JPH0429564Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a leadless chip carrier holding fitting attached to a leadless chip carrier socket, and more particularly to a leadless chip carrier socket holder.

Recently, the development of electronic components such as ICs has been greatly advanced. However, such electronic components can be connected to the printed circuit board through the carrier socket by inserting a leadless chip carrier (hereinafter referred to as the carrier) into a leadless chip carrier socket (hereinafter referred to as the socket) provided on the printed circuit board. However, when inserting and holding the carrier into the software, the carrier does not have any holding force against the inserted socket, so a presser metal fitting is used to maintain the carrier in the socket. There is a need for this, and the present invention provides a new presser metal fitting for use in such applications.

However, the presser metal fittings conventionally used are those made of sheet metal processing such as stainless steel plates or copper alloy plates, and after the carrier is inserted into the socket and the presser metal fittings are placed, the presser metal fittings are made of elastic material. There are also known devices that are fixed by deformation, bending, rotation, etc., and one example of this is Design Registration No. 701654. However, the presser fittings of this type have many drawbacks, such as being expensive and requiring cumbersome operations to install, and improvements are currently being sought from the viewpoint of practicality.

Furthermore, since the carrier presser of the prior art is manufactured by processing a thin plate such as a stainless steel plate or a copper alloy plate, there is a problem in that heat radiation is insufficient and undesirable heat generation occurs.

Here, the inventors of the present invention have provided a carrier holding fitting that eliminates the drawbacks of the prior art, is inexpensive, and can be installed easily and reliably.

According to the present invention, a dowel is provided on the side of a polygonal socket, and the end of a U-shaped or loop-shaped wire material is suspended from the dowel to strengthen the connection between the carrier and the socket. To provide a carrier holding fitting mounted on a socket which prevents accidents such as the carrier from slipping or coming off from the socket and which has excellent heat dissipation properties since it does not have a heat shielding surface. It is something.

The presser fitting according to the present invention will be briefly explained with reference to FIGS. 1 to 3. It is made of elastic metal wire, such as stainless steel wire, mild steel wire, and hard steel wire with a diameter of about 0.5 to 1.5 mm. After processing the end of an elastic wire material made of a material into a loop or U-shape and suspending the end of the material into a dowel provided on the side of the socket, the material is raised along the side. It bends backward and expands, extends along the joining line between the carrier and the socket, converges to the opposite edge of the socket, descends along the side, and is suspended in a dowel provided approximately in the center of the side. It will be done. Furthermore, it is formed to curve or bend downward while extending along the inner edge of the socket, thereby promoting the elasticity of the presser metal fitting.

To explain with reference to the drawings, in FIG. 1A and FIG. 2, one dowel 1, 1'(1' is not shown) is provided approximately in the center of the opposing side surfaces of the socket, and the U-shape is formed. After the end portion 18 is hooked to the dowel 1, it rises up, then expands upon reaching the upper edge, extends along the joining line between the carrier and the socket, converges upon reaching the end of the socket, and then bends downward to extend its length. The U-shaped end is locked into the dowel 1'. Furthermore, it is also preferable to use a method in which the inner edge of the socket, ie, extending along the joining line, is curved or bent downward to increase its elasticity and strengthen the connection.

Alternatively, according to FIG.
Dowels 15, 15'(15' are not shown) are provided near the ends of the dowels 2, 13, and after suspending the annular parts 16, 17 of the linear body whose both ends are rounded into an annular shape, After reaching the upper edges of the side surfaces 12 and 13, it bends and expands, then extends along the joining line, converges and descends along the upper edge of the side surfaces 10, and engages the end of the wire material rolled into a U-shape. The stop portion 18 is hooked onto the dowel 11 and locked.

As shown in FIG. 1B, the presser metal fitting of the present invention, which is fixed to the dowel 15 or 15', is formed into a loop or annular shape having a diameter suitable for fitting the dowel to the dowel. It is used as This type of presser metal fitting is further curved downward in the section extending along the joining line or bent as shown in Figure 3, 5 to improve the elasticity of the presser metal piece and create a buffering effect against applied vibrations and shocks. This increases the holding force of the presser fitting and allows the carrier to be stably held in the socket. Each dowel may be formed integrally with the socket when the socket is molded, or may be attached afterwards.

The presser metal fitting of the present invention is manufactured by bending a metal wire material, so it is inexpensive and has excellent carrier holding power in the socket. Because it is shaped like a rubber band, it has excellent elasticity and durability, so it can be used safely for a long time, and it also has excellent heat dissipation.
The presser fitting of the present invention can be said to be an extremely effective carrier presser.

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating the presser fitting of the present invention. FIG. 2 is a perspective view showing the state in which one specific example is attached to the presser fitting of the present invention. FIG. 3 is a perspective view showing the mounting process of another specific example of the presser fitting of the present invention. FIG. 4 is a perspective view showing the mounting state of the specific example of the presser fitting of the present invention shown in FIG. 3. 2, 11...Dowel, 5...Joining line, 15...Dowel.

Claims (1)

[Scope of utility model registration request] The U-shaped portion provided at one end of the elastic wire member is engaged with one of the dowels provided at the center of the opposing side walls of the socket for leadless chip carrier, or One dowel is provided near the end of the side wall of each opposing side plate of the leadless chip carrier socket, and one dowel is provided at the center of the side wall of the side plate opposite to the side plate sandwiched by the same side plate. The annular parts provided at both ends of the wire material are engaged with the dowels on the side wall of the board, and the wire material rises up, reaches the upper edge of the same side board, bends, and runs along the joining line between the leadless chip carrier and the socket. It stretches, reaches the upper edge of the opposing side plate, converges and refracts, descends along the side plate side surface, locks the U-shaped part at the other end of the wire material with the remaining dowel, and in some cases straight line between both ends. A presser fitting for a leadless chip carrier characterized by being made of a wire material curved downward.