Patent US5517336A successfully refreshed from Google Patents.
Patent US3740603A successfully refreshed from Google Patents.
US3740603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray display tube with blanking grid
Assignee: IND ELECTRONIC ENG Inc
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Filing: 1972-03-30
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Granted: 1973-06-19
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Expires: 1992-03-30
Abstract
Abstract A display tube having a vacuum envelope with a fluorescent screen at one end thereof and a plurality of electron flood guns projecting a plurality of characters upon the screen from the other end of the display tube. The flood guns disposed in rows and columns and including a plurality of first means collectively energizable to provide a cloud of electrons for each one of the columns of the flood guns. A plurality of second means each associated with a respective row of the flood guns divides each of the clouds of electrons into a plurality of individual portions each associated with one of the flood guns. Third means accelerate each of the portions of the clouds of electrons into an individual stream of electrons to project one of the characters upon the screen. The second means can be selectively energized to inhibit the formation of the streams of electrons associated with a row of the flood guns. A plurality of fourth means each associated with one of the first means are selectively energizable to inhibit the formation of the cloud of electrons by the associated energized first means. Thus the fourth means enable the columns of the flood guns to be individually inhibited and the second means enable rows of the flood guns to be individually inhibited so that a single character can be displayed.
Inventors
- 👤 K Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:58
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/16
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
350 words
A display tube for selectively providing a visual display of a plurality of characters, comprising: an envelope; means disposed interiorly of the envelope at one end of the envelope to provide a screen upon which the characters are displayed; a plurality of first means disposed in columns at the end of the envelope opposite the screen, each having characteristics for being energized to provide a cloud of electrons in proximity to the associated one of the first means; second means for accelerating the electrons in each of the clouds of electrons to form at least one stream of electrons between the first means and the screen, wherein each of the streams of electrons has properties for displaying a different one of the characters upon the screen; a plurality of third means disposed on the far side of the first means relative to the screen and in columns in proximity to associated ones of the first means, the third means having characteristics for being selectively energized to inhibit the passage of the cloud of electrons from the associated first means; and a plurality of fourth means disposed in rows between the fluorescent screen and the first means and in proximity to the first means for enclosing at least a portion of each of the clouds of electrons provided by the first means wherein each of the portions of the clouds of electrons produces one of the streams of electrons; the fourth means having the characteristics for being selectively energized to inhibit the effect of the energized second means upon those portions of the clouds of electrons provided by the energized first means and enclosed by the energized fourth means; whereby all but a particular one of the third means is energized so that the only cloud of free electrons provided is that associated with the particular third means, and all but a particular one of the fourth means is energized so that only the cloud of free electrons associated with the particular third means and the particular fourth means can be formed into a stream of electrons by the second means.
Claim 2
Dependent Claim
350 words
A display tube for selectively providing a visual display of a plurality of characters, comprising: an envelope; means disposed interiorly of the envelope at one end of the envelope to provide a screen upon which the characters are displayed; a plurality of first means disposed in columns at the end of the envelope opposite the screen, each having characteristics for being energized to provide a cloud of electrons in proximity to the associated one of the first means; second means for accelerating the electrons in each of the clouds of electrons to form at least one stream of electrons between the first means and the screen, wherein each of the streams of electrons has properties for displaying a different one of the characters upon the screen; a plurality of third means disposed on the far side of the first means relative to the screen and in columns in proximity to associated ones of the first means, the third means having characteristics for being selectively energized to inhibit the passage of the cloud of electrons from the associated first means; and a plurality of fourth means disposed in rows between the fluorescent screen and the first means and in proximity to the first means for enclosing at least a portion of each of the clouds of electrons provided by the first means wherein each of the portions of the clouds of electrons produces one of the streams of electrons; the fourth means having the characteristics for being selectively energized to inhibit the effect of the energized second means upon those portions of the clouds of electrons provided by the energized first means and enclosed by the energized fourth means; whereby all but a particular one of the third means is energized so that the only cloud of free electrons provided is that associated with the particular third means, and all but a particular one of the fourth means is energized so that only the cloud of free electrons associated with the particular third means and the particular fourth means can be formed into a stream of electrons by the second means.
Claim 3
Dependent Claim
126 words
The display tube as recited in claim 1 wherein the fourth means comprise: a plurality of grid control bars each disposed transverse to an associated one of the first means so that a portion of each of the clouds of electrons is formed within each of the grid control bars; portions of each of the grid control bars defining one of a plurality of first apertures between each of the filaments and the display screen, each of the streams of electrons being directed through an associated one of the first apertures; and fifth switching means for selectively energizing at least one of the grid control bars in the fourth means to inhibit the formation of the streams of electrons associated with the energized grid control bars.
Claim 4
Dependent Claim
103 words
The display tube as recited in claim 2 wherein the third means comprise: a plurality of blanking grids each of which is disposed in proximity to an associated one of the first means, each of the blanking grids being energizable in a first polarity to inhibit the provision of the cloud of electrons by the associated first means so that the streams of electrons corresponding to the associated first means are not formed by the second means; and each of the blanking grids being energizable in a second polarity to enhance the provision of the cloud of electrons by the associated first means.
Claim 5
Dependent Claim
77 words
The display tube as recited in claim 3 wherein each of the blanking grids is disposed relative to the associated one of the first means and is energizable in the second polarity to cause the streams of electrons provided by the second means to appear to emanate from a point source and wherein means are included for providing a controlled energizing of individual ones of the blanking grids in the second polarity at particular periods of time.
Claim 6
Dependent Claim
62 words
The display tube as recited in claim 4 further comprising: a filament included in each of the first means and having a longitudinal configuration wherein the filament is disposed in a plane substantially parallel to the screen; and each of the blanking grids having a longitudinal configuration and disposed substantially parallel and in close proximity to a different one of the filaments.
Claim 7
Dependent Claim
106 words
The display tube as recited in claim 3 wherein the second means further comprises: an anode mask having a substantially planar configuration and disposed substantially parallel to the screen, portions of the anode mask defining second apertures a different one of which is disposed between each of the first apertures and the center of the screen; the anode mask having characteristics for being energized to create a first electric field in proximity to the first apertures for accelerating the portion of the clouds of electrons passing through the associated first apertures in the particular grid control bar and the associated second aperture in the anode mask.
Claim 8
Dependent Claim
82 words
The display tube as recited in claim 6 wherein: each of the grid control bars has characteristics for being energized to create a second electric field for opposing the transit of the electrons through the first apertures wherein the second electric field is stronger than the first electric field in proximity to the first apertures so that the portions of the clouds of electrons within the energized grid control bars are not formed into the streams of electrons by the anode mask.
Claim 9
Dependent Claim
266 words
A display tube having a plurality of electron flood guns at one end thereof for displaying a plurality of characters on a screen at the other end thereof, the electron flood guns comprising: a plurality of first means each disposed in columns wherein each column of first means provides one of a plurality of clouds of electrons for at least one of the flood guns; a plurality of second means disposed in rows between the first means and the screen, each of the rows of second means substantially enclosing a portion of each of the clouds of electrons provided by the first means; third means disposed between the second means and the screen and having properties for being energized to accelerate each of the portions of the clouds of electrons to form one of a plurality of streams of electrons; each of the rows of second means having characteristics for being energized to inhibit the formation of the streams of electrons associated with the energized row of second means; a plurality of fourth means each disposed in close proximity to an individual one of the columns of first means and having characteristics for being selectively energized to inhibit the formation of the cloud of electrons by the associated first means; whereby each of the electron flood guns is associated with one of the columns of the fourth means and one of the rows of second means so that a single stream of electrons is formed by energizing all but a particular column of the fourth means and all but a particular row of the second means.
Claim 10
Dependent Claim
266 words
A display tube having a plurality of electron flood guns at one end thereof for displaying a plurality of characters on a screen at the other end thereof, the electron flood guns comprising: a plurality of first means each disposed in columns wherein each column of first means provides one of a plurality of clouds of electrons for at least one of the flood guns; a plurality of second means disposed in rows between the first means and the screen, each of the rows of second means substantially enclosing a portion of each of the clouds of electrons provided by the first means; third means disposed between the second means and the screen and having properties for being energized to accelerate each of the portions of the clouds of electrons to form one of a plurality of streams of electrons; each of the rows of second means having characteristics for being energized to inhibit the formation of the streams of electrons associated with the energized row of second means; a plurality of fourth means each disposed in close proximity to an individual one of the columns of first means and having characteristics for being selectively energized to inhibit the formation of the cloud of electrons by the associated first means; whereby each of the electron flood guns is associated with one of the columns of the fourth means and one of the rows of second means so that a single stream of electrons is formed by energizing all but a particular column of the fourth means and all but a particular row of the second means.
Claim 11
Dependent Claim
85 words
The display tube as set forth in claim 8 wherein each of the second means comprises: a forward surface having a plurality of first apertures therein, each of the first apertures aligned between an associated one of the filaments and the screen; and a pair of side surfaces extending rearwardly from the edges of the forward surface, each side surface defining a plurality of second apertures wherein each of the first means extends through one of the second apertures in each of the side surfaces.
Claim 12
Dependent Claim
28 words
The display tube as set forth in claim 8 wherein each of the fourth means is disposed on the opposite side of the first means from the screen.
Claim 13
Dependent Claim
71 words
The display tube as set forth in claim 8 wherein each of the fourth means is energizable with a voltage of a first polarity to inhibit the formation of the cloud of electrons by the associated first means and is energizable with a voltage of a second polarity opposite to the first polarity to facilitate the formation of the cloud of electrons as a point source for movement to the screen.
Claim 14
Dependent Claim
64 words
The display tube recited in claim 11 wherein each of the fourth means comprises a longitudinal member extending substantially parallel to an individual one of the first means, the longitudinal member including a first portion defining a first plane including the associated filament where the first plane corresponds substantially to the direction in which the electrons move from the associated filament to the screen.
Claim 15
Dependent Claim
33 words
The display tube recited in claim 12 further including second portions in fixed relationship with the first portion and extending at least partially between the associated filament and one of the adjacent filaments.
Claim 16
Dependent Claim
22 words
The display tube recited in claim 13 wherein the longitudinal member has a cross section substantially the shape of the letter Y.
Claim 17
Dependent Claim
41 words
The display tube recited in claim 10 comprising: a second portion on the fourth means in fixed relationship with the first portion and extending in a second plane transverse to the first plane between the first portion and the associated filament.
Claim 18
Dependent Claim
126 words
An electron tube comprising: an envelope; a filament disposed at one of the ends of the envelope and having properties for being continuously energized to form a cloud of electrons in close proximity to the filament; first means spaced from the filament within the envelope and having characteristics for being energized to displace the cloud of electrons provided by the filament into a stream of electrons; second means disposed on the side of the filament opposite to the first means and in close proximity to the filament, and having characteristics for being energized in a first polarity to inhibit the formation of the cloud of electrons by the filament; whereby the stream of electrons is inhibited when the second means is energized in the first polarity.
Claim 19
Dependent Claim
126 words
An electron tube comprising: an envelope; a filament disposed at one of the ends of the envelope and having properties for being continuously energized to form a cloud of electrons in close proximity to the filament; first means spaced from the filament within the envelope and having characteristics for being energized to displace the cloud of electrons provided by the filament into a stream of electrons; second means disposed on the side of the filament opposite to the first means and in close proximity to the filament, and having characteristics for being energized in a first polarity to inhibit the formation of the cloud of electrons by the filament; whereby the stream of electrons is inhibited when the second means is energized in the first polarity.
Claim 20
Dependent Claim
88 words
The electron tube as recited in claim 16 further comprising: a display screen disposed at the end of the envelope opposite to the filament for receiving the stream of electrons and in response thereto displaying a character similar to the shape of the cross section of the stream of electrons; third means disposed between the first means and the display screen for providing the stream of electrons with a cross section in the shape of a particular character; whereby the particular character is displayed upon the display screen.
Claim 21
Dependent Claim
57 words
The electron tube as set forth in claim 17 wherein the second means has characteristics for being energized in a second polarity to augment the formation of the cloud of electrons by the filament and to restrict the size of the cloud of electrons so that the stream of electrons appears to emanate from a point source.
Claim 22
Dependent Claim
71 words
The electron tube defined in claim 18 further comprising: fourth means disposed between the filament and the first means and having characteristics for being energized in a first polarity to inhibit to effect of the first means upon the cloud of electrons formed by the filament, and for being energized in a second polarity to enhance the effect of the first means upon the cloud of electrons formed by the filament.
References Cited (Backward Citations)
US3432710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |