US2069460A - Cathode ray tube - Google Patents

Cathode ray tube Download PDF

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Publication number
US2069460A
US2069460A US691671A US69167133A US2069460A US 2069460 A US2069460 A US 2069460A US 691671 A US691671 A US 691671A US 69167133 A US69167133 A US 69167133A US 2069460 A US2069460 A US 2069460A
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US
United States
Prior art keywords
ray
screen
plates
axis
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
US691671A
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English (en)
Inventor
Gregory N Ogloblinsky
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
Individual
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 NL40870D priority Critical patent/NL40870C/xx
Application filed by Individual filed Critical Individual
Priority to US691671A priority patent/US2069460A/en
Priority to FR45199D priority patent/FR45199E/fr
Application granted granted Critical
Publication of US2069460A publication Critical patent/US2069460A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/46—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
    • 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

Definitions

  • This invention relates to improvements in television systems.
  • the cathode ray at the transmitting station is deflected in such manner as to tend to spread out the scanned pattern in a keystone effect opposite to the keystone pattern which would ⁇ otherwise be scanned, the effect being to substantially entirely compensate vor correct for the latter, so that the scanned pattern is rectangular in shape.
  • ⁇ More particularly, in accordance with the invention, complementary plates are used to defiect the cathode ray at the higher frequency, sometimes referred to as the line frequency.
  • the edgesof these plates nearer to the screen are cut on 'a bias in such manner and amount to cause the amplitude of deflection to vary uniformly during each scanning period. In this way,
  • each line is made slightly shorter by the same amountv from each end thereof than the preceding line, to cause the ray to scan a keystone area in a. plane perpendicular to the tube axis, the sides of this area being inclined upwardly toward each other.
  • the ray strikes the inclined screen, therefore, and is deflected in the two directions at right angles to each other, it
  • the invention resides in the improved apparatus of the character hereinafter described and claimed.
  • Figure 1 is a perspective view, partly diagrammatic, of a transmitting tube constructed and operating in accordance with the invention
  • Fig. 2 is a simplified, front elevational view, taken from Fig. l;
  • Fig. 3 is a plan view of Fig. 2;
  • Fig. 4 is a sectional view, the section being taken on the line 4--4 in Fig. 2;
  • Fig. 5 is a diagrammatic view illustrative of the principle of operation.
  • a transmitting tube III is provided with an electrode I2 having a photosensitive surface I4 comprised of a great number of minute metallic elements, such as silver globules, each insulated from the electrode I2 and from each other, and each provided with a coating of photosensitive material.
  • an image of the object shown as being in the form of a moving picture film I6, is projected upon the photosensitive surface by a suitable optical system I'I, the axis I8 of the optical system being perpendicular to the screen surface I4.
  • a gun 20 of any suitable construction operates to develop and direct a ray 24 of electrons at the photosensitive surface I4, the axis 22 of the gun being disposed at an angle, for example 60 degrees, to the photosensitive surface I4.
  • a saw-tooth voltage wave at a frequency of 24 cycles is applied across complementary plates 26, and a saw-tooth voltage wave at a frequency of 4320 cycles, for example, is applied across complementary plates 28.
  • the ray therefore, is deflected vertically 24 times a second by the plates 26, and is simultaneously deflected horizontally 4320 times a second by the plates 28.
  • the plates 26 and 28 are disposed within the tube, as represented, and may be carried by supporting elements (not shown) extending from the structure of the gun 20.
  • the projection of the image on the photosensitive surface I4 causes discrete electrostatic charges to be stored up over the surface, each elemental charge being proportionate to the light intensity at the elemental area. As the ray 24 scans the surface I4, these charges are 55 neutralized to .develop picture signals which are supplied to a radio or other transmitting system, (not shown).
  • the ray 24 would scan the surface Il over an area ABCD, as shown in Fig. 5. That is, the scanning pattern would be the shape of a keystone rather than the desired rectangle. This would cause, at the receiving station, the production of a distorted image on the fluorescent screen of the usual cathode ray tube, the vertical lines of the reproduced image being so inclined to each other that the entire image would have a generally keystone conguration.
  • the plates 28 are made to diverge outwardly from each other in the direction looking toward the screen l2, as more clearly shown in Fig. 3.
  • the edges 28e, which are nearer to the gun 20, are, therefore, closer together than the edges 28d.
  • the plates 26 are made to diverge outwardly from each other in the direction looking toward the screen i2, as more clearly shown in Fig.- 2.
  • the edges 26o of the plates, which are nearer to the gun 20, are therefore closer together than the edges 26d.
  • the amplitude of any horizontal deflection is slightly greater than the amplitude of the preceding horizontal deflection.
  • 'I'he ray 24 therefore, is caused to scan a keystone area such as EFGH in Fig. 5, in a plane perpendicular to the axis 22 and which is about the same distance from the gun 2U as the screen I2.
  • the result is that the ray scans the screen i2 over the desired rectangular area such as is represented in Fig. by the area JKLM.
  • the screen I2 is considered to be substantially eight inches from the tip of the gun 20, and to be inclined 60 degrees to the axis 22.
  • the respective angles of inclination of the plates 26 and 28 are determined according to the various dimensions and reguirements of any particular tube. In the particular tube shown, satisfactory results have been obtained with the respective angles about as shown and designated.
  • the embodiment of the invention would be the same as in the transmitting tube disclosed, but the front surface of the screen l2 would be coated with uorescent material, and the optical system I1 would be one which would project onto a relatively large, external screen, the image reproduced on the fluorescent screen.
  • a cathode ray tube comprising a substantially iiat screen and means for developing a scanning ray and directing the same at said screen, the axis of said ray-developing means being inclined at an angle to said screen whereby the part of the latter on one side of said axis is closer to said ray-developing means than the other part of said screen, and means for deflecting said ray simultaneously in different directions at relatively high and relatively low frequencies respectively to cause the ray to scan said screen over a substantially rectangular area, said defiecting means including complementary plates for deflecting the ray at the relatively high frequency and disposed within the tube on opposite sides of said axis, the adjacent edges of said plates on opposite sides of said axis being cut on a bias with respect to a plane perpendicular to said axis.
  • a cathode ray tube comprising screen structure, means for scanning said structure comprising means for developing a scanning ray and directlng the same at said structure, the axis of said ray-developing means being inclined at an acute angle to said structure, and means for deiiecting said ray simultaneously in different dlrections at relatively high and relatively low frequencies respectively to cause the ray to scan said structure over a substantially rectangular area, said defiecting means including complementary plates disposed on opposite sides of said axis for deilecting the ray at the relatively high frequency, the distance between said plates measured along said axis varying uniformly.
  • a cathode ray tube comprising a substantially fiat screen and means for developing a scanning ray and directing the same at said screen, the axis of said ray-developing means being inclined at an acute angle to said screen whereby the part of the latter on one side of said axis is closer to said ray-developing means than the other part of said screen, and means for deecting said ray simultaneously in different directions at relatively high and relatively low frequencies respectively to cause the ray to scan said screen overa substantially rectangular area, said deflecting means including complementary plates disposed on opposite sides of said axis for deflecting the ray at the relatively high frequency,
  • a cathode ray tube comprising a substantially flat screen and means for developing a scanning ray and directing the same at said screen, the axis. of said ray-developing' means being inclined at an angle to said screen whereby the part of the latter on one side of said axis is closer to said ray-developing means than the other part of said screen, and means for deflecting said ray simultaneously in diierent directions at relatively high and relatively low frequencies respectivelyto cause the ray to scan said screen over a. substantially rectangular area, said deiiecting means including complementary plates for deiiecting the ray at the relatively high frequency and disposed within the tube on opposite sides of said axis, the adjacent edges of said plates on opposite sides of said axis being inclined thereto.
  • a cathode ray tube comprising a substantially flat screen and means for developing a scanning 'ray and directing the same at said screen, the axis of said ray-developing means being inclined at an angle to said screen whereby the part oi the latter on one side of said axis is closer to said ray-developing means than the other part of said screen, and means for deflecting said ray' simultaneously in different directions at relatively high and relatively low frequencies respectively to cause the ray to scan said screen over a substantially rectangular area, said deilecting means including complementary plates for deflecting the ray at the relatively high frequency and disposed within the tube on opposite sides of said axis, the adjacent edges of said plates on opposite sides of said axis being inclined thereto at an angle of the order of forty degrees.

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US691671A 1932-09-30 1933-09-30 Cathode ray tube Expired - Lifetime US2069460A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL40870D NL40870C (en, 2012) 1933-09-30
US691671A US2069460A (en) 1933-09-30 1933-09-30 Cathode ray tube
FR45199D FR45199E (fr) 1932-09-30 1934-08-28 Système de télévision

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US691671A US2069460A (en) 1933-09-30 1933-09-30 Cathode ray tube

Publications (1)

Publication Number Publication Date
US2069460A true US2069460A (en) 1937-02-02

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ID=24777481

Family Applications (1)

Application Number Title Priority Date Filing Date
US691671A Expired - Lifetime US2069460A (en) 1932-09-30 1933-09-30 Cathode ray tube

Country Status (2)

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US (1) US2069460A (en, 2012)
NL (1) NL40870C (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716204A (en) * 1950-11-27 1955-08-23 Hartford Nat Bank & Trust Co Electron discharge device with deflection electrode system
US2758235A (en) * 1953-06-22 1956-08-07 Technicolor Motion Picture Means and techniques for preventing keystone effects

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716204A (en) * 1950-11-27 1955-08-23 Hartford Nat Bank & Trust Co Electron discharge device with deflection electrode system
US2758235A (en) * 1953-06-22 1956-08-07 Technicolor Motion Picture Means and techniques for preventing keystone effects

Also Published As

Publication number Publication date
NL40870C (en, 2012)

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