A transformer is provided having good workability during production and good connection of the secondary main coil and the primary supportive coil. The transformer has a bobbin with a base part and first hollow cylinder part with a first through hole and a core projecting in a first positive direction from said base part, and a case having an upper collar part formed with a primary main coil wound around said first hollow cylinder part, a second through hole leading to said first through hole, and a second hollow cylinder part formed at the outer peripheral face. Said primary main coil is housed and projects in a first negative direction from said upper collar part. A lower collar part opposes said base part by extending approximately parallel to said mounting face. The primary supportive coil and secondary main coil are wound around said first and second sections, respectively.
1. A transformer comprising;
a bobbin comprising a base part extending approximately parallel to a mounting face, and a first hollow cylinder part formed at inside with a first through hole inserted by a core projecting out towards a first positive direction approximately perpendicular against said mounting face from said base part,
a primary main coil wound around said first hollow cylinder part,
a case comprising an upper collar part, a second hollow cylinder part and a lower collar part, said upper collar part formed with a second through hole connecting to said first through hole and extending approximately parallel to said mounting face, said second hollow cylinder part housing said primary main coil inside by projecting out towards a first negative direction which is an opposite direction of said first positive direction from said upper collar part and formed at an outer peripheral face with a first and second section divided by an intermediate collar part projecting out approximately parallel to said mounting face, and said lower collar part connected to an end part opposite to said upper collar part in said second hollow cylinder part and opposing said base part by extending approximately parallel to said mounting face,
a primary supportive coil wound around said first section, and
a secondary main coil wound around said second section, wherein
at a first end part, which is an one end part of said base part and an end part of a second positive direction approximately parallel to said mounting face, 4 or more of primary terminals, connected with both end parts of said primary main coil and said primary supportive coil, are provided,
at a second end part, which is the other end part of said base part, plurality of secondary terminals, connected with both end parts of said secondary main coil, are provided, and
said secondary main coil is separated by an intermediate collar part and said second hollow cylinder part from any one of primary coil connected to said primary terminals.
2. The transformer as set forth in claim 1 , wherein
said first end part is spaced apart from said second end part in regards with said second direction, further than a lower collar part end part which is an end part of said second positive direction at said lower collar part.
3. The transformer as set forth in claim 1 , wherein said primary supportive coil is provided so that it is closer to said lower collar part than said secondary main coil.