Patent EP0049123A2 successfully refreshed from Google Patents.
EP0049123A2
Expired / Lapsed
EP
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Cathode ray tube convergence measuring system
Assignee: RCA Corp
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Filing: 1981-09-25
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Granted: —
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Expires: 2001-09-25
Abstract
Abstract A convergence measuring apparatus for e.g., a color television kinescope (19) and deflection yoke (20) comprises means (23, 45, 46) for activating two of the electron beams of the kinescope to generate a convergence test pattern on the kinescope display screen. The convergence test pattern is a set of alternating color patches (11, 12, 13). The degree of overlap (15) and gap (16) between patches is indicative of the degree of beam misconvergence. A monochrome television camera (21) observes the test pattern and provides a signal to a signal processor (22) which controls the electron beam activating means to move one color patch with respect to the other color to reduce the gap (16) and overlap (15) between patches. A measurement of the amount of patch movement necessary to minimize the overlap and gap between patches is an indication of electron beam misconvergence in the vicinity of the test pattern.
Inventors
- 👤 Donald Mackey
- 👤 Ernest Dewitt Fox
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 17:47
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/04
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
344 words
A convergence measurement apparatus for use with a color television display system, said display system comprising a kinescope having a display screen and three electron beam producing means, and a deflection yoke for deflecting said beams in horizontal and vertical directions to form a raster on said display screen, said apparatus characterized by: means (45) for activating one of said electron beam producing means to generate a first beam display area (12) on said kinescope display screen; means (46) for activating another of said beam producing means to generate second (11) and third (13) beam display areas on said kinescope display screen, said second (11) and third (13) display areas occurring on opposite boundaries of said first display area (12) and contiguous with said first display area upon occurrence of the convergence of said one and said other of said beams in the vicinity of said display areas, said first display area (12) overlapping one of said second or third display areas to form an overlap zone (15) and an associated gap zone (16) upon occurrence of the misconvergence of said one and said other of said beams; scanning means (21) for detecting the light emitted from said first (12), second (11), and third (13) display areas, and from said overlap (15) and gap (16) zones, if any, in a predetermined order; means (22) responsive to the output of said scanning means (21) for developing a signal indicative of the order of occurrence of said overlap (15) and gap (16) zones, if any, and having an amplitude representative of the width of said overlap and gap zones; means (35,53) responsive to said developed signal, for modifying one of said means (45,46) for activating said beam producing means, so as to effect a movement of said first beam display area with respect to said second and third beam display areas in a direction tending to reduce the amplitude of said developed signal; and means (26) for indicating the amount of motion of said first display area needed to minimize the amplitude of said developed signal.
Claim 2
Dependent Claim
344 words
A convergence measurement apparatus for use with a color television display system, said display system comprising a kinescope having a display screen and three electron beam producing means, and a deflection yoke for deflecting said beams in horizontal and vertical directions to form a raster on said display screen, said apparatus characterized by: means (45) for activating one of said electron beam producing means to generate a first beam display area (12) on said kinescope display screen; means (46) for activating another of said beam producing means to generate second (11) and third (13) beam display areas on said kinescope display screen, said second (11) and third (13) display areas occurring on opposite boundaries of said first display area (12) and contiguous with said first display area upon occurrence of the convergence of said one and said other of said beams in the vicinity of said display areas, said first display area (12) overlapping one of said second or third display areas to form an overlap zone (15) and an associated gap zone (16) upon occurrence of the misconvergence of said one and said other of said beams; scanning means (21) for detecting the light emitted from said first (12), second (11), and third (13) display areas, and from said overlap (15) and gap (16) zones, if any, in a predetermined order; means (22) responsive to the output of said scanning means (21) for developing a signal indicative of the order of occurrence of said overlap (15) and gap (16) zones, if any, and having an amplitude representative of the width of said overlap and gap zones; means (35,53) responsive to said developed signal, for modifying one of said means (45,46) for activating said beam producing means, so as to effect a movement of said first beam display area with respect to said second and third beam display areas in a direction tending to reduce the amplitude of said developed signal; and means (26) for indicating the amount of motion of said first display area needed to minimize the amplitude of said developed signal.
Claim 3
Dependent Claim
17 words
Apparatus according to Claim 1, characterized in that said scanning means comprises a monochrome television camera (21).
Claim 4
Dependent Claim
27 words
3, Apparatus according to any one of Claims 1 to 3 characterized in that said modifying means (35,53) is responsive to the polarity of said developed signal.
Claim 5
Dependent Claim
106 words
Apparatus according to Claim 1,2 or 3 characterized in that said signal developing means comprises: means (30) responsive to the output of said scanning means, for forming a pulse having a substantially constant amplitude, having a polarity representative of the order of occurrence of said overlap and gap zones, if any, and having a width representative of the width of said overlap and gap zones; and means (34) for integrating said pulse to form said developed signal having a polarity representative of the order of occurrence of said overlap and gap zones and having an amplitude representative of the width of said overlap and gap zones.
Claim 6
Dependent Claim
52 words
5 . Apparatus according to . any one of Claims 1 to 4, characterized in that said second (11) and third (13) beam display areas occur on opposite sides of said first beam display area (12) such that said first (12), second (11) and third (13) beam display areas are horizontally aligned.
Claim 7
Dependent Claim
156 words
Apparatus according to Claim 5, characterized in that said signal developing means comprises: means (33) for delaying the output of said scanning means by a time interval substantially equal to the time required to scan the width of one of said beam display areas to form a second scanned signal; gated combining means (30,32) responsive to the outputs of said scanning means (21) and said delaying means (33), for forming a combined signal comprising a signal (Claim 3 continued): component having a substantially constant amplitude, having a polarity representative of the order of occurrence of said overlap and gap zones and having a width representative of the width of said overlap and gap zones; and means (34) for integrating said combined signal to form said developed signal having a polarity representative of the order of occurrence of said overlap and gap zones and having an amplitude representative of the width of said overlap and gap zones.
Claim 8
Dependent Claim
43 words
7 . Apparatus according to Claim 1, 2 or 3 characterized in that said second and third beam display areas occur respectively above and below said first beam display area such that said first, second and third beam display areas are vertically aligned.
Claim 9
Dependent Claim
146 words
Apparatus according to claim 7, characterized in that said signal developing means comprises: means (36), responsive to the output of said scanning means (21), for generating a first scanned signal comprising signal components corresponding to respective overlap and gap zones, each of said signal components having a substantially constant amplitude, having a width representative of the width of said respective overlap and gap zones, and having a polarity indicative of one of said respective overlap and gap zones; means (41) for modifying said first scanned signal by inverting said signal during the last half of its duration to form a second scanned signal; and means (50) for integrating said second scanned signal to generate said developed signal having a polarity indicative of the order of occurrence of said overlap and gap zones and having an amplitude representative of the width of said overlap and gap zones.
Claim 10
Dependent Claim
34 words
9 . Apparatus according to claim 1 or 2 characterized in that said opposite boundaries of said first display area are inclined relative to the vertical and horizontal axes of said kinescope display screen.
Claim 11
Dependent Claim
74 words
Apparatus according to claim 1 or 2, characterized in that said means for activating one of said electron beams additionally produces a fourth beam display area on said kinescope display screen, said first and fourth display areas occurring on opposite boundaries of said third display area and contiguous with said third display area upon occurrence of the convergence of said one and said other of said beams in the vicinity of said display areas.
Claim 12
Dependent Claim
117 words
Apparatus according to claim 10, characterized in that said scanning means produces a signal incorporating respective signal components of a first polarity indicative of the presence of each of said overlap zone occurrences, if any, and respective signal components of a second polarity indicative of the presence of each of said gap zone occurrences, if any; and wherein said signal developing means incorporates means for indicating the order of occurrence of said overlap and gap zones comprising: means for determining the number of signal components having a predetermined one of said first or second polarities; and means, responsive to the output of said determining means, for indicating the order of occurrence of said overlap and gap zones.
Claim 13
Dependent Claim
198 words
Apparatus for measuring the convergence of a cathode ray tube display having a display screen for displaying at least two colors, at least two electron beam producing means associated with the respective colors, and a deflection yoke for simultaneously deflecting the beams along the same scanning pattern, the apparatus comprising, means for causing two of the beams to simultaneously display respective differently colored areas having predetermined luminances in selectable positions on the screen which areas are chosen to be contiguous for correct convergence but which overlap or are spaced when misconvergence occurs, means for scanning the displayed areas according to a preset pattern for producing a signal representing the luminance of the areas along that preset pattern, and means for processing said luminance signal to derive from the departure due to overlap or spacing of the areas, of the luminance from said predetermined luminances signals indicative of the misconvergence and of the direction of misconvergence, and means responsive to said indicative signals to move one of the patches relative to the other so as to minimize the misconvergence represented thereby, and for deriving the measure of misconvergence from the amount of said movement required to minimize the misconvergence.
Claim 14
Dependent Claim
198 words
Apparatus for measuring the convergence of a cathode ray tube display having a display screen for displaying at least two colors, at least two electron beam producing means associated with the respective colors, and a deflection yoke for simultaneously deflecting the beams along the same scanning pattern, the apparatus comprising, means for causing two of the beams to simultaneously display respective differently colored areas having predetermined luminances in selectable positions on the screen which areas are chosen to be contiguous for correct convergence but which overlap or are spaced when misconvergence occurs, means for scanning the displayed areas according to a preset pattern for producing a signal representing the luminance of the areas along that preset pattern, and means for processing said luminance signal to derive from the departure due to overlap or spacing of the areas, of the luminance from said predetermined luminances signals indicative of the misconvergence and of the direction of misconvergence, and means responsive to said indicative signals to move one of the patches relative to the other so as to minimize the misconvergence represented thereby, and for deriving the measure of misconvergence from the amount of said movement required to minimize the misconvergence.
Claim 15
Dependent Claim
98 words
Apparatus according to claim 12, wherein the indicative signals represent the amount and direction of misconvergence, and the responsive means is responsive to said indicative signals to move one of said areas by a sufficient number of preset steps to cause the direction of misconvergence to reverse counts the number of steps, derives the fractional misconvergence present at the step at which said direction reverses from the values of signals indicative of the amount of misconvergence associated with that step and the previous step, and produces the said measure from the number of steps and the fractional misconvergence.
Claim 16
Dependent Claim
117 words
Apparatus according to claim 12 or 13, wherein the causing means causes the said beams to display at least three areas alternating in the colors associated with the beams, the areas of the same colors being spaced by a preset width and the areas being contiguous for correct convergence and producing a pattern comprising a gap and an overlap characteristic of any misconvergence, and the processing means forms the integral of a combination of the luminance signal portion of the representing one of said gap and overlap and the portion of the same signal representing the other of said gap and overlap in inverted form so as to produce an integrated value representing the amount of misconvergence.
Claim 17
Dependent Claim
63 words
Apparatus according to claim 14, wherein the processing means comprises combining means, means for delaying and inverting the luminance signal so that the said portion representing one of the gap and overlap is present at the combining means at the same time as the said portion representing the other of the gap and overlap, and wherein the combining means forms the said integral.
Claim 18
Dependent Claim
25 words
Apparatus according to claim 15, wherein the combining means comprises a summer for summing the said portions and an integrator for integrating the resultant sum.
Claim 19
Dependent Claim
43 words
Apparatus according to claim 14, wherein the processing means comprises an integrator, and means for providing one of the said portions and the other of the said portions sequentially to the integrator which integrates and combines them to form the said integrated value.
Claim 20
Dependent Claim
33 words
Apparatus according to any one of claims 12 to 17, further comprising means responsive to the indicative signals to adjust the convergence of an assembly of the cathode ray tube and the yoke.
Claim 21
Dependent Claim
63 words
Apparatus according to one one of claims 12 to 18, wherein the said preset pattern comprises a TV raster having a plurality of scanning lines through the displayed areas, and the processing means averages the indications of misconvergence over all said lines through the pattern, and the responsive means causes said relative movement at the completion of the scanning through the displayed areas.
References Cited (Backward Citations)
No citation records indexed.
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