GB666527A - Improvements in or relating to television pick-up tubes or the like - Google Patents

Improvements in or relating to television pick-up tubes or the like

Info

Publication number
GB666527A
GB666527A GB19600/49A GB1960049A GB666527A GB 666527 A GB666527 A GB 666527A GB 19600/49 A GB19600/49 A GB 19600/49A GB 1960049 A GB1960049 A GB 1960049A GB 666527 A GB666527 A GB 666527A
Authority
GB
United Kingdom
Prior art keywords
electrode
target
mosaic
face
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
GB19600/49A
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.)
GEORGE STANLEY PERCIVAL FREEMA
Cinema Television Ltd
Original Assignee
GEORGE STANLEY PERCIVAL FREEMA
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 GEORGE STANLEY PERCIVAL FREEMA, Cinema Television Ltd filed Critical GEORGE STANLEY PERCIVAL FREEMA
Priority to GB19600/49A priority Critical patent/GB666527A/en
Priority to FR1020788D priority patent/FR1020788A/en
Priority to US175751A priority patent/US2726352A/en
Publication of GB666527A publication Critical patent/GB666527A/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
    • H01J31/34—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 cathode potential, e.g. orthicon
    • 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
    • H01J29/36—Photoelectric screens; Charge-storage screens
    • H01J29/39—Charge-storage screens
    • H01J29/41—Charge-storage screens using secondary emission, e.g. for supericonoscope
    • H01J29/413—Charge-storage screens using secondary emission, e.g. for supericonoscope for writing and reading of charge pattern on opposite sides of the target, e.g. for superorthicon

Landscapes

  • Discharge Lamps And Accessories Thereof (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)

Abstract

666,527. Cathode-ray tubes. CINEMATELEVISION, Ltd.; and FREEMAN, G. S. P. July 24, 1950 [July 26, 1949], No. 19600/49. Class 39 (i). A television pick-up tube comprises in combination a target electrode in the form of a thin semi-conducting layer which carries on one side thereof a photo-sensitive mosaic and is adapted to be scanned on the other side thereof with a low velocity scanning beam and a planar capacitative electrode in the form of a substantially transparent conducting film, positioned in close proximity to said target on the mosaic side thereof. As shown, a pick-up tube comprises an envelope 1 containing an electron gun 2, a solenoid 3 for focusing, and scan coils 4. The target consists of a diaphragm 5 of a semiconductor, such as glass or aluminium oxide suitably treated, which is sufficiently thin to enable electrical charges to leak from one face to the other in less than one frame period. One face of the target is scanned by the scanning beam and on the other face is deposited a mosaic 6 of photo-sensitive material which receives illumination through the flat window 7 at the end of the tube. On the inner face of the window, and mounted in close proximity to the target assembly is a capacitative electrode 8 consisting of a transparent conducting film. When light is focused on the mosaic elements, which will be the action of the low velocity scan have reached a potential near to that of the electron gun cathode, photo-electrons are emitted and are collected on the electrode 8, which is maintained slightly positive with respect to the gun cathode. It is stated that by a suitable choice of voltage for electrode 8 it can be ensured that even under the brightest illumination the secondary emission caused by the impact of the scanning beam never reaches a value greater than unity, and the unstable condition arising when a tube suddenly receives brilliant illumination is prevented. The position of the target relative to the electrode 8 may be adjustable by mechanical means, as described in Specification 666,526.
GB19600/49A 1949-07-26 1949-07-26 Improvements in or relating to television pick-up tubes or the like Expired GB666527A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB19600/49A GB666527A (en) 1949-07-26 1949-07-26 Improvements in or relating to television pick-up tubes or the like
FR1020788D FR1020788A (en) 1949-07-26 1950-06-26 Improvements to television analyzer tubes and the like
US175751A US2726352A (en) 1949-07-26 1950-07-25 Image-converting devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19600/49A GB666527A (en) 1949-07-26 1949-07-26 Improvements in or relating to television pick-up tubes or the like

Publications (1)

Publication Number Publication Date
GB666527A true GB666527A (en) 1952-02-13

Family

ID=10132078

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19600/49A Expired GB666527A (en) 1949-07-26 1949-07-26 Improvements in or relating to television pick-up tubes or the like

Country Status (3)

Country Link
US (1) US2726352A (en)
FR (1) FR1020788A (en)
GB (1) GB666527A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898499A (en) * 1956-05-23 1959-08-04 Westinghouse Electric Corp Transmission secondary emission dynode structure

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2322807A (en) * 1940-12-28 1943-06-29 Rca Corp Electron discharge device and system
US2404046A (en) * 1941-06-21 1946-07-16 Rca Corp Television transmitting apparatus
US2416720A (en) * 1943-01-30 1947-03-04 Bell Telephone Labor Inc Electrooptical device
US2540632A (en) * 1946-09-27 1951-02-06 Rca Corp Television image and pickup tube
US2544755A (en) * 1948-01-29 1951-03-13 Bell Telephone Labor Inc Electron camera tube
GB683603A (en) * 1948-02-18 1952-12-03 Emi Ltd Improvements in or relating to electron discharge pick-up tubes suitable for use in television

Also Published As

Publication number Publication date
FR1020788A (en) 1953-02-10
US2726352A (en) 1955-12-06

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