GB565694A - Improvements in cathode ray tubes and in visual indicating systems for apparatus including cathode ray tubes - Google Patents

Improvements in cathode ray tubes and in visual indicating systems for apparatus including cathode ray tubes

Info

Publication number
GB565694A
GB565694A GB845340A GB845340A GB565694A GB 565694 A GB565694 A GB 565694A GB 845340 A GB845340 A GB 845340A GB 845340 A GB845340 A GB 845340A GB 565694 A GB565694 A GB 565694A
Authority
GB
United Kingdom
Prior art keywords
cathode ray
ray tubes
light
ray tube
violet
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
Application number
GB845340A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 BE476133D priority Critical patent/BE476133A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB845340A priority patent/GB565694A/en
Publication of GB565694A publication Critical patent/GB565694A/en
Expired legal-status Critical Current

Links

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
    • H01J29/18—Luminescent screens
    • H01J29/34—Luminescent screens provided with permanent marks or references
    • 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

Abstract

565,694. Colour filters. STANDARD TELEPHONES & CABLES, Ltd., and WOLFSON, H. May 10, 1940, No. 8453. [Class 97 (i)] [Also in Group XL] The fluorescent screen in a cathode ray tube is protected from ultra-violet rays by a light filter which is permeable to visible light and impermeable to light at and beyond the violet end of the spectrum, so that the cathode ray tube may form one element, such as a beaming indicator, of a visual indicating system comprising other elements which are coated with luminescent paint rendered luminous in the dark by ultra-violet light. The filter may be separate from cathode-ray tube and may consist of a medium such as nitro-cellulose, celluloid, cellulose acetate, or a transparent resin, incorporating a small quantity of a yellow dye, such as picric acid or sodium picrate, which gives the required absorption of ultraviolet radiation.
GB845340A 1940-05-10 1940-05-10 Improvements in cathode ray tubes and in visual indicating systems for apparatus including cathode ray tubes Expired GB565694A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE476133D BE476133A (en) 1940-05-10
GB845340A GB565694A (en) 1940-05-10 1940-05-10 Improvements in cathode ray tubes and in visual indicating systems for apparatus including cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB845340A GB565694A (en) 1940-05-10 1940-05-10 Improvements in cathode ray tubes and in visual indicating systems for apparatus including cathode ray tubes

Publications (1)

Publication Number Publication Date
GB565694A true GB565694A (en) 1944-11-23

Family

ID=9852778

Family Applications (1)

Application Number Title Priority Date Filing Date
GB845340A Expired GB565694A (en) 1940-05-10 1940-05-10 Improvements in cathode ray tubes and in visual indicating systems for apparatus including cathode ray tubes

Country Status (2)

Country Link
BE (1) BE476133A (en)
GB (1) GB565694A (en)

Also Published As

Publication number Publication date
BE476133A (en)

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