GB1144186A - Improvements in scanning circuits for cathode-ray tubes - Google Patents

Improvements in scanning circuits for cathode-ray tubes

Info

Publication number
GB1144186A
GB1144186A GB5507766A GB5507766A GB1144186A GB 1144186 A GB1144186 A GB 1144186A GB 5507766 A GB5507766 A GB 5507766A GB 5507766 A GB5507766 A GB 5507766A GB 1144186 A GB1144186 A GB 1144186A
Authority
GB
United Kingdom
Prior art keywords
transistor
capacitors
circuit
dec
via resistor
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
GB5507766A
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of GB1144186A publication Critical patent/GB1144186A/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
    • H03K4/83—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices with more than two PN junctions or with more than three electrodes or more than one electrode connected to the same conductivity region
    • H03K4/84—Generators in which the semiconductor device is conducting during the fly-back part of the cycle
    • 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
    • H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
    • H03K4/60—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor
    • H03K4/69—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as an amplifier
    • H03K4/72—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as an amplifier combined with means for generating the driving pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K6/00—Manipulating pulses having a finite slope and not covered by one of the other main groups of this subclass
    • H03K6/04—Modifying slopes of pulses, e.g. S-correction

Landscapes

  • Details Of Television Scanning (AREA)

Abstract

1,144,186. Transistor sawtooth circuits. COMPAGNIE FRANCAISE THOMSON HOUSTON-HOTCHKISS BRANDT. 8 Dec., 1966 [8 Dec., 1965], No. 55077/66. Heading H3T. A field deflection circuit for a television receiver comprises a unijunction transistor oscillator coupled via a capacitive divider to an output transistor. As shown, the series capacitors C2 ... C4 charge via resistor R2 during each scan until unijunction transistor T1 breaks down, discharging the capacitors. The capacitors form a lower impedance drive to the output transistor T2. Feed back via resistor R3 to the junction of capacitors C3, C4, together with the effect of the finite time constant of the inductor L provides an S-shaped deflection current in the coils L2 as required for flat screen correction. Resistors R3, R5 respectively control linearity and amplitude. The circuit may be synchronized at A. Fig. 1 (not shown) relates to a known circuit in which capacitor C2 is omitted and an emitter follower interposed between point D and the base of transistor T2.
GB5507766A 1965-12-08 1966-12-08 Improvements in scanning circuits for cathode-ray tubes Expired GB1144186A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR41359A FR1467113A (en) 1965-12-08 1965-12-08 Improvements to cathode ray tube scanning circuits

Publications (1)

Publication Number Publication Date
GB1144186A true GB1144186A (en) 1969-03-05

Family

ID=8594754

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5507766A Expired GB1144186A (en) 1965-12-08 1966-12-08 Improvements in scanning circuits for cathode-ray tubes

Country Status (4)

Country Link
BE (1) BE690674A (en)
ES (1) ES334061A1 (en)
FR (1) FR1467113A (en)
GB (1) GB1144186A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4241265A (en) * 1977-08-31 1980-12-23 Rca Corporation Television vertical ramp generator
EP0241284B1 (en) * 1986-04-11 1992-12-30 RCA Thomson Licensing Corporation Television display system
GB8630921D0 (en) * 1986-12-24 1987-02-04 Rca Corp Vertical sawtooth generator

Also Published As

Publication number Publication date
FR1467113A (en) 1967-01-27
BE690674A (en) 1967-06-05
ES334061A1 (en) 1967-11-01

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