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Circle Patterned Shape for Top Cover Stiffness Enhancement.

IP.com Disclosure Number: IPCOM000016372D
Original Publication Date: 2002-Nov-18
Included in the Prior Art Database: 2003-Jun-21
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Abstract

Disclosed is a circle patterned shape for Top cover stiffness enhancement.

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Circle Patterned Shape for Top Cover Stiffness Enhancement.

Disclosed is a circle patterned shape for Top cover stiffness enhancement.

Background;

Recently, Notebook PC is downsizing. Based on this, the spece which is allocated to PC part like HDD is getting small. Additionally, low cost competition brings rigidity of PC body down. Under such condition, external force to the PC is easy to come through the HDD. 2.5inch HDD which is mounting on Notebook PC has low stiffness of Top cover compared with one for Desktop or Server. The clearance between Top cover and Disk (Top clamp) is also small. Therefore, External force makes Top cover deform and causes interference between Top cover and Disk (Top clamp).(Fig.1) Interference in read/write operation leads to critical crash.

Fig. 1

Contents;

This invention enhanced stiffness of Top cover without material or thickness change. Top covers with circle patterned rib (Fig.3-7) have higher stiffness than one with rib which is commonly used by 2.5inch HDD. Value on the Fig.2-7 is result by finite element method analysis under the condition of table1.

Fig.8 is the result of actual measurement. Stiffness enhanced by about 23%.

Table1. Simulation condition

- Material: Aluminium

- Thickness: 0.4mm

- Young's modulus: 69000MPa

- Poisson's ratio: 0.345

- Dimensions: 95 x 75 mm

- Ribs: inside diameter=23mm, outside diameter=62mm, rib angle=45deg. depth=1mm/0.5mm(Fig.7 lower right part) - loading method: apply load 10mm in diameter at...