Patent US4406971A successfully refreshed from Google Patents.
US4406971A
Expired / Lapsed
US
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Color cathode ray tube having a reference white fluorescent screen
Assignee: FUJI TELECASTING Co
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Filing: 1979-07-11
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Granted: 1983-09-27
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Expires: 1999-07-11
Abstract
Abstract A color cathode ray tube comprises a first fluorescent part on a part of an inner surface of a face plate and said first fluorescent part imparting a luminescence of a predetermining reference white color by irradiation of electron beams; a second fluorescent part on the remained part of the face plate and said second fluorescent part imparting red, green and blue fluorescent dots or stripes wherein the first fluorescent part for the reference white color is formed by a mixture or tricolor fluorescent materials for the second fluorescent part or a mixture of tricolor fluorescent materials which imparts a luminous spectrum being similar to that of the tricolor fluorescent materials for the second fluorescent part.
Inventors
- 👤 Yutaka Takano
- 👤 Koji Yajima
- 👤 Takashi Ishii
- 👤 Tadahisa Yoshida
- 👤 Katsuhiro Ota
- 👤 Shigeru Yagishita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:04
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/187; H01J29/26; H01J29/28; H01J29/30; H01J29/32; H01J29/322; H01J29/34; H01J31/00; H01J31/08; H01J31/10; H01J31/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
107 words
In a color cathode ray tube having on an inner surface of a face plate a first fluorescent part for luminescence of a predetermined reference white color by irradiation with electron beams from three tricolor electron guns, and a second fluorescent part for luminescence of red, green and blue fluorescent tricolor dots or tricolor stripes on the remainder of the face plate, an improvement comprising: the first fluorescent part for the reference white color formed of a blended mixture of the tricolor fluorescent materials used for the second fluorescent part which imparts said reference white color upon irradiation with electron beams from said three tricolor electron guns.
Claim 2
Dependent Claim
107 words
In a color cathode ray tube having on an inner surface of a face plate a first fluorescent part for luminescence of a predetermined reference white color by irradiation with electron beams from three tricolor electron guns, and a second fluorescent part for luminescence of red, green and blue fluorescent tricolor dots or tricolor stripes on the remainder of the face plate, an improvement comprising: the first fluorescent part for the reference white color formed of a blended mixture of the tricolor fluorescent materials used for the second fluorescent part which imparts said reference white color upon irradiation with electron beams from said three tricolor electron guns.
Claim 3
Dependent Claim
46 words
A color cathode ray tube according to claim 1 wherein the fluorescent material of the first fluorescent part for the reference white color is a mixture of red, green and blue fluorescent materials selected from the red, green and blue fluorescent materials for P-22 fluorescent materials.
Claim 4
Dependent Claim
55 words
A color cathode ray tube according to claim 2 wherein the first fluorescent part for the reference white color is formed by using a mixture of Y 2 O 3 :Eu as a red fluorescent material, (Zn, Cd)S:Cu:Al as a green fluorescent material and ZnS:Ag as a blue fluorescent material at ratios of about 1.0:0.95:0.81.
Claim 5
Dependent Claim
53 words
A color cathode ray tube according to claim 2 wherein the first fluorescent part for the reference white color is formed by using mixture of Y 2 O 2 S:Eu as a red fluorescent material, Zn:Al:Cu as a green fluorescent material and ZnS:Ag as a blue fluorescent material at ratios of about 1.0:0.58:0.47.
Claim 6
Dependent Claim
66 words
A color cathode ray tube according to claim 2 wherein the first fluorescent part for the reference white color is formed by using a mixture of a red fluorescent material selected from Y 2 O 3 :Eu, YVO 4 :Eu and Y 2 O 2 S:Eu; and a green fluorescent material selected from (Zn, Cd) S:Cu:Al, ZnS:Al:Cu and ZnS:Cu:Au:Al; and a blue fluorescent material of ZnS:Ag.
Claim 7
Dependent Claim
29 words
A color cathode ray tube according to claim 1 wherein a light absorbing zone is formed at a boundary between the first fluorescent part and the second fluorescent part.
Claim 8
Dependent Claim
22 words
A color cathode ray tube according to claim 6 wherein the light absorbing zone is formed by coating graphite or manganese dioxide.
Claim 9
Dependent Claim
45 words
A color cathode ray tube according to claim 1 wherein the first flourescent part for the reference white color is provided at an effective display part selected from an upper edge, a lower edge, a right edge and a left edge on the face plate.
Claim 10
Dependent Claim
100 words
In a color cathode ray tube having on an inner surface of a face plate a first fluorescent part for luminescence of a predetermined reference white color by irradiation with electron beams from three tricolor electron guns, and a second fluorescent part for luminescence of red, green and blue fluorescent tricolor dots or tricolor stripes on the remainder of the face plate, an improvement comprising: the first fluorescent part for the reference white color formed of a blended mixture of tricolor fluorescent materials which imparts said reference white color upon irradiation with electron beams from said three tricolor electron guns.
Claim 11
Dependent Claim
100 words
In a color cathode ray tube having on an inner surface of a face plate a first fluorescent part for luminescence of a predetermined reference white color by irradiation with electron beams from three tricolor electron guns, and a second fluorescent part for luminescence of red, green and blue fluorescent tricolor dots or tricolor stripes on the remainder of the face plate, an improvement comprising: the first fluorescent part for the reference white color formed of a blended mixture of tricolor fluorescent materials which imparts said reference white color upon irradiation with electron beams from said three tricolor electron guns.
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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) | 1986-09-26 | 1987-03-28 | 1987-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-26 | 1991-03-28 | 1991-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-26 | 1995-03-28 | 1995-09-27 | $7700.00 | Window Closed / Lapsed |