Thin magnetic element and transformer

• US 6,351,204 B1
• Filed: 05/02/2000
• Issued: 02/26/2002
• Est. Priority Date: 08/08/1996
• Status: Expired due to Fees

• Current Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Yamasawa, Kiyohito, Hasegawa, Naoya, Naito, Yutaka, Hatanai, Takashi, Hayakawa, Yasuo, Makino, Akihiro
• Primary Examiner(s): MAI, ANH T
• Application Number:
  US09/565,285
• Time in Patent Office: 665 Days
• Field of Search: 336/200, 336/223, 336/232, 336/83, 148/304, 148/306, 428/692, 428/900, 428/611, 428/328, 428/332
• US Class Current: 336/200
• CPC Class Codes: H01F 10/187 Amorphous compounds H01F10/3204 takes precedence
• CPC Class Codes: H01F 17/0006 Printed inductances printed coils for dynamo-electric machines H02K3/26; printed circuits H05K
• CPC Class Codes: H01F 2017/0066 with a magnetic layer

Abstract

A thin magnetic element comprising a coil pattern formed on at least one side of a substrate and a thin magnetic film formed on the coil pattern, wherein, assuming that the thickness and width of a coil conductor constituting the coil pattern are t and a, respectively, an aspect ratio t/a of the coil conductor satisfies the relationship 0.035≦t/a≦0.35, and the thin magnetic film has a resistivity of 400 μΩcm or more.

Claims

1. A thin film magnetic element comprising a coil pattern formed on at least one side of a substrate, and a thin magnetic film formed on the coil pattern, wherein:

assuming that the thickness and width of a coil conductor constituting the coil pattern are “

t” and

“

a”

, respectively, the aspect ratio t/a of the coil conductor satisfies the relationship 0.035≦

t/a≦

0.35, and

the thin magnetic film has a resistivity of 400 μ

Ω

cm or more.

2. A thin film magnetic element according to claim 1, wherein assuming that the width of the coil conductor constituting the coil pattern is “

a”

, and the distance between the coil conductors adjacent each other in the coil pattern is “

b”

, the relationship of 0.2≦

a/(a+b) is satisfied.

3. A transformer comprising coil patterns formed on both sides of a substrate, and thin magnetic films formed on the coil patterns, wherein:

assuming that the thickness and width of a coil conductor constituting the coil patterns are “

t” and

“

a”

, respectively, the aspect ratio t/a of the coil conductor satisfies the relationship 0.035≦

t/a≦

0.35, and

the thin magnetic films have a resistivity of 400 μ

Ω

cm or more.

4. A transformed according to claim 3, wherein assuming that the width of the coil conductor constituting the coil patterns is “

a”

, and the distance between the coil conductors adjacent each other in the coil pattern is “

b”

, the relationship of 0.2≦

a/(a+b) is satisfied.