US3352970A - Cathode ray tubes and apparatus using the same - Google Patents

Cathode ray tubes and apparatus using the same Download PDF

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Publication number
US3352970A
US3352970A US355301A US35530164A US3352970A US 3352970 A US3352970 A US 3352970A US 355301 A US355301 A US 355301A US 35530164 A US35530164 A US 35530164A US 3352970 A US3352970 A US 3352970A
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US
United States
Prior art keywords
fluorescent screen
electron beam
cathode ray
bulb
ray tube
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
US355301A
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English (en)
Inventor
Koyanagi Yukio
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of US3352970A publication Critical patent/US3352970A/en
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    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • 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
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/124—Flat display tubes using electron beam scanning
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/893—Optical components associated with the vessel using lenses

Definitions

  • the centrz 1 shows a pie a cathode ray tube bui beam when the met is not ing the prese entio by side eie ation A an the d fl t d demo beam 6W1 3', eiectric ireid, as diagramm: G a iront eie atron Xampi oi iiuores P16.
  • the shape of the cathode ray tube as seen from the Z- direction depends upon the shape of the fluorescent screen to a certain extent.
  • the shape of the fluorescent screen is not necessarily approximately rectangular by the reason hereinafter described, but may be nearly a trapezoid, if necessary.
  • the line of its intersection with the plane of the glass window decides the shape of the cathode ray tube as seen from the Z-direction.
  • the plane of the window is desirable to be geometrical plane as far as is-allowed by the strength of the glass bulb subjected to the atmospheric pressure, from the standpoint of image distortion, and it is nearly a plane substantially lying in X-Y plane.
  • the line of intersection hereinabove referred to becomes line 14 in FIG. 14; Consequently, the shape of the cathode ray tube as seen from the Z-direction is as shown in FIG. 13B.
  • the glass bulb When the fluorescent screen is trapezoidal with a similar cross-sectional shape of the glass bulb, the glass bulb may have sharp corners providing weak points, as well as, inner places of inconvenient working, such as metal-backing. For this reason, it is desirable to make the fluorescent screen with a rectangular shape.
  • R1 is for providing tolerance in order not to have the inclination of the deflecting system observed clearly by scanning lines
  • R2 is decided to prevent the ends of the fluorescent screen from being apparently concaved, when the fluorescent screen of partcylindrical shape is seen from the X-, and Z-directions.
  • R is provided for giving tolerance for neck-shadow.
  • an extra electrode may, for example, be disposed within the cathode ray tube for limiting the electron beam after having been deflected to a definite shape.
  • the upper and lower lateral lengths a and b (see FIGS. 14 and 15) of the fluorescent screen are decided by the extent of electrical compensation by means of the waveshapes of deflecting current or the like, or of magnetic compensation by means of compensating magnets, except optical means for compensation of the shape of the fluorescent screen.
  • the fluorescent screen is viewed through transparent glass window portion 13 in FIG. 13. This portion must not have any optical distortion, but its color or transparency may be changed if necessary or desirable.
  • the fluorescent screen is formed on the above-mentioned electro-conductive film and transparent inner film.
  • the metal back is not so effective when used at about 5 kv. anode voltage, and consequently, the metal back may be omitted in order to simplify manufacturing steps.
  • the metal back is effective and may advantageously be employed.
  • the fluorescent screen may be formed directly on the bulb glass.
  • magnification m1 at the upper edge A and m2 at the lower edge B by the optical magnifying system are:
  • Equation 17 F cos 0 (17) is obtained.
  • the arrangement will be free from key stone distortion when the relationship defined .by Equation 17 is established therein.
  • Various kinds of optical magnification may be used, among which concave mirrors and convex lenses are utilized, in general.
  • the cathode ray tube may be of simple construction with a relatively small horizontal depth, suitable for use in a portable television receiver, and the like.
  • its power consumption is low, while its image resolution is good.
  • an optical magnifying system as a Fresnel lens, with the axis of the optical system inclined to the vertical axis of the fluorescent screen, electrical compensation of the deflection can easily be effected, and also easy-viewing of a fluorescent image is obtained.
  • a cathode ray tube comprising a closed glass bulb, an electron gun at one end of said bulb directing an electron beam along a central axial line of said bulb to a portion of the inner surface at opposite end of said bulb, an electroconductive film layer on said inner surface of said bulb at a position out of alignment with but adjacent to the central axial line of said electron beam at said opposite end of said bulb, a fluorescent screen provided on said film layer, said fluorescent screen being inclined to said axial line at an acute angle with the side edge of said fluorescent screen which is the most remote from said electron gun being positioned closely adjacent said central axial line of said electron beam, the shape of a vertical section of said screen in a plane containing said central axial line of the electron beam being a circular arc the center of which is at the point of intersection of a circle passing through the opposite ends of said section and the apparent center of electron beam deflection, and the perpendicular bisecting line to a line connecting said opposite ends of the fluorescent screen passing through said center, and the radius of said circular are being equal to the
  • a cathode ray tube apparatus comprising a cathode ray tube, said tube comprising a closed bulb having an electron gun therein, said gun projecting an electron beam at a portion of the inner surface of said bulb spaced therefrom along a central axial line of said electron beam, an electroconductive film layer on said inner bulb surface adjacent the point where said electron beam impinges on said inner surface, and a fluorescent screen provided on said film layer, said fluorescent screen being inclined to the axial line of said electron beam at an acute angle with the side of said fluorescent screen remote from said electron gun being positioned near said central axial line of 8 said electron beam, an optical system disposed inclined to said fluorescent screen for compensating for the trapezoidal distortion of raster, said optical system being formed by an optical lens satisfying an equation References Cited UNITED STATES PATENTS 2,260,228 10/1941 Moller 8857 2,538,852 7/1951 Szegho 1787.85 2,842,711 7/1958 Frenkel 315 2,967,262 1/1961 Made

Landscapes

  • Transforming Electric Information Into Light Information (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US355301A 1963-04-12 1964-03-27 Cathode ray tubes and apparatus using the same Expired - Lifetime US3352970A (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP1930463 1963-04-12
JP1954363 1963-04-15
JP3359963 1963-06-24
JP3360063 1963-06-24
JP4983263 1963-07-01
JP5048963 1963-07-05
JP5048863 1963-07-05
JP2164 1963-12-28

Publications (1)

Publication Number Publication Date
US3352970A true US3352970A (en) 1967-11-14

Family

ID=27571392

Family Applications (1)

Application Number Title Priority Date Filing Date
US355301A Expired - Lifetime US3352970A (en) 1963-04-12 1964-03-27 Cathode ray tubes and apparatus using the same

Country Status (6)

Country Link
US (1) US3352970A (nl)
BE (1) BE646400A (nl)
CH (1) CH422864A (nl)
DE (1) DE1762776B2 (nl)
GB (1) GB1049045A (nl)
NL (2) NL6403876A (nl)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2260228A (en) * 1937-04-21 1941-10-21 Firm Fernsch Ag Means for projecting images
US2538852A (en) * 1945-12-29 1951-01-23 Rauland Corp Kinescope projection by refractive optical system mounted on tube neck
US2842711A (en) * 1957-04-19 1958-07-08 Du Mont Allen B Lab Inc Television tube
US2967262A (en) * 1956-07-30 1961-01-03 Madey Richard Multi-color display tube
US3299314A (en) * 1962-12-29 1967-01-17 Tokyo Shibaura Electric Co Cathode ray tube having a screen conforming to the peripheral surface of a cylinder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2260228A (en) * 1937-04-21 1941-10-21 Firm Fernsch Ag Means for projecting images
US2538852A (en) * 1945-12-29 1951-01-23 Rauland Corp Kinescope projection by refractive optical system mounted on tube neck
US2967262A (en) * 1956-07-30 1961-01-03 Madey Richard Multi-color display tube
US2842711A (en) * 1957-04-19 1958-07-08 Du Mont Allen B Lab Inc Television tube
US3299314A (en) * 1962-12-29 1967-01-17 Tokyo Shibaura Electric Co Cathode ray tube having a screen conforming to the peripheral surface of a cylinder

Also Published As

Publication number Publication date
NL151210B (nl) 1976-10-15
CH422864A (de) 1966-10-31
DE1762776B2 (de) 1971-07-22
GB1049045A (en) 1966-11-23
NL7013407A (nl) 1971-01-25
DE1762776A1 (de) 1970-09-17
BE646400A (nl) 1964-07-31
NL6403876A (nl) 1964-10-13

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