US2211843A - Cathode ray tube - Google Patents

Cathode ray tube Download PDF

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Publication number
US2211843A
US2211843A US188876A US18887638A US2211843A US 2211843 A US2211843 A US 2211843A US 188876 A US188876 A US 188876A US 18887638 A US18887638 A US 18887638A US 2211843 A US2211843 A US 2211843A
Authority
US
United States
Prior art keywords
screen
incandescent
cathode ray
lines
picture
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
US188876A
Other languages
English (en)
Inventor
Bouwers Albert
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
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2211843A publication Critical patent/US2211843A/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
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/16—Incandescent screens

Definitions

  • the material In the short period of time'during which the screen portions are struck by the rays in one movement of the cathode ray beam over the incandescent screen, the material must be heated to the required temperature of incandescence.
  • the cooling which is due to thermal radiation, must take place in a fraction of one second, that is to say in the lapse of time between two complete scannings of the picture.
  • the invention is based on the recognition that this phenomenon has to be ascribed to an effacement of the diiferences in brilliancy produced on the incandescent screen (referred to hereinafter as broadening of the lines) which is harmful broadening of the lines is avoided by reducing the thermal conduction in the incandescent screen.
  • Incandescent screens which are perforated according to Figs. 2 and 3 or in any other suitable manner may have a thickness up to 6 microns without harmful broadening of the lines occurring. With this thickness a lower temperature, for example 2200 K., is sufiicient. They may consequently consist of tantalum or of any other metal or alloy which is capable of withstanding this temperature.
  • said solid plane sheet of material comprises tungsten, having open' perforations thereon in such configuration as to divide said material into substantially square sections.

Landscapes

  • Transforming Electric Information Into Light Information (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US188876A 1936-10-23 1938-02-05 Cathode ray tube Expired - Lifetime US2211843A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE482704X 1936-10-23

Publications (1)

Publication Number Publication Date
US2211843A true US2211843A (en) 1940-08-20

Family

ID=6542870

Family Applications (1)

Application Number Title Priority Date Filing Date
US188876A Expired - Lifetime US2211843A (en) 1936-10-23 1938-02-05 Cathode ray tube

Country Status (5)

Country Link
US (1) US2211843A (en(2012))
BE (1) BE424211A (en(2012))
FR (1) FR828098A (en(2012))
GB (1) GB482704A (en(2012))
NL (1) NL49665C (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532175A (en) * 1944-03-31 1950-11-28 Rca Corp Visible image radio responsive device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532175A (en) * 1944-03-31 1950-11-28 Rca Corp Visible image radio responsive device

Also Published As

Publication number Publication date
GB482704A (en) 1938-04-04
NL49665C (en(2012))
FR828098A (fr) 1938-05-10
BE424211A (en(2012))

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