Title: Impact analysis on automatic focusing actuator for mobile electronic devices

Authors: Yongho Jeon; Yeon-Wook Sung; Seongmin Lee; Hye-Jin Lee; Moon Gu Lee

Addresses: Department of Mechanical Engineering, Ajou University, San 5, Woncheon-dong, Yeongtong-gu, Suwon, 443-749, Korea ' Department of Mechanical Engineering, Ajou University, San 5, Woncheon-dong, Yeongtong-gu, Suwon, 443-749, Korea ' VCM Development Team, LG innotek Components R&D Center 1271, Sa-3dong, Sangrok-gu, Ansan-si, Gyeonggi-do, 426-791, Korea ' Industrial Convergence Division, Korea Institute of Industrial Technology, 1271-18, Sa-3 dong, Sangrok-gu, Ansan City, Gyeonggi-do, 426-173, Korea ' Department of Mechanical Engineering, Ajou University, San 5, Woncheon-dong, Yeongtong-gu, Suwon, 443-749, Korea

Abstract: Mobile electronic devices are required to pass the drop test which simulates the impact of a fall when a device slips out of a user's hand during handling. This paper studies the impact analysis for an automatic focusing (AF) actuator of a camera module in a mobile electronic device using finite element analysis. The primary focus of the analysis is on the behaviour of the leaf springs because they are the most fragile parts. With this model, the concentrated stress and permanent deformation in the clamped and the curved parts of the springs were examined. Damage to these features can result in unwanted motion of the AF actuator, which then may be detrimental to the image quality of the camera. This analysis is helpful not only to develop AF actuators without fabricating the real product, but also to save lead time and cost during the development of new products.

Keywords: impact analysis; finite element analysis; FEA; automatic focusing actuators; mobile electronics; mobile devices; drop test; camera module; leaf springs; modelling; concentrated stress; permanent deformation.

DOI: 10.1504/IJMPT.2014.059040

International Journal of Materials and Product Technology, 2014 Vol.48 No.1/2/3/4, pp.234 - 247

Received: 18 Jan 2013
Accepted: 23 Aug 2013

Published online: 30 May 2014 *

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