Mitsubishi Denki Kabushiki Kaisha

Ichiro Togo

Yasuyoshi Hatazawa

Yasuaki Hata

A magnetic sensor having a coil that is not damaged by the injection pressure of a molten resin. The magnetic sensor includes a bobbin having a winding core and flanges, a supporting element connected to the bobbin, a coil for detecting a change in the magnetic field as a change in voltage, the coil including a winding wire wound around the winding core, an output lead wire of the coil being drawn out through an output lead slot formed in one of the flanges, and a housing covering outer portions of the bobbin, coil, and supporting element, wherein the output lead wire is drawn out through the output lead slot at a height, measured in a radial direction of the bobbin, which is substantially equal to a height of an outer surface of an adjacent portion of the supporting element.

Magnetic sensor with supporting element for supporting output lead wire

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.

Magnetic sensor with bobbin, sleeve and terminal bed for detecting a

Magnetic sensor having an engaging portion

A magnetic pickup sensor comprising a sensor assembly 11 and a molded resin housing 12 disposed around the assembly. The sensor assembly has a pickup coil 15 wound around an iron core 14 for detecting a change in the magnetic flux of a magnet 13, and a support unit including a coil bobbin 18 and a spacer 20 for supporting the magnet and core assembly. The iron core has one end 14 a projecting outwardly from the molded resin, and the spacer of the support unit has a positioning recess 23 for engagement by a positioning pin 30 of a mold die. Therefore, the sensor assembly can be accurately positioned and held within the mold die during molding of the housing.

Method for manufacturing magnetic pickup sensor

A magnetic pickup sensor which includes a sensor assembly 11 and a molded resin housing 12 disposed around the assembly. The sensor assembly has a pickup coil 15 wound around an iron core 14 for detecting a change in the magnetic flux of a magnet 13, and a support unit including a coil bobbin 18 and a spacer 20 for supporting the magnet and core assembly. The iron core has one end 14a projecting outwardly from the molded resin, and the spacer of the support unit has a positioning recess 23 for engagement by a positioning pin 30 of a mold die. Therefore, the sensor assembly can be accurately positioned and held within the mold die during molding of the housing.

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Himeji, Japan

Ichiro Togo