US5250842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor devices using tab tape
Assignee: NEC Corp
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Filing: 1991-09-05
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Granted: 1993-10-05
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Expires: 2011-09-05
Abstract
Abstract In a tape automated bonding (TAB) tape used in a semiconductor device, there is provided at each of the corners of a square opening therein a projection inwards the opening instead of the conventional right angle corner. This projection is left when said opening is cut in the base tape or when metal foil on the base tape is selectively etched. According to the present invention, gap between each corner of the opening and each corner of a semiconductor chip can be reduced in virtue of the above-mentioned projection, this permitting to prevent resin to be applied for coating a semiconductor chip and the inner leads to be bonded to it from dripping through the corner.
Inventors
- 👤 Yukihito Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:46
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/10; H10W74/131; H10W70/00; H10W70/40; H10W70/453; H10W72/00; H10W72/701; H10W74/01
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
170 words
A semiconductor device comprising: a semiconductor chip having a first quadrilateral shape with four corners; a tape carrier including a base tape made of a thin insulating material strip and having an upper surface, said base tape having a device hole formed therein with a second quadrilateral shape having four corner portions of said base tape forming projections extending into said device hole, said second quadrilateral shape being larger than said first quadrilateral shape of said semiconductor chip and said four projections extending far enough into said hole to, respectively, support said four corners of said semiconductor chip, and a plurality of inner leads made of a metal foil attached to said upper surface of said base tape, said inner leads projecting onto said device hole in order to form portions for making connections to said semiconductor chip, said semiconductor chip being electrically connected and mechanically fixed to said connecting portions of said inner leads; and a resin coating said semiconductor chip and said connecting portions of said inner leads.
Claim 2
Dependent Claim
170 words
A semiconductor device comprising: a semiconductor chip having a first quadrilateral shape with four corners; a tape carrier including a base tape made of a thin insulating material strip and having an upper surface, said base tape having a device hole formed therein with a second quadrilateral shape having four corner portions of said base tape forming projections extending into said device hole, said second quadrilateral shape being larger than said first quadrilateral shape of said semiconductor chip and said four projections extending far enough into said hole to, respectively, support said four corners of said semiconductor chip, and a plurality of inner leads made of a metal foil attached to said upper surface of said base tape, said inner leads projecting onto said device hole in order to form portions for making connections to said semiconductor chip, said semiconductor chip being electrically connected and mechanically fixed to said connecting portions of said inner leads; and a resin coating said semiconductor chip and said connecting portions of said inner leads.
Claim 3
Dependent Claim
21 words
A semiconductor device as claimed in claim 1, wherein said thin insulating material strip is made of a polyamide resin strip.
Claim 4
Dependent Claim
16 words
A semiconductor device as claimed in claim 1, wherein said metal foil is made of copper.
Claim 5
Dependent Claim
16 words
A semiconductor device as claimed in claim 1, wherein said coating resin is an epoxy resin.
Claim 6
Dependent Claim
67 words
A tape having at least one opening formed therein for receiving a semiconductor chip, said tape including at least one metal finger extending into said opening for resin bonding to said chip, said tape also including a projection extending into said opening to bridge a gap between said tape and a corner of said chip through which said resin may drip, whereby said projection resists said dripping.
Claim 7
Dependent Claim
67 words
A tape having at least one opening formed therein for receiving a semiconductor chip, said tape including at least one metal finger extending into said opening for resin bonding to said chip, said tape also including a projection extending into said opening to bridge a gap between said tape and a corner of said chip through which said resin may drip, whereby said projection resists said dripping.
Claim 8
Dependent Claim
24 words
The tape of claim 5 wherein said opening has at least one corner which may form said gap and said projection spans said corner.
Claim 9
Dependent Claim
29 words
The tape of claim 5 wherein said opening is rectangular with four corners where gaps may be formed and said projections span each of said gaps at said corners.
Claim 10
Dependent Claim
42 words
The tape of claim 5 wherein said tape includes a base of insulating material with a surface of conductive material in association therewith, said conductive material forming said at least one metal finger and said projection being formed by said insulating material.
Claim 11
Dependent Claim
49 words
The tape of claim 5 wherein said tape includes a base of insulating material with a surface of conductive material in association therewith, said conductive material forming said at least one metal finger, and said projection being formed by a combination of said insulating material and said conductive material.
Claim 12
Dependent Claim
28 words
The tape of any one of the claims 5 to 9 wherein said tape has a plurality of said openings repeated at periodic locations along the length thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-04 | 1997-04-05 | 1997-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-04 | 2001-04-05 | 2001-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-04 | 2005-04-05 | 2005-10-05 | $7700.00 | Window Closed / Lapsed |