Sanyo Electric Co., Ltd.

Shingo Matsuzaki

Shunichi Morimoto

Noboru Tajiri

Mitsuhiko Uchida

Noboru Onojima

Provided is a compact-type objective lens (OBL) holder and the like provided with a bobbin making it possible to appropriately wind a coil therearound. An OBL holder of the present invention includes: a main surface portion provided with a fixing part on which an objective lens is fixed; and a first side-wall portion and a second side-wall portion provided with bobbins around which tracking coils for driving the OBL holder itself by using a magnetic effect are wound. Further, in the present invention, each bobbin includes a tubular portion and a through-hole penetrating the tubular portion in a thickness direction thereof. Thus, an adhesive can be supplied to the tracking coil through the through-hole.

Objective lens holder, objective lens driving device using the same, optical pickup device, and method for manufacturing objective lens driving device

Provided are an objective lens driving device capable of strengthening the effective magnetic fluxes of the magnets while preventing increases in size and costs of the device; and an optical pickup apparatus including the same. The objective lens driving device of the invention includes an actuator frame for movably supporting an OBL holder. Four tracking coils are attached to sidewalls of the OBL holder, and four magnets are attached to the back yokes of the actuator frame to be opposed to the tracking coils, respectively. In addition, two of the tracking coils are placed tilting to one of the sidewalls of the OBL holder.

Objective lens driving device and optical pickup apparatus including the same

Provided are an objective lens holder and the like which prevent a wire formed into tracking coils from being loosened. Tracking coils are respectively attached to bobbins provided to sidewalls of an OBL lens holder. In addition, a conducting wire hook portion is formed by projecting a part of a sidewall portion near one of the bobbins, and a conducting wire is hooked round this conducting wire hook portion. Similarly, another conducting wire hook portion is provided to a sidewall portion near another one of the bobbins, and the conducting wire formed into the corresponding tracking coil is hooked round this conducting wire hook portion. This prevents the conducting wire from being loosened.

Objective lens holder, objective lens driving device and optical pickup apparatus

An objective-lens-driving apparatus comprising: a base opposed to a signal surface of an optical disc; an objective-lens holder including an objective lens, first and second focusing coils arranged across the objective lens in a tracking direction of the disc, first and second tracking coils arranged across the first-focusing coil in a tangential direction of the disc, and third and fourth tracking coils arranged across the second-focusing coil in the tangential direction, the objective-lens holder being supported on the base movably in a focusing direction of the disc and the tracking direction; and first to fourth magnets arranged on the base to be respectively opposed in the tangential direction to the first to fourth tracking coils, the first and second magnets each having two poles polarized in the tracking direction, magnetization widths of the two poles with respect to the first-focusing coil in the tracking direction being different from each other.

Growing community of inventors

Gunma, Japan

Shingo Matsuzaki