| 摘要 |
In a head portion 13 disposed at a side 1, rails 13a and are formed projectingly and a head gap G16 is formed in the rail 13a located on an inner side. Likewise, in a head portion 15 disposed at a side 0, rails 15a and 15b are formed projectingly in an opposed relation to the rails 13b and 13a, respectively, and a head gap G17 is formed in the rail 15a located on an outer side. A point 16a of abutment of the head gap G16 with a magnetic disc D and a point 17a of abutment of the head gap G17 with the magnetic disc are projected in an alternate manner beyond a center S in the thickness direction the magnetic disc, whereby the head gaps G16, G17 and the magnetic disc D can be kept in satisfactory contact with each other.
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