US3601648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A conductive film for electromagnetic deflection device
Assignee: Panasonic Holdings Corp
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Filing: 1968-06-26
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Granted: 1971-08-24
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Expires: 1988-06-26
Abstract
Abstract A conductive surface for an electromagnetic deflection device formed with helical, linear or zigzag gaps to thereby alter a current which flows through the conductive surface due to electromagnetic induction, thereby making possible a high frequency magnetic field within the device.
Inventors
- 👤 Yoshihiro Uno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:14
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/76; H01J2229/00; H01J2229/48; H01J2229/4824; H01J2229/4827
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
An induction current reducing device for an electromagnetic deflection device of a High-frequency magnetic deflection type cathode ray tube, comprising an insulating envelope defining a vacuum, high-frequency deflection coil means mounted on a part of the outside surface of said envelope, a conductive film coated on the inside surface thereof, and means reducing induction current flowing through the conductive film due to the high-frequency operation of said deflection coil means, including at least one nonconductive gap region provided in said film at a place which traverses the high-frequency deflecting magnetic field of said coil means.
Claim 2
Dependent Claim
95 words
An induction current reducing device for an electromagnetic deflection device of a High-frequency magnetic deflection type cathode ray tube, comprising an insulating envelope defining a vacuum, high-frequency deflection coil means mounted on a part of the outside surface of said envelope, a conductive film coated on the inside surface thereof, and means reducing induction current flowing through the conductive film due to the high-frequency operation of said deflection coil means, including at least one nonconductive gap region provided in said film at a place which traverses the high-frequency deflecting magnetic field of said coil means.
Claim 3
Dependent Claim
106 words
An electromagnetic deflection device of a high-frequency magnetic deflection type cathode-ray tube, comprising an insulating envelope defining a vacuum therein, said envelope defining a tubular portion through which an electron beam is directed, high-frequency deflection coil means mounted on a part of the outside surface of said tubular portion, a conductive film coated on the inside surface of said tubular portion and means reducing induction current flowing through the conductive film due to the high-frequency operation of said deflection coil means, including at least one nonconductive gap region provided in said film at a place which traverses the high-frequency deflecting magnetic field of said coil means.
Claim 4
Dependent Claim
106 words
An electromagnetic deflection device of a high-frequency magnetic deflection type cathode-ray tube, comprising an insulating envelope defining a vacuum therein, said envelope defining a tubular portion through which an electron beam is directed, high-frequency deflection coil means mounted on a part of the outside surface of said tubular portion, a conductive film coated on the inside surface of said tubular portion and means reducing induction current flowing through the conductive film due to the high-frequency operation of said deflection coil means, including at least one nonconductive gap region provided in said film at a place which traverses the high-frequency deflecting magnetic field of said coil means.
Claim 5
Dependent Claim
19 words
An electromagnetic deflection device according to claim 2, wherein said conductive film is uniformly coated on said tubular portion.
Claim 6
Dependent Claim
17 words
An electromagnetic deflection device according to claim 2, wherein said nonconductive gap region has a helical form.
Claim 7
Dependent Claim
25 words
An electromagnetic deflection device according to claim 2, wherein said nonconductive gap region comprises a plurality of parallel band-shaped gaps with an equal distance therebetween.
Claim 8
Dependent Claim
15 words
An electromagnetic deflection device according to claim 2, wherein said nonconductive region has zigzag gaps.
References Cited (Backward Citations)
CA682302A
Cited
US2569654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |