GB642533A - Light intensity filter system for cathode ray tube devices - Google Patents

Light intensity filter system for cathode ray tube devices

Info

Publication number
GB642533A
GB642533A GB20238/46A GB2023846A GB642533A GB 642533 A GB642533 A GB 642533A GB 20238/46 A GB20238/46 A GB 20238/46A GB 2023846 A GB2023846 A GB 2023846A GB 642533 A GB642533 A GB 642533A
Authority
GB
United Kingdom
Prior art keywords
filter
produced
july
indications
display
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
GB20238/46A
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB642533A publication Critical patent/GB642533A/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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/04—Display arrangements
    • G01S7/06—Cathode-ray tube displays or other two dimensional or three-dimensional displays
    • 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
    • H01J2229/8913—Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices
    • 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
    • H01J2229/8926—Active components, e.g. LCD's, indicators, illuminators and moving devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

642,533. Cathode-ray oscillographs. STANDARD TELEPHONES & CABLES, Ltd. July 6, 1946, Nos. 20238 and 20239. Convention dates, July 9, 1945, and July 14, 1945. [Class 37] [Also in Groups XL (a) and XL (c)] A plan-position indicator display in a radar system is associated with a light-filter which is mounted in front of the display and rotates in synchronism with the rotating radial trace thereof. In the embodiment described the filter is graded so that maximum attenuation of the indications occurs just after they are produced and the filter density then decreases uniformly until no attenuation occurs just before the next '' paint," so that as the indications fade they are attenuated progressively less and an appearance of a constant intensity display is produced. Moreover, indications produced during the previous aerial scan by objects which have since disappeared are rendered invisible by the high density of the filter as the radial trace passes. The Specification as open to inspection under Sect. 91 also describes filter discs, as shown for example in Fig. 10A (Cancelled), comprising a narrow radially-extending filter portion which may be used to reduce the intensity of the brilliant blue line produced by the rotating radial trace without attenuating the afterglow. A filter-disc having a narrow diametrically-extending portion is also described. This subject-matter does not appear in the Specification as accepted.
GB20238/46A 1945-07-09 1946-07-06 Light intensity filter system for cathode ray tube devices Expired GB642533A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US642533XA 1945-07-09 1945-07-09

Publications (1)

Publication Number Publication Date
GB642533A true GB642533A (en) 1950-09-06

Family

ID=22054626

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20238/46A Expired GB642533A (en) 1945-07-09 1946-07-06 Light intensity filter system for cathode ray tube devices

Country Status (3)

Country Link
BE (1) BE467895A (en)
FR (1) FR931098A (en)
GB (1) GB642533A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1089202B (en) * 1956-08-29 1960-09-15 Grundig Max Control device with electrical display and registration device
DE1216555B (en) * 1958-02-05 1966-05-12 Philips Patentverwaltung Radar viewer
EP0533538A1 (en) * 1991-09-20 1993-03-24 Thomson Tubes Electroniques Image intensifier tube with brightness correction

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1089202B (en) * 1956-08-29 1960-09-15 Grundig Max Control device with electrical display and registration device
DE1216555B (en) * 1958-02-05 1966-05-12 Philips Patentverwaltung Radar viewer
EP0533538A1 (en) * 1991-09-20 1993-03-24 Thomson Tubes Electroniques Image intensifier tube with brightness correction
FR2681727A1 (en) * 1991-09-20 1993-03-26 Thomson Tubes Electroniques IMAGE INTENSIFIER TUBE WITH BRILLIANCE CORRECTION.
US5248874A (en) * 1991-09-20 1993-09-28 Thomson Tubes Electroniques Image intensifier tube with correction of brightness at the output window

Also Published As

Publication number Publication date
FR931098A (en) 1948-02-12
BE467895A (en)

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