Patent ID: 7206145

Claim:
A lens driving device for moving a lens in an optical-axis direction thereof to detect a predetermined original position of said lens, said lens driving device comprising: a lens holder for holding said lens, said lens holder having a cylindrical shape and integrally moving with said lens; a rotary barrel disposed so as to cover a circumferential surface of said lens holder, said rotary barrel being rotated around an optical axis of said lens to move said lens holder in said optical-axis direction; a barrel holder for rotatably holding said rotary barrel from an outer side thereof; a reflection member disposed on the circumferential surface of said lens holder, said reflection member having different reflectance relative to a surrounding portion thereof; an opening formed in said barrel holder, said opening being formed at a position confronting said reflection member at a time when said lens is set to said original position; and an optical position detector disposed so as to be adjacent to said opening, said optical position detector optically detecting said reflection member via said opening when said lens has reached the original position.