US3939375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube having channel multiplier and electron reflecting system for energizing color phosphor strips
Assignee: US Philips Corp
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Filing: 1974-12-03
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Granted: 1976-02-17
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Expires: 1994-12-03
Abstract
Abstract A channel plate with color selection electrodes and color phosphors for use an an image display screen in a color television tube. This is a division of application Ser. No. 288,597 filed Sept. 13, 1972, now U.S. Pat. No. 3,860,849.
Inventors
- 👤 Pieter Schagen
- 👤 Hewson Nicholas Graham King
- 👤 Derek Washington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:00
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/20; H01J43/00; H01J43/04; H01J43/06; H01J43/18; H01J43/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
An image display screen for use in a color television tube, comprising: a channel plate defining a display area and having an input side for receiving electrons into channels of said channel plate from a scanning electron beam and an output side for delivering electrons from channels of said channel plate; at least two interdigitated color selection electrodes insulated from and substantially covering the output side of said channel plate but shaped so as to not block the channels of said channel plate; separate phosphor layers covering each of said at least two interdigitated electrodes on the side thereof remote from said channel plate; said separate phosphor layers corresponding to different colors; and a further electrode coextensive with said channel plate and spaced from and facing said separate phosphor layers, whereby electrons delivered from a channel of said channel plate may be directed toward and be caused to collide with the phosphor layer covering a selected one of said electrodes in the vicinity of said channel by application of appropriate electrical potentials to said electrodes.
Claim 2
Dependent Claim
175 words
An image display screen for use in a color television tube, comprising: a channel plate defining a display area and having an input side for receiving electrons into channels of said channel plate from a scanning electron beam and an output side for delivering electrons from channels of said channel plate; at least two interdigitated color selection electrodes insulated from and substantially covering the output side of said channel plate but shaped so as to not block the channels of said channel plate; separate phosphor layers covering each of said at least two interdigitated electrodes on the side thereof remote from said channel plate; said separate phosphor layers corresponding to different colors; and a further electrode coextensive with said channel plate and spaced from and facing said separate phosphor layers, whereby electrons delivered from a channel of said channel plate may be directed toward and be caused to collide with the phosphor layer covering a selected one of said electrodes in the vicinity of said channel by application of appropriate electrical potentials to said electrodes.
Claim 3
Dependent Claim
27 words
An image display screen as defined in claim 1 wherein said at least two interdigitated electrodes each comprise a multiplicity of spaced electrically connected parallel strip-like elements.
Claim 4
Dependent Claim
31 words
An image display screen as defined in claim 2, wherein said strip-like elements have a width on the order of the distance between centers of adjacent channels of said channel plate.
Claim 5
Dependent Claim
35 words
An image display screen as defined in claim 3 and further comprising an additional phosphor layer corresponding to an additional color substantially covering said further electrode on the side thereof facing said separate phosphor layers.
Claim 6
Dependent Claim
44 words
An image display screen as defined in claim 3, wherein the exits of channels at the output side of said channel plate are in rows and said strip-like elements each substantially cover the area of said output side between two adjacent rows of exits.
Claim 7
Dependent Claim
43 words
An image display screen as defined in claim 3, wherein the exits of channels at the output side of said channel plate are in rows and said strip-like elements each substantially cover the area of said output side surrounding one of said rows.
Claim 8
Dependent Claim
22 words
An image display screen as defined in claim 3, wherein said at least two interdigitated color selection electrodes comprise three such electrodes.
References Cited (Backward Citations)
US3742287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |