US5270488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shield construction for electrical devices
Assignee: Mitsubishi Electric Corp
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Filing: 1991-07-09
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Granted: 1993-12-14
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Expires: 2011-07-09
Abstract
Abstract A shield construction for electrical devices which comprises a conductive thin film mounted at least one of the surface of electrical devices. The shield construction is connected with ground leads of a electrical devices or the ground plane of the circuit board. The shield construction prevents the radiation of undesired waves from the electrical devices. As a result, the deterioration of the receiving sensitivity and noise generation becomes negligibly small even in the weak electric field area.
Inventors
- 👤 Hideyo Ono
- 👤 Keiji Okabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:45
CPC Classifications
H; H10; H10W; H10W44/00; H10W44/601; H04; H04M; H04M1/00; H04M1/02; H04M1/0202; H04M1/03; H04M1/19; H10W42/00; H10W42/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
A shield construction for shielding an electrical device in a mobile communication apparatus from external electromagnetic interference and for absorbing re-radiation of undesired electromagnetic waves generated by non-linear characteristics of the elements of said electrical device where said electrical device is covered by insulated materials and has a plurality of leads extending therefrom for signal, ground and power supply connections, said shield construction comprising: a conductive material mounted on and extending over at least the major surface of said electrical device, and connecting means connecting said conductive material to the ground potential of said ground leads at a plurality of locations around said conductive material, whereby interfering external electromagnetic waves reaching said electrical device and re-radiated undesired electromagnetic waves generated by non-linear characteristics of the elements of said electrical device are substantially absorbed and connected to ground potential.
Claim 2
Dependent Claim
138 words
A shield construction for shielding an electrical device in a mobile communication apparatus from external electromagnetic interference and for absorbing re-radiation of undesired electromagnetic waves generated by non-linear characteristics of the elements of said electrical device where said electrical device is covered by insulated materials and has a plurality of leads extending therefrom for signal, ground and power supply connections, said shield construction comprising: a conductive material mounted on and extending over at least the major surface of said electrical device, and connecting means connecting said conductive material to the ground potential of said ground leads at a plurality of locations around said conductive material, whereby interfering external electromagnetic waves reaching said electrical device and re-radiated undesired electromagnetic waves generated by non-linear characteristics of the elements of said electrical device are substantially absorbed and connected to ground potential.
Claim 3
Dependent Claim
14 words
The shield construction of claim 1, wherein said conductive material is a conductive film.
Claim 4
Dependent Claim
22 words
The shield construction of claim 1, wherein said conductive material is formed by metal plating on the surface of said electrical device.
Claim 5
Dependent Claim
17 words
The shield construction of claim 1, wherein said conductive material is formed on a flexible plastic film.
Claim 6
Dependent Claim
20 words
The shield construction of claim 1, wherein said conductive material is formed on the surface of the flexible conductive sheet.
Claim 7
Dependent Claim
111 words
A shield construction for shielding an electrical device from external electromagnetic interference where said electrical device is covered by insulated materials and has a plurality of leads extending therefrom for signal, ground and power supply connections, said shield construction comprising: two portions of conducting materials mounted on and extending over at least one major surface of said electrical device, connecting means connecting at least one said portion to the potential of said ground leads and the other said portion to said signal lead, and at least one capacitor mounted on the conductive materials, the electrodes of which are each connected separately to one of said portions of said conductive materials respectively.
Claim 8
Dependent Claim
111 words
A shield construction for shielding an electrical device from external electromagnetic interference where said electrical device is covered by insulated materials and has a plurality of leads extending therefrom for signal, ground and power supply connections, said shield construction comprising: two portions of conducting materials mounted on and extending over at least one major surface of said electrical device, connecting means connecting at least one said portion to the potential of said ground leads and the other said portion to said signal lead, and at least one capacitor mounted on the conductive materials, the electrodes of which are each connected separately to one of said portions of said conductive materials respectively.
Claim 9
Dependent Claim
13 words
The shield construction of claim 6, wherein said conductive materials are conductive films.
Claim 10
Dependent Claim
20 words
The shield construction of claim 6, wherein said conductive materials are metal films which are plated on said electrical devices.
Claim 11
Dependent Claim
15 words
The shield construction of claim 6, wherein said conductive materials are formed on flexible sheets.
References Cited (Backward Citations)
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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) | 1996-12-13 | 1997-06-14 | 1997-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-13 | 2001-06-14 | 2001-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-13 | 2005-06-14 | 2005-12-14 | $7700.00 | Window Closed / Lapsed |