| 摘要 |
A current sensor (100) includes: a core (20) having a groove (21) where a conductor (10) through which a current flows is inserted, with a direction of plate width aligned with a direction of depth of the groove; and a detector element (30) arranged more closely to an opening (26) of the groove than the conductor, with a direction of detection laid along a direction of a space of the groove, and detecting strength of a magnetic field. The core has a U-shaped portion (50) whose surface facing the conductor is parallel to a surface defining the plate width, and narrow-width portions (60) whose groove width and core width along the direction of the space gradually expands and gradually narrows, respectively, from both ends on the side of the opening of the U-shaped portion toward the side of the opening. Boundary portions (55) between the U-shaped portion and the narrow-width portions are provided at a position facing the conductor. |
