BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a connector, and more particularly to a connector having a metal shell shielding an insulative housing.
2. Description of Related Art
At present, Universal Serial BUS (USB) is a widely used as an input/output interface adapted for many electronic devices, such as personal computer and related peripherals. A conventional USB plug connector usually comprises an insulative housing defining a base portion and a tongue portion extending forwardly from the base portion; a plurality of first contacts coupled to the insulative housing to form as a first unit module and having first contacting portions retained in the tongue portion; an insulator assembled to the insulative housing; a plurality of second contacts coupled to the insulator to form as a second unit and having second contacting portions extending upon the tongue portion; and a metal shell shielding the insulative housing and defining an interface with the tongue portion extending therein, typically, such as the connector disclosed in U.S. Pat. No. 7,618,293 issued on Nov. 17, 2009.
The base portion has a pair of protrusions formed at two lateral sides thereof for interferingly engaging with the metal shell so that the metal shell could be retained on the insulative housing reliably. However, when the metal shell is assembled to the insulative housing, the metal shell will scrape the protrusions, and in case of such scraping, the protrusions will be abraded easily and rending unwanted defects.
Hence, an improved connector with an improved housing is desired to overcome the above problems.
BRIEF SUMMARY OF THE INVENTION
According to one aspect of the present invention, a connector comprises: an insulative housing having a base portion and a tongue potion extending forwardly from the base portion, the base portion defining a retaining slot and a pair of side walls located at two lateral sides of the retaining slot, each side wall has at least a protrusion protruding outwardly from an outer face thereof; a plurality of contacts attached to the insulative housing; an insulator retained in the retaining slot and defining a pair of side surfaces facing inner faces of the side wall; at least one clearance being formed between the adjacent side surface and inner face and corresponding to the respective protrusion in a transverse direction; and a metal shell assembled to the insulative housing and covering the insulative housing and the insulator. The metal shell defines a top plate, a bottom plate opposite to the top plate, and a pair of side plates connecting the top and bottom plates and passing over the protrusions in a front-to-back direction perpendicular to the transverse direction when the metal shell is assembled to the insulative housing.
According to another aspect of the present invention, a connector comprises: a first unit module comprising an insulative housing and a plurality of first contacts coupled to the insulative housing; the insulative housing having a base portion and a tongue potion extending forwardly from the base portion, the base portion defining a pair of side walls spaced from each other along a transverse direction, the side walls have protrusions protruding outwardly from outer faces thereof; the first contacts having stiff first contacting portions retained in the tongue portion and first tail portions extending out of the base portion; a second unit module comprising an insulator and a plurality of second contacts coupled to the insulator; the insulator being sandwiched between the side walls in the transverse direction; the second contacts having resilient second contacting portions extending upon the tongue portion and located behind the first contacting portions and second tail portions extending out of the base portion; a metal shell assembled to the insulative housing and shrouding the first and second unit modules, the metal shell defining a pair of side plates shrouding the side walls and passing over the protrusions in a front-to-back direction perpendicular to the transverse direction when the metal shell being assembled to the insulative housing; and a pair of upheavals being located between the insulator and the side walls, and forming clearances located between the insulator and the side walls and aligned with the corresponding protrusions in the transverse direction so as to make the side walls deflectable at the clearances when side plates of the metal shell passing over the corresponding protrusions.
The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter which form the subject of the claims of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
For a more complete understanding of the present invention, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
FIG. 1 is an assembled, perspective view of a connector according to an embodiment of the present invention;
FIG. 2 is similar to FIG. 1, but viewed from another aspect;
FIG. 3 is a partially exploded view of the connector shown in FIG. 1;
FIG. 4 is a perspective view of the connector with a metal shell removed therefrom;
FIG. 5 is an enlarged view of a circle portion in FIG. 4;
FIG. 6 is an exploded view of the connector shown in FIG. 1;
FIG. 7 is similar to FIG. 6, but viewed from another aspect.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be obvious to those skilled in the art that the present invention may be practiced without such specific details.
Referring to FIGS. 1-3, a connector 100 according to an embodiment of the present invention is an A type USB 3.0 plug connector and defines an interface 101. The connector 100 comprises an insulative housing 1, a set of contacts 3 coupled to the insulative housing 1, an insulator 2 coupled to the insulative housing 1, and a metal shell 4 shielding the insulative housing 1 and the insulator 2.
Referring to FIGS. 3-7, The insulative housing 1 includes a base portion 11 and a tongue portion 12 extending forwardly from a front end of the base portion 11. The base portion 11 has a first portion 111 defining a retaining slot 1110 for receiving the insulator 2 and a pair of side walls 113 located at two lateral sides of the retaining slot 1110, and a second portion 112 extending backwardly from the first portion 111. The first portion 111 and the second portion 112 form as a ladder shape which can be presented explicitly in FIG. 7.
Referring to FIGS. 3-6, each side wall 113 has a first and second protrusions 1131, 1132 protruding outwardly from an outer face thereof, and a recess 1135 depressed from an inner face thereof and communicating with the retaining slot 1110. The recess 1135 locates between the first and second protrusions 1131, 1132 in a front-to-back direction. The first portion 111 has a first opening 1112 passing therethrough in a height direction of the insulative housing 1 and communicating with the retaining slot 1110, a vertical face 1120 facing the retaining slot 1110, and a pair of embossments 1113 protruding into the retaining slot 1110 and located between the first opening 1112 and the vertical face 1120. The second portion 112 has a horizontal upper face 1121 perpendicular to the vertical face 1120, a plurality of ribs 1122 protruding upwardly from the upper face 1121, and a plurality of cavities 1123 exposed to exterior and formed between each two adjacent ribs 1122.
The second portion 112 has a pair of first bumps 1124 protruding upwardly and outwardly therefrom, and a second bump 1125 protruding upwardly from the upper face 1121 and located between the first bumps 1124 in a transverse direction perpendicular to the front-to-back direction. The second bump 1125 is higher than the first bumps 1124 and has a pair of securing slots 11252 formed at two lateral sides thereof for retaining the metal shell 4.
Referring to FIGS. 4-7, the insulator 2 is received in the retaining slot 1110 and has a pair of upheavals 231 protruding outwardly from two side surfaces 23 thereof. Each upheaval 231 includes a horizontal portion 2311 extending along the front-to-back direction and resisting the inner face of the side wall 113, a vertical portion 2312 extending along the height direction and received in the corresponding recess 1135, and a flange 233 protruding outwardly from the horizontal and vertical portions 2311, 2312 and being locked into a slit 1130 formed in the recess 1135. Therefore, the insulator 2 could be retained in the insulative housing 1 reliably. The insulator 2 has a front depression 234 located at front of the vertical portion 2312 and above the horizontal portion 2211, and a rear depression 235 located at back of the vertical portion 2312 and above the horizontal portion 2211. When the insulator 2 is assembled to the retaining slot 1110, the front and rear depressions 234, 235 are corresponding to the first and second protrusions 1131, 1132 in the transverse direction, therefore, front and rear clearances are defined between the side surface 23 of the insulator 2 and the inner face of the side wall 113 corresponding to the first and second protrusions 1131, 1132 in the transverse direction. When the metal shell 4 is assembled to the insulative housing 1, the side wall 113 will have an elastic deformation at the front and rear clearances, therefore, the metal shell 4 could pass over the first and second protrusions 1131, 1132 smoothly so as to prevent the first and second protrusions 1131, 1132 from abrasion. In other embodiments, the front and rear depressions 234, 235 could be formed on the inner faces of the side walls 113. The tongue portion 12 has a number of projections 122 spaced from each other in the transverse direction and forms a number of passageways 123 between each two adjacent projections 122. The insulator 2 is retained between the embossments 1113 and the projections 122 in the front-to-back direction.
Referring to FIGS. 6-7, the contacts 3 are adapted for USB 3.0 protocol, and include a number of first contacts 31 and a number of second contacts 32. The first contacts 31 are adapted for USB 2.0 protocol and connected by two first contact carriers 310 before the first contacts 31 being made out. The first contacts 31 are insert molded into the insulative housing 1. The two first contact carriers 310 will be cut off from the first opening 1112 and a second opening 125 passing through the tongue portion 12 in the height direction so that the first contacts 31 could be separated from each other. The first contacts 31 include stiff first contacting portions 312 retained in the tongue portion 12 and exposed to the interface 101, first connecting portions 311 bending downwardly and extending backwardly from back ends of the first contacting portions 312, first bending portions 314 bending upwardly from back ends of the first connecting portions 311, first offset portions 313 extending backwardly from the first connecting portions 311 and offsetting horizontally, and first tail portions 315 connecting the first offsetting portions 313 and extending backwardly beyond the second portion 112. The two first contact carriers 310 connect the first contacts 31 at the first contacting portions 312 and the first connecting portions 311. The second contacts 32 are connected by a second contact carrier 320 before the second contacts 32 being made out and include resilient second contacting portions 322 received in the passageways 123 of the tongue portion 12, second connecting portions 321 extending backwardly from back ends the second contacting portions 322 and retained in retaining holes 24 passing through the insulator 2 in the front-to-back direction, second bending portions 324 bending upwardly from the second connecting portions 321 and extending through a space formed between the vertical face 1120 and the insulator 2, second offset portions 323 extending backwardly and offsetting horizontally, and second tail portions 325 connecting the second offset portions 323 and extending backwardly beyond the second portion 112. The second offset portions 323 are retained in the cavities 1123 of the second portion 112. The second contact carrier 320 connect the second contact 32 at the second offset portions 323 and is located upon the upper face 1121. In this embodiment, the second contacts 32 are assembled to the insulator 2 so as to form a module retained in the insulative housing 1, In other embodiments, the second contacts 32 could be insert molded into the insulator 2 to form a module retained in the insulative housing 1.
Conjoined with FIG. 7, the first contacts 31 include a first grounding contact 51, a power contact 56, and a first pair of differential contacts 53 located between the first grounding contact 51 and the power contact 56. The first offset portions 313 of the first grounding contact 51 and the power contact 56 offset oppositely along the transverse direction, therefore, a distance measured between the first tail portions 315 of the first grounding contact 51 and the power contact 56 is greater than a distance measured between the corresponding first contacting portions 312 or the corresponding first connecting portions 311. The first offset portions 313 of the first pair of differential contacts 53 offset toward each other in the transverse direction, therefore, a distance measured between the first tail portions 315 of the first pair of differential contacts 53 is smaller than a distance measured between the corresponding first contacting portions 312 or the corresponding first connecting portions 311.
The second contacts 22 include a second pair of differential contacts 54, a third pair of differential contacts 55, and a second grounding contact 52 located between the second and third pairs of differential contacts 54, 55. The second offset portions 323 of the second pair of differential contacts 54 offset toward each other in the transverse direction, therefore, a distance measured between the second tail portions 325 of the second pair of differential contacts 54 is smaller than a distance measured between the corresponding second contacting portions 322 or the corresponding second connecting portions 321. Similarly, the second offset portions 323 of the third pair of differential contacts 55 offset toward each other in the transverse direction, therefore, a distance measured between the second tail portions 325 of the second pair of differential contacts 54 is smaller than a distance measured between the corresponding second contacting portions 322 or the corresponding second connecting portions 321. The second bending portion 324 of the second grounding contact 52 has a width wider than those of the remaining second bending portions 324 and defines a through hole 3241 passing therethrough in the front-to-back direction. The second offset portion 323 of the second grounding contact 52 has a width wider than that of the second bending portion 324 and defines two split said second tail portions 325 spaced from each other in the transverse direction. The second bump 1125 is located between the two second tail portions 325 of the second grounding contact 52.
The first and second tail portions 315, 325 are arranged in one row, all of the second tail portions 325 are arranged between the first tail portions 315 of the first grounding contact 51 and the power contact 56. In another word, relative to the first and second tail portions 315, 325, the first grounding contact 51 and the power contact 56 are arranged at two outermost sides. The second tail portions 325 of the second pair of differential contacts 54 are arranged between the first tail portion 315 of the power contact 56 and one second tail portion 325 of the second grounding contact 52, the second tail portions 325 of the third pair of differential contacts 55 are arranged between the first tail portion 315 of the first grounding contact 51 and the other second tail portion of the second grounding contact 52. Referring to FIG. 3, all of the first and second tail portions 315,325 viewed from a back view and a left-to-right direction are arranged in the following specific sequence: power contact 56 (P){grave over ( )} the second pair of differential contacts 54 (S+, S−){grave over ( )} the second grounding contact 53 (G){grave over ( )} the first pair of differential contacts 52 (S−, S+){grave over ( )} the second grounding contacts 53 (G){grave over ( )} the third pair of differential contacts 55 (S+, S−){grave over ( )} the first grounding contact 51 (G). Therefore, in the first and second tail portions 315,325, each adjacent two pairs of the first, second and third pairs of differential contacts 53, 54, 55 has a grounding contact 52 located therebetween, the space between the first, second and third differential contacts 53, 54, 55 can be increased, the interference between the first, second and third differential contacts 53, 54, 55 can be reduced more effectively.
Referring to FIGS. 1-4, the metal shell 4 surrounds the tongue plate 12 to form the interface 101 and includes a top plate 41, a bottom plate 42 and a pair of side plates 43 connecting the top and bottom plates 41, 42. The metal shell 4 has a pair of first notches 44 formed between the top plate 12 and two side plates 43 and engaging with the corresponding first bumps 1124, a second notch 45 formed in a back side of the top plate 41 and engaging with the second bump 1125. The first bumps 1124 are received in the corresponding first notches 44 and resist the metal shell 4 forwardly, inwardly and downwardly. The second bump 1125 is received in the second notch 45. The top plate 41 has two securing portions 451 on two sides of the second notch 45 retained in the securing slots 11252 so that the top plate 41 could be orientated in the second bump 1125 in the height direction. Therefore, the second portion 112 has two sides resisted upwardly and outwardly by the metal shell 4 via the first bumps 1124 cooperating with the first notches 44, and a midst portion orientated along the height direction by the metal shell 4 via the second bump 1125 cooperating with the second notch 45, the second portion 112 could be presented from warp along the height direction, and the first and second tail portions 315, 325 will be preferably coplanar in a horizontal plane for being soldered to a printed circuit board reliably. In another embodiment, the second bump 1125 could have only one said securing slot 11252 formed thereon, the top plate 41 has one said securing portion 451 extending backwardly from a rear end thereof and being retained in said securing slot 11252. When the metal shell 4 is assembled to the insulative housing 1 along the front-to-back direction, the side wall 113 will have an elastic deformation at the front and rear depressions 234, 235, therefore, the side plates 43 of the metal shell 4 could pass over the first and second protrusions 1131, 1132 smoothly, and the first and second protrusions 1131, 1132 could be prevented from abrasion.
It is to be understood, however, that even though numerous, characteristics and advantages of the present invention have been set fourth in the foregoing description, together with details of the structure and function of the invention, the disclosed is illustrative only, and changes may be made in detail, especially in matters of number, shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Patent Application
20120009818
