US2153655A - Cathode ray tube control circuits - Google Patents

Cathode ray tube control circuits Download PDF

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Publication number
US2153655A
US2153655A US90706A US9070636A US2153655A US 2153655 A US2153655 A US 2153655A US 90706 A US90706 A US 90706A US 9070636 A US9070636 A US 9070636A US 2153655 A US2153655 A US 2153655A
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US
United States
Prior art keywords
cathode ray
voltage
ray tube
tube
control circuits
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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 - Lifetime
Application number
US90706A
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English (en)
Inventor
Urtel Rudolf
Andrieu Robert
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Telefunken AG
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Telefunken AG
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Publication date
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Publication of US2153655A publication Critical patent/US2153655A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/24—Blanking circuits

Definitions

  • Figure 1 shows a schematic embodiment of our invention.
  • Figure 2 shows a modified arrangement according to Figure 1
  • FIG. ⁇ 3 shows still another embodiment of our invention.
  • I0 represents a coil connected in the deflection energy circuit of the cathode ray tube, and may be the magnetic deflection coil of the tube itself. Inductively coupled thereto is a coil I I across which is connected a loading resistor I2. Joined in series with this parallel arrangement is a rectifier I3, a resistance I5 and a biasing voltage I4. The direction of the induced Voltage in the -coil II when the beam is being returned to its initial position is indicated by the positive and negative signs thereon.
  • the circuit arrangement shown in Fig. 1 functions in such a fashion that during the energizing of the deiiecting members of the tube I6 in such manner as to return the beam to its initial position, there appears in the coil II a voltage, the 5 direction of said voltage being indicated by the positive and negative signs on the diagram.
  • the direction of this voltage is such as to oppose that of the biasing battery I4 and hence, if it is greater than the Value of the voltage I 4, it will cause a l0 current to flow through the series circuit comprising the coil II, rectifier I3 and resistor I5.
  • the resistor I5 being connected in series with the cathode I'I of the tube I6, the secondary of transformer I9 and a control electrode 20 of the tube, 16 the control electrode 20 will be biased with respect to the cathode of the tube by an amount equal to the voltage drop across resistor I5, and hence if the value of this voltage be suiiicient, the cathode ray beam would be blocked.
  • the arrangement shown in Fig. 2 substitutes an auto-transformer arrangement for the two 40 coils I0 and Il of Fig. 1.
  • the potentials opposite to that in the arrangement shown in Fig. 1 and therefore the rectifier connections and biasing member are changed accordingly, that is to say reversed.
  • the voltage drop through 45 resistor I5 is opposite to that in Fig. 2 and therefore the control electrode and the cathode are suitably connected thereto or, in other words, the connections to the resistor I5 are, in Fig. 2, reversed in position from those shown in Fig. 1. 50
  • the operation of the circuit is the same.
  • the resistor I5 has been supplanted in position by the rectier I3 and it is the potential across the rectifier and not across the resistor which serves the control elements of 55 the tube.
  • the direction of the potential source I4 and the rectier in Fig. 3 correspond to those in Fig. 1.
  • the circuit may be modified in the manner suggested in Fig. 2.
  • An apparatus for controlling the production of a cathode ray beam a cathode ray tube having an electromagnetic beam deection coil for deflecting the cathode ray beam comprising a deflection voltage circuit, a deection coil energized from said circuit, electrical means coupled to the coil connected to the deection Voltage circuit so that the coupled coil forms a transformer secondary and derives energy from the deflecting coil, a first series electrical circuit comprising said coupled electrical means, a rectifier and a resistor, a second series circuit comprising a control electrode of the cathode ray tube, the aforementioned resistor, the cathode of the cathode ray tube and 10 a source of modulating potential.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US90706A 1935-07-08 1936-07-15 Cathode ray tube control circuits Expired - Lifetime US2153655A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2153655X 1935-07-08

Publications (1)

Publication Number Publication Date
US2153655A true US2153655A (en) 1939-04-11

Family

ID=7987564

Family Applications (1)

Application Number Title Priority Date Filing Date
US90706A Expired - Lifetime US2153655A (en) 1935-07-08 1936-07-15 Cathode ray tube control circuits

Country Status (2)

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US (1) US2153655A (fr)
FR (1) FR807814A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426419A (en) * 1942-12-23 1947-08-26 Du Mont Allen B Lab Inc Return trace blanking and mixing
US2445017A (en) * 1945-09-14 1948-07-13 Amalgamated Wireless Australas Deflecting circuit for cathoderay tubes
US2488386A (en) * 1947-03-24 1949-11-15 Rca Corp Deflection circuit
US2524530A (en) * 1946-12-14 1950-10-03 Pye Ltd Scanning circuits particularly for television apparatus
US2548907A (en) * 1944-04-19 1951-04-17 La Verne R Philpott Sweep system
US2560815A (en) * 1949-06-30 1951-07-17 Bell Telephone Labor Inc Television receiver blanking circuit
US2569240A (en) * 1950-07-20 1951-09-25 Gen Precision Lab Inc Line brightness equalization circuit
US2646527A (en) * 1949-09-23 1953-07-21 Robert H Mathes Symmetrical sweep centering control
US2648027A (en) * 1951-09-04 1953-08-04 Du Mont Allen B Lab Inc Beam-intensity controlling circuit for cathode-ray oscillograph
US2683239A (en) * 1949-05-28 1954-07-06 Lu Garda Rieber Multiple track recorder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2607847A (en) * 1949-11-08 1952-08-19 Motorola Inc Vertical retrace blanking

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426419A (en) * 1942-12-23 1947-08-26 Du Mont Allen B Lab Inc Return trace blanking and mixing
US2548907A (en) * 1944-04-19 1951-04-17 La Verne R Philpott Sweep system
US2445017A (en) * 1945-09-14 1948-07-13 Amalgamated Wireless Australas Deflecting circuit for cathoderay tubes
US2524530A (en) * 1946-12-14 1950-10-03 Pye Ltd Scanning circuits particularly for television apparatus
US2488386A (en) * 1947-03-24 1949-11-15 Rca Corp Deflection circuit
US2683239A (en) * 1949-05-28 1954-07-06 Lu Garda Rieber Multiple track recorder
US2560815A (en) * 1949-06-30 1951-07-17 Bell Telephone Labor Inc Television receiver blanking circuit
US2646527A (en) * 1949-09-23 1953-07-21 Robert H Mathes Symmetrical sweep centering control
US2569240A (en) * 1950-07-20 1951-09-25 Gen Precision Lab Inc Line brightness equalization circuit
US2648027A (en) * 1951-09-04 1953-08-04 Du Mont Allen B Lab Inc Beam-intensity controlling circuit for cathode-ray oscillograph

Also Published As

Publication number Publication date
FR807814A (fr) 1937-01-22

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