Electrical connector

Abstract: An electrical connector includes an insulating housing (30) having an annular recess (34) extending rearwardly from a front end thereof and a shield member (10) having a cylindrical wall fitted into the annular recess, a plurality of contact lugs (11) extending outwardly in radial directions from a front edge thereof, and a leg member (14) for connection with a shield circuit of a printed circuit board. The shield member has a plurality of first cantilever contacts (13) bent outwardly and then inwardly forming an outward projection for contact with a metal shield provided on an inside of a mating shell member (50) and a plurality of second cantilever contacts (12) bent inwardly and then outwardly forming an inward projection for contact with a metal shield (52) provided on an outside of the mating shell member.

Description: The present invention relates to shielded electrical connectors as mentioned in the preamble of claim 1. Japanese U.M. Patent Application Kokai No. 61-184,285 discloses an electrical connector which includes an insulating housing having an annular recess extending rearwardly from the front end for receiving the shell member of a mating connector. A shield member fitted in the annular recess has cantilever contact members with a spring free end for contact with a metal shield provided on the inside of the mating shell member and a leg member extending through the rear slit of the insulating housing for attachment to a printed circuit board. With the above electrical connector, however, it is impossible to make a shield connection when the metal shield is provided on the outside of a mating shell member. In addition, the metal from which the cantilever contacts and the shield member are formed is so thin that the contacts are liable to deformation upon plugging in or out of the mating connector. Moreover, the materials of the insulating housing and the shield member are so weak that the mating end of the insulating housing and the front end of the shild member are liable to damage upon plugging in or by an impact applied from the outside. Accordingly, it is an object of the present invention to provide an electrical connector which is able to make a shield connection with a mating connector no matter whether the metal shield is provided on the inside or outside of the mating shell member. It is another object of the invention to provide an electrical connector having contact members which are free of deformation by an excess load which can be applied upon plugging in or out. The known EP-A-0 118 168 comprising an electrical connector with an insulating housing having an annular recess extending rearwardly from a front end thereof. A shield member has a cylindrical wall fitted into the annular recess, and a plurality of contact lugs extending outwardly in radial directions from a front edge thereof whereby the shield member has a plurality of cantilever contacts bent inwardly and then outwardly forming an inward projection for contact with a metal shield provided on an outside of a mating sell member. According to the invention, the above object is achieved with the features of claim 1. Preferred embodiments of the invention are mentioned in the sublaims. It is advantageous to provide a plurality of cantilever contacts on either side of the shield member having a spring free end for contact with the metal shield provided on the shell member of a mating connector. The cantilever contacts on either side are able to make the shield contact with the metal shield which is provided on either the inside or outside of a mating shell member. The free end bent away from the mating shell member permits easy insertion of the mating shell member. The central opening of the end face protection member restricts radial movement of the mating shell member so that cantilever contacts are protected from deformation by excessive load which can be applied upon plugging in or out of the mating connector. Other advantages of the invention will be apparent from the following description when taken in conjunction with the accompanying drawings. FIG. 1 is an partially cutaway, exploded perspective view of an electrical connector according to an embodiment of the invention; FIG. 2 is a perspective view of a shield member useful for the electrical connector of FIG. 1; FIG. 3 is a partially cutaway, exploded perspective view of an electrical connector according to another embodiment of the invention; FIG. 4 is a perspective view of a metal hood useful for the electrical connector of FIG. 3; and FIG. 5 is a perspective view of a shield member useful for the electrical connector of FIG. 3. In FIG 1, an electrical connector includes a shield member 10 (FIG. 2), an end face protection member 20, an insulating housing 30, and contacts 40. As best shown in FIG. 2, the shield member 10 is made by stamping and forming a spring metal thin sheet in the form of a cylinder. A plurality of contact lugs 11 extending outwardly in radial directions from the front edge of the shield member 10 for engagement with radial grooves 36 which are provided on the front surface 35 of a front section 32 of the insulating housing 30. A plurality of cantilever contacts 12 are provided on the circumferential surface for contact with the metal shield of a mating connector. This cantilever contact is made by punching out substantially C-shaped pieces and bending inwardly and then outwardly. A plurality of cantilever contacts 13 are bent by slightly more than 180 degrees so that it extends first slightly outwardly and then inwardly for engagement with the insulating housing with the tip and the metal shield of a mating connector with the inwardly projected portion. A leg member 14 extends downwardly for connection to a grounding circuit (not shown). As best shown in FIG. 1, the end face protection member 20 is made by stamping and forming a relatively thick metal sheet. It has a central opening 31 with a diameter substantially equal to the shell member 50 of a mating connector for receiving it and a substantially hexagonal shape which is substantially identical with the front end of the insulting housing 30. Two pairs of lance members 22 extend downwardly from opposite two sides of the end face protection member 20 for insertion into latch slots 37. These lance members are made so that the end face protection member 20 is detachable from the insulating housing by means of a simple extracting tool. A pair of through holes 23 are provided for receiving attaching bolts (not shown). The insulating housing 30 is molded from a dielectric plastic so as to have a cylindrical body 31, a hexagonal front section 32, and a cylindrical contact support section 33 which extends upwardly from the cylindrical body 31 so as to define an annular recess 34 in which the shield member 10 and the mating shell member 50 are fitted. A plurality of radial grooves 36 are provided on the front surface of the front section 32 corresponding to the contact lugs 11. A plurality of latch slots 37 are provided on the front section 32 for engagement with latch lances 22. A pair of through holes 37' are provided for receiving attaching bolts. A plurality of contact holes 38 are provided on the contact support section 33 to support contacts. A plurality of latch channels 39 are provided on the circumferential surface of the contact support section 33 for engagement with the tips of the latch contacts 13. The contact 40 has a contact portion (not shown) for contact with the contact of a mating connector within the insulating housing and a connection portion 41 which projects from the bottom of the insulating housing for connection to the electrical circuit of a printed circuit board (not shown). The shield member 10 and the end face protection member 20 are assembled into the insulating housing 30 as follows. (1) The shield member 10 as shown in FIG. 2 is inserted into the annular recess 34 of the insulating housing 30 so that the latch contacts 13 and the contact lugs 11 fit in the latch channels 39 and the radial grooves 36 respectively. Preferably, each lug 11 has a spring tip projecting beyond the front surface 35 for better electrical connection to the backside of the protection member 20. (2) The end face protection member 20 is then mounted on the front end 35 such that the latch lances 22 fit into the latch slots 37 for integration by latching. Consequently, the backside of the protection member 20 comes into electrical contact with the contact lugs 11. Thus, the electrical connector is shielded in part of the front and the entire side. In addition, when a mating connector is plugged in, the end face protection member comes into contact with the finger so that the static electricity is discharged, thus preventing the circuitry from malfunctioning. (3) When the shell member 50 of a mating connector is plugged in the electrical connector, the shell member 50 is guided by the central opening 21 of the tick protection member 20 so that no excessive forces are applied to the cantilever contacts 12 and the cantilever latch contacts 13, thus preventing inadvertent damage thereto. Hence, when a metal shield 52 is provided on the outside of the shell member 50, the metal shield 52 contacts the cantilever contacts 12 while when it is provided on the inside of the shell member 50, the metal shield 52 contacts the cantilever latch contacts 13. With the shield member 10 and the end face protection member 20 thus constructed, not only it is possible to always make an electrical connection between these members but also it is easy to replace the protection member 20 on the front end 35 of the insulating housing 30 according to the type of application. Alternatively, the shield member, which is stamped and formed from a metal sheet, may be made by assembling two or more shield sections to form a cylindrical shield member. With the electrical connector according to the invention, it is possible to make shield connection even if the metal shield of a mating connector is provided on the inside or outside of the shell member. In addition, the end face protection member make it possible to minimize the gap between the end face protection member and the shell member of a mating connector. Moreover, since the mating end of the insulating housing and front end of the shield member are completely protected, there is no or little danger that the contacts are deformed or the mating end of the insulating housing and the front end of the shield member are damaged upon plugging in or out of a mating connector.

Claims: An electrical connector comprising an insulation housing (30) having an annular recess (34) extending rearwardly from a front end (35) thereof; and a shield member (10) having a cylindrical wall fitted into said annular recess (34), a plurality of contact lugs (11) extending outwardly in radial directions from a front edge thereof, and a leg member (14) for connection with a shield circuit of a printed circuit board, characterized in that said shield member (10) having a plurality of first cantilever contacts (13) bent outwardly and then inwardly forming an outward projection for contact with a metal (52) shield provided on an inside of a mating shell member (50) and a plurality of second cantilever contacts (12) bent inwardly and then outwardly forming an inward projection for contact with a metal shield (52) provided on an outside of said mating shell member (50). The electrical connector of claim 1, which further comprises an end face protection member (20) which is made from a metal sheet thicker than that of said shield member (10) to cover said front end of said insulating housing (30) coming into contact with said contact lugs (11) to shield front and side portions of said electrical connector and has a central opening (21) for guiding said mating shell member (50) upon plugging in or out. The electrical connector of claim 2, wherein said end face protection member (20) has a plurality of latch lances (22) for engagement with latch slots (37) provided on a front portion (32) of said insulating housing (30) to make said end face protection member (20) detachable by means of a simple extracting tool. The electrical connector of one of the above mentioned claims, wherein said plurality of cantilever contacts (12,13) on either side of said shield member (10) having a spring free end for contact with said metal shield (52) provided on said shell member (50) of a mating connector.

Inventors: KAWAI MITSURU, SASAKI YOSHIHIRO, YOSHIDA MASARU, KAWAI, MITSURU, SASAKI, YOSHIHIRO, YOSHIDA, MASARU
Applicants: HIROSE ELECTRIC CO LTD, HIROSE ELECTRIC CO., LTD.
Application year: 1989
Main classification: H01R13
IPC codes: H01R13