| 摘要 |
<p>PURPOSE: To obtain an air core film-type transformer which is less affected by an edge effect by a method wherein the film-type transformer is equipped with a primary winding pattern and a secondary winding pattern provided adjacent to each other onto a thin film board, and the windings are made to grow larger in width or thickness with a distance from their center. CONSTITUTION: A right half of a circular board 1 is shown in Figure, wherein a left end indicates the center of the board 1, and a right end shows the right end of the board 1. Winding patterns 2 and 3 are formed on the upside of the board 1, and windings patterns 2' and 3' are formed on the underside by etching or the like. A gap g provided between the windings is set constant, and the widths w1 , w2 ,... of the windings are set so as to grow larger with a distance from their center to satisfy a formula, w1 <w2 <...<wn . By this setup, a film- type transformer of this constitution is less affected by an edge effect caused by a concentration of a magnetic field, prevented from increasing in inner inductance, and improved in degree of coupling between a primary and a second coil.</p> |
