Electromagnetic interference diminishing structure of a connector assembly

[0001] 1. Field of the Invention

[0002] The present invention is related to an electromagnetic interference diminishing structure of a connector assembly.

[0003] 2. Description of the Prior Art

[0004] The shield metal housing of the plug is formed with grounding sections respectively aligned with corresponding holes of the insulting housing enclosing the shield metal housing. When a front section of the plug is plugged into the socket, the metal housing of the socket and the grounding sections of the shield metal housing of the plug contact with each other through the holes of the insulating housing of the plug. Therefore, the induced electromagnetic wave of the shield metal housing of the plug can be grounded and diminished through the grounding circuit of the circuit board connected with the socket. Accordingly, the electromagnetic interference can be effectively diminished.

[0005] FIGS. 9 to 11 show an existent connector assembly such as P1394b-9pin connector assembly. The connector unit includes a socket 50 and a plug 60. The socket 50 has a main body 51 in which multiple terminals are inlaid. The main body 51 is enclosed by a metal housing 52. The main body 51 and the metal housing 52 define therebetween an insertion cavity 53. The plug 60 includes a shield metal housing 61 in which a terminal main body 62 is inserted. An insulating housing 63 is fitted around the shield metal housing 61. After the terminals in the terminal main body 62 are respectively connected with the leads, the rear section of the insulating housing 63 is wrapped with an insulating layer 64 by way of injection.

[0006] The terminal main body 62 is enclosed by the shield metal housing 61 for reducing the electromagnetic wave generated by the terminals when transmitting signals or shielding the terminals from external electromagnetic interference. Such measure works under low frequency, for example, below 800 MHz. However, the current signal transmission frequency is often up to 1.6 GHz or even over 3.2 GHz. Under such circumstance, the shield metal housing 61 enclosing the terminal main body 62 can simply partially reduce the electromagnetic interference. Moreover, in the case that the transmission frequency is further enhanced, the shield metal housing 61 can hardly diminish the electromagnetic interference.

[0007] It is therefore a primary object of the present invention to provide an electromagnetic interference diminishing structure of a connector assembly. The connector assembly includes a socket and a plug. The socket includes a main body in which multiple terminals are inlaid. The main body is enclosed by a metal housing connected to the grounding circuit of a circuit board. The main body and the metal housing define therebetween an insertion cavity. The plug includes a shield metal housing having a receiving room in which a terminal main body is inserted. An insulating housing is fitted around the shield metal housing, whereby after the terminals in the terminal main body are respectively connected with the leads, a rear section of the insulating housing is wrapped with an insulating layer by way of injection. The shield metal housing of the plug is formed with grounding sections respectively aligned with corresponding holes of the insulting housing. When a front section of the plug is plugged into the insertion cavity of the socket, the metal housing of the socket and the grounding sections of the shield metal housing of the plug contact with each other through the holes of the insulating housing of the plug. Therefore, the induced electromagnetic wave of the shield metal housing of the plug can be grounded and diminished through the grounding circuit of the circuit board connected with the socket. Accordingly, the electromagnetic interference can be effectively diminished.

[0008] It is a further object of the present invention to provide the above electromagnetic interference diminishing structure of the connector assembly, in which the shield metal housing of the plug is formed with multiple grounding sections for contacting with multiple sections of the metal housing of the socket. One end of the grounding section of the shield metal housing of the plug is a free end, whereby the grounding section is a resilient tongue for resiliently abutting against the metal housing of the socket.

[0009] The present invention can be best understood through the following description and accompanying drawings wherein:

[0021] Please refer to FIGS. 1 to 8. The present invention is related to an electromagnetic interference diminishing structure of a connector assembly. The connector assembly includes a socket 20 and a plug 30. The socket 20 has a main body 21 in which multiple terminals 210 are inlaid. The main body 21 is enclosed by a metal housing 22 connected to the grounding circuit of a circuit board 40. The main body 21 and the metal housing 22 define therebetween an insertion cavity 23. The plug 30 includes a shield metal housing 31 having a receiving room 311 in which a terminal main body 32 is inserted. An insulating housing 33 is fitted around the shield metal housing 31. After the terminals 321 in the terminal main body 32 are respectively connected with the leads, the rear section of the insulating housing 33 is wrapped with an insulating layer 34 by way of injection. The shield metal housing 31 of the plug 30 is formed with grounding sections 312a and 312b or 312c aligned with corresponding holes 331 of the insulting housing 33. When the front section of the plug 30 is plugged into the insertion cavity 23 of the socket 20, the metal housing 22 of the socket 20 and the grounding sections 312a and 312b or 312c of the shield metal housing 31 of the plug 30 contact with each other through the holes 331 of the insulating housing 33 of the plug 30. Accordingly, the induced electromagnetic wave of the shield metal housing 31 of the plug 30 can be grounded and diminished through the grounding circuit of the circuit board 40 connected with the socket 20. Therefore, the electromagnetic interference (EMI) can be effectively diminished.

[0022] The electromagnetic interference diminishing structure of the present invention is applicable to an electronic connector assembly such as P1394b-9pin electronic connector assembly or any other equivalent electronic connector.

[0023] Referring to FIGS. 1 to 6, in the electromagnetic interference diminishing structure of the present invention, the metal housing 22 of the socket 20 is formed with perforations 221. A resilient contact tongue 222 integrally extends from a sidewall of each perforation 221 into the perforation 221. A rear section of each resilient contact tongue 222 is biased toward the main body 21 enclosed by the metal housing 22. In addition, the rear end of the resilient contact tongue 222 is bent to form a V-shaped bending section 222a. The V-shaped bending section 222a correspondingly extends into the hole 331 of the insulating housing 33 of the plug 30 to resiliently tightly abut against the grounding section 312a of the shield metal housing 31.

[0024] In the electromagnetic interference diminishing structure of the present invention, the shield metal housing 31 of the plug 30 can be composed of a first casing 31a and a second casing 31b mated with each other. Alternatively, the shield metal housing 31 can be made from one piece of metal board by integral punching. This is not limited in the present invention.

[0025] Referring to FIGS. 1, 4 and 5, at least one sidewall of the front section of the shield metal housing 31 of the plug 30 is outward punched to form a boss section defined as a grounding section 312a. The grounding section 312a is aligned with the hole 331 of the insulating housing 33 or extends into the hole 331.

[0026] Referring to FIGS. 1, 4 and 6, one end of the grounding section 312b of the shield metal housing 31 of the plug 30 is a free end, whereby the grounding section 312b is a resilient tongue for resiliently abutting against the metal housing 22 of the socket 20.

[0027] As shown in FIGS. 1 and 2, the grounding sections 312a, 312b of the shield metal housing 31 of the plug 30 are respectively a fixed grounding section 312a as a rectangular boss and a resilient tongue 312b. Alternatively, as shown in FIGS. 7 and 8, the grounding section 312c of the shield metal housing 31 of the plug 30 is a domed boss. The shape and pattern of the grounding sections 312a, 312b, 312c are not limited.

[0028] At least one grounding section 312a, 312b, 312c is formed on the shield metal housing 31 of the plug 30. The grounding sections 312a, 312b, 312c are respectively aligned with the holes 331 of the insulating housing 33 around the shield metal housing 31 or outward extend through the holes 331 of the insulating housing 33. When the plug 30 is plugged into the socket 20, the grounding section 312a protruding from the insulating housing 33 will contact with the metal housing 22 of the socket 20. Also, the resilient tongue 222 of the socket 20 will contact with the grounding section 312b of the shield metal housing 31 through the corresponding hole 331 of the insulating housing 33. Accordingly, the shield metal housing 31 of the plug 30 can connect with the grounding circuit connected with the socket 20. Therefore, the induced electromagnetic wave of the shield metal housing 31 of the plug 30 can be grounded and diminished through the grounding circuit of the circuit board 40 connected with the socket 20. Therefore, the electromagnetic interference (EMI) can be effectively diminished to stabilize the transmission of electronic signal of the connector assembly.

[0029] The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiments can be made without departing from the spirit of the present invention.