JP3022476B2 - Lead protection tape and lead frame for measuring adhesive strength - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead protection tape for fixing leads provided on a lead frame of a semiconductor device and a lead frame having the lead protection tape, and more particularly to a dummy tape for measuring adhesive strength. And a lead frame having the lead protection tape.

[0002]

2. Description of the Related Art Conventionally, in products having long leads, especially flat packages having a fine lead width and fine pitch, the leads may bend by a slight impact, or the leads may be "disintegrated" in a process such as sorting. Was. For this reason, a tape for fixing the lead, that is, a lead protection tape has been used to prevent the lead from "scattering", and the lead has been fixed by thermocompression bonding or the like.

However, the adhesive strength of the lead protection tape to the leads (hereinafter referred to as "tape adhesive strength") is not always uniform, and it is necessary to measure the adhesive strength. Usually, such a method of measuring the adhesive strength of the tape has been taken by using a dedicated package for measuring the adhesive strength of the tape. However, this method has a problem in that a package different from a product is used, so that it cannot be said that the lot is completely represented. Further, there is a problem that even if an attempt is made to use an actual package, it is not practical in a fine pitch case.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned problems, and one of the objects thereof is to perform completely random sampling and to measure the adhesive strength of a tape. An object of the present invention is to provide a lead protection tape which can be measured at any time and a lead frame having the lead protection tape. It is another object of the present invention to provide a lead protection tape and a lead frame having the lead protection tape, which can easily measure the adhesive strength of the tape.

[0005]

Means for Solving the Problems The present inventors have developed a. Easy measurement of tape adhesive strength, b. No special jig for strength measurement is required. The present invention has been completed by examining the configurations of the lead protection tape and the lead frame from the viewpoint that sampling can be performed when measurement is desired. That is, the lead protection tape according to the present invention is characterized in that in the lead protection tape for fixing the leads provided on the lead frame, at least one or more dummy tapes for measuring the adhesive strength are provided on the lead protection tape. (Claim 1), and at least one dummy tape for measuring the adhesive strength is attached to an end of the lead protection tape. What we have done "
(Claim 2) ・ “At least one or more dummy tapes for measuring the adhesive strength are provided at both ends of the lead protection tape”
(Claim 3), "The dummy tape for measuring the adhesive strength is connected to the end of the lead protection tape via an easy-cutting portion" (Claim 4),-"The easy-cutting portion Has a cut or notch "(claim 5), the dummy tape can be easily separated from the end of the lead protection tape, and the tape adhesion strength can be measured without being affected by the end of the lead protection tape. Can be performed.

[0006] The lead frame according to the present invention comprises:
"A lead frame provided with a lead protection tape for fixing leads, comprising a lead protection tape provided with at least one or more dummy tapes for measuring adhesive strength." Item 6) is the gist (items specifying the invention), "The dummy tape for measuring the adhesive strength is arranged at the corner of the lead frame" (Claim 7), "The adhesive strength" One or two dummy tapes for measurement are arranged at each corner of the lead frame "(claim 8), whereby sampling measurement can be performed when measurement is desired.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a lead which can easily measure the adhesive strength of a lead protection tape which is a tape for fixing the lead whenever it is desired to measure the adhesive strength of the tape by completely random sampling. A protection tape and a lead frame having the lead protection tape. That is, the lead protection tape of the present invention is provided with a dummy tape (hereinafter simply referred to as “dummy tape”) for measuring the adhesive strength at an end thereof, and a lead having the lead protection tape. It is a frame.

[0008] The lead protection tape is an insulating tape,
It is made of a synthetic resin such as polyimide, and has a thickness of about 300 μm. Lead protection tape includes
At least one dummy tape is provided at the end or at a place other than the end. The lead protection tape is preferably provided with at least one dummy tape at its end. In addition, at least one dummy tape may be provided at both ends of the lead protection tape.

The dummy tape is preferably provided at an end of the lead protection tape, but is preferably provided via an easy-to-cut portion. The easy-to-cut portion is formed by making a cut or providing notches at both ends of the cut portion.

The lead frame has at least one or more dummy tapes for measuring adhesive strength at an end or at a place other than the end, and has a lead protection tape for fixing leads. The lead frame preferably has a lead protection tape for fixing the leads, provided with at least one or more dummy tapes for measuring the adhesive strength at the ends. The lead frame preferably has a dummy lead at a corner thereof for attaching a dummy tape provided at an end of the lead. The dummy leads to which the dummy tape is adhered may be arranged one by one at each corner of the lead frame. Of course, the number of dummy leads arranged at the corners of the lead frame is limited to four. The number is not limited to one and may be any number as long as it is one or more.
Preferably, the number is four or eight. The dummy read is
In order to measure the adhesive strength of the tape, it is preferable that the space between the leads is slightly widened. Of course, the dummy lead may be provided at a portion other than the corner portion of the lead frame, but is preferably provided at the corner portion of the lead frame.

The dummy tape provided on the lead protection tape is bonded to the dummy lead provided on the lead frame. The bonding is performed in the same manner as when the lead protection tape is bonded to the lead. It is adhered by an adhesive or the like. The outer peripheral portion of the lead frame including the corner where the dummy lead to which the dummy tape is attached is provided is cut when used as a product.

[0012]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of the lead frame 1, and FIG. 2 is an enlarged detailed view of a portion A of FIG. 1 and measures the adhesive strength when the lead protection tape of the present invention is used. It is a figure explaining a means. FIG.
(A) is a figure which shows the state before the dummy tape 4 for adhesive strength measurement is cut | disconnected from the lead protection tape 3,
FIG. 2B is a diagram showing a state after the dummy tape 4 has been cut from the lead protection tape 3, and FIG.
FIG. 4 is a diagram showing a state where a hook 7 is hooked on the dummy tape 4 in order to measure a lead adhesive strength of the dummy tape 4.

As shown in FIG. 1, the lead protection tape 3 fixes the leads 2 and has both ends of the lead frame 1.
, And one dummy tape 4 is provided at one end. The dummy tape 4 is shown in FIG.
As shown in (a), it is connected to the lead protection tape 3 via an easy-to-cut portion 5 with a cut.

As shown in FIGS. 2 (a) to 2 (c), the dummy tape 4 is formed by a known means similar to that used when the lead protection tape 3 is bonded to the leads 2. Are adhered to the dummy leads 6 provided at the corners. The dummy leads 6 are provided slightly wider between the leads for measuring the adhesive strength of the tape.

Next, regarding the measurement of the tape adhesive strength, FIG.
This will be described with reference to (a) to (c). As shown in FIG. 2A, the dummy tape 4 connected to the lead protection tape 3 via the easy-to-cut portion 5 is disposed at a corner of the lead frame 1, and the dummy tape 4
Is cut from the easy cutting portion 5 connected to the lead protection tape 3 as shown in FIG.
Cutting is performed using a cutting tool such as a cutter. Needless to say, even when the cut portion 5 is not provided with a cut or the like, the cut is similarly performed using a cutting tool such as a cutter.

Then, as shown in FIG. 2C, a hook 7 of a tensile strength measuring jig is hung on the cut dummy tape 4 bonded to the dummy lead 6 provided at the corner. And pull it in the direction of the arrow until it peels off, and measure the adhesive strength.

By simply measuring the bonding strength of the dummy tape 4 in this manner, the bonding strength of the lead protection tape 3 bonded to the lead 2 is measured in the same manner as the bonding of the dummy tape 4 to the dummy lead 6. You can know.

[0018]

As described in detail above, the present invention is characterized in that at least one dummy tape for measuring adhesive strength is provided on a lead protection tape for fixing leads provided on a lead frame. This makes it possible to perform random sampling completely, and to measure the tape adhesive strength whenever it is desired, thereby facilitating the measurement of the tape adhesive strength.

[Brief description of the drawings]

FIG. 1 is a plan view showing a lead frame of the present invention.

FIG. 2 is an enlarged detailed view of a portion A of FIG. 1 and is a view for explaining a means for measuring an adhesive strength when the lead protection tape of the present invention is used, and FIG. It is a figure which shows the state before, (b) shows the state after cutting a dummy tape, and (c) shows the state which hooked the tensile strength measuring jig on the dummy tape after cutting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead frame 2 Lead 3 Lead protection tape 4 Dummy tape 5 Easy cutting part 6 Dummy lead 7 Hook

Claims (8)

(57) [Claims] 1. A lead protection tape for fixing leads provided on a lead frame, wherein at least one dummy tape for measuring adhesive strength is provided on the lead protection tape. . 2. The lead protection tape according to claim 1, wherein at least one dummy tape for measuring the adhesive strength is provided at an end of the lead protection tape. 3. The lead protection tape according to claim 1, wherein at least one or more dummy tapes for measuring the adhesive strength are provided at both ends of the lead protection tape. 4. A dummy tape for measuring the adhesive strength,
The lead protection tape according to any one of claims 1 to 3, wherein the lead protection tape is connected to an end of the lead protection tape via an easy-to-cut portion. 5. The lead protection tape according to claim 4, wherein the easy-to-cut portion has a cut or a notch. 6. A lead frame having a lead protection tape for fixing leads, the lead frame having at least one or more dummy tapes for measuring adhesive strength. 7. The dummy tape for measuring an adhesive strength,
7. The lead frame according to claim 6, wherein the lead frame is arranged at a corner of the lead frame. 8. The dummy tape for measuring the adhesive strength,
The lead frame according to claim 6, wherein one or two lead frames are arranged at each corner portion of the lead frame.