US2168892A - Cathode ray device - Google Patents

Cathode ray device Download PDF

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Publication number
US2168892A
US2168892A US722863A US72286334A US2168892A US 2168892 A US2168892 A US 2168892A US 722863 A US722863 A US 722863A US 72286334 A US72286334 A US 72286334A US 2168892 A US2168892 A US 2168892A
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US
United States
Prior art keywords
tube
plates
ray
screen
unit
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
US722863A
Other languages
English (en)
Inventor
Vladimir K Zworykin
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.)
RCA Corp
Original Assignee
RCA Corp
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 BE410128D priority Critical patent/BE410128A/xx
Priority to BE409165D priority patent/BE409165A/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US722863A priority patent/US2168892A/en
Priority to US732566A priority patent/US2146017A/en
Priority to DER93202D priority patent/DE679329C/de
Priority to GB12806/35A priority patent/GB455927A/en
Application granted granted Critical
Publication of US2168892A publication Critical patent/US2168892A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements
    • 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

Definitions

  • My invention relates to improvements in cathode ray devices and themethod of construction thereof.
  • cathode ray tubes In the operation of cathode ray tubes, particularly those for use in a television system, it is' desirable to deilect the ray in one direction by electromagnetic coils, and in the other direction, at right angles to the rst direction, by an electrostatic eld between a pair of plates.
  • the reason for this is due to the fact that when the ray is deflected in both directions by electromagnetic coils, the two magnetic fields interact or interfere with each other to cause distortion at the edges of the scanning pattern, and defocusing 15.- of the ray on the scanned surface of the screen.
  • the plates for this purpose have either been sealed in place through the sides of the tube, or have been asytraind with the electron gun.
  • the rst method requires very careful workmanship in the glass 30 blowing operation which increases the cost of production and, in the construction of the socalled projection tubes, cannot be followed in any event because there is no available space in which to work.
  • the second method of mounting the I6 plates is undesirable because, in operation, the leads from the plates may be at a potential of as much as 10,000 volts or more with respect to the cathode. 'I'his introduces considerable difficulties in the construction of a I0 a high potential difference.
  • a tube blank ll is used in which both the large and the small ends are open.
  • the electron gun is assembled as a unit, and is inserted into the small end of the tube and then sealed in place.
  • the deecting plates are assembled as a unit which is in- 5 serted into the large bulbous end of the tube and press to withstand such 1934, Serial N0. 722,863 (Cl. Z50-27.5)
  • an insulating collar provides a supporting connection between the two units.
  • Connecting leads extending through the wall of the tube at the large end thereof are then secured to the respective plates, and these rigidly support and hold them in position.
  • the end wall piece, in the form of a glass plate provided screen, is then applied to the tube and sealed in place.
  • Figure 1 is a static ray-deflecting unit
  • Fig.- 2 is a perspective View of the electron gun
  • Fig. 3 is a central, longitudinal, sectional view, illustrative of the manner in which the various parts and units are assembled to make the complete tube.
  • 'I'he deflecting plates I0 and I2 are secured by wire sections I3 and I4, joined by glass beads I5, to a collar I6 of insulating material which is bored to receive the wire sections I3, as shown in Fig. 3.
  • a diaphragm I8, provided with a central aperture 20, is disposed over one end of the collar I6, as more clearly .shown in Fig. 3, and is provided with openings 2
  • 'g Leads 22 and 24 are connected, respectively, to the plates II) and I2, and the latter are supported in fixed relation to each other lat their outer ends by struts 26 comprising sections of wire and an interposed glass bead, as shown.
  • the electron gun or means for developing the ray of electrons is assembled as a unit on a press 28, in the sam ⁇ e manner as in the copending application by John C. Batchelor, Serial No. 584,924, filed January 6, 1932.4
  • the gun comprises a cathode 30 and its associated heater 32, a tubular grid 34 to which the picture signals are applied for controlling the intensity of the ray, and a tubular anode 36 to which a relatively high potential is applied for accelerating the electrons to a high velocity after they have' passed beyond the influence of the controlgrid 34.
  • An insulating collar 38 receives the adjacent ends of the tubes 34 and 36, and operates to space and maintain alignment of these parts.
  • Wire sections 40 and an interposed glass bead 42 hold large end of the with a fluorescent.
  • connection to the anode tube 36 is made by a lead M which extends through the press.
  • the connections to the grid 34, the cathode 30 and the heater 32 are also made through the press, as shown.
  • the electron gun unit is inserted into the small end of the tube blank 46, both ends of which are open.
  • the adjacent edges of the press 28 and the tube blank are then sealed at 4B, with the axis of the gun unit coincident with that of the tube.
  • the ray-defiecting unit i's then inserted into the large bulbous portion of the tube, with the end of the anode 38 extending into the collar I6 with a snug fit, whereby the deflecting unit is supported by and maintained in alignment with the electron gun unit.
  • Lead wires 22a and 24a which are sealed through the Wall of the tube, are then connected respectively to the lead wires 22 and 24. These wires support the deflecting unit rigidly at the outer end thereof.
  • a lead wire 50 extending through the wall of the tube, is connected to a lead wire 52 previously secured to the diaphragm I8.
  • An end wall piece 54 in the form of a glass disc provided with a fluorescent screen 56, is then applied and sealed to the large open end of the tube, after which the latter is evacuated and treated in the usual manner.
  • the fluorescent screen 58 can be applied to the end Wall 54 through a suitable opening in the tube blank; after the latter has been sealed in place.
  • Electrodes of secondary emission leave the screen 56 as the latter is scanned by the cathode ray. These electrons are collected by the deflecting plates and are removed by way of the leads 22a and 24a. It is also proposed to collect and remove at least some of the secondary electrons by an auxiliary electrode 58 in the form of an open ring supported from the deecting plates by wire sections 60 and the interposed ,glass beads 62 which insulate this electrode from the plates. A suitable operating potential is applied to the electrode 58 by a lead 64 sealed through the tube wall. When used, the electrode unit before the latter is placed into the tube.
  • a tube blank having at one end thereof a bulbous portion in which the deflecting plates are disposed, and which is provided with a tubular portion in which the electron gun unit is disposed.
  • the deflecting plates are placed in position through the large open end of the tube blank, which facilitates centering and adjustment of the structure after the electron gun unit has been sealed in.
  • the fluorescent screen is sealed in place after the ray-deflecting unit and the electron gun unit have been properly placed within the tube, without affecting the alignment of these units.
  • the diaphragm I8 to which is applied a potential positive with respect to the anode 36. operates to focus the ray on the screen 56.
  • the distance between the screen andthe gun can be made substantially smaller lthan this distance in constructions proposed heretofore. It is thereby possible to obtain a. sharper focus of the ray on the screen 58.
  • the sensitivity of deflection is substantially greater than in the various constructions proposed heretofore due to the feasibility of bringing the defiecting plates closer together and extending them for a substantial distance along the tube between the end of the electron gun and the screen.
  • the raydeilecting plates are assembled through the large open end of the tube blank, they can be made substantially larger than has been possible heretofore.
  • the plates are, therefore, effective for collection of the electrons of secondary emission from the screen, which removes the necessity of silvering the interior surface of the tube. This allows the heat and light from the fluorescent screen to radiate through the clear glass, thereby preventing undesirable heating of the screen. For this reason, burning of the fluorescent material is less likely, and the tube can be operated at higher power than those proposed heretofore.
  • a cathode ray device comprising a tube having at one end thereof a bulbous portion provided with a screen, a tubu lar portion in which is disposed a unit for developing a ray of electrons and directing the ray at said screen, and a pair of plates; said method comprising placing said plates into said tube by way of the screen end thereof which is open for this purpose, locating the plates both within the tubular and bulbous portion of the tube, supporting the plates both from the tube and the ray developing and directing unit, and subsequently afiixing an end wall piece to the screen end of said tube to close the same.
  • a cathode ray device comprising a tube having at one end thereof a bulbous portion provided with a screen, a tubular portion in which is disposed a unit for developing a ray of electrons and directing the ray at said screen, and a pair of plates disposed at least partly in said bulbous portion for dellecting the ray; said method comprising assembling said plates with respect to each other to form a.
  • a cathode ray device comprising a tube proscreen, means disposed within said tube for developing a ray of electrons and directing the same at said screen, a pair of plates distube between said screen and said ray-developing means for rdeilecting the ray, a collar oi' insulating material engaging the electron-emitting erid o1' said ray-developing means 'ends of said plates with the aperture in line with of the tube blank.
  • a cathode ray device comprising a tube having a bulbous portion at one end and a stem and press member-at the opposite end, a cathode support from said press member, a hollow cylindrical electrode positioned coaxially with and surrounding said cathode and also supported from said press member, an apertured insulator mounted upon the cylindrical electrode at theend thereof remote from the cathode, a second hollow cylindrical electrode held in predetermined space relationship by the apertured' insulator and supported from both the press member and the rst cylindrical electrode, and a second apertured insulator the second cylindricalelectrode.
  • a cathode ray device comprising a cylindrical tube flaring out to form a bulbous portion at one end and a press at the other end, an electronI gun mounted upon and supported' by the press within the cylindrical tube, a pair of deiiecting plates, means to support the plates from both the electron ⁇ gun and the bulbous portion of the tube, independent means for maintaining the plates in spaced relation with each other, an annular disk electrode, means to support the disk in register and coaxial with the electron gun from the deecting plates, and a uorescent screen supported from the bulbous portion of the tube, said annular electrode being supported intermediate the deilecting plates and the fluorescent screen.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Cold Cathode And The Manufacture (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
US722863A 1934-04-28 1934-04-28 Cathode ray device Expired - Lifetime US2168892A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE410128D BE410128A (fr) 1934-04-28
BE409165D BE409165A (fr) 1934-04-28
US722863A US2168892A (en) 1934-04-28 1934-04-28 Cathode ray device
US732566A US2146017A (en) 1934-04-28 1934-06-27 Cathode ray apparatus
DER93202D DE679329C (de) 1934-04-28 1935-04-28 Elektrodenanordnung fuer Kathodenstrahlroehren
GB12806/35A GB455927A (en) 1934-04-28 1935-04-29 Improvements in or relating to cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US722863A US2168892A (en) 1934-04-28 1934-04-28 Cathode ray device

Publications (1)

Publication Number Publication Date
US2168892A true US2168892A (en) 1939-08-08

Family

ID=24903721

Family Applications (1)

Application Number Title Priority Date Filing Date
US722863A Expired - Lifetime US2168892A (en) 1934-04-28 1934-04-28 Cathode ray device

Country Status (4)

Country Link
US (1) US2168892A (fr)
BE (2) BE410128A (fr)
DE (1) DE679329C (fr)
GB (1) GB455927A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728009A (en) * 1950-11-14 1955-12-20 Rca Corp Cathode-ray tube with target support
US3499197A (en) * 1965-12-16 1970-03-10 Fernseh Gmbh Image orthicon tubes
US3571645A (en) * 1968-04-14 1971-03-23 Sony Corp Color picture tube with mounting means for electrostatic beam convergence plates
US3575625A (en) * 1968-04-13 1971-04-20 Sony Corp Color tube with convergence electrode mounting and connecting structure
US20050106200A1 (en) * 2003-11-14 2005-05-19 Italo Corzani Polymeric compositions for sustained release of volatile materials
US20060099168A1 (en) * 2004-11-05 2006-05-11 Italo Corzani Polymeric compositions for sustained release of volatile materials
US20070129476A1 (en) * 2005-12-07 2007-06-07 The Procter & Gamble Company Polymeric compositions for sustained release of volatile materials

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB740614A (en) * 1951-10-17 1955-11-16 Emi Ltd Improvements relating to electrode assemblies for electron discharge devices

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728009A (en) * 1950-11-14 1955-12-20 Rca Corp Cathode-ray tube with target support
US3499197A (en) * 1965-12-16 1970-03-10 Fernseh Gmbh Image orthicon tubes
US3575625A (en) * 1968-04-13 1971-04-20 Sony Corp Color tube with convergence electrode mounting and connecting structure
US3571645A (en) * 1968-04-14 1971-03-23 Sony Corp Color picture tube with mounting means for electrostatic beam convergence plates
US20050106200A1 (en) * 2003-11-14 2005-05-19 Italo Corzani Polymeric compositions for sustained release of volatile materials
US7833515B2 (en) 2003-11-14 2010-11-16 Procter & Gamble Company Polymeric compositions for sustained release of volatile materials
US20060099168A1 (en) * 2004-11-05 2006-05-11 Italo Corzani Polymeric compositions for sustained release of volatile materials
US20070129476A1 (en) * 2005-12-07 2007-06-07 The Procter & Gamble Company Polymeric compositions for sustained release of volatile materials
US8043606B2 (en) 2005-12-07 2011-10-25 The Procter & Gamble Company Polymeric compositions for sustained release of volatile materials
US8916140B2 (en) 2005-12-07 2014-12-23 The Procter & Gamble Company Polymeric compositions for sustained release of volatile materials

Also Published As

Publication number Publication date
BE409165A (fr)
DE679329C (de) 1939-08-03
BE410128A (fr)
GB455927A (en) 1936-10-29

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