US3560649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube with projection means
Assignee: Tektronix Inc
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Filing: 1967-05-23
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Granted: 1971-02-02
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Expires: 1987-05-23
Abstract
Abstract A display means including a cathode-ray tube provided with light projection means or imaging a graticule or the like substantially in the plane of the cathode-ray tube''s phosphor screen. Light projection is from the rear of the screen. The apparatus includes means for impeding or blocking the transmission of direct light originating in the projection means in order to prevent the occurence of a bright spot in the display.
Inventors
- 👤 Robert H Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:46
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/34; H01J29/86; H01J29/89; H01J29/894
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
203 words
A viewable display apparatus comprising: an electron tube including a transparent faceplate and a phosphor layer disposed on the inside of said faceplate; an electron source for directing electrons toward said phosphor layer; light projection means for providing a real image substantially in the plane of said phosphor layer, said light projection means projecting said image from the side of said phosphor layer which is toward the inside of said tube; means for substantially impeding direct light directed toward said phosphor layer from said projection means form passing substantially straight through said phosphor layer and faceplate; said impeding means comprising a first layer having a multiplicity of openings therein, and a second layer in registry with said first layer; said second layer having direct light blocking areas disposed in registration with the openings in said first layer in the direction of directly projected light from said light projection means; wherein one of said layers is positioned between the other of said layers and the point from which the display may be viewed; and at least one of the first and second layers being located substantially on said phosphor layer, said phosphor layer diffusing light around said light blocking areas in said second layer.
Claim 2
Dependent Claim
203 words
A viewable display apparatus comprising: an electron tube including a transparent faceplate and a phosphor layer disposed on the inside of said faceplate; an electron source for directing electrons toward said phosphor layer; light projection means for providing a real image substantially in the plane of said phosphor layer, said light projection means projecting said image from the side of said phosphor layer which is toward the inside of said tube; means for substantially impeding direct light directed toward said phosphor layer from said projection means form passing substantially straight through said phosphor layer and faceplate; said impeding means comprising a first layer having a multiplicity of openings therein, and a second layer in registry with said first layer; said second layer having direct light blocking areas disposed in registration with the openings in said first layer in the direction of directly projected light from said light projection means; wherein one of said layers is positioned between the other of said layers and the point from which the display may be viewed; and at least one of the first and second layers being located substantially on said phosphor layer, said phosphor layer diffusing light around said light blocking areas in said second layer.
Claim 3
Dependent Claim
44 words
The apparatus according to claim 1 wherein said first layer is light opaque but electron beam transmissive and is disposed on the side of said phosphor layer toward said electron source, and wherein said light blocking areas of said second layer are light opaque.
Claim 4
Dependent Claim
36 words
The apparatus according to claim 2 wherein said phosphor layer comprises a storage phosphor, said apparatus further including electron flood gun means for providing image storage in the region of said openings in said first layer.
Claim 5
Dependent Claim
53 words
The apparatus according to claim 1 wherein said first layer is light opaque but electron transmissive and is disposed on the side of said phosphor layer toward said electron source, and wherein the light blocking areas of said second layer are light opaque, said second layer being on the outside of said faceplate.
Claim 6
Dependent Claim
52 words
The apparatus according to claim 1 wherein said first layer is light opaque and is disposed on the inside of said faceplate between said faceplate and said phosphor layer, said light blocking areas of said second area being light opaque, said second layer being disposed on the outside of said glass faceplate.
Claim 7
Dependent Claim
19 words
The apparatus according to claim 2 wherein at least said first layer is thin and is composed of aluminum.
Claim 8
Dependent Claim
19 words
The apparatus according to claim 4 wherein at least said first layer is thin and is composed of aluminum.
Claim 9
Dependent Claim
26 words
The apparatus according to claim 6 wherein the area of said openings in said first layer is small compared to the remainder of said first layer.
Claim 10
Dependent Claim
162 words
Display apparatus comprising: an electron tube including a transparent faceplate and a phosphor layer disposed on the inside of said faceplate; an electron source for directing electrons toward said phosphor layer; light projection means for providing a real image substantially in the plane of said phosphor layer, said light projection means projecting said image from the side of said phosphor layer which is toward the inside of said tube; means for substantially impeding direct light directed toward said phosphor layer from said projection means from passing substantially straight through said phosphor layer and faceplate; and said impeding means including a light opaque but electron transmissive layer disposed on the side of said phosphor layer toward said electron gun and having openings therein, and an additional quantity of phosphor disposed over said openings on the opposite side of the plane of said light opaque layer from said phosphor layer, said additional quantity of phosphor acting to scatter direct light from said projection means.
Claim 11
Dependent Claim
162 words
Display apparatus comprising: an electron tube including a transparent faceplate and a phosphor layer disposed on the inside of said faceplate; an electron source for directing electrons toward said phosphor layer; light projection means for providing a real image substantially in the plane of said phosphor layer, said light projection means projecting said image from the side of said phosphor layer which is toward the inside of said tube; means for substantially impeding direct light directed toward said phosphor layer from said projection means from passing substantially straight through said phosphor layer and faceplate; and said impeding means including a light opaque but electron transmissive layer disposed on the side of said phosphor layer toward said electron gun and having openings therein, and an additional quantity of phosphor disposed over said openings on the opposite side of the plane of said light opaque layer from said phosphor layer, said additional quantity of phosphor acting to scatter direct light from said projection means.
Claim 12
Dependent Claim
51 words
The apparatus according to claim 1 wherein the light blocking areas of said second layer comprises color filtering means for filtering direct light projected to said areas in said second layer, said projection means projecting light of a color substantially filtered out by said light blocking areas of said second layer.
Claim 13
Dependent Claim
18 words
The apparatus according to claim 9 wherein at least said additional quantity of phosphor comprises a storage phosphor.
Claim 14
Dependent Claim
155 words
Display apparatus comprising: an electron tube including a transparent faceplate and a phosphor layer disposed on the inside of said faceplate; an electron source for directing electrons toward said phosphor layer; light projection means for providing a real image substantially in the same plane as said phosphor layer, said light projection means projecting said image from the side of said phosphor layer which is toward the inside of said tube; and means for substantially impeding direct light directed toward said phosphor layer from said projection means from passing substantially straight through said phosphor layer and faceplate, said impeding means comprising light polarizing means disposed in the path of light from said projection means on each side of said phosphor layer and having an orientation such as to substantially block passage of direct light from said projection means through both polarizing means, said phosphor layer diffusing light through the polarizing means remote from said electron source.
Claim 15
Dependent Claim
155 words
Display apparatus comprising: an electron tube including a transparent faceplate and a phosphor layer disposed on the inside of said faceplate; an electron source for directing electrons toward said phosphor layer; light projection means for providing a real image substantially in the same plane as said phosphor layer, said light projection means projecting said image from the side of said phosphor layer which is toward the inside of said tube; and means for substantially impeding direct light directed toward said phosphor layer from said projection means from passing substantially straight through said phosphor layer and faceplate, said impeding means comprising light polarizing means disposed in the path of light from said projection means on each side of said phosphor layer and having an orientation such as to substantially block passage of direct light from said projection means through both polarizing means, said phosphor layer diffusing light through the polarizing means remote from said electron source.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |