JPS63138588A - Data memory device - Google Patents

Abstract

PURPOSE:To minimize the occupied area of a vibration-proof rubber and to improve an oscillation resistance and an impact resistance by forming an uneven surface at least on three surfaces out of abutting surfaces abutted to the base frame, mounting frame and vibration-proof holding plate of the vibration-proof rubber, and making at least one surface into the surface orthogonal to the abutting surface with the holding plate. CONSTITUTION:A vibration-proof rubber has base abutting surfaces 11 and 12, mounting frame abutting surfaces 13 and 14 and a vibration-proof rubber holding plate abutting surface 15. A projecting part is provided at surfaces 11, 14 and 15. The height H of the projecting part is a sum (l+m) or above of a relative amplitude maximum value (l) of a base frame and the mounting frame due to the oscillation added to a device at the time of data recording and reproducing and a crushing dimension (m) due to the fitting of the vibration- proof rubber, and is a sum (n+m) or below of a relative amplitude maximum value (n) and the dimension (m) due to the device in the same way. Thus, a shock absorbing rubber is eliminated and the oscillation resistance and the impact resistance are improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vibration-proof rubber shape for a data storage device.

[Conventional technology]

A base frame 41 is supported by a mount frame 42 via vibration isolating rubber 43, as shown in FIG. 4, which is a plan view (partial view) of a conventional data storage device.

A perspective view of the anti-vibration rubber 43 is shown in FIG. 5, and the anti-vibration rubber surface 51
, the rubber inner surface 55 has one surface 52. which is in contact with the base frame 41. One surface 53 of the outer diameter surface 54 that is in contact with the mount frame 42 is in contact with the vibration-proof rubber pressing plate 46 . The anti-vibration rubber 43 includes a anti-vibration rubber presser plate 46 and a screw 45.
] The base frame 41 is pressed down and attached to the base frame 41. The data storage device has a mount frame 42 fixed to a host computer or the like. External vibrations, shocks, etc. are applied to the mount frame 42 and transmitted to the base frame 41 (device main body) through the vibration isolating rubber 0. The recording medium, head, actuator, etc. (not shown) are fixed in the pace 7 frame.
Data is being recorded and played back. The anti-vibration rubber 43 is.

It plays the role of making it difficult for external disturbances applied to the mount frame to be transmitted to the base 7 frame. Anti-vibration rubber has both spring characteristics and damper characteristics.

When vibration or impact is applied in the V direction in FIG. 4, the surfaces 51 and @52 in FIG. Compression and expansion of the rubber between the surfaces 52 and 53 serve as a spring and a damper.

The receiver has one surface 54 and one surface 55 to withstand vibration and impact in the eight directions shown in FIG. 4.

In recent years, the miniaturization of data storage devices has progressed, and portability of data storage devices has been required.
There is a growing demand for improved impact resistance.

The device is required to have vibration resistance in the frequency range of about 10Hz to about 500Hg, and the input pulse is about 10 to 2Dma.
Impact resistance against half-sine waves of ec is required.

The important vibration and shock resistance characteristics of a device, and the characteristics that are difficult to improve, are the vibration resistance during data recording and reproduction, and the shock resistance during movement and transportation of the device when not in operation.

In recent years, with the increase in the capacity and recording density of devices, the allowable off-track amount has become smaller. ,6. The ability required for vibration resistance during recording and reproduction is significant. On the other hand, the resonance point of the anti-vibration rubber is set to a low frequency to widen the frequency range that corresponds to the anti-vibration region. Furthermore, in order to improve head positioning accuracy (reduce off-track), an increasing number of devices are using the closed-Drug servo system, which feeds back and uses positioning signals from the head.

Regarding the frequency characteristics of the positioning servo characteristics, the positioning characteristics are better in the low frequency range, so the resonance frequency of the anti-vibration rubber is designed to be low. A first method for lowering this resonant frequency is to soften the material of the rectangular rubber shown in FIG.

As a second method, the shape of the vibration isolating rubber is made into a rectangular hollow rubber shape as shown in FIG. 6 (a sectional view of the vibration isolating rubber installed), and the spring constant of the rubber is reduced.

[Problem that the invention seeks to solve]

However, in the first method of the prior art described above, the selection of usable rubber materials is limited because the material of the vibration-proof rubber must be soft.

(Conventional) Often used as anti-vibration rubber. Nitrile rubber (NBR) with high diving properties.

Butyl rubber (XR) is a medium-hard rubber with a hardness (R8) of 100% or less;
R) etc. must be used, which increases the transmission efficiency at the resonance point, which goes against the purpose of vibration isolation. In addition, soft, high-damping rubbers have been developed, but they have the problems of high cost and a high rate of change in rubber hardness due to temperature changes.

In addition, the second method has the problem that the rubber size must be larger than that of the first method, and the volume of the entire device increases, which is against the trend toward miniaturization of the device.

@1. In both methods, since the vibration isolating rubber has a small spring constant of φ, it is necessary to provide a large shock shaking space to accommodate the impact of moving and transporting the device when it is not in operation. As a countermeasure to this problem, a cushioning rubber 47 is attached to the pace 7 frame 41 as shown in Fig. 4, so that the base frame 41 shakes greatly when a large impact is applied. A method has been adopted to reduce the amount of sway when the shock absorber rubber 47 hits the mount frame 42K.However, this increases the number of parts for the shock absorber and increases the man-hours required to attach the shock absorber to the base frame, increasing costs. In addition, the shape of the pace 7 frame must be made so that the cushioning rubber can be attached, which reduces the degree of freedom in design.

The present invention is intended to solve this serious problem.The purpose of the present invention is to reduce the volume occupied by the anti-vibration rubber, eliminate the need for a cushioning rubber, and provide vibration-resistant construction using only one type of anti-vibration rubber. The purpose of the present invention is to provide a compact data storage device with good impact resistance, high capacity, and high density recording.

[Means for solving problems]

The anti-vibration rubber used in the data storage device of the present invention has a contact surface that abuts on each of the base frame, the mount frame, and the anti-vibration rubber presser plate.

It is characterized in that at least three of the abutment surfaces are formed with uneven surfaces, and at least one of the abutment surfaces is a surface that is substantially orthogonal to the abutment surface that abuts the vibration-proof rubber presser plate.

[Effect]

According to the above configuration of the present invention, the area where the convex portion of the anti-vibration rubber contacts the base frame, the mount frame, and the anti-vibration rubber press plate is smaller than when the entire anti-vibration rubber surface makes contact. In a state where only the convex portions are in contact and vibrations and shocks are applied during data recording and reproduction, the spring constant of the vibration isolating rubber is small and the resonant frequency is low. This widens the vibration isolation frequency range. In addition, in devices that use a closed-loop servo for head positioning, the resonance point can be set at a low frequency point with high servo gain.

Off-track amount can be reduced.

Also, moving equipment that is subject to large vibrations and shocks.

During transportation, the amount of displacement (deflection) of the anti-vibration rubber increases, and the entire surface of the anti-vibration rubber comes into contact with the base frame, mount frame, and anti-vibration rubber press plate, and the spring constant of the anti-vibration rubber increases. The ratio of absorbed energy to the amount of displacement (deflection t) is large.

Buffer rubber can be abolished. Also, the displacement tC of the device is smaller than that of vibration isolating rubber, which has a small overall spring constant.

Shock shake space) Can be made small, and how much space does the entire device occupy? I-Can be written.

[Implementation row]

1rIA is a perspective view of a vibration isolating rubber in an embodiment of the present invention. This anti-vibration rubber is attached to the base frame 41 and the mount 7 frame 42, as shown in FIG. ff
rll, 1 surface 13 where surface 12 is the base 7 frame contact surface
, surface 14 is the mount frame self-contacting surface.

Surface 15 is a contact surface of the vibration-proof rubber presser plate. 16 is a convex portion, the surface 11. which is in contact with the base frame 41. Of the surfaces 12, a convex portion is provided only on the 111th surface. Also, the surface 1 that is in contact with the mount frame 42
3. Convex portions are provided only on the surface 141 of the surfaces 14. A convex portion is also provided on the surface 15 that comes into contact with the anti-vibration rubber presser plate 46.

The height E of the convex portion is determined by the maximum relative amplitude [! and the sum (J+m) of the crushing dimension due to the vibration isolation and rubber attachment K, and the maximum relative amplitude n of the base frame 41 and the mount frame 42 due to the impact applied to the device during data recording and playback and the vibration isolation rubber. It shall be less than or equal to the sum (n+m) of the crushing dimension due to installation. That is, (J
+ m)≦■≦(n ten hires).

Figure 3 shows the displacement and external force characteristics of the vibration isolating rubber.

A solid line 31 indicates the vibration-proof rubber characteristics of the present invention. When the external force is small, the spring constant (external force/displacement) is small, and when the displacement is equal to the convex height Ti, the spring constant becomes large.

In FIG. 1, consider, for example, the portion JK sandwiched between surfaces 11 and 13. The spring constant of the anti-vibration rubber is
(Rubber contact area/rubber height) X On one surface 11 determined by Young's modulus, the contact area of the convex part is kana 9 smaller than the working part on the 8th part, and the rubber height is TK Since it can be approximated, the spring constant can be made slightly smaller in the R portion. Therefore, by using a rubber (hard rubber) with a large Young's modulus as the vibration-proof rubber material, it is possible to realize a rubber characteristic with a small spring constant and lower the resonance frequency when recording and reproducing data.

In addition, when the displacement at part 7 exceeds Ht-, the spring constant of the vibration isolating rubber with a large contact area becomes large, and the characteristic of large non-linearity is shown by the solid line 31 in Fig. 3, as shown in Fig. 3.
The displacement and external force characteristics of rubber with a small spring constant (soft) having the same spring constant as that of the R part are shown in the wavy line 32. Maximum external force applied during data recording and playback (3rd
It is 10 to 100 times as large as IF') in the figure. The amount of displacement at this time, as shown in Figure 3, is A for the rubber of the present invention and B for the soft rubber.1 By using the vibration isolating rubber of the present invention,
The amount of displacement can be reduced, and the shock shake space is also small], and the space required to install the device can be reduced.

Moreover, the cushioning rubber for preventing the mount frame 42 rx'g from colliding with the base frame 41 is also unnecessary.

Of course, the shape of the convex part may be the shape shown in the other embodiments of the present invention (FIG. 2), and the cross-sectional shape of the convex part is rectangular in the present invention, but it does not have to be rectangular. A modified cross-sectional shape such as a trapezoid may also be used.

〔Effect of the invention〕

As described above, according to the first invention, the resonance frequency of the vibration isolating rubber during data recording and reproduction can be lowered, thereby reducing the amount of off-track during data recording and reproduction, and making the device resistant to vibration and shock during data recording and reproduction. Characteristics can be improved.

In addition, the amount of swaying and shock shaking space required during movement and transportation of the device (the space occupied when installing the device) can be reduced, and the system such as the host computer to which the device is attached can be downsized.

In addition, the cushioning rubber can be eliminated, contributing to a reduction in the number of parts, cost reduction, and an increase in the degree of freedom in designing the shape of the base frame.

Based on the above, by simply changing the shape of the anti-vibration rubber, one type of anti-vibration rubber can be used to simultaneously improve vibration and shock resistance during data recording and playback, equipment movement, and transportation. We can provide nine devices that meet the demands for higher capacity, higher density recording, and smaller size devices.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the vibration-proof rubber of the present invention. FIG. 2 is a perspective view showing another embodiment of the vibration isolating rubber according to the present invention. Figure 3 shows the displacement and external force characteristics of the anti-vibration rubber. FIG. 4 is a plan view showing a conventional data recording device. FIG. 5 is a perspective view of a conventional anti-vibration rubber. FIG. 6 is a cross-sectional view of another conventional anti-vibration rubber assembly. 11...Base frame abutting space 12...Base frame abutting surface 13'...Mount 7 frame abutting surface 14...Mount 7 frame abutting surface 15...Vibration-proof rubber presser plate abutting Surface 16/111 Convex portion 31... Displacement of the vibration isolating rubber of the present invention, external force characteristic line section... Conventional vibration isolating rubber displacement, external force characteristic line 41... Pace 7 frame 42... Mount frame 43...・Vibration-proof rubber 45...Screw 46...Vibration-proof rubber holding plate 47...O buffer rubber and above Applicant: Seiko Epson Corporation 12; Haze Frey West Key 1 Stone Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) A base frame to which a recording medium for storing data, a head for recording and reproducing data on the recording medium, and an actuator for moving the head and positioning it on a predetermined track is attached, is made of anti-vibration rubber. In the data storage device supported by the mount frame, the vibration isolating rubber has a contact surface that abuts each of the base frame, the mount frame, and the vibration isolator presser plate, and the contact surface A data storage device characterized in that at least three of the surfaces are formed with uneven surfaces, and at least one of the surfaces is a surface that is substantially perpendicular to a contact surface that contacts the vibration-proof rubber presser plate.