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Shock-cushioning structure

a technology of shock and vibration, applied in the direction of shock absorbers, packaging foodstuffs, packaged goods, etc., can solve the problems of direct shock and vibration of the hard disk held within the information processing apparatus, damage to the hard disk more severely, and damage to the hard disk. to achieve the effect of protecting the hard disk

Inactive Publication Date: 2005-06-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a small-volumed shock-cushioning structure that can protect a hard disk from shocks of different magnitudes. The structure consists of two shock-cushioning materials that have different stress-strain characteristics. The first material absorbs impact stress with a lower effective cushioning stress, while the second material absorbs impact stress with a higher effective cushioning stress. This allows the structure to effectively absorb shocks of different magnitudes and protect the hard disk from damage."

Problems solved by technology

Accordingly, in the case of carrying the information processing apparatus, shock and vibration transmitted into the information processing apparatus might damage the hard disk held within the information processing apparatus.
Further, in the case where the hard disk is carried by itself, rather than held in the information processing apparatus, the hard disk might directly undergo shock and vibration, and therefore might be damaged more severely.
Furthermore, even if the hard disk is kept in storage, the hard disk might be damaged due to unexpected shock and vibration, depending on the circumstance in which it is kept in storage.
In such a situation, the hard disk held inside as a storage device might be damaged by shock and / or vibration transmitted into the information processing apparatus.
On the other hand, when the hard disk 3 is in operation, the magnetic head is located above a platter, and the hard disk 3 might be damaged even by a small shock.
However, in order to realize a lighter, smaller, and thinner information processing apparatus, it is necessary to reduce the size of the shock-cushioning structure for protecting the hard disk from the shock, so that the amount of shrinkage and deformation is restricted.
However, a hard shock-cushioning material for absorbing a large shock reflects a small shock equivalent to a shock which is required to be reliably absorbed when the hard disk is in operation, and therefore the small shockwave cannot be satisfactorily absorbed.
Accordingly, if a space for accommodating the conventional shock-cushioning structure is limited, it is not possible to effectively protect the hard disk from shocks of two different shock values.

Method used

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Examples

Experimental program
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Effect test

first embodiment

[0044] A shock-cushioning structure according to a first embodiment of the present invention is described below with reference to FIGS. 1 and 2. In FIG. 1, arrow Fg indicates a direction of an impact stress applied to a shock-cushioning structure SA1. The shock-cushioning structure SA1 includes a solid CALL formed by the soft shock absorbing material AL and a solid CAH1 formed by the hard shock absorbing material AH. In FIG. 2, two dotted curves indicate the low and high shock absorption characteristics CL and CH as shown in FIG. 9, and solid line C1 indicates a shock absorption characteristic of the shock-cushioning structure SA1.

[0045] Specifically, in the shock-cushioning structure SA1, the soft shock absorbing material AL having the low shock absorption characteristic CL responds to an impact stress of about 0.04 Kgf / mm2 or less, and the soft shock absorbing material AH having the high shock absorption characteristic CH responds to an impact stress of more than about 0.04 Kgf / m...

second embodiment

[0047] A shock-cushioning structure according to a second embodiment of the present invention is described below with reference to FIGS. 3 and 4. In FIG. 3, a shock-cushioning structure SA2 includes a solid CAL2 formed by the soft shock absorbing material AL and a solid CAH2 formed by the hard shock absorbing material AH. The solid CAH2 is similar in size to the above-described solid CAH1. Both of the solids CAL2 and CAH2 are formed in a wedge-like shape. A length TL2a of a shorter side of the solid CAL2 and a length TL2b of a longer side of the solid CAL2 are preferably represented by the following expressions (1) and (2), respectively.

TL2a=TL1−TH1 / 2   (1)

TL2b=TL1+TH1 / 2   (2)

[0048] A length TH2a of a longer side of the solid CAH2 and a length TH2b of a shorter side of the solid CAH2 are preferably represented by the following expressions (3) and (4), respectively.

TH2a=T−TL2a   (3)

TH2b=T−TL2b   (4)

[0049]FIG. 4 shows a shock absorption characteristic C2 of the shock-cushioning ...

third embodiment

[0050] A shock-cushioning structure according to a third embodiment of the present invention is described below with reference to FIGS. 5 and 6. In FIG. 5, similar to the shock-cushioning structure SA2, a shock-cushioning structure SA3 includes a solid CAL3 formed by the soft shock absorbing material AL and a solid CAH3 formed by the hard shock absorbing material AH. The solids CAH3 and CAL3 have curved connection surfaces. Specifically, the connection surface of the solid CAH3 is concave, and the connection surface of the solid CAL3 is convex.

[0051] A length TL3a of a shorter side of the solid CAL3 and a length TL3b of a longer side of the solid CAL3 are preferably represented by the following expressions (5) and (6), respectively.

TL3a≦TL1−TH1 / 2   (5)

TL3b=TL1+TH1 / 2   (6)

[0052] A length TH3a of a longer side of the solid CAL3 and a length TH3b of a shorter side of the solid CAH3 are preferably represented by the following expressions (7) and (8) ,respectively.

TH3a=T−TL3a   (7) ...

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Abstract

A small-volumed shock-cushioning structure SA of the present invention guarantees absorption of shocks of different magnitudes associated with two different states of a hard disk, and thereby to effectively protect the hard disk from the shocks of different magnitudes. The shock-cushioning structure SA includes a first shock-cushioning material CAL having a first stress-strain characteristic AL with a first effective cushioning stress, and a second shock-cushioning material CAH having a second stress-strain characteristic AH with a second effective cushioning stress greater than the first effective cushioning stress of the first stress-strain characteristic AL.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a shock-cushioning structure for holding a device susceptible to externally applied shocks and protecting the device by absorbing shocks applied thereto. More particularly, the present invention relates to a shock-cushioning structure used for protecting a device vulnerable to shocks, e.g., a hard disk drive incorporated in a notebook computer. [0003] 2. Description of the Background Art [0004] In recent years, a wide range of information processing apparatuses, including a notebook computer, have become lighter, smaller, and thinner, while achieving higher performance and larger capacity. In order to satisfy the needs of higher performance and larger capacity, an information processing apparatus has incorporated therein a high-density and high-precision hard disk drive (hereinafter, simply referred to as a “hard disk”) as a storage device. In order to extend storage capacity or prot...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F16F7/00B65D81/02B65D85/68G11B25/04G11B33/14
CPCB65D2585/6835B65D81/022
Inventor SHIRATO, KIYOSHI
Owner PANASONIC CORP