24 August 2009 Optical system module having zooming function and image quality of mega pixel for a cellular phone camera
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Abstract
We designed and developed a cellular phone camera like HD digital still camera having zooming function. To design an optical system module having the auto-zooming and the image quality of 2M mega pixel using Code V, we considered 6 lenses which were four aspheric plastic lenses and two glass lenses. The specifications of designed optical system module for a cellular phone camera were the focal length of 4.29mm at wide position to 10.55mm at tele position, fnumber of 3.2 at wide position to 5.3 at tele position, and field of view of 27.4 degree at tele position to 65.8 degree at wide position. Its zoom ratio was 2.5. The values of modulation transfer function (MTF) at 200lp/mm of the designed optical system module were over 21% at zoom position. We applied the design results of optical system module to the fabrication of a cellular phone camera having the zoom ratio of 2.5 and the image quality of 2M mega pixel, and adopted the aspheric glass lens having higher abbe number to compensate chromatic aberration and the VCM (Voice Coil Motor) as sub-miniature motor. We fabricated the optical module system having zoom ratio of 2.5 and image quality of 2M mega pixel in order to apply to a HD cellular phone camera.
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Seong Jong Park, Seong Jong Park, Jong Jin Lee, Jong Jin Lee, Chang Sub Chung, Chang Sub Chung, } "Optical system module having zooming function and image quality of mega pixel for a cellular phone camera", Proc. SPIE 7428, Current Developments in Lens Design and Optical Engineering X, 74280T (24 August 2009); doi: 10.1117/12.825615; https://doi.org/10.1117/12.825615
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