Inductor, transformer, and manufacturing method thereof

• US 5,939,966 A
• Filed: 03/16/1995
• Issued: 08/17/1999
• Est. Priority Date: 06/02/1994
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Shin' Ei, Ryu
• Primary Examiner(s): Gellner, Michael L.
• Assistant Examiner(s): MAI, ANH T
• Application Number:
  US08/405,176
• Time in Patent Office: 1,615 Days
• Field of Search: 336/223, 336/200, 336/225, 336/232, 336/83, 336/82
• US Class Current: 336/223
• CPC Class Codes: H01F 2027/2861 Coil formed by folding a blank
• CPC Class Codes: H01F 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/2847 Sheets; Strips H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/324 Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
• CPC Class Codes: H01F 41/041 Printed circuit coils apparatus or processes for manufacturing printed circuits in general H05K3/00
• CPC Class Codes: H01F 41/046 structurally combined with ferromagnetic material
• CPC Class Codes: H01F 41/061 Winding flat conductive wires or sheets

Abstract

An electric coil is formed from a plurality of strip parts including alternate strip parts and remaining strip parts. The alternate strip parts comprise alternate strip parts among the plurality of strip parts formed from a sheet of electrical conductor material, the plurality of strip parts forming a continuous electrical conductor having a form of a series of alternating reverse directional bends, a middle part of each strip part of the alternate strip parts being aligned with one another in a first line. The remaining strip parts comprise remaining strip parts among the plurality of strip parts, a middle part of each part of the remaining strip parts being aligned with one another in a second line separated from the first line. In manufacturing the electric coil, a forming member is used. The forming member has comb teeth, the comb teeth of the forming member being used to press and thus separate the middle part of each strip part of the alternate strip parts from the middle part of each strip part of the remaining strip parts.

Claims

1. An electric transformer including a primary winding and a secondary winding, said transformer comprising:

a pair of windings, a first winding forming a primary winding and a second winding forming a secondary winding of said transformer, each winding formed of a plurality of strip parts, said plurality of strip parts forming a continuous electrical conductor having a series of alternating reverse directional bends, said plurality of strip parts including alternate strip parts and remaining strip parts, each one of said alternate strip parts is respectively arranged adjacent to each one of said remaining strip parts, said plurality of strip parts having respective middle parts which have been bent so that each one of said middle parts of said alternate strip parts is coplanar with one another on a first plane and each one of said middle parts of said remaining strip parts is coplanar with one another on a second plane separated from said first plane by an open portions wherein at least some of said plurality of strip parts of said first winding overlap at least some of said plurality of strip parts of said second winding.

2. The electric coil according to claim 1, further comprising a magnetic core.

3. An inductor comprising:

an electric transformer including a pair of windings, a first winding forming a primary winding and a second winding forming a secondary winding of said transformer, each winding formed of a plurality of strip parts, said plurality of strip parts forming a continuous electrical conductor having a series of alternating reverse directional bends, said plurality of strip parts including alternate strip parts and remaining strip parts, each one of said alternate strip parts being respectively arranged adjacent to each one of said remaining strip parts, said plurality of strip parts having respective middle parts which have been bent so that each one of said middle parts of said alternate strip parts is coplanar with one another on a first plane and each one of said middle parts of said remaining strip parts is coplanar with one another on a second plane separated from said first plane by an open portion, wherein at least some of said plurality of strip parts of said first winding overlap at least some of said plurality of strip parts of said second winding.

4. The inductor according to claim 3, further comprising a magnetic core.

5. A transformer comprising:

a pair of windings, a first winding forming a primary winding and a second winding forming a secondary winding of said transformer, each winding formed of a plurality of strip parts, said plurality of strip parts forming a continuous electrical conductor having a series of alternating reverse directional bends, said plurality of strip parts including alternate strip parts and remaining strip parts, each one of said alternate strip parts being respectively arranged adjacent to each one of said remaining strip parts, said plurality of strip parts having respective middle parts which have been bent so that each one of said middle parts of said alternate strip parts is coplanar with one another on a first plane and each one of said middle parts of said remaining strip parts is coplanar with one another on a second plane separated from said first plane by an open portion, wherein at least some of said plurality of strip parts of said first winding overlap at least some of said plurality of strip parts of said second winding.

6. The transformer according to claim 5, further comprising a magnetic core.

7. An electric coil manufacturing method comprising the steps of:

processing a single bendable sheet of electrical conductor material to form a continuous electrical conductor having a series of alternating reverse directional bends, said continuous electrical conductor having a plurality of strip parts, said plurality of strip parts including alternate strip parts and remaining strip parts, each one of said alternate strip parts being respectively arranged adjacent to each one of said remaining strip parts, said plurality of strip parts having respective middle parts;

placing the processed single bendable sheet of electrical conductor material between first and second forming members;

pressing the first and second forming members together for bending said middle parts of said alternate strip parts so as to cause said middle parts of said alternate strip parts to separate from said middle parts of said remaining strip parts to form an open portion between said alternate strip parts and said remaining strip parts; and

incorporating a magnetic core in said open portion between said alternate strip parts and said remaining strip parts.

8. The electric coil manufacturing method according to claim 7, wherein said bending step moves said middle parts of said plurality of strip parts by using a forming member having comb teeth, said comb teeth of said forming member being used to respectively press and bend and thus separate said middle parts of said alternate strip parts from said middle parts of said remaining strip parts.

9. The electric coil manufacturing method according to claim 8, further comprising the step of removing said forming member from said plurality of strip parts after said bending step has been performed.

10. An inductor manufacturing method comprising the steps of:

processing a single bendable sheet of electrical conductor material to form a continuous electrical conductor having a series of alternating reverse directional bends, said continuous electrical conductor including a plurality of strip parts, said plurality of strip parts including alternate strip parts and remaining strip parts, each one of said alternate strip parts being respectively arranged adjacent to each one of said remaining strip parts, said plurality of strip parts having respective middle parts;

placing the processed single bendable sheet of electrical conductor material between first and second forming members;

pressing the first and second forming members together for bending said middle parts of said alternate strip parts so as to cause said middle parts of said alternate strip parts to separate from said middle parts of said remaining strip parts to form an open portion between said alternate strip parts and said remaining strip parts; and

incorporating a magnetic core in said open portion.

11. A transformer manufacturing method comprising the steps of:

laying a plurality of bendable sheets of electrical conductor material adjacent to one another so as to form layers of electrical conductor;

processing said layers of electrical conductor to form a plurality of continuous electrical conductors, each of said continuous electrical conductors having a series of alternating reverse directional bends, each of said continuous electrical conductors including a plurality of strip parts, said plurality of strip parts including alternate strip parts and remaining strip parts, each one of said alternate strip parts being respectively arranged adjacent to each one of said remaining strip parts, said plurality of strip parts having respective middle parts;

placing the processed single bendable sheet of electrical conductor material between first and second forming members;

pressing the first and second forming members together for bending said middle parts of said alternate strip parts so as to cause said middle parts of said alternate strip parts to separate from said middle parts of said remaining strip parts to form an open portion therebetween; and

incorporating a magnetic core in said open portion.