US2197899A - Television tube - Google Patents

Television tube Download PDF

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Publication number
US2197899A
US2197899A US213731A US21373138A US2197899A US 2197899 A US2197899 A US 2197899A US 213731 A US213731 A US 213731A US 21373138 A US21373138 A US 21373138A US 2197899 A US2197899 A US 2197899A
Authority
US
United States
Prior art keywords
deflecting
bias
cathode ray
condenser
further electrode
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 - Lifetime
Application number
US213731A
Other languages
English (en)
Inventor
Schlesinger Kurt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LOEWE RADIO Inc
Original Assignee
LOEWE RADIO Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to NL51359D priority Critical patent/NL51359C/xx
Priority to BE408184D priority patent/BE408184A/xx
Priority to BE408183D priority patent/BE408183A/xx
Priority claimed from US8660A external-priority patent/US2137353A/en
Priority to US8660A priority patent/US2137353A/en
Priority to FR786632D priority patent/FR786632A/fr
Priority to GB25752/36A priority patent/GB457848A/en
Priority to GB25753/36A priority patent/GB456717A/en
Priority to GB20744/36A priority patent/GB457846A/en
Priority to GB6688/35A priority patent/GB457757A/en
Priority to GB25754/36A priority patent/GB456331A/en
Application filed by LOEWE RADIO Inc filed Critical LOEWE RADIO Inc
Priority to US213731A priority patent/US2197899A/en
Publication of US2197899A publication Critical patent/US2197899A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H04N3/02—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only
    • H04N3/04—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving aperture also apertures covered by lenses
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/62—Electrostatic lenses
    • H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
    • H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/74—Deflecting by electric fields only

Definitions

  • the present invention relates to cathode ray tubes for television and the like and more particularly to tubes in which the ray is focussed on the screen by means of an electrostatic lens and, afterwards, is deflected by means of one or tWo pairs of plates furnished with deflecting voltages.
  • the invention is illustrated in the accompanying drawing which is a diagram of the head of a cathode ray tube and the elements connected with its electrodes.
  • l is the cathode having anemissive spot of say .3 mm. diameter
  • ii is a diaphragm, having a smaller aperture 1 which is to be reproduced on the luminous screen
  • 9 is a tubular member
  • l2 the anode
  • I 3-44 the first and i5-l6 the second pair of deflecting plates.
  • the anode i2, the diaphragm i3, and also a conductive wall coating ll! of the tube (the glass Wall is not shown) are earthed whilst the cathode has a high negative potential and 9 a mean one tapped at the anode battery 48.
  • This method of operation is illustrated diagrammatically by a. tap to the middle of the secondary winding of each of two transformers 36 and 3?, the primary windings of which are fed by relaxation oscillation generators I? and i8 the two middle tappings in question being earthed dynamically via condensers 38 and 39.
  • the centres of the transformers 36 and 31 are provided With negative biasses compared with the anode. These biasses are derived for example through the medium of a potentiometer 4
  • Each deflecting condenser 13-! and l5-l5 upon application of the negative bias according to the invention acts against the surroundings (I2, I9) raised to anode potential as a concentration electrode which concentrates the ray, however, only in the direction of its electrical field, and does not afiect the same in the direction of the plane of the plates. If the bias iii according to the invention were not provided, the plates act in optical dispersing fashion on the ray, as apparently a small difierence in potential exists between their potential and the electrons of the ray.
  • An additional advantage of the measure according to the invention is the minimizing of the transverse currents of the ray flowing to the plates, and accordingly a closer approximation towards an entirely powerless deflection.
  • biasses employed in accordance with the invention depend on the arrangement of the deflecting plates in relation to the anode, the wall coating and in relation to each other, but in each individual case may be determined in simple fashion by experiment. As regards their extent, the biasses employed are of the order of about 10% of the anode potential.
  • the deflecting plates exert an optically deforming efiect on the ray, which may be fully compensated in the manner according to the invention by the use of biasses, which difier in different cases as regards their extent and possibly also their sign.
  • the arrangement for reverse phase operation of the deflecting plates has been quoted merely as an example. Naturally all otherknown, arrangement may be employed for this purpose.
  • the method according to the invention may be employed fundamentally in connection withall Braun tubes having an electron-optical system,
  • a cathode ray tube including electrodes forming a cathode ray'defiecting condenser and at least one further electrode mounted near the first said: electrodes and bein at least partly plate-shaped and disposed in a cross-section of said cathode ray tube, means for supplying said deflecting condenser with reverse phase deflecting voltages, means for applying to said further electrode a fixed potential, and means for applying to the electrodes of saiddefleeting condenser, taken as a Whole, a common variable bias relatively to said further electrode, the frequencyof said bias being equal to that of the mentioned deflecting voltages.
  • a cathode ray tube including electrodes forming a cathode ray'defiecting condenser and at least one further electrode mountednear the first said electrodes and being at least partly plate-shaped and disposed in a cross-section of said cathode ray tube, means for supplying said deflecting condenser with reverse phase deflecting voltages, means for applying to said further electrode a fixed potential, and means for applying to the electrodes of said deflecting condenser taken as a Whole, a common variable. bias relatively to said further electrode, the frequency of said bias being twice as high as that of the mentioned deflecting voltages.
  • a cathode ray tube including electrodes forming a cathode ray deflecting condenser and at least one further electrode mountednear the first said electrodes and being at least. partly plate-shaped and disposed in a cross-section of said cathode ray tube, means for supplying said deflecting condenser with reverse phasedefiecting voltages, means for applying to said 'further electrode a fixed potential. and ,meansforapplying to the electrodes of said deflectingcondenser, taken as a whole, a common constant and a common additional variable bias relatively to said further electrode.
  • a cathode ray tube including electrodes forming a cathode ray deflecting condenser and at least. one further electrode mounted near the first said electrodes and being at least partly plate-shaped and disposed in a cross-section of said cathode ray tube, means for supplying said deflecting condenser with reverse phase deflecting. voltages, means for applying to said further electrode a fixed potential, and means for applying to the electrodes of said deflecting condensentaken as a whole, a common alternating bias relatively tosaid further electrode.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Transforming Electric Information Into Light Information (AREA)
US213731A 1934-03-03 1938-06-15 Television tube Expired - Lifetime US2197899A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
NL51359D NL51359C (de) 1934-03-03
BE408184D BE408184A (de) 1934-03-03
BE408183D BE408183A (de) 1934-03-03
US8660A US2137353A (en) 1934-03-03 1935-02-28 Television tube
FR786632D FR786632A (fr) 1934-03-03 1935-03-02 Tube à rayons cathodiques pour la télévision
GB25753/36A GB456717A (en) 1934-03-03 1935-03-04 Improvements in or relating to braun tubes and circuits therefore, preferably for television purposes
GB25752/36A GB457848A (en) 1934-03-03 1935-03-04 Improvements in or relating to television cathode ray tubes
GB20744/36A GB457846A (en) 1934-03-03 1935-03-04 Improvements in or relating to television tubes
GB6688/35A GB457757A (en) 1934-03-03 1935-03-04 Television cathode ray tube
GB25754/36A GB456331A (en) 1934-03-03 1935-03-04 Improvements in or relating to braun tubes, preferably for television purposes
US213731A US2197899A (en) 1934-03-03 1938-06-15 Television tube

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2137353X 1934-03-03
DE456331X 1934-03-31
US8660A US2137353A (en) 1934-03-03 1935-02-28 Television tube
US213731A US2197899A (en) 1934-03-03 1938-06-15 Television tube

Publications (1)

Publication Number Publication Date
US2197899A true US2197899A (en) 1940-04-23

Family

ID=32074463

Family Applications (1)

Application Number Title Priority Date Filing Date
US213731A Expired - Lifetime US2197899A (en) 1934-03-03 1938-06-15 Television tube

Country Status (5)

Country Link
US (1) US2197899A (de)
BE (2) BE408183A (de)
FR (1) FR786632A (de)
GB (5) GB457846A (de)
NL (1) NL51359C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2572858A (en) * 1947-06-03 1951-10-30 Sylvania Electric Prod Electron optical system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE766496C (de) * 1936-01-29 1952-04-10 Aeg Elektronenoptischer Bildwandler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2572858A (en) * 1947-06-03 1951-10-30 Sylvania Electric Prod Electron optical system

Also Published As

Publication number Publication date
NL51359C (de)
GB456717A (en) 1936-11-04
FR786632A (fr) 1935-09-06
GB456331A (en) 1936-11-04
BE408184A (de)
GB457757A (en) 1936-12-04
GB457848A (en) 1936-12-04
GB457846A (en) 1936-12-04
BE408183A (de)

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