Method for fabricating an electronic device

• US 5,055,816 A
• Filed: 06/11/1990
• Issued: 10/08/1991
• Est. Priority Date: 06/26/1989
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Stengel, Robert E., Altman, Leonard F.
• Primary Examiner(s): ECHOLS, PERCY W
• Application Number:
  US07/536,048
• Time in Patent Office: 484 Days
• Field of Search: 29/602.1, 29/852, 336/200, 336/229
• US Class Current: 336/200
• CPC Class Codes: H01F 17/0033 with the coil helically wound around a magnetic core
• CPC Class Codes: H01F 2017/004 with the coil helically wound around an axis without a core
• CPC Class Codes: H01F 41/041 Printed circuit coils apparatus or processes for manufacturing printed circuits in general H05K3/00
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/49165 by forming conductive walled aperture in base

Abstract

A method of fabricating an electronic device on a carrier (14) is provided wherein the method comprises forming a hole pattern in the carrier (14), and providing a metallization pattern on the carrier, and through the holes (16, 22, etc.) to define the electronic device.

Claims

1. A method of fabricating an electronic device for use as a transformer on a carrier, comprising the steps of:

a) forming a double circular pattern of metallized through-holes uniformly spaced in said carrier;

b) connecting at least triplets of said metallized through-holes to form a first set of substantially triangular metallized areas on a first side of said carrier; and

c) connecting at least triplets of said metallized through-holes to form a second set of substantially triangular metallized areas on a second side of said carrier,

said first and second sets being radially offset to form a pair of primary and secondary opposed coils alternating a selective number of turns of the opposed coils through said carrier and being inductively coupled with one another;

said first and second sets alternately forming at least one primary turn connected via said metallized through-holes beside a secondary turn connected via said metallized through-holes on said carrier, said metallized through-holes being substantially perpendicular to the plane of said carrier.

2. The method of fabricating an electronic device for use as a transformer of claim 1 wherein step (c) comprises said first and second sets forming a pair of primary and secondary toroidal coils crossing each other a selective number of times.

3. An electronic device for use as a transformer on a ceramic carrier, comprising:

said ceramic carrier having a double circular pattern of metallized through-holes uniformly spaced therein;

a first set of substantially triangular metallized areas on a first side of said carrier each component of said first set of substantially triangular metallized areas formed by connecting at least a triplet of said metallized through-holes; and

a second set of substantially triangular metallized areas on a second side of said carrier each component of said second set of substantially triangular metallized areas formed by connecting at least a triplet of said metallized through-holes, said first and second sets skewed radially disposed forming a pair of primary and secondary coils intermixed a selective number of times through said carrier and being inductively coupled with one another.

4. The electronic device of claim 3 wherein said first and second sets forming a pair of primary and secondary coils intermixed through said carrier and being inductively coupled with one another to constitute a microelectronic transformer.