Patent · US Expired

Electric circuit unit

US4967316A · kind A · utility

13Cited by

9References

6Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Ulrich Goebel · Hattersheim, DE
Roland Gerstner · Reutlingen, DE
Walter Roethlingshoefer · Reutlingen, DE
Dietrich Bergfried · Böblingen, DE
Michael Krapp · Nattheim, DE

Key dates

Filing date	Oct 5, 1989
Grant date	Oct 30, 1990
Priority date	—
Expiry date	Oct 5, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P70/50
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An electrical circuit unit, particularly for motor vehicles, features a grounded housing (1) and a printed circuit board (2) which, for protection against incoming and outgoing radiation of electrical noise, is short-circuited at high frequencies to the grounded housing. For this purpose, a noise suppression capacitor (6) on the PC board (2) is connected in series to a second capacitor. This second capacitor is formed by a metallized surface (8) on the board (2) and a metal-filled adhesive, as a first plate, a metal inner surface (11) of the housing (1) as a second plate, and an intermediate passivation or eloxal layer serving as a dielectric (13). The metal-filled adhesive acts to electrically bridge most of the gap between the metallized surface (8) and the housing surface (11), thereby capacitively coupling the metal-filled adhesive to the housing (1) and increasing the capacitance.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.