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US5260626A
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Apparatus for suppressing field radiation from display device
Assignee: DR ING ROBERTO DINI ITALIANA PER LO SVILUPPO DELL'ELETTRONICA SASVEL SpA Soc
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Filing: 1992-02-19
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Granted: 1993-11-09
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Expires: 2012-02-19
Abstract
Abstract In order to eliminate any harmful influence due to electric field radiation on the human body, electric field radiation from a front surface of a cathode ray tube is reduced. A degaussing coil arranged in proximity to a peripheral edge of a front surface of a cathode ray tube is employed advantageously. The degaussing coil is supplied with a voltage which is opposite in polarity to an electric field radiated from the front surface of the cathode ray tube. The reverse polarity voltage is derived from an output signal obtained from an output signal of a horizontal deflection circuit by a flyback transformer and/or derived from a voltage obtained by phase-inverting an anode voltage fluctuating in vertical synchronization. After a degaussing operation is completed, relay contacts are opened on the basis of a timer-controlled relay switch, thereby completely cutting the connection between the degaussing coil and a degaussing power source generating an alternating current which is supplied to the degaussing coil for the degaussing operation.
Inventors
- 👤 Katsuhisa Takase
- 👤 Masakazu Terada
- 👤 Yoshikazu Sakai
- 👤 Masatoshi Michihata
- 👤 Yoshiyuki Nakashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:03
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/003; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/29; H01J2229/00; H01J2229/0007; H01J2229/0015; H01J2229/0046; H01J2229/0053
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
55 words
An apparatus for suppressing electric field radiation from a display device, comprising: an electrode arranged in proximity to the peripheral edge of a display surface of a display device; and means for supplying said electrode with a voltage of reverse polarity relative to an electric field radiated from said display surface of said display device.
Claim 2
Independent Claim
55 words
An apparatus for suppressing electric field radiation from a display device, comprising: an electrode arranged in proximity to the peripheral edge of a display surface of a display device; and means for supplying said electrode with a voltage of reverse polarity relative to an electric field radiated from said display surface of said display device.
Claim 3
Dependent Claim
62 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 1, wherein said display device includes a cathode ray tube, said electrode is arranged in proximity to the peripheral edge of said front surface of said cathode ray tube, and said electric field includes an electric field radiated from said front surface of said cathode ray tube.
Claim 4
Dependent Claim
37 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 2, wherein a degaussing coil is provided in relation to said cathode ray tube, said electrode being provided by said degaussing coil.
Claim 5
Dependent Claim
58 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 3, wherein said degaussing coil is connected to a degaussing power source for generating an alternating current which is attenuated with a lapse of time, said apparatus further comprising means for completely cutting connection between said degaussing coil and said degaussing power source.
Claim 6
Dependent Claim
26 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 4, wherein said means for cutting connection includes a timer-controlled switch.
Claim 7
Dependent Claim
45 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 2, wherein said means for supplying said electrode with said voltage of reverse polarity includes means for adjusting the phase and regulating the amplitude of said voltage of reverse polarity.
Claim 8
Dependent Claim
51 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 2, wherein said voltage of reverse polarity is provided by a signal of reverse in polarity relative to a flyback pulse signal of a horizontal deflection circuit, said signal being derived from said flyback pulse signal.
Claim 9
Dependent Claim
45 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 2, wherein said voltage of reverse polarity includes a voltage obtained by phase-inverting a voltage, fluctuating in vertical synchronization, which is applied to an anode of said cathode ray tube.
Claim 10
Dependent Claim
75 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 2, wherein said voltage of reverse polarity includes a voltage provided by a signal which is reverse in polarity to a flyback signal of a horizontal deflection circuit, said signal being derived from said flyback pulse signal, and a voltage obtained by phase-inverting a voltage, fluctuating in vertical synchronization, which is applied to an anode of said cathode ray tube.
Claim 11
Dependent Claim
85 words
An apparatus for suppressing field radiation from a display device in accordance with claim 2, further comprising a plurality of stop members arranged around said cathode ray tube, and said electrode comprises a conductive member provided with a conductive wire of a prescribed length having both end portions being tied up toward the same direction, said conductive member engaging with said plurality of stop members, and a slider being movable along said tied end portions of said wire while receiving said end portions in common.
Claim 12
Dependent Claim
44 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 10, wherein said plurality of stop members are located on a front panel which is arranged to cover the periphery of said front surface of said cathode ray tube.
Claim 13
Dependent Claim
22 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 10, wherein said conductive wire is insulation-coated.
Claim 14
Dependent Claim
23 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 10, wherein said slider has a tubular configuration.
Claim 15
Dependent Claim
25 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 13, wherein said slider is formed of an insulating material.
Claim 16
Dependent Claim
56 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 1, wherein said display device includes a display panel of an alternatingly driven flat display device, said electrode is arranged in a peripheral portion of said display panel, and said electric field includes an electric field radiated from said display panel.
Claim 17
Dependent Claim
38 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 15, wherein said means for supplying said electrode with said voltage of reverse polarity includes means for amplitude-regulating said voltage of reverse polarity.
Claim 18
Dependent Claim
37 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 15, wherein said display panel comprises a liquid crystal display panel having a common electrode which is supplied with an alternating voltage.
Claim 19
Dependent Claim
36 words
An apparatus for suppressing electric field radiation from a display device in accordance with claim 17, wherein said means for supplying said electrode with said voltage of reverse polarity includes means for phase-inverting said alternating voltage.
Claim 20
Dependent Claim
33 words
An apparatus for suppressing field radiation from a display device in accordance with claim 15, further including a chassis frame for holding said display panel, said electrode being arranged on said chassis frame.
Claim 21
Dependent Claim
39 words
An apparatus for suppressing field radiation om a display device in accordance with claim 15, further including a front panel which is arranged to cover the periphery of said display panel, said electrode being arranged on said front panel.
References Cited (Backward Citations)
US4922153A
Cited
EP0272234A2
Cited
EP0316817A1
Cited
DE8716945U1
Cited
GB2217959A
Cited
WO1990010992A1
Cited
US5101139A
Cited
US4996461A
Cited
US5107179A
Cited
US5151635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |