Electrical connector and method of making same

Abstract: The terminals (21, 22) are supported by the housing (11) at the middle sections (21C, 22C). Each of the terminals (21, 22) has a contact section (21A, 22A) bent into the receiving cavity (12) of the housing (11) after integral molding with the housing (11).

Description: The present invention relation to an electrical connector and a method of making the same. A receptacle connector having a rectangular housing with a receiving cavity for receiving a mating plug connector so that the diagonally extending contact section is brought into spring contact with the terminal of the plug connector is well known, for instance from US-A-4 269 467, which is considered or the closest prior art. Fig. 9 shows an other example of such a receptacle connector disclosed in Japanese patent application Kokai No. 8-64288. This connector 50 comprises a shield case 51, a housing 52 having a receiving cavity 53 into which a mating plug connector (not shown) is inserted from above. A plurality of terminals 54 are provided in the connector 50 such that the contact sections 54A extend diagonally within the receiving cavity 53. A holding block 55 is provided in the connector 50 to hold the middle section of the terminals 54 such that the connection sections 54B project from the housing 52. As shown in Fig. 10, the holding block 55 is made separately from the housing 52 but molded integrally with the terminals 54, followed by forming the contact sections 54A by bending. The completed holding block 55 is inserted into the housing 52. When the mating plug connector is inserted into the receiving cavity 53, the contact sections 54A are brought into spring contact with the terminal of the plug connector. In the above connector, however, the housing 52 and the holding block 55 are molded separately, the terminals must be formed by bending prior to insertion of the holding block 55 into the housing 52 so that the manufacturing process is complicated, resulting in the increased manufacturing cost. Prior to the assembly, the number of parts is too many to manage easily. Accordingly, it is an object of the invention to provide an electrical connector capable of being made by a simple process at a low cost and a method of making the connector. The above object is achieved by the invention as claimed in claim 1. Embodiments of the invention will now be described by way of example with reference to the accompanying drawings in which: Fig. 1 is a sectional view of an electrical connector according to an embodiment of the invention; Fig. 2 is a perspective view of terminals prior to the molding of a housing; Figs. 3 and 4 are perspective and sectional views of the terminals after the molding but prior to cut off of carriers, respectively; Fig. 5(A) is a plan view of the terminals; Figs. 5(B) and (C) are sectional views taken along lines B- and C-C of Fig. 5(A), respectively; Fig. 6 is a sectional view of the middle sections of terminals; Fig. 7 is a sectional view of an electrical connector according to another embodiment of the invention; Fig. 8 is a sectional view of an electrical connector according to still another embodiment of the invention; Fig. 9 is a sectional view of a conventional electrical connector; and Fig. 10 is a perspective view of a terminal block for the conventional connector. In Fig. 1, a receptacle connector 10 comprises a housing 11 with a receiving cavity 12 for receiving a plug connector 30 in the direction of an arrow A. A plurality of terminals 20 are supported by the housing 11 that is made of an insulative material. As shown in Figs. 1 and 3, the housing 11 is molded integrally with the terminals 20 such that the receiving cavity has a front opening (to the left in the figure) and a lower opening. A through-hole 13 is provided in the upper wall of the housing 11 which holds the terminals such that an attaching leg 14 extend rearwardly from the rear face 11A of the housing 11 for insertion into an attaching hole P1 of a circuit board P. The terminals 20, which are held by the housing 11, are arranged in two tiers. The upper or lower terminals 21 or 22 has a flexible contact section 21A or 22A, a connection section 21B or 22B to be soldered to a circuit board P, a middle section 21C or 22C between them. As shown in Fig. 2, the upper terminal 21 extends diagonally in the direction of terminal arrangement from the straight contact section 21A, to the straight middle section 21C, and again diagonally to the connection section 21B. The lower terminal 22 is bent in the opposite direction to the upper terminal 21. Referring back to Fig. 1, the contact sections 21A and 22A are formed by bending the straight sections indicated by dotted lines through broken lines to the diagonal sections indicated by the solid lines. The receiving cavity 12 is made sufficiently large to allow such formation of the contact sections 21A and 22A. In Figs. 3 and 4, the terminals 21 and 22 are connected at opposite ends to carriers 21D and 21E, and 22D and 22E, respectively. The terminals 21 and 22 are molded integrally with the housing 11 such that a set of four terminals are grouped in each tier. During the molding process, the middle sections 21C and 22C of the terminals 21 and 22 are held by the upper and lower holding molds that are inserted through the through-hole 13. The above two sets of terminals 21 and 22 are bent laterally and vertically such that the contact sections 21A and 22A are spaced at predetermined lateral and vertical intervals and the middle sections 21C and 22C are supported by the holder mold without difficulty. As shown in Fig. 5(A), a lateral projection 21C-1 or 22C-1 extends from the middle section 21C or 22C in the arranging direction opposite to each other. The arrangement of the terminals are shown in section at different positions in Figs. 5(B) and (C), respectively. As shown in Fig. 6, a set of holding molds T1 and T2 holds the middle sections 21C and 22C from above and bottom. Since the lateral projections 21C-1 and 22C-1 extend in the opposite directions, it is assured that the holding molds T1 and T2 hold the middle section 21C and 22C (lateral projections 21C-1 and 22C-1) between them from above and bottom. A mold flows into a space between the holding molds T1 and T2 to form a part of the housing 11. Thus, the terminals 21 and 22 with the carriers are held by the housing 11 as shown in Fig. 3. Since the middle sections are held by the holding molds T1 and T2 from above and bottom, they do not move during the mold process to assure accurate determination of the distance between the terminals. Then, the carriers 21E and 21D are cut off at dotted lines X1A and X1B, and X2A and X2B, respectively, and the contact sections 21A and 22A are bent to provide the complete connector 10 as shown in Fig. 1. In Fig. 1, a mating plug connector 30 comprising a housing 31 and a plurality of terminals 32 held in the housing 31. A plurality of channels 33 are provided in the housing 31 at positions corresponding to the terminals 21 and 22 for guiding the contact sections 21A and 22A of the terminals 21 and 22. When the plug connector 30 is inserted into the receiving cavity 12 of the receptacle connector 10, the contact sections 21A and 22A are guided into the channels 33 and brought into spring contact with the contact sections 32A of the terminals 32. Each of the terminals 32 has a connection blade 32B, which pierces the insulation of a cable for connection with the core wire. A lock release lever 34 extends rearwardly from the bottom of the plug connector 30. By squeezing the release lever 30, the engagement between the connectors 10 and 30 is released. In Fig. 7, an attaching arm 14 extends upwardly from the top of the housing 11, and the connection sections 21B and 22B of terminals 21 and 22 project upwardly from the top of the housing 11. The upward bending of the connection sections 21B and 22B is made prior to the molding of the housing 11. In Fig. 8, the terminals 21 and 22, which are arranged in two tires in Fig. 7, are arranged in a single level, and only the connection sections 21B and 22B are offset according to the connection positions of the circuit board. As has been described above, according to the invention, the terminals are molded integrally with the housing as a unit and then bent once to provide an integral connector so that the manufacturing process is very simple, resulting in the reduced manufacturing cost. Since the terminals are molded integrally with the housing, they are retained securely, and the positioning between the terminals is very precise due to the high precision of the molds.

Claims: An electrical connector (10) comprising: a housing (11) having a receiving cavity (12) for receiving a mating connector (30); a plurality of terminals (20; 21; 22) arranged in said housing at predetermined intervals; each of said terminals (20; 21; 22) made by bending a metal strip so as to provide a middle section supported by said housing (11), a flexible contact section extending diagonally into said receiving cavity, and a connection section projecting from said housing (11); said middle sections being supported by said housing (11) by integral molding; and said receiving cavity being made sufficiently large to bend said contact sections in said receiving cavity; characterized in that said housing (11) is provided with a through-hole (13) at a position corresponding to said middle sections of said terminals (20) so that a holding mold supports said terminals (20; 21; 22) in said through-hole (11). The electrical connector (10) according to claim 1, wherein each of said terminals (20) is provided with a lateral projection within said through-hole (13). The electrical connector (10) according to claim 1, wherein said terminals (20; 21; 22) are arranged in a plurality of tiers such that said lateral projections are offset in different tires. A method of making the electrical connector (10) according to claim 1, said method comprising the steps of: providing a plurality of terminals/carrier materials in which said terminals are connected at opposite ends by said carriers; integrally molding said housing (11) and said terminal/carrier materials; cutting off said carrier to provide said individual terminals (20; 21; 22); and bending an end of each of said individual terminals (20; 21; 22) into said receiving cavity.

Inventors: HIROKAWA KENICHI, SUMIYOSHI TAKESHI, HIROKAWA, KENICHI, SUMIYOSHI, TAKESHI, Hirokawa, Kenichi, c/o Hirose Electric Co.,Ltd., Sumiyoshi, Takeshi, c/o Hirose Electric Co.,Ltd.
Applicants: HIROSE ELECTRIC CO LTD, HIROSE ELECTRIC CO., LTD.
Application year: 2001
Main classification: H01R24
IPC codes: H01R13, H01R43, H01R24