GB741649A - Improvements in or relating to television transmitting apparatus - Google Patents

Improvements in or relating to television transmitting apparatus

Info

Publication number
GB741649A
GB741649A GB1947654A GB1947654A GB741649A GB 741649 A GB741649 A GB 741649A GB 1947654 A GB1947654 A GB 1947654A GB 1947654 A GB1947654 A GB 1947654A GB 741649 A GB741649 A GB 741649A
Authority
GB
United Kingdom
Prior art keywords
photo
cathode
image
electron
spot scanner
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
GB1947654A
Inventor
Richard Theile
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.)
Pye Electronic Products Ltd
Original Assignee
Pye 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 Pye Ltd filed Critical Pye Ltd
Publication of GB741649A publication Critical patent/GB741649A/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
    • H01J31/265—Image pick-up tubes having an input of visible light and electric output with light spot scanning
    • 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
    • H01J29/023—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof secondary-electron emitting electrode arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/257—Picture signal generators using flying-spot scanners

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

741,649. Television pick-up tubes. PYE, Ltd. Sept. 8, 1952 [Sept. 6, 1951], No. 19476/54. Divided out of 741,592, [Group XL (b)]. Class 39 (1). Relates to a television pick-up tube of the image iconoscope type described in Specification 656,069 comprising a photo-cathode 6 and a target electrode 8 which is scanned by means of a beam of electrons released by a flying spot scanner 1 scanning the photo-cathode. According to the invention an electron multiplier 22 is provided facing the photo-cathode so as to be responsive to the electron emission therefrom. A second electron multiplier 21 faces the target electrode. The tube may be operated either as a conventional storage tube or as a photocell. For operation as a storage tube a scene 16 is projected on to the photo-cathode and the flying spot scanner is arranged to scan the same area as that occupied by the scene. The stored charges produced on the target 8 are discharged in turn by the scanning beam of electrons released by the flying spot scanner and the discharge current, which constitutes the image signal, is fed to the amplifier 14 through the electron multiplier 21. For operation as a photo-cell, a transparency, such as kinema film 17, is inserted in the light beam from the flying spot scanner 1 and the output signal is derived through amplifier 19 from the photo-emission received from the photo-cathode by electron multiplier 22. During such operation, coil 10 employed normally for focusing the electron image on the target 8 is preferably not energized. According to a further feature of the invention, the target 8 and its associated signal plate 9 are made semi-transparent, whereby light from an image may be projected on to the rear of the photo-cathode alternatively or simultaneously with the light from image 16. The electron multipliers may be constructed as described' in Specification 721,943. Apparatus incorporating the pick-up tube and arranged to be operated either as a flying- spot scanner or a storage-type pick-up device forms one subject of Specification 741,592, [Group XL (b)].
GB1947654A 1951-09-06 1951-09-06 Improvements in or relating to television transmitting apparatus Expired GB741649A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2108451A GB741592A (en) 1951-09-06 1951-09-06 Improvements in or relating to television transmitting apparatus

Publications (1)

Publication Number Publication Date
GB741649A true GB741649A (en) 1955-12-07

Family

ID=10156927

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2108451A Expired GB741592A (en) 1951-09-06 1951-09-06 Improvements in or relating to television transmitting apparatus
GB1947654A Expired GB741649A (en) 1951-09-06 1951-09-06 Improvements in or relating to television transmitting apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB2108451A Expired GB741592A (en) 1951-09-06 1951-09-06 Improvements in or relating to television transmitting apparatus

Country Status (2)

Country Link
DE (1) DE925176C (en)
GB (2) GB741592A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB969138A (en) * 1961-12-25 1964-09-09 Hitachi Ltd Colour picture cathode-ray tubes
BE630375A (en) * 1962-03-30

Also Published As

Publication number Publication date
DE925176C (en) 1955-03-14
GB741592A (en) 1955-12-07

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