Abstract: An adaptive work table-reciprocation control system and method that can reduce a grinding time. The system uses a vibration sensor head installed on a chuck surface in the vicinity of the workpiece to detect a vibration signal emitted from the contact zone between the grinding wheel and the workpiece. When the value of the vibration signals falls below a trigger level, a work table direction of motion is reversed.

Abstract: An adaptive work table-reciprocation control system and method that can reduce a grinding time. The system uses a vibration sensor head installed on a chuck surface in the vicinity of the workpiece to detect a vibration signal emitted from the contact zone between the grinding wheel and the workpiece. When the value of the vibration signals falls below a trigger level, a work table direction of motion is reversed.

Abstract: In a loudspeaker system of the present invention, a plurality of flat loudspeaker units are arranged and fixed linearly in the longitudinal direction of an elongated opening provided at a side portion of a cabinet to form a base unit. In such a manner, a series of sound sources extending linearly can be achieved, and at the same time, sounds output from the flat loudspeaker units are synthesized to thereby increase the energy. Accordingly, a listener can listen to sounds under the same condition anywhere along the cabinet. Moreover, the loudspeaker system of the present invention has an effect in that the sound is not perceived as noisy even in a position close to the loudspeaker while the sound is perceived as clearly in a position far from the loudspeaker as it is perceived in the closer position.