JPH067246U - Carrier tape reel - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a carrier tape reel for which the number of baking treatments can be easily confirmed and which is easy to manufacture. [Structure] A part of the reel 1 has a detachable tongue-shaped indicator 2 for confirming the number of baking processes.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is vulnerable to electrostatic breakdown of various small electronic parts, precision parts and surface mounting parts such as ICs, especially ICs, and is packaged with sealing resin, etc. It is a heat-resistant carrier tape winding reel (hereinafter referred to as reel) that is used for storing and transporting package parts that need to reduce the moisture absorbed inside by baking, and confirm the number of baking processes. To a reel having a releasable indicator for cutting.

[0002]

[Prior art]

 In recent years, the high-density mounting of electronic parts has been promoted by the high integration of semiconductor elements, the miniaturization and thin packaging, and the high-density mounting of these elements on the substrate, especially the progress of Surface Mount Technology (SMT). Have been steadily producing results. In SMT, the package parts of these devices are mounted on a printed circuit board with solder paste screen printed using an automatic mounting machine, and then the entire board is heated to a temperature of about 250 ° C, which is higher than the melting point of the solder. It is heated (hereinafter referred to as the reflow process) to melt the solder and connect the lead terminal of the package component and the board electrode. In this case, the package parts in which elements such as ICs are sealed with resin are also exposed to the above high temperature, but the moisture absorbed by the sealing resin during storage suddenly evaporates, and the internal pressure inside the package increases. However, there is a problem in that package cracking occurs, which lowers the reliability of the IC or renders it inoperable, resulting in a significant decrease in product yield.

In order to prevent the occurrence of cracks in the reflow process of these package parts, in order to lower the water absorption of the sealing resin, it has been possible to evaporate the moisture before mounting the package parts on the substrate at 100 ° C. or higher. The baking process is performed at a temperature of several hours to several tens of hours, and typically at 125 ° C for 24 hours. In addition, after reusing under the same conditions, it is necessary to re-use the product after it has been suspended during use and the remaining amount has been stored.

The conventional method of carrying out this baking treatment is to arrange and store the package parts in a tray made of a heat-resistant metal or resin that can withstand the above baking conditions, and put them in an oven or the like for a predetermined time. It was carried out. However, the transfer and processing methods by these trays are complicated because the number of mounted pieces per sheet is small, and the positional accuracy of the stored package parts is inferior to that of the carrier tape, and problems occur during automatic mounting. Since there is a problem that it is easy to do, it is hoped that the carrier tape can be baked while it is wound on the reel, and the material and structure of the carrier tape and reel were being studied. .

[0005]

[Problems to be solved by the device]

 The process of baking the carrier tape wound on such a reel is performed in-process before shipment at the semiconductor manufacturer, pre-process at the set manufacturer, or interrupted as described above. In some cases, such as reprocessing under the same conditions when reusing after storing the remaining amount. However, these baking processes may cause deterioration of the packaged electronic components themselves, such as oxidation of leads of package components and effects on the sealing resin.Therefore, the total number of treatments has been conventionally severely limited. Has been done.

However, in such a situation, there is no conventional method for confirming how many baking processes the package parts stored in the carrier tape to be used have undergone the baking process so far, and the process exceeds the limit. For the above-mentioned reasons, the reliability of the equipment that uses the parts could be significantly impaired when the parts that were used are used.

[0007]

[Means for Solving the Problems]

 As a means for confirming the heat treatment history of such package parts, it is optimal to provide some kind of indication mechanism on each package part itself, but it is not technically and costly a realistic method. Therefore, it is appropriate to provide this on packaging materials such as carrier tapes, top tapes, and reels, because the history of heat treatment is always the same as that of the package parts to be baked.

Of these, the reel is most suitable in view of its shape, manufacturing process, etc., and as a result of various studies, an indicator that is easily cut (broken) for counting the number of baking processes is installed on the reel. It has been found that these problems can be solved and the present invention has been completed, in which a part of the reel is a releasable, preferably tongue-shaped, piece for confirming the number of baking processes. The gist is a reel that is characterized by having a circular indicator.

[0009]

[Action]

 Since the indicator in the present invention is one or a plurality of indicators which are installed on a part of the reel and are easy to cut, the number of baking treatments can be confirmed by breaking the indicator off each time the baking treatment is performed. Therefore, it is possible to prevent the baking process from being performed more than the specified number of times, and to contribute to the improvement of the reliability of the device in which the package parts are mounted.

[0010]

【Example】

 Hereinafter, the present invention will be specifically described based on Examples. FIG. 1 shows an example of a position where the indicator 2 is provided on the reel 1. The main dimensions and shape of the reel 1 are defined by standards such as EIA, IEC, JIS, etc., and if the requirements are met, the design of the flange 3 has a relatively high degree of freedom. The reel 1 may be installed at a position where it does not interfere with the original function of the reel 1. However, considering the force received when it is broken, the reel 1 is provided around or near the hub 4, which is relatively strong and dimensionally stable. Is desirable.

2A and 2B are enlarged views of the shape of the indicator 2, in which the base of the indicator 2 is narrowed from both sides in the width direction to facilitate cutting (breakage). It is also possible to imprint a marking 5 such as a number if necessary. 3 (a) and 3 (b) are examples of breakage means in which the root is squeezed from one side in the thickness direction, and FIGS. 4 (a) and 4 (b) are squeezed from both sides.

FIG. 5 (a) is a flat plate-shaped indicator that is a combination of a trapezoid and a circular plate, and has a notch so that the transversal surface becomes the V-shaped groove 6, and (b) shows a triangular flag-shaped one. , (C) is an arrow shape, the seams are gradually thickened, (d) is a square flag shape, (e) is a square flag shape showing the single digit of baking frequency and 10 digits (F) is a disc-shaped one in the form of a ladder.

Further, FIGS. 6A to 6E show examples of breakage means different from those shown in FIGS. 2 to 4. 6 (a) shows a V-shaped breakage means in FIG. 4, whereas FIG. 6 (b) shows a U-shaped breaking means, in which (a) has the smallest detail at a position slightly protruding from the root. On the other hand, the one without it, (c) the wedge itself as an indicator, (d) the combination of a circular plate and a rectangular plate with the V-shaped groove 6 at the base, (e) the perforation ( Through holes are shown.

Although there are no restrictions on the material and manufacturing method of the reel 1, the indicator 2 is integrated with the main body of the reel 1 in consideration of productivity and cost when the injection molding method using a synthetic resin is used. Can be formed. Further, the design and the number of the indicators 2 are not limited to those in this embodiment.

[0015]

[Effect of device]

 By cutting (breaking) the indicator each time the baking process is performed, it is possible to check the baking process history of the packed packing parts. This prevents the process from being performed more than the specified number of times by mistake, thus ensuring reliability. It can greatly contribute to improvement. Moreover, if the reel is made of synthetic resin, these indicators can be molded integrally with the reel, so that the indicator can be provided at extremely low cost and the number of bakings can be confirmed by a simple operation of cutting (breaking).

[Brief description of drawings]

FIG. 1 is a plan view of a reel of the present invention.

FIG. 2 is one of the indicators used in the reel of the present invention
In an Example, (a) is a top view, (b) is sectional drawing which follows the XX line of (a).

FIG. 3 is another embodiment of the indicator used in the reel of the present invention, (a) is a plan view, (b) is XX of (a).
Sectional drawing which follows the line.

4 is another embodiment of the indicator used in the reel of the present invention, (a) is a plan view, (b) is an XX of (a).
Sectional drawing which follows the line.

5A to 5F are explanatory views of still another embodiment of the indicator used in the reel of the present invention.

6 (a) to 6 (e) are explanatory views of another embodiment showing the breaking means of the indicator used in the reel of the present invention.

[Explanation of symbols]

 1 reel 2 indicator 3 flange 4 hub 5 engraved 6 V-shaped groove

Claims (1)

[Scope of utility model registration request] 1. A reel for winding a carrier tape, wherein a detachable indicator for confirming the number of baking processes is attached to a part of the reel.