Abstract: A sun-tracking photovoltaic power generation system with a rotating a base having a plurality of photovoltaic power generation panels loaded thereon closely to each other following changes in the solar azimuth angle. A plurality of rails are concentrically laid on an undersurface of the base and wheels are provided to a stand closer to the ground. As a result, it is easier to support the wheels on the same horizontal plane than laying the rails horizontally on a large installation space. Therefore, the construction cost can be reduced and the construction period can be shortened, thereby achieving a large sun-tracking photovoltaic power generation system. Also, because the base is concentrically reinforced by the plurality of rails, the base can be formed by combining, for example, metal L angles, so that a base with a large area can be made light weight at a low cost.

Abstract: After a scratch 160 or similar defect formed on the readout surface of an optical disc is nearly completely removed by grinding and polishing the readout surface with surface with a grinding/polishing agent or similar compound, the readout surface is coated with a coating agent 170 made of a transparent resin or similar material. In this process, a significant change in the thickness of the optical disc before and after the restoration can be prevented by controlling the grind/polishing and coating processes so that the decrease in the thickness due to the grinding/polishing is nearly equal to the increase in the thickness due to the application of the coating agent 170. Therefore, even a Blu-ray Disc or similar optical disc having only a small distance from the surface to the information record layer can be restored many times.

Abstract: An optical disk restoration apparatus and optical disk restoration method are provided, which are capable of achieving a high level of capability of restoring a scratched optical disk, without consuming the time and labor of an operator, while reducing the production cost of the apparatus. During a polishing process, an appropriate amount of a polishing agent is dropped onto the readout surface of the optical disk by a polishing agent supply pump to continuously supply the polishing agent to the interface between the optical disk and polishing pads, while a polishing water supply pump is operated to replenish the polishing agent with moisture evaporated by the polishing heat. By this mechanism, the amount and physical properties of the polishing agent at the interface between the optical disk and the polishing pads are appropriately maintained for a long period of time, so that the restoration capability is maintained at high levels.

Abstract: An optical disk polishing device which includes: a disk holder for rotatably holding an optical disk, the disk holder installed in a lower fixed portion; a cylindrical buff disposed in parallel with the surface of the optical disk and perpendicular to a rotary shaft of the disk holder in an offset manner; a drive motor to rotate the buff; and an upper opening-and-closing portion normally urged to an open state to the lower fixed portion by a spring or other member. The device makes it possible to clean a readout surface of the optical disk in a short period of time, and to be offered at a low price owing to the simple and small-sized structure thereof.

Abstract: An optical disk restoration apparatus and optical disk restoration method are provided, which are capable of achieving a high level of capability of restoring a scratched optical disk, without consuming the time and labor of an operator, while reducing the production cost of the apparatus. During a polishing process, an appropriate amount of a polishing agent is dropped onto the readout surface of the optical disk by a polishing agent supply pump to continuously supply the polishing agent to the interface between the optical disk and polishing pads, while a polishing water supply pump is operated to replenish the polishing agent with moisture evaporated by the polishing heat. By this mechanism, the amount and physical properties of the polishing agent at the interface between the optical disk and the polishing pads are appropriately maintained for a long period of time, so that the restoration capability is maintained at high levels.

Abstract: The present invention intends to provide a water purification apparatus that is small and easy-to-use, yet being capable of efficiently creating flocs of impurities and removing the impurities from the wastewater in a single pass. To achieve this objective, an inner tubular anode 12 made of stainless steel or carbon is inserted into an outer tubular cathode 11 made of aluminum, leaving a predetermined intermediate space 13 between them, and electrolysis is carried out to produce aluminum hydroxide. The aluminum hydroxide thus produced serves as the medium for flocculating the impurities in the wastewater ascending the intermediate space 13. The wastewater containing the flocs of impurities is filtrated with a filter 18 within a filtering and settling tank 17. As a result, the impurities are completely removed from the wastewater.

Abstract: The present invention intends to provide an optical disk restoration apparatus that is simple structured and small sized to reduce the production cost, and that can evenly apply a substantially uniform pressing force. This object can be achieved by an optical disk restoration apparatus, including a turntable 41 on which an optical disk 10 is set via a non-slip sheet 45, a polishing body holder 47 for holding a polishing body 46, a pressing mechanism for pressing the polishing body 46 and the optical disk 10 onto each other with a predetermined pressure required for the polishing process, and a motor 48 for rotating at least the polishing holder 47 and the polishing body 46 to polish the surface of the optical disk 10, where the surface of the turntable 41 and/or the sheet 45 is provided with at least one of an inclined, step-like or curved profile.

Abstract: An optical disk polishing device which includes: a disk holder for rotatably holding an optical disk 11, the disk holder installed in a lower fixed portion 10; a cylindrical buff disposed in parallel with the surface of the optical disk 11 and perpendicular to a rotary shaft of the disk holder in an offset manner; a drive motor to rotate the buff 21; and an upper opening-and-closing portion 20 normally urged to an open state to the lower fixed portion 10 by a spring or other member. The device makes it possible to clean a readout surface of the optical disk in a short period of time, and to be offered at a low price owing to the simple and small-sized structure thereof.

Abstract: The present invention intends to provide a water purification apparatus that is small and easy-to-use, yet being capable of efficiently creating flocs of impurities and removing the impurities from the wastewater in a single pass. To achieve this objective, an inner tubular anode 12 made of stainless steel or carbon is inserted into an outer tubular cathode 11 made of aluminum, leaving a predetermined intermediate space 13 between them, and electrolysis is carried out to produce aluminum hydroxide. The aluminum hydroxide thus produced serves as the medium for flocculating the impurities in the wastewater ascending the intermediate space 13. The wastewater containing the flocs of impurities is filtrated with a filter 18 within a filtering and settling tank 17. As a result, the impurities are completely removed from the wastewater.

Abstract: The present invention intends to provide an optical disk restoration apparatus that is simple structured and small sized to reduce the production cost, and that can evenly apply a substantially uniform pressing force. This object can be achieved by an optical disk restoration apparatus, including a turntable 41 on which an optical disk 10 is set via a non-slip sheet 45, a polishing body holder 47 for holding a polishing body 46, a pressing mechanism for pressing the polishing body 46 and the optical disk 10 onto each other with a predetermined pressure required for the polishing process, and a motor 48 for rotating at least the polishing holder 47 and the polishing body 46 to polish the surface of the optical disk 10, where the surface of the turntable 41 and/or the sheet 45 is provided with at least one of an inclined, step-like or curved profile.