JPS5730301A - Iron core for small transformer - Google Patents

Abstract

PURPOSE:To miniaturize a transformer holding performance of operation by a method wherein the inside faces of outside legs of cores are curved as to along the outside circumferential face of a coil, the side faces of an inside leg facing to the outside legs are formed protruding nearly in parallel with the inside faces of outside legs, and the inside leg is formed as thinner than the breadth of core. CONSTITUTION:The inside faces of right and left legs 15a, 16a of the cores 15, 16 are formed as to curve in a polygonal shape along the outer circumferential face of the coil, center legs 15b, 16b are made flatly and as thinner than the breadth of the core, and the side faces thereof facing with the right and left legs 15a, 16a are formed protruding in a square shape as to along the inside circumferential face of the coil. Moreover to make provision for the quipping position of terminal pins as the transformer, notches 15c, 16c are provided at both the side yoke parts of the center legs 15b, 16b being placed between the right and left legs 15a, 16a. Accordingly because the part of the coil protruding from the core can be made extremely small, miniaturization of the transformer is enabled without damaging performance characteristic as compared with the traditional small transformer.