occurs in conventional magnetic disk recording and reproducing devices. can. (Embodiment) Hereinafter, specific contents of the magnetic disk recording/reproducing apparatus of the present invention will be explained in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a schematic configuration of a magnetic disk recording/reproducing apparatus of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a longitudinal sectional side view of the same. In FIGS. 1 to 3, the structural parts corresponding to the structural parts of the conventional apparatus explained with reference to FIGS. 4 to 6 are shown in the drawings used in FIGS. 4 to 6. The same reference numerals as those in the drawings are given, and in the figure, 1 is a base part, 2 is a fixed support that is the center of rotation of the spindle motor, and 3 is rotatably supported by a receiver attached to the above-mentioned fixed part 2. The rotating hub of the spindle motor, D, D・
... is a magnetic disk attached to the rotation hub 3 of the spindle motor at a predetermined interval, 4 is a cover part, A
CTr is a rotary voice coil motor, H is a magnetic head, 5 is a head arm, 6 is a fixed shaft that is the center of rotation of the rotary voice coil motor ACTr, 7 is an upper magnetic path, 8 is a center all. 9 is the lower magnetic path, 10 and 11 are permanent magnets,
12 is a moving coil, 13 is a coil frame made of non-magnetic metal, 14 is a rotating part, and 15 is a fixed part (a component of the magnetic path).
16. 16 is a screw that fixes the fixed part (magnetic path component) of the above-mentioned rotary voice coil motor to the base part l, and 17 fixes the fixed shaft 6 to the base part. 18 is a screw for fixing the fixed shaft 6 to the cover part 4; 19 is a screw for fixing the fixed shaft 2, which is the center of rotation of the spindle motor, to the base; 20 is a fixed shaft 2, which is the center of rotation of the spindle motor. Screws 8 to d are for fixing the base part 1 and the cover part 4 together. Further, reference numeral 21 denotes a connecting fixing member 22, 23 for connecting and fixing the base part l and the cover part 4.
is a screw. In the magnetic disk recording/reproducing device of the present invention shown in FIGS. 1 to 3, a connecting fixing member 2l, a screw 22, Each component except 23 and its operation are as follows:
Since the configuration and operation are the same as those of the conventional magnetic disk recording and reproducing apparatus described with reference to FIGS. 4 to 6, detailed description thereof will be omitted here.

In the magnetic disk recording/reproducing apparatus of the present invention shown in FIGS. 1 to 3, a space surrounded by a base portion l and a cover portion 4 is provided with a fixed shaft 6 serving as a rotation center. A predetermined number of magnetic heads H are mounted on a rotating part l4 that is rotated by a rotating voice coil motor that performs rotational movements.
The magnetic disk D is driven by a rotary magnetic drive device having a predetermined number of head arms 5 to which a head arm 5 is attached, and a spindle motor that rotates around the fixed support 2.
A rotary drive device that drives and rotates the fixed shaft 6 described above.
and one end of each of the above-mentioned fixed supports 2 are fixed to the above-mentioned base part 1 and cover part 4, and also, by the above-mentioned base part 1 and cover part 4, The above-mentioned fixed shaft 6 is located in the enclosed space.
In addition to the two fixing members of the fixed shaft 2 and the fixing shaft 2, one new connecting fixing member 21 is fixed at one end to the base part 1 and the cover part 4 with screws 22 and 23. It is set up as follows.

Therefore, since the base part 1 and the cover part 4 are firmly connected and fixed by the three fixed rings 6, 2, and 21 described above, the base part 1 and the cover part 4 exhibit great rigidity. Because it is made into a solid material, thermal deformation due to temperature changes is effectively suppressed. The three fixing shafts 6, 2.21 used for connecting and fixing the base part 1 and the cover part 4 described above are arranged in such a way that they are located at the vertices of an equilateral triangle.
If it is made of m41, great rigidity can be obtained. Further, it is preferable that the mounting opening of the above-mentioned connecting fixing member 21 is set so as to be separated from the part where the base part and the cover part 4 are connected by the screws a to d. (Effects of the Invention) As is clear from the above detailed explanation, the present invention provides a rotary magnetic drive having a predetermined number of head arms 5 in which a predetermined number of magnetic heads are attached to the rotary part 14. One end of the fixed shaft 6, which is the center of rotation in the device, and one end of the fixed shaft 2, which is the center of rotation in a rotary drive device that drives and rotates a magnetic disk by a spindle motor, are connected to the base portion 1 and the cover. 4, and in addition to the two fixed shafts 6 and 2 mentioned above, one new fixed shaft is installed in the space surrounded by the base part 1 and the cover part 4. By providing a fixed shaft 21 and fixing one end of each of the new fixed shafts to the base part 1 and the cover part 4, the rigidity is significantly increased, and the above-mentioned base can be easily fixed due to temperature changes. Part 1
Thermal deformation between the two due to the difference in the amount of strain occurring in the iron structural part connected to the cover part 4 is suppressed. Therefore, in the magnetic disk recording/reproducing apparatus of the present invention, thermal deformation in the magnetic disk is suppressed even due to temperature changes. Good tracking control operation is performed without causing off-track, and the above-mentioned conventional problems can be satisfactorily solved by the magnetic disk recording/reproducing apparatus of the present invention.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a magnetic disk recording/reproducing apparatus of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a longitudinal side view of the same, and FIG. 4 is a schematic diagram of a conventional magnetic disk recording/reproducing apparatus. FIG. 5 is a perspective view showing the configuration, FIG. 5 is a plan view of the same, and FIG. 6 is a vertical sectional side view of the same. DESCRIPTION OF SYMBOLS 1...Base part, 2...Fixed shaft serving as the rotation center of the spindle motor, 3...Rotating hub of the spindle motor, 4...Cover part, ACTr.
... Rotating voice coil motor, H... Magnetic head, D... Magnetic disk, 5... Head arm, 6...
. . . Fixed support serving as the center of rotation of the rotating voice coil motor ACTr, 7 . . . Upper magnetic path, 8 . . . Center magnetic path, 9
...lower magnetic path, engineering 0,11...permanent magnet, 12...
- Moving coil, work 3... Coil frame made of non-magnetic metal, 14... Rotating part, 15... Code indicating fixed part (structure or member of Ik path), 16-20, 22 ,23
screw. a-d... Screws for coupling and fixing the base part 1 and the cover part 4, 21... The base part 1 and the cover part 4
a connecting fixing member that connects and fixes the

Claims (1)

[Claims] A rotating part that is rotated by a rotating voice coil motor that rotates around a fixed rotation center shaft that is fixed at one end to the base part and the cover part. A rotary magnetic drive device having a predetermined number of head arms to which several magnetic heads are attached, and a fixed rotation center shaft having one end fixed to the base portion and the cover portion. In a magnetic disk recording and reproducing device, the magnetic disk recording and reproducing device is equipped with a rotation drive device that drives and rotates a magnetic disk by a spindle motor that performs a rotation operation.
In addition to the two fixed shafts, the fixed rotational center axis and the fixed rotational center axis, one new fixed shaft is provided in the space surrounded by the base part and the cover part. ,
A magnetic disk recording/reproducing device in which one end of each of the above-mentioned new fixed shafts is fixed to the above-mentioned base part and cover part.