A fluid dynamic bearing device which exhibits high bearing performance at low cost has a highly accurate bearing gap. At least a region in the outer circumferential surface of a shaft, which faces the radial bearing gap, is constituted of an electroformed part, and the region of the shaft excluding the electroformed part is constituted of a resin portion.

Fluid dynamic bearing device

An illumination apparatus comprises an illuminant configured to radiate diffused light from an outgoing plane and a light guiding member. The light guiding member includes an incident end which is close to the outgoing plane of the illuminant and on which the diffused light is incident, an outgoing end from which the incident light which was incident on the incident end is emitted, and which has an area larger than that of the incident end, and a tapered portion which is positioned between the incident end and the outgoing end, and which has a tapered reflective surface transmitting the incident light to the outgoing end while reflecting the incident light. The illumination apparatus further comprises a holding member configured to integrally hold the illuminant and the light guiding member.

Illumination apparatus and display apparatus using the illumination apparatus

A stator portion of a spindle motor includes a substantially cup-shaped base member including a bottom portion expanding in a radial direction, and a wall portion extending upwards from an outer edge portion of the bottom portion. A circuit board is fixed to a lower surface of the base member in a position on the outer side in the radial direction and on the upper side than the bottom portion. Accordingly, the thickness of the spindle motor in the axial direction can be reduced. The base member has a through hole formed axially through the bottom portion. An opening edge portion of the base member is covered with the insulating layer. A conducting wire from a coil is drawn through the through hole, led out along the surface of the insulating layer, and connected to the circuit board positioned on the outer side in the radial direction than the bottom portion. Accordingly, the conducting wire can be led to the circuit board while the electric connection between the conducting wire and the opening edge portion can be prevented.

Spindle motor and disk drive apparatus

A spindle motor includes a base portion, a rotor hub, a stator, and a circuit board. The base portion preferably includes a through hole and is arranged to spread out radially around a central axis. The rotor hub is arranged above the base portion to rotate about the central axis. The stator is arranged above the base portion, and includes coils each including at least one lead wire. The circuit board is arranged radially outward of the through hole, and arranged on a lower surface of the base portion. The base portion includes a communicating groove arranged to join the through hole and the circuit board to each other. The at least one lead wire of the coils is arranged to pass inside the through hole and the communicating groove to be electrically connected to the circuit board. The through hole is sealed with a sealant.

Spindle motor having connecting mechanism connecting lead wire and circuit board, and storage disk drive having the same

A dynamic pressure bearing device enabling the prevention of the deterioration of accuracy in its assembling and the lowering of strength and also enabling a reduction in cost. A guide face (2c) used as a guide when a disk hub (3) is press-fitted onto a shaft member (2) is formed on the shaft member. Then, the guide face (2c), the outer peripheral surface (2a3) of the shaft member (2) adjacent to the guide face (2c), and a boundary part between the guide face (2c) and the outer peripheral surface (2a3) are simultaneously ground to form an obtuse part (2d) with radius (r) at the boundary part. Since edges between the guide face (2c) and the outer peripheral surface (2a3) are eliminated, a press-fitting resistance produced when the disk hub is press-fitted onto the shaft end of the shaft member (2) can be reduced.

Dynamic pressure bearing device

PROBLEM TO BE SOLVED: To provide a coil yoke for motors for reducing cogging, while suppressing man-hours and cost for manufacturing and a motor to provide a rotting device. SOLUTION: This coil yoke for motors is provided with a plurality of winding parts 42 where a plurality of thin-plate-shaped pieces in a specific shape are laminated and a coil is wound, and a gear tooth 43 where a plurality of thin- plate shaped small pieces in a specific shape are laminated, the magnetic path of magnetic force by a coil 43 as well as the winding parts 42 is formed, and a rotating magnetic field formed. Also, the gear tooth 43 is provided with a first projecting part 43b that projects in the rotary direction of the rotating magnetic field and a projecting part 43c, that projects in a direction opposite to that of the rotation and is connected to the winding parts 42, that are separately formed from the winding parts 42. COPYRIGHT: (C)2001,JPO

Coil yoke for motor, the motor, and rotating device

PROBLEM TO BE SOLVED: To reduce mutual interference of an axial dynamic pressure part and a radial dynamic pressure part on a ring liquid dynamic pressure bearing. SOLUTION: Ring spaces 8, 9 to reserve lubricating oil for generation of dynamic pressure are provided along a neighbouring part of a radial dynamic pressure bearing part and an axial dynamic pressure bearing part formed between a ring 3 and a bearing part 5 and negative pressure is not generated in a boundary region of both of the dynamic pressure bearing parts in a ring liquid dynamic pressure bearing 1 constituted as a shaft part 4 constituted with the ring 3 fixed on an end part 2A of a shaft main body 2 supported by the bearing part 5. COPYRIGHT: (C)2000,JPO

Liquid dynamic pressure bearing and the spindle motor

PROBLEM TO BE SOLVED: To provide a spindle motor and a rotor device easy to manufacture and capable of suppressing axial and radial oscillation to an extremely small degree by preventing the generation of a half-whirling phenomenon. SOLUTION: A spindle motor and a rotor device comprises a motor frame 11, a rotor 13, a stator 14, a motor coil 15, a permanent magnet 16 and a liquid dynamic pressure bearing A. The liquid dynamic pressure bearing A comprises a rotary shaft 12, a housing 11a and a ferrule 18. A thrust bearing part 12a of the rotary shaft 12 is accommodated in a cylindrical hole 11a1 of the housing 11a, and a radial bearing part 12b of the rotary shaft 12 is accommodated in a cylindrical hole 11a2 to fill lubricating oil, and a ferrule 17 is press-fixed into a cylindrical hole 11a4. A boss part 13a of the rotor 13 is press-fixed into a supporting shaft 12c of the rotary shaft in the state of the end face of the boss part 13a being brought into contact with the step part end face of the rotary shaft 12 so that the magnetic center in the direction of the rotary shaft 12 in the magnet 16 provided at the rotor 13 almost coincides with the. magnetic center in the direction of the rotary shaft 12 in the stator 14 and the coil 15.

Spindle motor and rotor device

PROBLEM TO BE SOLVED: To shorten the forming process of the dynamic grooves of a ring member and to reduce the product cost in a fluid dynamic pressure bearing having a flanged shaft constituted of the ring member formed with the thrust dynamic pressure grooves on the upper face and the lower face and the radial dynamic pressure grooves on the outer periphery respectively and a columnar member. SOLUTION: A blank ring 3a formed with annular notches W at edge sections is prepared in a preparation process (a). The radial dynamic pressure grooves G1 are formed on the blank ring 3a in a radial dynamic pressure groove forming process (b), The columnar member 2 is inserted into a half-machined ring 3b in a thrust dynamic pressure groove forming process (c), the half-machined ring 3b is arranged in a sizing ring H, a thrust groove machining die is set in a preparation stage, then the thrust groove machining die is pressed by a press machine, the thrust dynamic pressure grooves are formed on the upper face and the lower face of the half-machined ring 3b, and the pressing-in of the columnar member 2 is completed. The bulges of the edge portions of the half-machined ring 3b by pressing can be absorbed by the annular notches W, and the conventional post-process is eliminated.

Fluid dynamic pressure bearing and spindle motor

PURPOSE: To provide a supporting mechanism for a rod integrator which does not have property fluctuation caused by heat. CONSTITUTION: Aperture parts 12 and 13 are holed on the side surface of a hollow member 2, and a bridge 14 for screwing the screw 10 for fixing a leaf spring 11 is provided between the parts 12 and 13. Masks 8 and 9 are superposed and attached on both ends of the member 2. At least the incident surface 6 of the mask 9 is polished to be in the condition of a mirror surface or in the condition near to that. The materials of the masks 8 and 9 are the materials having high heat resistance. In the case of assembling, the masks 8 and 9 are fixed on both ends of the member 2, and the rod integrator 1 is inserted in the member 2. The leaf spring 11 is placed on the side surface of the rod integrator 1 from the parts 12 and 13 holed on the side surface of the member 2, and the leaf spring 11 is fixed on the bridge 14 by a set screw 10. The leaf spring 11 is elastically deformed to give pressing force to the side surface of the rod integrator 1. The shape of the leaf spring 11 is decided so as not to make the pressing force influence the optical property of the rod integrator 1.

Kawada Naoki

Papers

Coil yoke for motor, the motor, and rotating device

Liquid dynamic pressure bearing and the spindle motor

Spindle motor and rotor device

Fluid dynamic pressure bearing and spindle motor

Supporting mechanism for rod integrator