Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Reexamination Certificate
1999-10-04
2001-10-09
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
C174S059000, C174S050510, C174S050520
Reexamination Certificate
active
06300566
ABSTRACT:
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The invention relates to an electrical connection configuration for connecting a circuit carrier to conductor tracks of a conductor-track carrier, and also to a method for producing an electrical connection of this type.
In motor vehicle electronics, in particular, it is often necessary to connect control electronics to a conductor. In motor vehicle drives, in particular, there is an increasing need to integrate control electronics in the engine or in the transmission. For this purpose, the control circuit fitted on a circuit carrier frequently has to be shielded from the oils that are used in engines and transmissions and contain additives that are extremely chemically aggressive. At the same time, however, electrical conductors have to be guided through a shield in order that components of the engine or of the transmission can be controlled electronically.
A connection configuration which is configured for conditions of this type is disclosed in European Patent EP 0 375 271 B1. An electronic unit disposed in a housing is connected via wires to a printed circuit board which establishes an electrical connection through a housing wall. Two different work processes are necessary for placing the electronic unit in the housing and establishing an electrical connection to the printed circuit board using wires. Establishing the electrical connection between the printed circuit board and the electronic unit is laborious in a housing.
U.S. Pat. No. 5,223,855 discloses a heat-generating head for a printer that has a circuit carrier and a conductor-track carrier that are electrically connected to one another. The circuit carrier and the conductor-track carrier are connected by soldering in an overlap region. Since the conductor-track carrier is disposed on the circuit carrier in the overlap region, different process steps are necessary for the fastening of the circuit carrier and the contact-making thereof with the conductor-track carrier. Published, British Patent Application GB 2 248 450 A describes an anisotropic, electrically conductive adhesive which is suitable for obtaining an electrical connection.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide an electrical connection of a circuit carrier to a conductor-track carrier which overcome the above-mentioned disadvantages of the prior art methods and devices of this general type, in which a simple electrical connection between a circuit carrier and conductor tracks of a conductor-track carrier are provided.
With the foregoing and other objects in view there is provided, in accordance with the invention, an electrical connection configuration, including a circuit carrier; a base plate having an elevation covered exclusively by the circuit carrier; a conductor-track carrier having conductor tracks disposed on the base plate; an electrically conductive adhesive disposed on the conductor-track carrier, and the circuit carrier overlapping the conductor-track carrier in an overlap region between the circuit carrier and the conductor-track carrier. In the overlap region the conductor-track carrier is disposed on the base plate and the circuit carrier is disposed on the conductor-track carrier. The circuit carrier is electrically connected to the conductor-track carrier by the electrically conductive adhesive in the overlap region, and the circuit carrier is bonded onto the conductor-track carrier exclusively in a region outside of the elevation.
In accordance with an added feature of the invention, there is an electrically insulating and thermally conductive adhesive bonding the circuit carrier on the base plate.
In accordance with another feature of the invention, the conductor-track carrier is a flexibIe sheet.
In accordance with an additional feature of the invention, there is a housing part disposed on the base plate and the housing part has a cavity formed therein in a region where the housing part meets the base plate. The circuit carrier is disposed in the cavity, and the conductor-track carrier is guided through between the base plate and the housing part into the cavity.
In accordance with a further added feature of the Invention, there is a liquid-resistant adhesive bonding the conductor-track carrier onto the base plate; and a sealing element sealing the conductor-track carrier with respect to the housing part with a result that no liquid can penetrate into the cavity.
With the foregoing and other objects in view there is further provided, in accordance with the invention, a method for electrically connecting a circuit carrier to conductor tracks of a conductor-track carrier, which includes providing a base plate having an elevation; fixing the conductor-track carrier adjacent to the elevation on the base plate with a result that the conductor-track carrier and the elevation form substantially one plane; disposing on a side remote from the base plate an electrically conductive adhesive on the conductor-track carrier in a region free from an insulating cover opposite a conductor track of the conductor-track carrier; and disposing the circuit carrier directly on the base plate and bonding the circuit carrier onto the conductor-track carrier in an overlap region between the circuit carrier and the conductor-track carrier with a result that an electrical connection is produced between at least one of the conductor tracks of the conductor-track carrier and a contact point of the circuit carrier and, at a same time, the circuit carrier being mechanically fixed.
In accordance with an added feature of the invention, there are the steps of placing a housing part having a cavity formed therein on the base plate; disposing the circuit carrier in the cavity; and guiding the conductor-track carrier between the base plate and the housing part into the cavity.
It is preferable for the circuit carrier to be fixed together with the control electronics simultaneously in the housing and to be electrically contact-connected to leads of the conductor-track carrier.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in an electrical connection of a circuit carrier to a conductor-track carrier, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 5223855 (1993-06-01), Ota et al.
patent: 5280413 (1994-01-01), Pai
patent: 2536361A1 (1976-02-01), None
patent: 3315655A1 (1983-11-01), None
patent: 3813565A1 (1989-11-01), None
patent: 4737632A1 (1994-11-01), None
patent: 0375271A2 (1990-06-01), None
patent: 0491401A1 (1992-06-01), None
patent: 2248450A (1992-04-01), None
patent: 92/10011 (1992-06-01), None
Franzen Frank
Fritzsche Christian
Scheuerer Ulf
Greenberg Laurence A.
Lerner Herbert L.
Ngo Hung V
Reichard Dean A.
Siemens Aktiengesellschaft
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