Abstract: A fan includes an impeller portion generating an air flow and a motor that rotates the impeller portion about a center axis. The impeller portion is attached to a yoke of a rotor portion of the motor and is rotated with the yoke. A circular portion of the impeller is attached to a bottom opening of the yoke having a cylindrical shape whose top is covered by insert molding. Therefore, the impeller and the yoke may be securely fixed to each other. In addition, an outer side surface of the yoke is exposed to outside air such that the space arranged inward from the plurality of blades may be enlarged.

Abstract: A motor according to the present invention preferably includes a boss portion preferably includes an inner ring portion including a substantially ring shaped convex portion at an axially lower end surface thereof. The boss portion preferably includes a through hole at which a shaft is press fitted at a central portion thereof. A rotor holder including a substantially cylindrical shape includes a through hole centered about a rotary axis. The through hole and the inner ring portion of the boss portion are fitted to one another. The convex portion includes a portion plastically deformed outwardly in the radial direction to sandwich an inner circumferential surface of the rotor holder. The inner circumferential surface of the impeller cup portion includes a plurality of convex portions near an upper portion thereof. The rotor holder is press fitted into the inner circumferential surface of the impeller cup portion via the convex portions.

Abstract: An arrangement of a low air inlet and a circuit for driving a torque generator in an ultra-compact centrifugal fan is disclosed. In the ultra-compact centrifugal fan, a region occupied by the circuit is not completely arranged radially inside a cup-shaped portion to which an impeller is attached. At least a part of the low air inlet provided on a bottom of a housing of the centrifugal fan is arranged in a range of predetermined angle in an imaginary ring-shaped portion surrounding a base portion covered by the cup-shaped portion. A part of the circuit, that is not covered by the cup-shaped portion, is arranged upstream of the range of the predetermined angle in a flowing direction of airflow.

Abstract: A motor according to the present invention includes a boss portion 34 preferably includes an inner ring portion 342 having at an axially lower end surface thereof a substantially ring shaped convex portion 3421. The boss portion 34 preferably includes at a central portion thereof a through hole at which a shaft 32 is press fitted. A rotor holder 31 having a substantially cylindrical shape includes a through hole 321 centered about a rotary axis. The through hole 321 and the inner ring portion 342 of the boss portion 34 are fitted to one another. The convex portion 3421 includes a portion plastically deformed outwardly in the radial direction so as to sandwich an inner circumferential surface 3211 of the rotor holder 31. The inner circumferential surface of the impeller cup portion 22 includes a plurality of convex portions 221 near an upper portion thereof. The rotor holder 31 is press into the inner circumferential surface of the impeller cup portion via the convex portions 221.

Abstract: A fan includes an impeller portion generating an air flow and a motor that rotates the impeller portion about a center axis. The impeller portion is attached to a yoke of a rotor portion of the motor and is rotated with the yoke. A circular portion of the impeller is attached to a bottom opening of the yoke having a cylindrical shape whose top is covered by insert molding. Therefore, the impeller and the yoke may be securely fixed to each other. In addition, an outer side surface of the yoke is exposed to outside air such that the space arranged inward from the plurality of blades may be enlarged.

Abstract: An arrangement of a low air inlet and a circuit for driving a torque generator in an ultra-compact centrifugal fan is disclosed. In the ultra-compact centrifugal fan, a region occupied by the circuit is not completely arranged radially inside a cup-shaped portion to which an impeller is attached. At least a part of the low air inlet provided on a bottom of a housing of the centrifugal fan is arranged in a range of predetermined angle in an imaginary ring-shaped portion surrounding a base portion covered by the cup-shaped portion. A part of the circuit, that is not covered by the cup-shaped portion, is arranged upstream of the range of the predetermined angle in a flowing direction of airflow.

Abstract: The centrifugal fan includes an impeller for producing the flow of air by rotation, and a motor for rotating the impeller. The impeller includes a plurality of main blades and a plurality of auxiliary blades. In the centrifugal fan, the turbulent flow of air flowing near the outer surface of the cup part is suppressed and the noise of the centrifugal fan is reduced by connecting the auxiliary blades to the outer surface of the cup part. An opening passing through with respect to the center axis direction is formed between two adjacent auxiliary wings, and the opening end on the lower side of the opening is inclined towards a stator side, whereby some air that flowed to the outer surface efficiently flows into the cup part, thereby supplying air to the stator and suppressing temperature rise of the stator.

Abstract: A fan assembly includes an impeller portion generating an air flow and a motor that rotates the impeller portion about a center axis. The impeller portion is attached to a yoke of a rotor portion of the motor and is rotated with the yoke. A circular portion of the impeller is attached to a bottom opening of the yoke having a cylindrical shape whose top is covered by insert molding. Therefore, the impeller and the yoke may be securely fixed to each other. In addition, an outer side surface of the yoke is exposed to outside air such that the space arranged inward from the plurality of blades may be enlarged.

Abstract: To provide a reflection sheet, using a thinner, lower stiffness film, for use in surrounding a straight tube type fluorescent lamp in an edge type liquid crystal display panel back light device, which reflection sheet can realize a higher brightness of the back light device. A reflection sheet comprising: a film support having a thickness of 25 to 50 &mgr;m and, applied on a surface of the support, a reflective paint coat comprised of a mixture of a resin binder of a (meth)acrylate copolymer with a small particle balloon having a particle diameter of 0.05 to 10 &mgr;m and an inside empty diameter to particle diameter ratio of 0.2 to 0.9.

Abstract: A flexible carrier tape for storage and delivery of components by an advancement mechanism, comprises a strip portion, a plurality of aligned pockets spaced along the strip portion for carrying the components, a layer of a static dissipative acrylic polymer on the strip portion, and a cover releasably, adhesively bonded to the strip portion and covering the plurality of pockets. The acrylic polymer may also be used to reduce the temperature at which the cover is bonded to the strip portion.