DE2056122C3 - Circuit for setting the blue lateral convergence in color television receivers - Google Patents

Description

a) two transistors (4, 5) such a circuit _{w are} provided that the input sawtooth currents of the same polarity correspond to fields of the convergence coil (1) of opposite polarity,

b) the input electrode of each transistor is connected to a source (14) rising sawtooth current via a single-sided conductive element (16, 18) and via a further single-sided conductive element (17, 19) to a source (15) of falling sawtooth current, de, way that the positive or negative areas of a falling and a rising sawtooth current can be fed to each transistor,

c a selection device is provided), by the ^a5 each source (14, 15) is connectable to the input of one or the other transistor (4,5).

2. Circuit according to claim 1, characterized in that that the unilaterally conductive elements are diodes.

3. A circuit according to claim 1 or 2, characterized in that the selection device has two Contains potentiometer (8,9) with center tap.

4. A circuit according to claim 3, characterized in that the sources (14, 15) between The wiper and center tap of a potentiometer (8.9) are connected and that the ends each potentiometer via one of the diodes (16, 17, 18, 19) to the input electrodes of the transistors are connected.

5. Circuit according to one of claims 1 to 4, characterized in that the input electrodes of the transistors (4,5) each connected to one end of a potentiometer (7) are, between whose center tap and wiper a DC voltage source is connected.

6. A circuit according to claim 5, characterized in that the ends of the potentiometer (7) are connected to ground via a voltage divider (26, 27, 28, 29) each, at their taps (30, 31) the input electrodes of the transistors (4 and 5) are connected.

7. A circuit according to claim 5 or 6, characterized in that each pair of diodes (16, 17 or 18, 19) a voltage divider (32, 33 or 34, 35) is connected in parallel that the tap of a Voltage divider with one end of the potentiometer (7) and the tap of the other voltage divider is connected to the other end of the potentiometer (7).

8. A circuit according to any one of claims 1 to 7, characterized in that the Ausgangsclektroden of the transistors (4,5) are interconnected via the Konvergenzspulc (1), that an operating voltage is connected to a Mitteiabgriff (20) of the convergence coil (1) and that the two partial windings have different winding directions.

9. A circuit according to claim 1, characterized in that in parallel with the convergence coil (1) a resistor (6) is connected.

10. A circuit according to claim 3, characterized in that each potentiometer (8,9) with one end to the source (14) rising sawtooth current and the other end to the Source (15) falling sawtooth shape is connected and that the input circuits of the Transistors (4,5) are connected via the diodes (16, 17, 18, 19) between the slider and the center tap of the potentiometer (8,9).

11. A circuit according to claim 10, characterized in that the transistors (4, 5) are complementary transistors and that the convergence coil (1) consists of two coupled Teilwicklun device, which in the output! - «?; · each«; of the two transistors are switched on.

12. Circuit according to one of claims I to 11, characterized in that Jaß to avoid of trapezoidal errors, the control currents fed to the two transistors through currents of the respective other deflection direction modulates v, 'crden.

13. Circuit according to claim 12, characterized in that that the sawtooth currents of the sources (14, 15) are obtained from the deflection current.

The invention relates to a circuit for setting the blue lateral convergence in color television receivers with a Kunvergence coil through which approximately saw-wave-shaped currents flow.

It is known that in order to adjust the convergence of the electron beams of a multi-color picture tube, separate displacement devices are required for the three electron beams. For an exact convergence, the electron beams are shifted transversely to the beam direction in the direction of their common point of intersection. For one of the beams, for example for the blue electron beam, a lateral shift is required in addition to the shift in the direction of the cut point, which is generally referred to as a blue crystal correction. The shift of the three beams in the direction of the common intersection point and the lateral shift of the blue electron beam is usually caused by two different magnet units, which contain both permanent magnets and coils to achieve dynamic convergence, in the case of the blue lateral magnet for so-called dynamic blue lateral correction. It has been shown that a combination of static and dynamic blue lateral correction can lead to difficulties with regard to the setting. In addition, there is often the problem that not all errors can be compensated for by setting the Bhulateral correction. This is based on the knowledge that the jet and deflection systems can be asymmetrical.

The invention is based on the object of providing a dynamic blue lateral correction with separate input

ng to enable half-wave for the right and left halves of the picture (right Bödsehe).

In addition, the coupling of dynamic via the diodes with both

d ih Eitll idt d the

Kn In addition, the coupling of dynami upper

«: Can be reduced via and static setting. den ^ ^^ ^ _f ^ _hence “ _{ρ3εο U} ge des

a) two transistors of such a circuit provided storage circuit 4.5 in the manner of a ^^ " ₁ ! _fe , 5 are that the sawtooth applied to the input for the setting of both polarity "" in convergence "" flow fields of the same polarity of the convergence. The two separated eingesteUten "* ♦ ** Etnzspule opposite polarity correspond to be strengthened Sägezahnhalbwellen muet iwnver chen genzspulel back together to a Stromfunttion

Sengesett. where depending on the position <^ ϊ * « ^η0ο £ Γ

b) the input electrode of each transistor via _ter g 9 each transistor alone both half-waves (ta-

a unilaterally conductive element with a source _ra beicharacteristik) can transmit, but also everyone

rising sawtooth currents and, via a white _{transistor, only} one of the two half-waves (saga

one-sided conductive element with a ^ "characteristic) can transmit.

Source of falling sawtooth _{current connected The} static blue lateral convergence can

is such that each transistor carries the positive ^ ^ of _the ^, described circuit through

or negative areas of a falling and _an additional (not shown) coil made.

A rising sawtooth current can be supplied _{to the} beings of those mostly associated with it

are, relatively strong attenuation of the dynamic setting

c) a dialing device is provided .st. through the lung vwrd at "" / W "K * ildu ^ g der Emnuung jejede Source with the input of one or the other the convergenapule lc ur me

Trans.sto, connectable, st. One ^ ung ^ -E - ^ ^ ^

In order to explain the invention in more detail, one of the two transistors will be used

following an example! on the basis of the throughf osen. de ^ ^ mje ^, ^ n ^^ ^

Drawing described. This shows a circuit d> nam. £ ^hen * ^tU * ™ ^c _{T. ansistors} 4,5 through the

, ur setting of the blue lateral convergence with a ^ ^A ^ f. ¹ ^ "" ^, ^ change that the quiescent current around

in the usual (not shown) way on the neck, <> Ems.eller 7, 0 ^^^ f ^ 5 _{to 6} times

a cathode ray tube arranged Konver- twa das ^ s6facl «rgoht ^ ^ ^^ ^^

genzspulel with two. Connections 2.3. The an ™ ^e "" ^at . ^S ',: "! Or maybe The Grinder

fchluß2 is with the collector of a transistor 4. V erJ »'" «« «^ J ^ J also mgc« ^ ₂₂

the connection 3 with the collector of a Trans, - de ^ "gS 23 positive direct voltage

stors 5 connected. Be.de transistors are, 0 ge 35 mn erne ^ Q * ofe ends of the potentiometer?

switches that with the same input signals in the (T ⁴ Χΐ; ^ "" ^ _Γ capacitors 24, 25 high capacitance

^{Convergence coil} 1 fields of opposite polarity ⁵ '"ΰ .." ^η ^, ^β1 ^ ^Γ ^, ^ voltage divider 26. 27

be effected. The collectors are m.te.nander ^ f ^^ / ^^ '^, ^ ΓThe base electrodes of the

via a resistor for damping span or 28. 29 to mass uej £ > f _{31 the}

connected voltage peaks, which when switching over 4 »transistors 4 s smd at d ^ AbjnHe ^

des'stromes on Spu.e 1 can arise. The | Ρ ^ ^Π ^^ 'of the dvnamic attitude

Base electrodes of the transistors 4. s s.nd cm ge ^ ^ine . ^ ff st ^ fsch- attitude is avoided, in-

common adjuster? for setting the stat, - ^ urch the statically. ^ ¹ ™ « _{7 to the} connec-

blue lateral convergence and two. separate one to the: end, des ^ - ⁿ "°. ^m 3 _{or 34. 35}

f di Eiil d dite «BIaU 45 JÄ ^ * ^ id dß

European blue lateral convention g ^ "3 _{or 34} .

steller 8,9 for the classification of the dynamite «BIaU ₉ 45 JÄ ^ * ^ that

associated with lateral convergence. The Serious 7, 8 9 »8 ^^^ _{not through} the static em-

d Pit mass laid with- ° -e Aftscnro '^ i

associated with lateral convergence. D ^^^ _{not by} the static Em

are potentiometers with a mit- ° -e Aftscnro '^ change in the base voltage

telephone tap. The sliders of the adjusters8. > are position ^d v _Or i _e 7 _Da "m" _e rrd ™ n The resistor 21

happens via «C-links 10. 11 or 12. 13 with a source. ^v0 . ^r g ^tS P ^a Xm> derune of the company voltage

14 rising or one source 15 falling seed 5o is used for measuring the

via «C-members 10. 11 or 12. 13 with eir Q g .Xmderune the operating span

14 rising or a source 15 falling seed 5o is used for measuring the tooth voltages (or currents) connected in olge ™% to * ^e £ ™ ^? _A \ _eeahen ichcs with dem d dt center tapping are in means «·! - conversion of stat.scnen s

Tooth stresses (or currents) g % £ ^? ! _a \ _eeahen ichcs with the grounded center tap are in means "· - Change of stat.scnen s development of the potentiometers 8.9 the sawtooth regulator shorted 36 _ Sägeiahnströme in Abpraktisch, so do not appear on .. ^{D" C, h} .. ^dl ^ _der ^ "iis ^ other deflection direction Potentiometer output The Po ^""« ^ ^ere " ^{den are 55} S ^ ti i T z errors possible.

practically short-circuited, appear ..;, .. ^ of _the other deflection direction

Potentiometer output. The Po ^ "" «^ ^er ₁ ^e " ^de ₁ ⁿ _o ^{are 55} S ^ t Kor ekti vin T apezfehlem possible.

with the anodes each one diode 16. Π 18, 19 vcr- ¹ ^ ^εΐ ^^^ ^Γ J ^U _nd ü sawtooth currents 14, 15 from each-

bonds, the cathodes of which are derived from the base electrode of the * « ^8ε ^ ™ ^η ^ ^c . At one in the

Transistors 4 and 5 are connected. J ^ "^ J ^ ¹ ™ ^ are a leading example in which the

The cathodes of the Didoen 16, 17 mt of the Bas.selek practice tried out i » % , _{was for}

trode des Tran _S istors4 and the cathodes of the diodes 60 Venchmbujg l ^^ Ztörmigir peak current

18, 19 with the base electrode of the transistor 5 ver both half-waves em say β ^ ^

tied up. Through the diodes 16, 17 18 19 of 7M mAs, erre jh ^ The ^ g ^^^ _It

so only the positive sawtooth half-waves at ^α '%;"™ 5 ⁸ ^ corresponding arrangement one

the base electrodes of the ^ ^^ S ' ¹ -JVer ical direction switched as B amplifier.

₂ O ₅₆₁₂₂ ζ

will. Instead of the illustrated convergence coils with different winding directions Complementary transistors are used for the sub-coils, with a different operating voltage supply Pay attention to the transistors and the use of a convergence coil with two only inductively coupled partial coils. Finally, with a corresponding effort (e.g. when setting integrated circuits) the both sources 14, 15 by a source (e.g. 14) and the diodes 16 to 19 by correspondingly reversed polarity Diodes and isolation amplifiers are replaced.

1 sheet of drawings

Claims (1)

Patent claims: 1. Circuit for setting the BJaulateralconvergence in color television receivers with a of approximately sawtooth currents traversed convergence coil, characterized in that