JPS6260170A - Disk driving device - Google Patents

Abstract

PURPOSE:To improve the azimuth accuracy without performing the azimuth adjustment after a disk driver is set by abutting a contact a guiding means on the cylindrical side face of the bearing part of a drive motor for recording medium and regulating the position of the disk driver directly. CONSTITUTION:A stage part 10b is formed with the prescribed height h5 from a reference level F of a motor 10 at the bearing part 10a of the motor 10. At the same time, a cylinder part 10c centering the rotary center of the motor 10 is vertically formed to the disk rotary face. A guide bar 21 is attached at the corner part including both parts 10b and 10c by pushing. Thus the height h5 is prescribed for an upper surface E against the level F. While the horizontal position is prescribed by the radius of the part 10c against the rotary center of the motor 10. This eliminates the azimuth deviation and therefore omits the azimuth adjustment after a disk driver is set. Then the production is simplified for the disk driver.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a disk drive device for recording and reproducing information by driving a magnetic recording medium formed in the shape of a disk. The present invention relates to a disk drive device with improved performance.

[Background of the invention]

In disk drive devices that record and reproduce information on disk-shaped information recording media, such as magnetic recording media (hereinafter referred to as disks), the size of disk drive devices has been reduced as the diameter of disks has become smaller. and the density of information is increasing. As the density of information increases, the accuracy of each mechanism for reading and writing this information is required to be improved. In particular, this is closely related to the transportation accuracy and positional accuracy of the carriage.

A conventional mechanism related to transporting the carriage is shown in FIGS. 4 to 8. FIG. 4 is a plan view showing the relationship between the housing, the guide rod, and the stepping motor, and FIG. 5 is the main part of FIG. 4. FIG. 6 is a cross-sectional view, FIG. 6 is a plan view of the housing, FIG. 7 is an explanatory view showing how to attach the guide rod, and FIG. 8 is a conceptual diagram for explaining the support structure of the guide rod.

In this conventional example, as shown in FIG. 4, a housing 2 formed separately from a frame (not shown) includes a motor lO having a turntable 9 on its upper surface, and a carriage 1.
A stepping motor 13 rotates a screw shaft 20 formed with a thread groove 20a for transferring the
- An example is a carriage 12 that engages with the screw 1JI20a and slides on the guide rod 21 with the other side supported by the guide keyaki 21, and a disk of a magnetic helad 19 provided at the tip of the carriage 12. Detects the 0 trunk position of 0
A track sensor 22 is also provided. Carriage 1
In one example of 2, the retainer 23 that engages with the screw fn20a of the screw shaft 20 has a pointed end 23b that is on the distal end side of the temporary spring 23a and directly engages with the screw groove 20a, and a pointed end 23b that is located on the tip side of the temporary spring 23a and directly engages with the screw groove 20a, The guide rod 21 defines the height of the carriage 12 together with the guide rod 21. A transport mechanism 14 for the carriage 12 is formed by the carriage 12 and a stepping motor 13 having a screw shaft 20 for driving the carriage.

The configuration of the housing 2 and the transfer mechanism 14 will be explained in more detail.

In FIG. 6, the housing 2 includes a turntable mounting hole 16 into which a turntable 9 on which a disk (not shown) is placed is rotatably and loosely fitted, a carriage accommodating portion 17 in which a carriage 12 can move linearly and reciprocally, and a carriage. 12
The stepping motor attachment part 18 to which the stepping motor 13 for transferring the magnetic head is attached, and the attachment part 22a of the 0-track sensor 22 which detects the 0-track position of the magnetic head 19 provided at the tip of the carriage 12, are respectively shaped in a groove-like shape or a groove-like shape. is formed. In addition, the carriage accommodating portion 17 and the stepping motor mounting portion 18 of the housing 2
The outer peripheral wall 2a has a mounting groove 2b in which the guide rod 21 is mounted, and both bearing portions 13a of the stepping motor 13.
Attachments 1J12c and 2d to which the stepping motor 13b is attached, and a groove 2θ into which a screw 13c for fixing the stepping motor 13 is inserted are formed. These mounting grooves 2b.

The grooves 2c, 2d and the grooves 2e are formed by performing secondary processing on a block formed by die-casting an aluminum alloy, and are formed with high precision by cutting to a predetermined depth from the reference surface. This machining can be done with high precision by setting the housing block on the workbench and cutting the groove from the top of the housing block.
As shown in the partial side view of the seventh cabinet, if the side surface of the guide rod 21 is pressed against the lower surface and side surface of the guide groove 2b by the elastic thin plate 35, the position of the guide rod 21 is regulated. There is no need to adjust the height of both ends of the rod 21. In this conventional example, both ends of the guide rod 21 and the bearing portion 13h of the screw shaft 20 on the side where the thread groove 20a is formed are attached by the method shown in FIG.

In this conventional example, the mounting grooves 2b of the guide rod 21 can be machined with the same cutting depth in one step, so the mounting grooves 2b can be formed at the same depth with respect to the reference surface, resulting in a highly accurate guide. The height of the rod 21 (with respect to the disk) can be obtained, but if greater accuracy is pursued, the accumulation of dimensional errors during machining becomes a problem.

That is, as shown in the conceptual diagram when the guide rod 21 is attached to the housing 2 in FIG. It is defined by the dimensional tolerance of the height hl of the upper surface B of the turntable 9 with respect to the height hl. The error in the height direction of the guide rod 21 is defined by the dimensional tolerance of the height hl of the mounting surface C (lower surface of the mounting groove 2b) with respect to the reference surface A.
The error in the height direction is defined by the dimensional tolerance of the height from the axis of the guide rod 21 to the sliding surface of the magnetic heald 19.

By the way, regarding the position of the magnetic head 19, in addition to the height with respect to the disk, there is also the issue of azimuth.Azimuth is determined by two factors: the horizontal mounting angle of the magnetic head 19 with respect to the carriage 12, and the transport angle of the carriage 12 with respect to the disk. The transport angle of the carriage 12 is determined by the inclination angle of the guide rod 21 with respect to the center of rotation of the disk of the guide means of the carriage 12, that is, the guide rod 21. The center angle of the guide rod 21 is further determined by the positional relationship of the side walls 2'' of the two mounting grooves 2b to which the guide rods 21 are attached, and the surface accuracy.
Even if the mounting angle of the magnetic head 19 is defined with sufficient accuracy, if the position of the mounting groove 2b and the surface accuracy of the side wall 2r are not sufficiently defined, the guide rod 21 may be attached to the housing 2.
When the carriage 12 is assembled via the dimensional tolerance regarding the attachment of the magnetic helad 19 to the carriage L2,
The dimensional tolerance of the mounting groove 2b formed in the housing 2, the dimensional tolerance of the bearing portion for inserting the guide rod 21 of the carriage 12, the dimensional tolerance of the diameter of the guide rod 21, etc. accumulate, and the prescribed azimuth is not obtained. was there. In other words, even if the individual parts are formed with sufficient precision, when each part is assembled, the dimensional tolerances may accumulate, resulting in an insufficient total precision, and the resulting azimuth deviation is a problem. It became.

This phenomenon is particularly related to the machining accuracy of the mounting groove 2b of the guide bar 21 formed on the housing 2, but even if the machining accuracy of the mounting 1112b is maintained, the secondary machining of the housing 2 cannot be performed with a single blade. Since this cannot be done in one step, it was considered extremely difficult to eliminate the above-mentioned deviation caused by the housing 2 side.

[Purpose of the invention]

This invention has been made in view of the above-mentioned circumstances of the prior art, and its purpose is to provide a disk drive device that eliminates the azimuth deviation caused by the machining accuracy of the housing and eliminates the need for azimuth adjustment. be.

[Summary of the invention]

In accordance with the above object, the present invention includes a motor for rotationally driving a disk, a carriage provided with a head, and a transport means for transporting the carriage in the radial direction of the disk along a guide means. In a disk drive device for recording and reproducing information, the side surface of the bearing portion of the motor is formed into a cylindrical shape, and a guide rod serving as a guide means, for example, is brought into contact with this side surface to set the position of the guide rod on the motor. It is characterized by the structure in which the housing element is directly defined and the housing element is eliminated when positioning the carriage in the direction parallel to the disk.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the relationship among the housing, guide bar, motor, stepping motor, etc. of a disk drive device according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram showing the supporting state of the guide rod of the present invention. It is. In the following description, components that are the same as or can be considered to be the same as those of the conventional example are given the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, a notch 40 is formed at a part of the turntable mounting hole 16 of the housing 2, that is, at the inner edge of the turntable mounting hole 16 in FIG. , the notch 4
0, a part of the bearing portion LOa of the motor 10 is exposed. On the other hand, a stepped portion 10b is formed on the outer peripheral portion of the bearing portion 10a of the motor 10 in parallel to the rotational direction of the turntable 9, and the turntable 9
The stepped portion 1 is adjusted such that the height of the upper surface B of the step portion 1 becomes a predetermined height h4.
0b is finished. At this time, a small-diameter cylindrical portion 10C following the stepped portion 10b is formed perpendicular to the stepped portion IQb, that is, in a cylindrical shape centered on the rotation center of the disk, and the stepped portion 10b and the cylindrical portion 10c are It is just exposed from the notch 40. Then, one end of the guide rod 21 that guides the carriage 12 is extended to the notch 40, placed on the stepped portion lOb, and pressed against the cylindrical portion 10c by the elastic thin plate 35 as in the conventional example. , bearing part 1 of motor 10
The receiver formed as a step 10b of 0a is mounted on the surface. Other parts that are not particularly described are all configured in the same manner as in the conventional example.

As described above, the motor 1 is attached to the bearing portion 10a of the motor 10.
At the same time, a step 10b is formed at a predetermined height from the reference plane F of 0, and at the same time, a cylindrical portion 10c having a cylindrical shape centered on the rotation center of the motor 10 is formed perpendicular to the disk rotation surface following the step IOb. , the cough step part lOb and the cylindrical part 10c are formed.
When the guide rod 21 is attached so as to be pressed against the corner formed by the
b is defined by the height h% of the upper surface E with respect to the reference plane F, and the horizontal position is determined by the motor lO as shown in FIG.
is defined by the radius R of the cylindrical portion 10C from the center of rotation.

In this way, the horizontal position of the guide rod 21 is
If the cylindrical portion Lock' formed in the bearing portion 10a of the O is directly defined, the azimuth can be accurately defined by defining the angle of the magnetic head 19 with respect to the direction of movement of the carriage 12 with respect to the guide rod 21. In other words, even if the mounting end 21a of the guide rod 21 to the housing 2 is not accurate in the horizontal direction, the guide rod 21 will be positioned in the tangential direction of the cylindrical portion 10c of the bearing portion 10a of the motor 0. The relative position of the guide rod 21 with respect to the portion 10c remains unchanged, and the angle of the head with respect to the track of the disk also remains unchanged. Therefore, even if the carriage 12 is assembled into the housing 2, azimuth deviation does not occur because the housing 2 does not contribute to dimensional accuracy.

Regarding penetration, as mentioned above, the bearing part 10a of the motor 10 is formed with a stepped part 10b as a surface at a predetermined height from the reference plane F of the motor 10, and the upper surface E of this stepped part 10b is formed. , and the height from the upper surface B of the turntable 9 to the upper surface B of the turntable 9. By simply placing the guide rod 21 on this stepped portion 10b, the sliding of the magnetic head 19 from the reference surface F of the motor 10, that is, the reference surface A of the housing 20, is defined. The height h of the housing 2 from the reference surface in the conventional example is within the height dimension of the contact surface! Since this does not occur, the accuracy in the height direction is further improved than before.

At this time, the other end of the guide rod 21 is placed on the lower surface of the mounting groove 2b on the stepping motor 13 side formed in the housing 2, but the influence of the dimensional tolerance of the lower surface of this mounting groove 2b is This is determined by the distance between the contact point (for example, 0 point) with the stepped portion 10b of 21 and the contact point (for example, H point) on the lower surface of the mounting groove 2b, and the cut-out of the dimensional tolerance of the mounting 1a2b. The amount by which the dimensional tolerance appears as an error in the height direction of the sliding surface of the magnetic head 19 is extremely small, and compared to the predetermined dimensional tolerance, this amount can be almost ignored.

In this way, in the above embodiment, the stepped portion lOb is formed to eliminate interference with the dimensional accuracy of the housing 2 in the height direction of the disk, so that not only the azimuth but also the penetration setting can be made with precision. I can do it well.

In this embodiment, since the inside of the carriage 12 is guided by the guide rod 21 and the screw shaft 20 which also serves as the guide rod 21, only one guide rod 21 is connected to the bearing part of the motor 10. 10a is shown as an example, but depending on the type of drive means, it is also possible to have a structure in which two guide rods are locked, and furthermore, a screw shaft 20 that also serves as a guide rod may be configured. It is also possible to directly lock the bearing portion 13b of the motor 10 to the bearing portion 10a of the motor 10.

〔Effect of the invention〕

As described above, according to the present invention, a part of the guide means such as a guide rod is pressed against and attached to the bearing part of the cylindrical motor, and the horizontal position of the guide means is directly determined by the motor. For example, since the housing element can be eliminated when positioning the guide means in the horizontal direction, it is possible to suppress the occurrence of azimuth deviation caused by the machining accuracy of the housing. This eliminates the need for azimuth adjustment after installation. Additionally, machining the motor bearing is easier and more accurate than machining the mounting grooves for guide rods, etc., so the machining becomes easier and manufacturing costs can be reduced.

[Brief explanation of the drawing]

Figures 1 to 3 are for explaining the present invention in detail. Figure 1 is a plan view showing the housing, motor, and carriage transport mechanism, and Figures 2 and 3 are support for the guide rod. Conceptual diagrams showing the structure, FIGS. 4 to 8 are for explaining the conventional example. FIG. 4 is a plan view showing the housing, motor, and carriage transport mechanism, and FIG. A partial sectional view, FIG. 6 is a plan view of the housing,
FIG. 7 is an explanatory diagram showing how to attach the guide rod, and FIG. 8 is a conceptual diagram showing the support structure of the guide rod. 2...Housing, 9...Turntable, 1
0...Motor, 10a...Bearing section, 10b...
...Stepped portion, 10c...Cylindrical portion, 12...Carriage, 14...Transfer mechanism, 19...Magnetic head, 21...Guide rod. 1st Father '72E 3 Tao 4-Turn 5 Yen

Claims (3)

[Claims] (1) A drive means for rotationally driving an information recording medium formed in a disk shape, a carriage equipped with a recording/reproducing head, and a transport means for transporting the carriage in the radial direction of the information recording medium along a guide means. , in a disk drive device that records and reproduces information on the recording medium,
A side surface of a bearing portion of a motor for rotating the recording medium of the driving means is formed into a cylindrical shape, and a part of the guide means is brought into contact with the side surface to define a position of the guide means in a direction parallel to the recording medium. A disk drive device characterized by: (2) The disk drive device according to claim (1), wherein the guide means is a guide rod. (3) In claim (1), the guide means is a screw shaft of a transfer means that also serves as a guide rod, and a part of the guide means is a bearing that supports the screw shaft. Characteristic disk drive device.