| 摘要 |
PURPOSE:To reduce defectives and to improve frequency characteristics by specifying jointless cores and then by providng both leg parts of them with detection coils wound previsouly in separate bodies so that they will penetrate working gaps from free ends of respective leg parts. CONSTITUTION:Leg parts 21A and 21B of jointless core 20 at both the sides are narrowed to left from the side of short-circuit base 22 to form a nearly delta shape, free ends 21a and 21b of respective parts have inside flat sufaces to form working gaps opposing to each other, and interval W is set to prescribed size. Then, both leg parts 21A and 21B of this core 20 are provided with detection coils 24A and 24B wound in separate bodies from sides of free ends 21a and 21b through working gap 23 so that they will be positioned at symmetric places of leg parts 21A and 21B. Thus, defectives can be reduced, frequency charactersitics in record reproduction can be improved and an output loss can also be lessened. |
