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US5844782A Expired / Lapsed US ⏱️ 0.0 years remaining

Printed wiring board and electronic device using same

Assignee: Sony Corp
•
Filing: 1996-03-29
•
Granted: 1998-12-01
•
Expires: 2016-03-29
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Abstract

Abstract A printed wiring board and an electronic device using the same with which the formation of cracks in base portions of projecting external electrodes formed on lands on the printed wiring,board is certainly prevented. With respect to a printed wiring board 11 having lands 16 formed in a wiring pattern where external electrodes 13 are to be formed and a pattern-protecting film 17 having openings 17a where the external electrodes 13 are to be formed, the opening diameter D1 of the openings 17a in the pattern-protecting film 17 is set greater by a predetermined dimension than the external diameter D2 of the lands 16 and a gap is thereby provided between each of the external electrodes 13 and the pattern-protecting film 17 so that the external electrodes 13 and the pattern-protecting film 17 do not make contact with each other and as a result there is no cracking of the external electrodes 13 caused by differential thermal expansion of the external electrodes 13 and the pattern-protecting film 17. An electronic module comprising the electronic device of the invention mounted on a mother board can be widely used by being incorporated into various types of electronic equipment.

Inventors

  • 👤 Hiroyuki Fukasawa

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 10:03
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3452; H10; H10W; H10W70/00; H10W70/60; H10W70/62; H10W70/65; H10W90/00; H10W90/701; H05K1/00; H05K1/02; H05K1/0201; H05K2201/00; H05K2201/06; H05K2201/062; H05K2201/09; H05K2201/09818; H05K2201/0989; H05K2201/10; H05K2201/10613; H05K2201/10621; H05K2201/10734; H05K2201/10954; H05K2201/10969; H05K3/341; H05K3/3431; H10W72/00; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W74/00; H10W90/751; H10W90/754

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 60 words
A printed wiring board comprising a land formed on a first side of the wiring board and a pattern-protecting film formed on the first side wherein there is a gap between the pattern protecting film and the land and further wherein the pattern protecting film is at least substantially uniformly spaced apart from and at least substantially surrounding the land.
Claim 2
Dependent Claim 60 words
A printed wiring board comprising a land formed on a first side of the wiring board and a pattern-protecting film formed on the first side wherein there is a gap between the pattern protecting film and the land and further wherein the pattern protecting film is at least substantially uniformly spaced apart from and at least substantially surrounding the land.
Claim 3
Dependent Claim 21 words
A printed wiring board according to claim 1 wherein: a wiring pattern and the land are connected by a connecting pattern.
Claim 4
Dependent Claim 65 words
An electronic device comprising: a printed wiring board having a land formed on a first side of the board and a pattern protecting film formed on the first side of the board with a gap between the land and the pattern protecting film and further wherein the pattern protecting film is at least substantially uniformly spaced apart from and at least substantially surrounding the land.
Claim 5
Dependent Claim 65 words
An electronic device comprising: a printed wiring board having a land formed on a first side of the board and a pattern protecting film formed on the first side of the board with a gap between the land and the pattern protecting film and further wherein the pattern protecting film is at least substantially uniformly spaced apart from and at least substantially surrounding the land.
Claim 6
Dependent Claim 20 words
An electronic device according to claim 3, wherein: the wiring pattern and the land are connected by a connecting pattern.
Claim 7
Dependent Claim 72 words
An electronic device comprising: an electronic component mounted on a first side of a board; a land formed on a second side of the board and a pattern protecting film formed on the second side of the board with a gap between from the land and the pattern protecting film and further wherein the pattern protecting film is at least substantially uniformly spaced apart from and at least substantially surrounding the land.
Claim 8
Dependent Claim 72 words
An electronic device comprising: an electronic component mounted on a first side of a board; a land formed on a second side of the board and a pattern protecting film formed on the second side of the board with a gap between from the land and the pattern protecting film and further wherein the pattern protecting film is at least substantially uniformly spaced apart from and at least substantially surrounding the land.
Claim 9
Dependent Claim 20 words
An electronic module according to claim 5, wherein the wiring pattern and the land are connected by a connecting pattern.

References Cited (Backward Citations)

US4263606A Cited
US4970571A Cited
US5378859A Cited
US5637832A Cited
US5539153A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2001-11-30 2002-06-01 2002-12-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2005-11-30 2006-06-01 2006-12-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2009-11-30 2010-06-01 2010-12-01 $7700.00 Window Closed / Lapsed

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