Objective lens drive device and optical head device
View Patent ↗An objective lens drive device includes a drive mechanism for driving a lens holder at least in a focusing direction and a tracking direction. The drive mechanism includes a drive magnet provided with a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in a roughly U-shape. The drive mechanism also includes a tilt drive coil for driving the lens holder in a tilt direction and the tilt drive coil is opposedly disposed to the magnetized opposing face at a position where the tilt drive coil overlaps with at least a focusing drive coil or a tracking drive coil in a direction in which the focusing drive coil and the tracking drive coil face the magnetized opposing face.
1. An objective lens drive device comprising:
an objective lens;
a lens holder which holds the objective lens;
a fixed side member which supports the lens holder with a plurality of wires in a movable manner; and
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising:
a drive magnet provided with a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in a roughly U-shape;
a focusing drive coil and a tracking drive coil which are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction, the tilt drive coil being opposedly disposed to the magnetized opposing face at a position where the tilt drive coil overlaps with at least the focusing drive coil or the tracking drive coil in a direction in which the focusing drive coil and the tracking drive coil face the magnetized opposing face;
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in a roughly trapezoidal shape having a oblique side part and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane such that both the oblique side parts are adjacent to each other.
2. An objective lens drive device comprising:
an objective lens;
a lens holder which holds the objective lens;
a fixed side member which supports the lens holder with a plurality of wires in a movable manner; and
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising:
a drive magnet provided with a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in a roughly U-shape;
a focusing drive coil and a tracking drive coil which are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction, the tilt drive coil being opposedly disposed to the magnetized opposing face at a position where the tilt drive coil overlaps with at least the focusing drive coil or the tracking drive coil in a direction in which the focusing drive coil and the tracking drive coil face the magnetized opposing face;
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in a roughly trapezoidal shape having a short side part, a long side part and an oblique side part that connects the long side part with the short side part, and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane and disposed such that the long side part of the focusing drive coil is perpendicular to the long side part of the tracking drive coil.
3. An objective lens drive device comprising:
an objective lens;
a lens holder which holds the objective lens;
a fixed side member which supports the lens holder with a plurality of wires in a movable manner;
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising;
a drive magnet provided with a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in a roughly U-shape;
a focusing drive coil and a tracking drive coil which are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction, the tilt drive coil being opposedly disposed to the magnetized opposing face at a position where the tilt drive coil overlaps with at least the focusing drive coil or the tracking drive coil in a direction in which the focusing drive coil and the tracking drive coil face the magnetized opposing face; and
a recessed part provided on a side face of the lens holder for disposing the tilt drive coil; wherein the focusing drive coil is disposed over the recessed part so as to overlap with the tilt drive coil; and
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in a roughly trapezoidal shape having a short side part, a long side part and an oblique side part that connects the long side part to the short side part, and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane and disposed such that the long side part of the focusing drive coil becomes perpendicular to the long side part of the tracking drive coil.
4. The objective lens drive device according to claim 3 ,
wherein the recessed part on which the tilt drive coil is disposed is formed on both sides of a base end side face and a tip end side face of the lens holder, and the tilt drive coil, the focusing drive coil and the tracking drive coil are respectively disposed on both the base end side face and the tip end side face of the lens holder.
5. An objective lens drive device comprising:
an objective lens;
a lens holder that holds the objective lens;
a fixed side member that supports the lens holder with a plurality of wires in a movable manner; and
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising:
a drive magnet having a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in an approximate U-shape;
a focusing drive coil and a tracking drive coil that are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction;
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in an approximate trapezoidal shape having an oblique side part and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane such that both the oblique side parts are adjacent to each other.
6. An objective lens drive device comprising:
an objective lens;
a lens holder that holds the objective lens;
a fixed side member that supports the lens holder with a plurality of wires in a movable manner; and
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising:
a drive magnet having a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in an approximate U-shape;
a focusing drive coil and a tracking drive coil that are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction;
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in an approximate trapezoidal shape having a short side part, a long side part and an oblique side part that connects the long side part with the short side part, and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane such that the long side part of the focusing drive coil is perpendicular to the long side part of the tracking drive coil.
7. An objective lens drive device comprising:
an objective lens;
a lens holder that holds the objective lens;
a fixed side member that supports the lens holder with a plurality of wires in a movable manner; and
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising:
a drive magnet having a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in an approximate U-shape;
a focusing drive coil and a tracking drive coil that are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction; and
a recessed part provided on a side face of the lens holder for disposing the tilt drive coil;
wherein the focusing drive coil is disposed over the recessed part so as to overlap with the tilt drive coil;
wherein the tilt drive coil is opposedly disposed to the magnetized opposing face at a position where the tilt drive coil overlaps with at least the focusing drive coil or the tracking drive coil in a direction in which the focusing drive coil and the tracking drive coil face the magnetized opposing face; and
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in an approximate trapezoidal shape having a short side part, a long side part and an oblique side part that connects the long side part to the short side part, and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane and disposed such that the long side part of the focusing drive coil is perpendicular to the long side part of the tracking drive coil.
8. The objective lens drive device according to claim 7 ,
wherein the recessed part on which the tilt drive coil is disposed is formed on both sides of a base end side face and a tip end side face of the lens holder, and the tilt drive coil, the focusing drive coil and the tracking drive coil are respectively disposed on both the base end side face and the tip end side face of the lens holder.
9. An optical head device comprising:
an objective lens drive device comprising:
an objective lens;
a lens holder which holds the objective lens;
a fixed side member which supports the lens holder with a plurality of wires in a movable manner; and
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising:
a drive magnet provided with a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in a roughly U-shape;
a focusing drive coil and a tracking drive coil which are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction, the tilt drive coil being opposedly disposed to the magnetized opposing face at a position where the tilt drive coil overlaps with at least the focusing drive coil or the tracking drive coil in a direction in which the focusing drive coil and the tracking drive coil face the magnetized opposing face;
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in a roughly trapezoidal shape having a oblique side part and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane such that both the oblique side parts are adjacent to each other.
10. An optical head device comprising:
an objective lens drive device comprising:
an objective lens;
a lens holder which holds the objective lens;
a fixed side member which supports the lens holder with a plurality of wires in a movable manner; and
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising:
a drive magnet provided with a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in a roughly U-shape;
a focusing drive coil and a tracking drive coil which are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction, the tilt drive coil being opposedly disposed to the magnetized opposing face at a position where the tilt drive coil overlaps with at least the focusing drive coil or the tracking drive coil in a direction in which the focusing drive coil and the tracking drive coil face the magnetized opposing face;
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in a roughly trapezoidal shape having a short side part, a long side part and an oblique side part that connects the long side part with the short side part, and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane and disposed such that the long side part of the focusing drive coil is perpendicular to the long side part of the tracking drive coil.
11. An optical head device comprising:
an objective lens drive device comprising:
an objective lens;
a lens holder which holds the objective lens;
a fixed side member which supports the lens holder with a plurality of wires in a movable manner;
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising:
a drive magnet provided with a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in a roughly U-shape;
a focusing drive coil and a tracking drive coil which are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction, the tilt drive coil being opposedly disposed to the magnetized opposing face at a position where the tilt drive coil overlaps with at least the focusing drive coil or the tracking drive coil in a direction in which the focusing drive coil and the tracking drive coil face the magnetized opposing face; and
a recessed part provided on a side face of the lens holder for disposing the tilt drive coil;
wherein the focusing drive coil is disposed over the recessed part so as to overlap with the tilt drive coil; and
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in a roughly trapezoidal shape having a short side part, a long side part and an oblique side part that connects the long side part to the short side part, and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane and disposed such that the long side part of the focusing drive coil becomes perpendicular to the long side part of the tracking drive coil.
12. The optical head device according to claim 11 ,
wherein the recessed part on which the tilt drive coil is disposed is formed on both sides of a base end side face and a tip end side face of the lens holder, and the tilt drive coil, the focusing drive coil and the tracking drive coil are respectively disposed on both the base end side face and the tip end side face of the lens holder.
13. An optical head device comprising:
an objective lens drive device comprising:
an objective lens;
a lens holder that holds the objective lens;
a fixed side member that supports the lens holder with a plurality of wires in a movable manner; and
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising:
a drive magnet having a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in an approximate U-shape;
a focusing drive coil and a tracking drive coil that are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction;
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in an approximate trapezoidal shape having an oblique side part and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane such that both the oblique side parts are adjacent to each other.
14. An optical head device comprising:
an objective lens drive device comprising:
an objective lens;
a lens holder that holds the objective lens;
a fixed side member that supports the lens holder with a plurality of wires in a movable manner; and
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising:
a drive magnet having a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in an approximate U-shape;
a focusing drive coil and a tracking drive coil that are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction;
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in an approximate trapezoidal shape having a short side part, a long side part and an oblique side part that connects the long side part with the short side part, and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane such that the long side part of the focusing drive coil is perpendicular to the long side part of the tracking drive coil.
15. An optical head device comprising:
an objective lens drive device comprising:
an objective lens;
a lens holder that holds the objective lens;
a fixed side member that supports the lens holder with a plurality of wires in a movable manner; and
a drive mechanism for driving the lens holder at least in a focusing direction and a tracking direction, the drive mechanism comprising:
a drive magnet having a magnetized opposing face in which different magnetic poles are disposed to be adjacent to each other via a magnetic pole boundary portion formed in an approximate U-shape;
a focusing drive coil and a tracking drive coil that are opposedly disposed to the magnetized opposing face so as to extend over the magnetic pole boundary portion; and
a tilt drive coil for driving the lens holder in a tilt direction; and
a recessed part provided on a side face of the lens holder for disposing the tilt drive coil;
wherein the focusing drive coil is disposed over the recessed part so as to overlap with the tilt drive coil;
wherein the tilt drive coil is opposedly disposed to the magnetized opposing face at a position where the tilt drive coil overlaps with at least the focusing drive coil or the tracking drive coil in a direction in which the focusing drive coil and the tracking drive coil face the magnetized opposing face; and
wherein the focusing drive coil and the tracking drive coil are respectively formed to be wound around in an approximate trapezoidal shape having a short side part, a long side part and an oblique side part that connects the long side part to the short side part, and the focusing drive coil and the tracking drive coil are disposed on approximately the same plane and disposed such that the long side part of the focusing drive coil is perpendicular to the long side part of the tracking drive coil.
16. The optical head device according to claim 15 ,
wherein the recessed part on which the tilt drive coil is disposed is formed on both sides of a base end side face and a tip end side face of the lens holder, and the tilt drive coil, the focusing drive coil and the tracking drive coil are respectively disposed on both the base end side face and the tip end side face of the lens holder.