Patent US5043526A successfully refreshed from Google Patents.
US5043526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit board capable of preventing electromagnetic interference
Assignee: Nintendo Co Ltd
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Filing: 1990-02-22
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Granted: 1991-08-27
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Expires: 2010-02-22
Abstract
Abstract A printed circuit board includes a first electric conductive layer formed on an insulating base plate to form signal patterns and a ground pattern. An insulation layer covering the signal patterns and a second electric conductive layer connected to the ground pattern are sequentially formed on the plate. A large area ground land is formed in the vicinity of a ground terminal of a digital IC by the first electric conductive layer to be connected to the ground terminal, which is directly surface-mounted to the second electric conductive layer so that a ground impedance of the ground terminal can be reduced. A large area power source land connected to a power source terminal of the digital IC is formed in the vicinity of the power source terminal by the first electric conductive layer, which sandwiches the insulation layer in cooperation with the second electrostatic conductive layer so that an electrostatic capacitance larger than a line-to-line distribution capacitance formed by the signal patterns can be formed between the power source land and the second electric conductive layer.
Inventors
- 👤 Katsuya Nakagawa
- 👤 Masakazu Nagano
- 👤 Jun Higashiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:21
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/002; H05K9/0039; H05K1/00; H05K1/02; H05K1/0213; H05K1/0216; H05K1/0218; H05K1/09; H05K1/092; H05K1/095; H05K2201/00; H05K2201/07; H05K2201/0707; H05K2201/0715; H05K2203/00; H05K2203/04; H05K2203/044; H05K2203/07; H05K2203/0703; H05K2203/0723; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3468; H05K3/46; H05K3/4644
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
419 words
A printed circuit board capable of preventing electromagnetic interference, comprising: an insulating base plate; a first electrically conductive layer formed on said insulating base plate, said first electrically conductive layer forming a signal pattern and a ground pattern; an insulating layer formed on said insulating base plate so as to cover at least said signal pattern; a second electrically conductive layer formed on said insulating layer and electrically connected to said ground pattern; at least one region for receiving, in use, a digital IC, and having a power source terminal receiving region, and a ground terminal receiving region; a large area ground land formed in the vicinity of said ground terminal receiving region by said first electrically conductive layer and connected to said ground terminal receiving region, said ground land being directly surface-connected to said second electrically conductive layer so that a ground impedance of said ground terminal of said digital IC can be reduced; said printed circuit board further including a large area power source land formed in the vicinity of said power source terminal receiving region of said digital IC by said first electrically conductive layer and connected to said power source terminal receiving region, said power source land being opposite to said second electrically conductive layer so as to sandwich said insulating layer so that an electrostatic capacitance larger than a line-to-line distributed capacitance formed by said signal pattern can be formed between said power source land and said second electrically conductive layer; said printed circuit board further including a region for receiving, in use, an electrical connector, and having a connector ground terminal receiving region and at least one other terminal receiving region, said printed circuit board further including a large area further ground land formed in the vicinity of said connector ground terminal receiving region and connected to said connector ground terminal receiving region by said first electrically conductive layer, said further ground land being directly surface-connected to said second electrically conductive layer so that a ground impedance of said ground terminal of said connector can be reduced, said printed circuit board further including a large area capacitance land formed in the vicinity of said other terminal receiving region and connected to said other terminal receiving region, said capacitance land being opposite to said second electrically conductive layer so as to sandwich said insulating layer so that an electrostatic capacitance larger than a line-to-line distributed capacitance formed by said signal pattern can be formed between said capacitance land and said second electrically conductive layer.
Claim 2
Dependent Claim
419 words
A printed circuit board capable of preventing electromagnetic interference, comprising: an insulating base plate; a first electrically conductive layer formed on said insulating base plate, said first electrically conductive layer forming a signal pattern and a ground pattern; an insulating layer formed on said insulating base plate so as to cover at least said signal pattern; a second electrically conductive layer formed on said insulating layer and electrically connected to said ground pattern; at least one region for receiving, in use, a digital IC, and having a power source terminal receiving region, and a ground terminal receiving region; a large area ground land formed in the vicinity of said ground terminal receiving region by said first electrically conductive layer and connected to said ground terminal receiving region, said ground land being directly surface-connected to said second electrically conductive layer so that a ground impedance of said ground terminal of said digital IC can be reduced; said printed circuit board further including a large area power source land formed in the vicinity of said power source terminal receiving region of said digital IC by said first electrically conductive layer and connected to said power source terminal receiving region, said power source land being opposite to said second electrically conductive layer so as to sandwich said insulating layer so that an electrostatic capacitance larger than a line-to-line distributed capacitance formed by said signal pattern can be formed between said power source land and said second electrically conductive layer; said printed circuit board further including a region for receiving, in use, an electrical connector, and having a connector ground terminal receiving region and at least one other terminal receiving region, said printed circuit board further including a large area further ground land formed in the vicinity of said connector ground terminal receiving region and connected to said connector ground terminal receiving region by said first electrically conductive layer, said further ground land being directly surface-connected to said second electrically conductive layer so that a ground impedance of said ground terminal of said connector can be reduced, said printed circuit board further including a large area capacitance land formed in the vicinity of said other terminal receiving region and connected to said other terminal receiving region, said capacitance land being opposite to said second electrically conductive layer so as to sandwich said insulating layer so that an electrostatic capacitance larger than a line-to-line distributed capacitance formed by said signal pattern can be formed between said capacitance land and said second electrically conductive layer.
Claim 3
Dependent Claim
334 words
A printed circuit board capable of preventing electromagnetic interference, comprising: an insulating base plate; a first electrically conductive layer formed on said insulating base plate, said first electrically conductive layer forming a signal pattern and a ground pattern; an insulating layer formed on said insulating base plate so as to cover at least said signal pattern; a second electrically conductive layer formed on said insulating layer and electrically connected to said ground pattern; at least one region for receiving, in use, a digital IC and having a power source terminal receiving region, and a ground terminal receiving region; a large area ground land formed in the vicinity of said ground terminal receiving region by said first electrically conductive layer and connected to said ground terminal receiving region, said ground land being directly surface-connected to said second electrically conductive layer so that a ground impedance of said ground terminal of said digital IC can be reduced; said printed circuit board further including a region for receiving, in use, an electrical connector, and having a connector ground terminal receiving region and at least one other terminal receiving region, said printed circuit board further including a large area further ground land formed in the vicinity of said connector ground terminal receiving region of said connector and connected to said connector ground terminal receiving region by said first electrically conductive layer, said further ground land being directly surface-connected to said second electrically conductive layer so that a ground impedance of said ground terminal of said connector can be reduced, said printed circuit board, further including a large area capacitance land formed in the vicinity of said other terminal receiving region of said connector and connected to said other terminal receiving region, said capacitance land being opposite to said second electrically conductive layer so as to sandwich said insulating layer so that an electrostatic capacitance larger than a line-to-line distributed capacitance formed by said signal pattern can be formed between said capacitance land and said second electrically conductive layer.
Claim 4
Dependent Claim
334 words
A printed circuit board capable of preventing electromagnetic interference, comprising: an insulating base plate; a first electrically conductive layer formed on said insulating base plate, said first electrically conductive layer forming a signal pattern and a ground pattern; an insulating layer formed on said insulating base plate so as to cover at least said signal pattern; a second electrically conductive layer formed on said insulating layer and electrically connected to said ground pattern; at least one region for receiving, in use, a digital IC and having a power source terminal receiving region, and a ground terminal receiving region; a large area ground land formed in the vicinity of said ground terminal receiving region by said first electrically conductive layer and connected to said ground terminal receiving region, said ground land being directly surface-connected to said second electrically conductive layer so that a ground impedance of said ground terminal of said digital IC can be reduced; said printed circuit board further including a region for receiving, in use, an electrical connector, and having a connector ground terminal receiving region and at least one other terminal receiving region, said printed circuit board further including a large area further ground land formed in the vicinity of said connector ground terminal receiving region of said connector and connected to said connector ground terminal receiving region by said first electrically conductive layer, said further ground land being directly surface-connected to said second electrically conductive layer so that a ground impedance of said ground terminal of said connector can be reduced, said printed circuit board, further including a large area capacitance land formed in the vicinity of said other terminal receiving region of said connector and connected to said other terminal receiving region, said capacitance land being opposite to said second electrically conductive layer so as to sandwich said insulating layer so that an electrostatic capacitance larger than a line-to-line distributed capacitance formed by said signal pattern can be formed between said capacitance land and said second electrically conductive layer.
Claim 5
Dependent Claim
175 words
A printed circuit board capable of preventing electromagnetic interference, comprising: an insulating base plate; a first electrically conductive layer formed on said insulating base plate, said first electrically conductive layer forming a signal pattern and a ground pattern; an insulating layer formed on said insulating base plate so as to cover at least said signal pattern; a second electrically conductive layer formed on said insulating layer and electrically connected to said ground pattern; at least one region for connection, in use, with an electrical component having at least one signal receiving terminal, said region having at least one signal receiving terminal region; and a large area capacitance land formed in the vicinity of said signal receiving terminal region associated with said electrical component and connected to said signal receiving terminal region, said capacitance land being opposite to said second electrically conductive layer so as to sandwich said insulating layer to form an electrostatic capacitance, larger than a line-to-line distributed capacitance formed by said signal pattern, between said capacitance land and said second electrically conductive layer.
Claim 6
Dependent Claim
175 words
A printed circuit board capable of preventing electromagnetic interference, comprising: an insulating base plate; a first electrically conductive layer formed on said insulating base plate, said first electrically conductive layer forming a signal pattern and a ground pattern; an insulating layer formed on said insulating base plate so as to cover at least said signal pattern; a second electrically conductive layer formed on said insulating layer and electrically connected to said ground pattern; at least one region for connection, in use, with an electrical component having at least one signal receiving terminal, said region having at least one signal receiving terminal region; and a large area capacitance land formed in the vicinity of said signal receiving terminal region associated with said electrical component and connected to said signal receiving terminal region, said capacitance land being opposite to said second electrically conductive layer so as to sandwich said insulating layer to form an electrostatic capacitance, larger than a line-to-line distributed capacitance formed by said signal pattern, between said capacitance land and said second electrically conductive layer.
Claim 7
Dependent Claim
44 words
A printed circuit board capable of preventing electromagnetic interference in accordance with claim 3, wherein said electrostatic capacitance is connected to the ground formed by said second conductive layer to function as a by-pass capacitance for said signal receiving terminal of said electrical component.
Claim 8
Dependent Claim
27 words
A printed circuit board capable of preventing electromagnetic interference in accordance with claim 4, wherein said electrical component includes a component which operates in a high-frequency region.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |