Method of producing an LC composite part and an LC network part

• US 5,197,170 A
• Filed: 11/15/1990
• Issued: 03/30/1993
• Est. Priority Date: 11/18/1989
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Senda, Atsuo, Fujiki, Yasuo, Kano, Osamu
• Primary Examiner(s): Silbaugh, Jan H.
• Assistant Examiner(s): Fiorilla, Christopher A.
• Application Number:
  US07/613,071
• Time in Patent Office: 866 Days
• Field of Search: 156/89, 156/250, 156/630, 156/664, 29/602.1, 29/25.42, 427/116, 427/123, 427/125
• US Class Current: 29/25.42
• CPC Class Codes: H01G 4/40 Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
• CPC Class Codes: H03H 1/00 Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network constructional details of electromechanical transducers H03H9/00
• CPC Class Codes: H03H 2001/0085 Multilayer, e.g. LTCC, HTCC, green sheets
• CPC Class Codes: H03H 7/0115 comprising only inductors and capacitors H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence
• CPC Class Codes: Y10T 156/1052 with cutting, punching, tearing or severing
• CPC Class Codes: Y10T 29/435 Solid dielectric type
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

A process of forming an LC composite part. The process includes the steps of: forming a substrate having a capacitor section by laminating ceramic sheets having a plurality of capacitor electrodes formed thereon such that the ceramic sheets and electrode layers alternate, sintering the substrate, forming a plurality of coil sections on the sintered substrate, cutting the substrate into composite parts, and electrically connecting the capacitor electrode layers with the coil section.

Claims

1. A method of producing an LC composite part, comprising the steps of:

forming a substrate having a capacitor section including a plurality of capacitor units by laminating ceramic sheets having capacitor electrode layers formed thereof such that said capacitor electrode layers and said ceramic sheets alternate;

sintering the substrate;

forming a coil section including a plurality of spiral coil patterns on the sintered substrate by a thin film forming method;

dividing the laminated substrate having the capacitor section and the coil section into LC composite parts; and

connecting the capacitor electrode with the spiral coil pattern by electrical connection means in each of the LC composite parts.

2. A method of producing an LC composite part as claimed in claim 1, wherein coil patterns are formed on the sintered substrate following the steps of:

forming a conductive film on an entire upper surface of the sintered substrate by the thin film forming method;

forming on the conductive film a resist film corresponding to the coil patterns;

etching the conductive film; and

removing the resist film.

3. A method of producing an LC composite part as claimed in claim 2, wherein the coil patterns formed on the sintered substrate are covered with a resin which has a low dielectric constant.

4. A method of producing an LC composite part as claimed in claim 3, wherein spiral coil patterns are layered on the sintered substrate by repeating a step of forming coil patterns on the sintered substrate and a step of covering the coil patterns with a resin which has a low dielectric constant.

5. A method of producing an LC composite part as claimed in claim 4, wherein said step of forming the substrate includes laminating the substrate with at least one ceramic sheet having no electrode layer formed thereon to cover at least one ceramic sheet having an exposed capacitor electrode layer formed thereon.

6. A method of producing an LC composite part as claimed in claim 4, wherein said step of forming the substrate includes laminating the substrate with a plurality of ceramic sheets having capacitor electrode layers formed thereon, said plurality of sheets being formed between ceramic sheets having no electrode layer formed thereon.

7. A method of producing an LC composite network part, comprising the steps of:

forming a substrate having a capacitor section including a plurality of capacitor networks by laminating ceramic sheets having capacitor electrode layers formed thereon such that said capacitor electrode layers and said ceramic sheets alternate;

sintering the substrate;

forming a coil section having a coil network including a plurality of spiral coil patterns on the sintered substrate by a thin film forming method;

dividing the laminated substrate having the capacitor section and the coil section into LC composite network parts; and

connecting the capacitor electrode with the spiral coil pattern by electrical connection means in each of the LC composite network parts.

8. A method of producing an LC composite network part as claimed in claim 7, wherein coil patterns are formed on the sintered substrate following the steps of:

forming a conductive film on an entire upper surface of the sintered substrate by the thin film forming method;

forming on the conductive film a resist film corresponding to the coil patterns;

etching the conductive film; and

removing the resist film.

9. A method of producing an LC composite network part as claimed in claim 8, wherein the coil patterns formed on the sintered substrate are covered with a resin which has a low dielectric constant.

10. A method of producing an LC composite network part as claimed in claim 9, wherein spiral coil patterns are layered on the sintered substrate by repeating a step of forming coil patterns on the sintered substrate and a step of covering the coil patterns with a resin which has a low dielectric constant.

11. A method of producing an LC composite part as claimed in claim 10, wherein said step of forming the substrate includes laminating the substrate with at least one ceramic sheet having no electrode layer formed thereon to cover at least one ceramic sheet having an exposed capacitor electrode layer formed thereon.

12. A method of producing an LC composite part as claimed in claim 11, wherein said step of forming the substrate includes laminating the substrate with a plurality of ceramic sheets having capacitor electrode layers formed thereon, said plurality of sheets being formed between ceramic sheets having no electrode layer formed thereon.

13. A method of producing an LC part, comprising the steps of:

forming a substrate having a capacitor section including a plurality of capacitor units by laminating ceramic sheets having capacitor electrode layers formed thereon such that said capacitor electrode layers and said ceramic layers alternate, and by laminating the capacitor section with a ceramic sheet having no electrode layer formed thereon to cover exposed capacitor electrode layers;

sintering the substrate;

forming a coil section including a plurality of spiral coil patterns on the sintered substrate by a thin film forming method;

dividing the laminated substrate having the capacitor section and the coil section into LC composite parts; and

connecting the capacitor electrode with the spiral coil pattern by electrical connection means in each of the LC composite parts.

14. A method of producing an LC composite part as claimed in claim 13, wherein coil patterns are formed on the sintered substrate following the steps of:

forming a conductive film on an entire upper surface of the sintered substrate by the thin film forming method;

forming on the conductive film a resist film corresponding to the coil patterns;

etching the conductive film; and

removing the resist film.

15. A method of producing an LC composite part as claimed in claim 14, wherein the coil patterns formed on the sintered substrate are covered with a resin which has a low dielectric constant.

16. A method of producing an LC composite part as claimed in claim 15, wherein spiral coil patterns are layered on the sintered substrate by repeating a step of forming coil patterns on the sintered substrate and a step of covering the coil patterns with a resin which has a low dielectric constant.