JPH11171288A - Lead frame storage container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely such lead frames, by making the part of the internal face of the bottom on which the lead frames are to be stacked flat, and by forming grooves in the flat parts of the inside bases of the longitudinal opposite side- faces and the outside face of the bottom. SOLUTION: In a container main body 2, the internal face 21 of its bottom on while lead frames are stacked is made flat. Also, grooves 22 for avoiding distortion are formed in the flat parts of the inside base parts of the longitudinally opposite side-faces 24 of a container main body 2. Further, a large number of grooves are formed in the external face of the bottom of the container main body 2, over its entire face. By thus providing grooves 22 or the like in the internal and external faces of the bottom, distortion due to heat stress is avoided during the formation of the container main body 2 form synthetic resin, and the bottom of the container main body can be kept flat. This prevents, when the lead frames are taken out of the container main body 2 by means of a sucker, outside air from flowing in from the grooves and enables the sucker to easily such the lead frames.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage container for storing a plurality of lead frames used in a semiconductor integrated circuit device in a stacked state. The present invention relates to a lead frame storage container that can be attached.

[0002]

2. Description of the Related Art Conventionally, a lead frame used for a semiconductor integrated circuit device has been manufactured by a photoetching method or a punching method using a mold using a thin metal plate as a material. It is something that has become. Various post-processes are performed on the sheet-shaped lead frame. For example, in the case of a lead frame that has been inspected, depressed, plated, or imposed, post-processes such as cutting into individual portions and cutting and removing unnecessary portions can be given.

FIG. 5 (a) shows an example in which a lead frame (13) is conveyed, stored and transported in a state of six pieces. FIG. 5B is a plan view of a lead frame for one piece (33). When transporting, storing, and transporting a single-leaf lead frame in a subsequent process, the lead frame is stacked and stored in a box-shaped storage container.

As shown in FIG. 6, for example, a conventional lead frame storage container has a deep container body (12).
And a lid (14) that covers the container body. Reference numeral 13 denotes a lead frame to be stored. The bottom inner surface (31) of the container body (12) is provided with a large number of grooves (34) on the entire surface for keeping the bottom flat against distortion and deformation during molding. The groove (34) has a convex portion in a lattice shape, and a portion other than the lattice shape is a concave portion.
However, when the groove is provided on the entire surface at the bottom in this way, when the lead frame is taken out of the container body by the suction cup of the automatic unloading device, external air flows in from the groove and sucks the lead frame into the suction cup. Becomes difficult.

[0005] This is because, in the case of a lead frame that has been inspected, depressed, plated, or imposed, for example, the lead frame is cut into individual portions and unnecessary portions are cut and removed in a subsequent step. This is a problem when the frame is automatically unloaded from the container body.

[0006]

SUMMARY OF THE INVENTION As described above, the present invention provides a method for removing a lead frame from a container body in which a plurality of lead frames are stacked in a container body of a lead frame storage container by a suction cup. An object of the present invention is to provide a lead frame storage container which is a container body capable of securely sucking a lead frame.

[0007]

According to the present invention, there is provided a synthetic resin lead frame storage container for stacking and storing a plurality of lead frames, wherein the container main body comprises: (a) a rectangular bottom portion; Side faces at four ends (c) Notch at substantially center of longitudinally opposed side faces, (d) Flat at bottom inner face, (e) Flat at inner base of longitudinally opposed side faces And (f) a groove on the bottom outer surface of the lead frame storage container.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an embodiment of the present invention. FIG. 1 is a perspective view showing one embodiment of a lead frame storage container according to the present invention. As shown in FIG. 1, the lead frame storage container (1) according to the present invention has a container in which a portion where the lead frames are stacked on the bottom inner surface (21) is flattened so that the suction cup can easily suck the lead frame. Main body (2), lid (4) detachably attached to the container main body
It is composed of

As shown in FIG. 1, the container body (2) has a rectangular box shape. There are side surfaces (25) at both ends in the longitudinal direction, and there are side surfaces (24) in both end directions on both sides facing each other in the longitudinal direction, and a notch ( 26). The notch (26) is provided for facilitating handling of the lead frame when the lead frame (3) is stored in or taken out of the container body (2).

The container body (2) has a bottom inner surface (2) so that the suction cup can easily suck the lead frame.
The portion where the lead frames of 1) are stacked is in a flat state. In addition, a groove (22) for avoiding distortion is provided in a flat portion of the inner base of the side surface (24) facing the longitudinal direction of the container body (2). This is to avoid distortion due to thermal stress at the time of cooling when molding with a synthetic resin by an injection molding method or the like, and to keep the bottom of the container body flat. FIG. 2 is a perspective view showing the bottom outer surface (41) of the container body (2) of the lead frame storage container. As shown in FIG. 2, the bottom outer surface (41) of the container body (2) has the entire surface thereof. Are provided with a large number of grooves (42). This groove (4
In 2), the convex portions are lattice-shaped, and portions other than the lattice-shaped portions are concave portions.

The container body (2) is formed by flattening the flat portion at the inner base of the longitudinally opposed side portions (24) in FIG. 1 and the bottom outer surface (41) in FIG.
Is molded with a synthetic resin, the bottom becomes not flat due to thermal stress distortion during cooling of the synthetic resin. That is, grooves are provided on the inner surface of the bottom and the outer surface of the bottom to avoid distortion due to thermal stress and to keep the bottom of the container body (2) flat. As shown in FIG. 1, a notch (26) for facilitating the handling of a lead frame is provided in the vicinity of the center of a longitudinally opposed side surface of a container body, as in a container body (2) shown in FIG. When the left and right side portions are inferior to the distortion of the inner surface (21),
The effect of the grooves on the bottom inner surface and the bottom outer surface is great.

As described above, the fact that the portion where the lead frames are stacked on the bottom inner surface (21) is flat means that when the lead frame is taken out of the container body by the suction cup of the automatic unloading device, external air flows in from the groove. The suction cup can easily suck the lead frame without performing the operation. In addition, the flat bottom means that the lead frames are stacked flat when storing the lead frame, and the lead frame is shifted during storage and transportation of the storage container in which the lead frame is stored. It is also important to prevent problems such as movement, bending of the lead tip, and deformation of the lead frame.

In FIG. 1, the number of lead frames to be stacked and stored in the container body (2) of the lead frame storage container (1) is set to, for example, a fixed number of 100 and stored.

FIG. 3 is a perspective view showing the outside (51) of the lid (4) of the lead frame storage container (1). As shown in FIG. A large number of grooves (52) for keeping the lid (4) flat are provided on the entire outer surface (51). The groove (52) has a convex portion in a lattice shape and a portion other than the lattice shape in a concave portion.

The lead frame storage container (1) is manufactured according to the size and thickness of the lead frame, the set number, etc., the depth of the container body (2), the thickness of the lead frame (3), and the lid. (4) The amount of falling into the container body is set.

FIG. 4 is a plan view showing a state where the lead frame is stored in the container body (2) of the lead frame storage container (1) according to the present invention. In FIG. 4, a dotted line (60)
Indicates an area where the lead frame is stored. The distance (A) from the groove (22) for avoiding distortion to keep the bottom of the container body (2) flat to the lead frame is about 0.3 mm, and the gap from the side (25) is 0.3mm to the distance (B) to the lead frame
The gap of the order is provided.

The material of the synthetic resin of the lead frame container (1) according to the present invention is not particularly limited, but ABS resin (acrylonitrile-butadiene-styrene copolymer) is suitable from the viewpoint of impact resistance. It is something.

[0018]

According to the lead frame storage container of the present invention, a notch is provided in the vicinity of the central portion of the longitudinally opposed side portions so that the lead frames can be easily taken out one by one by the robot arm, and the suction cup is provided with a lead. To ensure that the frame can be securely sucked, the portion where the lead frames are stacked on the bottom inner surface is flattened, the flat portion on the inner base of the longitudinally opposed side portions, and the groove portion are provided on the bottom outer surface, and the thermal stress Since the bottom of the container body is kept flat, the lead frame can be removed from the container body with multiple lead frames stacked in the container body of the lead frame storage container by suction cups. Thus, the lead frame storage container is a container body that can easily suck the lead frame.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a lead frame storage container according to the present invention.

FIG. 2 is a perspective view showing an outer bottom portion of the container body of the present invention.

FIG. 3 is a perspective view showing the outside of the lid of the present invention.

FIG. 4 is a plan view showing a state where a lead frame is stored in the container body of the present invention.

FIG. 5A is a plan view showing an example of a state in which a lead frame is connected to six pieces. (B) is a plan view of one piece of the lead frame.

FIG. 6 is a perspective view showing an example of a lead frame storage container in a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lead frame storage container 2 ... Container main body 3, 13 ... Lead frame 4 ... Lid 11 ... Lead frame storage container in a conventional method 12 ... Lead frame container main body in a conventional method 14 ... Lid 21 and 31 ... Bottom inner surface 22 in a conventional method .. Groove 24, 25 side surface 26 notch 33 one piece of lead frame 34 bottom inner surface groove 41 bottom outer surface 42, 52 bottom outer surface groove 51 outer cover 60 lead frame is stored. A: distance from groove to lead frame B: distance from side plate to lead frame

Claims (1)

[Claims] 1. A synthetic resin lead frame storage container for stacking and storing a plurality of lead frames, the container body comprising: (a) a rectangular bottom portion; and (b) side portions at four end portions of the bottom portion. A) a notch at a substantially central portion of the longitudinally opposed side surfaces; (d) a flat portion at the bottom inner surface; (e) a groove portion for avoiding distortion at a flat portion at an inner base of the longitudinally opposed side surfaces; f) A lead frame storage container having a groove on the bottom outer surface.