Abstract:
An electrical connector includes an insulative housing having a shielding shell made of a conductive material fitted thereto. The housing has two groups of pins separated by a central slot defined therebetween with a conductive plate received therein. The conductive plate is in electrical connection with the shielding shell. The conductive plate has two resilient fingers formed on a front edge thereof and thus engageable with a counterpart conductive plate of a mating connector. The resiliency of the fingers provides a positive engagement between the two conductive plates thereby establishing a sound electrical connection therebetween. This allows electrostatic charges on the conductive plates to be effectively removed through the shielding shell.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to an electrical connector, and particularly to a low profile electrical connector. 
     2. The Prior Art 
     Electrical connectors for input/output port connection are usually provided with a metal shielding shell fitting over and surrounding a mating projection of the connector in order to eliminate electromagnetic interference (EMI). The shielding shell is electrically connected to a circuit board on which the connector is mounted whereby electrostatic charges are discharged. Examples of such shielding shells are disclosed in U.S. Pat. Nos. 4,943,244, 5,066,237, 5,104,326, 5,125,853, 5,218,294, 5,304,069 and 5,591,050. However, the connectors disclosed in these patents have shielding shells positioned between two mating connectors which may not be properly engaged with each other whereby an electrical discontinuity exists when grounding the shielding shell. This adversely affects the protection against EMI provided by the shielding shells. 
     To overcome the problem of electrical discontinuity, the shielding shell is provided with raised or projecting portion(s) or resilient member(s) which allow a better physical engagement to be established between the shielding shells of two mating connectors. This is known from U.S. Pat. Nos. 4,938,704 and 5,567,169. 
     However, with the rapid development of computer and telecommunication technology, problems associated with electrostatic discharge (ESD) and cross talk arise. In a connector having multiple rows of pins, the cross talk problem is conventionally resolved by adding a conductive plate or a metal sheet between adjacent rows. When connecting two mating connectors, the conductive plates of the two connectors are brought into contact with each other thereby establishing an electrical engagement therebetween. This technique is taught by U.S. Pat. Nos. 4,824,377, 5,066,240 and 5,567,168. However, conventionally, the conductive plate is provided with a substantially straight mating edge. Thus, the mating edges of the conductive plates of the mating connectors may not be in positive contact engagement with each other due to manufacturing tolerances. 
     It has also been proposed to provide metal bars on the mating surface of a connector. The metal bars have such a length that allows the bars to contact the mating connector before contacting the pins of the connector. As shown in U.S. Pat. No. 4,179,178 and Taiwan Patent Application Nos. 86204553 and 86206415. This, although providing a better solution, requires a complicated structure of the connector thereby increasing manufacturing cost. Moreover, the connector is not protected from cross talk. 
     It is thus desirable to have an electrical connector which can overcome the problems of the prior art. 
     SUMMARY OF THE INVENTION 
     Accordingly, an object of the present invention is to provide an electrical connector comprising a grounding device which allows a positive electrical engagement to be established between two mating connectors. 
     Another object of the present invention is to provide an electrical connector comprising means for quickly and effectively discharging electrostatic charges accumulated thereon. 
     Another object of the present invention is to provide an electrical connector wherein a cross talk suppressing member is provided and electrically connected to a grounding shell thereby effectively suppressing cross talk. 
     A further object of the present invention is to provide an electrical connector wherein an electrical engagement thereof with a mating connector is provided by means of resilient members thereby ensuring a sound connection therebetween. 
     To achieve the above objects, an electrical connector in accordance with the present invention comprises an insulative housing having a shielding shell made of a conductive material fitted thereto. The housing has two groups of pins separated by a central slot defined therebetween with a conductive plate received therein. The conductive plate is in electrical connection with the shielding shell. The conductive plate has two resilient fingers formed on a front edge thereof and thus engageable with a counterpart conductive plate of a mating connector. The resiliency of the fingers provides a positive engagement between the two conductive plates thereby establishing a sound electrical connection therebetween. This allows electrostatic charges on the conductive plates to be effectively removed through the shielding shell. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will be apparent to those skilled in the art by reading the following description of preferred embodiments thereof, with reference to the accompanying drawings, in which: 
     FIG. 1 is an exploded view of an electrical connector constructed in accordance with a first embodiment of the present invention; 
     FIG. 2 is an assembled view of FIG. 1; 
     FIG. 3 is a cross-sectional view taken along line III--III of FIG. 2; 
     FIG. 4 shows cross-sectional view of FIG. 3 connected to a mating connector; 
     FIG. 5 is an exploded view of an electrical connector constructed in accordance with a second embodiment of the present invention; 
     FIG. 6 is an assembled view of FIG. 5; 
     FIG. 7 is a cross-sectional view taken along line VII--VII of FIG. 6; and 
     FIG. 8 is a plan view showing a conductive plate constructed in accordance with a further embodiment of the present invention to be incorporated in the connector of FIG. 1. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to the drawings and in particular to FIGS. 1 and 2, wherein an electrical connector constructed in accordance with a first embodiment of the present invention, generally designated by reference numeral 10, is shown, the electrical connector 10 comprises an insulative housing 12 having a mating projection 18 extending from one side face thereof. A shielding shell 19 made of a conductive material, such as metal, is fit over the mating projection 18. The mating projection 18 has a free mating face 20 and defines two receptacle slots 22 therein. The mating projection 18 also defines a central slot 26 substantially co-extensive therewith. 
     The housing 12 defines a plurality of pin receiving channels 24 in communication with the receptacle slots 22. Each channel 24 receives and retains a conductive pin 14 with a free end 25 thereof being located inside the corresponding receptacle slot 22. 
     A conductive plate 16, such as a metal sheet, has an elongate body 29 received in the central slot 26 of the housing 12. The conductive plate 16 is dimensioned to have a front edge 30 thereof substantially flush with the free mating face 20 of the mating projection 18. However, it should be noted that if desired, the conductive plate 16 may be dimensioned whereby the front edge 30 extends beyond the free mating face 20 or is completely received inside the central slot 26. 
     The front edge 30 of the conductive plate 16 has at least one resilient finger 32 projecting therefrom. The resilient fingers 32 are dimensioned to have at least a portion thereof extending beyond the free face 20 of the mating projection 18 of the housing 12, as shown in FIGS. 2 and 3. In the embodiment illustrated, the conductive plate 16 has two resilient fingers 32 extending from the body 29 of the conductive plate 16 in a cantilevered fashion with an arced or curved central portion thereof extending beyond the front edge 30. However, the resilient fingers 32 may have a different configuration which provides resiliency in a direction toward/away from the front edge 30. The resilient fingers 32 provide means for a firm physical contact with a counterpart conductive plate 48 of a mating connector 46 as shown in FIG. 4. This allows a positive electrical engagement to be established between the connectors 10, 48. 
     Referring back to FIGS. 1 and 3, the conductive plate 16 also has a rear edge 34 which defines a first cutout 36a for receiving a projection 45a extending from the housing 12 into the central slot 26 for retaining the conductive plate 16 in the central slot 26. The projection 45a is provided with notches (not labeled) engaging with barbs 38 formed on the conductive plate 16 and extending into the cutout 36a thereby securing the conductive plate 16 in the central slot 26. 
     If desired, the rear edge 34 of the conductive plate 16 may be provided with additional cutouts 36 for receiving corresponding projections 45 extending from the housing 12 into the central slot 26 for positioning purposes. 
     The conductive plate 16 has two longitudinal ends each forming a resilient arm 40. Each arm 40 has a sideways extension 42 and the central slot 26 is further defined with an extension slot (not labeled) for receiving the sideways extension 42 of the arm 40. The extension 42 of the arm 40 is positioned such that the extension 42 is overlapped and thus securely retained in the slot 26 by the shielding shell 19. The resiliency of the arm 40 provides a positive engagement between the extension 42 thereof and the shielding shell 19. Thus, a secure electrical connection is formed therebetween. 
     The resilient arm 40 may be connected to the body 29 of the conductive plate 16 by means of a reinforcement rib 44 extending from a free end of the arm 40 to the body 29. This reinforces the structure of arm 40 thereby protecting the arm 40 from being damaged during the manufacturing process of the conductive plate 16. 
     However, it should be noted that the reinforcement rib 44 may be removed, if desired. This is illustrated in another embodiment of the present invention shown in FIG. 8. In FIG. 8, a conductive plate, designated by reference numeral 16&#39;, is shown. The conductive plate 16&#39; has a structure similar to that of the conductive plate 16 of the first embodiment. The conductive plate 16&#39; comprises an elongate body 29&#39; forming resilient fingers 32&#39; on a front edge thereof, cutouts 36&#39;, 36a&#39; on a rear edge thereof and a resilient arm 40&#39; on each longitudinal end of the body 29&#39;. Each of the arms 40&#39; is constructed as a cantilevered arm having a free end on which a sideways extension 42&#39; is formed. 
     The connector 10 of the first embodiment illustrated in FIGS. 1-4 is a receptacle-type connector. A counterpart plug-type connector in accordance with the present invention is illustrated in FIGS. 5-7 as a second embodiment. 
     Referring to FIGS. 5-7, a plug-type connector in accordance with the present invention which is designated by reference numeral 52 comprises an insulative housing 54 defining a plurality of passages 62 receiving conductive pins 56 therein. Two tongue plates 60 extend from a mating face 68 of the housing 54. The tongue plates 60 have pin receiving channels 64 defined therein for receiving free ends 57 of the pins 56. The tongue plates 60 are receivable in and engageable with slots defined in a mating receptacle type connector. 
     A shielding shell 84 is attached to the mating face 68 of the housing 54 for surrounding the tongue plates 60. 
     The housing 54 defines a central slot 66 between the two tongue plates 60 and exposed to the mating face 68 thereof for receiving a conductive plate 58 therein. The conductive plate 58 has a front edge 70 on which at least one resilient finger 72 is provided. The resilient finger 72 extends beyond the front edge 70 of the conductive plate 58. In the embodiment illustrated, the conductive plate 58 has two resilient fingers 72 provided on the front edge 70 thereof. The conductive plate 58 is dimensioned to have the front edge 70 thereof substantially flush with the mating face 68 as shown in FIG. 7 whereby the resilient fingers 72 project beyond the mating face 68 of the housing 54. 
     The conductive plate 58 has a rear edge 74 which forms at least one positioning projection 76a for being received in a corresponding recess 82a (FIG. 7) defined in the housing 54 in communication with the slot 66. Preferably, the projection 76a forms barbs 78 on opposite sides thereof for engaging with side walls of the recess 82a. If desired, additional positioning projections 76 may be provided on the rear edge 74 of the conductive plate 58 for being received in additional recesses 82 defined in the housing 54. 
     The conductive plate 58 has two longitudinal ends each forming a retaining tab 80 for being received in a recessed section 67 defined in the mating face 68 of the housing 54. The retaining tab 80 is located at such a position with respect to the housing 54 whereby the retaining tab 80 is overlapped and thus fixed in the recessed section 67 by the shielding shell 84 as shown in FIG. 7. This secures the conductive plate 58 in the slot 66 of the housing 54 and provides a secure electrical connection between the conductive plate 58 and the shielding shell 84. 
     Although the present invention has been described with reference to the preferred embodiments thereof, it is apparent to those skilled in the art that there are a variety of modifications and changes that may be made without departing from the scope of the present invention which is intended to be defined by the appended claims.