Miniature transformer having compressed laminations

DETAILED DESCRIPTION This invention is suggested in view of the above mentioned fact and has it as an object to provide a miniature transformer provided with an insulating cover having a function of pressing laminated cores in the laminating direction to laminate the respective core sheets as intimately bonded.
In this invention, core sheets laminated and incorporated from the front and rear in the axial direction into a coil bobbin 1 in which a coil 5 is wound on a barrel part 2, then first and second insulating cover halves 9,9 are opposed to the respective laminated cores 8 and are connected in the tip portions to apply an insulating cover 9 around the cores 8, these respective first and second insulating cover halves 9,9 are respectively substantially U-shaped as a whole and have on the insides groove-like core containing parts 10 for containing leg parts 8b and their connecting parts 8c on both sides of the cores 8 and the lower part of the tip portion of at least either one arm part 9A of each of the first and second insulating cover halves 9,9 is shaped as inclined with a slope made in advance so that the cores 8 may be pressed upward in case the tip portions are incorporated into the coil bobbin 1 to attain the above mentioned object.
That is to say, the exposed portions except central legs 8a of the laminated cores 8 incorporated in the coil bobbin 1 are covered with an insulating cover 90 made by connecting the first and second insulating cover halves 9,9 having the core containing parts for containing those portions.
In this case, connecting parts 13B having a resiliency to lift upward the lower parts of the cores 8 will be formed in the tip parts of the respective cover halves to thereby press upward the lower sides of the laminated cores 8 and prevent a gap from being produced between the laminations of the cores 8.