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Technical Brief

Study of Novel Spring Unit for Longstroke Semi-Auto Sliding Mechanism of Information Technology Applications

[+] Author and Article Information
Y. P. Jeon

Precision Manufacturing System Division,
Pusan National University,
Pusan 609-735, Korea
e-mail: ypjeon@pusan.ac.kr

H. Y. Seo

Department of Computer Science and Engineering,
Pusan National University,
Pusan 609-735, Korea
e-mail: tanyak@pusan.ac.kr

J. D. Kim

Department of Computer Science and Engineering,
Pusan National University,
Pusan 609-735, Korea
e-mail: kimjd@pusan.ac.kr

C. G. Kang

School of Mechanical Engineering,
Engineering Research Center for Net Shape
and Die Manufacturing,
Pusan National University,
Pusan 609-735, Korea
e-mail: cgkang@pusan.ac.kr

1Corresponding author.

Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received August 9, 2011; final manuscript received February 13, 2014; published online April 28, 2014. Assoc. Editor: Matthew B. Parkinson.

J. Mech. Des 136(7), 074501 (Apr 28, 2014) (4 pages) Paper No: MD-11-1337; doi: 10.1115/1.4027318 History: Received August 09, 2011; Revised February 13, 2014

Currently, there is intense competition in the industry for the development of new portable handsets. Maximizing the screen size and enhancing the performance are of utmost importance for the design of contemporary cellular phones. In particular, a sliding phone has a greater number of functions than other types of cellular phones, and the screen size of a sliding phone is relatively larger. However, because the existing spring units have limitations in terms of their mechanical performance, it is impossible for the display size to be maximized by transferring shortcut buttons, called navi-keys, which are located on the same plane of the display unit. The life cycle of a sliding phone is inversely proportional to the degree of spring deformation, which in turn depends on the sliding stroke. Therefore, a long-stroke sliding mechanism was investigated, and the manufacturing process for a novel sliding spring unit was proposed without increasing the thickness of the existing cellular phone. The possibility of performing semi-auto sliding strokes (>60 mm) was verified by flatness tests, life cycle tests, and sliding-force measurements. The performance of the designed spring unit was verified by carrying out reliability tests such as life cycle tests under the condition that the number of strokes was more than 100,000 and measurement tests to check whether the sliding force exceeded 250 gf.

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Copyright © 2014 by ASME
Topics: Springs
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References

Figures

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Fig. 1

Concept design of double torsion spring unit

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Fig. 2

The structure of the double torsion spring

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Fig. 3

Conceptional diagram of long stoke slide hinge. (a) Concept design of long stroke hinge with double torsion springs and (b) deformation of long stroke slide hinge during the sliding.

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Fig. 4

Flatness testing method. (a) Go/Go no gauge and (b) interference check.

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