JPH0515732Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Purpose of the Invention (Field of Industrial Application) The present invention relates to a post header for a memory card, and more specifically, to an improvement in the arrangement of posts in a header housing.

(Prior Art) Reading or writing data files on an IC memory card is performed by inserting the card into a card receptacle in a reader/writer that controls transmission and reception with a reader or computer.

Further, to explain this with reference to FIGS. 1 and 2 of the present invention, the card receptacle has a post header 3 provided with a guide frame 2 for the memory card 1 to be inserted. A large number of posts 4 are arranged in a row. on the other hand,
Similarly, a large number of receiving side contact pieces 6 are arranged on the connector 5 provided at the insertion tip of the card 1. These posts 4 and receiving side contact pieces 6 are fitted and connected to each other in a corresponding manner.

In order to achieve such a fitting connection, the receiving side contact piece 6 is formed to have an elastic shape and structure in order to obtain an appropriate clamping pressure against the inserted post 4, and its contact surface is electrically connected. Gold plating has been applied to reduce contact resistance. On the other hand, as the post 4, a flat pin formed by punching out a flat plate is used from the viewpoint of cost and ease of assembly to the header housing.

However, according to the post 4 having such a shape,
The connection with the receiving side contact piece 6 is a surface contact, and the contact surface and contact pressure are not stable. As a result, the connection state of each circuit becomes uneven, and there is a possibility that the circuit operation lacks stability.

Therefore, recently, there has been a tendency to use posts 4 made of round pins in order to obtain line contact that easily maintains uniformity of contact state.

(Problem that the invention aims to solve) The special feature of the memory card connector mechanism is that the connecting parts of each circuit are extremely small, and it is required to withstand multiple insertions and removals (more than 5,000 times). Ru. Since a large number of each connection part under these conditions are arranged in parallel, the receiving side contact piece 6 is formed to have a low contact pressure type to cope with the above-mentioned multiple insertions and removals and to reduce the operating force during insertion and removal. It is considered as a measure.

On the other hand, the post 4 is required to have a round head shape in order to improve fitting positioning with the receiving side contact piece 6 and ease of inserting the post.

In order to meet the above-mentioned requirements for the post 4, when the tip of the round pin is formed into a round head (bullet-shaped) by embossing and cutting, a burr fracture surface is generated on the tip head surface. This fracture surface is post 4
When assembled into the header housing, if it is located in the direction in which it comes into sliding contact with the contact surface of the receiving side contact piece 6,
When mating with the contact piece 6, the contact surface may be damaged.
The plating coat on the contact surface is damaged. Moreover, if the direction of assembly of the posts 4 (the orientation of the fractured surface) is uneven among the many posts 4 in the header, each card 1 may be used in several readers, etc. On the contact surface of the receiving contact piece 6, a large number of scratches are generated due to the irregular fracture surfaces. As a result, it is inevitable that poor contact with the post 4 will occur.

On the other hand, when the post 4 is made of a round pin, when it is assembled into the header housing, it rotates in the circumferential direction, and the directions of the fractured surfaces tend to be irregular.

An object of the present invention is to provide a post header for a memory card that can prevent the receiving contact piece from being damaged by the fractured surface at the tip head of the post made of the above-mentioned round pin.

(2) Structure of the invention (means for solving problems) The invention includes a plurality of posts that respectively contact a plurality of receiving contact pieces of a memory card, and a jig to hold each of the posts that are press-fitted. The post header for a memory card is provided with a housing, and each receiving side contact piece has two opposing contact pieces.

Each of the posts is formed by cutting a wire rod having a circular cross section, and each of the posts has a tip head shaped like a warhead with a burr fracture surface, and a base end opposite to the tip head has at least a warhead shape. A portion of each post is formed into a non-circular shape, and each post is press-fitted into the housing with the base end portion being held unrotatably by the jig with the burr fracture surface aligned in a certain direction. and each of the posts is assembled with the memory card so that, when assembled with the memory card, the burr fracture surface is located midway in the opposing direction of the contact surface of each of the receiving contact pieces and parallel to the contact surface. , disposed to be received between the contact surfaces.

(Function) When inserting a memory card into the header, each post always ensures that the fractured surface is outside the contact surface area of the receiving contact piece and that a stable line contact condition is achieved through smooth surface contact with the contact surface. functions.

(Example) In FIG. 3, the band 10 is made of a band-shaped thin metal plate, and is wound on a reel 11, and during the process of being rewound and transported, or in advance, the band 10 has holding claws attached to both side edges.
2, and holding claws 13 are punched out and arranged in a row at regular intervals in the longitudinal direction at the center of the upper surface thereof.
These holding claws 12 and 13 are successively folded up perpendicularly to the upper surface of the band 10 as it is transported.

On the other hand, a post material 14 made of a so-called round metal wire material with a circular cross section and a smooth surface is wound around the reel 15, and is unwound and transported in a direction intersecting the direction in which the band 10 is transported. A star section 16 is then formed by a stamp (not shown) (see FIG. 4). The post material 14 on which the star section 16 is formed is
The star section 16 is held between the holding claws 12 that stand up on both side edges of the band 10 and is held across the band 10, and the holding claw 13 that stands up in the center is folded back. The post 4 is restrained (see FIG. 5), and in this state, it is sequentially cut into a predetermined length by a cutting machine (not shown) to form a post 4 in a semi-processed state. However, this cutting may be performed before the post material 14 is held.

In FIG. 6 and FIG. 8, each post 4 held by the band 10 has its tip head 4a pressed by push-cutting blades (not shown) from both directions during the transfer process of the band 10. The part is formed into a warhead shape, and the protruding material burr is cut off at the final end of the press. As a result of this cutting, a rough, strip-shaped burr fracture surface 4b is generated in the axial half-cut direction of the tip head 4a.

In FIGS. 7 and 8, each post 4 is further pressed by a pressing device (not shown) from four directions during the transfer process, as shown by the base end 4c, and is formed into a rectangular cross-section. Ru.

As shown in FIG. 9, each post 4 on the band 10 whose distal head 4a and proximal end 4c have been processed
The third
As shown in the figure, it is wound onto a reel 17.

10 and 12, the band 10 that holds the posts 4 wound on the reel 17 in an aligned state is fed into a predetermined area while being rewound, and the base end of each post 4 that arrives here is 4c
On the side, there is a holding hole 1 with a square cross section into which it is loosely inserted.
A jig 19 having a diameter of 8 is installed, and while the post 4 is held by the jig, the band 10 is detached by a band detachment means (not shown).

In FIGS. 13 and 14, band 10
After the post 4 has been removed, it is temporarily inserted into the insertion hole 21 of the header housing 20 disposed on the side of the distal head 4a, and finally the star section 16 is engaged with a predetermined part of the insertion hole 21. The post 4 is completely press-fitted so as to be fixed, and the base end 4c side is bent to form a connection part to a circuit board (not shown), and the assembly of the post 4 is completed. Although FIGS. 13 and 14 show an example in which the posts 4 are arranged in two upper and lower stages, it goes without saying that they may be arranged in one stage.

Therefore, each of the assembled posts 4
is arranged in the header housing 20 with the directionality of each surface of the broken surface 4b of the distal head 4a and the proximal end 4c on the band 10 maintained in an orderly manner.

Therefore, as shown in FIG. 15, in each post 4, the fracture surface 4b of the tip head 4a is located in the middle of the opposing contact surfaces of the two contact pieces 6a constituting the receiving side contact piece 6. It is positioned substantially parallel to the contact surface, does not contact the contact surface, and has a portion other than the fracture surface in line contact with the contact surface.

(3) Effects of the invention The post header according to the invention has the following effects.

That is, the posts are received between the contact surfaces with the burr-broken surfaces of their tip heads positioned midway between the contact surfaces of the receiving contact pieces in the opposing direction and approximately parallel to the contact surfaces, without damaging the contact surfaces. Moreover, the non-circular base ends of the posts are held by a jig, so that the burr-broken surfaces can be aligned, and therefore variation in the fixed orientation of the posts when they are inserted into the housing can be greatly reduced. Therefore, even if the memory card is inserted and removed many times, a long life is obtained and stable electrical reliability is ensured.

Furthermore, since each post can be formed by cutting a wire rod having a circular cross section, it can be mass-produced at low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view showing an example of a memory card connector mechanism; FIG. 2 is a perspective view showing an example of a post and a receiving contact piece in the connector mechanism; Figure 3 is a process diagram showing how the post is held in the holding band in the post header, Figure 4 is a perspective view of the star section of the post material, and Figure 5 is a partial side view of the post held in the band. Figure, 6th
The figure is a sectional view along the line of Fig. 3, and Fig. 7 is a cross-sectional view along the line of Fig. 3.
Figure 8 is a perspective view of the main parts of the completed post, Figure 9 is a partial side view showing how the post is held in the band, and Figure 10 is the proximal end of the post. 11 is a sectional view of the state held in the jig, and FIG. 11 is a partial sectional view taken along the line of FIG. 10.
The figure is a cross-sectional view of the post separated from the holding band in the holding state, Figures 13 and 14 are cross-sectional views showing the post assembly process in the post header, and Figure 15 is a cross-sectional view of the post and the receiving contact piece of the memory card. FIG. 3 is a cross-sectional view showing a state of contact with a contact portion. 1...Memory card, 3...Post header, 4...Post, 4a...Tip head, 4b...
Fractured surface, 4c... base end portion, 6... receiving side contact piece,
6a...Contact piece, 19...Jig, 20...Housing.

Claims (1)

[Claims for Utility Model Registration] A system comprising a plurality of posts that respectively contact a plurality of receiving side contact pieces of a memory card, and a housing that holds each of the posts that are press-fitted with a jig,
In the memory card post header in which each of the receiving side contact pieces has two contact pieces facing each other, each of the posts is formed by cutting a wire rod having a circular cross section, and each of the posts is formed by cutting a wire rod having a circular cross section, and the tip head thereof has a substantially burr-broken surface. Each post is formed into a warhead shape, and at least a portion of the base end opposite to the tip head is formed into a non-circular shape, and each post has the burr fracture surface aligned in a certain direction. The proximal end portion is held unrotatably by the jig and press-fitted into the housing and assembled, and when each post is assembled with the memory card, the burr broken surface is on each receiving side. The post header is disposed so as to be received between the contact surfaces of the contact piece so as to be located between and parallel to the contact surfaces in the opposite direction.