US3742276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube with rear projection readout
Assignee: ELECTRONIC ENG Inc IND
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Filing: 1972-03-30
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Granted: 1973-06-26
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Expires: 1992-03-30
Abstract
Abstract A display tube for selectively providing a visual display of a plurality of characters, including a vacuum envelope with a display screen at one end thereof and a plurality of columns of first means providing a source of electrons at the other end thereof. An apertured mask disposed between the first means and the display screen energizable to accelerate the electrons into a different stream of electrons for each of the characters. A plurality of rows of grid control boxes disposed between the first means and the apertured mask each of the rows controlling a portion of the electrons provided by each of the columns of first means by inhibiting the effect of the apertured mask on the controlled portions. The rows of grid control boxes and columns of first means individually energizable so that a single stream of electrons is accelerated and a single one of the characters is displayed, wherein the number of characters displayable is equal to the product of the number of rows and the number of columns.
Inventors
- 👤 D Gumpertz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:53
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/16
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
294 words
A display tube for selectively providing a visual display of a plurality of characteris, comprising: an envelope having a display screen including fluorescent particles at one end thereof; a plurality of first means each providing a source of electrons, the first means disposed within the envelope at the end thereof opposite the display screen and arranged in at least a pair of rows and a pair of columns transverse to the rows to direct the electrons toward the display screen; second means disposed relative to the first means for forming into a stream of electrons the electrons provided by each of the first means, the second means accelerating the electrons in the direction of the display screen whereby the electrons impinge upon the fluorescent particles to illuminate the display screen; third means providing each of the streams of electrons generated by the second means with a cross section which is similar to the shape of an individual one of the characters so that the display screen is illuminated in the shape of the individual character; fourth means included in the first means and having characteristics for selectively controlling the formation of the streams of electrons associated with a particular column of the first means; fifth means included in the first means and having characteristics for selectively controlling the formation of the streams of electrons associated with a particular row of the first means; whereby a particular stream of electrons associated with the particular column and the particualr row of the first means is generated by the second means so that the particular character associated with the particular stream of electrons is displayed by the second means so that the particular character associated with the particular stream of electrons is displayed by the display screen.
Claim 2
Dependent Claim
294 words
A display tube for selectively providing a visual display of a plurality of characteris, comprising: an envelope having a display screen including fluorescent particles at one end thereof; a plurality of first means each providing a source of electrons, the first means disposed within the envelope at the end thereof opposite the display screen and arranged in at least a pair of rows and a pair of columns transverse to the rows to direct the electrons toward the display screen; second means disposed relative to the first means for forming into a stream of electrons the electrons provided by each of the first means, the second means accelerating the electrons in the direction of the display screen whereby the electrons impinge upon the fluorescent particles to illuminate the display screen; third means providing each of the streams of electrons generated by the second means with a cross section which is similar to the shape of an individual one of the characters so that the display screen is illuminated in the shape of the individual character; fourth means included in the first means and having characteristics for selectively controlling the formation of the streams of electrons associated with a particular column of the first means; fifth means included in the first means and having characteristics for selectively controlling the formation of the streams of electrons associated with a particular row of the first means; whereby a particular stream of electrons associated with the particular column and the particualr row of the first means is generated by the second means so that the particular character associated with the particular stream of electrons is displayed by the second means so that the particular character associated with the particular stream of electrons is displayed by the display screen.
Claim 3
Dependent Claim
85 words
The display tube recited in claim 1, further comprising: at least a pair of filaments included in the first means each of the filaments having characteristics for being energized to provide a source of electrons for at least one of the columns of the first means; and a plurality of first switching means included in the fourth means each of the first switching means in series with one of the filaments for selectively energizing the filament associated with the particular column of the first means.
Claim 4
Dependent Claim
85 words
The display tube as defined in claim 2 wherein the fifth means includes: a plurality of control boxes electrically connected to form at least a pair of control bars, each control box having characteristics for substantially enclosing a portion of the electrons provided by an associated one of the filaments; and second switching means electrically connected to one of the control boxes in each of the control bars for selectively energizing all but the control bar associated with the particular row of the first means.
Claim 5
Dependent Claim
258 words
A display tube for selectively providing a visual display of a plurality of characters, comprising: an envelope having a display screen including fluorescent particles at one end thereof; a plurality of filaments disposed in columns relative to the display screen to direct electrons to the display screen, each filament having characteristics for being energized to provide a source of electrons; first means for selectively energizing a particular one of the filaments so that the particular filament is a source of electrons; a plurality of second means disposed in rows relative to the filaments, each of the second means substantially controlling a different portion of the electrons provided by each of the energized filaments, each of the second means having for each of the portions of electrons controlled thereby an aperture disposed between the associated filament and the display screen; third means for selectively energizing all but a particular one of the second means to control the passage of the electrons Through the apertures in the energized second means in accordance with such selective energizings; and fourth means disposed between the second means and the display screen and having characteristics for being energized to displace from the first means in a stream of electrons the portion of electrons associated with the particular filament and the particular second means, the fourth means accelerating the electrons in the direction of the display screen and having characteristics to control the illumination of the fluorescent particles by the electrons passing through the second means in accordance with a particular one of the characters.
Claim 6
Dependent Claim
258 words
A display tube for selectively providing a visual display of a plurality of characters, comprising: an envelope having a display screen including fluorescent particles at one end thereof; a plurality of filaments disposed in columns relative to the display screen to direct electrons to the display screen, each filament having characteristics for being energized to provide a source of electrons; first means for selectively energizing a particular one of the filaments so that the particular filament is a source of electrons; a plurality of second means disposed in rows relative to the filaments, each of the second means substantially controlling a different portion of the electrons provided by each of the energized filaments, each of the second means having for each of the portions of electrons controlled thereby an aperture disposed between the associated filament and the display screen; third means for selectively energizing all but a particular one of the second means to control the passage of the electrons Through the apertures in the energized second means in accordance with such selective energizings; and fourth means disposed between the second means and the display screen and having characteristics for being energized to displace from the first means in a stream of electrons the portion of electrons associated with the particular filament and the particular second means, the fourth means accelerating the electrons in the direction of the display screen and having characteristics to control the illumination of the fluorescent particles by the electrons passing through the second means in accordance with a particular one of the characters.
Claim 7
Dependent Claim
101 words
The display tube as recited in claim 4 further comprising: the energized fourth means creating first lines of force disposed relative to the apertures of the particular second means to displace the portion of electrons associated with the particular filament; the energized second means creating second lines of force having a polarity opposite that of the first lines of force and having at the apertures a magnitude greater than the magnitude of the first lines of force; whereby the first lines of force are inhibited from passing through the apertures of the energized second means to displace the electron enclosed thereby.
Claim 8
Dependent Claim
49 words
A display tube as defined in claim 5 wherein the apertures are provided with a diameter sufficiently small to minimize the width of the first lines of force passing therethrough so that the free electrons in transit along the first line of force appear to emante from a point.
Claim 9
Dependent Claim
105 words
A display tube as defined in claim 5 wherein the second means are aligned with the fourth means so that the centermost portions of the cross sections of the respective streams of electrons coincide with the center of the display screen and the outermost portions of their cross sections tend to cross over at a particular distance from the second means, the display tube further comprising sixth means disposed between the second means and the fourth means for maximizing the particular distance so that the distance between the fourth means and the display screen can be minimized to decrease the amplification of the particular character.
Claim 10
Dependent Claim
56 words
A display tube as recited in claim 7 wherein the sixth means comprises: a mask having portions thereof defining a plurality of apertures therein through which each of the streams of electrons respectively passes, the apertures being substantially rectangular to shape the outermost portions of the streams of electrons so as to maximize the particular distance.
Claim 11
Dependent Claim
246 words
In combination for selectively providing a visual indication of a plurality of characters comprising: an envelope having a display screen at a forward end thereof; at least a pair of filaments disposed interiorly of the envelope at a rear end thereof and disposed relative to each other in a configuration corresponding to the configuration of the display screen, each of the filaments being energizable to form an individual cloud of electrons; at least a pair of grid control bars each disposed in transverse relationship to the filaments and in a particular spacing relative to the filaments, and energizable to provide first characteristics for inhibiting the movement of a particular portion of the cloud of electrons from the associated energized filament and to provide second characteristics for facilitating the movement of the particular portion of the cloud of electrons from the associated energized filament; a first mask having a plurality of first apertures disposed between the grid control bars and the display screen and in a particular spacing relative to the grid control bars, the first mask being energizable to create a first electrical field having first lines of force relative to at least a particular one of the filaments for accelerating in the direction of the display screen at least one stream of the electrons not inhibited by the grid control bars; whereby the accelerated electRons in each of the streams of electrons impinge upon the display screen to display at least one of the characters.
Claim 12
Dependent Claim
246 words
In combination for selectively providing a visual indication of a plurality of characters comprising: an envelope having a display screen at a forward end thereof; at least a pair of filaments disposed interiorly of the envelope at a rear end thereof and disposed relative to each other in a configuration corresponding to the configuration of the display screen, each of the filaments being energizable to form an individual cloud of electrons; at least a pair of grid control bars each disposed in transverse relationship to the filaments and in a particular spacing relative to the filaments, and energizable to provide first characteristics for inhibiting the movement of a particular portion of the cloud of electrons from the associated energized filament and to provide second characteristics for facilitating the movement of the particular portion of the cloud of electrons from the associated energized filament; a first mask having a plurality of first apertures disposed between the grid control bars and the display screen and in a particular spacing relative to the grid control bars, the first mask being energizable to create a first electrical field having first lines of force relative to at least a particular one of the filaments for accelerating in the direction of the display screen at least one stream of the electrons not inhibited by the grid control bars; whereby the accelerated electRons in each of the streams of electrons impinge upon the display screen to display at least one of the characters.
Claim 13
Dependent Claim
29 words
The combination as recited in claim 9, the filaments being longitudinal in configuration and substantially parallel to each other and the grid control bars being substantially arcuate in configuration.
Claim 14
Dependent Claim
51 words
The combination as recited in claim 10, each of the grid control bars being disposed between the filaments and the display screen and being individually energizable to provide second characteristics for reinforcing the first lines of force produced by the first mask on the clouds of electrons provided by the filaments.
Claim 15
Dependent Claim
95 words
The combination as recited in claim 9 further comprising: a plurality of grid control bars elongated in configuration and disposed substantially parallel to the other grid control bars with portions of the grid control bars extending between the filaments and the first mask; each of the grid control bars enclosing a portion of the cloud of electrons formed by each of the energized filaments, and the grid control bars being selectively energizable to create a second electrical field having second lines of force resisting the acceleration of the electrons by the first lines of force.
Claim 16
Dependent Claim
78 words
The combination as recited in claim 12 further comprising: a plurality of partitions disposed within each of the grid control boxes to form a plurality of compartments each having an open side facing rearwardly of the screen and a side defining a second aperture facing toward the screen, each of the compartments substantially enclosing one of the portions of the clouds of electrons; whereby second lines of force inhibit the acceleration of the electrons through the second apertures.
Claim 17
Dependent Claim
64 words
The combination recited in claim 9 including: means for individually energizing the filaments; means for individually energizing the grid control bars to provide individual ones of the bars with the first characteristics at first particular times and with the second characteristics at second particular times different from the first particular times; and means for energizing the first mask to create the first electrical field.
Claim 18
Dependent Claim
30 words
The combination recited in claim 13 wherein the second apertures in one grid control boxes are equally spaced from the associated filament and are equally spaced from the first mask.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |