Objective lens driving unit, and optical pickup device and optical disc drive including the objective lens driving unit

An objective lens driving unit for an optical disc drive, the objective lens driving unit comprising:

• a moving structure comprising an objective lens and a driving coil;
• a yoke structure comprising a magnet corresponding to the driving coil, a yoke supporting the magnet, and a fixed portion extending from the yoke;
• a wire holder comprising a first surface and a second surface that is adjacent to the first surface, wherein the fixed portion of the yoke structure is integrally bonded to the first surface by molding, and a terminal unit comprising a plurality of interconnection layers is embedded in the second surface;
• and
• a plurality of suspension wires that connect the driving coil to the terminal unit of the wire holder, wherein
• the terminal unit comprises a terminal substrate that is embedded and fixed in the wire holder, and the interconnection layers are formed on the terminal substrate.

An optical pickup device comprising:

• a moving structure comprising an objective lens and a driving coil;
• a static structure comprising:
• a yoke structure comprising a magnet corresponding to the driving coil, a yoke supporting the magnet, and a fixed portion extending from the yoke,
• a wire holder comprising a first surface and a second surface that is adjacent to the first surface, wherein the fixed portion of the yoke structure is integrally formed by molding on the first surface and a terminal unit comprising a plurality of interconnection layers is embedded in the second surface, and
• a plurality of suspension wires connecting the driving coil to the interconnection layers;
• and
• a base that supports the static structure and which comprises a light source and a light-receiving device, wherein
• an opening is formed on the first surface of the wire holder in which the fixed portion of the yoke structure is embedded and the opening exposes the fixed portion.

An objective lens driving device for an optical disc drive, the device comprising:

• a wire holder comprising a first surface and a second surface that is adjacent to the first surface;
• a terminal unit comprising a plurality of interconnection layers, the terminal unit configured to be embedded in the second surface;
• and
• a yoke configured to support a magnet, driving coil, and objective lens of the driving device, to be integrally bonded to the first surface of the wire holder by molding, and to extend beyond the second surface of the wire holder and make contact with one of the interconnection layers of the terminal unit.