US 11,756,721 B2
Planar transformer
Haruhiko Morita, Ogaki (JP); Hitoshi Miwa, Ogaki (JP); Shinobu Kato, Ogaki (JP); Toshihiko Yokomaku, Ibi-gun (JP); Hisashi Kato, Ogaki (JP); Takahisa Hirasawa, Ogaki (JP); Tetsuya Muraki, Ogaki (JP); and Takayuki Furuno, Ogaki (JP)
Assigned to IBIDEN CO., LTD., Ogaki (JP)
Filed by IBIDEN CO., LTD., Ogaki (JP)
Filed on Feb. 28, 2020, as Appl. No. 16/804,047.
Claims priority of application No. 2019-042659 (JP), filed on Mar. 8, 2019.
Prior Publication US 2020/0286678 A1, Sep. 10, 2020
Int. Cl. H01F 27/28 (2006.01); H01F 27/29 (2006.01); H01F 27/06 (2006.01)
CPC H01F 27/29 (2013.01) [H01F 27/06 (2013.01); H01F 27/2804 (2013.01); H01F 2027/065 (2013.01); H01F 2027/2809 (2013.01); H01F 2027/2819 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A planar transformer, comprising:
a coil substrate comprising a flexible substrate and a plurality of coils formed on the flexible substrate,
wherein the coil substrate is formed to have a plurality of coil parts and a plurality of coilless parts such that the coil parts have the coils and that the coilless parts do not have the coils, and the coil substrate is folded such that at least one of the coilless parts is sandwiched between two of the coil parts,
the plurality of coil parts and the plurality of coilless parts are formed between a first end of the flexible substrate and a second end of the flexible substrate on an opposite side with respect to the first end such that the coil parts and the coilless parts form a row, and the coilless part sandwiched between the two of the coil parts includes the first end of the flexible substrate.