CN1707737A - Velocity modulation coil apparatus and cathode-ray tube apparatus - Google Patents
Velocity modulation coil apparatus and cathode-ray tube apparatus Download PDFInfo
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- CN1707737A CN1707737A CN 200510076571 CN200510076571A CN1707737A CN 1707737 A CN1707737 A CN 1707737A CN 200510076571 CN200510076571 CN 200510076571 CN 200510076571 A CN200510076571 A CN 200510076571A CN 1707737 A CN1707737 A CN 1707737A
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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
- H01J2229/5688—Velocity modulation
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Abstract
A pair of velocity modulation coils are placed with a horizontal plane including a tube axis interposed therebetween, and a pair of magnetic substances are placed with a vertical plane including a tube axis interposed therebetween. A straight line portion of the velocity modulation coil extending substantially in parallel to the tube axis is placed between the magnetic substance and the tube axis. An interval D between the magnetic substance and the straight line portion is 1 to 3 mm. Assuming that the tube axis is a Z-axis, a size of the velocity modulation coil in a tube axis direction is L, and a position of an end of the velocity modulation coil on a side opposite to a phosphor screen in the tube axis direction is Z=0, a center point of the pair of magnetic substances in the tube axis direction is present in a range of Z=0.2xL to 0.9xL. Consequently, the sensitivity of velocity modulation can be enhanced while suppressing an increase in a driving power with a simple configuration.
Description
Technical field
The present invention relates to a kind of cathode ray tube device that is used for television receiver, computer display and similar device.The invention still further relates to a kind of velocity modulation coil apparatus that will be installed on the described cathode ray tube device.
Background technology
As a kind of method that is used for realizing at television receiver higher image quality, for example, the enhancing of image border has been that people are known.In order to strengthen the image border, used velocity modulation coil.Described velocity modulation coil is located on the neck of cathode ray tube or near it, and produce the magnetic field of vertical direction, with the horizontal sweep speed of modulation electron beam, thereby, can strengthen image border (for example, seeing real public clear 57-45650 communique of Japan and Japanese kokai publication hei 6-283113 communique).
In color cathode-ray tube apparatus, along with because the increase of the diameter of the electron-baem spot on the phosphor screen that expansion caused of screen in recent years, for realizing the increase of the needed anode voltage of higher brightness, or the increase of the glacing flatness of front panel, need the more higher magnetic field of intensity to strengthen the image border.
In order to satisfy above-mentioned requirements, the someone has proposed a kind of color cathode-ray tube apparatus, it can increase the intensity (for example, Japanese kokai publication hei 6-283113 communique and TOHKEMY 2003-116019 communique) in the magnetic field that acts on electron beam under the situation of the number of turn that does not increase the magnitude of current that flows through velocity modulation coil and velocity modulation coil.
In the described color cathode-ray tube apparatus described in the Japanese kokai publication hei 6-283113 communique, the pair of magnetic body is placed in the top and the bottom of each electron beam through-hole eye of R, G on the 5th grid (G5 electrode) of being located at electron gun and B, wherein, described electron gun is contained in the neck, and a pair of velocity modulation coil is placed on the position of answering with the G5 electrode pair in the outer peripheral face of described neck.
In TOHKEMY 2003-116019 communique, a pair of velocity modulation coil and pair of magnetic body are placed on the outer peripheral face of neck in the vertical direction mode respect to one another.At this, described magnetic is placed near the center of loop (loop) of described velocity modulation coil.
In Japanese kokai publication hei 6-283113 communique and TOHKEMY 2003-116019 communique, because said structure, the magnetic flux that a pair of velocity modulation coil produced can be gathered together by the pair of magnetic body and concentrate on electron beam by the zone.Therefore, the intensity in magnetic field that is used for the velocity modulation of electron beam will reduce.
Yet in the described color cathode-ray tube apparatus described in the real public clear 57-45650 communique of above-mentioned Japan, described velocity modulation coil and horizontal deflection coil and vertical deflection coil are placed in the mode that overlaps each other on ray tube is axial.Therefore, can interfere mutually by the magnetic field of described velocity modulation coil generation with by the magnetic deflection field that described horizontal deflection coil and described vertical deflection coil produce, thereby, can make image quality decrease (so-called beating).
And, in the described color cathode-ray tube apparatus described in the Japanese kokai publication hei 6-283113 communique, because the vortex flow that produces on the surface for the electrode of hardware (G5 electrode) can cause damage, therefore, the electron beam in the G5 electrode will be very low by the intensity in the magnetic field of zone generation.Therefore, even described magnetic is connected on the G5 electrode assembling original very weak magnetic flux, but can not expect that magnetic field intensity obtains gratifying increase.In other words, in Japanese kokai publication hei 6-283113 communique, the sensitivity of velocity modulation (the velocity modulation amount of the electron beam for the electric current of the described velocity modulation coil of input) can not sufficiently be improved.In addition, described magnetic is placed on the G5 electrode that constitutes the electron gun in the neck, and therefore, the element assembling can increase man-hour, thereby, can cause cost to increase.
In addition, though described magnetic as described in the above-mentioned TOHKEMY 2003-116019 communique, be placed on as described in the center of loop of velocity modulation coil, can not be reduced fully with respect to the magnetic resistance in the magnetic field that produces by described velocity modulation coil.Therefore, can't obtain enough good velocity modulation effect.
On the other hand, high-intensity magnetic field also can obtain by the number of turn that increases described velocity modulation coil, rather than places magnetic in Japanese kokai publication hei 6-283113 communique and TOHKEMY 2003-116019 communique.Yet in this case, the impedance meeting of described velocity modulation coil increases, thereby, must apply high-powerly to described velocity modulation coil, can cause the cost of drive circuit to increase like this.
Therefore, under the situation that does not increase driving power, improve the also not realization of method of the reinforced effects of image border by velocity modulation coil.
Summary of the invention
The invention solves above-mentioned traditional problem, its objective is provides a kind of velocity modulation coil apparatus, it can improve velocity modulation by simple structure under the situation that suppresses driving power increase (that is, impedance increases) sensitivity.Another object of the present invention provides a kind of cathode ray tube device, wherein, because this velocity modulation coil apparatus picture quality can improve by strengthening the image border under the not excessive situation of cost.
Velocity modulation coil apparatus of the present invention comprises a pair of velocity modulation coil and the pair of magnetic body that is used for the horizontal deflection speed of the electron beam that modulation sends from an electron gun, and is placed on the outer peripheral face of cone of a cathode ray tube.Described a pair of velocity modulation coil is placed in the following manner, promptly the horizontal plane of a ray tube axis that comprises described cathode ray tube is between them, described pair of magnetic body is placed in the following manner, and promptly the vertical plane of a described ray tube axis that comprises described cathode ray tube is between them.Described velocity modulation coil comprises a line part, and its described ray tube axis that is roughly parallel to described cathode ray tube extends, and described line part is placed between the described ray tube axis of described magnetic and described cathode ray tube.Interval D between described magnetic and the described line part is 1 to 3mm.The described ray tube axis of supposing described cathode ray tube is the Z axle, the position of the end that is positioned at the phosphor screen opposition side of described velocity modulation coil on ray tube is axial is Z=0, the position of the end that is positioned at fluorescence screen side of described velocity modulation coil on described ray tube is axial is Z=L, the coordinate Z of the central point of then described magnetic on described ray tube is axial
MSatisfy following relation: 0.2 * L≤Z
M≤ 0.9 * L.
In addition, cathode ray tube device of the present invention comprises: cathode ray tube, and it comprises an electron gun that is formed with in the neck that fluoroscopic panel, cone that is connected with described panel and is contained in described cone on inner surface; Horizontal deflection coil and vertical deflection coil, they are located on the outer peripheral face of described cone, are used to make the electron beam deflection in the horizontal and vertical directions of sending from described electron gun, so that the described phosphor screen of described electron beam scanning; And velocity modulation coil apparatus, it is located on the described outer peripheral face of described cone.Described velocity modulation coil apparatus is an above-mentioned velocity modulation coil apparatus of the present invention.
Description of drawings
Fig. 1 is a partial sectional view, shows the schematic structure of color cathode-ray tube apparatus according to an embodiment of the invention;
Fig. 2 is neck and near the amplification view of neck in the described color cathode-ray tube apparatus according to an embodiment of the invention;
Fig. 3 A is the perspective schematic view of velocity modulation coil apparatus according to an embodiment of the invention; Fig. 3 B is the front view of the described velocity modulation coil apparatus according to an embodiment of the invention when the ray tube axis is seen; And Fig. 3 C is the expansion view of a velocity modulation coil;
Fig. 4 A shows the state of the magnetic flux that a pair of velocity modulation coil produces under the situation that the pair of magnetic body is not set; And Fig. 4 B shows the state of the magnetic flux that a pair of velocity modulation coil produces in being provided with the of the present invention described velocity modulation coil apparatus of pair of magnetic body;
Fig. 5 shows the relation between the ordinate graph thinning rate of interval D between described velocity modulation coil and the described magnetic and screen;
Fig. 6 show described magnetic ray tube axially on respect to the relation between the ordinate graph thinning rate of the relative position of described velocity modulation coil and screen;
Fig. 7 is an end view, show among Fig. 6 described magnetic ray tube axially on respect to the definition of the relative position of described velocity modulation coil;
Fig. 8 shows opening portion between the pair of magnetic body with respect to the relation between the ordinate graph thinning rate of the angle θ of ray tube axis and screen;
Fig. 9 shows opening portion between the pair of magnetic body with respect to the relation between the T/B distortion variations amount of the angle θ of ray tube axis and screen;
Figure 10 shows opening portion between the pair of magnetic body with respect to the relation between the VCR variable quantity of the angle θ of ray tube axis and screen; And
Figure 11 is neck in according to another embodiment of the invention the color cathode-ray tube apparatus and near the amplification view the neck.
Embodiment
According to the present invention, with respect to the magnetic resistance of the magnetic flux that produces by a pair of velocity modulation coil owing to the pair of magnetic body is reduced.Therefore, the electron beam in the described neck can obtain increasing by the magnetic flux density in zone.Therefore, can under the situation that does not increase driving power, improve the sensitivity of velocity modulation, thereby picture quality can improve owing to the enhancing of image border.
In the present invention, preferably, an opening portion between the described pair of magnetic body is 50 ° to 90 ° with respect to the angle θ of the described ray tube axis of described cathode ray tube.According to said structure, the sensitivity of velocity modulation can be further enhanced, and can reduce owing to the new image fault and the misconvergence that exist described pair of magnetic body to cause simultaneously.
Preferably, described magnetic is 2 to 5mm at the length H of described ray tube on axially.When described magnetic at the length H of described ray tube on axially during greater than above-mentioned scope, cost can increase, and described cathode ray tube device also can increase in the size of described ray tube on axially.When described magnetic at the length H of described ray tube on axially during less than above-mentioned scope, the mechanical strength of described magnetic can reduce again.
Suppose that described magnetic is H in the length of described ray tube on axially, the thickness of described magnetic on the direction of a horizontal axis that passes described ray tube axis is T, preferably satisfies following relation: T/H 〉=1.Like this, the electron beam that can further increase in the described neck passes through regional magnetic flux density.
Preferably, described magnetic is with at least a magnetic sintered body in next group material: Mg-Zn ferrite, Mn-Zn ferrite and Ni-Zn ferrite.Like this, can make magnetic have high magnetic permeability, thereby the sensitivity of velocity modulation can be improved.
As a kind of alternative method, described magnetic also can be made by the resin of having sneaked into at least a magnetic in next group material: Mg-Zn ferrite, Mn-Zn ferrite and Ni-Zn ferrite.Like this, can provide magnetic at low cost.And, the pair of magnetic body be placed can be used as form one assemble the purity unit (Convergenceand Purity Unit, the separator between magnet CPU), thereby CPU can obtain shortening in the size of described ray tube on axially.
Preferably, a pair of velocity modulation coil is placed on described neck side with respect to described horizontal deflection coil and described vertical deflection coil.When described a pair of velocity modulation coil be placed described ray tube axially on described horizontal deflection coil and described vertical deflection coil when overlapping, will interfere each other by the magnetic flux of described velocity modulation coil generation with by the magnetic flux that described level and vertical deflection coil produce, thereby can cause beat (ringing), like this, will reduce the sensitivity of picture quality and velocity modulation.
Preferably, the position of described pair of magnetic body on ray tube is axial is consistent with the position of two gaps between electrodes on described ray tube is axial of described electron gun, wherein, described two electrodes are arranged apart from each other described ray tube is axial, and form a main lens.Like this, just can prevent magnetic field that described a pair of velocity modulation coil produces owing to the eddy current losses that electrode causes is consumed, and then can prevent the reduction of the sensitivity of velocity modulation.
Below, will the present invention be described referring to accompanying drawing.
Fig. 1 is a partial sectional view, shows the schematic structure of color cathode-ray tube apparatus 1 according to an embodiment of the invention.For the ease of following description, suppose that the ray tube axis is the Z axle, level (phosphor screen long side direction) axis is an X-axis, vertically (phosphor screen short side direction) axis is a Y-axis.X-axis, Y-axis are vertical mutually with the Z axle.In Fig. 1, shown in the Z axle upside is cutaway view, and shown in the Z axle downside is outside drawing.
As shown in Figure 1, color cathode-ray tube apparatus 1 is made of a color cathode ray tube 10, deflection yoke 30, CPU 40, velocity modulation coil apparatus 50 and analog.
Color cathode ray tube 10 comprises one by a panel 11 being connected on the cone 12 glass bulb that forms and being contained in shadow mask 15 in the described glass bulb and array type electron gun (below, only be called " electron gun ") 16.
Form a phosphor screen 14 on the inner surface of panel 11, wherein, each phosphor dot of red, green and blue (or fluorescence striped) is periodically arranged.Shadow mask 15 is provided with constant at interval from phosphor screen 14.A plurality of electron beam through-hole eyes are located in the shadow mask 15.Three electron beams 18 that send from electron gun 16 (three electron beams become row parallel with X-axis to arrange, therefore, only show an electron beam of front side among Fig. 1) are by being located at the described electron beam through-hole eye in the shadow mask 15, the fluorophor of expecting with bump.
Fig. 2 is an amplification view, shows near the part for the neck 13 of cylindrical shape in the cone 12.
Electron gun 16 is contained in the neck 13.Electron gun 16 will the negative electrode K of heating (only show among Fig. 2 along X-axis and become a negative electrode that is positioned at the front side in three negative electrodes that row arrange), each electrode G1, G2, G3, G4, G5A, G5B and G6, a shielding cup cover SC and an analog that is connected on the electrode G6 of placing with predetermined space successively along the ray tube axis on 14 the direction from negative electrode K towards phosphor screen constitute separately respectively by three heater (not shown) by three.In electron gun 16, a main lens 17 is formed between electrode G5B and the electrode G6.Main lens 17 accumulates in each electron beam 18 on the phosphor screen 14.
Fig. 3 A is the perspective schematic view of velocity modulation coil apparatus 50 according to an embodiment of the invention.Fig. 3 B is the front view of the velocity modulation coil apparatus 50 when the ray tube axis is seen.Fig. 3 C is the expansion view of velocity modulation coil.
Velocity modulation coil apparatus 50 comprises a pair of velocity modulation coil 52a, 52b and pair of magnetic body 54a, 54b, wherein, velocity modulation coil 52a, 52b place in the following manner, promptly a horizontal plane (XZ face) that comprises the ray tube axis is between them, magnetic 54a, 54b place in the following manner, and promptly a vertical plane (YZ face) that comprises the ray tube axis is between them.In the following description, a pair of velocity modulation coil 52a, 52b can be called velocity modulation coil 52 generally, and pair of magnetic body 54a, 54b also can be called magnetic 54 generally.
Under the state of planar development, velocity modulation coil 52a, 52b are the ring coil that is general square shape.In four limits that constitute described ring coil, a pair of limit respect to one another (line part) 53a is to place with the mode of Z axle almost parallel, a pair of in addition limit respect to one another (bend) 53b roughly places along the XY face by this way, promptly according to the curvature of the outer peripheral face of resinous framework 42 with roughly arcuate shape bending.
In one example, copper cash by twining four circles and applying polyurethane coating of velocity modulation coil 52a, 52b (line footpath: 0.4[mm]) forms.Shown in Fig. 3 C, be under the state of planar development at velocity modulation coil 52a, 52b, be made as 25[mm along the size L of line part 53a], be made as 35[mm along the width W 1 (being under the state of planar development) of bend 53b].When a pair of velocity modulation coil 52a, 52b were connected on the resinous framework 42 under bend 53b is bent to the situation of arcuate shape roughly, their outer diameter D c was φ 33.5[mm], the size W2 on the X-direction is approximately 30[mm].At this, the outer diameter D c of a pair of velocity modulation coil 52a, 52b is meant the diameter with the external imaginary circle cylinder of velocity modulation coil 52a, 52b.
Both all are roughly arcuate shape magnetic 54a, 54b, and are being connected on this position on the resinous framework 42, and promptly on this position, they are roughly symmetrical and overlapping with a pair of velocity modulation coil 52a, 52b on Z-direction with respect to the Z axle.Shown in Fig. 3 B, each line part 53a of velocity modulation coil 52a, 52b is placed on respectively between magnetic 54a (or 54b) and the Z axle.Specifically, arc length and the link position of magnetic 54a, 54b are set by this way, and promptly one is passed Z axle and line part 53a and crossing perpendicular to the straight line and the magnetic 54a (or 54b) of Z axle.Therefore, the ratio that pair of magnetic body 54a, 54b account for the magnetic circuit of the magnetic flux that is produced by a pair of velocity modulation coil 52a, 52b can increase, thereby magnetic resistance can reduce, and so just can improve the sensitivity of velocity modulation.
In one example, magnetic 54a, 54b make by the ferritic magnetic sintered body of Mg-Zn, and resistivity is 1 * 10
5[Ω m].When pair of magnetic body 54a, 54b are connected on the resinous framework 42, their inside diameter D
M1Be φ 36.8[mm], outer diameter D
M2Be φ 46.8[mm], be 5[mm along the thickness T of X-axis], the length H (see figure 7) on the Z-direction is 2.5[mm].And the opening portion 55 between pair of magnetic body 54a, the 54b is made as 70 ° with respect to the angle θ (separately angle) of Z axle.Interval D between the line part 53a of magnetic 54a (or 54b) and velocity modulation coil 52a (or 52b) in the XY face is 1.65[mm].On Z-direction, pair of magnetic body 54a, 54b are with respect to roughly symmetry placement of a pair of velocity modulation coil 52a, 52b.
Above-mentioned velocity modulation coil is adorned 50 magnetic flux densities that a pair of velocity modulation coil 52a, 52b are produced and is increased in neck 13, thereby, can make flux interaction in electron beam 18.
Below, will be described referring to Fig. 4 A and 4B.Fig. 4 A shows the state of the magnetic flux that a pair of velocity modulation coil 52a, 52b produce under the situation that pair of magnetic body 54a, 54b are not set.Fig. 4 B shows the state of the magnetic flux that a pair of velocity modulation coil 52a, 52b produce under the situation that is provided with pair of magnetic body 54a, 54b.Fig. 4 A and 4B show one respectively and pass the line part 53a of velocity modulation coil 52a, 52b and perpendicular to the magnetic flux on the plane of Z axle.
Be appreciated that when being provided with pair of magnetic body 54a, 54b that from Fig. 4 A and 4B on pair of magnetic body 54a, the residing part of 54b, magnetic flux can pass through pair of magnetic body 54a, 54b in the magnetic circuit in neck 13 outsides, therefore, magnetic resistance can be reduced.Thereby in the zone that electron beam passes through in neck 13, the magnetic flux density that is produced by a pair of velocity modulation coil 52a, 52b will increase.
Below, the line part 53a that will describe magnetic 54a (or 54b) and velocity modulation coil 52a (or 52b) referring to Fig. 5 is perpendicular to the relation between the sensitivity of interval D on the XY face of ray tube axis and velocity modulation.
In Fig. 5, transverse axis is represented above-mentioned interval D, and the longitudinal axis is represented the graph thinning rate (thinning ratio) of the ordinate on the screen of described cathode ray tube device.At this, described ordinate graph thinning rate obtains in the following way.The described velocity modulation coil apparatus of stating in the use in the example drives under the situation of a pair of velocity modulation coil 52a, 52b with the driving power of 4.0W, utilizes the NTSC signal to show hatching formula pattern (crosshatching pattern) on screen.Acquisition is at the ordinate width A under the situation that does not have pair of magnetic body 54a, 54b and be provided with ordinate width B under the situation of pair of magnetic body 54a, 54b, and with (B/A) * 100[%] be made as ordinate graph thinning rate.Described ordinate graph thinning rate obtains by repeatedly differently changing interval D.When the sensitivity of velocity modulation improved, the ordinate width can narrow down, and the edge can be enhanced, thereby, can improve the definition (acutance) of picture quality.Generally speaking, when ordinate graph thinning rate is (hatched example areas among Fig. 5) below 80%, can think, can be from visually identifying the improve effect of velocity modulation to picture quality.
Below describe and to understand by Fig. 5.Picture quality can improve by pair of magnetic body 54a, 54b are provided.Especially, when interval D was 1 to 3mm, ordinate graph thinning rate became below 80%, and the sensitivity of velocity modulation can be improved, and in this case, just can obtain gratifying image.
Below, will referring to Fig. 6 describe pair of magnetic body 54a, 54b and a pair of velocity modulation coil 52a, 52b ray tube on axially relative position and the relation between the sensitivity of velocity modulation.
In Fig. 6, the longitudinal axis is represented the ordinate graph thinning rate that defines in the mode similar to Fig. 5.Transverse axis is represented pair of magnetic body 54a, 54b with respect to a pair of velocity modulation coil 52a, the 52b relative position on ray tube is axial, and it defines as follows.
As shown in Figure 7, suppose that velocity modulation coil 52a, 52b are of a size of L on Z-direction, the position of velocity modulation coil 52a, a 52b end of a side opposite with phosphor screen on Z-direction is initial point (Z=0), velocity modulation coil 52a, 52b are Z=L in the position of an end of fluorescence screen side, and fluorescence screen side is the positive direction of Z axle.Pair of magnetic body 54a, 54b obtain with respect to the relative position of a pair of velocity modulation coil 52a, 52b on axially in the following manner at ray tube, promptly express the Z axial coordinate Z of central point of Z-direction that length on the Z-direction is magnetic 54a, the 54b of H with L
M
Ordinate graph thinning rate is stated in the use under described velocity modulation coil apparatus in the example drives a pair of velocity modulation coil 52a, 52b with the driving power of 4.0W the situation and is obtained (" a pair of left and right sides magnetic " among Fig. 6) by repeatedly differently changing above-mentioned relative position.Similarly, by at Z
MOn the position of=0.6 * L pair of magnetic body 54a, 54b are rotated 90 ° so that their in the vertical directions obtain (" a pair of magnetic up and down " among Fig. 6) acquisition ordinate graph thinning rate in this case toward each other around the Z axle.
From Fig. 6 be appreciated that when expression pair of magnetic body 54a, 54b ray tube axially on respect to the Z of the relative position of a pair of velocity modulation coil 52a, 52b
MSatisfy following relation: 0.2 * L≤Z
MDuring≤0.9 * L, ordinate graph thinning rate will become (hatched example areas among Fig. 6) below 80%, and the sensitivity that can improve velocity modulation, in this case, can obtain gratifying image.Be placed with under the in the vertical direction situation respect to one another at pair of magnetic body 54a, 54b, even they also are placed in the above-mentioned scope, the raising effect of the sensitivity of velocity modulation also can reduce.
Below, will opening portion 55 between pair of magnetic body 54a, the 54b be described with respect to the relation between the sensitivity of the angle θ of ray tube axis and velocity modulation referring to Fig. 8.
In Fig. 8, transverse axis is represented above-mentioned angle θ, and the longitudinal axis is represented the ordinate graph thinning rate on the screen of described cathode ray tube device.At this, described ordinate graph thinning rate obtains in the following way.The described velocity modulation coil apparatus of stating in the use in the example drives under the situation of a pair of velocity modulation coil 52a, 52b with the driving power of 4.0W, utilizes the NTSC signal to show hatching formula pattern on screen.Acquisition is in the ordinate width C under the situation that does not have pair of magnetic body 54a, 54b and be provided with ordinate width E under the situation of pair of magnetic body 54a, 54b, and with (E/C) * 100[%] be made as ordinate graph thinning rate.Described ordinate graph thinning rate obtains by repeatedly differently changing angle θ.When the sensitivity of velocity modulation improved, the ordinate width can narrow down, and the edge can be enhanced, thereby, can improve the definition of picture quality.Generally speaking, when ordinate graph thinning rate is (hatched example areas among Fig. 8) below 80%, can think, can be from visually identifying the improve effect of velocity modulation to picture quality.
Below describe and to understand by Fig. 8.Picture quality can improve by pair of magnetic body 54a, 54b are provided.Especially, when angle θ is below 90 ° the time, ordinate graph thinning rate becomes below 80%, and the sensitivity of velocity modulation can be improved, and in this case, just can obtain gratifying image.
Below, will opening portion 55 between pair of magnetic body 54a, the 54b be described with respect to the angle θ of ray tube axis and the relation between the T/B distortion referring to Fig. 9.
In Fig. 9, transverse axis is represented above-mentioned angle θ, and the longitudinal axis is represented T/B distortion variations amount.The T/B distortion refers to the pincushion distortion of the grating in the top and the bottom of screen, and it is a type of pattern distortion.T/B distortion variations amount obtains in the following way.The described velocity modulation coil apparatus of stating in the use in the example drives under the situation of a pair of velocity modulation coil 52a, 52b with the driving power of 4.0W, utilizes the NTSC signal to show hatching formula pattern on screen.Acquisition is at the T/B distortion F[% under the situation that does not have pair of magnetic body 54a, 54b] and be provided with T/B distortion G[% under the situation of pair of magnetic body 54a, 54b], and with G-F[%] be made as T/B distortion variations amount.Described T/B distortion variations amount obtains by repeatedly differently changing angle θ.The T/B distortion is according to EIAJED-2101B " be provided with the test method of the Brown tube of deflection yoke " the pincushion distortion experimental measurement of (EIAJ's specification).Generally speaking, as T/B distortion variations 0.1[%] when above, can think, can be from visually identifying the variation of image fault.
Below describe and to understand by Fig. 9.If angle θ is in 50 ° to 90 ° the scope (hatched example areas among Fig. 9), the absolute value that has or not pairing T/B distortion variations amount of pair of magnetic body 54a, 54b is 0.1[%] below, therefore, the existence of pair of magnetic body 54a, 54b can cause new image fault hardly.
Below, will opening portion 55 between pair of magnetic body 54a, the 54b be described with respect to the angle θ of ray tube axis and the relation between the VCR referring to Figure 10.
In Figure 10, transverse axis is represented above-mentioned angle θ, and the longitudinal axis is represented the VCR variable quantity.VCR refers to locate the misconvergence on Y direction between both sides electron beam and the center electron beam at the intersection point of the neighboring of Y-axis and screen (Y-axis end).The VCR variable quantity obtains in the following way.The described velocity modulation coil apparatus of stating in the use in the example drives under the situation of a pair of velocity modulation coil 52a, 52b with the driving power of 4.0W, utilizes the NTSC signal to show hatching formula pattern on screen.Acquisition is at the VCR value H[mm under the situation that does not have pair of magnetic body 54a, 54b] and be provided with VCR value J[mm under the situation of pair of magnetic body 54a, 54b], and with J-H[mm] be made as the VCR variable quantity.Described VCR variable quantity obtains by repeatedly differently changing angle θ.VCR is according to EIAJED-2101B " be provided with the test method of the Brown tube of deflection yoke " the convergence experimental measurement of (EIAJ's specification).Generally speaking, when VCR changes 0.1[mm] when above, can think, can assemble variation from visually identifying.
Below describe and to understand by Figure 10.When angle θ was (hatched example areas among Figure 10) below 90 °, the absolute value that has or not pairing VCR variable quantity of pair of magnetic body 54a, 54b was 0.1[mm] below, therefore, the existence of pair of magnetic body 54a, 54b can cause new misconvergence hardly.
Be appreciated that from Fig. 8 to 10 sensitivity of velocity modulation is improved when angle θ is 50 ° to 90 °, and picture quality because can improving, the enhancing of image border and can not cause new image fault and misconvergence.
When magnetic 54a, the 54b length H on ray tube is axial becomes longer, can strengthen the increase effect of magnetic flux density.Yet the increase of the material cost of magnetic and the increase of mould can cause cost to increase.And the size of ray tube on axially that the CPU 40 of magnetic 54a, 54b is installed also can increase, and will cause the material cost of CPU 40 to increase like this and the molded output reduction of resinous framework 42.Thereby, can increase overall cost widely.Therefore, preferred length H on be limited to about 5mm.On the contrary, when magnetic 54a, the 54b length H on ray tube is axial becomes less than 2mm, mechanical strength will reduce, thereby, under being used for fixing the effect of each magnet with the fastening load (for example more than the 49N) of the screw-type retaining element that it is positioned over the side opposite with phosphor screen among the CPU 40, magnetic 54a, 54b can be destroyed.Therefore, magnetic 54a, the 54b length H on ray tube is axial preferably is in the scope of 2mm to 5mm.Can improve the definition of picture quality so at low cost.
Suppose that magnetic 54a, the 54b length on ray tube is axial is H, magnetic 54a, 54b are T at the thickness that passes on the horizontal axis direction of ray tube axis, preferred satisfied following relation: T/H 〉=1.When thickness T during greater than length H, the electron beam in the neck can be further enhanced by the magnetic flux density in the zone.
The present invention is not limited to the foregoing description and example, but can as described belowly change by different way.
(1) for example, in the above-described embodiments, velocity modulation coil 52 and magnetic 54 are connected on the resinous framework 42 of CPU 40.The present invention is not limited thereto, and they also can be connected on the deflection yoke 30.Figure 11 shows a kind of like this embodiment.
As shown in figure 11, in the present embodiment, the resinous framework 39 that horizontal deflection coil 32 and 36 insulation of vertical deflection coil is come and supporting deflection yoke 32,36 in the deflection yoke 30 extends to neck 13, and velocity modulation coil 52 and magnetic 54 are connected on the extension 39a of cylindrical shape.Specifically, in the embodiment shown in fig. 11, velocity modulation coil 52 and magnetic 54 integral body are connected on the deflection yoke 30.
In the present embodiment, purity magnet 44, quadrupole magnet 46 and the six-pole magnet 48 of formation CPU 40 also are connected on the extension 39a of resinous framework 39.In this, in the present embodiment, can think that CPU 40 and deflection yoke 30 are provided with integral way.
(2) compare with the embodiment shown in Fig. 2, in the embodiment shown in fig. 11, velocity modulation coil 52 extends fartherly to horizontal deflection coil 32 sides, and in this case, protrude to fluorescence screen side from the end of the fluorescence screen side of shielding cup cover SC the end of the fluorescence screen side of velocity modulation coil 52.The magnetic flux that comes from the part that velocity modulation coil 52 protrudes can for example acted on electron beam under the electrode of electron gun 16 and the situation that shielding cup cover SC absorbs by hardware hardly.Therefore, the sensitivity of velocity modulation can be improved.
At this, should be noted that the end of the fluorescence screen side that does not make velocity modulation coil 52 is protruded excessively, promptly do not make velocity modulation coil 52 approach very much horizontal deflection coil 32.When velocity modulation coil 52 approaches horizontal deflection coil 32 very much, will exceedingly produce mutual interference by the magnetic field of velocity modulation coil 52 generations and the magnetic field that produces by horizontal deflection coil 32, thereby, can make the image on the described phosphor screen produce so-called beating.In one example, confirmed following situation.If the distance L 1 between the end of the electron gun side of the end of the fluorescence screen side of velocity modulation coil 52 and horizontal deflection coil 32 is made as 8mm when above, cause that beating of problem just can not take place.
(3) in the above-described embodiments, magnetic 54 in the position of ray tube on axially with G5 electrode and G6 gaps between electrodes the position roughly consistent (coupling) on ray tube is axial.This be because, a main lens is formed in above-mentioned these two gaps between electrodes, and, generally speaking (even in this example), the gaps between electrodes that forms main lens is greater than any other gaps between electrodes.Therefore, the magnetic flux that is produced by velocity modulation coil 52 can concentrate in the described wide gap, thereby, absorb and can be reduced by the metal material that constitutes described electrode by the magnetic flux of vortex flow consumption.
Yet magnetic 54 also can consistent with other gaps between electrodes (coupling) in the position of ray tube on axially, rather than consistent with above-mentioned gaps between electrodes (coupling).Reason is as follows.As long as magnetic 54 is placed with like this, promptly corresponding with axial two gaps between electrodes adjacent one another are of ray tube, eddy current losses just can be reduced, and in this case, magnetic flux can concentrate on electron beam by the zone.
And the number of magnetic needn't be for a pair of.Also can prepare manyly to be placed on respectively in a plurality of gaps between the electrode to magnetic with them.Therefore, whole electron beam by the zone in magnetic flux all can increase, thereby the sensitivity of velocity modulation can be further enhanced.
(4) in the above-described embodiments, although magnetic 54 is formed arc, needn't have pure arc.Magnetic 54 can have by along two sections the ring bodies of an ellipse or polygon (being preferably the polygon more than five limits) being divided into the shape that two parts obtain.Under any circumstance, keep symmetry in order to make the magnetic flux that results from the neck 13, preferably, magnetic 54 is to form with respect to the vertical plane symmetrical manner that comprises the ray tube axis.
(5) in the above-described embodiments, magnetic is the ferritic magnetic sintered body of Mg-Zn.The present invention is not limited thereto, and described magnetic also can be Ni-Zn ferrite or the ferritic magnetic sintered body of Mn-Zn.
As a kind of alternative method, the described magnetic also magnetic of available such formation substitutes sintered body, promptly sneaks into any above-mentioned magnetic and then molded and shaped in resin.Like this, compare, can reduce cost with the situation of using sintered body.
(6) in the above-described embodiments, as example color cathode-ray tube apparatus has been described.The present invention is not limited thereto, and it also is applicable to monochromatic cathode ray tube for example projection type cathode ray tube and cathode ray tube device.
Suitable application area of the present invention does not have particular restriction, and the present invention can be widely used in television receiver, computer display and similar device.
The present invention can otherwise realize under the situation that does not break away from its spirit or essential characteristic.The disclosed embodiments all should be thought exemplary, but not determinate in all respects in the application's book.Scope of the present invention is limited by claims rather than the description done by the front, this be included in that being equal to of claims carried out in the meaning and the scope change.
Claims (9)
1. the velocity modulation coil apparatus on the outer peripheral face of a cone that is located at cathode ray tube comprises: a pair of velocity modulation coil, and they are used for the horizontal deflection speed of the electron beam that modulation sends from electron gun; And the pair of magnetic body,
Wherein, described a pair of velocity modulation coil is placed in the following manner, promptly the horizontal plane of a ray tube axis that comprises described cathode ray tube between them,
Described pair of magnetic body is placed in the following manner, promptly the vertical plane of a described ray tube axis that comprises described cathode ray tube between them,
Described velocity modulation coil comprises a line part, and its described ray tube axis that is roughly parallel to described cathode ray tube extends,
Described line part is placed between the described ray tube axis of described magnetic and described cathode ray tube,
Interval D between described magnetic and the described line part is 1 to 3mm, and
The described ray tube axis of supposing described cathode ray tube is the Z axle, the position of the end that is positioned at the phosphor screen opposition side of described velocity modulation coil on ray tube is axial is Z=0, the position of the end that is positioned at fluorescence screen side of described velocity modulation coil on described ray tube is axial is Z=L, the coordinate Z of the central point of then described magnetic on described ray tube is axial
MSatisfy following relation: 0.2 * L≤Z
M≤ 0.9 * L.
2. velocity modulation coil apparatus as claimed in claim 1 is characterized in that, an opening portion between the described pair of magnetic body is 50 ° to 90 ° with respect to the angle θ of the described ray tube axis of described cathode ray tube.
3. velocity modulation coil apparatus as claimed in claim 1 is characterized in that, described magnetic is 2 to 5mm at the length H of described ray tube on axially.
4. velocity modulation coil apparatus as claimed in claim 1, it is characterized in that, suppose that described magnetic is H in the length of described ray tube on axially, the thickness of described magnetic on the direction of a horizontal axis that passes described ray tube axis is T, then satisfies following relation: T/H 〉=1.
5. velocity modulation coil apparatus as claimed in claim 1 is characterized in that, described magnetic is with at least a magnetic sintered body in next group material: Mg-Zn ferrite, Mn-Zn ferrite and Ni-Zn ferrite.
6. velocity modulation coil apparatus as claimed in claim 1 is characterized in that, described magnetic is made by the resin of having sneaked into at least a magnetic in next group material: Mg-Zn ferrite, Mn-Zn ferrite and Ni-Zn ferrite.
7. cathode ray tube device comprises:
Cathode ray tube, it comprises an electron gun that is formed with in the neck that fluoroscopic panel, cone that is connected with described panel and is contained in described cone on inner surface;
Horizontal deflection coil and vertical deflection coil, they are located on the outer peripheral face of described cone, are used to make the electron beam deflection in the horizontal and vertical directions of sending from described electron gun, so that the described phosphor screen of described electron beam scanning; And
Velocity modulation coil apparatus, it is located on the described outer peripheral face of described cone,
Wherein, described velocity modulation coil apparatus is as arbitrary described velocity modulation coil apparatus in the claim 1 to 6.
8. cathode ray tube device as claimed in claim 7 is characterized in that, a pair of described velocity modulation coil is placed on described neck side with respect to described horizontal deflection coil and described vertical deflection coil.
9. cathode ray tube device as claimed in claim 7, it is characterized in that, the position of described pair of magnetic body on ray tube is axial is consistent with the position of two gaps between electrodes on described ray tube is axial of described electron gun, described two electrodes are arranged apart from each other described ray tube is axial, and form a main lens.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004174125 | 2004-06-11 | ||
| JP174126/2004 | 2004-06-11 | ||
| JP174125/2004 | 2004-06-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1707737A true CN1707737A (en) | 2005-12-14 |
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ID=35581529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510076571 Pending CN1707737A (en) | 2004-06-11 | 2005-06-10 | Velocity modulation coil apparatus and cathode-ray tube apparatus |
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| Country | Link |
|---|---|
| CN (1) | CN1707737A (en) |
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2005
- 2005-06-10 CN CN 200510076571 patent/CN1707737A/en active Pending
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