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 relates to a polishing apparatus for restoring an optical disk. The objects of the present invention are as follows: to obtain an equal pressure appropriately required for polishing; to correct the accuracy of parallelism between the rotation planes of an optical disk and a polishing sheet; to remove roundness formed on the outer edge of an optical disk and unevenness in polishing; and to prevent clogging of the surface of a polishing sheet by the active elimination of abrasive filings and an occurrence of scratches on the surface of an optical disk due to the clogging. For the purpose of achieving the above objects, in an apparatus for polishing an optical disk composed of a disk rotator A and a polishing mechanism B, the polishing mechanism B has an elastic mechanism D for elastically holding a polishing pad C, a polishing sheet of the polishing pad C has such an elasticity that the deformation amount ?x is 0.005 mm to 0.

Abstract: In an apparatus for trapping and killing insects using an electric discharge between electrodes to count and/or kill insects or the like, the present invention presents a technology to almost certainly count and/or kill the insects or the like even when the applied voltage is set low. In an insect-trapping/killing apparatus as an embodiment of the invention, when an insect or the like enters the space between an outer electrode and a central electrode, an electric discharge passes through the insect or the like, whereby the insects or the like is killed. After that, the central electrode is rotated in a preset direction to remove the insect or the like downwards by the frictional force. Since the removing mechanism as described above solves the problem of the clogging of the space between electrodes by the insect or the like, the distance between the electrodes can be set as small as the size of the body of the insect or the like, and the applied voltage can be set accordingly low.

Abstract: An apparatus for use in training or playing in various shooting games, such as for a golf approach shot, baseball batting, or gun shooting. A target screen is provided opposite to a shooting point from which a ball or the like is shot out. Four microphones are provided at the circumference of the target screen to detect the collision sound, and another microphone is set at the shooting point to detect the shooting sound of the ball. The duration of flight of the ball, and the collision point on the screen, and the trajectory of the flying ball, are calculated by analyzing the detection time points of each microphone in a control part. The results, i.e., collision point on the target screen, flying trajectory of the ball, etc., are shown on a display unit.