Abstract: To improve the characteristics of a portion which can be represented by an approximate first-order line (so-called linearity) in the relation between pressure and diaphragm displacement. To equalize the pressure-applying area/volume of a diaphragm when plural ring-shaped reinforcement ribs are in contact with said cover (no load condition when no pressure is applied to the diaphragm) and the pressure-applying area/volume of a diaphragm when said diaphragm is apart from said cover (the diaphragm is displaced due to pressure load).

Abstract: The present invention is a displacement sensor, which is capable of keeping high sensing resolution even if the amount of displacement of the core and the amount of changing the inductance are small. In the displacement sensor of the present invention, a displacing body is capable of displacing according to external force. An LC resonance circuit includes a magnetic coil and a core made of a magnetizable material, which is capable of moving close to and away from the magnetic coil according to the displacement of the displacing body. An oscillator inputs continuous signals having prescribed frequency to the LC resonance circuit. A detecting circuit detects the amount of the displacement of the displacing body on the basis of amplitude of the continuous signals from the LC resonance circuit.

Abstract: A sensor having a wide sensing range is capable of being controll by a small scale processor. The sensor comprises: a plurality of planar zigzag coils being provided on substrates, the planar zigzag coils having the same coil pitch and being formed into zigzag shape in a first direction, the planar zigzag coils being capable of relative movement in the first direction, the planar zigzag coils including a first planar zigzag coil, which is a primary coil, and a second planar zigzag coil, which is a secondary coil; a magnetizing unit for magnetizing the first planar zigzag coil; a first detecting unit for detecting induced electromotive force, which is induced in the second planar zigzag coil by the first magnetized planar zigzag coil; and a second detecting unit for detecting displacement length between the first planar zigzag coil and the second planar zigzag coil on the basis of the induced electromotive force in the second planar zigzag coil.

Abstract: An object of the present invention is to provide a water electrolyzer, which has higher electrolyzing efficiency and smaller size than conventional ones. In an electrolyzing tank, at least three cylindrical electrodes, each of which has different polarity with respect to adjacent one, are arranged concentrically with cylindrical partitions. Surface area of the one cylindrical electrode, which is provided between other two, is equal to the sum of surface area of an outer face of the inner cylindrical electrode and that of an inner face of the outer cylindrical electrodes, so that maximum electrolyzing efficiency can be gained.

Abstract: In the water electrolyzer, an electrolyzing section has electrodes for electrolyzing raw water. The water pressure sensor detects pressure of raw water introduced into the electrolyzing section. A driver circuit adjusts electric power supplied to the electrodes. A microprocessor controls the driver circuit to adjust electric power supplied to the electrodes on the basis of water pressure detected by the water pressure sensor so as to maintain the pH value of the electrolyzed water in a prescribed range. With this structure, the pH value of the electrolyzed water can be maintained in the prescribed range without reference to quantity of water in the electrolyzing section.

Abstract: The present invention relates to a solenoid device such as a flow control valve and a displacement sensor. In a conventional solenoid device, it is not possible to get characteristic curve for easy control of the input voltage to an electromagnetic coil and the stroke of a plunger, or the stroke of a plunger and the frequency of a coil. Thus, it is difficult to control, land the stroke of the plunger is short. Therefore, in the present invention, the above stated disadvantages are solved by forming the end section of the plunger tapered, so that an electromagnetic valve having linear characteristic curve and longstroke plunger or a highly precise displacement sensor can be provided.