Pioneer Corporation

Kazutaka Goami

Jun Suzuki

Eiji Kuroki

Shinichi Fujinoki

Shigeru Takaya

Shigeyuki Sasanuma

Yoshiya Usami

An objective lens driving device is provided with an objective lens; a lens holder for holding the objective lens; a pair of linear suspension springs for supporting the lens holder at each one end; a spring holder whereupon the other ends the springs are fixed; and a driving means for at least driving the objective lens in a tracking direction together with the lens holder. The linear suspension springs have narrowed or widened end compared with the other end in plan view from an optical axis direction. The lens holder is supported to be driven in the tracking direction, by having the cross point of the two lines, which pass the suspension spring ends on one side and are vertical to the extending directions of the linear suspension springs, respectively, at the driving center.

Objective lens driving apparatus, optical pickup, and information recording/reproducing apparatus

A stopperincludes a projected portionfor restricting movement of a movable section in a focusing direction and a wall sectionfor restricting movement of the movable section in a tracking direction, the projected portionand the wall sectionbeing integrally formed from a synthetic resin. With the arrangement, a single stoppercan simultaneously restrict the movements of the movable section both in the focusing direction and the tracking direction and determine its movable ranges. Accordingly, unlike conventional arrangements, discrete stoppers for the focusing direction and the tracking direction do not have to be provided, thereby reducing the number of components and cost as well as facilitating mounting operation. In addition, even when a strong impact is applied, the stopper will not be deformed.

Optical pick up apparatus

A lens driving apparatus including a fixing member; a moving member which is movably provided with respect to the fixing member; an objective lens which is held by the movable member; a connecting member which elastically connects the fixing member to the movable member, wherein the connecting member includes first to fourth wire members which are arranged in a shape to be widened narrowed toward ends of the first to fourth wire members.

Lens driving apparatus

A magnet used for an actuator of an optical pickup has a magnetization pattern has two different pole areas adjacent with each other. At a corner part defined by the boundary line of the two pole areas, the pole area inside the corner part has a projection area, projecting in the direction of the pole area outside the corner part. Owing to the existence of the projection area, insufficiency of the magnetic flux density at the corner part particularly close to the vertex can be improved so that a desirable magnetic field can be provided to the printed coil substrate disposed in the vicinity of the magnet.

Magnet for actuator, actuator, and magnetizing device

A magnet used for an actuator of an optical pickup has a magnetization pattern with two different pole areas adjacent each other. At a corner part defined by the boundary line of the two pole areas, the pole area inside the corner part has a projection area, projecting in the direction of the pole area outside the corner part. Owing to the existence of the projection area, insufficiency of the magnetic flux density at the corner part particularly close to the vertex can be improved so that a desirable magnetic field can be provided to the printed coil substrate disposed in the vicinity of the magnet.

Actuator for an optical pickup

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.

An optical pickup apparatus () is provided with: a carriage body (); an optical parts accommodation module () mounted on said carriage body and accommodating at least (i) a light beam emitting portion () for emitting a light beam, (ii) a light beam receiving portion (), (iii) a beam splitter () and (iv) a grating () 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 () 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. The grating adjustment mechanism has a cam plane () abut to an abut plane () formed at a portion apart from the axis line and including a slide cam member () mounted in such a condition that said slide cam member is regulated to be movable on a straight line with respect to said carriage body.

Growing community of inventors

Tokorozawa, Japan

Kazutaka Goami