Hitachi, Ltd.

Ricoh Company, Ltd.

Dong-Ju Lee

No-Cheol Park

Shigeo Nakamura

Takeshi Shimano

Irizo Naniwa

Chul Han Park

Goichi Akanuma

Masaya Horino

Jeonghoon Yoo

Myeong-Gyu Song

Yang-Hyun Seok

Jeseung Oh

An objective lens drive apparatus configured to drive an objective lens that focuses a laser beam on an optical disk is disclosed, the apparatus including a holding member that holds the objective lens; at least one pair of drive magnets arranged to face each other at opposite sides of the holding member with respect a tangential direction that is parallel to a tangential line of the optical disk, the drive magnets having protruding end portions that protrude from each side of the holding member with respect to a tracking direction that is parallel to a radial direction of the optical disk; and plural drive coils configured to drive the holding member through interaction with the drive magnets, at least one of the drive coils being arranged on each side of the drive magnets with respect to the tangential direction.

Objective lens drive apparatus where interaction of drive magnets and drive coils drive a holding member that holds the objective lens and optical pickup and optical disk apparatus including the same

A small-sized optical disc drive includes one voice coil motor magnet within which a tracking coil and two focusing coils are disposed such that the tracking coil straddles the two poles of permanent magnets that are adjacently disposed. The two focusing coils are disposed on either side of the tracking coil, with each of the two focusing coils being only disposed over one of the permanent magnets.

Optical disc drive

Growing community of inventors

Seoul, South Korea

Dong-Ju Lee