| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform stable position detection even under the condition that transmission efficiency of a light detection sensor including a photo-transistor and photointerrupter changes. <P>SOLUTION: This unit comprises: a lens drive unit in which a lens is stored; a motor which moves the lens drive unit in an optical axis direction; a motor driving part which drives the motor for spherical aberration correction; a light-emitting device which generates light; a photo detector which outputs a current according to the amount of incident light from the light-emitting device; and a light-detection sensor which limits the amount of incident light falling upon the photo detector from the light-emitting device based on the position of the lens drive unit. A resistor which is connected to the photo detector and in which a current flows, is also included. A voltage applied on the resistor (analog voltage) is normalized (normal voltage), based on which a control signal is output to the motor drive to stop the motor. <P>COPYRIGHT: (C)2012,JPO&INPIT |
