Sealed receptacle connector for PC card

Abstract: Disclosed is an improved receptacle connector for an IC card, which includes a housing (1) having terminal-receiving cavities (4) with terminals (2) mounted therein. Each terminal is fixed to a stopper (3) and the terminal-and-stopper assembly is press-fit within the housing to provide a seal which prevents the ingress of foreign particles into the IC card to avoid contamination of and damage to the circuitry of the internal circuit board of the IC card in which the receptacle connector is assembled.

Description: Field of the Invention The present invention relates to an electrical connector, and more particularly, to a receptacle connector for an IC card. Background of the Invention Figure 15 shows a conventional receptacle connector in an assembled IC card 54. As shown in the drawing, receptacle terminals 52 are press-fit in terminal-receiving cavities 53 of a housing 51. Although cover members 58 seal and protect the internal circuit board 56 of the IC card from contaminants and other foreign substances, some moisture and other small size foreign substances may enter the IC card 54 via the cavities 53, as indicated by arrows 55. Therefore there is a potential for contamination of or damage to the integrated circuitry 57 on the surface of internal circuit board 56 of the IC card. The portable nature of IC cards and the removal of the cards from relatively clean areas such as offices further increases the likelihood of the ingress of foreign substances into the IC card. In an attempt to solve the problem of contamination, it is proposed that housing 51 and terminals 52 are integrally or unitarily formed, such as in a single overmolding process to eliminate cavities 53. The receptacle connector would then be sealed to the environment except for the smaller inlet apertures 61 at the front mating edge thereof, which receive the contact pins of a mating connector (not shown). This type of solution however is complicated and costly in terms of design, manufacturing and ultimate cost of the connector. Summary of the Invention An object of the present invention is to provide a sealed receptacle connector for an IC card, which receptacle connector prevents the ingress of foreign contaminants into the IC card, and which does not add significantly to the cost of manufacturing and assembling such receptacle connectors. To achieve this object, a receptacle connector is provided, which includes an insulative housing, a plurality of inlet apertures at a first end of the housing for receiving contacts of a mating connector, the inlet apertures communicating with terminal-receiving cavities extending rearwardly therefrom, and a corresponding plurality of receptacle terminals inserted in the cavities. Each of the plurality of receptacle terminals is connected to an insulative stopper, and each stopper is adapted to be press-fit within the housing at a second end thereof, whereby, when the terminals and stoppers are inserted in the terminal-receiving cavities, the cavities are sealed from the environment by the stoppers. Brief Description of the Drawings Other objects and advantages of the present invention will be understood from the following description of the receptacle connector according to preferred embodiments of the present invention, which are shown in accompanying drawings: Figure 1 is a plan view of a receptacle connector according to a first embodiment of the present invention, partly in section; Figure 2 is a side view of the receptacle connector of the first embodiment, partly in section; Figure 3 is a plan view of terminals connected to a carrier strip; Figure 4 is a side view of one of the terminals; Figure 5 is a plan view showing, partly in section, how the terminal-and-stopper assembly is inserted into a housing; Figure 6 is a side view showing, partly in section, how the terminal-and-stopper assembly is inserted in the housing; Figure 7 is a plan view showing, partly in section, the housing with the terminal-and-stopper assembly inserted therein; Figure 8 is a side view showing, partly in section, the housing with the terminal-and-stopper assembly inserted therein; Figure 9 is a plan view of a receptacle connector according to a second embodiment of the present invention, showing, partly in section, how the terminal-and-stopper assembly is inserted into the housing; Figure 10 is a side view of the receptacle connector of the second embodiment, showing, partly in section, how the terminal-and-stopper assembly is inserted into the housing; Figure 11 is a plan view showing, partly in section, the housing having the terminal-and-stopper assembly press-fit there within; Figure 12 is a side view showing, partly in section, the housing having the terminal-and-stopper assembly press-fit therein; Figure 13 shows how the terminals and associated stoppers are integrally connected within a receptacle connector according to a third embodiment of the invention; Figure 14 shows how the terminal-and-stopper assembly is attached to the housing in the receptacle connector of the third embodiment; and Figure 15 is a longitudinal section of a conventional receptacle connector. Detailed Description of the Preferred Embodiments Referring first to Figures 1 through 8, a receptacle-type electrical connector according to a first embodiment is described. As shown in Figures 1 and 2, the receptacle connector comprises an elongated insulative housing 1, a plurality of receptacle terminals 2 and a corresponding plurality of stoppers 3. The housing 1 is composed of an upper and a lower row of terminal-receiving cavities 4. The terminals 2a are inserted in the upper and lower terminal-receiving cavities 4 of the housing 1 and are adapted to be connected to electronic circuitry (not shown) formed on opposite surfaces of a circuit board 5 of an IC card, thereby permitting the circuitry of the circuit board to be connected to mating contact pins (not shown) when the contact pins are received through inlet apertures 6 of housing 1. The receptacle connector is adapted to be fixed to one end of the circuit board, as shown in Figure 2. As best seen in Figure 2, the terminal-receiving cavities 4 are sealed at their ends by stoppers 3, thereby preventing the ingress of foreign substances into the IC card through the inlet apertures and the terminal-receiving cavities, and preventing contamination of the internal circuitry of the circuit board. Looking now to Figures 3 and 4, the terminals are shown prior to assembly of the receptacle connector. The terminals 2 are arranged at a given spacing and connected by a carrier strip 7. Each terminal includes a terminal contact 2a at an end opposite the carrier strip, and a conductor extension 2b which extends between the terminal contact 2a and the carrier strip 7. Guide pieces 8 are arranged between adjacent conductor extensions 2b, and also extend from carrier strip 7. During assembly of the receptacle connector, guide pieces 8 are cut and removed from carrier strip 7, and the terminal contacts 2a are arranged at predetermined spacing, for example at intervals of 1.0 mm. The terminals are then insert-molded with the stoppers to form a unitary terminal-and-stopper assembly. The terminal-and-stopper assembly is then press-fit into housing 1 from the rear end thereof by inserting terminal contacts 2a into terminal-receiving cavities 4 so that the stoppers are press-fit within a recess or opening 11 of housing 1, as shown in Figures 5 and 6. The fully assembled receptacle is shown in Figures 7 and 8. As seen from these drawings, and in particular Figure 8, the cavities 4 of housing 1 are completely sealed by the stopper 3, which otherwise would permit foreign contaminants into the IC card by way of the terminal-receiving cavities and expose the circuitry of the printed circuit board thereto. After press-fitting the terminal-and-stopper assembly into the housing, the carrier strip 7 is then cut and removed from the conductive extensions 2b, and then, as shown in Figure 2, the free ends of the conductive extensions 2b are formed divergently to facilitate the insertion of the circuit board 5 between the rows of terminals 2 and the soldering of the free ends of the extensions 2b to the surface of the circuit board. Referring now to Figures 9 through 12, a receptacle connector is described according to a second embodiment of the invention. In the first embodiment, terminals 2 and associated stoppers 3 are insert-molded to form a single terminal-and-stopper assembly. In the second embodiment, the terminals 2 are simply press-fit within an associated stopper member 3 to provide the unitary terminal-and-stopper assembly. As in the first embodiment, the terminal-and-stopper assembly is then press-fit into housing 1 from the rear end thereof, as indicated by arrow 20 in Figure 10, until stopper 3 is positively fixed or press-fit into recess 11 of housing 1, to provide the receptacle assembly as shown in Figures 11 and 12. Next, and now referring to Figures 13 and 14, a receptacle connector is described according to a third embodiment of the invention. In the first and second embodiments, the receptacle connector is adapted to be fixed to the end of the circuit board 5 (Fig. 2), but in the third embodiment the receptacle is fixed to the surface of a circuit board 5 (Fig. 14(c)). As shown in Figure 13, terminals 2 and associated stopper 3 are integrally connected by either method described above, and then, as shown in Figures 14a and 14b, the terminal-and-stopper assembly is assembled within housing 1. The receptacle is then adapted to be fixed to the surface of the circuit board 5 of an IC card as shown in Figure 14c. Mating contact pins are adapted to be inserted into the receptacle in a direction transverse to the surface of circuit board 5. As understood from the above, a receptacle connector according to the present invention includes a housing whose terminal-receiving cavities are each sealed by a stopper to prevent the ingress of foreign particles therethrough and to avoid the potential contamination of and/or damage to the circuitry of the internal circuit board of an IC card in which the receptacle connector is assembled.

Claims: A receptacle connector for an IC card comprising: an elongated housing (1) having a plurality of terminal-receiving cavities (4) extending therethrough, and a plurality of inlet openings (6) formed at a first end of the housing and communicating with the terminal-receiving cavities for receiving contact pins of a mating connector, a plurality of terminals (2) within the terminal-receiving cavities (4) for electrically connecting to the contact pins of the mating connector, a plurality of stoppers (3) each attached to a corresponding one of the plurality of terminals (2) wherein each stopper is press-fit within the housing at a second end thereof, whereby each terminal-receiving cavity is sealed by one of the stoppers to prevent the ingress of foreign particles therethrough. A receptacle connector as set forth in claim 1 wherein the terminal-receiving cavities of the elongated housing and the terminals therein are arranged in two rows. A receptacle connector as set forth in claim 1 wherein the plurality of stoppers are formed in a unitary member which fits within a recess (11) in the elongated housing. A receptacle connector as set forth in claim 1 wherein the terminals are press-fit into the stoppers to form a single terminal-and-stopper assembly and the stoppers retain the terminals in their proper position within the housing. A receptacle connector as set forth in claim 2 wherein the two rows of terminals are defined by an upper row of terminals and a lower row of terminals which are adapted to straddle a printed circuit board (5) of the IC card. A receptacle connector as set forth in claim 1 wherein each terminal includes a terminal contact (2a) at one end thereof and a conductor extension (26) which extends from the terminal contact, wherein the respective stopper is located along the conductor extension (26) proximate the joint between the terminal contact and the conductor extension. A method of fabricating a receptacle connector for an IC card, the receptacle connector including an elongated housing (1) having a plurality of terminal-receiving cavities (4) extending therethrough, a plurality of terminals (2) in the form of a terminal strip and adapted for positioning within the terminal-receiving cavities (4), and a plurality of stoppers (3) each corresponding to one of the plurality of terminals and adapted to be press-fit within the housing, the method comprising the steps of: a) overmolding the strip of terminals to the stoppers to provide a unitary terminal-and-stopper assembly; b) inserting the terminal-and-stopper assembly into the housing so that each of the plurality of terminals is positioned within a corresponding terminal-receiving cavity; and c) fixing the stoppers within a recess in the housing wherein the terminals are properly positioned within the housing to receive the mating pins of a mating connector and wherein the terminal-receiving cavities are each sealed at one end by a corresponding stopper to prevent the ingress of foreign substances therethrough.

Inventors: KATSUNORI KASAHARA, KATSUNORI, KASAHARA
Applicants: MOLEX INC, MOLEX INCORPORATED
Application year: 1995
Main classification: H01R13
IPC codes: H01R43, H01R12, H01R13