IP Library › Granted Patent US 12700546
Granted Patent B2
US 12700546 · App. 18/708,472 · Granted Aug 4, 2026

Thin film capacitor with terminal electrode having overlapping and non-overlapping sections

Inventor: Hitoshi Saita (Tokyo, JP)
Assignee: TDK Corporation
H01G4/33H01G4/228H01G4/38
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 12700546
App. No.
18/708,472
Granted
Aug 4, 2026
Kind
B2
Abstract

A thin film capacitor 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 another 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 protective insulating film so as to overlap the other of the capacitor electrodes, a second section positioned on the protective insulating film so as not to overlap the other of the capacitor electrodes, and a third section connecting the first and second sections.

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 the first terminal electrode includes a first section positioned on the first protective insulating film so as to overlap the first capacitor electrode, a second section positioned on the second protective insulating film so as not to overlap the second capacitor electrode, and a third section connecting the first and second sections, and

wherein the first section of the first terminal electrode is larger than the second section of the first terminal electrode.

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

wherein the first capacitor electrode is exposed from a first side surface of a stacked body including the dielectric layer, first and second capacitor electrodes, and first and second protective insulating films, and

wherein the third section is positioned on the first side surface.

3 . The thin film capacitor as claimed in claim 2 , wherein the second terminal electrode includes a fourth section positioned on the first protective insulating film so as not to overlap the first capacitor electrode, a fifth section positioned on the second protective insulating film so as to overlap the second capacitor electrode, and a sixth section connecting the fourth and fifth sections.

4 . The thin film capacitor as claimed in claim 3 ,

wherein the second capacitor electrode is exposed from a second side surface of the stacked body, and

wherein the sixth section is positioned on the second side surface.

5 . The thin film capacitor as claimed in claim 3 , wherein the fifth section of the second terminal electrode is larger than the fourth section of the second terminal electrode.

6 . The thin film capacitor as claimed in claim 5 , wherein the fifth section of the second terminal electrode partially overlaps the first capacitor electrode.

7 . The thin film capacitor as claimed in claim 1 , wherein the first section of the first terminal electrode partially overlaps the second capacitor electrode.

8 . 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 includes a first section positioned on the first protective insulating film so as to overlap the first capacitor electrode, a second section positioned on the second protective insulating film so as not to overlap the second capacitor electrode, and a third section connecting the first and second sections, and

wherein the first and second unit capacitors are stacked such that 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 that the first protective insulating film in the first unit capacitor and the first protective insulating film in the second unit capacitor face each other.

9 . The thin film capacitor as claimed in claim 8 ,

wherein the second terminal electrode includes a fourth section positioned on the first protective insulating film so as not to overlap the first capacitor electrode, a fifth section positioned on the second protective insulating film so as to overlap the second capacitor electrode, and a sixth section connecting the fourth and fifth sections, and

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

10 . The thin film capacitor as claimed in claim 9 , further including a third unit capacitor having a same configuration as those of the first and second unit capacitors,

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

11 . The thin film capacitor as claimed in claim 10 , wherein the first, 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.

12 . The thin film capacitor as claimed in claim 9 , further comprising a solder provided between the fourth section of the second terminal electrode included in the first capacitor electrode and the fourth section of the second terminal electrode included in the second capacitor electrode.

13 . The thin film capacitor as claimed in claim 9 , wherein the fifth section of the second terminal electrode is larger than the fourth section of the second terminal electrode.

14 . The thin film capacitor as claimed in claim 8 , further comprising a solder provided between 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.

15 . The thin film capacitor as claimed in claim 8 , wherein the first section of the first terminal electrode is larger than the second section of the first terminal electrode.

16 . 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 the first terminal electrode includes a first section positioned on the first protective insulating film so as to overlap the first capacitor electrode, a second section positioned on the second protective insulating film so as not to overlap the second capacitor electrode, and a third section connecting the first and second sections, and

wherein the first section of the first terminal electrode includes a first sub-section overlapping the first capacitor electrode without overlapping the second capacitor electrode and a second sub-section overlapping the first and second capacitor electrodes.

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

wherein the second terminal electrode includes a fourth section positioned on the first protective insulating film so as not to overlap the first capacitor electrode, a fifth section positioned on the second protective insulating film so as to overlap the second capacitor electrode, and a sixth section connecting the fourth and fifth sections, and

wherein the fifth section of the second terminal electrode includes a third sub-section overlapping the second capacitor electrode without overlapping the first capacitor electrode and a fourth sub-section overlapping the first and second capacitor electrodes.

18 . The thin film capacitor as claimed in claim 17 , wherein the second sub-section of the first section of the first terminal electrode partially overlaps the fourth sub-section of the fifth section of the second terminal electrode.

19 . The thin film capacitor as claimed in claim 16 , wherein the first section of the first terminal electrode is larger than the second section of the first terminal electrode.