US2185132A - Cathode ray tube - Google Patents

Cathode ray tube Download PDF

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Publication number
US2185132A
US2185132A US119192A US11919237A US2185132A US 2185132 A US2185132 A US 2185132A US 119192 A US119192 A US 119192A US 11919237 A US11919237 A US 11919237A US 2185132 A US2185132 A US 2185132A
Authority
US
United States
Prior art keywords
cathode ray
screen
ray tube
plates
deflecting
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
US119192A
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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
Application filed by LOEWE RADIO Inc filed Critical LOEWE RADIO Inc
Application granted granted Critical
Publication of US2185132A publication Critical patent/US2185132A/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
    • H01J29/02—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
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/26—Image pick-up tubes having an input of visible light and electric output
    • H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
    • H01J31/30—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at anode potential, e.g. iconoscope

Definitions

  • the invention relates to an iconoscope in which deflecting plates are provided for applying scam ning deflections to a cathode beam.
  • Fig. l of which shows diagrammatically, partly in sect onal elevation and partly in perspective, an iconoscope embodying the invention and certain electric devices associated therewith, whereas Fig. 2 shows diagrammatically in sectional elecation the electrode system of an iconoscope, in-
  • I is a hot cathode situated within a control cylinder 3 which, with the a conical member 2, preliminarily assistance of concentrates the ray on to the aperture of a diaphragm 4.
  • the latter terminates a tubular member 5, the upper portion of which, via, the apertured lid o and the edges 1 form in conjunction with an anode 8 a well corrected electrical lens.
  • aperture in the diaphragm 4 is shar optically reproduced on the photo-e1 ply electronectric mosaic 9, which is disposed on a sheet of mica I backed by a signal plate ll, in the manner well known in the art.
  • the signal plate I I is connected with the amplifier I2 through the line V.
  • the photo-electric mosaic has an optical image of the object to be televised projected thereonto. In order that this may be done from the side of the tube, he in the drawing, from the side above the plane of the paper, a mirror .21
  • the mutually insulated individual particles thereof emit photo-electrons determined in their number by the local illumination intensity, so that the optical image formed on the mosaic 9 produces an electrical charge image thereon.
  • the electron-image of the aperture in t is caused, by a system of two pairs plates Iii/I4, and Iii/I6, to scan the mosaic 9.
  • I4 are those those those for the f performing s by electro- January 11,
  • each pair of plates is shown as being connected with a reverse phase voltage generator, I'I being the generator of rapid relaxation oscillations, I8 that of slow relaxation oscillations, the reverse phase operation being in- 10 dicated by showing the middles of the generator symbols at a fixed potential, viz., that of ground, to which there is also connected the main anode 8.
  • a screening electrode 2f extending in the direction of the ray.
  • This electrode may be a cylinder.
  • it is of frusto-conical form, its rear and front orifices being selected in accordance with the cross-sections of the movement of the cathode ray, i. e., with the cross-sections of the pyramid of deflection, so that the cylinder 20 will never be touched by the ray.
  • between the frusto-conical screening member and the front edge of the plates is according to a further feature of the invention, made at least as large as the distance between the plates, so that no distortion of the field and ensuing distortion of the line screen will be caused by the electrostatic field between the frusto-conical member and the plates.
  • the distance 22 between the frusto-conical member and the photo-mosaic 9 is selected to be approximately equal to the height of the screen plate 9.
  • the front orifice of the frusto-conical member is made somewhat smaller than the photo-plate, which follows as a matter of course if it is assumed that the ray, in its extreme position just avoids touching the frusto-conical member.
  • the suction field between the frusto-conical screening member 20 and the photo-plate 9 is of equal strength in respect of practically all points of this plate.
  • the potentiol is supplied by a lead 23, which may also be passed through the base of the tube, but must be by-passed to earth by a steadying condenser 24 of approximately 1 mf., and protected against penetrating oscillations by a series resistance 25. It is preferable to conduct this lead, too, out of the tube separately from the remaining leads serving for deflection and focussing purposes, in order that the screening member be maintained free from capacitative coupling by oscillations within the tube.
  • the voltage of the biasing battery 23 may be in the order of +100 volts, and is preferably between (i and +50 volts.
  • the tested iconoscope described operates with a considerable sharpness of the scanning lines, viz. with lines of about 2 mm.
  • the aperture in the diaphragm of which the scanning spot is an electron image is 3 mm .in diameter.
  • the screen has a diameter of approximately 60 mm. so that the screen has room for about 300 lines disposed closely adjacent to each other.
  • An increased fineness of the screen may be obtained simply by reducing the diameter of the aperture in the diaphragm 4 from .3 to .2 mm.
  • the optimum operation was found with about 800 volts anode potential.
  • Mirror 2'! is preferably in metallic connection with the plate It, and the light from the object to be televised is preferably projected through'the screening member 20.
  • Fig. 2 which illustrates a tested modified form of an iconoscope embodying the invention
  • the electrode 20 is shown cylinder shaped.
  • the diameter of the cylinder in the case of a given length, which should be as great as possible'is fixed quite definitely by the shown extremum positions of the deflected cathode ray.
  • the length of the cylinder amounted to 50 mm. with 35 mm. diameter, the size of the mosaic screen being 50 x 50 mm., and the length of the oscillating part of the ray amounting to 100 mm.
  • the deflecting mirror 27 was disposed, as far as possible, towards the rear of the cylinder, where it did not intersect the passage of the rays.
  • the screening electrode 26 may, according to a further feature of the invention, be completed by a wire net as shown by 30, arranged in accordance with the copending patent application numbered 119,194, filed January 6, 1937.
  • a cathode ray tube comprising a photoelectrically sensitive electrode structure, means for producing a cathode beam directed onto said structure, electrostatic cathode ray deflecting means for causing the part of said beam disposed between a point of its path and said structure to oscillate laterally about the stated point so that said beam sweeps over said structure, and an extended conductor mounted between said deflecting means and said structure and surrounding at least hah of the mentioned part of the path of said beam to screen said structure fromv said and said structure, said conductor being extended in the direction from said further electrodes to said structure to screen said structure from said further electrodes, a lead connected to each of said electrodes, all of said leads being taken through said base portion, further leads connected to said counterplate and to said photoanode, said further leads being separately fused through said envelope.
  • a cathode ray tube comprising a photoelectrically sensitive electrode structure, means for producing a cathode beam directed onto said structure, electrostatic cathode ray deflecting means for causing the part of said beam disposed between a point of its path and said structure to oscillate laterally about the stated point so that said beam sweeps over said structure, and an extended hollowcylinder-shaped conductor mounted between said deflecting means and said structure and surrounding at least half of the mentioned part of the path of said beam to screen said structure from said deflecting means.
  • a cathode ray tube comprising a photoelectrically sensitive electrode structure, means for producing a cathode beam directed onto said structure, means for causing the part of said beam disposed between a point of its path and said structure to oscillate laterally about the stated point so that said beam sweeps over said structure, and an extended conductor of hollow-frustoconical shape mounted between said deflecting means and said structure and surrounding at least half of the mentioned part of the path of said beam to screen said structure from said deflecting means.
  • a cathode ray tube having an insulating wall and comprising a photo-electrically sensielectrostatic cathode ray deflecting tive electrode structure, means for producing a laterally about the stated point so that said beam sweeps over said structure, the combination comprising an extended conductor mounted between said deflecting means and said structure and surrounding at least half of the mentioned part of the path of said beam toscreen said structure from said deflecting means, and a metallic coating on the inside of said insulating wall.
  • a cathode ray tube having an insulating wall and comprising a photo-electrically sensitive electrode structure, means for producing a cathode beam directed onto said structure, and electrostatic cathode ray deflecting means for causing the part of said beam disposed between a point of its path and said structure to oscillate laterally about the stated point sothat said beam sweeps over said structure, the combination comprising an extended conductor mounted between said deflecting means and said structure and surrounding at least half of the mentioned part of the path of said beam to screen said structure from said deflecting means, a metallic coating on the inside of said insulating wall, and a lead connected to said coating and taken through said wall to the outside of said cathode ray tube.
  • a cathode ray tube comprising a photoelectrically sensitive electrode structure, means for producing a cathodebeam directed onto said 5 structure, electrostatic cathode ray deflecting means for causing the, part of said beam disposed between a point of its path and said structure to oscillate laterally about the stated point so that said beam sweeps over said structure, an extended conductor mounted between said deflecting means and said structure and surrounding at least half of the mentioned part of the path of said beam to screen said structure from said deflecting means, and a Wire net at said conductor for improving its screening effect.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US119192A 1936-01-11 1937-01-06 Cathode ray tube Expired - Lifetime US2185132A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE486214X 1936-01-11

Publications (1)

Publication Number Publication Date
US2185132A true US2185132A (en) 1939-12-26

Family

ID=6543406

Family Applications (1)

Application Number Title Priority Date Filing Date
US119192A Expired - Lifetime US2185132A (en) 1936-01-11 1937-01-06 Cathode ray tube

Country Status (3)

Country Link
US (1) US2185132A (fr)
FR (1) FR816190A (fr)
GB (1) GB486214A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2781474A (en) * 1951-07-16 1957-02-12 Radiation Res Corp Beam deflection electrometer amplifier tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2781474A (en) * 1951-07-16 1957-02-12 Radiation Res Corp Beam deflection electrometer amplifier tubes

Also Published As

Publication number Publication date
GB486214A (en) 1938-06-01
FR816190A (fr) 1937-08-02

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