Abstract: A lens driving apparatus for driving a movable body in a focus direction and a tracking direction is provided with: a holder, to which a focus coil, a tracking coil and a lens are installed, to thereby constitute the movable body; and a magnetic circuit for applying magnetic fluxes to the focus coil and the tracking coil, to thereby drive the movable body in the focus direction and the tracking direction. The tracking coil includes two sets each having upper and lower two coils arrayed in the focus direction such that the two sets are arrayed in the tracking direction. The magnetic circuit applies the magnetic fluxes opposite to each other along a jitter direction, with respect to the upper two coils and the lower two coils without applying the magnetic fluxes with respect to portions adjacent to the upper and lower two coils.

Abstract: An optical pickup apparatus (100) is provided with: a carriage body (80); an optical parts accommodation module (70) mounted on said carriage body and accommodating at least (i) a light beam emitting portion (41, 42, 55) for emitting a light beam, (ii) a light beam receiving portion (57, 65), (iii) a beam splitter (44) and (iv) a grating (43) for generating a sub beam for a tracking adjustment out of the light beam emitted from said light beam emitting portion; and a grating adjustment mechanism (62, 63) for rotating said optical parts accommodation module. The optical parts accommodation module is mounted on said carriage body in such a condition that said optical parts accommodation module is allowed to rotate with an axis line of the light beam, which is irradiated toward a disc, as a rotational center.

Abstract: A lens driving apparatus for driving a movable body in a focus direction and a tracking direction is provided with: a holder, to which a focus coil, a tracking coil and a lens are installed, to thereby constitute the movable body; and a magnetic circuit for applying magnetic fluxes to the focus coil and the tracking coil, to thereby drive the movable body in the focus direction and the tracking direction. The tracking coil includes two sets each having upper and lower two coils arrayed in the focus direction such that the two sets are arrayed in the tracking direction. The magnetic circuit applies the magnetic fluxes opposite to each other along a jitter direction, with respect to the upper two coils and the lower two coils without applying the magnetic fluxes with respect to portions adjacent to the upper and lower two coils.

Abstract: An optical pickup apparatus (100) is provided with: a carriage body (80); an optical parts accommodation module (70) mounted on said carriage body and accommodating at least (i) a light beam emitting portion (41, 42, 55) for emitting a light bean, (ii) a light beam receiving portion (57, 65), (iii) a beam splitter (44) and (iv) a grating (43) for generating a sub beam for a tracking adjustment out of the light beam emitted from said light beam emitting portion; and a grating adjustment mechanism (62, 63) for rotating said optical parts accommodation module. The optical parts accommodation module is mounted on said carriage body in such a condition that said optical parts accommodation module is allowed to rotate with an axis line of the light beam, which is irradiated toward a disc, as a rotational center.

Abstract: There is provided an objective lens driving device, wherein a lens holder for holding an objective lens and a coil unit is connected with and floatingly supported by a base block using a plurality of elongate flexible metal members. The objective lens driving device is formed by positioning a plurality of elongate flexible metal members at the predetermined positions with respect to the lens holder and the base block which are to be formed, forming the lens holder integrally connected with one end of each elongate flexible metal member, forming the base block integrally connected with the other end of each elongate flexible metal member, attaching the objective lens and the coil unit in the lens holder.

Abstract: There is provided an optical pickup which comprises a light source, an objective lens for converging a beam from the light source onto an optical disc, a diffraction grating for passing a beam returning from the optical disc, a photo-detector for receiving returning beams passing through the diffraction grating. The diffraction grating is divided into two areas, each area including alternatively arranged first diffraction grating pattern and second diffraction grating pattern.

Abstract: An optical pickup magneto-optically records information on a magneto optical disc in cooperation with a magnetic head. The optical pickup is disposed at one surface side of the magneto optical disc while the magnetic head is disposed at the other surface side of the magneto optical disc during a recording operation of the magneto optical disc. The optical pickup is provided with: a light emission device for emitting a light beam; an optical system for guiding the emitted light beam; an objective lens for converging and focusing the guided light beam onto the optical disc; and an actuator holding the objective lens and having a magnetic circuit for actuating the objective lens to move in focusing and tracking directions respectively of the magneto optical disc by a magnetic force generated by the magnetic circuit.

Abstract: An optical pickup device includes an objective lens assembly including an objective lens facing a surface of an optical disk, an actuator base supporting the objective lens to be movable, and a body in which an optical element is accommodated, the actuator base being supported by the body to be slidable. The actuator base is provided with a first flat portion positioned in a vicinity of the optical disk surface and a second flat portion apart from the optical disk surface, the first and second flat portions being formed with first and second protruded pieces having spherical end surfaces, and the body is formed with first and second receiving portions against which the first and second protruded pieces abut, respectively. The optical body is composed of a first supporting portion for supporting the first flat portion, a second supporting portion for supporting the second flat portion and an intermediate portion disposed below the first flat portion.