Inductive devices for printed wiring boards
US4755783A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1986 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Nov 18, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2201/051
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Inductive devices, i.e., transformers, coils, inductors, etc. are produced from a rolled flexible circuit. The flexible circuit is comprised of a dielectric substrate having a circuit pattern thereon. The circuit pattern is configured such that, upon rolling, one or more coils is formed thereby defining an inductor, transformer, etc. Additionally, these inductive devices may be easily shielded using a ground plane in the flexible circuit. The rolled flexible circuit may be secured in several ways including an adhesive or by using a thermoplastic bonding layer which acts to heat seal the circuit together. The inductive devices of the present invention may be wrapped or rolled about a permeable core which improves inductance. Inductor devices manufactured in accordance with the present invention have the advantages of being small, surface mountable, inexpensive to manufacture and being capable of insertion onto printed wiring boards using automated insertion equipment. The small size of the inductor devices permit the present invention to take up only small areas on the circuit board thereby conserving valuable "real estate" on the printed wiring board.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.