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Title of Journal: Microsyst Technol

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Abbravation: Microsystem Technologies

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Springer-Verlag

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DOI

10.1007/s00894-017-3270-7

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ISSN

1432-1858

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Autofocusing actuator and camera module including

Authors: Byung Youn Song Do Sun Nam Jeen Gi Kim Jong Se Park Jae Yeol Lee Kyung Sik Shin Junghoon Lee
Publish Date: 2009/01/30
Volume: 16, Issue: 1-2, Pages: 149-
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Abstract

Recent cellular phones have highresolution compact digital camera modules that have several millions of pixels Although being small such several megapixel camera modules definitely need to be able to execute autofocusing and/or optical zooming in order to obtain precise images Hence image photographing devices having driving mechanisms that can move a lens group in the direction parallel to an optical axis have appeared such as piezoelectric type linier motor type and voice coil motor type Although these technologies are already popular in existing digital cameras driving mechanism for camera modules in cellular phones needs to be extremely improved because their requirements are totally different from usual digital cameras Compact image photographing devices which are installed in mobile apparatuses should improve portability by reducing their sizes and weights and increase usetime of a battery by reducing power consumption Weakened suspension eg thickness is 002 mm or less in order to minimize an elastic coefficient for drastic decrease of driving current frequently occurs permanent stepout of a lens group by plastic deformation of the metal suspensions when it comes to getting shocks from accidental drops of a handset The proposed autofocusing actuator using conductive polyimide as a flexible diaphragm satisfies these requirements of ultra slim cell phones This polyimide suspension shows ultimate toughness when it comes to droptest of cell phones This actuator also shows high performance quite enough for several megapixel camera modules for ultra slim cellular phones the moving range is up to 035 mm the DC sensitivity is 02 mm/140 mA and the resistance at the terminal is 22 Ohm whereas the aperture is 68 mm and the overall size is 10 × 10 × 395 mm Most of all the robustness against drop and shock has been dramatically increased with no change of reliability under high temperature and high humidity condition because of the flexibility of the conductive polyimide suspensionThis work was supported by the Korea Science and Engineering Foundation KOSEF grant funded by the Korea government MOST R0A2007000 100510 This research was also supported by Pioneer RD program for converging technology through the Korea Science and Engineering Foundation funded by the Ministry of Education Science and Technology Grant number M1071127000108M112700110

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