Electrical connector having a ceramic body part and a metallic shielding plate molded to the ceramic body part

This patent application relates to a U.S. patent application Ser. No. 16/111,244 filed on Aug. 24, 2018, entitled “ELECTRICAL CONNECTOR HAVING AN IMPROVED TONGUE PORTION,” which is assigned to the same assignee as this application.

1. Field of the Invention

The present invention relates to an electrical connector having a ceramic body, two rows of contacts secured to the ceramic housing, and a metallic shielding plate situated between respective differential signal pairs of the two rows of contacts.

2. Description of Related Arts

China Patent No. 205944552 discloses an electrical connector utilizing ceramic materials in constructing its insulative body or housing. Due to high sintering temperature of ceramic materials, risk of melting an otherwise plastic housing under high temperature is avoided. However, such electrical connector does not shield high frequency signal interference during high frequency signals transmission.

An electrical connector comprises: a body including a ceramic part and an over-mold; an upper row of contacts and a lower row of contacts secured to the ceramic part of the body, each row of contacts including an outermost ground contact and a pair of signal contacts inwardly of the ground contact; and a metallic shielding plate situated between the upper pair of signal contacts and the lower pair of signal contacts, wherein the metallic shielding plate is molded to the ceramic part of the body.

FIG. 1 is a perspective view of an electrical connector in accordance with a first embodiment of the present invention;

FIG. 2 is another perspective view of the electrical connector;

FIG. 3 is an exploded view of the electrical connector;

FIG. 4 is an exploded view of a contact module of the electrical connector;

FIG. 5 is a further exploded view of the contact module omitting an over-mold thereof;

FIG. 6 is a further exploded view of FIG. 5 ;

FIG. 7 is a cross-sectional view of the electrical connector taken along line 7 - 7 in FIG. 1 ;

FIG. 8 is another cross-sectional view of the electrical connector taken along line 8 - 8 in FIG. 1 ;

FIG. 9 is a cross-sectional view of the ceramic part of the electrical connector taken along line 9 - 9 in FIG. 5 ;

FIG. 10 is a perspective view of an electrical connector in accordance with a second embodiment of the present invention;

FIG. 11 is an exploded view of the electrical connector in FIG. 10 ;

FIG. 12 is an exploded view of a contact module of the electrical connector in FIG. 10 ;

FIG. 13 is a further exploded view of the contact module in FIG. 12 omitting an over-mold thereof; and

FIG. 14 is a cross-sectional view of the electrical connector in FIG. 10 taken along line 14 - 14 thereof.

Referring to FIGS. 1 to 7 , an electrical connector 100 of a first embodiment discloses a contact module 1 enclosed by a shielding shell 2 and sealed by a rear sealing member 3 .

Referring to FIGS. 3-7 , the contact module 1 includes a body 11 , two rows of contacts 12 secured to the body 11 , and a pair of metallic shielding plates 1232 situated between an upper row of contacts 121 and a lower row of contacts 122 .

The body 11 includes a base 111 and a tongue 112 . The tongue 112 has a pair of side notches 1121 . The body 11 is constructed of a ceramic part 113 for securing the contacts 12 and an over-mold 114 molded over the combination of the ceramic part 113 and the secured contacts 12 . The ceramic part 113 has a vertical slot 1132 and a horizontal slot 1131 . Notably, in this embodiment, the base 111 is essentially formed by the over-mold 114 . Two opposite faces of the ceramic part 113 form a plurality of contact grooves 1133 to receive the corresponding contacts 12 therein, respectively.

Each contact 12 includes a contacting portion 126 , a soldering portion 128 , and a securing portion 127 between the contacting portion and the soldering portion. Each row of contacts 121 or 122 includes a pair of outermost ground contacts 123 , a respective pair of high-speed signal contacts 125 next to each of the two ground contacts, a respective power contact 124 inwardly of and next to each pair of signal contacts, and other signal contacts. In this embodiment, the ground contact 123 is integral with the metallic shielding plate 1232 as a uni-body which is formed by suitable metal injection molding process, such as sintering in metallurgy powder-related processes known as powder metallurgy, in the slots 1131 and 1132 of the ceramic part 113 of the body 11 . The other contact are stitched, i.e., inserted into the ceramic part 113 of the body 11 . The metallic shielding plate 1232 may be integral with only one or both of the associated upper and lower ground contacts. The horizontal slot 1131 extends between associated upper pair of high-speed signal contacts 125 and associated lower pair of high-speed signal contacts 125 . The metallic shielding plate 1232 has a side protrusion 1231 exposed to a corresponding side notch 1121 .

Referring to FIGS. 1-2 and 7 , the shielding shell 2 , which is made via die-casting, sintering or metal injection molding, has a receiving space 20 for the contact module 1 . The shielding shell 2 includes a rear part 21 and a front part 22 . The rear part 21 has plural soldering legs 211 for clamping to a printed circuit board. On an inner side of the rear part 21 there are two stops 212 . On an outer side of the front part 22 there are two positioning portions 221 .

Referring to FIGS. 8-12 , an electrical connector 200 of a second embodiment discloses a contact module 4 enclosed by a shielding shell 5 and sealed by a rear sealing member 6 .

Referring to FIGS. 9-12 , the contact module 4 includes a body 41 , two rows of contacts 42 secured to the body 41 , and a pair of metallic shielding plates 7 situated between an upper row of contacts 421 and a lower row of contacts 422 .

The body 41 includes a base 411 and a tongue 412 . The tongue 412 has a pair of side notches 4121 . The body 41 is constructed of a ceramic part 413 for securing the contacts 42 and an over-mold 414 molded over the combination of the ceramic part 413 and the secured contacts 42 . The ceramic part 413 has a horizontal slot 4131 .

Each contact 42 includes a contacting portion 426 , a soldering portion 428 , and a securing portion 427 between the contacting portion and the soldering portion. Each row of contacts 421 or 422 includes a pair of outermost ground contacts 423 , a respective pair of high-speed signal contacts 425 next to each of the two ground contacts, a respective power contact 424 inwardly of and next to each pair of signal contacts, and other signal contacts. In this embodiment, all contact are stitched, i.e., inserted into the ceramic part 413 of the body 41 .

The metallic shielding plate 7 is formed by suitable metal injection molding process, such as sintering in metallurgy powder-related processes known as powder metallurgy, in the slot 4131 of the ceramic part 413 of the body 41 . The slot 4131 extends between associated upper pair of high-speed signal contacts 425 and associated lower pair of high-speed signal contacts 425 . The metallic shielding plate 7 has a side protrusion 71 exposed to a corresponding side notch 4121 .

Referring to FIGS. 8-9 and 12 , the shielding shell 5 has a receiving space 50 for the contact module 4 . The shielding shell 5 includes a rear part 51 and a front part 52 . The rear part 51 has plural soldering legs 511 for clamping to a printed circuit board. On an inner side of the rear part 51 there are two stops 512 . On an outer side of the front part 52 there are two positioning portions 521 .

Compared to prior art, use of molded, e.g., sintered, metallic shielding plate in ceramic body part between upper row high-speed signal pair and lower row high-speed signal pair achieves high-frequency and large-current applications without fear of signal interference and melting of materials. Notably, because the shielding plate is molded within the ceramic body as a one-piece structure, it is impossible to disassemble the shielding plate and the ceramic part from each without damages. In other words, the structures of the shielding plate are interengaged with those of the ceramic part to disassemble them from each other. Differently, all prior arts only disclose the preformed metallic shielding plate as an original base for further assembled or molded with the plastic part for forming the terminal module. Notably, in these embodiment, the terminal module is preformed and then assembled into the shielding shell. Anyhow, in other arrangements with different configurations of the terminal module and the shielding shell, the over-mold may be applied upon the ceramic part which is already disposed in the shielding shell so as to have the over-mold also integrally formed with the interior structure of the shielding shell, thus resulting in inherent securement between the over-mold and the shielding shell directly. In this embodiment, the over-mold 114 includes a front crossbar 1141 extending in a transverse direction to press front ends of the contacts for reliably securing the contacts in position upon the ceramic part. The over-mold 114 further includes a middle part 1142 to connect the front crossbar 1141 to the rear main part 1143 which forwardly abuts against the divider 23 of the shielding shell 2 . Notably, the middle part 1142 is aligned with a space between two metallic shielding plate units 1232 , i.e., being offset from the shielding plate units 1232 in the transverse direction.