Abstract: There is provided a hydrodynamic bearing assembly including: a sleeve against which a shaft is supported so that an upper end of the shaft, being compressed and inserted into a hub base of a rotor case, protrudes upwardly in an axial direction; a first thrust dynamic pressure generating part formed in at least one of a protrusion and the hub base corresponding to the protrusion, the protrusion being formed at an end of the sleeve along an inner diameter direction; and a second thrust dynamic pressure generating part formed around a protruding end portion of the sleeve, the protruding end portion facing an upper portion of a stopper part in the axial direction and the stopper part rotating together with the rotor case. Also, an oil sealing part has an oil interface between an outer circumferential surface of the sleeve along an outer diameter direction and an inner surface of the stopper part.

Abstract: Disclosed is a device for inspecting a bonded wafer using laser, which has a simple structure to facilitate an operation of the device and can detect an interface defect of the bonded wafer economically and highly reliably. To this end, the device for inspecting the bonded wafer using laser includes a laser unit, a laser diffusion unit, and a detection unit. If the device of inspecting the bonded wafer using laser according to the present invention is used, it is possible to advantageously inspect a wafer interface at a magnification desired by an inspector. In addition, the device has a simple structure, and thus it is advantageously easy to operate the device.

Abstract: Disclosed herein is a highly-durable electrode tool for electrochemical machining, which can prevent the corrosion and abrasion of a conductive pattern at the time of electrochemical machining for forming dynamic pressure-generating grooves of a fluid dynamic bearing, and a method of manufacturing the same. The electrode tool for electrochemical machining includes: an electrode substrate on which a conductive pattern is formed to have protrusions corresponding to the fine grooves and to which negative current is applied; a nonconductive insulating layer, covering an entire top surface of the electrode substrate excluding the conductive pattern; and a conductive layer, which is formed on the conductive pattern to protect the conductive pattern, and a top surface of which is the same height as a top surface of the nonconductive insulating layer.

Abstract: An apparatus and method for providing IPTV broadcasting contents information is provided. The apparatus and method is capable of easily providing a user terminal with related information that is associated with IPTV broadcasting content contents. The apparatus includes a content generator configured to generate an IPTV broadcasting content by use of a broadcasting content and a Quick Response (QR) code including related information that is associated with the broadcasting content, and a transmitter configured to transmit the IPTV broadcasting content.

Abstract: Disclosed herein is a method of manufacturing a hydrodynamic bearing in which a metal bearing made of sintered metal powder is internally subjected to chemical etching, to form hydrodynamic pressure grooves thereon, thus assuring a high-precision and reliable hydrodynamic bearing. The method includes: compressing metal powder that is a raw material of the bearing in a press unit, and sintering the compressed metal powder at a predetermined temperature, thus preparing a sintered bearing; removing foreign substances adhering to the sintered bearing through a deburring process, and pressing the sintered bearing into a desired shape; forming a hydrodynamic groove, configured to generate hydrodynamic pressure, on an internal surface of the shaped bearing using chemical etching; and conducting a post treatment of cleaning the bearing including the hydrodynamic grooves thereon and drying the bearing.

Abstract: Provided is a bonded wafer inspection method using a laser method allowing a simple and reliable test in an examination of a bonded wafer interface using a laser. To do this, a laser used bonded wafer inspection method includes, emitting a laser beam through a laser means, diffusing the emitted laser beam by a laser diffusion means, illuminating the diffused laser beam on a bonded wafer, and detecting a laser beam illuminated and transmitted at the bonded wafer using a detecting means. In a case a bonded wafer inspection method using a laser of the invention is used, defects by a foreign substance occurring at an interface of a bonded wafer is can be examined in a simple way and thus high work performance may be expected.

Abstract: There is provided a hydrodynamic bearing assembly including: a sleeve against which a shaft is supported so that an upper end of the shaft, being compressed and inserted into a hub base of a rotor case, protrudes upwardly in an axial direction; a first thrust dynamic pressure generating part formed in at least one of a protrusion and the hub base corresponding to the protrusion, the protrusion being formed at an end of the sleeve along an inner diameter direction; and a second thrust dynamic pressure generating part formed around a protruding end portion of the sleeve, the protruding end portion facing an upper portion of a stopper part in the axial direction and the stopper part rotating together with the rotor case. Also, an oil sealing part has an oil interface between an outer circumferential surface of the sleeve along an outer diameter direction and an inner surface of the stopper part.

Abstract: The present disclosure is relate to an image comparison device using a personal video recorder, the device comprising a display unit configured to output a reference image, at least one camera configured to obtain a comparison image by taking a picture of a present scene of a subject for photography chasing a movement of an object included in the reference image while the reference image is displayed on the screen of the display unit, and a controller configured to display the comparison image with the reference image on the screen, and a method using the an image comparison device.

Abstract: Disclosed herein is a method of manufacturing a hydrodynamic bearing in which a metal bearing made of sintered metal powder is internally subjected to chemical etching, to form hydrodynamic pressure grooves thereon, thus assuring a high-precision and reliable hydrodynamic bearing. The method includes: compressing metal powder that is a raw material of the bearing in a press unit, and sintering the compressed metal powder at a predetermined temperature, thus preparing a sintered bearing; removing foreign substances adhering to the sintered bearing through a deburring process, and pressing the sintered bearing into a desired shape; forming a hydrodynamic groove, configured to generate hydrodynamic pressure, on an internal surface of the shaped bearing using chemical etching; and conducting a post treatment of cleaning the bearing including the hydrodynamic grooves thereon and drying the bearing.

Abstract: Disclosed herein is a highly-durable electrode tool for electrochemical machining, which can prevent the corrosion and abrasion of a conductive pattern at the time of electrochemical machining for forming dynamic pressure-generating grooves of a fluid dynamic bearing, and a method of manufacturing the same. The electrode tool for electrochemical machining includes: an electrode substrate on which a conductive pattern is formed to have protrusions corresponding to the fine grooves and to which negative current is applied; a nonconductive insulating layer, covering an entire top surface of the electrode substrate excluding the conductive pattern; and a conductive layer, which is formed on the conductive pattern to protect the conductive pattern, and a top surface of which is the same height as a top surface of the nonconductive insulating layer.