CN1251285C - Asymmetric shunting device for deflection system for reducing symmetric defects between diagonals - Google Patents
Asymmetric shunting device for deflection system for reducing symmetric defects between diagonals Download PDFInfo
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- CN1251285C CN1251285C CN 00120001 CN00120001A CN1251285C CN 1251285 C CN1251285 C CN 1251285C CN 00120001 CN00120001 CN 00120001 CN 00120001 A CN00120001 A CN 00120001A CN 1251285 C CN1251285 C CN 1251285C
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- coil
- saddle
- pair
- conductor assembly
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Abstract
A deflection system for cathode ray tubes is provided with at least one pair of saddle-shaped deflection coils (4) which form an asymmetric front part conductor component (25). The asymmetry is caused by grooves or pits (40, 42) positioned on the inner sides or the outer sides of conductor bundles forming the conductor component or is caused by contents near front part conductor components of at least one metal plate. The aim of the asymmetry is to minimize the influence of orthogonal defects between deflection fields produced by the horizontal deflection coil and the vertical deflection coil on the geometric shape of an image.
Description
Technical field
The present invention relates to be used for the deflection unit of color cathode ray tube, this unit also is called as deflection system, the a pair of horizontal deflection coil and a pair of frame deflector coil that comprise saddle type, the special shape of coil can make broom shape, geometry and the convergence errors of electron beam minimize simultaneously.
Background technology
The cathode ray tube that produces chromatic image generally comprises the electron gun of emission three-beam coplanar electron-beam, the fluorescent material that is used for specific primary colours (red, green or blue) on the phosphor screen of every beam electrons Shu Jili cathode ray tube.
Owing to be fixed in the effect of the level of deflection system and the deflection field that frame deflector coil produces of pipe neck, the phosphor screen of electron beam scanning pipe.The separator that is made of plastics is used to isolate two pairs of coils and guarantees that deflection system is a mechanical rigid.The ferromagnetic material ring is usually around deflecting coil, so that deflection field is concentrated in the suitable zone.
The three electron-beam that is produced by electron gun must always be focused on the phosphor screen of pipe, and introduces so-called convergence errors, and particularly, this will make colored reproduction make mistakes.Assemble the so-called auto-convergence astigmatism of known use deflection field in order to make three complanar electron beams; In automatic converged deflecting coil, the field intensity that produces by horizontal deflection coil or the magnetic line of force be arranged in the face of the coil on fluoroscopic pipe one side generally be pincushion than a part of coil of front.This is equivalent to introduce high positive 3 subharmonic of the ampere-turn density of coil front portion in the distribution of the number of turn that constitutes the straight line coil.
And because the effect of even level and vertical deflection magnetic field is a pyramid by the volume of electron beam scanning, its summit overlaps with the deflection center of deflection system, and it and surperficial intersecting of non-spherical phosphor screen are rendered as the geometrical defect that is called as pincushion distortion.The fluoroscopic radius of curvature of pipe is big more, and the geometric distortion of image is big more.The auto-convergence deflection system produces the astigmatism deflection field, thereby can revise the north/Nan Hedong/western geometry of image, particularly, and partly compensation north/southern pincushion distortion.
The design of deflection system also should be considered coma aberration, and coma aberration is the distortion of influence from the side electron beam of the electron gun emission of emission three-beam electron-beam in line, and is irrelevant with the curvature on deflection field astigmatism and tube fluorescent screen surface; These side electron beams with respect to pipe the axle low-angle enter deflection system, except electron beams, all the other electron beams are deflected.Generally proofread and correct coma aberration, thereby compensation is by the coma aberration for obtaining to realize that field distribution that the desirable astigmatism of auto-convergence needs produces by revising the distribution of deflection field that enters the point of deflection system at electron beam.Therefore, for horizontal deflecting field, be barrel-shaped in the field at deflection system rear portion, fore is pincushion.
In addition, two pairs of deflecting coils are that level must produce the vertical deflection field of mutual strictness with frame deflector coil.If a field can take place with respect to another modulated phenomenon in two field out of plumb.Because the amplitude of horizontal deflection coil control signal is about 900 volts, and carries about 50 volts to frame deflector coil, frame deflector coil is used as the secondary coil of transformer, and the primary coil of transformer should be a horizontal deflection coil.This mudulation effect also is called as cross modulation, and is determined by formula XMod=100 * Vv/Vh usually, and wherein Vv is the voltage of when carrying voltage Vh for horizontal deflecting coil frame deflector coil being measured.Crossover modulation causes the geometrical issues by the image on the tube fluorescent screen of the scanning generation of electron beam.These problems for example are orthogonality and parallelogram defective.The alignment requirements of these defectives is considered these defectives when the design deflection system, but the technology of considering these defectives is very difficult, or impossible, because when finishing the design phase, defect source is in the manufacturing issue that produces in the phase I of making deflection system; Therefore need be by when designing deflecting coil, increasing new step or using the electronic control circuit that can be used for the image geometry correction to solve these problems.The present invention by revising the pair of saddle-shaped coil anterior conductor assembly and in described conductor assembly, introduce asymmetrical shape the simple scheme that addresses these problems be provided.The shape that is arranged in the coil forming device of the mould front portion that prevents winding by modification is incorporated into manufacturing with this modification, and this modification is to the convergence or the not influence of coma aberration of other definite when designing coil parameter such as three-beam electron-beam.
Summary of the invention
For this reason, the deflection system that is used for color cathode ray tube according to the present invention comprises a pair of horizontal deflection coil, a pair of frame deflector coil, these coils will produce the magnetic deflection field perpendicular to main shaft Z, at least one pair of is made of saddle coil in these two pairs of coils, the lead of each of described saddle coil is set to and forms anterior conductor assembly and rear portion conductor assembly, these two conductor assemblies are electrically connected mutually by two horizontal conductor bundles, these parts and the transverse beam that form each described saddle coil of rear portion conductor assembly are used to plane symmetry setting that described pair of saddle-shaped coil is separated with respect to one, described deflection system is characterised in that: it has one first metallic plate, be arranged near one the anterior conductor assembly in the described pair of saddle-shaped coil, be used for direction or the amplitude of local modification by the magnetic field of the electric current generation of flowing through at described conductor assembly, thereby by the field H that described anterior conductor assembly produced, H ' is for asymmetric with respect to the plane that described pair of saddle-shaped coil is separated, and one second metallic plate is arranged in the described pair of saddle-shaped coil near another the anterior conductor assembly, and first and second metallic plates are with respect to the symmetrical extension of this main shaft Z.
In the plane perpendicular to main shaft Z, described first and second metallic plates are to be positioned with average radial angle between plane that described pair of saddle-shaped coil is separated becomes 60 ° and 90 °.
By following explanatory note and accompanying drawing the easier quilt of the present invention is understood, wherein:
Description of drawings
Fig. 1 represents to be assembled to the cutaway view according to deflection system of the present invention of cathode ray tube neck;
Fig. 2 A and 2B represent from the front and above the saddle coil seen according to the prior art state;
Fig. 3 A-3C represents quadrature and the parallelogram defective that the present invention solves;
Fig. 4 represents one embodiment of the present of invention;
Fig. 5 represents the influence of the shape of coil of the present invention to the field of the front portion of described coil; With
Fig. 6 represents the second embodiment of the present invention.
Fig. 7 represents another embodiment of the present invention and to the influence of the deflection field of coil front portion.
Embodiment
Fig. 1 represents to be arranged on the cutaway view of the deflection system of the present invention 1 on cathode ray tube 6 necks 8.This deflection system comprises: a pair of frame deflector coil 4, a pair of horizontal deflection coil 3, separator 2 mutual insulatings that these two pairs of coils usefulness generally are made of plastics and the ferromagnetic material ring 5 in concentrating coil 3 and 4 magnetic fields that produce.Electron beam 12 deflections that these produce electron gun 7 are so that the phosphor screen 9 of described electron beam scanning pipe 6.
Fig. 2 A and 2B represent that frame deflector coil 4 is the prior art state of saddle type.Each coil comprises and forms the rear portion conductor assembly 24 be positioned at Background Region 32, the conductor circuit that is positioned at the anterior conductor assembly 25 of front area 30 that these two conductor assemblies are connected to each other by the horizontal conductor bundle 26 at zone line 31.Under situation shown in Fig. 2 A and the 2B, the symmetrical plane P of each frame deflector coil is the XZ plane.
During making deflection system, the influence that the parameter of determining in the design phase may be subjected to industrial manufacturing process or be used to make the equipment of described deflection system.For example, cross modulation can produce quadrature and parallelogram defective.These defectives show on the phosphor screen of pipe in the following manner:
-under the quadrature defect situation, as shown in Figure 3A, the straight line 3 that is produced by green center electron beam on the phosphor screen 9 of the pipe with vertical axis Y does not overlap with described axle;
-under the parallelogram defect situation, shown in Fig. 3 B, 3C, be used to produce straight line 33,34 that the green beam of the horizontal edge 30 of image and vertical edge 35 produces not with described coincident.
The scheme that addresses these problems is to consider these defectives in new design procedure, and therefore utilizes the method for successive approximation to obtain the deflection system of its characteristic conforms index request.
The present invention aims to provide the straightforward procedure that addresses these problems and does not revise the design of deflection system and therefore do not revise electron-beam convergence or coma aberration parameter.For this reason, rear portion conductor assembly 24 and horizontal conductor bundle 26 are not changed and are symmetrical arranged with respect to plane P, under the frame deflector coil situation, and the planes overlapping that this plane and pipe main shaft Z and trunnion axis X determine; Revise anterior conductor assembly, so that make this conductor assembly asymmetric with respect to plane P, in the regional A of described conductor assembly, this asymmetry is depression or form of grooves, as shown in Figure 4.Fig. 5 is illustrated in the influence of the magnetic field H that the outside deep recess that forms 41 of conductor assembly and this asymmetry produce the electric current of the conductor that flows through described anterior conductor assembly 25.Magnetic field H is subjected to slightly rotating with respect to the direction that has when not having asymmetry, and the result is, particularly magnetic field H ' introduce component H '
yThis rotation that acts on the deflection system front portion only influences the geometry of the image that produces on the phosphor screen of pipe; Component H '
yCompensated the direction of horizontal deflecting field and perpendicular to the displacement between the direction of vertical deflection field, so that eliminate the influence of described displacement.
In another embodiment of the present invention, as shown in Figure 7, metallic plate 43 is placed near the anterior conductor assembly 25 of frame deflector coil.In this part of this coil, the plate 43 that forms magnetic shield can increase or reduce the intensity as the magnetic field of electron beam deflecting field, this depend on described metallic plate 43 be placed on above the anterior conductor assembly still be below.Fig. 7 represents that metallic plate 43 is positioned at below the anterior conductor assembly 25 of frame deflector coil.
Metallic plate 43 introduce the frame fields amplitude local correction and along the corresponding proportional correction of the amplitude of the field component of Y-axis.Compensated the direction of horizontal deflecting field and perpendicular to the displacement between the vertical deflection field direction, so that eliminate the influence of described displacement along the local correction of the field component of Y-axis.
Because the influence of horizontal deflection coil mainly is a crossmodulation problems, so be preferably in and introduce above-mentioned compensating effect in the frame deflector coil, do not get rid of the possibility of the anterior conductor assembly of revising the saddle type horizontal deflection coil in the same way, so that obtain the same effect of local correction of the direction of the field that produces by described coil.
As shown in Figure 4, this figure shows from the rear portion by a pair of frame deflector coil of the present invention, be positioned at depression 40 on the anterior conductor assembly 25 of frame deflector coil 4 on the sagittal plane at average angle θ with respect to the orientation measurement of the YZ parting surface of two frame deflector coils
mAround extend with angle of release Δ θ; Same parts put on the position of metallic plate 43 of local correction deflection field.Experiment shows, the average angle between selecting 45 ° and 90 ° by the average angle between frame deflector coil is selected 60 ° and 90 ° with to horizontal deflection coil can obtain optimum efficiency.
The cup depth 41 that forms on conductor assembly will change according to the cross modulation amplitude that will proofread and correct, and the angle of release Δ θ that extends with described depression is the same.In addition, on same conductor assembly, several depressions are set for the effect of modulating them or groove is favourable.Equally, in one or more somes local correction magnetic fields, can have one or more plates near the anterior conductor assembly of coil.
Because at right half screen and the electric current in the anterior conductor assembly 25 and 25 ' of left half screen is reciprocal, therefore the power that acts on electron beam must be in the other direction, so that proofread and correct the influence of cross modulation to image geometry, if between to two coils of coil, do not introducing extra correction, depression of the anterior conductor assembly of one of coil (one or more) or groove (one or more) and generally be provided with respect to the Z axial symmetry with depression (one or more) or groove (one or more) to the anterior conductor assembly of another coil of deflecting coil.Also be being used to revise under the situation of metallic plate 43 in magnetic field and also can doing as described above with respect to the setting of Z axial symmetry.
Depression or groove can be arranged on the outside of conductor assembly, as shown in Figure 5, perhaps are arranged on the inside of conductor assembly, and as shown in Figure 6, this depends on the local orientation of requirement to deflection field.
Major advantage of the present invention is easy enforcement. If correction is the shape of coil, can forwardly insert Enter wedge and revise simply the coil forming device, the shape of this wedge with will conductor assembly form recessed The form fit that falls into; Some east that therefore need not redefine new die and mainly cause very high extra cost The west. When by the amplitude of metallic plate local correction field, for example can be by they being bonded to the deflection system branch On the plastic body of device and these plates are set; This scheme implementation gets up very simple, and has avoided the modification coil Itself.
Claims (3)
1, is used for the deflection system of color cathode ray tube, comprises
A pair of horizontal deflection coil (3),
A pair of frame deflector coil (4), these coils will produce the magnetic deflection field perpendicular to main shaft Z,
At least one pair of is made of saddle coil in these two pairs of coils,
The lead of each described saddle coil is set to and forms anterior conductor assembly (25) and rear portion conductor assembly (24), and these two conductor assemblies are connected to each other by horizontal conductor bundle (26),
Those parts and the horizontal conductor bundle that form each described saddle coil of rear portion conductor assembly are used to plane symmetry setting that described pair of saddle-shaped coil is separated with respect to one, it is characterized in that,
Deflection system has one first metallic plate (43), be arranged near one the anterior conductor assembly in the described pair of saddle-shaped coil, be used for direction or the amplitude of local correction by the magnetic field H that flows through the electric current generation at described conductor assembly, thereby by magnetic field H that described anterior conductor assembly produced and H ' for asymmetric with respect to the plane that described pair of saddle-shaped coil is separated and
One second metallic plate (43) is arranged in the described pair of saddle-shaped coil near another the anterior conductor assembly,
First and second metallic plates are with respect to the symmetrical extension of this main shaft Z.
According to the deflection system of claim 1, it is characterized in that 2, described a pair of frame deflector coil is made of two described saddle coils.
According to the deflection system of claim 2, it is characterized in that 3, in the plane perpendicular to main shaft Z, described first and second metallic plates are to be positioned with average radial angle between plane that described pair of saddle-shaped coil is separated becomes 60 ° and 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00120001 CN1251285C (en) | 2000-05-27 | 2000-05-27 | Asymmetric shunting device for deflection system for reducing symmetric defects between diagonals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00120001 CN1251285C (en) | 2000-05-27 | 2000-05-27 | Asymmetric shunting device for deflection system for reducing symmetric defects between diagonals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1326210A CN1326210A (en) | 2001-12-12 |
| CN1251285C true CN1251285C (en) | 2006-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00120001 Expired - Fee Related CN1251285C (en) | 2000-05-27 | 2000-05-27 | Asymmetric shunting device for deflection system for reducing symmetric defects between diagonals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1251285C (en) |
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2000
- 2000-05-27 CN CN 00120001 patent/CN1251285C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1326210A (en) | 2001-12-12 |
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Granted publication date: 20060412 Termination date: 20100527 |