US3564121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Systems for modulation of beam-index color cathode ray tubes, and the like
Assignee: Individual
•
Filing: 1965-09-17
•
Granted: 1971-02-16
•
Expires: 1985-09-17
Abstract
Abstract A rear-ported beam index color cathode ray tube is described with a plurality of means for accurately controlling the modulation applied to the electrodes thereof in order to control the quality of data presented on the tube. Electrical and optical means are described which improve the signal to noise ratio in the index signal deriving section of the receiver. This improvement is achieved via the individual and collective action of (1) target screens having low x-ray emitting and high x-ray emitting index strips, and (2) large area scintillators for detecting and filtering the index radiation, and (3) electrical circuit means for generating synchronizing signals which respond to selected portions of the index radiation and (4) timing circuits for sequentially enabling the development of the synchronizing signals, and (5) circuit means which respond to the input data signals, deflection signals, and the synchronizing signals to precisely control the waveshapes of modulating signals applied to the cathode ray tube.
Inventors
- 👤 David M Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:53
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/22; H04N9/24
Claims Analysis
Total Claims: 71
Claim 1
Independent Claim
158 words
In a multicolor beam index display system comprising a source of data signals to be displayed in different colors; and image developing target screen with a plurality of strips of color producing and index signal producing elements; means for forming a scannable beam of energy; means for scanning said beam across the target screen, thereby to produce index signals indicative of the position on the target screen of said scanning beam; means for generating synchronizing signals responsive to the index signals; means for modulating the scanning beam responsive to said synchronizing signals and the data signals to be displayed, into a sequential train of pulses; the improvement comprising means responsive to said scanning means for controlling said modulating means so that pulses of the scanning beam of energy that are to impinge upon the outer regions of the target screen are relatively more narrow than those that are to impinge upon the inner regions of the target screen.
Claim 2
Dependent Claim
158 words
In a multicolor beam index display system comprising a source of data signals to be displayed in different colors; and image developing target screen with a plurality of strips of color producing and index signal producing elements; means for forming a scannable beam of energy; means for scanning said beam across the target screen, thereby to produce index signals indicative of the position on the target screen of said scanning beam; means for generating synchronizing signals responsive to the index signals; means for modulating the scanning beam responsive to said synchronizing signals and the data signals to be displayed, into a sequential train of pulses; the improvement comprising means responsive to said scanning means for controlling said modulating means so that pulses of the scanning beam of energy that are to impinge upon the outer regions of the target screen are relatively more narrow than those that are to impinge upon the inner regions of the target screen.
Claim 3
Dependent Claim
33 words
The combination of claim 1 wherein the target screen comprises a plurality of strips of different color producing elements disposed substantially at right angles to the scanning direction of the beam of energy.
Claim 4
Dependent Claim
7 words
means for scanning said beam of energy;
Claim 5
Dependent Claim
7 words
means for scanning said beam of energy;
Claim 6
Dependent Claim
7 words
means for scanning said beam of energy;
Claim 7
Dependent Claim
7 words
means for scanning said beam of energy;
Claim 8
Dependent Claim
18 words
a target screen having a plurality of different color-emitting regions disposed for scanning by said beam of energy;
Claim 9
Dependent Claim
18 words
a target screen having a plurality of different color-emitting regions disposed for scanning by said beam of energy;
Claim 10
Dependent Claim
21 words
a target screen having a plurality of different color-emitting striplike regions disposed for scanning in sequence by said beam of energy;
Claim 11
Dependent Claim
21 words
a target screen having a plurality of different color-emitting striplike regions disposed for scanning in sequence by said beam of energy;
Claim 12
Dependent Claim
39 words
The combinatioN of claim 1 wherein said means for modulating the scanning beam includes pulse modulating means for making the width of individual pulses of the scanning beam proportional to the intensity of the data signal to be displayed.
Claim 13
Dependent Claim
63 words
The combination of claim 1 including a cathode ray tube with an envelope and an electron gun, wherein the target screen is mounted within the envelope and the scannable beam of energy is an electron beam provided by the electron gun; including means responsive to the scanning means for focusing the electron beam as a function of its position on the target screen.
Claim 14
Dependent Claim
32 words
said target screen having means associated with said color-emitting striplike regions which provide first index signals in the form of pulses of electromagnetic radiation in response to excitation by the scanning beam;
Claim 15
Dependent Claim
32 words
said target screen having means associated with said color-emitting striplike regions which provide first index signals in the form of pulses of electromagnetic radiation in response to excitation by the scanning beam;
Claim 16
Dependent Claim
29 words
said target screen having means associated with said color-emitting regions which provide first index signals in the form of electromagnetic radiation in response to excitation by the scanning beam;
Claim 17
Dependent Claim
29 words
said target screen having means associated with said color-emitting regions which provide first index signals in the form of electromagnetic radiation in response to excitation by the scanning beam;
Claim 18
Dependent Claim
26 words
index-signal deriving means responsive to said radiation from the target screen for providing second index signals indicative of the position of the beam in the screen;
Claim 19
Dependent Claim
26 words
index-signal deriving means responsive to said radiation from the target screen for providing second index signals indicative of the position of the beam in the screen;
Claim 20
Dependent Claim
143 words
In a multicolor beam index display system comprising a source of data signals to be displayed in different colors; an image developing target screen with a plurality of strips of color producing and index signal producing elements; means for forming a scannable beam of energy; means for scanning said beam across the target screen, thereby to produce index signals indicative of the position on the target screen of said scanning beam; means for generating a train of sampling pulses from each trigger pulse; means responsive to said sampling pulses and the data signals for providing a train of modulating signals; and means for modulating the scanning beam with said modulating signals; the improvement comprising means responsive to said modulating signals for gating off said means for generating trigger pulses when the residual amplitude of the train of modulating signals exceeds a threshold value.
Claim 21
Dependent Claim
143 words
In a multicolor beam index display system comprising a source of data signals to be displayed in different colors; an image developing target screen with a plurality of strips of color producing and index signal producing elements; means for forming a scannable beam of energy; means for scanning said beam across the target screen, thereby to produce index signals indicative of the position on the target screen of said scanning beam; means for generating a train of sampling pulses from each trigger pulse; means responsive to said sampling pulses and the data signals for providing a train of modulating signals; and means for modulating the scanning beam with said modulating signals; the improvement comprising means responsive to said modulating signals for gating off said means for generating trigger pulses when the residual amplitude of the train of modulating signals exceeds a threshold value.
Claim 22
Dependent Claim
29 words
index signal deriving means responsive to said pulses of radiation from the target screen for providing second index signals; indicative of the position of the beam on the screen;
Claim 23
Dependent Claim
29 words
index signal deriving means responsive to said pulses of radiation from the target screen for providing second index signals; indicative of the position of the beam on the screen;
Claim 24
Dependent Claim
4 words
color signal source means;
Claim 25
Dependent Claim
4 words
color signal source means;
Claim 26
Dependent Claim
37 words
The combination of claim 5 including photomultiplier means responsive to said index signals for generating the trigger pulses, and means connecting the output of the gating off means to said photomultiplier thereby to controllably make it nonamplifying.
Claim 27
Dependent Claim
4 words
color signal source means;
Claim 28
Dependent Claim
4 words
color signal source means;
Claim 29
Dependent Claim
49 words
signal processing means, responsive to the color signals and to said second index signals, for modulating the scanning beam into a sequential train of pulses thereby to effectuate proper registry of the pulses of the scanning beam on the different color-emitting regions of the screen; the improvement comprising; and
Claim 30
Dependent Claim
49 words
signal processing means, responsive to the color signals and to said second index signals, for modulating the scanning beam into a sequential train of pulses thereby to effectuate proper registry of the pulses of the scanning beam on the different color-emitting regions of the screen; the improvement comprising; and
Claim 31
Dependent Claim
47 words
The combination of claim 5 including a photodetector responsive to said index signals for generating the trigger pulses, amplifier means responsive to the output of said photodetector, and means connecting the output of the gating off means to said amplifier means thereby to controllably make it nonamplifying.
Claim 32
Dependent Claim
21 words
signal processing means, responsive to the color signals and to said second index signals, for providing a train of modulating signals;
Claim 33
Dependent Claim
21 words
signal processing means, responsive to the color signals and to said second index signals, for providing a train of modulating signals;
Claim 34
Dependent Claim
73 words
means for modulating the scanning beam with said modulating signals; thereby modulating the scanning beam into a sequential train of pulses which for low intensity color signals have a duration which is less than the time required for the beam to traverse the color-emitting strip with which the pulse is associated, said scanning beam, first index signals, index-signal deriving means, signal processing means, and means for modulating the scanning beam introducing time delays;
Claim 35
Dependent Claim
73 words
means for modulating the scanning beam with said modulating signals; thereby modulating the scanning beam into a sequential train of pulses which for low intensity color signals have a duration which is less than the time required for the beam to traverse the color-emitting strip with which the pulse is associated, said scanning beam, first index signals, index-signal deriving means, signal processing means, and means for modulating the scanning beam introducing time delays;
Claim 36
Dependent Claim
40 words
The combination of claim 5 wherein the means for generating trigger pulses generally is gated in the off position, including means responsive to selected pulses in said train of sampling pulses for gating on said means for generating trigger pulses.
Claim 37
Dependent Claim
29 words
scintillator means in said index-signal deriving means responsive to said first index signals for providing intermediate optical index signals which differ in wavelength distribution from said first index signals.
Claim 38
Dependent Claim
29 words
scintillator means in said index-signal deriving means responsive to said first index signals for providing intermediate optical index signals which differ in wavelength distribution from said first index signals.
Claim 39
Dependent Claim
129 words
In a beam index color television display apparatus comprising a cathode ray tube with an electron gun including electrical connections thereto and a target screen; index signal deriving means comprising electron-sensitive index radiation emitting indicia on said target screen and means for detecting said index radiation; means responsive to said detection means for generating a train of pulses for controlling the modulation applied to said electron gun; the improvement comprising threshold means with input and output circuits, the input being in circuit with said electrical connections and the output being in circuit with said means for generating a train of pulses, whereby when the signal level on the input circuit exceeds a certain magnitude an output signal is generated which disables said means for generating the train of pulses.
Claim 40
Dependent Claim
129 words
In a beam index color television display apparatus comprising a cathode ray tube with an electron gun including electrical connections thereto and a target screen; index signal deriving means comprising electron-sensitive index radiation emitting indicia on said target screen and means for detecting said index radiation; means responsive to said detection means for generating a train of pulses for controlling the modulation applied to said electron gun; the improvement comprising threshold means with input and output circuits, the input being in circuit with said electrical connections and the output being in circuit with said means for generating a train of pulses, whereby when the signal level on the input circuit exceeds a certain magnitude an output signal is generated which disables said means for generating the train of pulses.
Claim 41
Dependent Claim
30 words
means for controlling the time delay to effectuate proper registry of the pulses of the scanning beam on the different striplike color-emitting regions of the screen; the improvement comprising; and
Claim 42
Dependent Claim
30 words
means for controlling the time delay to effectuate proper registry of the pulses of the scanning beam on the different striplike color-emitting regions of the screen; the improvement comprising; and
Claim 43
Dependent Claim
14 words
pulse-shaping means operative on said scanning beam modulating signals for providing trianglelike modulating signals.
Claim 44
Dependent Claim
14 words
pulse-shaping means operative on said scanning beam modulating signals for providing trianglelike modulating signals.
Claim 45
Dependent Claim
135 words
In a beam index line-screen color television display apparatus comprising a cathode ray tube with an electron gun for providing an electron beam and a target screen with a plurality of different color emitting striplike elements in register with a plurality of striplike index radiation emitting elements for indicating the position of the electron beam on the target screen; means for scanning the electron beam across the target screen; means for detecting said index radiation thereby to provide index pulses; and trigger pulse means responsive to said index pulses for controlling the excitation of the target screen; the improvement comprising means in said trigger pulse means for differentiating the index pulses to form a first control signal and means for developing a second control signal responsive to the zero-crossing portion of saId first control signal.
Claim 46
Dependent Claim
135 words
In a beam index line-screen color television display apparatus comprising a cathode ray tube with an electron gun for providing an electron beam and a target screen with a plurality of different color emitting striplike elements in register with a plurality of striplike index radiation emitting elements for indicating the position of the electron beam on the target screen; means for scanning the electron beam across the target screen; means for detecting said index radiation thereby to provide index pulses; and trigger pulse means responsive to said index pulses for controlling the excitation of the target screen; the improvement comprising means in said trigger pulse means for differentiating the index pulses to form a first control signal and means for developing a second control signal responsive to the zero-crossing portion of saId first control signal.
Claim 47
Dependent Claim
8 words
In a beam index multicolor display system comprising:
Claim 48
Dependent Claim
8 words
In a beam index multicolor display system comprising:
Claim 49
Dependent Claim
15 words
The combination of claim 11 wherein said scintillator means is transmissive of its own scintillations.
Claim 50
Dependent Claim
27 words
The combination of claim 12 wherein said scintillator has at least one broad surface, said surface being disposed on the scanning beam side of the target screen.
Claim 51
Dependent Claim
33 words
The combination of claim 13 wherein said scintillator has a second surface substantially parallel to said broad surface, including photosensitive means responsive to said optical index signals disposed adjacent to said second surface.
Claim 52
Dependent Claim
33 words
The combination of claim 13 wherein said scintillator has a second broad surface and at least one narrow edge, including photosensitive means responsive to said optical index signals disposed adjacent to said edge.
Claim 53
Dependent Claim
52 words
The combination of claim 11 including a cathode ray tube with a faceplate which supports the target screen, and an electron gun for furnishing the scannable beam; said target screen providing said first index signals in the form of ultraviolet radiation; and wherein said scintillator means is responsive to said ultraviolet radiation.
Claim 54
Dependent Claim
36 words
The combination of claim 16 wherein the cathode ray tube has an envelope with a funnel section, transmissive of said ultraviolet radiation, joined to said faceplate; and wherein said scintillator is disposed externally of the envelope.
Claim 55
Dependent Claim
58 words
The combination of claim 17 including an electrically conductive, optically opaque coating on the interior side of said funnel, with at least one window in said coating comprised of a series of spaced apart openings in said opaque coating, thereby to transmit said ultraviolet radiation externally of the envelope without substantially disturbing the electric field within the tube.
Claim 56
Dependent Claim
63 words
The combination of claim 11 wherein the first index signals decay at a first rate with a characteristic curve attributed thereto, after its excitation by the scanning beam ceases, and wherein the decay rate of said scintillator means is sufficiently fast to permit the intermediate optical index signals to follow the decay of the first index signals without substantially distorting said characteristic curve.
Claim 57
Dependent Claim
45 words
The combination of claim 19 including a cathode ray tube with a faceplate which supports the target screen, and an electron gun for furnishing the scannable beam, wherein the decay rate of said scintillator is faster than the decay rate of said first index signals.
Claim 58
Dependent Claim
18 words
The combination of claim 20 wherein said scintillator has a decay time constant of less than 20 nanoseconds.
Claim 59
Dependent Claim
28 words
The combination of claim 20 wherein said first index signals radiate in the ultraviolet region of the spectrum; and wherein said scintillator is responsive to the ultraviolet radiAtion.
Claim 60
Dependent Claim
18 words
The combination of claim 22 wherein said scintillator has a decay time constant of less than 10 nanoseconds.
Claim 61
Dependent Claim
160 words
In a beam index line-screen color cathode ray tube having an electron gun for furnishing a finely focused beam of electrons; and having a faceplate and a funnel shaped glass envelope joined thereto; and having a target screen mounted on said faceplate with a plurality of index signal emitting strips in register with a plurality of different color-emitting strips, wherein said index strips emit radiation in the optical wavelength range in response to excitation by the electron beam thereby to indicate the position of the beam on the screen; said funnel shaped glass envelope being transmissive of the optical index radiation; a coating of electrically conductive, optically opaque material on the interior surface of the glass envelope; the improvement comprising at least one window in said envelope comprised of a series of closely spaced openings in said coating for transmitting the optical index radiation externally of the tunnel of the envelope without substantially disturbing the electric field within the tube.
Claim 62
Dependent Claim
160 words
In a beam index line-screen color cathode ray tube having an electron gun for furnishing a finely focused beam of electrons; and having a faceplate and a funnel shaped glass envelope joined thereto; and having a target screen mounted on said faceplate with a plurality of index signal emitting strips in register with a plurality of different color-emitting strips, wherein said index strips emit radiation in the optical wavelength range in response to excitation by the electron beam thereby to indicate the position of the beam on the screen; said funnel shaped glass envelope being transmissive of the optical index radiation; a coating of electrically conductive, optically opaque material on the interior surface of the glass envelope; the improvement comprising at least one window in said envelope comprised of a series of closely spaced openings in said coating for transmitting the optical index radiation externally of the tunnel of the envelope without substantially disturbing the electric field within the tube.
Claim 63
Dependent Claim
9 words
In a beam index line-screen multicolor display system comprising:
Claim 64
Dependent Claim
9 words
In a beam index line-screen multicolor display system comprising:
Claim 65
Dependent Claim
56 words
The combination of claim 25 including means for increasing the amplitude of said trianglelike modulating signals in proportion to the intensity of the color to be displayed to the point where its duration at the base exceeds said time required for scanning, thereby to increase the brightness of the display with acceptable degradation of color purity.
Claim 66
Dependent Claim
23 words
The combination of claim 26 including means for converting said trianglelike modulating signal into a trapezoidallike modulating signals for high brightness color signals.
Claim 67
Dependent Claim
25 words
The combination of claim 25 including scintillator means in said signal deriving means responsive to said first index pulses for providing intermediate optical index signals.
Claim 68
Dependent Claim
24 words
The combination of claim 28 including means for detecting said optical index signals to provide electrical signals; and means for differentiating said electrical signal.
Claim 69
Dependent Claim
16 words
The combination of claim 29 including means for detecting the zero-crossing portion of the differentiated signal.
Claim 70
Dependent Claim
53 words
The combination of claim 28 including a cathode ray tube houSing the target screen and an electron gun for providing the scannable beam of energy; said target screen comprising means for generating said first index signals in the form of ultraviolet radiation; and wherein said scintillator means is disposed externally of the tube.
Claim 71
Dependent Claim
49 words
The combination of claim 31, wherein said scintillator is transmissive of its own radiation, has a broad surface area exposed to said first index signals and a narrow edge; including photodetection means responsive to said own radiation and disposed adjacent said narrow edge to receive the radiation emanating therefrom.
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |