Substrate strip with sides having flanges and recesses

Details Substrate strip with sides having flanges and recesses Substrate strip with sides having flanges and recesses

2002-10-10

2004-12-07

Watkins, III, William P. (Department: 1772)

Stock material or miscellaneous articles

Perimeter or corner structure of sheet

C428S131000, C257S685000, C257S782000, C257S787000, C257S666000, C257S670000, C257S712000, C257S722000, C257S730000, C438S110000

Reexamination Certificate

active

06828002

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a substrate strip, particularly to a substrate strip with sides having flanges and recesses.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional substrate strip
1
comprises five die pads
11
,
12
for supporting dice (not shown) to be packaged and five mold gates
13
,
14
extending from an edge of the substrate strip
1
to each of the die pads
11
,
12
for guiding mold compound into the die pads
11
,
12
. A first frame
15
is defined between the die pad
11
and the die pad
12
. A second frame
16
is formed at a lower lateral side of the die pad
11
. A third frame
17
is formed at an upper lateral side of the die pad
11
and near the mold gate
13
. The first frame
15
, the second frame
16
, and the third frame
17
are for positioning and delivering the substrate strip
1
.
Referring to
FIG. 2
, the substrate strip
1
is obtained by cutting a panel
2
. A plurality of substrate strips
1
can be arrayed on the panel
2
and then cut therefrom. Only some fixed sizes are for the panel
2
, and margins should be kept between the substrate strips arrayed, so that the conventional substrate strips cannot be arrayed most densely on the panel
2
to obtain the most substrate strips. Usually, part of the panel is wasted, for example, in a region shown with dotted lines in FIG.
2
.
Therefore, it is necessary to provide an innovative and advanced substrate strip so as to solve the above problem.
SUMMARY OF THE INVENTION
One objective of the present invention is to provide a substrate strip with sides having flanges and recesses. The substrate strip is obtained by cutting a panel where a plurality of substrate strips can be arrayed. The substrate strip comprises a plurality of die pads, a first side, and a second side. The die pads are for supporting dice to be packaged. The first side comprises a plurality of first flanges and a plurality of first recesses defined between the first flanges. The second side comprises a plurality of second flanges and a plurality of second recesses defined between the second flanges. The second flanges are formed in the locations corresponding to the first recesses, and the second recesses are formed in locations corresponding to the first flanges. The complementary shapes of the first side and the second side are suitable for arraying the two substrate strips most closely, and the most substrate strips can be arrayed most densely. Accordingly, the most substrate strips can be cut from the panel, and waste of the panel can be avoided. The cost of the panel is enormously slashed and the total cost of manufacture is reduced thereby.


REFERENCES:
patent: 5886398 (1999-03-01), Low et al.
patent: 6013947 (2000-01-01), Lim

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