Abstract: A physical quantity sensor includes a detection circuit that outputs a detection value indicating a physical quantity applied to a detecting element and a correction processor that corrects the detection value to output a corrected value. The correction processor causes the corrected value to be substantially 0 (zero) if all of conditions that an absolute value of a time-differentiated value of the detection value is not larger than a predetermined differential threshold and that an absolute value of the corrected value is not larger than a predetermined output threshold are satisfied. This physical quantity sensor prevents the output signal from changing due a temperature change in spite of a small number of components.

Abstract: A motion sensor includes a sensor element that outputs a sense signal in response to a motion applied thereto and a sensor circuit that senses the motion based on the sense signal. The sensor circuit includes a sensor-element-signal amplifier that receives the sense signal. The sensor-element-signal amplifier operates switchably between at a normal mode and at a low-noise mode that consumes a larger electric power and produces a smaller noise than the normal mode. This motion sensor senses a small motion and a large motion accurately.

Abstract: A physical quantity sensor includes a detection circuit that outputs a detection value indicating a physical quantity applied to a detecting element and a correction processor that corrects the detection value to output a corrected value. The correction processor causes the corrected value to be substantially 0 (zero) if all of conditions that an absolute value of a time-differentiated value of the detection value is not larger than a predetermined differential threshold and that an absolute value of the corrected value is not larger than a predetermined output threshold are satisfied.

Abstract: A motion sensor includes a sensor element that outputs a sense signal in response to a motion applied thereto and a sensor circuit that senses the motion based on the sense signal. The sensor circuit includes a sensor-element-signal amplifier that receives the sense signal. The sensor-element-signal amplifier operates switchably between at a normal mode and at a low-noise mode that consumes a larger electric power and produces a smaller noise than the normal mode. This motion sensor senses a small motion and a large motion accurately.

Abstract: A sewage treatment apparatus includes a membrane separation active-sludge treating section which performs a biological treatment on a part of sewage, which is introduced by a water introducing section while flowing through a sewer trunk line, to generate first treated sewage; a membrane highly treating section which performs a membrane high treatment on the first treated sewage to generate second treated sewage; a membrane treating tank which stores the first treated sewage; a membrane highly treating tank which stores the second treated sewage; water level sensors which respectively measure water level of the membrane treating tank and the membrane highly treating tank; and a power-control section which controls water introducing quantity of the water introducing section on the basis of the water level data measured by the water level sensors.

Abstract: A sewage reuse system distributes a plurality of reuse water supply sections, each including a water introducing opening formed in a sewer trunk line; a treated sewage tank for storing reuse water; and a water level sensor for measuring a water level of the treated sewage tank, in a demand area of reuse water along the sewer trunk line. The system includes a movable sewage treatment section which moves to any of the plurality of water introducing openings; performs the sewage treatment to generate reuse water; and supplies the generated reuse water to the treated sewage tank, a communication section which transmits the water level data measured by the water level sensor, and a central control section which controls a water storing quantity of the treated sewage tank on the basis of the demand information of reuse water and the water level data.

Abstract: An angular velocity sensor includes a substrate having an upper surface having a first recess provided therein, an electronic component mounted in the first recess, and a vibration element mounted onto the upper surface of the substrate. The first vibration element has a portion located directly above the electronic component. This angular velocity sensor has a small size.

Abstract: The present patent aims to control and adjust water storing quantities of a plurality of treated sewage tanks distributed along a sewer trunk line by a unified management.

Abstract: The present patent aims to control a water storing quantity of reuse water which is stored by a sewage treatment apparatus of a satellite treatment plant.

Abstract: An angular velocity sensor includes a substrate having an upper surface having a first recess provided therein, an electronic component mounted in the first recess, and a vibration element mounted onto the upper surface of the substrate. The first vibration element has a portion located directly above the electronic component. This angular velocity sensor has a small size.

Abstract: A strain sensor improved in detection accuracy without variation of bending stresses applied to the strain detecting element. The sensor substrate has a first fixing hole at one end and a second fixing hole at the other end, a detecting hole at the center, and at least one strain detecting element on the upper surface or lower surface thereof. The first fixing member is press-fitted into the first fixing hole. The second fixing member is press-fitted into the second fixing hole. The detecting member is press-fitted into the detecting hole. Further, when an external force is applied to the detecting member, strain generated due to the positional shift of the detecting member is detected by the strain detecting element with respect to the first fixing member and the second fixing member.

Abstract: A force-on-pedal sensor of the present invention includes a cylindrical substrate (11) whose one end is closed having: a hole part (11d) at a center of its side section (11c); and a strain resistance element (13) via an insulating layer (12) at its side section (11c), a coil spring (15) coaxially inserted from an open end of the substrate (11), an inputting shaft having a stepped part (14a) contacted with one end of the coil spring (15) and inserted in the hole part (11d) in such a manner that a part of the inputting shaft (14) is protruded from the hole part (11d), and a stopper at a position where the inputting shaft (14) is protruded.

Abstract: A force-on-pedal sensor of the present invention includes a cylindrical substrate (11) whose one end is closed having: a hole part (11d) at a center of its side section (11c); and a strain resistance element (13) via an insulating layer (12) at its side section (11c), a coil spring (15) coaxially inserted from an open end of the substrate (11), an inputting shaft having a stepped part (14a) contacted with one end of the coil spring (15) and inserted in the hole part (11d) in such a manner that a part of the inputting shaft (14) is protruded from the hole part (11d), and a stopper at a position where the inputting shaft (14) is protruded.

Abstract: A non-contact position sensor includes a plurality of magnets, at least one magnetic sensor element, and an object to be detected. The plurality of magnets form a magnetic circuit which includes a U-shaped first magnetic body, a U-shaped second magnetic body, and the plurality of magnets. The plurality of magnets are disposed between the two U-shaped magnetic bodies. The magnetic sensor element is held by the two U-shaped magnetic bodies.

Abstract: A non-contact type position sensor enhanced in characteristics. A first magnetic element has a first magnetic detecting part at one end side thereof. A first magnet has one pole thereof fixed to the other side of the first magnetic element. A second magnetic element is positioned underneath the first magnetic element, and has a second magnetic detecting part at one end side thereof, and has the other pole of the first magnet at the other end side thereof. A third magnetic element is positioned substantially on circles concentric with the first magnetic element, and has a third magnetic detecting part at the one end side thereof. A second magnet has one pole fixed to the other end side of the third magnetic element. A fourth magnetic element is positioned underneath the third magnetic element, and has a fourth magnetic detecting part at one end side thereof, and also has the other pole of the second magnet at the other end side thereof.

Abstract: A strain sensor improved in detection accuracy without variation of bending stresses applied to the strain detecting element. The sensor substrate has a first fixing hole at one end and a second fixing hole at the other end, a detecting hole at the center, and at least one strain detecting element on the upper surface or lower surfce thereof. The first fixing member is press-fitted into the first fixing hole. The second fixing member is press-fitted into the second fixing hole. The detecting member is press-fitted into the detecting hole. Further, when an external force is applied to the detecting member, strain generated due to the positional shift of the detecting member is detected by the strain detecting element with respect to the first fixing member and the second fixing member.

Abstract: A position sensor includes a shaft to be detected, a first magnet being fixed to the shaft and having a first polarity vector parallel to an axis of the shaft, a second magnet being disposed opposite to the first magnet and having a second polarity vector crossing the first polarity vector substantially orthogonally three-dimensionally, and first and second semiconductor magnetoresistive elements being disposed over the second magnet and functioning as a magnetoelectric transducer having a magnetosensitive axis substantially orthogonal to the first and second polarity vectors. The first and second elements generate an output responsive to an axial movement of the shaft.

Abstract: The present invention provides an accurate, non-contacting position sensor for an electromagnetic actuator. This position sensor includes a shaft to be detected (1), a first magnet (2) being fixed to the shaft (1) and having a first polarity vector (2a) parallel to an axis of the shaft (1), a second magnet (3) being disposed opposite to the first magnet (2) and having a second polarity vector (3a) crossing the first polarity vector (2a) substantially orthogonally three-dimensionally, and first and second semiconductor magnetoresistive elements (5a, 5b) being disposed over the second magnet (3) and functioning as a magnetoelectric transducer having a magnetosensitive axis substantially orthogonal to the first and second polarity vectors (2a, 3a). The first and second elements (5a,5b) generates an output responsive to an axial movement of the shaft (1).

Abstract: A non-contact position sensor of this invention comprises a magnetic circuit having at least one magnet and a magnetically continuous magnetic body, at least one magnetic sensor element disposed to the magnetic circuit, and an object to be detected positioned in the magnetic circuit. The non-contact position sensor of this invention detects a change in output of the magnetic sensor element caused by rotation or movement of the object to be detected disposed in the magnetic circuit, to measure a position of the object to be detected.

Abstract: A rotational speed-detecting device of the present invention drives a sensor means 11, which includes a detecting unit that connects magneto-electric elements in series. A comparison voltage generator connects comparison voltage resistors in series, and is connected in parallel with the detecting unit, with a constant voltage by a constant-voltage control means 13, to which constant voltage is supplied by a constant-voltage generating means 14. The constant voltage means 14 controls a constant current of the constant-current means 15 with an on-and-off output from a comparison means 12 so as to superpose and flow a rectangular wave current in a power supply line between Vcc and VR.