JP2738671B2 - Linear guide mechanism of magnetic disk device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly to a linear guide mechanism of a magnetic disk drive that moves a magnetic head linearly. 2. Description of the Related Art A carriage capable of linear movement is used for a linear access mechanism of a magnetic disk drive, for example. The linear access mechanism in this magnetic disk drive is required to have a positioning performance with an extremely small error. This is indispensable for increasing the density of the magnetic disk drive, and various carriage support structures have been considered for improving the performance. For example, as disclosed in U.S. Pat. No. 4,441,941, a carriage provided with a magnetic head is supported by a support roller provided on the carriage and a guide member disposed on the side of the carriage so as to move linearly. Further, JP-A-57-
As disclosed in Japanese Patent No. 40785, there is an apparatus in which two rollers in contact with a cylindrical rail are surely brought into contact with the rail by a preload spring. [Problems to be Solved by the Invention] The above-mentioned prior art improves the mechanical characteristics of the carriage in the direction perpendicular to the magnetic disk surface due to rocking or running disturbance at the time of driving or stationary, and improves the magnetic head of the magnetic head. Although the aim is to improve the positioning performance, no consideration is given to the occurrence of errors in reading and writing of information by the magnetic head due to thermal deformation caused by heat generation of the voice coil motor for linearly moving the carriage. . That is, in recent years, in order to improve the weight and workability of the magnetic disk device, the carriage and the fixing portion to which the support member of the carriage is attached are made of aluminum, while the support member is made of iron having good sliding resistance. Have been. With this configuration, when the heat generated by the voice coil motor is transmitted to the carriage and the fixed portion as described above, the carriage and the fixed portion have a large thermal expansion coefficient with respect to the support member. When expanded, the support member moves away from the guide surface of the guide member, creating a gap between the support member and the guide surface. Due to the generation of the gap, the carriage tilts with respect to the disk surface of the magnetic disk. In particular, a tilt in a direction perpendicular to the magnetic disk surface of the carriage (hereinafter referred to as pitching) causes a displacement between the data head and the servo head, causing an error in reading and writing of information, and significantly lowering its reliability. Let me. Further, in the carriage support mechanism disclosed in JP-A-57-40785, all of the rollers provided on either side of the rollers provided on both sides of the carriage are connected to the carriage via leaf springs. Supported.
In such a conventionally used structure, it is difficult to determine the position of the carriage with respect to the rail surface with high accuracy in a rotation direction about an axis passing through the center of gravity of the carriage and parallel to the movement direction of the carriage. Therefore, it is difficult to maintain good read / write characteristics of information due to a decrease in the accuracy of mounting the carriage, which may cause a reduction in reliability. The present invention has been made on the basis of the above-described matter, and suppresses the pitching of the carriage against thermal deformation of the carriage due to heat generated by the voice coil motor and the like, and provides a magnetic disk drive capable of mounting the carriage with high accuracy. It is an object to provide a linear guide mechanism. Means for Solving the Problems One aspect of the present invention is a magnetic head that reads and writes information on a disk surface of a rotating magnetic disk, a carriage provided with the magnetic head, and a roller provided on the carriage or a fixed portion. A linear guide for a magnetic disk drive, comprising: two guide surfaces disposed on both sides or both sides of the carriage for guiding the rollers on each side; and a carriage drive unit provided on the anti-magnetic head side of the carriage. In the mechanism, rollers for guiding one of the two sides to the guide surface are provided on the magnetic head side and the carriage drive unit side of the carriage or the fixed portion, and the rollers are respectively guided to the other two guide surfaces. So that it corresponds between a roller on the magnetic head side provided on the one guide surface side and a roller on the carriage drive unit side. A linear guide mechanism for a magnetic disk drive, wherein one of the rollers provided on a carriage or a fixed portion and guided by the two guide surfaces on the other side is supported via a spring. Another aspect of the present invention is a magnetic head that reads and writes information on a disk surface of a rotating magnetic disk, a carriage provided with the magnetic head, a roller provided on the carriage, and disposed on both sides of the carriage. Side of the linear guide mechanism of the magnetic disk drive, which has two guide surfaces for guiding the rollers to the side and a carriage driving unit provided on the anti-magnetic head side of the carriage.
Two rollers guided on one guide surface are provided on the magnetic head side and the carriage drive unit side of the carriage, and one roller guided on another guide surface on one side is positioned between the two rollers. Provided on the carriage,
Two rollers respectively guided on the other guide surface on the other side are provided on the magnetic head side and the carriage drive side of the carriage, and one roller guided on the other guide surface is provided between the two rollers. The linear guide mechanism of the magnetic disk drive, wherein the linear guide mechanism is provided on the carriage via a spring so as to be located at the position (1). [Operation] When the carriage and the fixed portion expand due to heat generated by a voice coil and the like constituting the carriage driving portion, a gap is generated between the roller and the guide surface. However, the roller and the guide surface supported via a spring are used. The carriage moves so as to remove the above-mentioned gap by the reaction force of the spring generated by the contact with the carriage. As a result, each roller comes into contact with the corresponding guide surface, and the carriage can be moved linearly, so that a reading / writing error due to thermal deformation can be prevented. Also, at the time of assembly, the positional relationship between the guide surface and the carriage can be accurately and easily determined by the five fixed rollers not supported by the spring, and the carriage can be mounted with high accuracy. [Embodiment] FIGS. 1 and 2 show an embodiment of the present invention. In these figures, 11 is a magnetic head, 12 is a guide arm for supporting the magnetic head 11, and 4 is a guide arm 12. A carriage to be fixed, 14 is a voice coil provided on the anti-magnetic head side of the carriage 4, 1 is a rail arranged on each side of the carriage 4, and 5 is a fixed portion for holding the rail 1. One rail 1 is provided on the carriage 4 described above.
Rollers 2 respectively guided on the upper guide surface and the lower guide surface are provided on the magnetic head side and the voice coil 14 side of the carriage 4 via rolling bearings.
The rollers 2, 2a guided on the upper guide surface and the lower guide surface of the other rail 1 are the rollers 2, 2 on the one rail 1 described above.
The roller 2a is provided on the carriage 4 via a rolling bearing so as to correspond to the interval between the two, and the roller 2a is elastically provided on the carriage 4 via a spring 3 for applying a preload. The above-described carriage 4 and the fixed portion 5 are used for weight reduction.
Made of aluminum. The above-mentioned rail 1 is made of steel in order to improve sliding resistance. Next, the operation of the above-described embodiment of the present invention will be described. The rollers 2, 2a provided on the carriage 4 come into contact with the rollers 2a by the elastic force of the springs 3 and the corresponding guide surfaces.
Due to the reaction force generated at this time, the carriage 4 is moved so that each roller 2 comes into contact with the corresponding guide surface. As a result, the carriage 4 can move linearly along the rail 1. When heat generated by a voice coil, a magnetic disk drive motor, and the like constituting the carriage drive unit is transmitted to the carriage 4 and the fixed unit 5, they expand,
In particular, thermal deformation occurs so that each of the rails 1 and 1 moves laterally. As a result, a gap is created between each roller 2, 2a and the corresponding guide surface, and this gap is formed by the reaction force of the spring 3 generated by the contact between the roller 2a and the corresponding guide surface. 4 moves in the directions of arrows A and B shown in FIG.
2a is brought into contact with the corresponding guide surface. As a result, the carriage 4 can linearly move along the rail 1 even if the above-described thermal deformation occurs, and an error in reading and writing of information by the magnetic head 11 can be prevented. FIG. 3 shows another embodiment of the present invention, in which the same reference numerals as in FIGS. 1 and 2 denote the same or corresponding parts. This embodiment uses one rail 1
The two rollers 2 contacting the upper guide surface of the
Are provided on the magnetic head 11 side and the voice coil 14 side via rolling bearings, and one roller 2 in contact with the lower guide surface of one of the rails 1 is rolled so as to be located between the two rollers 2 described above. Carriage 4 via bearing
2 and is in contact with the lower guide surface of the other rail 1
The two rollers 2 are provided on the magnetic head 11 side and the voice coil 14 side of the carriage 4 via rolling bearings, and one roller 2a in contact with the upper guide surface of the other rail 1 is provided between the two rollers described above. To be located
It is provided on the carriage 4 via a rolling bearing and a spring 3 for applying a preload. According to this embodiment, the carriage 4 can be accurately linearly moved in the same manner as in the above-described embodiment, and reading / writing errors by the magnetic head can be prevented. FIGS. 4 and 5 show still another embodiment of the present invention, in which the same reference numerals as those in FIGS. 1 and 2 denote the same or corresponding parts. In this embodiment, the rollers 2 and 2a are formed as conical rollers, the roller 2 guided on one rail 1 is formed as a roller of a winding type, and the roller 2a is in contact with the upper guide surface of the other rail. Rolling bearings and coil springs 21
And is provided on the carriage 4 so as to apply a preload to the outer ring of the rolling bearing through the shaft. According to this embodiment, the carriage 4 can be accurately linearly moved in the same manner as in the above-described embodiment, and reading / writing errors by the magnetic head can be prevented even with respect to thermal deformation. FIG. 6 shows another embodiment of the present invention, in which the same reference numerals as in FIG. 1 denote the same or corresponding parts. This embodiment has the same arrangement of rollers as the embodiment shown in FIG. 1, except that rollers 2, 2a are provided on the fixed portion 5 side, and guide surfaces 4a of these rollers 2, 2a are formed on the carriage 4. It was done. According to this embodiment, the carriage 4 can be accurately linearly moved in the same manner as in the above-described embodiment, so that a read / write error by the magnetic head can be prevented, and the rollers 2 and 2a are moved to the fixed portion 5 side. Because of the provision, the carriage 4 can be reduced in weight and its driving capacity can be reduced. Although a leaf spring and a coil spring are used as means for applying a preload to the roller 2a in the above-described embodiment, an attractive force or a repulsive force of a magnet may be used. [Effects of the Invention] According to the present invention, the positional relationship between the rail and the carriage during assembly can be accurately and easily determined by the five fixed rollers, so that the magnetic head is accurately positioned with respect to the magnetic disk. be able to. further,
Since a pre-load is applied to one roller, the roller and the rail come into close contact with each other due to the reaction force, and reading / writing errors of the magnetic head due to thermal deformation of the carriage and the fixed portion can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment of the mechanism of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a plan view showing still another embodiment of the mechanism of the present invention, FIG. 5 is a sectional view taken along the line V--V of FIG. 4, and FIG. It is a top view showing other examples of a mechanism. DESCRIPTION OF SYMBOLS 1 ... Rail, 2, 2a ... Roller, 3 ... Spring, 4 ... Carriage, 5 ... Fixed part, 11 ... Magnetic head.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Taro Sonoda               502 Kandachicho, Tsuchiura-shi Hitachi, Ltd.               Inside the factory machinery laboratory                (56) References JP-A-57-40785 (JP, A)                 JP-A-61-269267 (JP, A)                 JP-A-60-74162 (JP, A)                 JP-A-60-59577 (JP, A)                 Shokai Sho 59-42571 (JP, U)                 Shokai 57-80178 (JP, U)

Claims (1)

(57) [Claims] A magnetic head for reading and writing information on a disk surface of a rotating magnetic disk, a carriage in which the magnetic head is coupled via a support member, a roller provided in a fixed portion, and a guide for guiding the roller to both sides of the carriage. A linear guide mechanism for a magnetic disk drive, comprising: a carriage driving unit comprising a voice coil motor coupled to a side of the carriage opposite to the magnetic head, wherein the magnetic head, the carriage, and the carriage driving unit are provided. Are arranged so as to be substantially on the same straight line in the front-rear direction, and rollers respectively guided by two guide surfaces on one side of the respective sides are provided on the magnetic head side and the carriage drive side of the fixed portion. And a roller on the magnetic head side provided with rollers respectively guided on the two guide surfaces on the other side on the one guide surface side. And provided on the fixed portion so as to correspond to the substantially intermediate the rollers of the carriage driving part side, 2 of the other side
A linear guide mechanism for a magnetic disk drive, wherein one of the rollers guided on one of the guide surfaces is supported via a spring.