IP Library › Granted Patent US 12700547
Granted Patent B2
US 12700547 · App. 18/708,479 · Granted Aug 4, 2026

Thin-film capacitor with protective insulating films embedding capacitor electrodes

Inventor: Hitoshi Saita (Tokyo, JP)
Assignee: TDK Corporation
H01G4/33H01G4/224H01G4/228
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Quick Facts
Patent No.
US 12700547
App. No.
18/708,479
Granted
Aug 4, 2026
Kind
B2
Abstract

A thin film capacitor 1 includes a dielectric layer, capacitor electrodes formed respectively on first and second surfaces of the dielectric layer, a protective insulating film formed on the first surface of the dielectric layer so as to embed therein one of the capacitor electrodes, a protective insulating film formed on the second surface of the dielectric layer so as to embed therein the other of the capacitor electrodes, and terminal electrodes connected respectively to the capacitor electrodes. One of the terminal electrodes includes a first section positioned on the upper surface of the protective insulating film and partly overlapping the other of the capacitor electrode and a second section positioned on the side surface of the protective insulating film so as to contact the one of the capacitor electrodes. The other of the terminal electrodes is not formed on the upper surface of the protective insulating film.

Claims (56)

1 . A thin film capacitor comprising:

a dielectric layer having a first surface and a second surface positioned on an opposite side of the first surface;

a first capacitor electrode formed on the first surface of the dielectric layer;

a second capacitor electrode formed on the second surface of the dielectric layer;

a first protective insulating film formed on the first surface of the dielectric layer so as to embed therein the first capacitor electrode;

a second protective insulating film formed on the second surface of the dielectric layer so as to embed therein the second capacitor electrode;

a first terminal electrode electrically connected to the first capacitor electrode; and

a second terminal electrode electrically connected to the second capacitor electrode,

wherein each of the first protective insulating film and the second protective insulating film is made of a material different from a material of the dielectric layer,

wherein the first terminal electrode has a first section positioned on an upper surface of the first protective insulating film and partly overlapping the second capacitor electrode and a second section positioned on a side surface of the first protective insulating film so as to contact the first capacitor electrode, and

wherein the second terminal electrode is not formed on the upper surface of the first protective insulating film.

2 . The thin film capacitor as claimed in claim 1 ,

wherein the second terminal electrode has a third section positioned on an upper surface of the second protective insulating film and partly overlapping the first capacitor electrode and a fourth section positioned on a side surface of the second protective insulating film so as to contact the second capacitor electrode, and

wherein the first terminal electrode is not formed on the upper surface of the second protective insulating film.

3 . The thin film capacitor as claimed in claim 1 , wherein each of the first protective insulating film and the second protective insulating film is made of resin.

4 . The thin film capacitor as claimed in claim 1 , wherein the first protective insulating film contacts both the first surface of the dielectric layer and the first capacitor electrode.

5 . The thin film capacitor as claimed in claim 4 , wherein the second protective insulating film contacts both the second surface of the dielectric layer and the second capacitor electrode.

6 . The thin film capacitor as claimed in claim 1 , wherein the first protective insulating film is thicker than the dielectric layer.

7 . The thin film capacitor as claimed in claim 6 , wherein the second protective insulating film is thicker than the dielectric layer.

8 . The thin film capacitor as claimed in claim 1 , wherein of the first capacitor electrode and the second capacitor electrode, the first capacitor electrode is an only capacitor electrode contacting the first terminal electrode.

9 . The thin film capacitor as claimed in claim 8 , wherein of the first capacitor electrode and the second capacitor electrode, the second capacitor electrode is an only capacitor electrode contacting the second terminal electrode.

10 . A thin film capacitor including first and second unit capacitors,

wherein each of the first and second unit capacitors comprises:

a dielectric layer having a first surface and a second surface positioned on an opposite side of the first surface;

a first capacitor electrode formed on the first surface of the dielectric layer;

a second capacitor electrode formed on the second surface of the dielectric layer;

a first protective insulating film formed on the first surface of the dielectric layer so as to embed therein the first capacitor electrode;

a second protective insulating film formed on the second surface of the dielectric layer so as to embed therein the second capacitor electrode;

a first terminal electrode electrically connected to the first capacitor electrode; and

a second terminal electrode electrically connected to the second capacitor electrode,

wherein the first terminal electrode has a first section positioned on an upper surface of the first protective insulating film and partly overlapping the second capacitor electrode and a second section positioned on a side surface of the first protective insulating film so as to contact the first capacitor electrode,

wherein the second terminal electrode is not formed on the upper surface of the first protective insulating film, and

wherein the first and second unit capacitors are stacked such that (1) the first section of the first terminal electrode included in the first unit capacitor and the first section of the first terminal electrode included in the second unit capacitor are connected to each other; and (2) a surface of the first protective insulating film opposite the dielectric layer in the first unit capacitor and a surface of the first protective insulating film opposite the dielectric layer in the second unit capacitor face each other.

11 . The thin film capacitor as claimed in claim 10 , further including a third unit capacitor having a same configuration as those of the first and second unit capacitors,

wherein the second terminal electrode has a third section positioned on an upper surface of the second protective insulating film and partly overlapping the first capacitor electrode and a fourth section positioned on a side surface of the second protective insulating film so as to contact the second capacitor electrode,

wherein the first terminal electrode is not formed on the upper surface of the second protective insulating film, and

wherein the first, second, and third unit capacitors are stacked such that the third section of the second terminal electrode included in the second unit capacitor and the third section of the second terminal electrode included in the third unit capacitor are connected to each other.

12 . The thin film capacitor as claimed in claim 11 , further comprising a solder provided between the second terminal electrode included in the second unit capacitor and the second terminal electrode included in the third unit capacitor.

13 . The thin film capacitor as claimed in claim 11 , wherein the second and third unit capacitors are stacked such that the second protective insulating film in the second unit capacitor and the second protective insulating film in the third unit capacitor face each other.

14 . The thin film capacitor as claimed in claim 10 , further comprising a solder provided between the first terminal electrode included in the first unit capacitor and the first terminal electrode included in the second unit capacitor.

15 . The thin film capacitor as claimed in claim 10 , wherein each of the first and second protective insulating films is made of resin.

16 . The thin film capacitor as claimed in claim 10 ,

wherein the first protective insulating film contacts both the first surface of the dielectric layer and the first capacitor electrode, and

wherein the second protective insulating film contacts both the second surface of the dielectric layer and the second capacitor electrode.

17 . A thin film capacitor comprising:

a dielectric layer having a first surface and a second surface positioned on an opposite side of the first surface;

a first capacitor electrode contacting the first surface of the dielectric layer;

a second capacitor electrode contacting the second surface of the dielectric layer;

a first protective insulating film contacting both the first surface of the dielectric layer and the first capacitor electrode and having an upper surface and a side surface;

a second protective insulating film contacting both the second surface of the dielectric layer and the second capacitor electrode and having an upper surface and a side surface;

a first terminal electrode having a first section contacting the upper surface of the first protective insulating film and a second section contacting the side surface of the first protective insulating film so as to contact the first capacitor electrode; and

a second terminal electrode having a third section contacting the upper surface of the second protective insulating film and a fourth section contacting the side surface of the second protective insulating film so as to contact the second capacitor electrode,

wherein the upper surface of the first protective insulating film is free from the second terminal electrode, and

wherein the upper surface of the second protective insulating film is free from the first terminal electrode.

18 . The thin film capacitor as claimed in claim 17 , wherein each of the first protective insulating film and the second protective insulating film is made of resin.

19 . The thin film capacitor as claimed in claim 17 , wherein each of the first protective insulating film and the second protective insulating film is thicker than the dielectric layer.