Dielectric articles and condensers using the same

• US 4,873,610 A
• Filed: 01/31/1989
• Issued: 10/10/1989
• Est. Priority Date: 03/20/1986
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Shimizu, Akira, Kaneko, Norio
• Primary Examiner(s): GRIFFIN, DONALD
• Application Number:
  US07/303,999
• Time in Patent Office: 252 Days
• Field of Search: 361/328-330, 361/311-313, 361/320, 361/321, 501/134-138, 29/25.42, 264/61, 252/62.3 BT
• US Class Current: 361/313
• CPC Class Codes: B32B 18/00 Layered products essentially comprising ceramics, e.g. refractory products
• CPC Class Codes: C04B 2237/32 Ceramic
• CPC Class Codes: C04B 2237/34 Oxidic
• CPC Class Codes: C04B 2237/346 Titania or titanates
• CPC Class Codes: C04B 2237/368 Silicon nitride
• CPC Class Codes: C04B 2237/704 of one or more of the ceramic layers or articles
• CPC Class Codes: C04B 35/4682 based on BaTiO3 perovskite phase
• CPC Class Codes: C04B 35/47 based on strontium titanates
• CPC Class Codes: H01B 3/12 ceramics
• CPC Class Codes: H01G 4/20 using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06 H01G4/12 takes precedence

Abstract

A dielectric article comprises a laminate of plural thin dielectric material layers wherein at least one kind of combination of dielectric material layers different in temperature characteristics of permittivity is present and thickness of each layer is 1000 Å or less but not less than of monatomic layer.

Claims

1. A dielectric article which comprises a plurality of laminated repeating unit cells, each unit cell comprising at least two thin dielectric material layers, one of said layers having temperature characteristic of permittivity different from the other and wherein the thickness of each layer is 1000Å

or less but not less than of monatomic layer.

2. A dielectric article according to claim 1 wherein said unit cell comprises two kinds of dielectric material layers different in temperature characteristic of permittivity.

3. A dielectric article according to claim 1 which comprises three kinds of dielectric material layers different in temperature characteristic of permittivity.

4. A dielectric article according to claim 3 wherein the three kinds of dielectric material layers are regularly arranged and laminated.

5. A dielectric article according to claim 1 wherein the dielectric is selected from the group consisting of BaZrO₃, CaTiO₃, La₂ O₃, TiO₂, BaTiO₃, PbTiO₃, SrTiO₃, Si₃ N₄ and (Pb_x La.sub.(1-x))(Zr_y Ti.sub.(1-y) O₃.

6. A dielectric article according to claim 1 wherein the repetition number of said unit cell is 3-100.

7. A dielectric article according to claim 1 wherein the thickness of said dielectric article is 100Å

or more.

8. A dielectric article according to claim 1 wherein the thickness of said dielectric article is 500 Å

or more.

9. A condenser having a pair of electrodes and a dielectric article sandwiched between said electrodes which article comprises a plurality of laminated repeating unit cells, each unit cell comprising at least two thin dielectric material layers, one of said layers having temperature characteristic of permittivity different from the other and wherein the thickness of each layer is 1000 Å

or less but not less than of monatomic layer.

10. A condenser according to claim 9 wherein said unit cell comprises two kinds of dielectric material layers different in temperature characteristic of permittivity.

11. A condenser according to claim 9 wherein said unit cell comprises three kinds of dielectric material layers different in temperature characteristics of permittivity.

12. A condenser according to claim 11 wherein the three kinds of dielectric material layers are regularly arranged and laminated.

13. A condenser according to claim 9 wherein the dielectric is selected from the group consisting of BaZrO₃, CaTiO₃, La₂ O₃, TiO₂, BaTiO₃, PbTiO₃, SrTiO₃, Si₃ N₄, and (Pb_x La.sub.(1-x)) (Zr_y Ti.sub.(1-y))O₃.

14. A condenser according to claim 9 wherein the repetition number of said unit cell is 3-100.

15. A condenser according to claim 9 wherein the thickness of said dielectric article is 100 Å

or more.

16. A condenser according to claim 9 wherein the thickness of said dielectric article is 500 Å

or more.