Abstract: A bearing holder and a spindle motor having the same are disclosed. The bearing holder in accordance with an embodiment of the present invention can include a body, which has an insertion hole formed therein such that a bearing is inserted into the insertion hole, a first supporting protrusion, which is protruded downward from a bottom surface of the body along a circumference of the insertion hole, and a first bent indentation, which is formed on an inner circumferential surface of the first supporting protrusion such that the first supporting protrusion is bent toward an inner side. Thus, unnecessary deformation in the bearing holder can be prevented while the bearing holder is coupled to a base plate. Moreover, since the bearing holder forms an accurate positional relationship with respect to the base plate, noise and vibration can be prevented from occurring during the operation of the motor.

Abstract: A bearing holder and a spindle motor having the same are disclosed. The bearing holder in accordance with an embodiment of the present invention can include a body, which has an insertion hole formed therein such that a bearing is inserted into the insertion hole, a first supporting protrusion, which is protruded downward from a bottom surface of the body along a circumference of the insertion hole, and a first bent indentation, which is formed on an inner circumferential surface of the first supporting protrusion such that the first supporting protrusion is bent toward an inner side. Thus, unnecessary deformation in the bearing holder can be prevented while the bearing holder is coupled to a base plate. Moreover, since the bearing holder forms an accurate positional relationship with respect to the base plate, noise and vibration can be prevented from occurring during the operation of the motor.

Abstract: Disclosed herein is a brushless DC motor. The brushless DC motor includes a rotating shaft, a bearing, an integrated washer holder, a rotor casing, a stator and a support plate. The bearing rotatably supports the rotating shaft in the radial direction. The integrated washer holder supports the lower end of the rotating shaft and the circumferential outer surface of the bearing. The rotor casing integrally rotates along with the rotating shaft. A rotor magnet is attached to the inner surface of the rotor casing. The stator is provided around the circumferential outer surface of the integrated washer holder such that the stator faces the rotor magnet. Thus, when external electric power is applied to the stator, the rotor casing is rotated by reciprocal action between the stator and the rotor magnet. The integrated washer holder is mounted to the support plate.

Abstract: Disclosed are a fibroin with increased molecular weight and improved antioxidant activity, tyrosinase inhibitory ability and cytotoxicity to cancer cells, which has a molecular structure modified by irradiation, a method for production thereof, use of the irradiated fibroin in various applications for enhancing antioxidant activity, tyrosinase inhibitory ability and/or cytotoxicity to cancer cells such as foods, cosmetics, medicines, etc.

Abstract: Disclosed are sericin having improved antioxidant and tyrosinase inhibitory abilities and increased molecular weight by irradiation, which causes a modification of a sericin molecular structure, a preparation method thereof and use of the irradiated sericin in various applications including food products, cosmetics and/or pharmaceutical products and medicines to improve antioxidant ability and/or tyrosinase inhibitory functions.

Abstract: Disclosed is a method for producing demineralized bone matrix with improvement of releasing bone morphogenetic protein by irradiating the demineralized bone matrix, the demineralized bone matrix produced by the producing method, a method for extracting bone morphogenetic protein using the demineralized bone matrix, and the bone morphogenetic protein extracted by the extracting method. The demineralized bone matrix produced according to the present invention and the bone morphogenetic protein extracted by using the demineralized bone matrix can be advantageously used in manufacturing bone restorative implants, bone growth accelerating compositions, and/or health aids or supplementary food products.

Abstract: A color wheel unit and a fabrication method thereof are disclosed. The color wheel unit comprises a color wheel positioned on a light path and having RGB segments, which are rotated to be inserted in order into the light path, and a driving apparatus for providing rotational force to the color wheel, where the color wheel is secured to the driving apparatus by laser welding. This allows a simplified process for joining the color wheel to the driving apparatus.