Abstract: A magnetic resonance member 1 includes a crystal structure and is capable of electron spin quantum operations with microwaves of different frequencies corresponding to arrangement orientations of a vacancy and an impurity in a crystal lattice. A magnetic field transmission unit 4 senses a measurement target magnetic field at plural measurement positions different from each other, and applies application magnetic fields corresponding to the measurement target magnetic field sensed at the plural measurement positions to the magnetic resonance member 1 along respective different directions corresponding to the aforementioned arrangement orientations. A measurement control unit 21 controls a high frequency power supply 12, and determines detection values detected by a detecting device (an irradiating device 5 and a light receiving device 6) of the physical phenomena corresponding to the plural measurement positions.

Abstract: A control circuit for controlling a linearly variable speed cooling D.C. fan includes a stator including at least two pairs of main poles, two pairs of auxiliary poles and a Hall effect element provided at either of auxiliary poles. The control circuit also includes a rotor which as a casing, at least two pairs of N and S poles and a plurality of blades. Further, the control circuit includes a driving IC including an amplifier and two switching transistors, a temperature sensor detachable to a connector means, for determining a revolution speed of the D.C. fan that matches to the detected temperature, and a breakdown protection unit provided between said driving IC and said temperature sensor.

Abstract: A piezoelectric loudspeaker having a bending mode piezoelectric diaphragm mounted on a diaphragm stretched across a frame, the piezoelectric diaphragm being supported at its central portion to a support provided at the frame, so that the central portion of piezoelectric diaphragm is stationary free from vibrations, thereby being higher in a sound pressure level and smaller in acoustic distortion than the conventional loudspeaker.