| 摘要 |
PURPOSE:To improve reproduction efficiency and an S/N, by specifying the size and the shape of a balance winding thin film coil with a prescribed number of windings. CONSTITUTION:The cycle intervals (coil pitch ) Cp1 of coils 4a and 4b arranged in the inside of front magnetic cores 2a and 2b and a rear magnetic core 5 are formed so that they are formed smaller than the cycle intervals (coil pitch ) Cp2 of the coil 4a and 4b arranged at the outside of those magnetic cores 2a, 2b, and 5. In other words, since a space between the conductors of adjacent turns is set constant everywhere, the conductor width of the coils 4a and 4b in the inside of the magnetic cores 2a, 2b, and 5 are formed smaller than those of the coils 4a and 4b at the outside of the magnetic cores 2a, 2b, and 5 by a difference between the Cp1 and the Cp2. In such a way, it is possible to reduce magnetic resistance by reducing the magnetic path length of the magnetic core remarkably, and to heighten the reproduction efficiency and the S/N. |
