| 摘要 |
<p>A head base for securing a magnetic head element which can be used with either of two different types of drums having a regular diameter and a smaller diameter. The head base comprises a single base plate (11) having a transverse hole (13) perforated therein in such a manner as to define a front portion (14), a rear portion (15) and a pair of connecting portions (16) which connect the front (14) and rear portions (15) to each other such that the front portion (14) and the rear portion (15) are capable of being separated from each other at the connecting portions (16). When the head base is to be used with a drum of a regular diameter of a rotary drum apparatus, it is used as it is. But when it is to be used with a drum of a smaller diameter, it is cut or broken at the connecting portions (16) thereof to separate the front portion (14) from the rear portion (15), and only the front portion (14) is used as a head base. <IMAGE></p> |
