FR2634617A1 - Fitted electronic module - Google Patents

Abstract

The invention relates to an electronic module of the type comprising a printed circuit 1 carrying electronic components and mounted in a casing, the assembly being equipped with connection means. The module according to the invention is characterised in that the said casing is constituted by a ring 3 made of synthetic material overmoulded onto a cut-out connection circuit 8 which includes connection leads (strips) 5 on the outside as well as electrical-connection and positioning pins 7 arranged so as to project from the said ring 3 and interacting with holes of the printed-circuit 1. Application to the mounting of printed circuits.

Description

Nested electronic module.

The invention relates to an electronic module of the type comprising a printed circuit carrying electronic components and mounted in a housing, the assembly being provided with connection means.

In known electronic modules, the printed circuit with its components, the housing, and the connection means are generally manufactured separately and then assembled.

When the printed circuit carries both bonded surface components and soldered electronic chips, the assembly operations are carried out separately. It is then necessary to assemble at least one connector and to put the whole in case. These operations are long and labor-intensive.

The present invention aims to simplify the assembly of a module of the type described in the introduction, while ensuring a higher quality of mounting, connection, if necessary sealing and / or cooling of the components.

To this end, the electronic module according to the invention is characterized in that said housing is constituted by a crown made of synthetic material overmolded on a cut connection circuit comprising connection tabs on the outside as well as electrical connection pins and positioning arranged on the inside of said crown and cooperating with holes in the printed circuit.

Thanks to the module housing according to the invention, the soldering of the printed circuit on the connection pins and the soldering of the electronic components on the printed circuit can be done in a single wave soldering pass, with precise and safe positioning of the circuit. The housing is equipped with connection means with the outside as well as means for connection of the printed circuit, which simplifies both manufacturing and assembly.

Advantageously, said electrical connection and positioning pins are elastically deformable, which makes it possible to absorb the geometric differences.

The external connection tabs can be housed in a connector housing and in one piece with the crown. They can also project directly from the crown.

The invention will be clearly understood on reading the following description made with reference to the accompanying drawing in which: - Figure 1 is a schematic sectional view of a module according to an exemplary embodiment of the invention, - Figure 2 is a schematic perspective view of a connection circuit of the module of FIG. 1, and - FIG. 3 is a schematic perspective view of the module housing of FIG. 1, molded onto the circuit of FIG. 2.

FIG. 1 represents a module according to the invention in which there is a printed circuit 1, associated with coolers 2.

After having been fitted with its components, the printed circuit 1 is placed in a module composed of a crown 3 made of insulating plastic material in which are overmolded a number of connections of tinned conductive material and which can terminate so as to produce a connector. 4 or an output connection 5 external to the module.

The installation of the printed circuit 1 in the crown 3 equipped with its connection tabs makes it possible to position the circuit 1 at the rim 6 of the outer crown 3 so as to carry out the soldering operation of the electronic components and the printed circuit to the connection tabs of the crown 3 in a single wave solder pass. This precise positioning of the circuit 1 is ensured by pins 7 protruding inside the crown 3, and cooperating with holes in the printed circuit 1.

Figures 2 and 3 show by way of example an embodiment of the crown 3 forming a housing in which are molded the various connection tabs necessary for the realization of the circuit. It goes without saying that for the molding operation, one or more clusters 8 and 8 ′ are used which are placed in the mold. A part of the cluster is then separated from the part to make the connections necessary for the realization of the module.

 The connection pins 7 are positioned inside the crown 3 at a defined dimension 9, so as to receive and position the printed circuit constituting the electrical part of the module.

In order to absorb the geometrical differences provided by the stacks of circuit 1, of insulators, of coolers and to obtain a good seal, the connection and positioning pins 7 of the printed circuit 1 comprise an elastic part 10.

The module can be closed; in known manner, by welded covers 11,12.

Claims (4)

1.- Electronic module of the type comprising a printed circuit carrying electronic components and mounted in a housing, the assembly being provided with connection means, characterized in that said housing is constituted by a crown (3) of overmolded synthetic material on a cut-out connection circuit (8) comprising connection tabs on the outside (5) as well as pins (7) for electrical connection and for positioning arranged projecting from said ring (3) and cooperating with holes in the circuit printed (1).  2.- Module according to claim 1, characterized in that said pins (7) of electrical connection and positioning are elastically deformable. 3.- Module according to one of claims 1 and 2, characterized in that the external connection tabs (5) are housed in a housing (4) forming a connector and in one piece with the crown (3). 4.- Module according to one of claims 1 to 3, characterized in that the external connection tabs (5) protrude directly outside the crown (3).