US5229638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated circuit lead frame having Z-shape step portion
Assignee: Seiko Epson Corp
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Filing: 1991-10-16
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Granted: 1993-07-20
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Expires: 2011-10-16
Abstract
Abstract Disclosed is an integrated circuit lead frame which comprises: a die-pad; die-pad suspension leads for supporting the die-pad; a number of inner leads provided around the die-pad so as to be separated from the die-pad at a predetermined distance, and connected through wires with electrodes of an integrated circuit fixed onto the die-pad; wherein a step portion having a sharp corner portion is provided in at least one portion of the lead frame. Further disclosed is a method of producing such an integrated circuit lead frame as mentioned above, wherein a portion between one of the die-pad suspension leads and one of the inner leads adjacent to the one die-pad suspension lead is stamped out through two or more steps to thereby form a step portion having a sharp corner portion in a side portion of the one die-pad suspension lead or the one inner lead. Thus, since the step portion is formed through two or more steps, the step portion may have an corner portion which is sharp and which has no shear drop so that it is possible for an image recognition apparatus to recongnize the step portion accurately and rapidly to thereby perform the recognition with no error.
Inventors
- 👤 Yuji Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:23
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/421; B; B82; B82Y; B82Y10/00; H10W46/00; H10W70/01; H10W70/04; H10W70/048; H10W70/411; H10W72/00; H10W72/50; H10W46/601; H10W72/541; H10W72/5449; H10W72/551; H10W72/552; H10W72/90; H10W72/931; H10W72/932; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
118 words
An integrated circuit lead frame comprising: a frame defining an opening; a die-pad in said opening for receiving an integrated circuit; die-pad suspension leads for supporting said die-pad from said frame; a number of inner leads projecting from said frame toward said die-pad so as to have respective top ends separated from said die-pad at a predetermined distance for connection through wires with electrodes of the integrated circuit on said die-pad, whereby some of said inner leads are adjacent to said die-pad suspension leads; and step portion means having a single Z shape defining a single sharp corner in at least one of said frame, die-pad, die-pad suspension leads, and inner leads for alignment with the integrated circuit.
Claim 2
Dependent Claim
118 words
An integrated circuit lead frame comprising: a frame defining an opening; a die-pad in said opening for receiving an integrated circuit; die-pad suspension leads for supporting said die-pad from said frame; a number of inner leads projecting from said frame toward said die-pad so as to have respective top ends separated from said die-pad at a predetermined distance for connection through wires with electrodes of the integrated circuit on said die-pad, whereby some of said inner leads are adjacent to said die-pad suspension leads; and step portion means having a single Z shape defining a single sharp corner in at least one of said frame, die-pad, die-pad suspension leads, and inner leads for alignment with the integrated circuit.
Claim 3
Dependent Claim
39 words
The integrated circuit lead frame according to claim 1, in which said step portion means is in at least one of said die-pad suspension leads and one of said inner leads adjacent to one of said die-pad suspension leads.
Claim 4
Dependent Claim
42 words
The integrated circuit lead frame according to claim 1, in which said step portion means is provided only in two of opposite ones of one of said die-pad suspension leads or ones of said inner leads adjacent to said die-pad suspension leads.
Claim 5
Dependent Claim
119 words
An integrated circuit lead frame comprising: a frame defining an opening; a die-pad in said opening for receiving an integrated circuit; die-pad suspension leads for supporting said die-pad from said frame; a number of inner leads projecting from said frame toward said die-pad so as to have respective top ends separated from said die-pad at a predetermined distance for connection through wires with electrodes of the integrated circuit on said die-pad, whereby some of said inner leads are adjacent to said die-pad suspension leads; and step portion means having a Z shape defining a sharp corner in a side edge at least one of said frame, die-pad, die-pad suspension leads, and inner leads for alignment with the integrated circuit.
Claim 6
Dependent Claim
119 words
An integrated circuit lead frame comprising: a frame defining an opening; a die-pad in said opening for receiving an integrated circuit; die-pad suspension leads for supporting said die-pad from said frame; a number of inner leads projecting from said frame toward said die-pad so as to have respective top ends separated from said die-pad at a predetermined distance for connection through wires with electrodes of the integrated circuit on said die-pad, whereby some of said inner leads are adjacent to said die-pad suspension leads; and step portion means having a Z shape defining a sharp corner in a side edge at least one of said frame, die-pad, die-pad suspension leads, and inner leads for alignment with the integrated circuit.
Claim 7
Dependent Claim
42 words
The integrated circuit lead frame according to claim 4, in which said step portion means is provided only in two of opposite ones of one of said die-pad suspension leads or ones of said inner leads adjacent to said die-pad suspension leads.
Claim 8
Dependent Claim
28 words
The integrated circuit lead frame according to claim 4, wherein said step portion means are at said top end of at least one of said inner lead frames.
Claim 9
Dependent Claim
42 words
The integrated circuit lead frame according to claim 6, in which said step portion means is provided only in two of opposite ones of one of said die-pad suspension leads or ones of said inner leads adjacent to said die-pad suspension leads.
Claim 10
Dependent Claim
26 words
The integrated circuit lead frame according to claim 4, wherein each of said step portion means comprises a single Z shape defining a single sharp corner.
Claim 11
Dependent Claim
26 words
The integrated circuit lead frame according to claim 5, wherein each of said step portion means comprises a single Z shape defining a single sharp corner.
Claim 12
Dependent Claim
26 words
The integrated circuit lead frame according to claim 6, wherein each of said step portion means comprises a single Z shape defining a single sharp corner.
Claim 13
Dependent Claim
26 words
The integrated circuit lead frame according to claim 7, wherein each of said step portion means comprises a single Z shape defining a single sharp corner.
References Cited (Backward Citations)
US4513355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |