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US 2004/0165492 A1Published application
Optical pickup
AssigneeFunai Electric Co., Ltd.
InventorTsutomu Matsui
Life of this patent
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Abstract
An optical pickup includes a lens holder body having a first surface and a second surface opposing to each other, tracking coils, a focusing coil, and tilt coils which are formed on a pair of flat panels respectively disposed on the first and second surfaces, and first and second magnetic bodies respectively disposed to face the first and second surfaces of the lens holder body and each constituting a planar closed magnetic circuit.
Claims7
An optical pickup having a tilting function, comprising:
- a lens holder body having a first surface and a second surface opposing to each other;
- first and second magnetic bodies respectively disposed to face the first surface and the second surface, each of the first magnetic body and the second magnetic body having a substantially rectangular first area polarized with a first pole and a second area disposed substantially in a U-shape in a plan view around the first area and polarized with a second pole, each of the first magnetic body and the second magnetic body constituting a planar closed magnetic circuit;
- flat panels respectively disposed on the first surface and the second surface, each of the flat panels having a pair of tracking coils, a focusing coil and a pair of tilt coils formed thereon by etching;
- and
- an inclination detector including a pair of optical sensors disposed below the lens holder body, the inclination detector detecting an inclination of the lens holder body on the basis of a differential output of the pair of optical sensors;
- wherein the first area of each of the first magnetic body and the second magnetic body is formed in such a manner as to project laterally from a lower end on both sides;
- the pair of tracking coils are disposed planarly so as to respectively overlap two vertical boundaries between the first area and the second area of each of the first magnetic body and the second magnetic body;
- the focusing coil is disposed planarly so as to overlap a horizontal boundary between the first area and the second area of each of the first magnetic body and the second magnetic body;
- and
- the pair of tilt coils are disposed planarly on both sides of the focusing coil so as to overlap the horizontal boundary between the first area and the second area of each of the first magnetic body and the second magnetic body.
7 more elements
An optical pickup comprising:
- a lens holder body having a first surface and a second surface opposing to each other, each of the first surface and the second surface having a tracking coil, a focusing coil and a tilt coil;
- and
- first and second magnetic bodies respectively disposed to face the first surface and the second surface, each of the first magnetic body and the second magnetic body having a substantially rectangular first area polarized with a first pole and a second area disposed substantially in a U-shape in a plan view around the first area and polarized with a second pole, each of the first magnetic body and the second magnetic body constituting a planar closed magnetic circuit;
- wherein the tracking coil is disposed planarly so as to overlap at least one of two vertical boundaries between the first area and the second area of each of the first magnetic body and the second magnetic body;
- the focusing coil is disposed planarly so as to overlap a horizontal boundary between the first area and the second area of each of the first magnetic body and the second magnetic body;
- and
- the tilt coil is disposed planarly so as to overlap the horizontal boundary between the first area and the second area of each of the first magnetic body and the second magnetic body.
4 more elements
Dependencies are inferred from the claim text.