EMI Mask

The present invention relates to a mask, and more particularly to an EMI mask for use with a stacked connector assembly.

0.8 mm pitch trapezoidal shielded connector is used with very high density cable interconnect (VHDCI) and the Standard Proposal No. 3652-A, issued by Electronic Industries Association, suggests details specification for it. According to the Standard, one of the applications of such connector is the Fixed board right angle stacked, i.e. upper and lower receptacle connectors being stacked together, which can be referred to the copending application Ser. No. 09/053,406 filed Apr. 1, 1998. Each of upper and lower receptacle connectors is shielded with an EMI shroud which surrounds a mating island thereof. Since the upper and lower connectors are manufactured separately, the EMI shrouds thereof are also made separately and assembled respectively for easy assembling wherein interconnecting means is formed on the interface portions, i.e., the longitudinal sides, of both the shroud and the connector housing for securing the shroud to the connector housing. Therefore, when the connectors are stacked based on the interface portions, i.e., the upper longitudinal side of the lower connector and the lower longitudinal side of the upper connector, a gap which is designed to forgiving the possible interference between such interconnecting means of both connectors around the interface portion, is unaviodably formed between the shroud of the upper connector and that of the lower connector. The stacked connector assembly may function well in lower frequency. However, in high frequency application, a gap between the upper and lower EMI shroud becomes a leakage in which the EMI will adversely affect the signal transmission with the cable.

An objective of this invention is to provide an EMI mask to effectively block the EMI between stacked connectors.

In order to achieve the objective set forth, an EMI mask for use with a connector assembly configured with first and second connectors comprises a plate section defining first and second openings corresponding to the connectors respectively. End tabs extend rearward from transversal ends of the plate for attaching the plate section to a housing of the connector assembly.

According to one aspect of the present invention, a peripheral flange extends forward and inward from a rim of each opening thereby electrically abutting a shroud of the corresponding connector.

These and additional objects, features, and advantages of the present invention will become apparent after reading the following detailed description of the preferred embodiment of the invention taken in conjunction with the appended drawings.

FIG. 1 is a perspective view of an EMI mask in accordance with the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a perspective view of a stacked connector assembly with the EMI mask mounted thereon;

FIG. 4 is a side elevational view of FIG. 3;

FIG. 5 is a side elevational view of FIG. 3 with plug connectors mated thereto; and

FIG. 6 is an enlarged view showing a flange of the EMI shield is pressed by an inserted EMI shroud from a reverse angle.

Referring to FIGS. 1, 2, 3 and 4, an EMI metal mask 1 in accordance with the present invention comprises a plate section 10 defining first and second D-shaped openings 11, 12. The openings 11, 12 have a trapezoidal shape and are separated by an elongate bar section 13 on which two dimples 13a are formed for electrical engagement with the metal shrouds 31a, 32a of the connectors 31, 32. The plate section 10 further defines four holes 14 for insertion of a bolt member (not shown). End tabs 15 extend rearward from transversal ends 10a of said plate section 10 for attaching said plate section 10 to housing 31, 32 of said connector assembly 30. A pair of tail sections 15a extends rearward from the end tab 15 for electrical engagement of the aforementioned bolt member. A side flap 16 extends rearward from the upper longitudinal side of the plate section 10 and cooperates with the two end tabs 15 to jointly define a receiving space (not labeled) for reception of the housings 31, 32. The side flap 16 is interlocked with said end tabs 15 by latches 15b. Opposite to the side flap 16, a pair of resilient retention tags 17 extend rearward from the lower longitudinal side of the plate section 10 and are adapted to be receiveably engaged within a pair of corresponding recesses (not shown) for retaining the mask 1 to the connector assembly 30.

In addition, each of the openings 11, 12 forms a peripheral flange 11a, 12a extending forward and inward from a rim (not labeled) thereof. The caliber of the openings 11, 12 is slightly smaller than the outer caliber of shroud 31a, 32a of the connectors 31, 32 therefore a grounding path between the EMI mask 10 and the shrouds 31a, 32a is established.

Referring to FIGS. 3 and 4, the connector assembly 30 includes the upper receptacle connector 31 and the lower receptacle connector 32. Each connector 31, 32 includes an island section 31b, 32b defining a cavity 31c, 32c therein. A plurality contacts 31d, 32d are assembled therein for mating with a complementary plug connector 40 (FIG.5 or 6). Each island section 31b, 32b is enclosed with the shroud 31a, 32a.

Referring to FIGS. 5 and 6, in assembly the island section 31b, 32b are firstly aligned with the openings 11, 12 respectively. Then the EMI mask 1 is assembled to the connectors 31, 32 whereby the peripheral flange 11a, 12a is electrically connected with the shroud 31a, 32a. In addition, when the plug connectors 40 (only a portion is shown) are assembled to the island section 31b, 32b, a front tip 41a of a metal shroud 41 of the plug connector 40 abuts against the corresponding peripheral flange 11a (12a) thereby enhancing the grounding effect therebetween.

It is noted that the bar section 13 completely and efficiently shields the gap between the upper connector 31 and the lower connector 32 wherein the two mutually reversely positioned openings 11 and 12 are provided by two sides of said bar section 13 for receiving the corresponding island sections 31a and 32b therein, respectively. Additionally, a pair of holes 14 are provided by two ends of each of the openings 11, 12 in alignment with the corresponding bolt holes 37 of the connector 31, 32 for allowing a bolt to extend therethrough.

While the present invention has been described with reference to a specific embodiment, the description is illustrative of the invention and is not to be construed as limiting the invention. Various modifications to the present invention can be made to the preferred embodiment by those skilled in the art without departing from the true spirit and scope of the invention as defined by the appended claims.