Abstract: It is an object of the present invention to provide a pickup device for a stringed instrument which can take a piezoelectric signal for a tone of an acoustic stringed instrument. A stringed instrument is composed of a stringed instrument main body and a sensor mechanism. The stringed instrument main body is composed of one or more strings, a vibration plate used to radiate the vibration of each string as a sound wave, and a sensor mechanism that can make pressure contact with the vibration plate of the stringed instrument main body. The sensor mechanism has fixing means configured to be secured to the stringed instrument main body and a contact sensor member tightly contacted with the vibration plate directly or via an intermediate member.

Abstract: It is an object of the present invention to provide a pickup device for a stringed instrument which can take a piezoelectric signal for a tone of an acoustic stringed instrument. A stringed instrument is composed of a stringed instrument main body and a sensor mechanism. The stringed instrument main body is composed of one or more strings, a vibration plate used to radiate the vibration of each string as a sound wave, and a sensor mechanism that can make pressure contact with the vibration plate of the stringed instrument main body. The sensor mechanism has fixing means configured to be secured to the stringed instrument main body and a contact sensor member tightly contacted with the vibration plate directly or via an intermediate member.

Abstract: There is provided a pickup apparatus for reliably and correctly picking up piano sound by rigidly connecting a sound source member such as a sound board of a piano body, with a stationary member such as a cast-iron plate with use of a pickup apparatus body of the invention to one another so as to pickup the generated vibration force. The pickup apparatus can also be attached to or detached from an existing piano easily and at low cost, and the piano is not damaged when the pickup apparatus is attached to and detached from the piano. Further, noise component which is unnecessary for the piano sound can be eliminated by providing the pickup apparatus body of the present invention with a mechanical vibration filter.

Abstract: Electrolyte ionized water production device wherein voltage is produced or an electrical current is passed, between anode and cathode of an electrolytic cell to which various electrolytes and raw water are supplied after being mixed, and wherein various electrolytes are delivered to an electrolytic cell by use of quantitative pumps and raw water is delivered to said electrolytic cell by use of mechanisms including quantitative pumps or pressure reducing valves, and constant flow valves.