Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Phc Holdings Corporation

Akihito Shirai

Naoshi Kainoh

Junichi Nakamura

Shigeo Obata

Yosei Yoshikawa

Tomohiro Haga

Takeshi Hatakeyama

Youichi Nishimoto

Kazuya Kakutani

Yoichi Nishimoto

Kazunori Maekawa

The present disclosure provides an electrode substrate including an insulating substrate having, on a surface thereof, a region where at least one fine uneven structure is formed and a plurality of smooth regions separated by the fine uneven structure; and a conductive thin film formed on the entire of at least one surface of the insulating substrate where the fine uneven structure is formed. According to the present disclosure, the conductive region and the insulating region can be simultaneously formed on the insulating substrate only by forming the conductive thin film in a single step on the entire surface of the single insulating substrate on which the fine uneven structure is formed.

Electrode substrate, method for manufacturing same, and biosensor using electrode substrate

A spindle motor rotatably drives recording discs, and includes a base plate, a stator, a rotor hub, a yoke, a rotor magnet, and a hydrodynamic bearing. The hub includes a disc support cylindrical portion for supporting the recording discs in the radial direction, an annular disc mount portion formed on an outer circumference of the cylindrical portion for mounting the recording discs thereon, and an annular projection formed on the lower portion of the disc mount portion in the axial direction and having an outer circumference to which the yoke is fixed. The disc mount portion is formed with an annular non-contact surface formed on the upper portion in the axial direction, and an annular disc receiving face formed around an outer circumference of the non-contact surface and upward of the non-contact surface in the axial direction for being in contact with the recording disc in the axial direction.

Spindle motor with flange land portion for ensuring flatness of recording disc

An annular groove is provided to the rotary portion and/or the fixed portion in a bearing seal portion, and its cross section has a shape approximated by an arc. The annular groove is such that the relationship between the groove width W in a direction following the surface constituting a bearing seal portion and the groove depth Dg in a direction perpendicular to the surface constituting the bearing seal portion is Dg/W&#x3c;0.4.

Hydrodynamic bearing device, spindle motor, and recording and reproducing apparatus

The object of the present invention is to provide a hydrodynamic bearing, a method for manufacturing the same, and a spindle motor, with which the gap in the axial direction required for the smooth operation of a bearing can be sufficiently ensured. A method for manufacturing a hydrodynamic bearing comprising a shaft, a sleeve attached so as to be capable of relative rotation with respect to the shaft, a first flange unitfixed to or integrated with the shaft, and a second flange unit fixed to the shaft, the method comprising at least inserting the shaft into the sleeve, and inserting the shaft into the second flange unit, pressing the top face of the second flange unit in the axial direction, and fixing the second flange unit to the shaft by welding the shaft and the second flange unit while maintaining the pressing state.

Hydrodynamic bearing and method for manufacturing the same, and spindle motor and method for manufacturing the same

A low-profile motor includes a rotor yoke having a rotor magnet on its inner or outer surface and being rotationally supported on a motor base via a shaft, and a stator core constituted of a plurality of T-shaped winding parts each having an end opposed to the rotor magnet. On the motor base formed with a hole for supporting the rotor yoke via the shaft, the plurality of T-shaped winding parts are cut like tongues along the radial direction of the hole, and the T-shaped winding parts are each bent such that their ends are opposed to the rotor magnet. Thus, it is possible to readily form the T-shaped winding parts, eliminate the need for mounting the T-shaped winding parts, and reduce the number of parts and steps. This technique enables it to efficiently form an inexpensive low-profile motor for a magnetic disk unit and the like.

Low profile motor

A hydrodynamic bearing device which can improve workability of injecting a lube repellant and effectively prevent leakage of a lubricant, a method for manufacturing the same, a spindle motor, and a recording and reproduction apparatus are provided. A hydrodynamic bearing deviceincludes a lube repellantwhich is applied in a circular shape by a predetermined distance in a radial direction from a portion of an upper surface of a second thrust flangewhere it is connected to a shaftand a lube repellantwhich is applied in a circular shape on an outer peripheral surface of the second thrust flangebelow from an upper end in the radial direction by a predetermined distance. The lube repellantis applied near the upper end portion in a gap formed between the outer peripheral surface of the second thrust flangeand an inner peripheral surface of an outer sleeve

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Ehime, Japan

Akihito Shirai