GB402629A - Improvements in or relating to television systems - Google Patents

Improvements in or relating to television systems

Info

Publication number
GB402629A
GB402629A GB5967/33A GB596733A GB402629A GB 402629 A GB402629 A GB 402629A GB 5967/33 A GB5967/33 A GB 5967/33A GB 596733 A GB596733 A GB 596733A GB 402629 A GB402629 A GB 402629A
Authority
GB
United Kingdom
Prior art keywords
current
valve
grid
circuit
saw
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
GB5967/33A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co 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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB402629A publication Critical patent/GB402629A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
    • H03K4/28—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device
    • H03K4/32—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device combined with means for generating the driving pulses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
    • H04N5/123—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal directly commands a frequency generator

Abstract

402,629. Television. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London.-(Assignees of Tolson, W. A. ; 631, Jefferson Avenue, Erlton, and Duncan, J. R.; 341, N. 41st Street, Camden, both in New Jersey, U.S.A.) Feb. 27, 1933, No. 5967. Convention date, Feb. 27, 1932. [Classes 40 (iii) and 40 (v).] A saw-tooth or other special wave form 40 for controlling a cathode ray 15 is generated by means of a back-coupled thermionic valve 20, 20a. When current begins to flow through the valve, the positive coupling between the anode coil 21<1> and the grid coil 23 causes the current to increase to saturation and then to decrease to zero. Grid current, flowing while the grid is positive 29, accumulates on a condenser 22 and prevents another current impulse until the charge has sufficiently leaked away through a resistance 24. This period is slightly longer than the period between synchronising signals, which make the grid potential sufficient to start the next current impulse. The current impulses 30, 31 are passed by a transformer 21 to a rectifying-valve 32, which produces negative peaks 34 in its anode circuit. A condenser 35 and resistances 36, 37 alter these peaks to the form 39, which is amplified by a valve 38 to develop a saw-tooth current 40, which is passed through coils 17 to deflect the ray 15 horizontally. The current for vertical deflection is derived from a similar valve circuit 19a with an appropriate time constant for the circuit 22a, 24a. The synchronising signals 28, 48, controlling the horizontal and vertical movement respectively, differ in the steepness of their wave front, as described in Specification 395,499, and are separated by a filter 47. Specification 394,597 also is referred to.
GB5967/33A 1932-02-27 1933-02-27 Improvements in or relating to television systems Expired GB402629A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US595484A US2101520A (en) 1932-02-27 1932-02-27 Oscillator for use with kinescope deflecting circuits

Publications (1)

Publication Number Publication Date
GB402629A true GB402629A (en) 1933-12-07

Family

ID=24383424

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5967/33A Expired GB402629A (en) 1932-02-27 1933-02-27 Improvements in or relating to television systems

Country Status (4)

Country Link
US (1) US2101520A (en)
BE (1) BE394636A (en)
FR (1) FR750607A (en)
GB (1) GB402629A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE893663C (en) * 1938-12-09 1953-10-19 Telefunken Gmbh Circuit arrangement for the phase shifting of pulses, in particular for television purposes

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563487A (en) * 1951-08-07 Television receiver synchronizing
BE445079A (en) * 1941-04-03
US2453711A (en) * 1942-07-30 1948-11-16 Sperry Corp Cathode-ray tube control circuit
US2474219A (en) * 1942-09-14 1949-06-28 Standard Telephones Cables Ltd Pulse generating system
US2423304A (en) * 1944-02-15 1947-07-01 Gen Electric Pulse producing system
US2508926A (en) * 1947-08-28 1950-05-23 Rca Corp Cathode-ray beam deflection circuit
US2599798A (en) * 1950-01-13 1952-06-10 Avco Mfg Corp Linearity control circuit for television receivers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE893663C (en) * 1938-12-09 1953-10-19 Telefunken Gmbh Circuit arrangement for the phase shifting of pulses, in particular for television purposes

Also Published As

Publication number Publication date
US2101520A (en) 1937-12-07
BE394636A (en)
FR750607A (en) 1933-08-14

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