Electronic component and method for producing electronic component

Patent metadata

Field	Value
Publication number	US-12224097-B2
Application number	US-202318315734-A
Country	US
Kind code	B2
Filing date	May 11, 2023
Priority date	Nov 8, 2018
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

An electronic component that has fewer cracks during production is provided. The electronic component includes an outer electrode on a multilayer body, which includes an inner glass layer, a magnetic material layer on top and bottom surfaces of the inner glass layer, and an outer glass layer on top and bottom surfaces of the magnetic material layer. The insulating layers of the inner glass layer and the outer glass layers contain a dielectric glass material that contains a glass material containing at least K, B, and Si, quartz, and alumina. The glass material content of each insulating layer of the inner glass layer ranges from approximately 60%-65% by weight, the quartz content of each insulating layer of the inner glass layer ranges from approximately 34%-37% by weight, and the alumina content of each insulating layer of the inner glass layer ranges from approximately 0.5%-4% by weight.

First claim

What is claimed is:

1. An electronic component comprising an outer electrode on a surface of a multilayer body, the multilayer body including an inner glass layer, a magnetic material layer on a top surface and a bottom surface of the inner glass layer, and an outer glass layer on a top surface and a bottom surface of the magnetic material layer,
wherein the inner glass layer includes a coil multilayer body and a lead-out electrode layer on a top surface and/or a bottom surface of the coil multilayer body, the coil multilayer body including a plurality of coil conductor layers, each of the coil conductor layers including a coil conductor having a coil pattern on a surface of an insulating layer, the lead-out electrode layer including a lead-out electrode on a surface of an insulating layer,
the coil multilayer body includes a primary coil conductor layer including a primary coil conductor and a secondary coil conductor layer including a secondary coil conductor stacked in this order on the bottom surface thereof,
the outer electrode includes a first outer electrode, a second outer electrode, a third outer electrode, and a fourth outer electrode,
the primary coil conductor is coupled to the first outer electrode and the third outer electrode,
the secondary coil conductor is coupled to the second outer electrode and the fourth outer electrode,
the insulating layers of the inner glass layer and the outer glass layers contain a dielectric glass material that contains a glass material containing at least K, B, and Si, quartz, and alumina,
the glass material content of each insulating layer of the inner glass layer ranges from approximately 60% to 65% by weight,
the quartz content of each insulating layer of the inner glass layer ranges from approximately 34% to 37% by weight, and
the alumina content of each insulating layer of the inner glass layer ranges from approximately 0.5% to 4% by weight.

2. A method for producing the electronic component according to claim 1 , comprising:
preparing a ceramic green sheet A for an inner glass layer;
preparing a ceramic green sheet B for a magnetic material layer;
preparing a ceramic green sheet C for an outer glass layer;
forming a coil conductor pattern on the ceramic green sheet A to form a coil sheet;
forming a lead-out electrode pattern on the ceramic green sheet A to form a lead-out electrode sheet;
stacking the ceramic green sheet C, the ceramic green sheet B, the lead-out electrode sheet, the coil sheet, the lead-out electrode sheet, the ceramic green sheet B, and the ceramic green sheet C in this order to form a multilayer body;
firing the multilayer body; and
forming an outer electrode on the fired multilayer body,
wherein the ceramic green sheet A contains quartz and alumina as filler components, the quartz constituting approximately 34% to 37% by weight of the ceramic green sheet A, the alumina constituting approximately 0.5% to 4% by weight of the ceramic green sheet A.

3. The electronic component according to claim 1 , wherein the quartz content of each outer glass layer is lower than the quartz content of each insulating layer of the inner glass layer.

4. The electronic component according to claim 3 , wherein a difference between the quartz content of each outer glass layer and the quartz content of each insulating layer of the inner glass layer ranges from approximately 3% to 6% by weight.

5. The electronic component according to claim 1 , wherein the alumina content of each insulating layer of the inner glass layer ranges from approximately 0.6% to 1% by weight.

6. The electronic component according to claim 1 , wherein each of the outer glass layers has a thickness in the range of approximately 15 to 45 μm.

Assignees

• Murata Manufacturing Co

Inventors

• Matsuura Kouhei
• Hamano Morihiro
• Tsuduki Keiichi

Classifications

• C03C3/04

  containing silica · CPC title

• C04B2237/341

  Silica or silicates · CPC title

• H01F2017/0093

  Common mode choke coil · CPC title

• H01F2017/002

  Details of via holes for interconnecting the layers · CPC title

• H01F2017/0066

  with a magnetic layer · CPC title