JPS622019A - Disk device - Google Patents

Abstract

PURPOSE:To prevent deflection or inclination of a bearing and prevent a rotary shaft from shaking by providing a reinforcing member ranging from a substrate to a cylindrical bearing provided in an integrated form with said substrate. CONSTITUTION:A base 1 consists of a substrate 1a and a cylindrical bearing 1b provided in an integrated form with the substrate 1a. A hub 6 on which magnetic disks 9 are installed is fixed to the top end of a shaft 5 supported by the cylindrical bearing 1b via a bearing 3. And, a reinforcing member 13 is provided ranging from the substrate 1a to the bearing 1b of the base 1. As a result, the deflection or inclination of the bearing 1b of the base 1 can be greatly reduced, preventing a shaft 5 from shaking.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk device that rotates an information recording disk such as a magnetic disk.

[Conventional technology]

FIG. 6 is a vertical cross-sectional view showing a conventional magnetic disk device disclosed in, for example, Utility Model Publication No. 58-30965.
It consists of a cylindrical bearing 1b integrated into a. 2 is a stator provided on the outer periphery of the bearing 1b, 3 is a bearing similarly installed at both ends of the bearing 1b, 4 is a preload spring, and 5 is a shaft rotatably supported on the bearing 1b via the bearing 3 ( 6 corresponds to the stator 2, and 6 corresponds to the stator 2. This rotor magnet is attached to the inner wall of the hub 6 together with the rotor yoke 8, and together with the stator 2 constitutes a drive device M that applies rotational force to the hub 6. Reference numeral 9 denotes a magnetic disk for recording information attached to the outer periphery of the hub 6. A plurality of disks 9 are stacked one after another on the flange 6a with a secondary base plate 0 in between, and a cap 11 is placed on top of the disks. It is held down and fixed. Note that 12 is a magnetic shield plate provided to reduce the influence of magnetic leakage to the outside of the device from the rotor magnet or the like.

Next, the operation will be explained. For example, rotor magnet 7
The position of the rotor magnet 7 is detected by detecting the magnetic field with magnetically sensitive photons (not shown), the current of the stator 2 is changed correspondingly, and the electromagnetic force between the rotor magnet 7 and the stator 2 is used. , a hub 6 fixed to a shaft 5 attached to a base 1 via a bearing 3 is rotationally driven, and a disk 9 attached to the hub 6 is rotated. Further, magnetic leakage from the rotor magnet 7 and the like to the outside of the device is reduced by the magnetic shield plate 12.

[Problem that the invention seeks to solve]

Incidentally, in this type of device, the accuracy of recording and reproducing information is significantly reduced due to slight wobbling of the rotating shaft, so dimensional accuracy of the fitting portion between the bearing and the base is strictly required. Therefore, materials with good workability are used for baking,
For example, aluminum is used. However, although materials such as aluminum have good workability, they are relatively weak in strength, and due to unbalance in the rotating parts, the base bearing is prone to bending or tilting, which increases the axial runout of the rotating shaft, resulting in poor recording and playback accuracy. There was a problem in that the value decreased. Further, in order to minimize the above-mentioned deflection, etc., the thickness of the base cannot be made very thin, which poses a problem in terms of miniaturization of the device.

This invention was made in order to solve the above-mentioned problems.The base is made of a material with good workability and the wall thickness is thin (even though the bearing part is made of a material that does not bend or tilt). ,
The purpose of this invention is to obtain a compact, high-precision disk device with small axial runout.

Means for Solving Problem c] The disk device according to the present invention is provided with a reinforcing member across the substrate and the bearing.

[Effect]

In this invention, even if the substrate and the bearing are made of a thin material with good workability, they are reinforced with a reinforcing member, so that the deflection or inclination of the bearing becomes 1:, M<, and the axis of the rotating shaft. Shaking is eliminated.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. Note that the same reference numerals are used for the same or equivalent parts as in the conventional example shown in FIG. 6, and the explanation thereof will be omitted.

FIG. 1 is a vertical cross-sectional view showing the overall configuration of the embodiment, and 13 in the figure is the substrate 1a of the base 1 and the bearing 1b.
In this embodiment, a magnetic steel plate is placed inside the base 1 made of aluminum or the like, and the central part of the disc-shaped part is connected to the base 1 as shown in FIG. The reinforcing member 13 is a part that protrudes according to the shape.
It is integrally molded as a. Note that the conventional magnetic shield plate 12 is not provided in this embodiment.

Next, the effect will be explained. Note that the rotation principle of the drive device M is the same as that of the conventional one.

Rotating parts, ie hub 6, disk 9. Spacer 10.
Cap 11. Rotor yoke 8 and rotor magnet 7
If there is an imbalance in the shaft 5, etc., the shaft 5 tends to tilt in the direction of the imbalance.

At this time, if the gap between the bearing 1b of the base 1 and the bearing 3 is small, the axial runout due to this inclination will be reduced.The base 1 of this embodiment is made of a material with good workability such as aluminum, so this gap should be made small. It is possible to do so.

On the other hand, the bearing ib of the base 1 may be bent or tilted due to the unbalance of the rotating part. Even if the base 1 is made considerably thinner, the deflection and inclination are significantly smaller than that of a base made only of aluminum.Therefore, the axial runout of the shaft 5 is eliminated, and a decrease in the recording and reproducing accuracy of the apparatus can be prevented.

Also, in this embodiment, a magnetic shield plate is not provided to prevent magnetic leakage from the rotor magnet 7, etc., but since the reinforcing member 13 is a magnetic steel plate, it is used instead, and the number of components is reduced, making it similar to the conventional one. , can prevent magnetic leakage.

In the above embodiment, the reinforcing member 13 is shown embedded in the base 1, but as shown in FIG. 3, it may be fixed to the outer surface of the base by molding, press-fitting, adhesion, etc.

In addition, in the above embodiment, the reinforcing member 13 was shown as being embedded as a single item in the base 1, but as shown in FIG. In order to prevent this increase, the reinforcing member 13 and the bearing holder 14, which has a smaller thermal expansion than the base material, may be embedded together. Further, as shown in FIG. 5, the reinforcing member and the bearing holder may be configured as one part 13 and embedded in the base 1.

〔Effect of the invention〕

As described above, according to the present invention, since the reinforcing member is provided across the board and the bearing, the board, the bearing, etc. can be made of a material with good workability such as aluminum, and can be made thin. Since it is possible to prevent bearing deflection and IA, it is possible to obtain a compact, high-precision disk device with little shaft runout.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a magnetic disk device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a reinforcing member of the above embodiment, and FIGS. FIG. 6 is a vertical sectional view showing an example of a conventional magnetic disk device. ■... Base, la... Substrate, 1b... Cylindrical bearing, 2... Stator, 3... Bearing, 5...
Shaft (rotating shaft), 6... Hub, 7... Rotor magnet, 9... Magnetic disk (information recording disk), 13... Reinforcement member, M... Drive device. Note that the same reference numerals are used for the middle part of the figure or corresponding parts. Agent Masuo Oiwa (and 2 others) Showa
To the Chief Minister's Palace
721, Incident Display Patent Application No. 140942/1983 2,
Name of the invention Disk device 3, Person making the amendment Representative Moriya Shiki 4, Agent 5, ? ! Positive subject matter claims, detailed description of the invention, brief description of the drawings, and drawing section. 6. Contents of amendment (1) The claims are amended as shown in the attached sheet. (2) Page 2 of the specification, lines 4 and 5, lines 5, 6, and 8, page '4, lines 3, 19, and page 5. In the 1st line, the 9th line, the 2nd line on page 6, the 7th line, and the 8th line on page 8, the words ``bearing'' are corrected to ``the bearing is the holding part.'' (3) In the same book, page 4, line 11, the phrase "deflection" is corrected to "large deflection." (4) In the same book, page 5, line 2, page 6, line 12, the words ``no shake'' are corrected to ``small shake''. (5) The drawings and Figure 1 shall be amended as shown in the attached sheet. Above 2, Claims (1) A substrate and a cylindrical bearing integrated with this substrate are arranged in a supporting plate, and this bearing is attached to a supporting plate. A rotatably supported rotary shaft and an inner wall fixed to the rotary shaft cover the U portion of the bearing, and an information recording disk is attached to the outer periphery of the rotary shaft, which applies rotational force to the knob and the knob. What is claimed is: 1. A disk device comprising a drive device, characterized in that a reinforcing member is provided across the substrate and the bearing and the conveying tray. (2) The disk device according to claim 1, wherein the substrate and the bearing are made of aluminum and the reinforcing member is made of magnetic steel plate. Lambda device 1

Claims (2)

[Claims] (1) A substrate, a cylindrical bearing integrated with this substrate,
A rotating shaft rotatably supported by the bearing, a hub whose inner wall fixed to the rotating shaft covers the bearing and an information recording disk is mounted on the outer periphery, and a drive device that applies rotational force to the hub. In a disk device equipped with
A disk device characterized in that a reinforcing member is provided across the substrate and the bearing. (2) The disk device according to claim 1, wherein the substrate and the bearing are made of aluminum, and the reinforcing member is made of a magnetic steel plate.