Patent US4728856A successfully refreshed from Google Patents.
US4728856A
Expired / Lapsed
US
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Cathode ray tube
Assignee: Mitsubishi Electric Corp
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Filing: 1984-05-09
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Granted: 1988-03-01
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Expires: 2004-05-09
Abstract
Abstract A cathode ray tube comprises a face plate glass containing neodymium oxide (Nd 2 O 3 ); and a phosphor screen of plural color phosphors formed on an inner surface of said face plate glass wherein a phosphor of zinc sulfide activated with copper and aluminum (ZnS:Cu, Al) or a phosphor of zinc sulfide activated with copper, gold and aluminum (ZnS:Cu, Au, Al) is used as a green phosphor of said phosphor screen.
Inventors
- 👤 Yasuo Iwasaki
- 👤 Koji Yajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:01
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/24; H01J29/185; H01J29/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
A cathode ray tube having a face plate glass which contains neodymium oxide (Nd 2 O 3 ) and exhibits a sharp main absorption band having a peak at about 580 nm and a sub-absorption at about 530 nm and on the inner surface of which a phosphor screen having blue, green and red phosphors is formed, wherein said blue phosphor is a phosphor of zinc sulfide activated with Ag(ZnS:Ag), said red phosphor is a phosphor of yttrium oxysulfide activated with Eu(Y 2 O 2 S:Eu), and said green phosphor is a phosphor of zinc sulfide activated with copper and aluminum (ZnS:Cu, Al) to reduce the spectral reflectance of said phosphor screen at the wavelength band of 470-480 nm so that the chromaticity point of a reflected exterior light reflected from said phosphor screen is prevented from displacement with respect to the chromaticity point of an exterior light due to the influence of said main and sub-absorption bands.
Claim 2
Dependent Claim
158 words
A cathode ray tube having a face plate glass which contains neodymium oxide (Nd 2 O 3 ) and exhibits a sharp main absorption band having a peak at about 580 nm and a sub-absorption at about 530 nm and on the inner surface of which a phosphor screen having blue, green and red phosphors is formed, wherein said blue phosphor is a phosphor of zinc sulfide activated with Ag(ZnS:Ag), said red phosphor is a phosphor of yttrium oxysulfide activated with Eu(Y 2 O 2 S:Eu), and said green phosphor is a phosphor of zinc sulfide activated with copper and aluminum (ZnS:Cu, Al) to reduce the spectral reflectance of said phosphor screen at the wavelength band of 470-480 nm so that the chromaticity point of a reflected exterior light reflected from said phosphor screen is prevented from displacement with respect to the chromaticity point of an exterior light due to the influence of said main and sub-absorption bands.
Claim 3
Dependent Claim
33 words
The cathode ray tube according to claim 1, wherein a content of copper (Cu) as an activator is 3×10 -4 g, or more to 1 g. of zinc-sulfide (ZnS) as the main component.
Claim 4
Dependent Claim
22 words
The cathode ray tube according to claim 1, wherein each of said blue and red phosphors is a phosphor with a colorant.
Claim 5
Dependent Claim
161 words
A cathode ray tube having a face plate glass which contains neodymium oxide (Nd 2 O 3 ) and exhibits a sharp main absorption band having a peak at about 580 nm and a sub-absorption band at about 530 nm and on the inner surface of which a phosphor screen having blue, green and red phosphors is formed, wherein said blue phosphor is a phosphor of zinc sulfide activated with Ag(ZnS:Ag), said red phosphor is a phosphor of yttrium oxysulfide activated with Eu(Y 2 O 2 S:Eu) and said green phosphor is a phosphor of zinc sulfide activated with copper, gold and aluminum (ZnS:Cu, Au, Al) to reduce the spectral reflectance of said phosphor screen at the wavelength band of 470-480 nm so that the chromaticity point of a reflected exterior light reflected from said phosphor screen is prevented from displacement with respect to the chromaticity point of an exterior light due to the influence of said main and sub-absorption bands.
Claim 6
Dependent Claim
161 words
A cathode ray tube having a face plate glass which contains neodymium oxide (Nd 2 O 3 ) and exhibits a sharp main absorption band having a peak at about 580 nm and a sub-absorption band at about 530 nm and on the inner surface of which a phosphor screen having blue, green and red phosphors is formed, wherein said blue phosphor is a phosphor of zinc sulfide activated with Ag(ZnS:Ag), said red phosphor is a phosphor of yttrium oxysulfide activated with Eu(Y 2 O 2 S:Eu) and said green phosphor is a phosphor of zinc sulfide activated with copper, gold and aluminum (ZnS:Cu, Au, Al) to reduce the spectral reflectance of said phosphor screen at the wavelength band of 470-480 nm so that the chromaticity point of a reflected exterior light reflected from said phosphor screen is prevented from displacement with respect to the chromaticity point of an exterior light due to the influence of said main and sub-absorption bands.
Claim 7
Dependent Claim
32 words
The cathode ray tube according to claim 4, wherein a content of gold (Au) as an activator is 4×10.sup.×4 g. or more to 1 g. of zinc-sulfide (ZnS) as the main component.
Claim 8
Dependent Claim
22 words
The cathode ray tube according to claim 4, wherein each of said blue and red phosphors is a phosphor with a colorant.
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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) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |