# US 2017/0287622 A1 · Thin film inductor

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- Number: US 2017/0287622 A1
- Document ID: US20170287622A1
- Status: Published application
- Kind: A1
- Application number: 15/467,278
- Filed: 2017-03-23
- Published: 2017-10-05
- Earliest claimed: 2016-03-30
- Assignees: TDK Corporation
- Applicants: TDK Corporation
- Inventors: Kazuo ISHIZAKI
- Web page: https://patentgrep.com/patent/US20170287622A1

## CPC

- H01F 27/2804: {Printed windings}
- H01F 17/0013: {with stacked layers}
- H01F 27/323: {Insulation between winding turns, between winding layers}
- H01F 41/042: {by thin film techniques}
- H01F 41/046: {structurally combined with ferromagnetic material}
- H01F 27/2809: {on stacked layers}
- H01F 2017/048: {with encapsulating core, e.g. made of resin and magnetic powder}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A thin film inductor 1 includes: a coil part that is formed of at least one coil conductor layer and has terminal electrodes provided at both ends thereof; a first insulating layer that covers the coil part; and a second insulating layer that covers the first insulating layer and has a higher Young's modulus than the first insulating layer.

## Claims

### Claim 1

A thin film inductor comprising:
a coil part formed of at least one coil conductor layer and having terminal electrodes provided at both ends thereof;
a first insulating layer configured to cover the coil part; and
a second insulating layer configured to cover the first insulating layer and having a higher Young's modulus than the first insulating layer.

### Claim 2 (depends on 1)

The thin film inductor according to claim 1, wherein the second insulating layer uses a composite material of a ceramic or a resin and a metal material as a main component.

### Claim 3 (depends on 2)

The thin film inductor according to claim 2, wherein the metal material is nickel, iron, aluminum, or copper.