| 摘要 |
PURPOSE:To improve a joint state and to improve magnetic characteristics by cutting both end parts of the opening of the recessed part of a joint part nearly in an L shape respectively and thus forming grooves for adhesion at joint parts of a front and a rear part core. CONSTITUTION:The front core 11 is constituted by jointing front core half bodies 11a and 11b made of sendust while clamping a thin plate of a nonmagnetic gap forming material and has a semicylindrical shape on the whole; and a working gap 12 is made shorter than the thickness (t) of the front core 11 through a track working groove 13 to meet prescribed track width. At the rear surface part of this front core 11, i.e. the joint part of the rear core 17, a rectangular recessed part 15 having width (a) and depth (b) is formed from the width-directional intermediate part of the rear end surface and both opening ends of this recessed part 15 are cut nearly in an L shape by (c) in the width direction and by (d) in the front-rear direction to form grooves 16a and 16b for adhesion. |
