자동초점조절용 VCM 액추에이터의 구동특성에 관한 연구

Abstract

Product development is consisting by trend that accommodate almost function digital cam in camera phone that can speak of Mobile appliance, and competition about number of elemental area of image sensor is consisting for market prior occupation between these. Accordingly, is galloped by old painting going back of several million pixels in that elemental area of number hundred thousand pixels. Because area of camera module self-focusing (Auto Focus) function embodiment should be available basically from 2 million elemental areas and optic handful loading and miniaturization of module size are required compulsory more than 3 million elemental areas, is situation that development competition also about camera phone that load these function is controlled a fever more. Function of digital camera and portable phone sold by independent product past according to digital convergence flowing thus consol. camera phone appearing by current of new fashion character do. Storehouse pickup actuator (Optical pick-up actuator) to embody optic handful multi-function can classify by two. One is coil transfer style (Moving-coil type), and another is magnet transfer style (Moving-magnet type). Coil transfer style has several advantages because actuator is light and, sensitive relatively. Therefore, coil transfer style is used more extensively usually. Support structure decides position of Moving part (bobbin) in actuator, and take charge role that make strength of stability and the kind is Shaft type actuator, Hinge type actuator, Leaf spring type actuator, Wire spring type actuator. Propose in this research and small size camera phone self-focusing adjustment actuator that do city manufacture is similar with general storehouse pickup actuator drive way, but selected in cylindrical to reduce space that lens holder occupies because there is restriction loading of lens and space enemy. Also, AF actuator applied Leaf spring that is used in mentioned storehouse pickup actuator in front because is required exercise of top and bottom direction and widen width and control lens hold oneself's Tilt. But, restriction can not but shorten length because is space enemy in design side if apply suspension of Leaf spring form used usually in storehouse pickup actuator. But, applied archetype shape's Curved spring at design step because affect immense exercise displacement of required module if design length shortly. Also, posted arrangement of suspension lens holder top and bottom - crossroads other Motion except top and bottom exercise of module reduces phenomenon that appear. Target number of research established that execute drive displacement more than 600μm in 3V that is house voltage that is used in Mobile device that is general. Also, described about maximum transfer displacement characteristic, displacement response characteristic, hysteresis, response characteristic, smallest transfer step characteristic, actuator's drive characteristic that is manufactured to examination item of maximum consumption electric power by special quality estimation system that apply laser displacement sensor that produce itself to evaluate city manufactured actuator's special quality.