Abstract: A magnetic detector is disclosed with a power-on function which can essentially eliminate temperature characteristics of a magnetic field sensing device and improve edge detecting accuracy of alternately projected and recessed portions of a moving member of magnetic material. The magnetic detector comprises a magnet for generating a magnetic field, a rotary member of magnetic material disposed with a predetermined gap remaining relative to the magnet and having alternately projected and recessed portions to change the magnetic field generated by the magnet, a magnetoresistive device comprising a plurality of magnetic field sensing elements and detecting changes in the magnetic field by movement of the rotary member of magnetic material, and a magnetic guide for adjusting changes in the magnetic field caused by the alternately projected and recessed portions of the rotary member of magnetic material.

Abstract: A magnetic detector D is disclosed which can perform precise detection even when a moving member of magnetic material is rotating at a very low speed, and can output a signal corresponding to recessed and projected portions of the moving member of magnetic material when the power is turned on and when the rotary member of magnetic material is stopped. The magnetic detector includes a rotary member of magnetic material, a detecting unit for detecting a displacement of the rotary member of magnetic material, an AC coupling circuit for removing a DC component from an output signal of the detecting unit, a comparison circuit for converting an output signal of the AC coupling circuit into a binary signal, an output circuit for outputting an output signal of the comparison circuit, and a variable resistor for setting a comparison level for the comparison circuit to a level between two different signal levels.

Abstract: A magnetic detector is disclosed with a power-on function which can essentially eliminate temperature characteristics of a magnetic field sensing device and improve edge detecting accuracy of alternately projected and recessed portions of a moving member of magnetic material. The magnetic detector comprises a magnet for generating a magnetic field, a rotary member of magnetic material disposed with a predetermined gap remaining relative to the magnet and having alternately projected and recessed portions to change the magnetic field generated by the magnet, and a magnetoresistive device comprising a plurality of magnetic field sensing elements and detecting changes in the magnetic field by movement of the rotary member of magnetic material.

Abstract: A sensing device outputs a square wave signal whose edges exactly correspond to edges of protruding or recessed portions of a rotary magnetic-material member, regardless of the positioning accuracy of a magnetic field detecting element with respect to the location of a magnet. The sensing device includes: a magnet for generating a magnetic field; a rotary magnetic material member for changing the magnetic field generated by the magnet, the rotary magnetic material member being disposed a predetermined distance apart from the magnet; and a magnetic field detecting element whose resistance changes in response to the change in the magnetic field induced by the magnetic field variation inducing means; wherein the surface of the magnet facing the magnetic field detecting element is slanted.

Abstract: A magnetic sensor which can be produced in a small size at low cost with high productivity. The magnetic sensor includes: a main electric circuit; a magnet disposed on said main electric circuit; and a detector unit including an integrated circuit having a magnetic detector unit composed of a sensing resistor for outputting a signal in the form of a voltage change corresponding to the change in the magnetic field of the magnet, and having a filter for removing noise from a signal applied to a processing circuit of the integrated circuit.

Abstract: A magnetic detecting apparatus is capable of performing accurate waveform processing without being affected by noise signals or the like, the level shifting circuit thereof having a fixed voltage shift so as to be free of varying amplitudes of analog signals. Waveform shaping circuitry for turning an analog signal detected from a giant magnetoresistive element into a pulse signal includes: the level shifting circuit for generating an amplified voltage (V1) of analog signals and a voltage (V2) which is higher than the voltage (V1) and a voltage (V3) which is lower than the voltage (V1); a circuit which alternately retains the minimum value of the voltage (V2) and the maximum value of the voltage (V3) as a reference voltage; and a comparator circuit which compares a voltage resulting from adding a hysteresis to the voltage (V1) with the reference voltage and issues a pulse signal.

Abstract: The magnetic sensor comprises a sensor assembly, and a resin molding member surrounding the sensor assembly and defining a housing, the sensor assembly comprising a magnet for generating a magnetic flux, a magnetic core for defining a magnetic circuit, a coil wound around the magnetic core for detecting the change in the magnetic flux flowing through the magnetic core and a support member including a coil bobbin for supporting an assembly of the magnet, the magnetic core and the coil, and the support member comprising an engaging portion which is a surface exposed from the resin molding member for positioning the sensor assembly in a predetermined position during the molding of the resin molding member, so that the sensor assembly can be supported within the resin mold die by the engaging portion between the magnetic core and the coil bobbin or only by the engaging portion of the coil bobbin, so that the stable positioning and support is provided.

Abstract: The magnetic sensor comprises a sensor assembly, and a resin molding member surrounding the sensor assembly and defining a housing, the sensor assembly comprising a magnet for generating a magnetic flux, a magnetic core for defining a magnetic circuit, a coil wound around the magnetic core for detecting the change in the magnetic flux flowing through the magnetic core and a support member including a coil bobbin for supporting an assembly of the magnet, the magnetic core and the coil, and the support member comprising an engaging portion which is a surface exposed from the resin molding member for positioning the sensor assembly in a predetermined position during the molding of the resin molding member, so that the sensor assembly can be supported within the resin mold die by the engaging portion between the magnetic core and the coil bobbin or only by the engaging portion of the coil bobbin, so that the stable positioning and support is provided.

Abstract: A pressure sensor comprising a hollow main body (11) defining a bore (14) extending therethrough and having a detection end and an output end. A pressure sensing assembly is disposed within said bore (14) to divide it into a detection cavity (17) and an output cavity (18) through which output signal lines from said pressure sensing assembly extend. A flexible diaphragm (19) is attached to the detection end of the bore to define a sealed detection cavity (17) in which a pressure transmitting liquid is filled. The pressure sensing assembly comprises support plate (24) welded to said main body (11) and supporting a pressure sensing element (26) within said detection cavity (17) through a mounting bed (4). The signal lines sealingly extend through said support plate (24) from said detection cavity (17) to said output cavity (18).