Transformer

• US 20040108929A1
• Filed: 12/05/2003
• Published: 06/10/2004
• Est. Priority Date: 12/06/2002
• Status: Abandoned Application

• Current Assignee: Koito Manufacturing Company Limited
• Original Assignee: Koito Manufacturing Company Limited
• Inventors: Toyama, Takuya, Ichikawa, Tomoyuki, Suzuki, Tetsuya, Ohta, Shinji
• Application Number:
  US10/727,567
• Publication Number:
  US 20040108929A1
• Time in Patent Office: Days
• US Class Current: 336/83
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/2847 Sheets; Strips H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/306 Fastening or mounting coils or windings on core, casing or other support
• CPC Class Codes: H01F 38/10 Ballasts, e.g. for discharge lamps

Abstract

A transformer comprises a coil portion having a plurality of windings, and a plurality of cores arranged to sandwich the coil portion from aligning directions of the windings, and the windings includes ring-like portions formed by winding a flat-type wire like a ring to overlap each other; both end portions of the flat-type wire are led from the ring-like portions respectively; the plurality of windings and the plurality of cores are arranged along the overlapped direction of the flat-type wire; a projected portion is formed on a first core; the ring-like portions are positioned such that the ring-like portions are fitted on an outer side of the projected portion; a flat surface portion of a second core is positioned to oppose to the projected portion; a gap is formed between the flat surface portion and a top end portion of the projected portion, and the windings are positioned at positions except a position that surrounds the gap.

Claims

1. A transformer, comprising a coil portion having a plurality of windings, and a plurality of cores arranged to sandwich the coil portion from aligning directions of the windings,

wherein the windings includes ring-like portions formed by winding a flat-type wire like a ring to overlap each other;

both end portions of the flat-type wire are led from the ring-like portions respectively;

the plurality of windings and the plurality of cores are arranged along the overlapped direction of the flat-type wire;

a projected portion is formed on a first core;

the ring-like portions are positioned such that the ring-like portions are fitted on an outer side of the projected portion;

a flat surface portion of a second core is positioned to oppose to the projected portion;

a gap is formed between the flat surface portion and a top end portion of the projected portion, and

the windings are positioned at positions except a position that surrounds the gap.

2. A transformer according to claim 1, wherein inclined surfaces are formed on the top end portion of the projected portion so that a sectional area of the projected portion is set at the top end portion to be reduced gradually toward a top end surface.

3. A transformer according to claim 1,

wherein the end portions form leading terminals of the windings, and

a width between leading terminals of primary windings and a width between leading terminals of secondary windings are differentiated.

4. A transformer according to claim 1,

wherein two outer leg portions, for covering a part of the coil portion from an outer periphery side, positioned mutually on opposite sides to put the coil portion therebetween, are provided to the first core, and

mutually-opposing surfaces of the two outer leg portions are formed straightly in parallel.