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초록· 키워드

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We have developed a compact and cost-effective camera module on the basis of wafer-scale-replica processing. A multiple-layered structure of several aspheric lenses in a mobile-phone camera module is first assembled by bonding multiple glass-wafers on which 2-dimensional replica arrays of identical aspheric lenses are UV-embossed, followed by dicing the stacked wafers and packaging them with image sensor chips. This wafer-scale processing leads to at least 95% yield in massproduction, and potentially to a very slim phone with camera-module less than 2 ㎜ in thickness. We have demonstrated a VGA camera module fabricated by the wafer-scale-replica processing with various UV-curable polymers having refractive indices between 1.4 and 1.6, and with three different glass-wafers of which both surfaces are embossed as aspheric lenses having 230 ㎛ sag-height and μ aspheric-coefficients of lens polynomials up to tenth-order. We have found that precise compensation in material shrinkage of the polymer materials is one of the most technical challenges, in orderto achieve a higher resolution in wafer-scaled lenses for mobile-phone camera modules.

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영어 초록
Ⅰ. INTRODUCTION
Ⅱ. CONCEPT OF WAFER-SCALE REPLICATION PROCESS
Ⅲ. DESIGN AND EXPERIMENT
Ⅳ. FABRICATION OF VGA CAMERA MODULES
Ⅴ. CONCLUSIONS
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UCI(KEPA) : I410-ECN-0101-2009-425-017365959