JP2655803B2 - Positioning device for electronic components in socket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning device for mounting an electronic component mounted on a socket, in particular, a relatively long and flat lead frame to which an IC chip is bonded, in a fixed position on the socket.

2. Description of the Related Art A lead frame has a group of leads punched from a band-shaped sheet material, the outer ends of the group of leads are connected by ears of the sheet material having a plurality of holes, and the inner ends of the group of leads are sheet materials. Is bonded to an IC chip mounted on a base member punched and formed at the center of the IC chip. Such a lead frame is inspected using a socket. At this time, a positioning means for mounting the lead frame at a fixed position and associating each lead of the lead frame with each contact of the socket is indispensable. Conventionally, a large number of holes arranged in the ears of the lead frame are used as the positioning means, and three or four posts provided in the socket are inserted into the holes near the end of the row to prevent rotation and deviation. ing. Usually, the lead frame has a plurality of lead patterns arranged side by side and punched out to give an elongated shape.In order to prevent rotation and slippage in such an elongated lead frame, insert the post into corner portions at both ends in the longitudinal direction. Design is required.

However, in the above-mentioned conventional example, the rotation stop and the shift stop are effectively achieved, but the posts required for positioning are inserted into the holes provided at the corners at both ends of the lead frame. Therefore, there is a problem that the hole is often caught by the post due to the inclination at the time of attachment and detachment of the lead frame, and the frame is difficult to be pulled out. Also, the lead frame has a problem that warpage and manufacturing error increase near both ends, it is difficult to obtain the accuracy of posts and holes, and there is a problem that positioning errors occur, and all posts conform to the size and position of holes. With design constraints that must be made. Further, in the conventional example, a post insertion hole is provided in each of the opposite ear portions of the lead frame. If such a hole is provided in only one of the ear portions, implementation is not possible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and as a means for inserting the above-mentioned problem, the socket is inserted into a hole formed in an ear portion along one outer edge of the lead frame. And a post that is a displacement preventing member that prevents lateral movement of the lead frame, and a rotation that abuts on a linear portion that forms the other outer edge of the electronic component to prevent rotation of the electronic component about the displacement preventing member. A positioning device for an electronic component in a socket provided with a post as a stop member is provided.

According to the present invention, the post abutting on one outer edge of the lead frame and the post inserted into the hole formed in the ear along the other outer edge of the lead frame cooperate. As a result, good rotation prevention and displacement prevention effects can be obtained, and the electronic component can be securely mounted on the socket in a fixed position. If the slip prevention post inserted in the hole is inserted into at least one hole of the lead frame, the positioning effect can be obtained in cooperation with the detent post abutting on the outer edge. In addition, since the insertion position of the post is not limited to both ends of the electronic component and can be freely selected, for example, disposed near the center, a plurality of posts can be inserted into a plurality of holes at both ends of the left and right ears of the lead frame as in the conventional example. It effectively solves the problems of insertion and removal of the lead frame, such as hooking with the post when attaching and detaching the lead frame, and associated deformation. The warpage can be avoided, and the intended positioning purpose can be achieved without regret by using the post inserted in the hole of the lead frame and the post abutting on the outer edge of the frame.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. The socket base 1 made of insulating material is an electronic component 2
Has a large number of contacts 4 corresponding to a large number of leads protruding to the side and a large number of leads 3 backed up by an insulator, and each lead 3 is placed on each contact 4 and a socket base 1 is provided. When the cover 5 is closed, the lead 3 is pressed against the contact 4 by the press pad 15 provided on the inner surface of the cover 5 to obtain a contact pressure. The cover 5 is connected to the socket base 1 via a hinge so as to be openable and closable, or is formed by a component formed separately from the socket base 1 or a jig of a robot. Reference numeral 6 denotes a lock member for holding the cover 5 closed. As described above, the lead frame 2A forming the electronic component 2 is formed by punching a plurality of units of a lead group on a strip-shaped metal sheet,
The IC support base 7 is integrally punched at the center, and the outer ends of each group of leads 3 are connected at the left and right ears 9 of a frame in which a plurality of holes 8 are perforated.
The C chip 10 is supported and bonded to the inner ends of the three lead groups by bonding. The IC chip 10 is covered with an insulating resin 11 and mounted on a socket. After the inspection, the above-mentioned ears 9 having holes 8 are cut off to separate the lead group.
This socket is provided with positioning means for mounting the lead frame 2A at a fixed position. As shown in FIG. 4, the lead frame 2A has a rectangular shape and has two outer edges extending in parallel with the longitudinal direction. I have. As shown in FIGS. 1 to 6, the positioning means is inserted into the hole 8 provided in the ear part 9 along the one outer edge in the electronic component mounting part of the socket to prevent the lead frame 2A from moving laterally. The post 12a, which is the shift preventing member 12, is in contact with the linear portion forming at least the other outer edge of the opposing outer edge of the lead frame 2A to prevent the lead frame 2A from rotating about the shift preventing member 12. And a post 13a serving as a rotation preventing member 13. When the electronic component mounting table 14 is mounted on the socket base 1 so as to be vertically movable, the post 12a for preventing the displacement and the post 13 for preventing rotation are provided.
a is provided on the mounting table 14. FIGS. 1 to 6 show four posts 13a, each of which is formed by four cylinders which abut against both ends of a linear portion forming the outer edges of the left and right ears 9 of the lead frame 2A to stop the rotation. At the same time, a single post 12a is inserted into any one of the holes 8 formed in the ears 9 along the one outer edge and is used as a slip stopper 12. This post 12
a selects and inserts one hole 8 near the middle part of the lead frame 2A. That is, the two posts 13a erected along one outer edge of the lead frame 2A are arranged near both ends of the frame, and the post 12a is arranged in the middle area of the frame regulation area by the two posts 13a, and the other is arranged. Insert into the hole in the ear 9 along the outer edge. Although not shown, four posts 13 forming the detent member 13 are provided.
The other three members can be used as the detent members 13 without using one of the members a. 7 and 8 show another embodiment provided in accordance with the gist of the present invention. FIG. 7 shows a plurality of posts 13a that abut on both ends of a straight portion forming one of the two outer edges of the lead frame 2A to prevent rotation of the frame. A single post 12a forming the above-mentioned displacement preventing member 12 is arranged near the middle part of the other and near the middle part of the other outer edge, and the frame 12A is positioned by the cooperation of both. FIG. 8 shows an embodiment in which the posts 12a forming the above-mentioned displacement preventing member 12 are inserted into holes 8 formed in the left and right ears 9 near the middle of the lead frame 2A. In this case, the posts 13a forming the detent member 13 are disposed at least near both ends of one outer edge of the frame according to the above-described embodiment, and the posts 12a are disposed in a region between the posts 13a. Of course, the present invention can be implemented by appropriately selecting the above embodiments or by appropriately combining them. The post 13a forming the rotation preventing member 13 circumscribes a linear portion on the outer edge of the electronic component 2 in which the IC chip 10 is bonded to the center of the frame 2A, and is aligned with, for example, a positioning notch provided on the outer edge. Does not include the case. When the posts 12a and 13a are formed as cylinders, the posts 12a and 13a abut against the straight portions on the outer edges of the frame at the columns of the cylinder.

According to the present invention, the post abutting on one outer edge of the lead frame and the post inserted into the hole formed in the ear along the other outer edge of the lead frame cooperate. By working well, it is possible to obtain a good rotation preventing and displacement preventing effect, and it is possible to reliably mount the lead frame on the socket at a fixed position. If the displacement prevention post inserted in the hole is inserted into at least one hole of the lead frame, the positioning effect can be obtained in cooperation with the detent post abutting on the outer edge. In addition, since the insertion position of the post is not limited to both ends of the electronic component and can be freely selected, for example, disposed near the center, a plurality of posts can be inserted into a plurality of holes at both ends of the left and right ears of the lead frame as in the conventional example. It effectively solves the problems of insertion and removal of the lead frame, such as hooking with the post when attaching and detaching the lead frame, and associated deformation. The warpage can be avoided, and the intended positioning purpose can be achieved without regret by using the post inserted in the hole of the lead frame and the post abutting on the outer edge of the frame. Further, the present invention is effective as a positioning device in a case where one ear of the lead frame has no hole.

[Brief description of the drawings]

FIG. 1 is a plan view of an IC socket showing an embodiment of the present invention.

FIG. 2 is a side view of the socket in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a plan view of a lead frame.

FIG. 5 is a plan view showing a state where a lead frame is mounted on the IC socket.

FIG. 6 is a side view of the socket in FIG. 5;

FIG. 7 is a plan view showing another embodiment of the positioning device in the socket.

FIG. 8 is a plan view showing another embodiment of the positioning device in the socket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Socket base 2 Electronic component 2A Lead frame 3 Lead 4 Contact 8 Hole 9 Left and right ears 12a Post for preventing slip 13a Post for preventing rotation

Claims (3)

(57) [Claims] An IC chip is bonded to a central portion of an elongated lead frame having two outer edges extending in parallel to each other, and a number of holes are formed in rows along ears along the outer edge of the lead frame. In a positioning device for mounting an electronic component in a socket, the socket is provided with a post (12a) which is inserted into a hole of an ear portion along one of the outer edges to prevent misalignment, and the other outer edge is attached to the socket. A positioning device for an electronic component in a socket, comprising a plurality of posts (13a) for abutting against a formed linear portion to prevent rotation. 2. The post according to claim 1, wherein the post (12a) for preventing displacement comprises a single post (13a) inserted into the hole located in the area between the posts (13a). Positioning device for electronic components in sockets. 3. A plurality of posts (13a) are arranged near both ends of the outer edge of the lead frame, and the posts (1a) are provided.
2. The lead frame according to claim 1, wherein the second frame is inserted into a hole near an intermediate portion of the holes formed in the outer edge of the lead frame.
Or a positioning device for electronic components in the socket according to 2.