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US4468589A
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Low speed electron excited fluorescent material and fluorescent display tube
Assignee: FUTABA DENSHI KOGYO 629 OSHIBA MOBARA-SHI CHIBA-KEN JAPAN KK
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Filing: 1982-08-13
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Granted: 1984-08-28
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Expires: 2002-08-13
Abstract
Abstract A low speed electron excited fluorescent material is disclosed comprising a ZuO:Zn fluorescent component excited by low speed electrons to emit light and an additive component selected from the group consisting of W, Mo, V and their oxides, and capable of emitting light of a uniform luminance and exhibiting improved temperature characteristics. A fluorescent display tube is also disclosed using such fluorescent material.
Inventors
- 👤 Chuichi Hikida
- 👤 Tatsuo Yamaura
- 👤 Yuuzi Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:04
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/67; C09K11/69; C09K11/691; C09K11/693; C09K11/68; C09K11/681; C09K11/682; H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/15
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
47 words
A low speed electron excited fluorescent material comprising a ZnO-Zn fluorescent component excited by law speed electrons impinging thereon to emit light and at least one additive component selected from the group consisting of W, Mo, V and their oxides which is added to said fluorescent component.
Claim 2
Dependent Claim
47 words
A low speed electron excited fluorescent material comprising a ZnO-Zn fluorescent component excited by law speed electrons impinging thereon to emit light and at least one additive component selected from the group consisting of W, Mo, V and their oxides which is added to said fluorescent component.
Claim 3
Dependent Claim
32 words
A low speed electron excited fluorescent material as defined in claim 1, wherein said additive component is added to said fluorescent component in amount of 0.1-50 wt.% based on said fluorescent component.
Claim 4
Dependent Claim
86 words
A fluorescent display tube comprising an anode having a fluorescent material layer deposited on the upper surface thereof and a filamentary cathode for emitting electrons which impinge on said fluorescent material layer to allow it to emit luminous light, wherein said fluorescent material layer is composed of a ZnO:Zn fluorescent component excited by low speed electrons impinging thereon to emit light and at least one additive component selected from the group consisting of W, Mo, V and their oxides which is added to said fluorescent component.
Claim 5
Dependent Claim
86 words
A fluorescent display tube comprising an anode having a fluorescent material layer deposited on the upper surface thereof and a filamentary cathode for emitting electrons which impinge on said fluorescent material layer to allow it to emit luminous light, wherein said fluorescent material layer is composed of a ZnO:Zn fluorescent component excited by low speed electrons impinging thereon to emit light and at least one additive component selected from the group consisting of W, Mo, V and their oxides which is added to said fluorescent component.
Claim 6
Dependent Claim
29 words
A fluorescent display tube as defined in claim 3, wherein said additive component is added to said fluorescent component in amount of 0.1-50 wt.% based on said fluorescent component.
Claim 7
Dependent Claim
25 words
A fluorescent display tube as defined in claim 3 or 4, wherein said fluorescent material layer is disposed through said anode on a darkened substrate.
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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |