| 摘要 |
<p>An apparatus for recording and reproducing data to and from a disk-like magnetic recording medium which rotates about a drive axis thereof, wherein at least a pair of magnetic head members (19) and (20) are brought into contact with said medium from both sides at given pressure. Side walls of the magnetic members (19) and (20) are provided with light-transmitting means (25) and (26) to hold a light-transmitting floppy disk (18) from both sides. Light is transmitted through said means (25) and (26) to fall on a portion where the floppy disk (18) is in contact with the magnetic head chips (21) and (22) so that there appear interference fringes. Protrusion (δ) of the head and the head attitude are controlled while observing the interference fringes, so that the magnetic head gap may be in steady contact with the floppy disk to provide good recording and reproduction.</p> |
