US2479458A - Image receiving cathodic tube - Google Patents

Image receiving cathodic tube Download PDF

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Publication number
US2479458A
US2479458A US651401A US65140146A US2479458A US 2479458 A US2479458 A US 2479458A US 651401 A US651401 A US 651401A US 65140146 A US65140146 A US 65140146A US 2479458 A US2479458 A US 2479458A
Authority
US
United States
Prior art keywords
tube
image
caesium
image receiving
cathodic
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
US651401A
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English (en)
Inventor
Barthelemy Rene
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.)
Compteurs Schlumberger SA
Original Assignee
Compteurs Schlumberger SA
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 claimed from GB1189044A external-priority patent/GB587125A/en
Application filed by Compteurs Schlumberger SA filed Critical Compteurs Schlumberger SA
Application granted granted Critical
Publication of US2479458A publication Critical patent/US2479458A/en
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
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • H04N5/7425—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being a dielectric deformable layer controlled by an electron beam, e.g. eidophor projector

Definitions

  • the present invention relates to a cathodic tube for receiving images; this new cathodic tube, also called cathode-ray or cathode-beam tube permits of receiving images transmitted at a distance.
  • This tube can be utilized in two ways according to conditions of working, either as a relay of light interposed between a powerful source of light and a screen, in order to insure reception on a large screen of televised animated images, transmitted in a known manner; or as a receiver delivering a persistent image, with an eye to special applications, such as safeguarding the secret of transmitted images
  • the invention is characterized by the utilization, instead of the fluorescent screen of the cathode-ray tubes, of an opaque and very thin layer of a volatile substance and in particular an alkali metal, for instance caesium.
  • the whole of the cathodic tube-excepting the surface swept by the cathode-beam in a known manner- is placed in a drying oven brought up to a temperature approximately between 100 and 200 centigrades-degrees.
  • the volatile and opaque substance for instance the caesium contained in the tube
  • the volatile and opaque substance is bound to condense as an opaque and non-uniform layer upon the non-heated portion, that may eventually be cooled by air or water circulation.
  • the invention may be utilized for obtaining persistent images, for instance for the secret transmission of written messages. It is only necessary therefor to adjust the conditions of working, i. e. power of the beam and temperatures, to have for the caesium a long recondensa- 2 1. tion time, to wit, of the order of severalmicroseconds. To blot out the image entirely and to build again an uniform layer of caesium, requires only a thorough scanning by means of 'apowerful beam, in order to evaporate momentarily all the caesium that is bound to condense back again uniformly a few seconds after. j
  • Figure 1 is an embodiment of a device according to the inventionr
  • Figure 2 is a schematic drawing showing the formation of the image in the case of a modulation in diameter of the cathode-beam;
  • Figures 3 and 4 are two devices to project the enlarged image of the image formed on the receiving surface of the cathodic tube.
  • the said tube I encloses an electronic gun 3 with its two pairs of deflecting plates 4 and 5.
  • the whole apparatus is void of air and treated according to the classical methods used for cathodic tubes.
  • an alkali-metal e. g. caesium.
  • the rectangle non-enclosed in the oven may eventually be cooled by air or water circulation I.
  • the beam it is also possible to cause the beam to vary its diameter, without varying its intensity, by applying, for instance, the modulation at the electrode of concentration of the cathodic tube.
  • the beam evaporates a furrow of caesium equal to its diameter at every point, as is schematically represented in Figure 2 where a and b are two successive lines.
  • a and b are two successive lines.
  • the-speed of recondensation of caesium depends upon the temperature of the drying oven and the means of cooling.
  • the duration of recondensae tion has to be slightly less than the durationof one image.
  • theiimage may be blotted out by sweeping plate-glass 2 by the non-modulated beam.
  • the layer of: caesium is rebuilt afterwards uniformly.
  • figs. 3 and 4 show two instances of devices according to the invention, wherein the surface containing the layer of condensedrcaesium is interposed in the path ,of, a powerful beam of.light.
  • these l twoijfi uresg numbersi havel the :same .meaning as jSflisa luminous source, C a condenser, O an"'objec assjE a 'screen.
  • the device acv. colfdi l ".tog".
  • Number 4 beam in order to cause the image to become visible by variation of opacity of the said surface and-Ma ,heated chamber where 'the said tube is placediinssuch alf manrier that the said receiving surface is exterior to the said chamber so as to 1 adjust the conditions of volatilization and condensationof the said volatile substance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US651401A 1942-12-15 1946-03-01 Image receiving cathodic tube Expired - Lifetime US2479458A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2479458X 1942-12-15
GB1189044A GB587125A (en) 1944-06-22 1944-06-22 Improvements in or relating to cathode ray tubes for use in television reception

Publications (1)

Publication Number Publication Date
US2479458A true US2479458A (en) 1949-08-16

Family

ID=32232299

Family Applications (1)

Application Number Title Priority Date Filing Date
US651401A Expired - Lifetime US2479458A (en) 1942-12-15 1946-03-01 Image receiving cathodic tube

Country Status (2)

Country Link
US (1) US2479458A (enrdf_load_stackoverflow)
FR (1) FR962782A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2969474A (en) * 1956-03-19 1961-01-24 Westinghouse Electric Corp Kinescope screen for daylight viewing
US3167765A (en) * 1961-06-13 1965-01-26 Vincent D Stabilito Phase-comparison monopulse radar
US4529905A (en) * 1979-06-07 1985-07-16 Sony Corporation Cathode ray tube apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH544465A (de) * 1971-01-12 1973-11-15 Eidophor Ag Verfahren und Vorrichtung zur Wiedergabe von Fernsehbildern

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2242644A (en) * 1937-06-07 1941-05-20 Rca Corp Luminescent screen
US2281637A (en) * 1938-04-02 1942-05-05 Thomas W Sukumlyn Cathode ray television receiver
US2315113A (en) * 1940-09-07 1943-03-30 Farsworth Television And Radio Television projection system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2242644A (en) * 1937-06-07 1941-05-20 Rca Corp Luminescent screen
US2281637A (en) * 1938-04-02 1942-05-05 Thomas W Sukumlyn Cathode ray television receiver
US2315113A (en) * 1940-09-07 1943-03-30 Farsworth Television And Radio Television projection system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2969474A (en) * 1956-03-19 1961-01-24 Westinghouse Electric Corp Kinescope screen for daylight viewing
US3167765A (en) * 1961-06-13 1965-01-26 Vincent D Stabilito Phase-comparison monopulse radar
US4529905A (en) * 1979-06-07 1985-07-16 Sony Corporation Cathode ray tube apparatus

Also Published As

Publication number Publication date
FR962782A (enrdf_load_stackoverflow) 1950-06-20

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