Patent ID: 7852188

Claim:
A transformer comprising: a bobbin unit having a first primary winding portion, and a first secondary winding portion; a first primary winding wound around said first primary winding portion of said bobbin unit; a first secondary winding wound around said first secondary winding portion of said bobbin unit, and coupled electromagnetically to said first primary winding; and a core unit mounted to said bobbin unit and including a first core part that includes a connecting segment extending in a longitudinal direction, a first insertion segment extending from said connecting segment of said first core part in a transverse direction perpendicular to the longitudinal direction and through said first primary winding portion of said bobbin unit, and a first extension segment extending from said connecting segment of said first core part in the transverse direction and spaced apart from said first insertion segment of said first core part, and a second core part that forms a magnetic circuit path with said first core part and that includes a connecting segment extending in the longitudinal direction, a first insertion segment extending from said connection segment of said second core part in the transverse direction toward said first core part and through said first secondary winding portion of said bobbin unit, and disposed in contact with said first insertion segment of said first core part, a first extension segment extending from said connection segment of said second core part in the transverse direction toward said first core part, spaced apart from said first insertion segment of said second core part, and disposed in contact with said first extension segment of said first core part, and a first adjusting segment extending from said connecting segment of said second core part in the transverse direction toward said first core part.