Multi-Layer Ceramic Capacitor and Method of Producing the Same

Patent metadata

Field	Value
Publication number	US-2016351335-A1
Application number	US-201615167267-A
Country	US
Kind code	A1
Filing date	May 27, 2016
Priority date	May 29, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A multi-layer ceramic capacitor according to an embodiment of the present invention includes a multi-layer, side margins and offset sections. The multi-layer includes internal electrodes and dielectric layers alternately laminated. The side margins are configured of a dielectric and disposed to cover side faces of the multi-layer. The offset sections are made with amorphous areas or gap areas. The offset sections are formed between the internal electrodes and the side margins such that ends at side faces of the internal electrodes are offset from the side faces to an inward direction of the multi-layer.

First claim

What is claimed is:

1 . A multi-layer ceramic capacitor, comprising:
a multi-layer where internal electrodes and dielectric layers are alternately laminated; side margins configured of a dielectric and disposed to cover side faces of the multi-layer; and offset sections formed between the internal electrodes and the side margins such that ends at side faces of the internal electrodes are offset from the side faces to an inward direction of the multi-layer and made with amorphous areas or gap areas.

2 . The multi-layer ceramic capacitor according to claim 1 , where
a width of each offset section is 0.1 μm or more.

3 . A method of producing a multi-layer ceramic capacitor, comprising:
forming a multi-layer where ceramic sheets configuring dielectric layers and electrical conductors configuring internal electrodes are alternately laminated; cutting side faces of the multi-layer so as to expose the electrical conductors; etching the exposed electrical conductors at the side faces of the multi-layer; forming a capacitor body by disposing side margins composed of ceramic so as to cover the side faces of the multi-layer after etching; and sintering the capacitor body.

4 . The method of producing a multi-layer ceramic capacitor according to claim 3 , wherein
etching is carried out with acid, by ion bombardment or by laser irradiation.

5 . The method of producing a multi-layer ceramic capacitor according to claim 4 , wherein
etching is carried out with nitric acid.

6 . The method of producing a multi-layer ceramic capacitor according to claim 5 , wherein
etching is carried out with concentrated nitric acid.

7 . The method of producing a multi-layer ceramic capacitor according to claim 4 , wherein
in the etching, laser is irradiated under the condition that the electrical conductors are selectively removed.

8 . The method of producing a multi-layer ceramic capacitor according to claim 4 , wherein
in the etching, the laser irradiation is carried out using nanosecond pulse laser, picosecond pulse laser or femtosecond pulse laser.

9 . The method of producing a multi-layer ceramic capacitor according to claim 4 , wherein
in the etching, the laser irradiation is carried out using green laser having a wavelength band of 532 nm, UV (ultraviolet) laser having a wavelength band of 355 nm or infrared ray laser having a wavelength band of 1064 nm.

Assignees

• Taiyo Yuden Kk

Inventors

• Kato Yoichi
• Mizuno Kotaro
• Konishi Yukihiro
• Kato Yasunari
• Sato Yosuke
• Wakayanagi Hidenori
• Kobayashi Joji
• Kogure Toshimitsu

Classifications

• H01G4/30 Primary

  Stacked capacitors (H01G4/33 takes precedence) · CPC title

• H01G4/12

  Ceramic dielectrics {(H01G4/085 takes precedence)} · CPC title

• H01G13/006

  Apparatus or processes for applying terminals · CPC title

• H01G4/012 Primary

  Form of non-self-supporting electrodes · CPC title

• C23F1/16

  Acidic compositions (C23F1/42 takes precedence) · CPC title