| 摘要 |
PURPOSE:To extend the life of a magnetic head and record information with a high density by providing each of two magnetic head projecting parts with the first curved surface including an electromagnetic gap and the second curved surface which is provided on both sides of the first curved surface and has a radius of curvature smaller than that of the first curved surface. CONSTITUTION:The first curved surface 21 having a curvature radius R1 is formed on the projecting part having an electromagnetic conversion gap 20 for recording, and the second curved surface 22 having a curvature radius R2 smaller than R1 is formed on both sides of the first curved surface 21. They are so constituted that an angle beta formed between the tangent of the second curved surface 22 at inflection points C and D and a chord (g) of the first curved surface 21 is larger than an angle alphaformed between the tangent of the first curved surface 21 at inflection points C and D and the chord (g). Therefore, since a part of the air current along the head surface 22 due to the motion of a magnetic tape 10 in the direction of an arrow 23 is eliminated at the inflection point C, the thickness of the air film between a magnetic head 11 and the magnetic tape 10 is minute. The same effect is shown at inflection points E and F with respect to the other projecting part having an electromagentic conversion gap 20' for reproducing. Thus, the life of the magnetic head is extended, and high-density recording is possible. |
