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US4100454A
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US
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Low-velocity electron excited fluorescent display device
Assignee: Dai Nippon Toryo Co Ltd
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Filing: 1976-01-20
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Granted: 1978-07-11
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Expires: 1996-01-20
Abstract
Abstract A fluorescent display device capable of emitting blue to green light of high luminance and purity is composed of a vacuum tube having an anodic plate bearing thereon a fluorescent screen and a cathode facing the fluorescent screen. The fluorescent screen comprises a gallate-based phosphor represented by the formula A(Zn.sub.1-x,Mg.sub.x)O·Ga.sub.2 O.sub.3 :BMn wherein 0.6 ≦ A ≦ 1.2, 0 ≦ B ≦ 5 × 10 -2 , and 0 ≦ x ≦ 1.0. The vacuum tube may further contain a control grid between the anodic plate and the cathode.
Inventors
- 👤 Takashi Hase
- 👤 Akiyasu Kagami
- 👤 Yoshiyuki Mimura
- 👤 Kinichiro Narita
- 👤 Minoru Hiraki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:51
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/15; C; C09; C09K; C09K11/00; C09K11/08; C09K11/62
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
A low-velocity electron excited fluorescent display device composed of a vacuum container or tube containing disposed therein at least an anodic plate having formed on one surface thereof a fluorescent screen and a cathode in line-form paralleling said fluorescent screen, said fluorescent screen comprising a gallate-based phosphor represented by the formula A(Zn.sub.1-x,Mg.sub.x)O.Ga.sub.2 O.sub.3 :BMn wherein 0.6 ≦ A ≦ 1.2, 0 ≦ B ≦ 5 × 10 -2 , and 0 ≦ x ≦ 0.5.
Claim 2
Dependent Claim
75 words
A low-velocity electron excited fluorescent display device composed of a vacuum container or tube containing disposed therein at least an anodic plate having formed on one surface thereof a fluorescent screen and a cathode in line-form paralleling said fluorescent screen, said fluorescent screen comprising a gallate-based phosphor represented by the formula A(Zn.sub.1-x,Mg.sub.x)O.Ga.sub.2 O.sub.3 :BMn wherein 0.6 ≦ A ≦ 1.2, 0 ≦ B ≦ 5 × 10 -2 , and 0 ≦ x ≦ 0.5.
Claim 3
Dependent Claim
40 words
A fluorescent display device as claimed in claim 1 wherein said gallate-based phosphor is represented by the formula A(Zn.sub.1-x,Mg.sub.x)O.Ga.sub.2 O.sub.3 :BMn wherein 0.9 ≦ A ≦ 1.0, and 5 × 10 -4 ≦ B ≦ 5 × 10 -2 .
Claim 4
Dependent Claim
26 words
A fluorescent display device as claimed in claim 1 wherein said gallate-based phosphor is represented by the formula A(Zn.sub.1-x,Mg.sub.x)O.Ga.sub.2 O.sub.3 wherein 0.9 ≦ A ≦ 1.0.
Claim 5
Dependent Claim
22 words
A fluorescent display device as claimed in claim 1 wherein a control grid is disposed between said anodic plate and said cathode.
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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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |