Abstract: A current sensor includes a busbar through which a measured current flows, a magnetic detector that detect a magnetic field generated by the measured current, a casing that holds the busbar, a first magnetic shield that reduces disturbance magnetic field noise applied to the magnetic detector, a substrate having the magnetic detector on its surface on one side in a first direction perpendicular to second and third directions perpendicular to each other, where the busbar, magnetic detector, substrate, and first magnetic shield are disposed in this order from the one side in the first direction, and a spacer portion provided between the casing and substrate to separate the busbar from the magnetic detector in the first direction. The substrate has a protruding portion protruding from a position where the substrate is held by the spacer portion in at least one of protruding directions that are the second and third direction.

Abstract: A current sensor which suppresses deterioration of detection accuracy caused by high temperature of electronic components due to heat of a bus bar and is suitable for measurement of large current includes a bus bar through which a current to be measured flows, a magnetic detector detecting a magnetic field generated by the bus bar, and a case integrally formed with the bus bar and having a storage space storing the magnetic detector. The magnetic detector is spaced away from and faces the bus bar. The bus bar is on a first surface of the storage space defining the storage space and facing the magnetic detector. A low thermal conductivity material having a lower thermal conductivity than a resin-based material forming the case is provided between the bus bar and the magnetic detector to contact an opposing surface, on the bus bar, facing the magnetic detector.

Abstract: A current sensor includes busbars through which a current to be measured flows, magnetic detectors capable of detecting a magnetic field generated when the current to be measured flows through the busbars, a storage space storing the magnetic detectors, and a housing with which part of the busbars is integrated. Ends of the busbars are connected to an external first unit including a cooling device, and other ends of the busbars are connected to an external second unit whose temperature becomes higher than that of the first unit when the current to be measured flows. In the current sensor, which is capable of measuring a current value of the current to be measured from a result of the detection performed by the magnetic detectors, the housing has first vents penetrating from the inside of the storage space to the outside on a side facing the first unit.

Abstract: A current sensor includes a magnetic sensor configured to detect a magnetic field generated by a current to be measured flowing through a current path and a shielding member including a first shield, a second shield, and a third shield disposed away from each other. The first shield is disposed on an opposite side of the current path from the magnetic sensor in a first direction in which the magnetic sensor and the current path oppose each other and includes a first opposing surface opposing the current path. The second shield includes a second opposing surface along the first direction. The third shield includes a third opposing surface along the first direction. The second shield and the third shield are disposed such that the second opposing surface and the third opposing surface oppose each other, with the magnetic sensor and the current path sandwiched therebetween.

Abstract: A current sensor has: a bus bar extending in a first direction; a magnetic shield having a portion that faces the bus bar along a third direction; a magnetic sensor facing the bus bar along the third direction on an opposite side of the bus bar to a side on which the magnetic shield is placed; and a case molded integrally with part of the bus bar. The magnetic shield has: a U-shaped portion that has a bottom wall including a portion that faces the bus bar along the third direction and also has two side walls, facing each other in the second direction, that is erected in the third direction from ends of the bottom wall in a second direction; an attachment portion that is adjoined to the U-shaped portion and is fixed to the case; and a link portion that links the U-shaped portion and attachment portion together.

Abstract: A current detection device includes a plurality of current detection units arranged in the current detection device. Each of the current detection units includes a bus bar that enables a current to be measured to flow therethrough, a magnetic sensor disposed at a position facing the bus bar, and a pair of shields disposed so as to sandwich the bus bar and the magnetic sensor in a facing direction in which the bus bar and the magnetic sensor face each other. The bus bars of the plurality of current detection units extend so as to be aligned to one another and, as viewed in the facing direction, the positions of the shield and the magnetic sensor of each of the current detection units in an extension direction of the bus bars differ from the positions of the shield and the magnetic sensor of the adjacent current detection unit.

Abstract: A current sensor includes units each of which has a bus bar through which current flows, a magnetic sensor facing one of plate surfaces of the bus bar, a shield facing the other plate surface. The units have a large-current unit and a small-current unit. A first distance between the bus bar and the magnetic sensor in a normal direction of the plate surfaces of the bus bar is the same as a distance L1A of the large-current unit and a distance L1B of the small-current unit. Since, as for a second distance between the bus bar and a base of the shield, a distance L2A of the large-current unit is larger than a distance L2B of the small-current unit, a measurement range of the large-current unit is widened and a measurement error due to magnetic saturation of the shield is suppressed.

Abstract: A current sensor includes a busbar extending in a direction, a magnetic sensor facing the busbar in a direction intersecting the direction in which the busbar extends, a magnetic shield having a base that faces the busbar, at least a portion of the base facing a side of the busbar opposite to a side where the magnetic sensor is disposed, and a case having an insert-molded section in which at least a part of the magnetic shield is insert-molded. The insert-molded section has holes (first holes), and in the holes (first holes), some portions of the magnetic shield are exposed as exposure portions (first exposure portions) and the exposure portions (first exposure portions) have rust-prevention properties. Such a current sensor has the rustproofed exposure portions and thus problems caused by rusting in the exposure portions in the magnetic shield can be prevented or reduced.

Abstract: A current sensor has a chassis, a magnetism detection element, and a bus bar through which a current under measurement flows. The current sensor is mounted on a circuit board in a state in which the chassis is inserted into an opening formed in the circuit board with current paths provided on a mounting surface and the bus bar is connected to the current paths. The bus bar has an incorporation portion placed in the interior of the chassis as well as externally connected portions extending from both ends of the incorporation portion, one from each side, toward the outside of the chassis. The externally connected portions are positioned above the bottom surface of the chassis in the up-down direction. The incorporation portion has an underneath portion positioned below the externally connected portions in the up-down direction.

Abstract: In a current detection device, a first shield plate is disposed adjacent to a magnetic sensor and a second shield plate is disposed adjacent to the bus bar so that the first and second shield plates sandwich the bus bar and the magnetic sensor in the thickness direction of the bus bar. A plurality of the first shield plates adjacent to the magnetic sensors are an integral part of a cover. At least part of the cover is separated between adjacent two of the first shield plates, and a plurality of the second shield plates disposed adjacent to the bus bars are an integral part of a casing.

Abstract: A current sensor has a bus bar through which a current under measurement flows, a magnetism sensing portion placed so as to face the bus bar in an X direction, and a chassis that incorporates the magnetism sensing portion and part of the bus bar. In a Y direction orthogonal to the X direction, the bus bar has a first connection end protruding from a Y1 side of the chassis and a second connection end protruding from a Y2 side of the chassis. The first connection end and second connection end are at different positions in the X direction when viewed from a Z direction orthogonal to the X direction and Y direction. An opposing portion, facing the magnetism sensing portion, of the bus bar crosses the Y direction when viewed from the Z direction.

Abstract: A magnetic sensor is configured such that, even if noise is generated from a bus bar at ON-OFF switching of a voltage for controlling the current to be measured flowing through the bus bar, the influence of the noise on the result of measurement made by the magnetic sensor can be reduced. The magnetic sensor includes a main body having two opposing sides, the main body being capable of measuring a value of a current to be measured flowing through a bus bar by detecting a magnetic field induced by the current to be measured, wherein a signal terminal for outputting a detection signal and a supply terminal for supplying electrical power to the main body extend only from one of the two sides of the main body.

Abstract: A current sensor has a first bus bar, a second bus bar, and a third bus bar, which are formed in a plate shape, and also has a first magnetic sensing unit, a second magnetic sensing unit, and a third magnetic sensing unit placed so as to respectively face the first bus bar, second bus bar, and third bus bar. Each bus bar has a narrow-width portion with the relevant magnetic sensing unit placed so as to face it, and also has two wide-width portions. The second magnetic sensing unit, which senses a magnetic field generated from the second bus bar, and the third magnetic sensing unit, which senses a magnetic field generated from the third bus bar, are offset from their relevant narrow-width portions toward opposite sides in the Y-axis direction, when viewed along the Z-axis direction.

Abstract: A current sensor capable of efficiently cooling a busbar by using a cooling device includes a busbar, a shield disposed to face the busbar, a magnetic sensor disposed between the shield and the busbar, and an enclosure that integrally encases part of the busbar, the shield, and the magnetic sensor. When a side on which the busbar is disposed in the X-axis direction in which the busbar, the magnetic sensor, and the shield are arranged is defined as an X1 side, the busbar is disposed on the X1 side from the center line of the enclosure, and at least the X1 side of the enclosure is disposed to face the cooling device.

Abstract: A current detecting device has: a bus bar through which a current under measurement flows; a fastening member for fastening an external member to the bus bar; a chassis formed integrally with the bus bar and a shield, the chassis holding the bus bar and fastening member in a mutual contact state; and a magnetic sensor placed so as to face the bus bar, the magnetic sensor being capable of detecting a magnetic field generated when the current under measurement flows through the bus bar. The bus bar has a fastening terminal portion on the same side as an end of the bus bar, the fastening terminal portion being in contact with the external member. A connection surface is provided so as to be exposed from the chassis, the connection surface being a surface through which the fastening terminal portion is brought into contact with the external member.

Abstract: A current sensor according to the present invention that measures a current to be measured flowing through a busbar includes a sensing section that is capable of detecting a magnetic field generated by flow of the current to be measured through the busbar. The current flowing in the busbar is measured based on a change in the magnetic field detected by the sensing section. The sensing section is inserted into a through-hole of the busbar that penetrates the busbar in a thickness direction of the busbar, and a direction of an axis of detection of the magnetic field performed by the sensing section extends in a direction of the insertion into the through-hole.

Abstract: A tire wear measuring device that detects wear of a tire based on a magnetic field from a magnetic object embedded in the tire includes magnetic sensors and a battery. The battery is capable of transmitting the magnetic field from the magnetic object, and has an outer edge from which the magnetic field from the magnetic object is emitted as an emission magnetic field. Each of the magnetic sensors is disposed in a position where the emission magnetic field is detectable by the sensor.

Abstract: A current sensor includes a magnetic sensor configured to detect a magnetic field generated by a current to be measured flowing through a current path and a shielding member including a first shield, a second shield, and a third shield disposed away from each other. The first shield is disposed on an opposite side of the current path from the magnetic sensor in a first direction in which the magnetic sensor and the current path oppose each other and includes a first opposing surface opposing the current path. The second shield includes a second opposing surface along the first direction. The third shield includes a third opposing surface along the first direction. The second shield and the third shield are disposed such that the second opposing surface and the third opposing surface oppose each other, with the magnetic sensor and the current path sandwiched therebetween.

Abstract: A current detection device includes a plurality of current detection units arranged in the current detection device. Each of the current detection units includes a bus bar that enables a current to be measured to flow therethrough, a magnetic sensor disposed at a position facing the bus bar, and a pair of shields disposed so as to sandwich the bus bar and the magnetic sensor in a facing direction in which the bus bar and the magnetic sensor face each other. The bus bars of the plurality of current detection units extend so as to be aligned to one another and, as viewed in the facing direction, the positions of the shield and the magnetic sensor of each of the current detection units in an extension direction of the bus bars differ from the positions of the shield and the magnetic sensor of the adjacent current detection unit.

Abstract: A current sensor according to the present invention includes a bus bar through which a measuring current flows; a nut with which the bus bar and an external terminal are brought into contact with and fastened to each other; a magnetic sensor capable of detecting a magnetic field generated when a current flows through the bus bar; a case member having a housing area in which the magnetic sensor is allowed to be housed, the case member sealing the bus bar and the nut inside; and a cover member provided over the housing area. The case member has an open part in which a portion of the nut is exposed. The open part is covered by an insulative protective member. Therefore, shavings generated when a bolt for fastening an external terminal is screwed into the nut are prevented from dropping to the outside of the current sensor.