US3668466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron type fluorescent display device with planar adjacent control electrode
Assignee: Sony Corp
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Filing: 1970-04-13
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Granted: 1972-06-06
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Expires: 1990-04-13
Abstract
Abstract An electron tube having at least two electrodes and a cathode disposed within an evacuated envelope. One of the electrodes is spaced generally transversely with respect to the electro beam path from the cathode to the other electrode. The electrode which is spaced from the electron beam path is used to control the cathode current. Means are provided to couple various voltages to the respective electrodes to accomplish the desired control. The anode electrode may have a phosphor coating thereon so as to glow when bombarded by an electron beam from the cathode. Accordingly, an electron tube of this type is adaptable to display units for the display of letters, symbols, numerals and the like. In one form of the invention, the anode electrode and the control electrodes are arranged in a predetermined pattern to cause elemental areas of the anode electrode to glow and produce a display.
Inventors
- 👤 Satoshi Shimada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:49
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/15
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
256 words
An electron tube comprising: an evacuated envelope with at least one side transparent; an insulating base mounted in said envelope such that at least part of a first side is visible through the transparent side of said envelope; a first plurality of indicator electrodes mounted on the first side of the base and arranged in the form of a figure 8; a second electrode of planar form mounted on said first side of said base and surrounding said first plurality of indicator electrodes and lying substantially in the same plane as said first plurality of indicator electrodes; a cathode electrode mounted in said envelope adjacent said indicator electrodes and said second electrode; a plurality of selector leads mounted on said base and respectively connected to said first plurality of indicator electrodes; control means connected to said plurality of selector leads and adapted to selectively apply a voltage to said indicator electrodes which is positive relative to said cathode; a second electrode lead mounted on said base and electrically connected to said second electrode, and said control means connected to said second electrode lead to selectively apply a voltage to said second electrode which can be switched bEtween two values such that when at one value sufficient current passes between said cathode and indicator electrodes to render said indicator electrodes visible and when at the other value insufficient current passes between said cathode and said indicator electrodes to render said indicator electrodes visible and wherein a layer of phosphor material covers said first plurality of indicator electrodes.
Claim 2
Dependent Claim
256 words
An electron tube comprising: an evacuated envelope with at least one side transparent; an insulating base mounted in said envelope such that at least part of a first side is visible through the transparent side of said envelope; a first plurality of indicator electrodes mounted on the first side of the base and arranged in the form of a figure 8; a second electrode of planar form mounted on said first side of said base and surrounding said first plurality of indicator electrodes and lying substantially in the same plane as said first plurality of indicator electrodes; a cathode electrode mounted in said envelope adjacent said indicator electrodes and said second electrode; a plurality of selector leads mounted on said base and respectively connected to said first plurality of indicator electrodes; control means connected to said plurality of selector leads and adapted to selectively apply a voltage to said indicator electrodes which is positive relative to said cathode; a second electrode lead mounted on said base and electrically connected to said second electrode, and said control means connected to said second electrode lead to selectively apply a voltage to said second electrode which can be switched bEtween two values such that when at one value sufficient current passes between said cathode and indicator electrodes to render said indicator electrodes visible and when at the other value insufficient current passes between said cathode and said indicator electrodes to render said indicator electrodes visible and wherein a layer of phosphor material covers said first plurality of indicator electrodes.
Claim 3
Dependent Claim
14 words
An electron tube according to claim 1 wherein opaque material covers said second electrode.
Claim 4
Dependent Claim
26 words
An electron tube according to claim 1 wherein a layer of phosphor material covers said second electrode in areas adjacent said first plurality of indicator electrodes.
Claim 5
Dependent Claim
39 words
An electron tube according to claim 1 comprising an auxiliary indicator electrode mounted on said base adjacent said first plurality of indicator electrodes, and an auxiliary indicator lead connected to said auxiliary indicator electrode and to said control means.
Claim 6
Dependent Claim
111 words
An electron tube according to claim 1 comprising a second plurality of indicator electrodes mounted on the first side of the base adjacent the first plurality of indicator electrodes and arranged in the form of a figure 8, a third electrode of planar form on said first side of said base adjacent said cathode electrode and surrounding said second plurality of indicator electrodes and lying substantially in the same plane as said second plurality of indicator electrodes, said first plurality of selector leads respectively connected to said second plurality of indicator electrodes, and a third electrode lead mounted on said base and electrically connecting said third electrode to said control means.
Claim 7
Dependent Claim
20 words
An electron tube according to claim 5 wherein a layer of phosphor material covers said second plurality of indicator electrodes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |