GB669523A - Improvements in or relating to television and like cameras - Google Patents

Improvements in or relating to television and like cameras

Info

Publication number
GB669523A
GB669523A GB95849A GB95849A GB669523A GB 669523 A GB669523 A GB 669523A GB 95849 A GB95849 A GB 95849A GB 95849 A GB95849 A GB 95849A GB 669523 A GB669523 A GB 669523A
Authority
GB
United Kingdom
Prior art keywords
cathode
mark
area
occupied
photo
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
GB95849A
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.)
Cinema Television Ltd
Original Assignee
Cinema Television Ltd
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 Cinema Television Ltd filed Critical Cinema Television Ltd
Priority to GB95849A priority Critical patent/GB669523A/en
Priority to FR1008164D priority patent/FR1008164A/en
Publication of GB669523A publication Critical patent/GB669523A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/26—Image pick-up tubes having an input of visible light and electric output
    • H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
    • H01J31/30—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at anode potential, e.g. iconoscope
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/26—Image pick-up tubes having an input of visible light and electric output

Landscapes

  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

669,523. Cathode-ray tubes. CINEMATELEVISION, Ltd., and JOHNSON, L. R. J. Dec. 6, 1949 [Jan. 13, 1949], No. 958/49. Class 39 (i). [Also in Group XL (b)] In an image iconoscope the area 3 on the target electrode which is occupied by the electron image from the photo-cathode 2 is restricted to less than the area which is scanned by the electron beam by means of a mark 6 positioned in the optical system between the object lens 1 and the photo-cathode. With this arrangement a signal corresponding to the true " black " level is produced when the electron beam scans the area not occupied by the electron image and the picture signal may be " clamped " to this signal by known means. The marking may be effected by positioning a suitably-apertured metal plate immediately adjacent the window of the tube or by placing an equivalent mark at an intermediate point in the optical system. The size of the mark may be adjustable.
GB95849A 1949-01-13 1949-01-13 Improvements in or relating to television and like cameras Expired GB669523A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB95849A GB669523A (en) 1949-01-13 1949-01-13 Improvements in or relating to television and like cameras
FR1008164D FR1008164A (en) 1949-01-13 1950-01-10 Television Camera Improvements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB95849A GB669523A (en) 1949-01-13 1949-01-13 Improvements in or relating to television and like cameras

Publications (1)

Publication Number Publication Date
GB669523A true GB669523A (en) 1952-04-02

Family

ID=9713488

Family Applications (1)

Application Number Title Priority Date Filing Date
GB95849A Expired GB669523A (en) 1949-01-13 1949-01-13 Improvements in or relating to television and like cameras

Country Status (2)

Country Link
FR (1) FR1008164A (en)
GB (1) GB669523A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE952722C (en) * 1952-03-17 1956-11-22 Cfcmug Scan storage tubes with secondary emission and a recording and / or a reading beam

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2564639B1 (en) * 1984-05-18 1987-05-15 Thomson Csf COVER FOR TELEVISION CAMERA TUBE AND TELEVISION CAMERA COMPRISING SUCH A COVER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE952722C (en) * 1952-03-17 1956-11-22 Cfcmug Scan storage tubes with secondary emission and a recording and / or a reading beam

Also Published As

Publication number Publication date
FR1008164A (en) 1952-05-14

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