CN1469418A - Deflecting coil - Google Patents
Deflecting coil Download PDFInfo
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- CN1469418A CN1469418A CNA031425437A CN03142543A CN1469418A CN 1469418 A CN1469418 A CN 1469418A CN A031425437 A CNA031425437 A CN A031425437A CN 03142543 A CN03142543 A CN 03142543A CN 1469418 A CN1469418 A CN 1469418A
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- field correction
- coil
- correction coil
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- 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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/70—Arrangements for deflecting ray or beam
- H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
- H01J29/702—Convergence correction arrangements therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/56—Correction of beam optics
- H01J2229/568—Correction of beam optics using supplementary correction devices
- H01J2229/5681—Correction of beam optics using supplementary correction devices magnetic
- H01J2229/5687—Auxiliary coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/70—Electron beam control outside the vessel
- H01J2229/703—Electron beam control outside the vessel by magnetic fields
- H01J2229/7032—Conductor design and distribution
- H01J2229/7033—Winding
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- 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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/70—Arrangements for deflecting ray or beam
- H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
- H01J29/76—Deflecting by magnetic fields only
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- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
A correction circuit 15A consists of: first to fourth magnetic field correction coils 1 to 4; and a 3-terminal variable resistor 20, and is configured such that a series circuit comprising the first and the second magnetic field correction coils 1, 2 is connected in parallel with a series circuit of the fourth and the third magnetic field correction coils 4, 3 connected to two respective fixed terminals of the 3-terminal variable resistor 20, the moving terminal T1 is connected to a connecting point P of the first and second magnetic field correction coils 1, 2, vertical deflection coils 12, 13 are connected in series with the first and second magnetic field correction coils 1, 2, the first and third magnetic field correction coils 1, 3 are wound on a first core 14A, the second and fourth magnetic field correction coils 2, 4 are wound on a second core 14B, and the first and second cores 14A, 14B are placed opposite to each other while sandwiching a neck part 51c.
Description
Technical field
The present invention relates to used deflecting coil in the image display device that television receiver and display unit etc. adopt color picture tubes, relate in particular to the structure that convergence errors is proofreaied and correct.
Background technology
Employing is installed to the colored receiving tube that 3 electron gun in-lines on the neck arrange to deflecting coil (hereinafter to be referred as CRT: in image display device cathode ray tube), for R (red), G (green), 3 electron beams of B (orchid) of launching from 3 electron guns are converged to (on the picture) on the panel well, one of its method is to adopt the deflecting coil of auto-convergence mode.
The deflecting coil of this auto-convergence mode generally is to be made of up and down a pair of horizontal deflection coil and pair of right and left frame deflector coil, utilizes these deflecting coils to form the horizontal deflection magnetic field of pincushion and barrel-shaped vertical deflection magnetic field, obtains good convergence characteristics.
But actual mass-produced deflecting coil owing to the characteristic deviation of deflecting coil etc. produces convergence errors, so magnetic sheet is pasted on the appropriate location of deflecting coil or utilize the correcting circuit of installing to change magnetic field, is proofreaied and correct this convergence errors with this.
The representative convergence errors that Figure 14 (a), Figure 14 (b) expression produces because of the deviation of vertical deflection magnetic field.
The convergence errors figure of Figure 14 (a) expression so-called " R of Y-axis (red) is left-leaning "; And, Figure 14 (b) expression so-called " R of Y-axis (red) Right deviation is fallen " convergence errors figure.Solid line among the figure is represented the bright line of the ordinate of R (red); Dotted line is represented the bright line of the ordinate of B (orchid).
Usually, these convergence errors are generically and collectively referred to as YH intersection convergence errors.
Be illustrated in Figure 10 for proofreading and correct one of this YH intersection convergence errors correcting circuit usefulness, the past.In the figure, in the output of vertical deflection circuit 156, be connected in series a pair of frame deflector coil 112,113 and correcting circuit 115.
Correcting circuit 115 is with the 1st, the 2nd magnetic field correction coil 101,102 that is connected in series, and has connected the circuit of the movable terminal T1 of 3 terminal variable resistances 20 on this contact P by resistor 111.And the direction that makes the vertical yoke current of electron beam under the situation of picture upside deflection is represented with the arrow S1 of solid line; The arrow S2 of the direction with dashed lines of the vertical yoke current under the situation of picture downside deflection represents.
The deflecting coil of this correcting circuit 115 has been installed in expression in Figure 16.
Magnetic field correction coil 101 is wrapped on the U shaped iron core 114A, is arranged in as shown in figure 16 on the Y-axis of upside of trunnion axis (X-axis) of deflecting coil neck 151c.
On the other hand, magnetic field correction coil 102 is the same with magnetic field correction coil 101, is wrapped on the U shaped iron core 114B, is arranged to mutually opposed with 114A unshakable in one's determination on the Y-axis of the downside of above-mentioned X-axis.
In this structure, make the change in resistance of variable resistance 20, YH intersection convergence errors is proofreaied and correct.
Summary of the invention
But, in the deflecting coil of auto-convergence mode, because the barrel-shaped vertical deflection magnetic field that from frame deflector coil, takes place, shown in Figure 15 (a), the horizontal line (among the figure for dotted line) that produces a kind of G (green) be displaced to R (red) and B (orchid) horizontal line the inboard be commonly referred to the convergence errors that VCR narrows down.
Therefore, utilize magnetic field correction coil 101,102 that the pincushion field takes place, provide the vertical deflection power that adds than R (red) and B (orchid) beam intensity, like this, the VCR convergence errors that narrows down is proofreaied and correct to G (green).Below utilize Figure 10～Figure 13 that this correction is described.
Figure 11～Figure 13 is the summary sectional drawing of watching from the screen side, and its position is to have arranged 114A unshakable in one's determination, 114B under the state on the neck that the deflecting coil in past shown in Figure 16 is installed in CRT54.Figure 11 (a)～Figure 13 (a) represents when the upside deflection of picture; Figure 11 (b)～Figure 13 (b) represents when the deflection of picture downside.
The movable terminal T1 that Figure 11 (a) and Figure 11 (b) are illustrated in 3 terminal variable resistances 20 is positioned under the situation at center, electron beam when picture upside and downside deflection, therefore magnetic field M1, the M2 that magnetic field correction coil 101,102 is produced and the power and the direction thereof that electron beam are subjected to.
Figure 12 (a) and Figure 12 (b) expression make the movable terminal T1 of 3 terminal variable resistances 20 leave under the last direction (arrow 16) of the mind-set Figure 10 situation about moving, electron beam magnetic field correction coil 101,102 is produced when picture upside and downside deflection magnetic field M1, M2 and so power and direction thereof that electron beam is subjected to.
Figure 13 (a) and Figure 13 (b) expression make the movable terminal T1 of 3 terminal variable resistances 20 leave under the following direction (arrow 17) of the mind-set Figure 10 situation about moving, electron beam magnetic field correction coil 101,102 is produced when picture upside and downside deflection magnetic field M1, M2 and the power and the direction thereof that therefore electron beam are subjected to.
In Figure 11～Figure 13, the intensity of magnetic field M1, M2, for ease of understanding, with dashed lines and solid line are represented its strong and weak degree respectively, are divided into 2 grade standards.
Be positioned under the situation at center at the movable terminal T1 of 3 terminal variable resistances 20, deflection current no matter in arrow S1, S2 which side also all is that the electric current that flows through in the 1st, the 2nd magnetic field correction coil 101,102 equates to flowing.
So, produce laterally zygomorphic pincushion field M1, the M2 shown in Figure 11 (a), Figure 11 (b).
This magnetic field M1, M2 are added to the opposite force of directions X respectively on R, the B electron beam, these power, and intensity is identical, cancels each other, so the electron beam of R, B does not change on X-direction.
Therefore, do not carry out YH and intersect convergence errors and proofread and correct, the G electron beam of central authorities is applied power than the Y direction of R, B electronics beam intensity, convergence errors is corrected so VCR narrows down.
Then, when the movable terminal T1 that makes 3 terminal variable resistances 20 when arrow 16 directions of Figure 10 move, the electric current that flow in the 1st magnetic field correction coil 101 is littler than the electric current that flow in the 2nd magnetic field correction coil 102.
So, magnetic field in the case, the magnetic field M1 of the 1st magnetic field correction coil 101 sides dies down, and becomes the asymmetric pincushion field up and down shown in Figure 12 (a), Figure 12 (b).
And to the deflection of picture upside the time (referring to Figure 12 (a)), each electron beam is to the deflection of Y-axis positive direction, and the R electron beam is to positive direction (right of the figure) deflection of X-axis simultaneously, and the B electron beam is to the negative direction of X-axis (left of figure to) deflection.
And to the deflection of picture downside the time (referring to Figure 12 (b)), each electron beam is to the negative direction deflection of Y-axis, and simultaneously, the R electron beam is to the negative direction deflection of X-axis; The B electron beam is to the positive direction deflection of X-axis.
So, utilize these deflections can proofread and correct the left-leaning convergence errors of the R (red) shown in Figure 14 (a).
But the electric currents that flow in the 1st magnetic field correction coil 101 reduce, so the problem that occurs is: above-mentioned pincushion field dies down, and produce the convergence errors that narrows down of the significant VCR shown in Figure 15 (a).
On the other hand, when the movable terminal T1 that makes 3 terminal variable resistances 20 when arrow 17 directions of Figure 10 move, the electric current that flow in the 2nd magnetic field correction coil 102 is littler than the electric current that flow into the 1st magnetic field correction coil 101.
So, magnetic field in the case, the magnetic field M2 of the 2nd magnetic field correction coil 102 sides dies down, and becomes the asymmetrical pincushion field up and down shown in Figure 13 (a), Figure 13 (b).
Then, when to the deflection of picture upside (referring to Figure 13 (a)), each electron beam is to the positive direction deflection of Y-axis, and the R electron beam is to the negative direction of X-axis (left of figure to) deflection simultaneously; The B electron beam is to positive direction (right of the figure) deflection of X-axis.
And when to the deflection of picture downside (referring to Figure 13 (b)), each electron beam is to the negative direction deflection of Y-axis, and the R electron beam is to the positive direction deflection of X-axis simultaneously; The B electron beam is to the negative direction deflection of X-axis.
So, utilize these deflection, can proofread and correct R (red) Right deviation shown in Figure 14 (b) and fall convergence errors.
But, because the electric currents that flow in the 2nd magnetic field correction coil 102 reduce, so, in the case, such problem also appears, and promptly above-mentioned pincushion field dies down, and produces the convergence errors that narrows down of the significant VCR shown in Figure 15 (a).
Comprise the broaden VCR convergence errors of convergence errors of the VCR that narrows down this VCR the G (green) shown in convergence errors and Figure 15 (b) is offset laterally with respect to R (red) and B (orchid), its side-play amount wishes to be controlled at as far as possible in the native 0.030mm on picture top.
As mentioned above, in existing circuit shown in Figure 10, by moving the movable terminal T1 of 3 terminal variable resistances 20, can proofread and correct YH intersection convergence errors, simultaneously, the electric current that flow in magnetic field correction coil 101 or the magnetic field correction coil 102 reduces, the pincushion field dies down, so the problem that occurs is: VCR convergence errors correcting value reduces, its result, the VCR that the takes place convergence errors that narrows down is very big, considerably beyond native 0.030mm.
Therefore, problem to be solved by this invention is: provide the VCR convergence errors that narrows down does not take place, can school YH intersect the deflecting coil of convergence errors.
In order to address the above problem, the present invention has following structure as the method for dealing with problems.That is:
The deflecting coil of technical scheme 1 has cylindric footpath portion (51c) and a pair of frame deflector coil (12,13), it is characterized in that having:
The the 1st and the 2nd iron core (14A, 14B) is arranged to the above-mentioned neck of clamping, and state opposite one another; And
Convergence correction circuit (15A, 15B, 15C) is connected with above-mentioned frame deflector coil,
Above-mentioned convergence correction circuit has:
The the 1st～the 4th magnetic field correction coil (1～4); And
3 terminal variable resistances (20), it has 2 fixed terminals (T2, T3) and 1 movable terminal (T1),
Above-mentioned the 1st magnetic field correction coil (1) and above-mentioned the 2nd magnetic field correction coil (2) are connected in series mutually, form the 1st series circuit,
Above-mentioned the 3rd magnetic field correction coil (3) and above-mentioned the 4th magnetic field correction coil (4) are connected in series with above-mentioned 2 fixed terminals (T2, T3) respectively, form the 2nd series circuit,
Above-mentioned the 1st series circuit and above-mentioned frame deflector coil (12,13) are connected in series, above-mentioned the 1st series circuit and above-mentioned the 2nd series circuit, and parallel connection connects, and above-mentioned the 1st magnetic field correction coil (1) is connected with above-mentioned the 4th magnetic field correction coil (4),
Above-mentioned movable terminal (T1) is connected on the tie point (P) of above-mentioned the 1st magnetic field correction coil (1) and above-mentioned the 2nd magnetic field correction coil (2),
The the above-mentioned the 1st and the 3rd magnetic field correction coil (1,3) is wound on the 1st iron core (14A).
The the above-mentioned the 2nd and the 4th magnetic field correction coil (2,4) is wound on the 2nd iron core (14B).
Description of drawings
Fig. 1 is the circuit diagram of circuit in the execution mode of expression deflecting coil of the present invention.
Fig. 2 is the circuit diagram of circuit in another execution mode of expression deflecting coil of the present invention.
Fig. 3 is the circuit diagram of circuit in another execution mode of expression deflecting coil of the present invention.
Fig. 4 be the expression deflecting coil of the present invention execution mode in schematic perspective views.
Fig. 5 be the expression deflecting coil of the present invention another execution mode in schematic perspective views.
Fig. 6 is the curve chart of the relation of the turn(s) ratio in the execution mode of expression deflecting coil of the present invention and the variation of correcting value.
Fig. 7 be in the execution mode of expression deflecting coil of the present invention movable terminal at the summary sectional drawing of the effect of the 1st position.
Fig. 8 be in the execution mode of expression deflecting coil of the present invention movable terminal at the summary sectional drawing of the effect of the 2nd position.
Fig. 9 be in the execution mode of expression deflecting coil of the present invention movable terminal at the summary sectional drawing of the effect of the 3rd position.
Figure 10 is a circuit diagram of representing one of the circuit example of deflecting coil in the past.
Figure 11 is the summary sectional drawing of the effect in the deflecting coil of representing in the past.
Figure 12 is the summary sectional drawing of the effect in the deflecting coil of representing in the past.
Figure 13 is the summary sectional drawing of the effect in the deflecting coil of representing in the past.
Figure 14 is the figure of explanation YH intersection convergence errors.
Figure 15 is the figure of explanation VCR convergence errors.
Figure 16 is the schematic perspective views of one of expression deflecting coil in the past example.
Embodiment
Followingly utilize Fig. 1～9, Figure 14 and Figure 15, describe embodiments of the present invention in detail according to preferred forms.
Fig. 1 is the circuit diagram of circuit of the execution mode of expression deflecting coil of the present invention.
Fig. 2 is the circuit diagram of circuit of another execution mode of expression deflecting coil of the present invention.
Fig. 3 is the circuit diagram of circuit of another execution mode of expression deflecting coil of the present invention.
Fig. 4 is the schematic perspective views of the execution mode of expression deflecting coil of the present invention.
Fig. 5 is the circuit diagram of circuit of another execution mode of expression deflecting coil of the present invention.
Fig. 6 is the curve chart of the relation of the winding ratio in the execution mode of expression deflecting coil of the present invention and the variation of correcting value.
Fig. 7 is that movable terminal in the execution mode of expression deflecting coil of the present invention is at the summary sectional drawing of the effect of the 1st position.
Fig. 8 is that movable terminal in the execution mode of expression deflecting coil of the present invention is at the summary sectional drawing of the effect of the 2nd position.
Fig. 9 is that movable terminal in the execution mode of expression deflecting coil of the present invention is at the summary sectional drawing of the effect of the 3rd position.
Figure 14 is the figure of explanation YH intersection convergence errors.
Figure 15 is the figure of explanation VCR convergence errors.
At first, utilize Fig. 1, describe the circuit in the embodiments of the present invention in detail.
A pair of frame deflector coil 12,13 and correcting circuit 15A are connected in series in the output of vertical deflection circuit 56.
The structure of this correcting circuit 15A is: the 1st magnetic field correction coil 1 that is connected in series and the 2nd magnetic field correction coil 2 and fixed terminal T2, the T3 of the 4th magnetic field correction coil 4, the 3 terminal variable resistances 20 that are connected in series and the 3rd magnetic field correction coil 3, parallel circuits as connecting the 1st magnetic field correction coil 1 and the 4th magnetic field correction coil 4 is connected to the movable terminal T1 of 3 terminal variable resistances 20 on the tie point P of the 1st, the 2nd magnetic field correction coil 1,2 by resistor 11.
In this Fig. 1, the arrow S1 with solid line represents to the direction that makes the vertical yoke current of electron beam under the situation of picture upside deflection; And the arrow S2 of the direction with dashed lines of the vertical yoke current under the situation of subtend picture downside deflection represents.
Below utilize Fig. 4, describe the summary of the deflecting coil of the present invention that this correcting circuit 15A has been installed in detail.
In Fig. 4, deflecting coil for example makes up by a pair of semi-round ring shape is separated skeleton 51, forms funnel-form roughly, and the one head is a big footpath side, and the other end is the path side, has ring flange 51a, 51b on two respectively.
Shape of a saddle horizontal deflection coil (not shown) is installed on the inboard of separating skeleton 51; Saddle-shaped frame deflector coil 12,13 (not shown) is installed on the outside.
The outside at frame deflector coil 12,13, the iron core that installation is formed by ferrite (not shown), moreover, on its outside, on the substrate hold-down arm 51d that separates skeleton 51, the circuit substrate 53 that frame deflector coil 56,3 terminal variable resistances 20 and resistor 11 are housed on it has been installed.
And, separate skeleton 51 and constitute by sex change polyphenylene oxide (sex change PPE), polypropylene thermoplastic resins such as (PP) usually.
On the middle body of the ring flange 51b of path side, form a kind of cylindric neck 51c that constitutes by a plurality of tongue pieces and make it and ring flange 51b forms an integral body, outwards outstanding on tubular axis (Z axle) direction of not shown CRT54.
This deflecting coil is called saddle, saddle (SS) molded lines, and its summary structure as mentioned above.
And, fastening by using the strap (not shown) that is entrenched on the neck 51c to carry out, deflecting coil is installed on the neck of CRT54.
Below describe near the details of neck 51c in detail.
At the near surface of neck 51c one side of path side flange dish 51b, pair of core 14A, 14B are installed, and make on its above-below direction (Y direction) opposite one another, and neck 51c is clipped in therebetween at deflecting coil.The erecting device (not shown) that is equipped with on the ring flange 51b is adopted in this installation, but also can adopt other devices to install.
This iron core 14A, 14B form the U word shape, and its a pair of 14Ac of foot, 14Bc extend to the rectilinear direction of matrix part from the two ends of matrix part 14Ab, 14Bb, and it utilizes the silicon steel sheet stamping parts of thickness 0.5mm to form.
Twine the 1st magnetic field correction coil 1 on the matrix part 14Ab of a 14Ab unshakable in one's determination, its top is twined the 3rd magnetic field correction coil 3 again.
On the matrix part 14Bb of another 14B unshakable in one's determination, twine the 2nd magnetic field correction coil 2, its top is twined the 4th magnetic field correction coil 4 again.
The 1st magnetic field correction coil 1 and the 3rd magnetic field correction coil 3 are wound in the equidirectional magnetic field of mutual generation, and same, the 2nd magnetic field correction coil and the 4th magnetic field correction coil are wound in the equidirectional magnetic field of mutual generation.
The order of twining on 14A unshakable in one's determination, 14B also can be twined the 3rd, the 4th magnetic field correction coil 3,4 earlier.And, also can twine the 1st, the 3rd magnetic field correction coil 1,3 simultaneously, same, also can twine the 2nd, the 4th magnetic field correction coil 2,4 simultaneously.
The terminal lead-out wire of each coil is connected on the circuit of circuit substrate 53 by terminal 55.
Below utilize Fig. 1 and Fig. 7～Fig. 9, describe the effect of the correcting circuit 15A in this formation in detail.
Fig. 7 is from shielding the summary sectional drawing that a side is watched, and the position of watching is the position of having arranged 14A unshakable in one's determination, 14B under the state of the neck that the deflecting coil of execution mode is installed to CRT54, and Fig. 7 (a)～Fig. 9 (a) represents when the deflection of picture upside; Fig. 7 (b)～Fig. 9 (b) represents when the deflection of picture downside.
Fig. 7 (a) and Fig. 7) (b) expression, 20 movable terminal T1 are positioned under the situation at center at 3 terminal variable resistances, electron beam the 1st～the 4th magnetic field correction coil 1～4 is produced when picture upside and downside deflection magnetic field M1, M2 and therefore make power that electron beam bears with and direction.
Fig. 8 (a) and Fig. 8 (b) expression, under the movable terminal T1 that makes 3 terminal variable resistances 20 situation that therefrom the last direction (arrow 16) among mind-set Fig. 1 moves, electron beam the 1st～the 4th magnetic field correction coil 1～4 is produced when picture upside and downside deflection magnetic field M1, M2 and the power and the direction thereof that therefore electron beam are born.
Fig. 9 (a) and Fig. 9 (b) expression, under the movable terminal T1 that makes 3 terminal variable resistances 20 situation that therefrom the following direction (arrow 17) among mind-set Fig. 1 moves, the electron beam magnetic field that the 1st～the 4th magnetic field correction coil 1～4 is produced when picture upside and downside deflection and the power and the direction thereof that therefore electron beam are born.
In Fig. 7～Fig. 9, the intensity of magnetic field M1, M2 for the ease of understanding, is divided into weak, standard, this 3 ranks by force, and with dashed lines, solid line, thick line are represented respectively.
Be positioned under the situation at center at the movable terminal T1 of 3 terminal variable resistances 20, no matter deflection current is that direction in arrow S1, S2 flows, and also all is that the electric current that flow in the 1st, the 2nd magnetic field correction coil 1,2 equates.
So, produce laterally zygomorphic pincushion field M1, M2 shown in Fig. 7 (a), Fig. 7 (b).
This magnetic field M1, M2, for example shown in Fig. 7 (a) to the deflection of picture upside the time, magnetic field M1 applies the power of the negative direction of X-axis to the R electron beam, magnetic field M2 applies the power of positive direction.Magnetic field M1 applies the power of the positive direction of X-axis to the B electron beam, and magnetic field M2 applies the power of negative direction.
Then, be applied to the power of these X-directions on each electron beam, intensity is identical, cancels each other, so R, B electron beam no change on X-direction.
Positive negative direction is opposite when the deflection of picture downside, acts on identical.
Therefore, YH is intersected convergence errors do not proofread and correct, but the G electron beam of central authorities is applied power than the Y direction of R, B electronics beam intensity, so, the VCR convergence errors that narrows down is proofreaied and correct.
Then, when the movable terminal T1 that makes 3 terminal variable resistances 20 when the direction (the last direction of figure) of the arrow 16 of Fig. 1 is mobile, flow into electric current in the 1st magnetic field correction coil 1 less than the electric current that flow in the 2nd magnetic field correction coil 2.The electric current of the part that this reduces flow in the 4th magnetic field correction coil 4.
So magnetic field M1, M2 in the case becomes up and down asymmetric pincushion field, shown in Fig. 8 (a), Fig. 8 (b), the magnetic field M1 of the 1st magnetic field correction coil 1 side a little less than; The magnetic field M2 of the 2nd magnetic field correction coil 2 sides is stronger.Total pincushion field intensity does not change, and the narrow down calibration result of convergence errors of VCR does not reduce.
Then, when the deflection of picture downside (referring to Fig. 8 (a)), each electron beam is to the positive direction deflection of Y-axis, and simultaneously, the R electron beam is to positive direction (right among the figure) deflection of X-axis; The B electron beam is to the negative direction of X-axis (left among the figure to) deflection.
Moreover when to the deflection of picture downside (referring to Fig. 8 (b)), each electron beam is to the negative direction deflection of Y-axis, and simultaneously, the R electron beam is to the negative direction deflection of X-axis, and the B electron beam is to the positive direction deflection of X-axis.
So, utilize these deflection, can proofread and correct the R (red) shown in Figure 14 (a) and topple over convergence errors left.
On the other hand, when the movable terminal T11 that makes 3 terminal variable resistances 20 when arrow 17 directions (the following direction of figure) of Fig. 1 are mobile, flow into electric current in the 2nd magnetic field correction coil 2 less than the electric current that flow in the 1st magnetic field correction coil 1.The electric current of the part that this reduces flow in the 3rd magnetic field correction coil 3.
So, in the case magnetic field M1, M2, the magnetic field M2 of the 2nd magnetic field correction coil 2 sides a little less than; The magnetic field M1 of the 1st magnetic field correction coil 1 side is stronger, shown in Fig. 9 (a), Fig. 9 (b), forms asymmetrical pincushion field up and down.But the intensity of total pincushion field does not change, and the narrow down calibration result of convergence errors of VCR can not reduce.
And when to the deflection of picture upside (referring to Fig. 9 (a)), each electron beam is to the positive direction deflection of Y-axis, and the B electron beam is to the negative direction of X-axis (left of figure to) deflection simultaneously; The B electron beam is to positive direction (right of the figure) deflection of X-axis.
And when to the deflection of picture downside, (referring to Fig. 9 (b)), each electron beam are to the negative direction deflection of Y-axis, and simultaneously, the R electron beam is to the positive direction deflection of X-axis; The B electron beam is to the negative direction deflection of X-axis.
So, utilize these deflection, can proofread and correct the R (red) shown in Figure 14 (b) and topple over convergence errors to the right.
As mentioned above,, intersect convergence errors, also can not produce the new VCR convergence errors that narrows down even then adjust YH if adopt the present invention.
But correcting circuit is not limited only to above-mentioned correcting circuit 15A, for example also can adopt another kind of correcting circuit 15B shown in Figure 2.
This correcting circuit 15B is to above-mentioned correcting circuit 15A, removes resistor 11, and resistor 5,6 is connected in series to respectively on the 4th, the 3rd magnetic field correction coil 4,3.
And, also can use another correcting circuit 15C shown in Figure 3.
This correcting circuit 15C is to above-mentioned correcting circuit 15A, and resistor 5,6 is connected in series to respectively on the 4th, the 3rd magnetic field correction coil 4,3.
These correcting circuits 15B, 15C, under the situation of resistance value less than the resistance value of the 1st, the 2nd magnetic field correction coil 1,2 of the 3rd, the 4th magnetic field correction coil 3,4, the excess current that flow in the 3rd, the 4th magnetic field correction coil 3,4 is optimized, so be effective structure.More than in Shuo Ming correcting circuit 15A～15C, the correcting circuit 15A that the number of resistors of use is few, price is minimum, is preferred construction.
In the structure of above explanation, as can be seen: when the ratio of the number of turn of the 1st, the 2nd magnetic field correction coil 1,2 and the 3rd, the 4th magnetic field correction coil 3,4 changed, YH intersected the correcting value of VCR convergence errors of convergence errors timing and changes.
Specifically, as can be seen: when the turn ratio that makes the 3rd, the 4th magnetic field correction coil 3,4 is less than the number of turn of the 1st, the 2nd magnetic field correction coil 1,2, calibration result weakens, become the convergence errors that narrows down of the VCR shown in Figure 15 (a), when this turn ratio is increased, calibration result strengthens, and becomes the convergence errors that broadens of the VCR shown in Figure 15 (b).
Therefore, the inventor is the result of research experiment with keen determination further, find: the turn ratio RT2 of the turn ratio RT1 of 3 pairs the 1st magnetic field correction coils 1 of the 3rd magnetic field correction coil and 4 pairs the 2nd magnetic field correction coils 4 of the 4th magnetic field correction coil, all be set in more than 0.5 and 1.5 following scopes in, like this, can fully control the variation of the VCR convergence errors correcting value of YH intersection convergence errors timing, not produce new VCR convergence errors, can proofread and correct YH intersection convergence errors well.
Fig. 6 represents that the correcting value of VCR convergence errors changes and the relation of turn ratio RT1, RT2.In the figure, abscissa is turn ratio RT1, RT2, and ordinate is the variation of VCR convergence errors correcting value.
Correcting circuit for experiment usefulness is correcting circuit 14A shown in Figure 1, and each part Coefficient is as follows.
3 terminal variable resistance 20:20 Ω
Resistor 11:2.7 Ω
1st, the 2nd magnetic field correction coil 1,2: line footpath 0.30mm
3rd, the 4th magnetic field correction coil 3,4: line footpath 0.30mm
Experiment is in correcting circuit 14A, the number of turn of the 1st, the 2nd magnetic field correction coil 1,2 is fixed as 65 circles, under the situation of this same number of turn, the number of turn of the 3rd, the 4th magnetic field correction coil 3,4 is carried out various variations, be 120,100,80,65,55,45,35,25,15,5 circles, respectively VCR convergence errors correcting value measured.
Its result is as can be seen: as shown in Figure 6, along with the raising of turn ratio, the VCR convergence errors increases along straight line to positive side (wide side) substantially from minus side (narrow side).
And, as mentioned above, during VCR convergence errors on picture is proofreaied and correct, as can be seen: for the variable quantity scope-0.030 that obtains really to wish～+ 0.030mm, turn ratio RT1, RT2 are set at 0.5 or more and below 1.5 get final product.
Embodiments of the present invention are not limited only to said structure.
For example, the structure of above-mentioned execution mode is: the 1st magnetic field correction coil 1 and the 3rd magnetic field correction coil 3 are wrapped on the 14A unshakable in one's determination; The 2nd magnetic field correction coil 2 and the 4th magnetic field correction coil 4 are wrapped on the 14B unshakable in one's determination, but also can be wrapped in each magnetic field correction coil on the iron core independently respectively.
Specifically, as shown in Figure 5, the the 1st～the 4th magnetic field correction coil 1～4 is wrapped in respectively on 14A1 unshakable in one's determination, 14B1,14A2, the 14B2,14A1 unshakable in one's determination and 14A2 unshakable in one's determination and 14B1 unshakable in one's determination and 14B2 unshakable in one's determination are arranged in respectively on the Z-direction abreast, simultaneously 14A1 unshakable in one's determination and 14B1 unshakable in one's determination and 14A2 unshakable in one's determination with 14B2 unshakable in one's determination is arranged in the both sides of neck 51c and make it opposite one another.And the order that 14A1 unshakable in one's determination, 14A2 or 14B1 unshakable in one's determination, 14B2 are arranged side by side is not limited to this.
In the embodiment described above, in correcting circuit 15A, when the resistance value of resistor 11 reduced, the electric current that flow in the 3rd, the 4th magnetic field correction coil 3,4 increased, and YH intersection convergence errors correcting value increases; When resistance value increased, the electric currents that flow in the 3rd, the 4th magnetic field correction coil 3,4 reduced, and YH intersects the convergence errors correcting value that narrows down to be reduced.
So, by adjusting the resistance value of resistor 11, can change YH intersection convergence errors correcting value, under the situation of any correcting value of needs, also can change resistor 11 into potentiometer.
On the other hand, in correcting circuit 15B or 15C, if resistor 5,6 or resistor 5,6,11, resistance less, the electric currents that then flow in the 3rd, the 4th magnetic field correction coil 3,4 increase, YH intersects the convergence errors correcting value and increases; If resistance is bigger, the electric current that then flow in the 3rd, the 4th magnetic field correction coil 3,4 reduces, and YH intersection convergence errors correcting value reduces.
So, by adjusting the resistance of resistor 5,6 or 5,6,11, can change YH intersection convergence errors correcting value, under the situation of any correcting value of needs, also can change resistor 5,6 or 5,6,11 into potentiometer.
Deflecting coil is not limited to the SS type, also can be the deflecting coil of saddle, annular (ST) type.Separating skeleton 51 is not a pair of semicircular yet, but forms an integral body; In addition, also can constitute path side flange dish 51b and neck 51c separately.
And,, also can in the scope that does not break away from essential condition of the present invention, change even beyond these examples.The effect of invention
As mentioned above,, can obtain not produce the VCR convergence errors that narrows down, can proofread and correct YH and intersect the effect of convergence errors if adopt the present invention.
Claims (4)
1. deflecting coil, it has cylindric footpath portion and a pair of frame deflector coil, it is characterized in that having:
The the 1st and the 2nd iron core is arranged to the above-mentioned neck of clamping, and state opposite one another; And
Convergence correction circuit is connected with above-mentioned frame deflector coil,
Above-mentioned convergence correction circuit has:
The the 1st～the 4th magnetic field correction coil; And
3 terminal variable resistances, it has 2 fixed terminals and 1 movable terminal,
Above-mentioned the 1st magnetic field correction coil and above-mentioned the 2nd magnetic field correction coil are connected in series, and form the 1st series circuit,
Above-mentioned the 3rd magnetic field correction coil and above-mentioned the 4th magnetic field correction coil are connected in series with above-mentioned 2 fixed terminals respectively, form the 2nd series circuit,
Above-mentioned the 1st series circuit and above-mentioned frame deflector coil are connected in series, and above-mentioned the 1st series circuit and above-mentioned the 2nd series circuit are connected in parallel, so that above-mentioned the 1st magnetic field correction coil is connected with above-mentioned the 4th magnetic field correction coil,
Above-mentioned movable terminal is connected on the tie point of above-mentioned the 1st magnetic field correction coil and above-mentioned the 2nd magnetic field correction coil,
The the above-mentioned the 1st and the 3rd magnetic field correction coil is wound on the 1st iron core.
The the above-mentioned the 2nd and the 4th magnetic field correction coil is wound on the 2nd iron core.
2. deflecting coil as claimed in claim 1 is characterized in that: above-mentioned convergence correction circuit has the 1st fixed resistor that is connected between above-mentioned movable terminal and the above-mentioned tie point.
3. deflecting coil as claimed in claim 1 or 2 is characterized in that: above-mentioned convergence correction circuit has the 2nd fixed resistor that is connected in series respectively with the above-mentioned the 3rd and the 4th magnetic field correction coil.
4. as each the described deflecting coil in the claim 1 to 3, it is characterized in that: the above-mentioned ratio and the number of turn of above-mentioned the 4th magnetic field correction coil to above-mentioned the 1st magnetic field correction coil turn of the number of turn of above-mentioned the 3rd magnetic field correction coil is more than 0.5 the ratio of the number of turn of above-mentioned the 2nd magnetic field correction coil, and below 1.5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002190226A JP3849592B2 (en) | 2002-06-28 | 2002-06-28 | Deflection yoke |
| JP190226/2002 | 2002-06-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1469418A true CN1469418A (en) | 2004-01-21 |
| CN1251287C CN1251287C (en) | 2006-04-12 |
Family
ID=29996876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031425437A Expired - Fee Related CN1251287C (en) | 2002-06-28 | 2003-06-17 | Deflecting coil |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3849592B2 (en) |
| KR (1) | KR100513913B1 (en) |
| CN (1) | CN1251287C (en) |
| TW (1) | TWI282109B (en) |
-
2002
- 2002-06-28 JP JP2002190226A patent/JP3849592B2/en not_active Expired - Fee Related
-
2003
- 2003-03-28 TW TW092107160A patent/TWI282109B/en not_active IP Right Cessation
- 2003-04-18 KR KR10-2003-0024593A patent/KR100513913B1/en not_active IP Right Cessation
- 2003-06-17 CN CNB031425437A patent/CN1251287C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004040158A (en) | 2004-02-05 |
| KR100513913B1 (en) | 2005-09-13 |
| KR20040002496A (en) | 2004-01-07 |
| TW200400529A (en) | 2004-01-01 |
| JP3849592B2 (en) | 2006-11-22 |
| CN1251287C (en) | 2006-04-12 |
| TWI282109B (en) | 2007-06-01 |
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