CN1018408B - Color cathode tube with deflection optical aberration improved - Google Patents
Color cathode tube with deflection optical aberration improvedInfo
- Publication number
- CN1018408B CN1018408B CN90106746A CN90106746A CN1018408B CN 1018408 B CN1018408 B CN 1018408B CN 90106746 A CN90106746 A CN 90106746A CN 90106746 A CN90106746 A CN 90106746A CN 1018408 B CN1018408 B CN 1018408B
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- China
- Prior art keywords
- magnetic field
- permanent magnet
- electron
- pair
- electron beam
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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
- H01J29/703—Static convergence systems
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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
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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
- H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
- H01J29/566—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses for correcting aberration
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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
In a cathode ray tube, a first pair of permanent magnet pieces are arranged along a horizontal direction and fixed on an end portion of a deflection unit at an electron gun side in such a manner that poles of one of the magnet pieces face the other poles of the other magnet piece. A second pair of permanent magnet pieces are arranged along a vertical direction, separated from the first pair of permanent magnet pieces by being fixed on a neck portion, forward of the electron gun assembly, and in such a manner that poles of one of the, magnet pieces face the other poles of the other magnet piece.
Description
The present invention relates to improve the deflection aberration that magnetic deflection field produced that takes place by arrangement for deflecting, be thereby that the distortion of electron-beam point makes good chromoscope of focus characteristics and arrangement for deflecting thereof.
Generally, as shown in Figure 1, chromoscope has the shell of being made up of panel 1 and funnel 23, reaches the shadow mask that phosphor screen 5 therewith is oppositely arranged what the inner face of this panel 1 formed by sending phosphor screen 5 that indigo plant, tri-color phosphor layer green, ruddiness forms.The electron gun structure 7 of emission three electron-beam B, G, R is set in the neck 6 of funnel 2 again, and make three electron-beam B, G, the R of 7 emissions of electron gun structure from then at level and vertical direction upper deflecting by arrangement for deflecting 9, this arrangement for deflecting is contained in the outside of the boundary part of the tapering part 6 of funnel 2 and neck 8, and by scanning phosphor screen 5 on this phosphor screen 5 color display.
As shown in Figure 2, arrangement for deflecting 9 have make three electron-beam in the horizontal direction upper deflecting a pair of horizontal deflection coil 10 and make the frame deflector coil 11 of its deflection in vertical direction.
In chromoscope,, require on whole phosphor screen 5, can both correctly make electron beam B, G, R to assemble in order on phosphor screen 5, to show correct image.For this reason, generally adopt a row type chromoscope of auto-convergence mode.In this chromoscope, be specific non-homogeneous type magnetic field as electron gun structure, the magnetic deflection field that produces the characteristic of this row type electron gun structure and arrangement for deflecting 9 is formed generally by adopting a row type electron gun structure, and three electron-beam B, G, R can both be assembled on whole phosphor screen 5, an above-mentioned row type electron gun structure can be launched by a central electron beam G and an offside electron beam B, R three electron-beam B, G, R that form, that form a line at grade.About the non-homogeneous type magnetic deflection field that in a row type chromoscope of this auto-convergence mode, produces, generally make horizontal deflection magnetic field with the pincushion field, make vertical deflection magnetic field with barrel-shaped magnetic deflection field.By such magnetic field can make three electron-beam B, the G, the R that form a line on the same horizontal plane converge on the phosphor screen 5 a bit.
But even adopt such magnetic field, still there is following point in a row type chromoscope, and the coma aberration that the convergence because of central electron beam G and side electron beam B, R has skew to cause promptly can take place on the picture peripheral part.
For this coma aberration is carried out revisal, the technology that on the public clear 51-26208 of spy number and special public clear 54-23208 communique, discloses for configuration one with leak into the magnetic that the magnetic field on the electron gun structure combines from the arrangement for deflecting rear side, the technology that then discloses on real public clear 57-45748 communique is not for using above-mentioned magnetic again, but ancillary coil is set and makes the deflection current in the frame deflector coil of the electric current that wherein flows through and the arrangement for deflecting of flowing through synchronous by electron gun structure one side at arrangement for deflecting, and form strong pincushion field.
But the problem that exists in so existing chromoscope is that the point of the electron beam on the phosphor screen can the distortion with its deflection.Promptly as shown in Figure 3, the point 13 because of the electron beam that is subjected to the deflection of even type the action of a magnetic field all forms roughly positive circular on whole image 14.Yet as shown in Figure 4, the point 13 because of the electron beam that is subjected to the deflection of non-homogeneous type the action of a magnetic field becomes the laterally long ellipse of its major axis in horizontal axis in trunnion axis (X-axis) end of picture 14 because of distortion.Promptly shown in Fig. 5 A, under the effect of the horizontal deflection magnetic field 15 of pincushion, the first half of each electron beam B, G, R is subjected to pushing to Lorentz lorentz (Lorentz) power of below, and its latter half then is subjected to pushing to the Lorentz force of top, thereby the electron beam distortion.And for example shown in Fig. 5 B, end at the vertical axis (Y) of picture 14, by barrel-shaped vertical deflection magnetic field 16, the right half part of each electron beam B, G, R is subjected to pushing to right-hand Lorentz force, its left-half is subjected to pushing to the Lorentz force of left, and distortion is a major axis laterally long ellipse in the horizontal direction.Particularly, with regard to an offside electron beam B, R, the size of the power of bearing about electron beam is different, and because the direction of the power of being born on the electron beam R on the electron beam B in the left side of picture and right side is opposite, so at an offside electron beam B of vertical axis end, the bundle point of R, shown in 13B, 13R among Fig. 4, tilt to the direction of reporting to the leadship after accomplishing a task mutually.Consequently because this level or vertical deflection magnetic field 15,16 cause the distortion or the inclination of electron-beam point, the focus characteristics on the peripheral part of picture 14 significantly worsens.And the deterioration of this focus characteristics becomes and hinders electron gun structure to have high performance one big reason.
For this reason, for making the focusing on the peripheral part of picture 14 good, and have to when design, compromise, promptly sacrifice focusing, and pay attention to the consistency of the focusing of the core of picture 14 and peripheral part at picture 14 cores.
Again, about the ancillary coil of the public clear 57-45748 communique of above-mentioned reality, because the synchronous electric current of deflection current of the utilization and the frame deflector coil of flowing through, so there is following problem.Promptly when making electron beam at the vertical axis upper deflecting by occurring in the magnetic field of the horizontal direction on the trunnion axis, electron beam is in electron gun structure one side of arrangement for deflecting, deflecting action in vertical direction is excessive, be easy to bombard the inboard wall of tube neck of funnel, thereby on picture, can promptly can not arrive non-luminous part by the so-called pipe neck shadow of generation because of electron beam.Again and since the structure of this ancillary coil be with coil around to magnetic and electric current is flowed in its coil, so revisal element price is higher, and be difficult to make cost to reduce.Arrangement for deflecting uses the arrangement for deflecting that its impedance changes with the television set of each manufacturer more again, thereby along with the difference of its impedance, the electric current of the deflecting coil of flowing through is also different.Thereby for the effect that makes ancillary coil has adaptability with respect to such arrangement for deflecting, be necessary to contrast the impedance of deflecting coil and the specification that changes ancillary coil, thereby the property produced in batches is poor.
The object of the present invention is to provide a kind of chromoscope and arrangement for deflecting thereof, they can alleviate and result from the distortion of electron-beam point of magnetic deflection field of deflecting coil and be deflection aberration, prevent the deterioration of the focus characteristics on the picture peripheral part and have the good focusing characteristic on whole image.
The chromoscope that is provided in the present invention comprises:
Shell with tubular axis,
A row type electron gun structure of emission central electron beam and both sides electron beam in same plane,
Main make electron beam along the pincushion deflecting magntic field of the enterprising horizontal deflection of first direction on above-mentioned plane, and main simultaneously make electron beam with the deflection magnetic field generating device of the barrel-shaped magnetic deflection field of the enterprising horizontal deflection of second direction of first direction quadrature,
Deflection magnetic field generating device one side between deflection magnetic field generating device and electron gun structure also becomes configuration axisymmetrically and its pole reversal that first pair of permanent magnet spare in the first revisal magnetic field takes place relatively along first direction and with respect to the central shaft of deflection magnetic field generating device or tubular axis; And
Electron gun structure one side between deflection magnetic field generating device and electron gun structure and separate with first pair of permanent magnet spare and become configuration axisymmetrically along second direction and with respect to the central shaft or the tubular axis of deflection magnetic field generating device, its pole reversal are relatively and second pair of permanent magnet spare in the pincushion second revisal magnetic field take place.
The chromoscope that provides in the present invention comprises:
Shell with tubular axis,
A row type electron gun structure of emission central electron beam and both sides electron beam in same plane,
Main make electron beam along the pincushion deflecting magntic field of the enterprising horizontal deflection of first direction on above-mentioned plane, and main simultaneously make electron beam with the deflection magnetic field generating device of the barrel-shaped magnetic deflection field of the second direction upper deflecting of first direction quadrature,
Field generator for magnetic one side between deflection magnetic field generating device and electron gun structure and along first direction and second direction, with respect to the central shaft of deflection magnetic field generating device or tubular axis becomes configuration axisymmetrically and make the polarity of inequality that the first biconjugate permanent magnet spare in the first revisal magnetic field of pincushion take place relatively
Between deflection magnetic field generating device and electron gun structure, be positioned at electron gun structure one side and separate with the first biconjugate permanent magnet spare and along the either direction of first and second direction, with respect to the central shaft of deflection magnetic field generating device or tubular axis becomes axial symmetry to be configured and its polarity becomes with first pair of relative magnet iron piece oppositely and the 2nd pair of permanent magnet spare in the second revisal magnetic field of pincushion takes place.
Fig. 1 is the constructed profile of the existing chromoscope of expression,
Fig. 2 is contained in the perspective illustration of the arrangement for deflecting on the chromoscope of Fig. 1 for expression,
Fig. 3 is made the explanation plane graph of the shape of the bundle point on the phosphor screen that electron beam produced of its deflection by the arrangement for deflecting that uniform magnetic field takes place for expression,
Fig. 4 is made the explanation plane graph of the shape of the point on the phosphor screen that electron beam produced of its deflection by the arrangement for deflecting that non-uniform magnetic-field takes place for expression,
Fig. 5 A and Fig. 5 B are respectively in order to explanation pincushion horizontal deflection magnetic field and the barrel-shaped vertical deflection magnetic field key diagram to the influence of electron beam,
Fig. 6 is the schematic sectional view of the chromoscope of the first embodiment of the present invention,
Fig. 7 is contained in the arrangement for deflecting on the chromoscope of Fig. 6 for expression and is contained in the perspective view of two pairs of permanent magnets on this arrangement for deflecting,
Fig. 8 is the key diagram in order to the pincushion field that two pairs of permanent magnets generations shown in Figure 7 are described,
Fig. 9 is the key diagram in order to the pincushion field that pair of right and left permanent magnet generation shown in Figure 7 is described,
Figure 10 in order to illustrate shown in Figure 7 reach up and down about the key diagram of each formed pincushion field of pair of permanent magnets,
Figure 11 is in order to illustrating pincushion field that pair of permanent magnets up and down shown in Figure 7 the takes place key diagram to the effect of the point of electron beam,
Figure 12 is in order to illustrating pincushion field that pair of right and left permanent magnet shown in Figure 7 the takes place key diagram to the effect of the point of electron beam,
Figure 13 is the figure of expression shape of the point of the electron beam of the effect of permanent magnet when illustrating that two pairs of permanent magnet configuration are on same horizontal plane,
Figure 14 is in order to explanation beam diameter and the key diagram that concerns of the position of pair of permanent magnets up and down,
The key diagram of Figure 15 for concerning in order to the position that an offside electron beam and pair of right and left permanent magnet are described,
Figure 16 for expression in order to the figure of explanation by the shape of the point of the resulting electron beam in pincushion field of two pairs of permanent magnets generation of the present invention,
Figure 17 is the schematic sectional view of the chromoscope of expression second embodiment,
Figure 18 is the schematic sectional view of the chromoscope of the third embodiment of the present invention,
Figure 19 is contained in the arrangement for deflecting on the chromoscope of Figure 18 for expression and is contained in the perspective view of three pairs of permanent magnets on this arrangement for deflecting,
Figure 20 and Figure 21 be in order to illustrating pincushion field that the first biconjugate permanent magnet shown in Figure 180 the takes place key diagram to the effect of the point of electron beam,
Figure 22 represents to be contained in the arrangement for deflecting on the chromoscope of the fourth embodiment of the present invention and is contained in the perspective view of two pairs of permanent magnets on this arrangement for deflecting,
Figure 23 represents the figure in order to the shape of the point of the electron beam of the effect that permanent magnet shown in Figure 22 is described,
Figure 24 and Figure 25 are the of the present invention the 5th and the schematic sectional view of the chromoscope of the 6th embodiment.
Followingly according to embodiment chromoscope of the present invention is described with reference to accompanying drawing.
The figure of a row type chromoscope of expression auto-convergence mode on Fig. 6.This chromoscope has the shell of being made up of panel 1 and funnel 23, the phosphor screen 5 that forms at the inner face of panel 1 and the shadow mask that is formed with a plurality of electron beam through-holes of the inboard that is contained in this panel 14 relative and by send indigo plant, tri-color phosphor layer green, ruddiness is formed.Configuration is listed as a following row type electron gun structure 20 configuration, that penetrate three electron-beam B, G, R through the work on the same horizontal plane one in the neck 6 of funnel 2 again.Again, in the outside of the boundary part of the tapering part 8 of funnel 2 and neck 6 arrangement for deflecting is installed, this device makes three electron-beam B, the G, the R that penetrate from electron gun structure 20 carry out deflection in the horizontal and vertical directions and scan phosphor screen.
Arrangement for deflecting 9 is to make three electron-beam B, G, R converge at the arrangement for deflecting of the auto-convergence mode on the phosphor screen 5 with non-uniform magnetic-field, as shown in Figure 7, has a pair of horizontal deflection coil 23 and a pair of frame deflector coil 25.These horizontal deflection coil 23 coileds are the saddle type for example, and is contained in the inboard of isolator 22.This frame deflector coil 25 is around for example on unshakable in one's determination 24, and is contained in the outside of isolator 22.The a pair of horizontal deflection coil 23 of this arrangement for deflecting 9 is main, and to form the three electron-beam that makes from electron gun structure 20 emissions be the pincushion deflecting magntic field of X-direction upper deflecting in the horizontal direction, its a pair of frame deflector coil 25 is main form make three electron-beam with the vertical direction of its orientation quadrature, be the barrel-shaped magnetic deflection field of Y direction upper deflecting.Again, herein, so-called pincushion deflecting magntic field is that the barrel-shaped magnetic deflection field of advocating peace is that main to mean these respectively be pincushion deflecting magntic field and barrel-shaped magnetic deflection field aspect total.
On this chromoscope, as shown in Figure 7, be horizontal direction configuration pair of permanent magnets 27a, 27b at the end 26 upper edge left and right directions of electron gun structure 20 1 sides of arrangement for deflecting 9, so that it becomes axial symmetry and opposite polarity directions with respect to tubular axis Z.Again, play at from then on pair of permanent magnets 27a, 27b that to separate on the position 28 of predetermined space to electron gun structure one side direction be vertical direction configuration pair of permanent magnets 29a, 29b along the vertical direction, and make it similarly become axial symmetry and opposite polarity directions with respect to tubular axis Z.As permanent magnet 27a, 27b disposing, 29a, 29b promptly have following action effect.
As shown in Figure 8, strong pincushion field takes place on the road of the barrel-shaped magnetic deflection field 30 corresponding electron beam processes between electron gun structure 20 and arrangement for deflecting 9 that pair of permanent magnets 29a, the 29b that is configured in above-below direction and frame deflector coil form, and give the Lorentz force that is subjected to from barrel-shaped vertical deflection magnetic field with electron beam opposite, will make the electron-beam point distortion be the oval-shaped Lorentz force of its major axis in vertical direction, this phenomenon but the one offside electron-beam point of revisal simultaneously tilts.
From pair of permanent magnets 29a, the 29b of above-below direction to phosphor screen one side direction separate predetermined space and be configured on the left and right directions pair of permanent magnets 27a, 27b as shown in Figure 9 the road of the electron beam process between electron gun structure 32 and arrangement for deflecting 9 take place and pincushion horizontal deflection magnetic field 32 equidirectional pincushion fields 33.
Each a pair of permanent magnet 29a, 29b of above-below direction and left and right directions, 27a, 27b are owing to be configured to each opposite polarity directions, so as shown in figure 10, at pair of permanent magnets 27a, the 27b of left and right directions with in the space at tube axial direction magnetic field 34 takes place between permanent magnets adjacent 29a and the 29b separately.The direction and the direction that the bundle point of one offside electron beam B, R tilted by barrel-shaped vertical deflection magnetic field of Lorentz force that this magnetic field 34 adds to an offside electron beam is opposite, thereby can revisal inclination that caused by barrel-shaped magnetic deflection field, the bundle point on the fluoroscopic vertical ends of an offside electron beam B, R.
On June 27th, 1989 application, the application people be that Takeshi Fujiwa(rattan is former firm) he each pair of permanent magnets 29a, 29b, 27a, 27b whole dispose at grade of technology for reaching left and right directions up and down of disclosing in the patent application of U.S.'s sequence number 371,844 of waiting.Each pair of permanent magnets 29a, 29b, 27a, the 27b that below this is reached left and right directions up and down all configuration at grade occasion and pair of permanent magnets 29a, 29b and pair of right and left permanent magnet 27a, 27b do not dispose at grade and the occasion of separate configuration compares and is illustrated up and down.
At first, when reach left and right directions each pair of permanent magnets 29a, 29b up and down, when 27a, 27b all dispose in one plane, as shown in Figure 8,31, the 33 pairs of effects at the electron-beam point of fluorescent surface center's part in pincushion field with regard to each pair of permanent magnets 29a, 29b and 27a, 27b generation describe.Promptly the pincushion field 31 of the pair of permanent magnets 29a of above-below direction, 29b generation is such as already described as shown in figure 11, and the Lorentz force 36,37 that adds to electron beam makes the electron-beam point distortion be its major axis ellipse in vertical direction.In contrast, as shown in figure 12, the Lorentz force 38,39 that the pincushion field 33 that the pair of permanent magnets 27a of left and right directions, 27b take place adds to electron beam makes the electron-beam point distortion be its major axis ellipse in the horizontal direction.Thereby, the bundle point of the three electron-beam on the phosphor screen core is become roughly near orbicular bundle point by suitably setting pair of permanent magnets 29a, the 29b of above-below direction and the pair of permanent magnets 27a of left and right directions, the magnetization of 27b.But as shown in Figure 8, do at grade in the row type electron gun structure of a row configuration because to be positioned at the situation at tubular axis center opposite with central electron beam at central electron beam and an offside electron beam, the tubular axis center is left at the center of one offside electron beam, so the size of the Lorentz force that is subjected to from two pincushion fields 31,33 is different at central electron beam with an offside electron beam.Consequently, as shown in figure 13, when each magnetization to permanent magnet 29a, 29b, 27a, 27b that reaches left and right directions up and down of setting can make an offside electron-beam point become positive circle, the bundle point distortion of the central electron beam on phosphor screen was its major axis ellipse in vertical direction.The shape that becomes the point of the central electron beam of ellipse of lengthwise and an offside electron beam based on such central electron beam point is that the inconsistency of ellipticity has the image dissection degree that causes on fluoroscopic central part to worsen, and has the danger of the focusing grade of damaging chromoscope significantly.
In contrast, just being configured on pair of permanent magnets 27a with respect to left and right directions, the position that 27b separates predetermined space by pair of permanent magnets 29a, 29b with above-below direction as shown in Figure 7 can revisal central electron beam G and the inconsistency of the ellipticity of the bundle point of an offside electron beam B, R.Promptly each electron beam penetrates and a small amount of radiation side impact fluorescence screen 5 in limit from electron gun structure 20 as shown in figure 14 in vertical plane.Thereby in the zone 40 of the pincushion field effect that pair of permanent magnets 29a, the 29b of above-below direction take place, because beam diameter is still little, so the pincushion field adds to the Lorentz force of electron beam than add to the Lorentz force of electron beam when this pair of permanent magnets 29a, 29b up and down is configured in the zone 41 a little less than, the bundle point distortion that can suppress central electron beam G especially is the oval-shaped phenomenon of its major axis lengthwise in vertical direction.Again, as shown in figure 15 because an offside electron beam B, R have ejaculation obliquely from electron gun structure 20, so that be converged to a bit in the center of phosphor screen 5, so the pincushion field at pair of permanent magnets 27a, 27b that left and right directions takes place acts in the zone 41 of an offside electron beam, compare owing to central electron beam G is that tubular axis Z makes an offside electron beam B, R approaching with zone 40.Thereby when pair of permanent magnets 27a, the 27b of left and right directions are configured in the field 41, a little less than when the Lorentz force that is subjected to by the formed pincushion field of pair of permanent magnets 27a, 27b of left and right directions is configured in the zone 40 than pair of permanent magnets 27a, the 27b of left and right directions, so that equaling an offside electron beam B, R will be by the more weak zone of Lorentz force, consequently, can suppress the oval-shaped phenomenon of electron-beam point distortion for its major axis horizontal length in the horizontal direction.
Thereby, according to the pair of permanent magnets 27a of pair of permanent magnets 29a, the 29b of above-below direction and left and right directions, between the 27b tube axial direction at interval and the magnetization of the permanent magnet that each is a pair of is set at suitable intensity, thereby as shown in figure 16, just can be with the bundle point revisal of the three electron-beam of phosphor screen core for roughly positive circular.
Be on the end of a side of pair of permanent magnets 27a, 27b with the left and right directions electron gun structure that is configured in arrangement for deflecting 9 in the foregoing description 1, and the present invention is not limited thereto, for example as shown in figure 17, also can be configured in the nearby part of the iron core 24 of arrangement for deflecting 9.At this moment, owing to each a pair of permanent magnet 29a, 29b and 27a, the 27b of above-below direction and left and right directions can be configured to zone that electron beam is more dispersed, that beam diameter is big, promptly more close fluorescence screen side, thereby the action effect of the distortion of the electron-beam point on the revisal phosphor screen vertical ends is bigger, so better.
As Figure 18 and shown in Figure 19, on the end 26 of electron gun structure one side of above-mentioned arrangement for deflecting 9, except that permanent magnet 27a, 27b, also can dispose permanent magnet 35a, 35b again.Each a pair of first group of 2 utmost point permanent magnet 35a, 35b, 27a, 27b that amounts to two couples is configured in and makes its central shaft with respect to arrangement for deflecting 9 (Z axle) on the position 41 (when arrangement for deflecting 9 installs on the chromoscope about soon reaching up and down, with its tubular axis unanimity) become axial symmetry and opposite polarity directions.With second couple 2 utmost point permanent magnet 29a, 29b installs to first group of 2 utmost point permanent magnet in 2 a pair of up and down utmost point permanent magnet 35a, 35b is relative and separate, separating on the position 40 of predetermined space to electron gun structure one side on the Y-axis and from position 41, and makes polar orientation and to distinguish relative the first couple, 2 utmost point permanent magnet 5a, 35b opposite.On the end 26 of electron gun one side by first group of 2 utmost point permanent magnet 35a, 35b, 27a, 27b being configured to arrangement for deflecting and respectively dispose a pair ofly about reaching up and down, and make polarity reverse mutually like this, promptly have and above-mentioned identical following effects.
That is, as shown in figure 20, on above-mentioned each 2 utmost point permanent magnet 35a of 1 couple, 35b, 27a, the space of 27b position 41 in the central shaft of arrangement for deflecting 9, be three electron-beam be the strong pincushion field 31 and 33 of convex through formation on the road.Consequently, by opposite in above-below direction disposed pincushion field 31 that a pair of 2 utmost point permanent magnets form arrives Lorentz force that fluoroscopic electron-beam point is subjected to and the Lorentz force direction that is subjected to from barrel-shaped magnetic deflection field 30, make the electron-beam point distortion for its major axis ellipse in vertical direction, simultaneously at pair of permanent magnets 27a, the 27b of left and right directions with in the space at tube axial direction magnetic field 34 takes place between the magnetic pole of permanent magnets adjacent 29a, 29b respectively.The direction that this magnetic field 34 adds to the Lorentz force of an offside electron beam B, R and because of barrel-shaped vertical deflection magnetic field the point of one offside electron beam B, R tilted is opposite, so but the electron-beam point that revisal is caused by above-mentioned barrel-shaped vertical deflection magnetic field 30 becomes the phenomenon of its major axis oval and offside electron beam run-off the straight in the horizontal direction.
31, the 33 pairs of effects at the formed electron-beam point in phosphor screen center in pincushion field that form with regard to the first group permanent- magnet 27a, 27b, 35a, 35b describe below.As reference Figure 11 is illustrated, first pair up and down permanent magnet 35a, 35b permanent magnet 29a, 29b are identical and the pincushion field takes place up and down with second pair.The Lorentz force that this pincushion field adds to electron beam can make electron-beam point distortion on phosphor screen be its major axis ellipse in vertical direction.In contrast, the pincushion field that takes place of first couple of left and right sides permanent magnet 27a, the 27b Lorentz force that adds to electron beam can make electron-beam point distortion on phosphor screen be its major axis ellipse in the horizontal direction.Thereby, by the magnetization of permanent magnet 35a, 35b about suitably setting and left and right sides permanent magnet 27a, 27b, can make electron-beam point in fluoroscopic central area roughly near positive circular.Yet, as reference Figure 13 has illustrated, do at grade that the size of 31,32 2 Lorentz forces that are subjected to is different to central electron beam with the side electron beam from the pincushion field in the chromoscope of a row type electron gun structure of a row configuration possessing its central electron beam and an offside electron beam.Consequently, as shown in figure 16, when the magnetization of 2 utmost point permanent magnet 35a that reach pair of right and left up and down that set, 35b, 27a, 27b can make the point of 1 offside electron beam become positive circle, as shown in figure 13, central electron beam just becomes its distortion for its major axis oval pencil of forms point in vertical direction.Like this make bundle point become the image dissection degree that vertically long oval-shaped phenomenon can cause the phosphor screen core to worsen, and impair the focusing grade of chromoscope, this is undesirable.
Effect with regard to second couple 2 utmost point permanent magnet 29a, 29b describes below.As reference Figure 12 had illustrated, up and down a pair of 2 utmost point permanent magnet 35as, the 35b of the second couple, 2 utmost point permanent magnet 29a, the 29b of configuration from first group of 2 utmost point permanent magnet separates predetermined space to electron gun structure one side, and its polar orientation is opposite with first couple 2 utmost point permanent magnet 35a, 35b.Thereby the polar orientation of the pincushion field that forms of second couple 2 utmost point permanent magnet 29a, 29b is that the pincushion field 31 that forms with the first couple, 2 utmost point permanent magnet 5a, 35b in Figure 11 is opposite.Promptly the pincushion field that forms of second couple 2 utmost point permanent magnet 29a, 29b adds to pincushion field 31 that the Lorentz force of electron beam also becomes with first couple 2 utmost point permanent magnet 35a, 35b to add to the Lorentz force of electron beam opposite, and consequently making the electron-beam point distortion is its major axis ellipse in the horizontal direction.Thereby be set at also littler by the magnetization than the magnetization of 2 utmost point permanent magnet 35a, 35b a pair of about in the of first group with second couple 2 utmost point permanent magnet 29a, 29b, as shown in figure 16, can make the some distortion of an offside electron beam that leaves the tubular axis center hardly, and can be with the some revisal of central electron beam for roughly positive circular.Again, from the electron beam of electron gun structure 20 ejaculations, the limit has the center of radiation side impact fluorescence screen 5 slightly as shown in figure 14.Thereby the beam diameter 41 in the zone of the pincushion field effect that is taken place by first couple 2 utmost point permanent magnet 35a, 35b is also bigger than the beam diameter 40 in the zone of the pincushion field effect that is taken place by second couple 2 utmost point permanent magnet 29a, 29b.Again, the intensity of pincushion field itself also is that the magnetic field intensity that taken place of first couple 2 utmost point permanent magnet 35a, 35b is strong.Thereby, second couple 2 utmost point permanent magnet 29a, 29b can be positive circular with the some revisal of central electron beam, and the effect of the distortion and the side electron beam tilt phenomenon of the bundle point of the vertical axle head of phosphor screen being carried out revisal without detriment to the pincushion field that first couple 2 utmost point permanent magnet 35a, 35b form.
Again, the first group permanent-magnet 35a, 35b, 27a, 27b as shown in figure 21, act on the three electron-beam.Lorentz force actions take place on central electron beam in the magnetic field 51 that permanent magnet 35a, the 35b about promptly when vertical deflection takes place, and make its further deflection laterally.On the other hand, the Lorentz force 54 of 52 generations of the magnetic field between permanent magnet acts on side electron beam B, R is last and electron beam is returned to central authorities.For this reason, the coma aberration that the magnetic revisal that combines with on the electron gun structure and the magnetic field, rear portion of arrangement for deflecting is in the past assembled, the existing available first group permanent-magnet 35a, 35b, 27a, this coma aberration of 27b revisal.But, even in this occasion, as described above, the point of an offside electron beam becomes positive circle, and when coma aberration that the magnetization of the permanent magnet 35a, the 35b that set, 27a, 27b can revisal be assembled, central electron beam becomes distortion and is the oval-shaped bundle point of its major axis in vertical direction.Thereby can have the good focusing characteristic, and the coma aberration of can also revisal assembling by point with second couple of permanent magnet 29a, 29b revisal central electron beam.Compare with the field region of the first group permanent-magnet 35a, 35b, 27a, 27b in addition, in the field region of second pair of permanent magnet since vertical magnetic field little, can make the electron beam deflecting hardly, so the second pair of permanent magnet almost do not have influence to the coma aberration of convergence.
Embodiment 4:
Being used for of being provided with in the foregoing description 1 respectively disposed first group of 2 a pair of utmost point permanent magnet about revisal reaching up and down on the second couple, 2 utmost point permanent magnets of the distortion of the point of the electron beam at fluorophor center and end in electron gun structure one side of arrangement for deflecting a pair of 2 utmost point permanent magnets of above-below direction are relative, and separate predetermined space to electron gun structure one side, and this second couple 2 utmost point permanent magnets also can be arranged to as shown in figure 22 with first group of 2 utmost point permanent magnet in the 2 a pair of utmost point permanent magnet 27a of horizontal direction, 27b is relative, and separates predetermined space to electron gun structure one side.At this moment, the size of the magnetization of first group of 2 utmost point permanent magnet 35a, 35b and 27a, 27b preferably is set at pincushion field by each self-forming, as shown in figure 23, make the point of three central electron beams in the electron beam be roughly positive circle, the some distortion of one offside electron beam is its major axis oval-shaped state in the horizontal direction.Even herein, the pincushion field that second couple 2 utmost point permanent magnet 29a, 29b form only can be with the shape revisal of the point of an offside electron beam for roughly positive circular, and also a pair of 2 utmost point permanent magnet 35a up and down in the point of central electron beam and first group of 2 utmost point permanent magnet, the formed pincushion field of 35b carry out the effect of the coma aberration of the effect of revisal and revisal convergence to the distortion of the bundle point of phosphor screen vertical axis end.
In the foregoing description 3,4, first group of 2 utmost point permanent magnet is arranged on the end of electron gun structure one side of arrangement for deflecting, but the present invention is not limited to this, for example as shown in figure 24, also first group permanent-magnet can be arranged on the nearby part 26 of iron core 23 of arrangement for deflecting 9.This moment is because first group of 2 utmost point permanent magnet 35,27 zone that be positioned at from electron beam divergence, that beam diameter is big, so can make the action effect of distortion of point of electron beam of revisal phosphor screen vertical axis end bigger.
In the above embodiments 3,4,5, will be arranged on from first group of 2 utmost point permanent magnet and separate on the position of predetermined space to electron gun one side of arrangement for deflecting in order to the second couple, 2 utmost point magnet of the distortion of the electron beam of the fluoroscopic center of revisal, and the present invention is not limited to this, as shown in figure 25, also can be arranged on the inboard of the assembly cup 42 on the leading section that is configured in electron gun structure 20.At this moment, because of the interval that can make and be arranged on first group of 2 utmost point permanent magnet on the arrangement for deflecting 9 bigger, so better revisal in the distortion of the point of the electron beam at phosphor screen center.
The permanent magnet of pincushion field takes place as configuration pair of right and left on the end of electron gun structure one side of arrangement for deflecting, and from the end of its electron gun structure one end again the direction to electron gun structure one side separate predetermined space and dispose the permanent magnet of a pair of generation pincushion field up and down, (above-mentioned arrangement for deflecting forms and makes the three electron-beam of doing a row configuration through same plane in its orientation and and the magnetic deflection field of the direction upper deflecting of this orientation quadrature), then by this pincushion field of taking place of permanent magnet of two pairs altogether, but the distortion on the point of the electron beam that the barrel field that the revisal frame deflector coil takes place causes, and can improve the focusing performance of phosphor screen vertical axis end, simultaneously owing to the nonuniformity of energy revisal at the point of the three electron-beam of phosphor screen core, deterioration with the focusing performance that improves the phosphor screen core can provide focusing performance better and image dissection degree height, the chromoscope that performance is good.
Again, as 2 utmost point permanent magnets of each a pair of generation pincushion field up and down of configuration on the end of electron gun structure one side of arrangement for deflecting, and at 2 utmost point permanent magnets (above-mentioned arrangement for deflecting forms and makes the three electron-beam of doing a row configuration through same plane in its orientation and and the magnetic deflection field of the direction upper deflecting of this orientation quadrature) that more dispose a pair of generation pincushion field than the end of its electron gun structure one side near electron gun structure one side place, but then by this distortion of the point of the electron beam that causes of the barrel field that takes place of the pincushion field revisal frame deflector coil that takes place of three pairs 2 utmost point permanent magnets altogether, thereby can improve focusing performance in phosphor screen vertical axis end, but simultaneously because the asymmetry of the point of the three electron-beam of revisal phosphor screen core, and the focusing performance that improves the phosphor screen core becomes bad situation, thereby can provide focusing performance better, the high image dissection degree, high performance chromoscope.
Claims (7)
1, a kind of colour display tube electronic gun device comprises:
Shell with tubular axis,
A row type electron gun structure of emission central electron beam and two side electron beams in same plane,
Main make electron beam in the pincushion deflecting magntic field of the first direction upper deflecting on above-mentioned plane also main make electron beam with the deflection magnetic field generating device of the barrel-shaped magnetic deflection field of the second direction upper deflecting of first direction quadrature,
It is characterized in that also comprising:
Deflection magnetic field generating device one side between deflection magnetic field generating device and electron gun structure, along first direction and with respect to the central shaft of deflection magnetic field generating device become axial symmetry to be configured and the pole reversal relatively and first pair of permanent magnet spare in the pincushion first revisal magnetic field take place, and
Electron gun structure one side between deflection magnetic field generating device and electron gun structure separates with first pair of permanent magnet spare, become along second direction and with respect to tubular axis that axial symmetry is configured, its pole reversal is relative and second pair of permanent magnet spare in the second revisal magnetic field of pincushion takes place.
2, colour display tube electronic gun device as claimed in claim 1, its feature are that also above-mentioned first and second is arranged on the outside of kinescope shell to permanent magnet spare.
3, colour display tube electronic gun device as claimed in claim 1 is characterized in that second pair of permanent magnet spare is located in the interior electron gun structure of shell.
4, a kind of colour display tube electronic gun device comprises:
Shell with tubular axis,
A row type electron gun structure of emission central electron beam and two side electron beams in same plane,
Main make electron beam in the pincushion deflecting magntic field of the first direction upper deflecting on above-mentioned plane also main make electron beam with the deflection magnetic field generating device of the barrel-shaped magnetic deflection field of the second direction upper deflecting of first direction quadrature,
It is characterized in that also comprising:
Deflection magnetic field generating device one side between deflection magnetic field generating device and electron gun structure, along first direction become axial symmetry to be configured with second direction with respect to tubular axis and its pole reversal relatively and first group of biconjugate permanent magnet spare in the first revisal magnetic field take place, and
Electron gun structure one side between deflection magnetic field generating device and electron gun structure, from the first group permanent-magnet spare separately, become axial symmetry to be configured and the direction of its polarity and the relative first group permanent-magnet spare is opposite and second pair of permanent magnet spare in the second revisal magnetic field of pincushion takes place along the relative tubular axis of the either direction in first and second directions to electron gun structure one side.
5, colour display tube electronic gun device as claimed in claim 4 is characterized in that in the above-mentioned shell electron gun structure being housed and deflection magnetic field generating device is located on the periphery of shell.
6, colour display tube electronic gun device as claimed in claim 5 is characterized in that first group and the second pair of permanent magnet spare are contained in the outside of shell.
7, colour display tube electronic gun device as claimed in claim 5 is characterized in that second pair of permanent magnet spare is located within the shell.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP89-202446 | 1989-08-04 | ||
| JP202446/89 | 1989-08-04 | ||
| JP20244689A JP2862575B2 (en) | 1989-08-04 | 1989-08-04 | Color picture tube |
| JP252105/89 | 1989-09-29 | ||
| JP25210589A JP2859900B2 (en) | 1989-09-29 | 1989-09-29 | Color picture tube |
| JP89-252105 | 1989-09-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1049751A CN1049751A (en) | 1991-03-06 |
| CN1018408B true CN1018408B (en) | 1992-09-23 |
Family
ID=26513377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90106746A Expired CN1018408B (en) | 1989-08-04 | 1990-08-04 | Color cathode tube with deflection optical aberration improved |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0415125B1 (en) |
| KR (1) | KR930004108B1 (en) |
| CN (1) | CN1018408B (en) |
| DE (1) | DE69028968T2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69020478T2 (en) * | 1989-10-02 | 1996-02-22 | Philips Electronics Nv | Color picture tube system with reduced stain growth. |
| MY120102A (en) * | 1995-02-28 | 2005-09-30 | Toshiba Kk | A deflection unit having a distortion correcting coil in a cathode ray tube apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS542623A (en) * | 1977-06-08 | 1979-01-10 | Toshiba Corp | Color picture tube of beam-index type |
| JPH0670895B2 (en) * | 1986-10-31 | 1994-09-07 | 株式会社東芝 | Color picture tube |
-
1990
- 1990-08-03 EP EP90114987A patent/EP0415125B1/en not_active Expired - Lifetime
- 1990-08-03 KR KR1019900012025A patent/KR930004108B1/en not_active IP Right Cessation
- 1990-08-03 DE DE69028968T patent/DE69028968T2/en not_active Expired - Fee Related
- 1990-08-04 CN CN90106746A patent/CN1018408B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0415125B1 (en) | 1996-10-23 |
| KR910005366A (en) | 1991-03-30 |
| DE69028968T2 (en) | 1997-04-03 |
| KR930004108B1 (en) | 1993-05-20 |
| DE69028968D1 (en) | 1996-11-28 |
| EP0415125A1 (en) | 1991-03-06 |
| CN1049751A (en) | 1991-03-06 |
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| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
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