# US 12,217,905 B2 · Electronic component

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- Number: US 12,217,905 B2
- Document ID: US12217905B2
- Status: Granted
- Kind: B2
- Application number: 17/977,038
- Filed: 2022-10-31
- Published: 2023-05-25
- Granted: 2025-02-04
- Earliest claimed: 2021-11-22
- Assignees: TDK Corporation
- Applicants: TDK Corporation
- Inventors: Hidenobu Umeda; Masaki Takahashi; Kaori Sasaki; Nami Enomoto
- Web page: https://patentgrep.com/patent/US12217905B2

## CPC

- H01F 17/0013: {with stacked layers}
- H01F 27/324: {Insulation between coil and core, between different winding sections, around the coil; Other insulation structures}
- C03C 3/066: containing zinc
- C03C 3/089: containing boron
- C03C 3/091: containing aluminium
- C03C 10/0036: {containing SiO2, Al2O3 and a divalent metal oxide as main constituents}
- C03C 12/00: Powdered glass (C03C8/02 takes precedence); Bead compositions
- H01F 27/2804: {Printed windings}
- H01F 41/043: {by thick film techniques}
- H01F 41/125: {Other insulating structures; Insulating between coil and core, between different winding sections, around the coil}
- H01F 27/2809: {on stacked layers}
- H01F 2017/0073: {with a special conductive pattern, e.g. flat spiral}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

An electronic component includes a glass ceramic layer and a conductor layer. The glass ceramic layer includes feldspar crystal phases, non-crystalline glass phases, and Al2O3 phases. The area ratio of the feldspar crystal phases in the vicinity of the conductor layer is larger than the area ratio of the feldspar crystal phases away from the conductor layer.

## Claims

### Claim 1

An electronic component comprising:
a glass ceramic layer; and
a conductor layer, wherein
the glass ceramic layer includes feldspar crystal phases, non-crystalline glass phases, and Al2O3 fillers of Al2O3 phases; and
an area ratio of the feldspar crystal phases in a vicinity of the conductor layer is larger than an area ratio of the feldspar crystal phases away from the conductor layer.

### Claim 2 (depends on 1)

The electronic component according to claim 1, wherein
the conductor layer mainly comprises Ag.

### Claim 3 (depends on 1)

The electronic component according to claim 1, wherein
the Al2O3 fillers of the Al2O3 phases have an average aspect ratio of 15 or more and 75 or less.

### Claim 4 (depends on 1)

The electronic component according to claim 1, wherein
the feldspar crystal phases mainly comprise Sr.

### Claim 5 (depends on 1)

The electronic component according to claim 1, wherein
the feldspar crystal phases comprise Ag.

### Claim 6 (depends on 1)

The electronic component according to claim 1, wherein
the glass ceramic layer optionally includes SiO2 phases and
the phases other than the feldspar crystal phases, the non-crystalline glass phases, the Al2O3 phases, and the SiO2 phases occupy an area ratio of 5% or less, including 0%.

### Claim 7 (depends on 1)

The electronic component according to claim 1, wherein
at least one pair of the Al2O3 phases is bonded via at least one of the feldspar crystal phases.