THICK FILM INDUCTOR WITH FERROMAGNETIC CORE

• US 3,798,059 A
• Filed: 04/20/1970
• Issued: 03/19/1974
• Est. Priority Date: 04/20/1970
• Status: Expired due to Term

• Current Assignee: RCA Corporation
• Original Assignee: Brian Astle, Jean Marie Guiot
• Inventors: Astle, Brian, Guiot, Jean Marie
• Primary Examiner(s): Leavitt, Alfred L.
• Assistant Examiner(s): Weston, Caleb
• Application Number:
  US05/029,957
• Time in Patent Office: 1,429 Days
• Field of Search: 336/200 117/212,215,240,217,227,235,239 252/519
• US Class Current: 336/229
• CPC Class Codes: H01F 1/0027 Thick magnetic films forming thick magnetic films H01F41/16
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 2017/0046 with a conductive path having a bridge
• CPC Class Codes: Y10T 29/49076 From comminuted material
• CPC Class Codes: Y10T 29/4908 Acoustic transducer
• CPC Class Codes: Y10T 428/24413 Metal or metal compound
• CPC Class Codes: Y10T 428/24909 Free metal or mineral containing
• CPC Class Codes: Y10T 428/31533 Of polythioether

Abstract

Thick film inductor suitable for hybrid integrated circuits comprising successive layers of powdered sintered ferromagnetic material in a cured catalyst-hardenable resin binder and a pattern of conductors comprising powdered metal in a cured catalyst-hardenable resin.

Claims

2. A method according to claim 1 including depositing a second layer of ferromagnetic particles in a catalyst-hardenable resin binder on top of said conductor pattern and said first layer.

3. An inductor for a thick-film hybrid circuit comprising:

an insulating substrate, a layer on said substrate comprising particles of a sintered ferromagnetic substance in a cured catalyst-hardenable resin binder in a proportion of at least about 4 to 1 by weight, a pattern of conductors on said layer constituting an inductance, said conductors comprising metal particles in a cured catalyst-hardenable resin binder.

4. An article according to claim 3 in which the percentage of ferromagnetic material in said layer is about 85.

5. An article according to claim 4 in which said ferromagnetic material is a ferrite.

6. An article according to claim 3 in which said resin in said layer and in said pattern of conductors is an epoxy resin.

7. An article according to claim 3 in which said pattern of conductors is a filamentary spiral.

8. An article according to claim 3 including a second layer of ferromagnetic particles in a catalyst-hardenable resin binder.

9. An article according to claim 8 including a second pattern of conductors on said second layer, connected to said first-mentioned pattern of conductors.

10. An article according to claim 9 in which both of said patterns of conductors are filamentary spirals.

11. An article according to claim 3 in which said layer of ferromagnetic particles and resin binder has the shape of an annulus and said pattern of conductors is a toroidal winding around said annulus.

12. An article according to claim 11 in which said toroidal winding has a ribbon-like configuration.

13. An article according to claim 3 in which said layer of ferromagnetic particles in said resin binder is recessed within said substrate.