DE756470C - Circuit arrangement for storing cathode ray scanner - Google Patents
Circuit arrangement for storing cathode ray scannerInfo
- Publication number
- DE756470C DE756470C DER97950D DER0097950D DE756470C DE 756470 C DE756470 C DE 756470C DE R97950 D DER97950 D DE R97950D DE R0097950 D DER0097950 D DE R0097950D DE 756470 C DE756470 C DE 756470C
- Authority
- DE
- Germany
- Prior art keywords
- image
- cathode ray
- circuit arrangement
- line
- ray scanner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/021—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof arrangements for eliminating interferences in the tube
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/68—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more dc dynamo-electric motors
- H02P5/69—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more dc dynamo-electric motors mechanically coupled by gearing
- H02P5/695—Differential gearing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/40—Circuit details for pick-up tubes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/06—Generation of synchronising signals
- H04N5/067—Arrangements or circuits at the transmitter end
- H04N5/0675—Arrangements or circuits at the transmitter end for mixing the synchronising signals with the picture signal or mutually
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Picture Signal Circuits (AREA)
Description
AUSGEGEBEN AM 17. JULI 1952ISSUE JULY 17, 1952
REICHSPATENTAMTREICH PATENT OFFICE
PATENTSCHRIFTPATENT LETTERING
KLASSE 21a1 GRUPPE 3511CLASS 21a 1 GROUP 3511
R 9/P5O Villa/2ia1 R 9 / P5O Villa / 2ia 1
Radio Corporation of America, New York (V. St. A.)Radio Corporation of America, New York (V. St. A.)
Schaltungsanordnung für speichernde KathodenstrahlabtasterCircuit arrangement for storing cathode ray scanner
Zusatz zum Patent 652Addition to patent 652
Patentiert im Deutschen Reich vom 30. Mai 1935 anPatented in the German Reich on May 30, 1935
Das Hauptpatent hat angefangen am 26. Januar 1934The main patent started on January 26, 1934
Patenterteilung bekanntgemacht am 5. Oktober 1944Patent granted on October 5, 1944
Bei einem Kathodenstrahlbildabtaster mit Speicherwirkung ist es notwendig, den abtastenden, Kathodenstrahl, nachdem eine Zeile bzw. das Bildfeld durchlaufen ist, für die Abtastung der nächsten Zeile bzw. für die Erzeugung des nächsten Bildes bzw. des nächsten Zeifenzuges bei der Zeilensprungabtastung zurückzubewegen. Insbesondere während dieses Rücklaufs in der Bildwechselrichtung muß dabei der Abtaststrahl gesperrt werden. Nun beobachtet man aber, selbst wenn man für beide Koordinatemrichtungen während der Rücklaufzeit den Strahl unterbricht, was durch Anlegen einer entsprechenden negativen Spannung an die Steuerelektrode dös Abtaststrahlrohres geschehen kann, daß der Bildverstärker außer den Bildsignalen 142 Störspannungen 146 bzw. 150 liefert, wie sie in Abb. 1 dargestellt sind. Die Zeilendauer ist dort mitT1 bezeichnet und mit t die Zeit, für welche der Abtaststrahl nach Beendigung einer Zeilenabtastung gesperrt wird.In the case of a cathode ray scanner with a memory effect, it is necessary to move the scanning cathode ray back after a line or the image field has been scanned for the next line or for the generation of the next image or the next line of lines in interlaced scanning. The scanning beam must be blocked, particularly during this return movement in the image change direction. Now one observes, however, even if the beam is interrupted for both coordinate directions during the return time, which can be done by applying a corresponding negative voltage to the control electrode of the scanning beam tube, that the image intensifier supplies, in addition to the image signals 142, interference voltages 146 and 150, as shown in FIG Fig. 1 are shown. The line duration is denoted there with T 1 and with t the time for which the scanning beam is blocked after completion of a line scan.
Im Hauptpatent 652 313 ist bereits vorgeschlagen worden, diese Störspannungen dadurch zu beseitigen, daß senderseitig zu demIn the main patent 652 313 it has already been proposed to reduce these interference voltages to eliminate that on the transmitter side to the
vom Bildabtaster gelieferten Spannungsgemisch die Synchronisierimpulse für den Zeilen- und den Bildwechsel mit derartiger Polarität und Amplitude zugesetzt werden, daß die in den Zeilen- und Bildwechselpausen auf tretenden Störspannungen sich nach der Richtung schwarzer Bildstellen hin verschieben und dann mittels einer Amplitudenbegrenzungsstufe abgeschnitten werden. Insbesondere ίο treten derartige Störspaniiungen 150 dann auf, ; wenn man Filmbilder überträgt, welche in bekannter Weise während des Rücklaufs des Abtaststrahles entgegen der Bildabtastrichtung j intermittierend auf den Abtaster projiziert werden. Die Entstehungsursachen für diese Störspannungen sind nicht bekannt. Es ist jedoch bemerkenswert, daß sie sich nicht auf die Zeit der Strahlsperrung währenddes Rücklaufs beschränken, sondern darüber hinaus andauern.the mixed voltage supplied by the image scanner, the synchronizing pulses for the line and the image changes are added with such polarity and amplitude that the in the line and image change pauses occur Interference voltages shift in the direction of black image areas and then by means of an amplitude limiting stage be cut off. In particular ίο such interference voltages 150 then occur; if you transfer film images, which in a known manner during the rewind of the Scanning beam projected intermittently onto the scanner counter to the image scanning direction j will. The causes of these interference voltages are not known. It is however noteworthy that it does not affect the time of beam blocking during retrace limit, but persist beyond that.
Die Erfindung befaßt sich nun mit dem Problem, diese Störspannungen zu eliminieren. Zu diesem Zweck werden zu den vom Bildverstärker gelieferten Strömen, die in Abb. 1 so· dargestellt sind, wie sie am Ausgang des Bildverstärkers auftreten, und in Abb. 2 so, wie sie im Anodenkreis einer an den Bildverstärker angeschlossenen, lediglich zur Phasenumkehr dienenden Röhre zu beobachten sind, Stromimpulse addiert, die mit dem Bildwechsel- bz\v. Zeilenzugwechselrücklauf des Abtaststrahles beginnen, aber so- viel langer dauern als dieser, daß die am Bildrand auftretenden Störspannungen beseitigt werden. An Stelle des Synchronisierimpulses für den Bild- bzw. Zeilenzugwechsel, wie im Hauptpatent vorgeschlagen, soll also gemäß der vorliegenden Erfindung ein längerer Impuls zugefügt werden. ■ 1 Dies geht im einzelnen beispielsweise fol- j gendermaßen vor sich. In Abb. 3 ist die an | den Bildverstärker 137 eines speichernden Kathodenistrahlbildabtasters 10 mit einseitigem photoelektrischem Mosaikschirm 14 an- j geschlossene, zur Phasenumkehr dienende Röhre mit 94 bezeichnet. Zu dem Spannuugs- j verlauf gemäß Abb. 2 im Anodenkreis der ' Röhre 94 werden über die Leitung 122 Im- \ pulse 144, 148 nach Abb. 4, welche die Strahl- ί sperrung bewirken, und Impulse 152 nach Abb. 5 addiert, welche gleichzeitig mit den ; Impulsen 148 für die Sperrung des Kathodenstrahles in der Bildwechselpause beginnen, aber länger als diese dauern. Die Summe, d.h. die Spannung am Gitter der Röhrego hat sodann den in Abb. 6 dargestellten Verlauf. Die Spannung im Anodenkreis der Röhre 96, welche eine Phasenumkehr der Spannungskurve nach Abb. 0 bewirkt, verläuft somit so, ßo wie in Abb. 7 dargestellt. Da die Röhre 98 >o stark vorgespannt ist, daß Spannungen unterhalb der Linie 160 in Abb. 7 keinen Anodenstrom hervorrufen, entsteht im Anodenkreis der Röhre 98 eine Spannung gemäß Abb. 8. In dieser sind die Störspannungen 146 und 150 der Abb. 2 bereits zum größten Teil unterdrückt. Die etwa noch λόγ-händeneii Reste während der Zeiten t in Abb. 8 lassen sich nach demselben Prinzip mittes einer Röhre 100, welche zunächst eine Phasenumkehr bewirkt und deren Anodenkreis somit eine Spannung gemäß Abb. 9 liefert, und einer weiteren, entsprechend der punktierten Linie 162 vorgespannten Röhre 102 völlig eliminieren. Im Anodenkreis der Röhre 102 entsteht dann die in Abb. 10 dargestellte, von allen Störspannungen restlos befreite Spannung. Man hat nun lediglich dieser Spannung gegebenenfalls noch in bekannter Weise die der mittleren Bildhelligkeit ■entsprechende Gleichspannung, die Zeileuimpulse und Bildwechselimpulse zu addieren, was am Widerstand 90 geschieht, um eine Spannung zu erhalten, die zur Modulation eines Hochfrequenzsenders 168 benutzt werden kann.The invention is now concerned with the problem of eliminating these interference voltages. For this purpose, the currents supplied by the image intensifier, which are shown in Fig. 1 as they occur at the output of the image intensifier, and in Fig. 2 as they are in the anode circuit of one connected to the image intensifier, are used only for phase reversal Tube are to be observed, current pulses are added, which with the image change or \ v. Line train change return of the scanning beam begin, but last so much longer than this that the interference voltages occurring at the edge of the image are eliminated. Instead of the synchronization pulse for the picture or line change, as suggested in the main patent, a longer pulse is to be added according to the present invention. ■ 1 In detail, for example, this takes place as follows. In Fig. 3 the an | The image intensifier 137 of a storing cathode ray image scanner 10 with a one-sided photoelectric mosaic screen 14 connected to a tube serving for phase reversal is denoted by 94. To the Spannuugs- j extending according to Fig. 2 in the anode circuit of the 'tube 94 are added via line 122 Im- \ pulse 144, 148 according to Fig. 4 which cause the beam ί disable, and pulses 152 as shown in Fig. 5, which at the same time with the; Pulses 148 for blocking the cathode ray begin in the picture change pause, but last longer than this. The sum, ie the voltage on the grid of the Röhrego, then has the curve shown in Fig. 6. The voltage in the anode circuit of the tube 96, which causes a phase reversal of the voltage curve according to FIG. 0, thus runs as shown in FIG. 7. Since the tube 98 is> o strongly biased to voltages do not produce an anode current below line 160 in Fig. 7, in the anode circuit already formed of the tube 98 a voltage according to Fig. 8. In this, the noise voltages 146 and 150 of Fig. 2 mostly suppressed. The approximately λόγ-hand-held remainders during the times t in Fig. 8 can be traced according to the same principle by means of a tube 100, which initially causes a phase inversion and whose anode circuit thus supplies a voltage according to Fig. 9, and another, according to the dotted line 162 completely eliminate pretensioned tube 102. In the anode circuit of the tube 102, the voltage shown in Fig. 10 is created, completely freed from all interference voltages. You only have to add the DC voltage corresponding to the average image brightness, the new line pulses and the image change pulses to this voltage, if necessary in a known manner.
Die zu den Bildsignalströmen zu addierenden Stromimpulse 152 können gemäß einem weiteren Merkmal der Erfindung von derselben Lochscheibe geliefert werden, welche die zur Strahlsperrung dienenden Impulse 144 und 148 erzeugt. Auch die Zeilenimpulse und Zeilenzug- bzw. Bildwechselimpulse können von der gleichen Lochscheibe erzeugt werden.The current pulses 152 to be added to the image signal currents can according to a Another feature of the invention can be provided by the same perforated disc which the beam blocking pulses 144 and 148 are generated. Also the line pulses and Line pull or image change pulses can be generated by the same perforated disk.
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US422658XA | 1933-01-28 | 1933-01-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE756470C true DE756470C (en) | 1952-07-17 |
Family
ID=21920935
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DER89745D Expired DE652313C (en) | 1933-01-28 | 1934-01-26 | Circuit arrangement for cathode ray scanner with storage electrode |
DER97950D Expired DE756470C (en) | 1933-01-28 | 1935-05-30 | Circuit arrangement for storing cathode ray scanner |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DER89745D Expired DE652313C (en) | 1933-01-28 | 1934-01-26 | Circuit arrangement for cathode ray scanner with storage electrode |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE403568A (en) |
DE (2) | DE652313C (en) |
FR (1) | FR767294A (en) |
GB (1) | GB422658A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE968685C (en) * | 1934-07-31 | 1958-03-20 | Fernseh Gmbh | Method for synchronizing picture and television broadcasts |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE403568A (en) * | 1933-01-28 | |||
BE411923A (en) * | 1934-10-26 | |||
DE755468C (en) * | 1934-11-06 | 1954-11-22 | Opta Radio A G | Circuit arrangement for generating blocking pulses for beam suppression in television cathode ray tubes |
US2232044A (en) * | 1936-11-28 | 1941-02-18 | Rca Corp | Television system |
GB501966A (en) * | 1937-06-07 | 1939-03-07 | Alan Dower Blumlein | Improvements in or relating to television systems |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB350371A (en) * | 1929-11-16 | 1931-06-11 | British Thomson Houston Co Ltd | Improvements in and relating to the transmission of pictures |
CH164055A (en) * | 1931-08-15 | 1933-09-15 | Rca Corp | Method and apparatus for receiving telegraphically or radiotelegraphically transmitted still or moving pictures using a cathode ray tube. |
FR767294A (en) * | 1933-01-28 | 1934-07-13 | Rca Corp | Improvements to television systems |
-
0
- BE BE403568D patent/BE403568A/xx unknown
-
1934
- 1934-01-19 FR FR767294D patent/FR767294A/en not_active Expired
- 1934-01-26 DE DER89745D patent/DE652313C/en not_active Expired
- 1934-01-29 GB GB3032/34A patent/GB422658A/en not_active Expired
-
1935
- 1935-05-30 DE DER97950D patent/DE756470C/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB350371A (en) * | 1929-11-16 | 1931-06-11 | British Thomson Houston Co Ltd | Improvements in and relating to the transmission of pictures |
CH164055A (en) * | 1931-08-15 | 1933-09-15 | Rca Corp | Method and apparatus for receiving telegraphically or radiotelegraphically transmitted still or moving pictures using a cathode ray tube. |
FR767294A (en) * | 1933-01-28 | 1934-07-13 | Rca Corp | Improvements to television systems |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE968685C (en) * | 1934-07-31 | 1958-03-20 | Fernseh Gmbh | Method for synchronizing picture and television broadcasts |
Also Published As
Publication number | Publication date |
---|---|
BE403568A (en) | |
GB422658A (en) | 1935-01-16 |
FR767294A (en) | 1934-07-13 |
DE652313C (en) | 1937-10-28 |
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