GB742789A - Improvements in or relating to television receivers - Google Patents

Improvements in or relating to television receivers

Info

Publication number
GB742789A
GB742789A GB1477652A GB1477652A GB742789A GB 742789 A GB742789 A GB 742789A GB 1477652 A GB1477652 A GB 1477652A GB 1477652 A GB1477652 A GB 1477652A GB 742789 A GB742789 A GB 742789A
Authority
GB
United Kingdom
Prior art keywords
coils
spot
screen
intermediate position
june
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
GB1477652A
Inventor
Eric William Bull
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB1477652A priority Critical patent/GB742789A/en
Publication of GB742789A publication Critical patent/GB742789A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
    • H04N3/34—Elemental scanning area oscillated rapidly in direction transverse to main scanning direction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

742,789. Cathode-ray tubes. ELECTRIC & MUSICAL INDUSTRIES, Ltd. June 12,1953 [June 12, 1952], No. 14776/52. Class 39 (1). In a cathode-ray tube the spot formed on the screen is elongated with its major dimension transverse to the picture lines when the focus control is adjusted to either side of an intermediate position. In the intermediate position where electrons approaching the screen in two planes at right angles focus at equal distances before and behind the screen, the spot is circular. In this position the current through spot elongating coils 1 and 2 is zero. On moving the focus control 4, 3 being the focusing coil, through the intermediate position, the current through coils 1 and 2 is reversed. Coils 1 and 2 may be in parallel with one another. A resistance may be inserted in the circuit in place of the coils, and the potential difference across the resistance amplified and applied to the coils. The spot may be elongated electrostatically instead of electromagnetically. Specification 665,096 is referred to.
GB1477652A 1952-06-12 1952-06-12 Improvements in or relating to television receivers Expired GB742789A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1477652A GB742789A (en) 1952-06-12 1952-06-12 Improvements in or relating to television receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1477652A GB742789A (en) 1952-06-12 1952-06-12 Improvements in or relating to television receivers

Publications (1)

Publication Number Publication Date
GB742789A true GB742789A (en) 1956-01-04

Family

ID=10047282

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1477652A Expired GB742789A (en) 1952-06-12 1952-06-12 Improvements in or relating to television receivers

Country Status (1)

Country Link
GB (1) GB742789A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142207A (en) * 1983-06-22 1985-01-09 Raytheon Co Pseudo-raster weather display apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142207A (en) * 1983-06-22 1985-01-09 Raytheon Co Pseudo-raster weather display apparatus
US4678969A (en) * 1983-06-22 1987-07-07 Raytheon Company Pseudo-raster weather display apparatus

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