JP3029481B2 - Carrier tape and its connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to various electronic parts such as semiconductors,
The present invention relates to a carrier tape used for storing, transporting, mounting and the like of precision equipment parts, and a method of connecting the carrier tape.

[0002]

2. Description of the Related Art Conventionally, a carrier tape used for storing various electronic parts such as semiconductors, precision equipment parts, etc., as shown in FIG. 1, stores a part 2 in a parts storage pocket 1 continuously provided by molding. The cover member 4 is used by sealing. On the other hand, for example, in the process of automatically loading electronic components on a carrier tape and mounting it on a printed circuit board,
The automation and speeding up of the mounting work have been rapidly progressing, and in each process, efforts have been made to operate these automatic machines more efficiently for a long time, and with this, the carrier tape has also become more accurate and stable. In addition to the demand for improved quality, development of a technology for lengthening the tape by connecting a tape before and after storing the parts has been desired.

[0003] Regarding these tape connection techniques, as a method of directly connecting two tapes, for example, Japanese Patent Application Laid-Open No.
Japanese Patent No. 24815 discloses a technique in which, when connecting tapes, a vertically symmetrical inclined surface is formed on an adhesive surface to be connected and the inclined surfaces are joined to each other. Although it is disclosed to use an agent or the like, it is practically impossible to cut the tape with an inclined angle particularly in a narrow width and small pitch tape, and in connection with an adhesive, etc. There is a high risk of occurrence of troubles such as cutting again, and it has been difficult to secure strength exceeding the tape base material. Further, a technique for ultrasonically welding the formation and bonding of these inclined surfaces is described. However, in this method, it takes time and effort to remove burrs and the like generated during welding, and the dimensional stability is poor. There has been a decisive problem that the requirement for stable operation of the electronic component mounting automatic machine cannot be obtained with dimensional accuracy such as three pitches of perforations.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve these conventional problems, to provide a simple connection method, good dimensional accuracy and good tape sealing properties, and a connection strength. And to provide a carrier tape and a method of connecting the carrier tape which are economically advantageous.

[0005]

Means for Solving the Problems The present inventors have conducted various studies on an effective connection method for a request for cutting or lengthening when the carrier tape is cut or when the tape molding is defective. In order to obtain a physical strength equal to or higher than that of the tape base material, welding of the base material resin is most appropriate and reliable. Ultrasonic welding is most suitable as a partial heating means that does not affect the pockets on both sides of the connection part in this welding. Easy and easy cutting of the tape connection end. The dimensional accuracy after connecting the tape is accurate and reliable. The sealing and peeling of the cover material should not interfere with the connection of the tape. The connection is made by using a connecting jig that has the same dimensions and shape as the carrier tape, and has a manifold part for storing excess resin of the tape base material at the time of welding. Precise dimensional accuracy by setting the most suitable ultrasonic welding conditions using a connection jig that is structured to absorb the amount of resin that overlaps the overlap margin and maintain the thickness accuracy of the seal flange It has been found that a carrier tape having a connection strength can be easily obtained while ensuring the above, and the present invention has been completed.

Hereinafter, a detailed description will be given with reference to the drawings. As shown in FIG. 2, the carrier tape according to the present invention is characterized in that a resin reservoir 5 is formed and connected to the tape connecting portion aa '. The connecting end 6 of each tape shown in FIG. 3 need only be cut at a right angle to the tape flow direction, and does not require a complicated technique, but is simple in order to make the overlapping margin as uniform as possible. It is desirable to use a cutting jig (not shown) or machine cutting. The overlapping margin 9 (FIG. 5) of the tape end for this welding connection is set to be 5% or more and 95% or less of the dimension of the flat portion 7 between the molding pockets 1. Basically, there is a shortage of volume, and it is difficult to secure the strength of the connection part.
This is because instability occurs in absorption into the tape 1. The overlapping margin is preferably set to 10 to 30% of the dimension 7 of the flat part, and the flat part 8 at the end of the tape to be connected is further required. When the size is set to 55 to 65% of the size of the flat portion 7, stability is higher including simplicity of the cutting process.

A connecting jig 10 for welding these tapes has a tape housing pocket 12 of the same shape and dimensions to which the carrier tape to be connected can be fitted as tightly as possible.
It is essential to ensure that a plurality of connection end moldings 1 can be fitted in each other in order to ensure dimensional stability after connection, and the same as the molding pocket width b in the welded portion. This is a jig having a manifold 11 having a width. This manifold 11 has a meaning to absorb the amount of resin sticking out at the time of welding of the connection welding portion 9, to secure a predetermined thickness, and not to affect the deformation and dimensional stability of the molding pockets on both sides. is there. If the end of the tape is simply welded in the absence of the manifold portion 11, the resin of the tape welded portion 9 escapes in four directions, front, rear, left and right, causing burrs on the appearance, and near the pocket forming portion, especially in the center portion. Molding pocket 1 is deformed,
In terms of dimensions, there is a deviation in dimensions that cannot be applied to an electronic component mounting automatic machine.

On the other hand, as the heating means, when the ultrasonic horn 14 is applied to the portion for partial welding and oscillates, the peripheral portion of the welded portion of the tape fitted to the welding jig is pressed to prevent the tape from floating. Is desirable. As a method of preventing the floating, it is also effective to fix the connection jig by vacuum suction d from the back surface 13 of the connection jig. Connection jig 10
Of the tape end welded part 9 has the same volume as the apparent volume of one of the tape end welded parts ± 10%.
Good results can be obtained within the range. As long as the shape of the manifold 11 satisfies the above-mentioned conditions, any shape such as a mesh shape, a lattice shape, a double-row shape, etc. may be used.
Most standardly, the single groove method (FIG. 4) is advantageous in terms of processing.

After the welding, some burrs are formed on the end of the tape other than the manifold portion, but they are extremely small and negligible as compared with the conventional method. When welding the tape, it is desirable that the ultrasonic horn be pressed and oscillated from the top side c of the tape to weld the tape in order to obtain the smoothness of the sealing surface of the cover material 4. However, it is very difficult to press and oscillate from the back of the tape, and the ultrasonic horn may touch the pocket 1 and make a hole. Has to be reduced to a small size, so that stress diffusion cannot be achieved, the welding conditions become very narrow, and it becomes difficult to control it realistically.

[0010]

EXAMPLES The present invention will be described in detail with reference to examples. The measured values of strength and the like in the examples are measured by the following methods.

(Tensile strength) Autograph S manufactured by Shimadzu Corporation
Hold both ends of the sample carrier tape (the cover material is not sealed) using -500 type, and keep 100m between the marked lines.
m, tensile strength was measured at a tensile speed of 50 mm / min, and the breaking strength was measured.

(Peeling strength of cover material) A carrier tape and a cover material are sealed with a sliding seal at 140 ° C., 98 GPa and 32 mm / s using an emboss taping machine manufactured by Nitto Kogyo Co., Ltd., and this is peel back force manufactured by GPD. A peel strength test was performed with a tester at a tensile speed of 300 mm / min and an angle of 180 °.

(Measurement of dimensional accuracy) Dimensions were measured at a magnification of 30 using a tool microscope manufactured by Mitoyo Seisakusho.

(Example 1) A width of 8 mm, a thickness of 0.2 mm,
In order to connect two vinyl chloride carrier tapes with a forming pocket pitch of 4 mm, a flat portion between pockets of 0.8 mm and a pocket width of 3.3 mm at the flat portions between the forming pockets without covering the cover material, Overlap 9 for connection is almost 20% of flat part size 7
The opposite end of the tape was cut so that

Next, as shown in FIG. 3, a pocket 12 capable of accommodating three forming pockets 1 at each tape end is provided, and a connecting pocket portion has a forming pocket width b of 3.3 mm, a width of 0.2 mm and a depth of 0 mm. A tape is tightly fitted into a welding jig 10 having a manifold groove 11 of 2 mm, and an ultrasonic horn of 10 × 40 mm square with a smooth end face is applied to the connection portion from above using a 900 ultrasonic welder manufactured by Branson. Then, the ultrasonic oscillation start pressure was 45 N, the applied pressure was 25 Kpa, the cooling time was 50 minutes, and the lower end position of the horn surface was pressed and oscillated by welding under the condition of absolute distance control of 0.2 mm set from the upper surface of the connection jig. Observation was made on the tensile strength of the welded product, the peel strength of the cover material, the dimensional accuracy, the appearance, and the like, and the results are shown in Table 1.

Comparative Example 1 The carrier tape of Example 1 was welded in the same manner as in Example 1 except that the overlapping margin 9 was set to 0.2 to 0.3 mm using a connection jig having no manifold 11. Connected under conditions. Tensile strength of the connection part of the obtained connection carrier tape, peel strength of the cover material, dimensional accuracy,
The appearance and the like were observed and the results are shown in Table 1.

Comparative Example 2 The carrier tape of Example 1 was fixed to a metal flat surface with an overlapping margin 9 of 0.2 to 0.3 mm, and the end face was smoothed from the back surface (the molded pocket side) of the carrier tape. Ultrasonic horn of 0.7 × 10mm square is applied, ultrasonic transmission start pressure 40N, pressure 20Kp
a, connection was made in a cooling time of 50 minutes. Observation was made on the tensile strength of the connection portion of the obtained connection carrier tape, the peel strength of the cover material, the dimensional accuracy, the appearance, etc., and the results are shown in Table 1.

Comparative Example 3 The connection end faces of the carrier tape of Example 1 were cut so as to face each other at an angle of 45 ° in the thickness direction, and were connected using tetrahydrofuran as an adhesive. Observation was made on the tensile strength of the connection part of the obtained carrier tape, the peel strength of the cover material, the dimensional accuracy, the appearance and the like, and the results are shown in Table 1.

[0019]

[Table 1]

Example 2 24 mm wide and 0.3 m thick
m, pocket pocket pitch 12 mm, flat part dimension between pockets 1.05 mm, two vinyl chloride carrier tapes with a pocket width of 18.5 mm are connected at the flat part between the molding pockets without covering the cover material. The opposite ends of the tape were cut so that the overlapping margin 9 for connection was approximately 20% of the flat portion dimension 7.

Next, as shown in FIG. 3, a pocket 12 capable of accommodating three molding pockets 1 at each tape end is provided, and a molding pocket width b of 18.5 mm is provided at the connection portion.
A tape is tightly fitted to a welding jig 10 having a manifold groove 11 having a width of 0.4 mm and a depth of 0.25 mm, and a 10 × 40 mm square having a smooth end face at a connection portion using an ultrasonic welder 900 model manufactured by Branson. The ultrasonic horn is applied from above, the ultrasonic oscillation start pressure 45N, the applied pressure 30Kpa, the cooling time 50 minutes, and the lower end position of the horn surface under the condition of the absolute distance control of 0.3 mm set from the upper surface of the connection jig. Pressing, oscillating and welding. Observation was made on the tensile strength of the welded product, the peel strength of the cover material, dimensional stability, appearance, and the like. The results are shown in Table 2.

Comparative Example 4 The carrier tape of Example 2 was welded in the same manner as in Example 2 except that the overlapping margin 9 was set to 0.2 to 0.3 mm using a connection jig without the manifold 11. Connected under conditions. Tensile strength of the connection part of the obtained connection carrier tape, peel strength of the cover material, dimensional accuracy,
The appearance and the like were observed, and the results are shown in Table 2.

Comparative Example 5 The carrier tape of Example 2 was fixed on a metal flat surface with an overlapping margin 9 of 0.2 to 0.3 mm, and the rear face of the carrier tape (the molded pocket side) was an end face. Apply a smooth ultrasonic horn of 0.8 × 28mm square, ultrasonic transmission start pressure 45N, pressure 25Kp
a, connection was made in a cooling time of 100 minutes. Observation was made on the tensile strength of the connection portion of the obtained connection carrier tape, the peel strength of the cover material, the dimensional stability, the appearance, and the like, and the results are shown in Table 2.

Comparative Example 6 The connection end faces of the carrier tape of Example 2 were cut so as to face each other at an angle of 45 ° in the thickness direction, and were connected using tetrahydrofuran as an adhesive. Observation was made on the tensile strength of the connection part of the obtained carrier tape, the peel strength of the cover material, the dimensional stability, the appearance and the like, and the results are shown in Table 2.

[0025]

[Table 2]

[0026]

According to the present invention, at the time of connection of the carrier tape, the same performance as that of the non-connection portion is secured in all of the tensile strength of the connection portion, the peel strength (sealability) of the cover material, dimensional stability, appearance, etc. Can be easily performed, and when connection is required, it can be easily and quickly responded. or,
In the past, molding failures that occurred during molding of carrier tape, etc., were all considered to have a defective yield in one roll. However, according to the present invention, it is possible to cut out only the molding defective portion and perform a welding process, thereby improving the yield. It is easy to respond to the demand for a longer carrier tape, which is indispensable for improving the efficiency of continuous operation of an automatic machine for mounting electronic components.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a series of a carrier tape according to the present invention.

FIG. 2 is an enlarged sectional view and a rear plan view showing a state of a carrier tape connecting portion according to the present invention.

FIG. 3 is an enlarged cross-sectional view showing an operation procedure when a carrier tape is connected.

FIG. 4 is a perspective view showing an example of the connection jig of the present invention.

FIG. 5 is an explanatory view of a carrier tape connection end of the present invention.

FIGS. 6D and 6E are enlarged cross-sectional views showing a connection portion obtained by a conventional connection method.

Claims (3)

(57) [Claims] 1. A connection portion of a tape is connected by welding at a portion of a non-molded flat portion between pocket molding portions, and a width of a molding pocket is provided on a back surface of the connection portion, which is smaller than a width of the flat portion. A carrier tape that is welded in a state where a narrow resin pool is formed. 2. A connection jig having the same size and shape as the carrier tape and having a manifold portion for storing the outflow due to welding of the resin of the tape base material at the connection portion of the non-molded flat portion. The overlap of the ends of the tapes is more than 5% of the dimension of the non-molded flat part,
%, And the resin is welded while absorbing the protruding resin at the overlapping portion of the tape at the welding connection part by the manifold part of the connection jig. 3. The method for connecting a carrier tape according to claim 2, wherein the welding of the tape is performed by ultrasonic welding.