CN1132217C - Colour cathode-ray tube - Google Patents
Colour cathode-ray tube Download PDFInfo
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- CN1132217C CN1132217C CN98109280A CN98109280A CN1132217C CN 1132217 C CN1132217 C CN 1132217C CN 98109280 A CN98109280 A CN 98109280A CN 98109280 A CN98109280 A CN 98109280A CN 1132217 C CN1132217 C CN 1132217C
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- shadow mask
- mentioned
- mask frame
- supporter
- main body
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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
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/06—Screens for shielding; Masks interposed in the electron stream
- H01J29/07—Shadow masks for colour television tubes
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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
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/06—Screens for shielding; Masks interposed in the electron stream
- H01J29/07—Shadow masks for colour television tubes
- H01J29/073—Mounting arrangements associated with shadow masks
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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
- H01J2229/07—Shadow masks
- H01J2229/0716—Mounting arrangements of aperture plate to frame or vessel
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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
- H01J2229/07—Shadow masks
- H01J2229/0727—Aperture plate
- H01J2229/0788—Parameterised dimensions of aperture plate, e.g. relationships, polynomial expressions
Abstract
In the present invention, a shadow mask opposed to a phosphor screen of a panel has a rectangular mask body and a rectangular mask frame fixed to the periphery of the mask body. The mask body has a pair of long side edges and a pair of short side edges, and the long side edges are respectively welded to long side walls of the mask frame while the short side edges are respectively welded to short side walls of the mask frame. The long and short side walls of the mask frame are respectively supported on the panel by mask holders. Each mask holder has a fixed portion welded to the mask frame and an engaging portion engaged with a stud pin of the panel. Welding positions (41a) between the long side edges of the mask body and the long side walls of the mask frame are shifted from the short axis, and welding positions between the short side edges of the mask body and the short side walls of the mask frame are shifted from the long axis.
Description
The present invention relates to a kind of color cathode ray tube with shadow mask.
Generally, the shell that color cathode ray tube had comprises that periphery is provided with the panel and the Taper Pipe of the essentially rectangular shape of shirt rim, and the inner face of panel is provided with the fluorophor screen of forming by red, blue, green luminous numerous 3 look luminescent coatings respectively.The electron gun of the oriented fluorophor screen of the internal configurations of Taper Pipe neck divergent bundle.And fluorophor screen inboard disposes with this fluorophor shields in accordance with regulations opposed shadow mask at interval.
Above-mentioned color cathode ray tube makes the beam steering of electron gun electrons emitted by arrangement for deflecting, and selects look by shadow mask, by level, the vertical scanning to the fluorophor screen, color display.
Shadow mask comprises: with the shadow mask main body that is formed with the essentially rectangular shape of numerous electron beam through-holes on the fluorophor screen opposed faces; With with the shadow mask frame of the rectangular shape of this shadow mask main body periphery welding, the sidewall welding of plate-shaped frame supporter and shadow mask frame.And shadow mask is by the framework supporter being stuck in the pin place that the panel shirt rim is provided with, being supported by the panel inboard.
Shadow mask main body adopts 1 or multiple spot and shadow mask frame welding near each bight of shadow mask frame and each the bar side central authorities mostly with respect to the assembly structure of shadow mask frame.
And shadow mask is to be supported by near the banded framework supporter of the welding shadow mask frame side substantial middle with respect to the supporting structure of panel.Generally, this shadow mask and supporting structure thereof are the welding points that shadow mask main body and shadow mask frame are avoided shadow mask frame and shadow mask supporter, block a side position welding departing from framework supporter pin slightly.
On the other hand, in the color cathode ray tube, the electron beam that is incident to the fluorophor screen in the middle of the electron beam of electron gun radiation accounts for below 30% of integral body, and most of electron beam in addition then collides with shadow mask.And electron beam kinetic energy is converted into heat energy, to shadow mask and the heating of framework supporter.Shadow mask thermal expansion owing to this heating leans on the relative position relation of the same 3 look luminescent coatings of beam spot of shadow mask shaping just to be offset, and specifically, the landing error of electron beam with respect to luminescent coating takes place, therefore, and the colorimetric purity variation.
This electron beam landing screen error comprises: the color cathode ray tube work initial stage that begins is mainly heated the landing error that thermal expansion produces because of shadow mask main body; Heated when working long hours with color cathode ray tube, the heat transferred of shadow mask main body is to shadow mask frame or framework supporter, the landing error (long-time purity drift) that is produced because of shadow mask frame or the thermal expansion of framework supporter.
In order to alleviate the landing error that this shadow mask thermal expansion is caused, be invar (iron-nickel alloy) formation shadow mask main body with low thermal coefficient of expansion, replace the shadow mask main body that common mild steel is made.This occasion, the thermal expansion of shadow mask main body itself can suppress lessly.
But shadow mask frame and framework supporter generation thermal expansion occasion when working long hours, just about producing that shadow mask main body is local and taking place, about, asymmetric direction displacement such as direction of rotation, occur electron beam with respect to 3 look luminescent coatings screen about, about, this phenomenon of skew on the asymmetric direction such as direction of rotation.
Specifically, its thermal expansion of the shadow mask main body of heating is thermal expansion symmetrically on radiation direction in unassembled shadow mask frame occasion, thereby, on principle, about can not taking place, about, the skew of asymmetric direction such as direction of rotation.For this thinking, can infer, above-mentioned about, about, the skew of asymmetric direction such as direction of rotation is that shadow mask frame causes with respect to the assembly structure of shadow mask main body and the supporting structure of shadow mask.
Here, if shadow mask main body is made by the low-thermal-expansion invar, shadow mask frame is made by mild steel, and the shadow mask that the framework supporter is made by stainless steel takes in, the thermal expansion of this shadow mask main body with regard to little to being about 1/10 of shadow mask frame thermal expansion.Therefore, in case this shadow mask thermal expansion, shadow mask main body just stretches laterally because of the thermal expansion of shadow mask frame, but the thermal expansion of this shadow mask frame absorbed by the shirt rim of shadow mask main body, brings influence in fact for the effective portion of shadow mask main body.
But along with the thermal expansion of shadow mask frame, the shadow mask main body welding point that for example is positioned at the shadow mask frame minor face upward moves at above-below direction (Y direction), and therefore, shadow mask main body minor face periphery is at the above-below direction top offset.Equally, the long limit periphery of shadow mask main body is along with the thermal expansion of shadow mask frame, at left and right directions (X-direction) top offset.And the edge of shadow mask main body is owing to these skews of direction up and down, on the whole at the direction of rotation top offset.
Thereby, above-mentioned color cathode ray tube, electron beam with respect to 3 look luminescent coatings screen about the screen, about, be offset the white uniformity variation on the asymmetric direction such as direction of rotation.
In the middle of above-mentioned shadow mask frame and the thermal expansion of shadow mask supporter, beam spot is along with the colorimetric purity variation that is caused is moved in the thermal expansion of shadow mask frame to the screen peripheral direction, suppose that used is the high brightness state, can in advance electron beam be adjusted to Zhou Fangxiang in the screen by the adjusting stage of dispatching from the factory at color cathode ray tube, carry out inhibition to a certain degree.But the colorimetric purity variation that the effect of shadow mask supporter is caused during high brightness, because in the adjustment process of dispatching from the factory, can't on the color cathode ray tube structure, adjust, thereby can't suppress direction of rotation colorimetric purity variation by adjusting in advance to the electron beam direction of rotation.
The present invention will address the above problem just, and its purpose is to provide a kind of landing error that alleviates the electron beam that caused because of shadow mask frame and the thermal expansion of framework supporter with respect to luminescent coating, improves the color cathode ray tube of colorimetric purity.
In order to achieve the above object, color cathode ray tube of the present invention comprises:
One panel, comprise allow tubular axis by, have effective portion that the major axis of mutually orthogonal and minor axis and inner face are provided with the essentially rectangular shape of fluorophor screen; With the shirt rim of the essentially rectangular shape that is provided with along above-mentioned effective portion lateral margin, above-mentioned shirt rim has respectively 4 sidewalls that extend in parallel with above-mentioned major axis and minor axis,
Be fixed in above-mentioned shirt rim, lay respectively at a plurality of pins on above-mentioned major axis and the minor axis,
One shadow mask, comprise the shadow mask main body and the shadow mask frame that is fixed in the essentially rectangular shape at shadow mask main body edge that shield opposed essentially rectangular shape with above-mentioned fluorophor, above-mentioned shadow mask main body has and above-mentioned panel major axis and the corresponding major axis of minor axis and minor axis and a pair of long limit parallel with above-mentioned major axis and the pair of short edges parallel with above-mentioned minor axis, above-mentioned shadow mask frame has respectively and connects with the long fusing of margin of above-mentioned shadow mask main body, the opposed a pair of long sidewall of almost parallel, respectively with the welding of shadow mask main body minor face, the opposed a pair of short sidewall of almost parallel
A plurality of shadow mask supporters, be located at least 3 sidewalls of above-mentioned shadow mask frame, support above-mentioned shadow mask to make it relative with above-mentioned panel, each shadow mask supporter has and the fixed part of above-mentioned shadow mask frame welding and the holding section that engages with corresponding above-mentioned pin, and along above-mentioned shadow mask frame sidewall longitudinal extension.
The long limit of above-mentioned shadow mask main body and the posetionof weld of the long sidewall of shadow mask frame and above-mentioned minor axis stagger, and the posetionof weld and the above-mentioned major axis of the short sidewall of the minor face of above-mentioned shadow mask main body and shadow mask frame stagger,
And, set the posetionof weld of above-mentioned shadow mask supporter and shadow mask frame and the posetionof weld of above-mentioned shadow mask frame and shadow mask main body, make the thermal expansion amount of the length direction of above-mentioned shadow mask frame along the posetionof weld of above-mentioned each shadow mask supporter and shadow mask frame to above-mentioned pin center, with the posetionof weld of above-mentioned shadow mask supporter and shadow mask frame extremely above-mentioned shadow mask frame and above-mentioned shadow mask main body posetionof weld the thermal expansion amount of part on above-mentioned length direction equidirectional about equally.
And, according to the present invention, make that above-mentioned shadow mask frame thermal coefficient of expansion is α F, the thermal coefficient of expansion of each shadow mask supporter is α H, in each long sidewall of shadow mask frame and the short sidewall and the posetionof weld of above-mentioned shadow mask main body with and the posetionof weld of above-mentioned shadow mask supporter between distance be LF, the posetionof weld of above-mentioned each shadow mask supporter and above-mentioned shadow mask frame is LH with distance between the pin central shaft, then has following relation to set up
LF/LH＝(0.75～1.00)×αH/αF
According to the color cathode ray tube that constitutes as mentioned above, the posetionof weld and the above-mentioned minor axis of long limit of shadow mask main body and the long sidewall of shadow mask frame stagger, and the posetionof weld and the above-mentioned major axis of the short sidewall of above-mentioned shadow mask main body minor face and shadow mask frame stagger simultaneously.By like this posetionof weld being staggered with major axis or minor axis, in the middle of each sidewall of shadow mask frame and each limit of shadow mask main body, the posetionof weld two side portions is the length difference just, and therefore, the deflection that thermal expansion caused is also different.
On the other hand, shadow mask main body is compared with shadow mask frame, and thermal coefficient of expansion is less, so when shadow mask frame and the thermal expansion of shadow mask supporter, presenting with the posetionof weld with shadow mask frame during the shadow mask main body distortion is the center rotation, or moves on to the angular direction.Offset the direction that shadow mask frame moves under the effect of shadow mask supporter by this moving direction is taken as, just can remain on the fixed position shadow mask main body is actual, just can reduce electron beam landing screen error, manage to make the colorimetric purity raising.
And, thermal coefficient of expansion according to shadow mask frame and shadow mask supporter, make the posetionof weld of shadow mask frame with each limit of shadow mask main body, with respect to the major axis and the minor axis of shadow mask, suitably be offset to relative side of shadow mask frame or shadow mask frame and shadow mask supporter posetionof weld one side with shadow mask supporter posetionof weld.So peculiar the screen that is occurred in the time of can utilizing the shadow mask supporter that is assemblied on the shadow mask frame sidewall to offset to support shadow mask changes, and obtains the color cathode ray tube that a kind of colorimetric purity improves.
Fig. 1 to Fig. 7 B illustrates the first embodiment of the invention color cathode ray tube.
Fig. 1 is the profile of above-mentioned color cathode ray tube.
Fig. 2 is the oblique view of shadow mask.
Fig. 3 is the side view that an above-mentioned shadow mask part is shown.
Fig. 4 is the profile of above-mentioned color cathode ray tube face of expression and shadow mask confined state.
Fig. 5 A is the key diagram of shadow mask frame, shadow mask main body and the shadow mask supporter posetionof weld relation of above-mentioned shadow mask.
Fig. 5 B is the key diagram of posetionof weld relation when adopting shadow mask frame different with Fig. 5 A thermal coefficient of expansion and shadow mask supporter.
The profile of shadow mask frame, shadow mask main body and shadow mask supporter state when Fig. 6 is expression shadow mask frame, the thermal expansion of shadow mask supporter.
Fig. 7 A represents shadow mask frame and the shadow mask supporter difference side view of heat expands state longitudinally.
Fig. 7 B is shadow mask supporter state is pushed in expression because of the shadow mask frame thermal expansion a plane graph.
Fig. 8 is the profile of expression second embodiment of the invention shadow mask for color cathode-ray tube and shadow mask supporter configuration relation.
The profile of shadow mask frame, shadow mask main body and shadow mask supporter state when Fig. 9 is the expression second embodiment shadow mask frame, the thermal expansion of shadow mask supporter.
Figure 10 is the profile of shadow mask and shadow mask supporter configuration relation in the expression third embodiment of the invention color cathode ray tube.
Below present invention will be described in detail with reference to the accompanying embodiment color cathode ray tube.
As shown in Figure 1, color cathode ray tube has vacuum envelope 10.This vacuum envelope 10 comprises: the panel 22 that comprises the essentially rectangular shape of effective portion 20 of curved surface composition and the shirt rim 21 that effective portion periphery erects; The Taper Pipe 24 that one end constitutes cylindric neck 23 and docks with the shirt rim.The inner face of panel 22 effective portions 20 is provided with the fluorophor screen of forming by luminous respectively a plurality of luminescent coatings of red, green, blue and landfill light absorbing zone therebetween 25.And, shield 25 opposed and dispose shadow mask 26 with fluorophor in the vacuum envelope 10 at a distance of predetermined distance.
In Taper Pipe 24 necks 23, towards the electron gun 29 of fluorophor screen 25 configuration divergent bundle 28B, 28G, 28R.The periphery of Taper Pipe 24 is being adorned the deflecting coil 30 that makes the electron beam deflecting.
Color cathode ray tube makes electron gun electrons emitted bundle 28B, 28G, 28R deflection by the magnetic field that utilizes arrangement for deflecting 30 to produce, through shadow mask 26 levels, vertical scanning fluorophor screen 25, color display.
As shown in Figures 1 to 4, shadow mask 26 comprises the shadow mask main body 34 of essentially rectangular shape and the shadow mask frame 36 of the rectangular shape of this shadow mask main body of assembling.Shadow mask main body 34 has one and is provided with numerous electron beam through-holes and by shielding significant surface 32 that 25 opposed curved surfaces constitute and the shirt rim 33 of being located at significant surface 32 edges with fluorophor.Shadow mask frame 36 has the sidewall 35 with shadow mask main body 34 shirt rims, 33 weldings, forms L font section.Shadow mask main body 34 is formed by low thermal expansion materials such as invar, and shadow mask frame 36 is made of iron materials such as cold-rolled steel sheets.
Shadow mask main body 34 has center C that color cathode ray tube tubular axis Z passes through and trunnion axis X and vertical axis Y by this center C and mutually orthogonal.And shirt rim 33 has a pair of long limit 16a parallel with trunnion axis X and the pair of short edges 16b parallel with vertical axis Y.Shadow mask framework 36 then forms and comprises a pair of long sidewall 17a parallel with trunnion axis X and a pair of short sidewall 17b parallel with vertical axis Y in interior essentially rectangular shape.
This shadow mask 26 is supported on the panel 22 by 4 approach screws on the limit.Specifically, panel 22 has trunnion axis X and the vertical axis Y corresponding with shadow mask 26 trunnion axis and vertical axis, and shirt rim 21 has a pair of long sidewall parallel with trunnion axis and a pair of short sidewall parallel with vertical axis.And these long sidewalls and short sidewall pars intermedia separately erect and are provided with pin 38, lay respectively at that trunnion axis X goes up and vertical axis Y on.
The long sidewall 17a of shadow mask frame 36 and short sidewall 17b welding respectively are fixed with shadow mask supporter 39, and by these shadow mask supporters are engaged with corresponding pin 38, shadow mask 26 is supported by panel 22.Each shadow mask supporter 39 is bent to form elongated rectangular slab, have with the fixed part 18a of shadow mask frame 36 sidewall weldings, the holding section 18b that engages with pin 38 and between them the rake 18c of diagonally extending, along the sidewall continuity of shadow mask frame.
In the present embodiment, 4 shadow mask supporters 39 rotate the symmetry location with respect to the center C of shadow mask main body 34 shadow mask supporter 39 are set as shown in Figure 4.Specifically, shadow mask supporter 39 is configured to each shadow mask supporter because of the identical direction of rotation that act as that thermal expansion produced, and for example fixes along the dextrorotation direction with respect to shadow mask frame 36.
As shown in Figure 3 and Figure 4, shadow mask main body 34 and shadow mask frame 36 both, by with the bight welding corresponding of 33 each bights, shirt rim with shadow mask frame, and respectively that the long limit 16a of shirt rim and each pars intermedia of minor face 16b is corresponding with shadow mask frame long sidewall 17a and short sidewall 17b respectively welding connect.And long limit 16a and the posetionof weld 41a of long sidewall 17a are positioned at the position of staggering with vertical axis Y, and minor face 16b is positioned at the position of staggering with trunnion axis X with the posetionof weld 41b of short sidewall 17b simultaneously.
Posetionof weld 41a, 41b are different with the material of shadow mask frame 36 and shadow mask supporter 39 with respect to the skew of trunnion axis X and vertical axis Y.Specifically, shadow mask supporter 39 thermal coefficient of expansions are than the big occasion of shadow mask frame 36 thermal coefficient of expansions, shown in Fig. 5 A, posetionof weld 41a, 41b are set to respect to vertical axis Y or trunnion axis X, are offset to a relative side of shadow mask supporter 39 and shadow mask frame 36 posetionof welds 43.Otherwise shadow mask supporter 39 thermal coefficient of expansions are than the little occasion of shadow mask frame 36 thermal coefficient of expansions, and shown in Fig. 5 B, posetionof weld 41a, 41b are set to be offset to posetionof weld 43 1 sides with respect to vertical axis Y or trunnion axis X.
Specifically, set shadow mask supporter 39 and the posetionof weld 43 of shadow mask 36 and posetionof weld 41a, the 41b of shadow mask frame 36 and shadow mask main body 34, so that when color cathode ray tube works long hours, shadow mask supporter 39 and the posetionof weld 43 of shadow mask frame 36 thermal expansion amount to the length direction at pin 38 centers with posetionof weld 41a, the 41b of shadow mask frame and shadow mask main body 34 to the thermal expansion amount on above-mentioned length direction equidirectional between the posetionof weld 43 about equally.
In other words, make that shadow mask frame 36 thermal coefficient of expansions are α F, shadow mask supporter 39 thermal coefficient of expansions are α H, posetionof weld 41a, the 41b of shadow mask frame 36 and shadow mask main body 34 to the distance of shadow mask frame 36 and shadow mask supporter 39 posetionof welds 43 be LF, posetionof weld 43 to the distance of pin 38 central shafts is LH, and then shadow mask main body 34 long limits and minor face are set at the position of satisfying following relation respectively with posetionof weld 41a, the 41b of shadow mask frame 36.
LF/LH＝(0.75～1.00)×αH/αF
For example, shadow mask frame 36 is made by iron material, when shadow mask supporter 39 is made by the spring material of stainless steel series, then has following relation to set up.
LF＝(1.15～1.45)×LH
And shadow mask frame 36 is made by iron material, when shadow mask supporter 39 is made by the bimetallic material, then has following relation to set up.
LF＝(0.90～1.15)×LH
According to the color cathode ray tube that constitutes as mentioned above, when working long hours, peculiar the screen that can reduce that shadow mask main body 34, shadow mask frame 36 and shadow mask supporter 39 heat respectively, occurs during thermal expansion changes, that is to say that the rotation composition in the time of can reducing to comprise 4 shadow mask supporters 39 of rotation symmetry assembling changes at interior screen.
Specifically, if as shown in Figure 6 on shadow mask frame 36 long sidewall 17a and short sidewall 17b the rotation symmetry assemble shadow mask supporter 39 words, when shadow mask main body 34, shadow mask frame 36 and shadow mask supporter 39 heat respectively, shadow mask supporter 39 is the vertical thermal expansion of fixing point with pin 38 just, makes shadow mask frame 36 rotations by arrow 45 directions.This is mainly caused by following 2 aspect reasons.
The firstth, shown in Fig. 7 A by shadow mask supporter 39 and shadow mask frame 36 thermal expansion difference caused, amount of movement that shadow mask frame 36 side wall portions move on level or vertical axis and elasticity support are because of the thermal expansion length variations, just move on level or vertical axis the fixing point position, thereby produce direction and the parallel component of shadow mask frame 36 each side wall portions.The secondth, shown in Fig. 7 B, shadow mask frame 36 moves on radiation direction because of thermal expansion, makes each shadow mask supporter 39 push to the shirt rim of panel 22 21 1 sides, so each shadow mask supporter is out of shape on bearing of trend and is caused.Produce the component of direction and shadow mask frame 36 each parallel sidewalls thus.
And because of these two kinds of component produce the rotation composition of shadow mask frames 36, shadow mask 26 rotates around center C.In addition, dotted line illustrates state after the thermal expansion respectively among Fig. 7 A, the 7B.
In addition, as shown in Figure 6, shadow mask frame 36 is owing to its overall thermal expands, thereby posetionof weld 41a, the 41b of shadow mask main body 34 and shadow mask frame 36 each sidewalls just move to the direction that departs from shadow mask 26 trunnion axis X, vertical axis Y respectively.On the other hand, from shadow mask main body 34 1 sides, the shadow mask main body 34 that low thermal expansion material is made is slightly smaller slightly with moving in shadow mask frame 36 1 sides of posetionof weld 41a, the 41b of shadow mask frame 36.Therefore, shadow mask main body 34 since with the thermal expansion difference of shadow mask frame 36, be subjected to the sort of power of rotation on arrow 46 directions.
At this moment, shadow mask main body 34 plays and above-mentioned power opposite effect in the welding in bight with shadow mask frame 36, but with regard to the absolute value of power, the power that shadow mask main body 34 rotates on arrow 46 directions is bigger, as a result, shadow mask main body 34 in shadow mask frame 36 along swing offset on the swing offset rightabout of arrow 45 directions that caused with 39 thermal expansions of shadow mask supporter.
In addition, be just to rotate the structure of assembling 4 shadow mask supporters 39 symmetrically to describe in the foregoing description, but these shadow mask supporters 39 also can be pressed the assembling of minute surface symmetry with respect to shadow mask 26 trunnion axis X and vertical axis Y as shown in Figure 8 with respect to shadow mask frame 36.
In this structure, the relation between the posetionof weld 43 of posetionof weld 41a, the 41b of shadow mask frame 36 and shadow mask main body 34 and shadow mask frame 36 and shadow mask supporter 39, also identical with previous embodiment, be set at and satisfy following relation
LF/LH＝(0.75～1.00)×αH/αF
In addition, other formation is same as the previously described embodiments, adds identically with reference to label for same section, omits its detailed description.
As mentioned above in the color cathode ray tube of 4 shadow mask supporter 39 minute surface balanced configurations, when heating shadow mask main body 34, shadow mask frame 36 and shadow mask supporter 39 respectively, as shown in Figure 9, shadow mask supporter 39 is fixing point thermal expansion longitudinally with pin 38, make shadow mask frame 36 and shadow mask main body 34 to shown in the arrow 48 to the angular direction displacement.Therefore, occur having level and vertical component screen change.
But according to present embodiment, the posetionof weld 43 of posetionof weld 41a, the 41b by setting shadow mask frame 36 and shadow mask main body 34 each limit as mentioned above, shadow mask frame 36 and shadow mask supporter 39, shadow mask main body 34 are arrow 49 direction top offsets what cause with 39 thermal expansions of shadow mask supporter to angular direction displacement rightabout in shadow mask frame 36.Thus, can accomplish to eliminate 34 pairs of angular direction displacements of shadow mask main body, shadow mask 26 does not move with respect to panel 22 on apparent.So, even if 4 shadow mask supporters 39 with respect to the trunnion axis X of shadow mask 26 and the occasions of vertical axis Y minute surface symmetry assembling, also can reduce to have level, vertical composition screen change, can prevent the colorimetric purity variation.
In sum, color cathode ray tube according to above-mentioned formation, no matter be 4 shadow mask supporters, 39 rotation symmetry assembling occasions, still 4 shadow mask supporter 39 minute surfaces symmetries are assembled occasions, the electron beam landing screen error that thermal expansion causes can be reduced, thereby the image of colorimetric purity excellence can be obtained.
Below specify by example.
(embodiment 1)
As shown in Figure 4, illustrate that 4 shadow mask supporters 39 are fixed on shadow mask frame 36 long sidewall 17a and the occasion of lacking on the sidewall 17b with respect to the center C of shadow mask main body 34 as the rotation symmetry.
Shadow mask main body 34 is by thermalexpansioncoefficient M=0.1 * 10
-5About the invar material make, shadow mask frame 36 is by thermalexpansioncoefficient F=1.2 * 10
-5About iron material make, shadow mask supporter 39 is by thermalexpansioncoefficient H=1.7 * 10
-5About stainless steel series spring material make, the posetionof weld 43 that makes each shadow mask supporter 39 and shadow mask frame 36 to the length (distance L H) of pin 38 central shafts is 40mm.And shadow mask frame 36 is set at respect to trunnion axis X and vertical axis Y with posetionof weld 41a, the 41b on shadow mask main body 34 each limit and leans on shadow mask supporter 39 and the position of shadow mask frame 36 posetionof welds 43 relative lateral deviations from 10mm.
Generally, the temperature t F of shadow mask frame 36 was 30～50 ℃ when color cathode ray tube worked long hours, the temperature t H of shadow mask supporter 39 be its about 75～100%.Here, the temperature of shadow mask frame 36 is 40 ℃ when making color cathode ray tube work long hours, and the temperature of shadow mask supporter 39 is 35 ℃, and then shadow mask supporter 39 thermal expansion amount Δ H are
ΔH＝40mm×35℃×1.7×10
-5＝23.8μm
On the other hand, the posetionof weld 43 of shadow mask frame 36 and shadow mask supporter 39 to the portion of hot swell increment Δ F of trunnion axis X or vertical axis Y is
ΔF＝40mm×40℃×1.2×10
-5＝19.2μm
So, at this moment the position of shadow mask frame 36 on trunnion axis X and vertical axis Y just as shown in Figure 6, swing offset on arrow 45 directions
ΔH-ΔF＝23.8μm-19.2μm＝4.6μm
That is to say that if the posetionof weld of shadow mask frame 36 with shadow mask main body 34 each limit is set on trunnion axis X and the vertical axis Y, shadow mask main body 34 is subjected to the influence of shadow mask frame swing offset, and swing offset 4.6 μ m.
But as present embodiment 1, if with posetionof weld 41a, the 41b on shadow mask frame 36 and shadow mask main body 34 each limit with respect to the trunnion axis X of shadow mask 26 and vertical axis Y by the posetionof weld 43 relative lateral deviations of shadow mask frame 36 and shadow mask supporter 39 from 10mm, make that posetionof weld 43 is 50mm to the distance L F of posetionof weld 41a, 41b, then trunnion axis or vertical axis are to portion of hot expansion 10mm * 40 ℃ * 1.2 * 10 of posetionof weld 41a, the 41b of shadow mask frame 36
-5=4.8 μ m.
At this moment, by thermal coefficient of expansion with respect to the shadow mask frame 36 little shadow mask main bodies of making to 1/10 invar material 34, along with moving of posetionof weld 41a, the 41b of shadow mask frame 36 and shadow mask main body 34, on shadow mask frame 36 direction of rotation rightabouts, rotate 4.8 μ m, offset the swing offset of above-mentioned shadow mask frame 36.Thus, shadow mask main body 34, shadow mask frame 36 and shadow mask supporter 39 heats respectively, thermal expansion produced that screen changes when reducing color cathode ray tube and working long hours prevent the colorimetric purity variation.
If the relation of shadow mask main body 34, shadow mask frame 36 and shadow mask supporter 39 is represented with general formula, then is
LF×tF×αF＝LH×tH×αH
＝LH×(0.75～1.00)tH×αH
Promptly
LF/LH＝(0.75～1.00)αH/αF
And shadow mask frame 36 is iron material (α F=1.2 * 10
-5About), shadow mask supporter 39 is stainless steel series spring material (α H=1.7 * 10
-5About), then set up according to following formula
LF＝(1.15～1.45)LH
(embodiment 2)
Illustrate that 4 shadow mask supporters are assemblied in shadow mask frame 36 long sidewalls and the occasion of lacking on the sidewall with respect to shadow mask 26 trunnion axis X and vertical axis Y minute surface symmetry as shown in Figure 8.
Identical with embodiment 1, shadow mask main body 34, shadow mask frame 36 and shadow mask supporter 39 are made of invar material, iron material and stainless steel series spring material respectively, and the posetionof weld 43 of shadow mask supporter 39 and shadow mask frame 36 is set at 40mm to the distance L H of pin 38 central shafts.At this moment, shadow mask frame 36 is set in respect to shadow mask 26 trunnion axis X and vertical axis Y with posetionof weld 41a, the 41b on shadow mask main body 34 each limit and leans on the position of posetionof weld 43 relative lateral deviations of shadow mask supporter 39 and shadow mask frame 36 from 10mm.
Here, the temperature of shadow mask frame 36 is 40 ℃ when making color cathode ray tube work long hours, and the temperature of shadow mask supporter 39 is 35 ℃, and then shadow mask supporter 39 thermal expansion amount Δ H are
ΔH＝40mm×35℃×1.7×10
-5＝23.8μm
On the other hand, the posetionof weld 43 of shadow mask frame 36 and shadow mask supporter 39 to the portion of hot swell increment Δ F of trunnion axis X or vertical axis Y is
ΔF＝40mm×40℃×1.2×10
-5＝19.2μm
The position of shadow mask frame 36 on trunnion axis X and vertical axis Y just shown in the arrow 48 to angular direction peace line direction top offset
ΔH-ΔF＝23.8μm-19.2μm＝4.6μm
At this moment, if lean on posetionof weld 43 relative lateral deviations from 10mm with respect to trunnion axis X and vertical axis Y posetionof weld 41a, the 41b on shadow mask frame 36 and shadow mask main body 34 each limit, portion of hot expansion 10mm * 40 ℃ * 1.2 * 10 of shadow mask frame 36 then from trunnion axis or vertical axis to posetionof weld 41a, 41b
-5=4.8 μ m, make shadow mask frame 36 and shadow mask main body 34 posetionof weld 41a, 41b with arrow 48 rightabouts and with arrow 49 parallel direction top offsets.
So, at this moment by thermal coefficient of expansion with respect to the shadow mask frame 36 little shadow mask main bodies of making to about 1/10 invar material 34, be subjected to the posetionof weld 41a of shadow mask frame 36 and shadow mask main body 34, influence that 41b moves and displacement, shadow mask main body 34, shadow mask frame 36 and 39 thermal expansions of shadow mask supporter are caused when reducing color cathode ray tube and working long hours, and screen changes, and prevents the colorimetric purity variation.
At this moment the relation of shadow mask main body 34, shadow mask frame 36 and shadow mask supporter 39 is represented with general formula, and is then identical with embodiment 1, for
LF/LH＝(0.75～1.00)αH/αF
And shadow mask frame 36 is iron material (α F=1.2 * 10
-5About), shadow mask supporter 39 is stainless steel series spring material (α H=1.7 * 10
-5About), following formula is then set up
LF＝(1.15～1.45)LH
(embodiment 3)
Illustrate that 4 shadow mask supporters 39 are fixed on shadow mask frame 36 long sidewall 17a and the occasion of lacking on the sidewall 17b with respect to shadow mask main body 34 center C as the rotation symmetry as shown in Figure 4.
Shadow mask main body 34 is by thermalexpansioncoefficient M=0.1 * 10
-5About the invar material make, shadow mask frame 36 is by thermalexpansioncoefficient F=1.2 * 10
-5About iron material make, shadow mask supporter 39 is by thermalexpansioncoefficient H=1.3 * 10
-5About the bimetallic material make, the posetionof weld 43 that makes each shadow mask supporter 39 and shadow mask frame 36 to the distance L H of pin 38 central shafts be 40mm.And posetionof weld 41a, the 41b on shadow mask frame 36 and shadow mask main body 34 each limit is set at respect to trunnion axis X and vertical axis Y and leans on the position of posetionof weld 43 1 lateral deviations of shadow mask supporter 39 and shadow mask frame 36 from 2mm.
Here, the temperature of shadow mask frame 36 is 40 ℃ when making color cathode ray tube work long hours, and the temperature of shadow mask supporter 39 is 35 ℃, and then shadow mask supporter 39 thermal expansion amount Δ H are
ΔH＝40mm×35℃×1.3×10
-5＝18.2μm
On the other hand, the posetionof weld 43 of shadow mask frame 36 and shadow mask supporter 39 to the portion of hot swell increment Δ F of trunnion axis X or vertical axis Y is
ΔF＝40mm×40℃×1.2×10
-5＝19.2μm
So, the position swing offset of shadow mask frame 36 on trunnion axis X and vertical axis Y at this moment
ΔH-ΔF＝18.2μm-19.2μm＝-1.0μm
At this moment, if with posetionof weld 41a, the 41b on shadow mask frame 36 and shadow mask main body 34 each limit with respect to the trunnion axis X of shadow mask 26 and vertical axis Y by posetionof weld 43 1 lateral deviations of shadow mask frame 36 and shadow mask supporter 39 from 2mm, then trunnion axis or vertical axis are to portion of hot expansion 2mm * 40 ℃ * 1.2 * 10 of posetionof weld 41a, the 41b of shadow mask frame 36
-5=0.96 μ m.
Thus, shadow mask frame 36 rotates 0.96 μ m with posetionof weld 41a, the 41b of shadow mask main body 34 on shadow mask frame direction of rotation rightabout, offset the swing offset of shadow mask frame 36.So shadow mask main body 34, shadow mask frame 36 and 39 thermal expansions of shadow mask supporter are caused when reducing color cathode ray tube and working long hours, and screen changes, and prevents the colorimetric purity variation.
If at this moment the relation of shadow mask main body 34, shadow mask frame 36 and shadow mask supporter 39 represents with general formula, then with
Embodiment 1 is identical, for
LF/LH＝(0.75～1.00)αH/αF
And shadow mask frame 36 is iron material (α F=1.2 * 10
-5About), shadow mask supporter 39 is spring material (α H=1.3 * 10 of bimetallic material
-5About), then set up according to following formula
LF＝(0.90～1.15)LH
In addition, in the foregoing description, specifically do not limit the welding point number of shadow mask shadow mask frame and shadow mask supporter, but a plurality of somes welding shadow mask frames that vertically depart from the shadow mask supporter and the occasion of shadow mask supporter, mid point with these a plurality of points is the posetionof weld of shadow mask frame and shadow mask supporter, by setting, can obtain required effect to satisfy above-mentioned each relational expression.
In addition, the present invention is not limited to the foregoing description, can carry out all distortion within the scope of the present invention.For example, the number of shadow mask supporter is not limited to 4, can be 3 as shown in figure 10 also.
According to embodiment illustrated in fig. 10,3 shadow mask supporters 39 welding respectively are fixed on shadow mask frame 36 a pair of short sidewall 17b and the long sidewall 17a.Other formation is identical with previous embodiment, adds identically with reference to label for same section, omits its detailed description.
In the present embodiment, by setting the position relation of posetionof weld 41a, the 41b of posetionof weld 43, shadow mask main body 34 each limit and shadow mask frame 36 and the pin 38 of shadow mask supporter and shadow mask frame equally with the foregoing description, specifically, satisfy this relation of LF/LH=(0.75～1.00) α H/ α F by setting, also can reduce the electron beam landing screen error that thermal expansion causes, obtain the color cathode ray tube that colorimetric purity and white uniformity improve.
Claims (8)
1. color cathode ray tube is characterized in that comprising:
One panel, comprise allow tubular axis by, have effective portion that the major axis of mutually orthogonal and minor axis and inner face are provided with the essentially rectangular shape of fluorophor screen; With the shirt rim of the essentially rectangular shape that is provided with along above-mentioned effective portion lateral margin, above-mentioned shirt rim has respectively 4 sidewalls that extend in parallel with above-mentioned major axis and minor axis,
Be fixed in above-mentioned shirt rim, lay respectively at a plurality of pins on above-mentioned major axis and the minor axis,
One shadow mask, comprise the shadow mask main body and the shadow mask frame that is fixed in the essentially rectangular shape at shadow mask main body edge that shield opposed essentially rectangular shape with above-mentioned fluorophor, above-mentioned shadow mask main body has and above-mentioned panel major axis and the corresponding major axis of minor axis and minor axis and a pair of long limit parallel with above-mentioned major axis and the pair of short edges parallel with above-mentioned minor axis, above-mentioned shadow mask frame has respectively and connects with the long fusing of margin of above-mentioned shadow mask main body, the opposed a pair of long sidewall of almost parallel, respectively with the welding of shadow mask main body minor face, the opposed a pair of short sidewall of almost parallel
A plurality of shadow mask supporters, be located at least 3 sidewalls of above-mentioned shadow mask frame, support above-mentioned shadow mask to make it relative with above-mentioned panel, each shadow mask supporter has and the fixed part of above-mentioned shadow mask frame welding and the holding section that engages with corresponding above-mentioned pin, and along above-mentioned shadow mask frame sidewall longitudinal extension
The long limit of above-mentioned shadow mask main body and the posetionof weld of the long sidewall of shadow mask frame and above-mentioned minor axis stagger, and the posetionof weld and the above-mentioned major axis of the short sidewall of the minor face of above-mentioned shadow mask main body and shadow mask frame stagger, and, set the posetionof weld of above-mentioned shadow mask supporter and shadow mask frame and the posetionof weld of above-mentioned shadow mask frame and shadow mask main body, make the thermal expansion amount of the length direction of above-mentioned shadow mask frame along the posetionof weld of above-mentioned each shadow mask supporter and shadow mask frame to above-mentioned pin center, with the posetionof weld of above-mentioned shadow mask supporter and shadow mask frame extremely above-mentioned shadow mask frame and above-mentioned shadow mask main body posetionof weld the thermal expansion amount of part on above-mentioned length direction equidirectional about equally.
2. color cathode ray tube as claimed in claim 1 is characterized in that,
Make that above-mentioned shadow mask frame thermal coefficient of expansion is α F, the thermal coefficient of expansion of each shadow mask supporter is α H, in each long sidewall of shadow mask frame and the short sidewall and the posetionof weld of above-mentioned shadow mask main body with and the posetionof weld of above-mentioned shadow mask supporter between distance be LF, the posetionof weld of above-mentioned each shadow mask supporter and above-mentioned shadow mask frame is LH with distance between the pin central shaft, then has following relation to set up
LF/LH＝(0.75～1.00)×αH/αF。
3. color cathode ray tube as claimed in claim 2 is characterized in that,
Above-mentioned shadow mask frame is formed by iron material, and each shadow mask supporter is formed by the spring material of stainless steel series, then has following relation to set up
LF＝(1.15～1.45)×LH。
4. color cathode ray tube as claimed in claim 2 is characterized in that,
Above-mentioned shadow mask frame is formed by iron material, and above-mentioned each shadow mask supporter is formed by the bimetallic material, then has following relation to set up
LF＝(0.90～1.15)×LH。
5. color cathode ray tube as claimed in claim 1 is characterized in that,
Above-mentioned each shadow mask supporter has the thermal coefficient of expansion bigger than shadow mask frame,
The posetionof weld of long limit of above-mentioned shadow mask main body and the long sidewall of shadow mask frame is with respect to above-mentioned minor axis, be offset to the relative side of above-mentioned shadow mask supporter with the shadow mask frame posetionof weld, and the posetionof weld of the short sidewall of above-mentioned shadow mask main body minor face and shadow mask frame is offset to the relative side with the shadow mask frame posetionof weld of above-mentioned shadow mask supporter with respect to above-mentioned major axis.
6. color cathode ray tube as claimed in claim 1 is characterized in that,
Above-mentioned each shadow mask supporter has the thermal coefficient of expansion littler than shadow mask frame,
The posetionof weld of long limit of above-mentioned shadow mask main body and the long sidewall of shadow mask frame is with respect to above-mentioned minor axis, be offset to above-mentioned shadow mask supporter and shadow mask frame posetionof weld one side, and the posetionof weld of the short sidewall of above-mentioned shadow mask main body minor face and shadow mask frame is offset to above-mentioned shadow mask supporter and shadow mask frame posetionof weld one side with respect to above-mentioned major axis.
7. color cathode ray tube as claimed in claim 1 is characterized in that,
Above-mentioned a plurality of shadow mask supporter is located at respectively on a pair of long sidewall of above-mentioned shadow mask frame and a pair of short sidewall, and is center rotation balanced configuration with above-mentioned tubular axis.
8. color cathode ray tube as claimed in claim 1 is characterized in that,
Above-mentioned a plurality of shadow mask supporter is located at respectively on a pair of long sidewall of above-mentioned shadow mask frame and a pair of short sidewall, and a pair of shadow mask supporter that is provided with on the above-mentioned short sidewall is with respect to above-mentioned minor axis balanced configuration, and a pair of shadow mask supporter that is provided with on the above-mentioned long sidewall is with respect to above-mentioned major axis balanced configuration.
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9129732A JPH10321153A (en) | 1997-05-20 | 1997-05-20 | Color picture tube |
| JP129732/97 | 1997-05-20 | ||
| JP129732/1997 | 1997-05-20 | ||
| JP141349/1997 | 1997-05-30 | ||
| JP9141349A JPH10334821A (en) | 1997-05-30 | 1997-05-30 | Color picture tube |
| JP141349/97 | 1997-05-30 | ||
| JP004782/98 | 1998-01-13 | ||
| JP10004782A JPH11204050A (en) | 1998-01-13 | 1998-01-13 | Color picture tube |
| JP004782/1998 | 1998-01-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1199919A CN1199919A (en) | 1998-11-25 |
| CN1132217C true CN1132217C (en) | 2003-12-24 |
Family
ID=27276457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98109280A Expired - Fee Related CN1132217C (en) | 1997-05-20 | 1998-05-20 | Colour cathode-ray tube |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0880160B1 (en) |
| KR (1) | KR100271710B1 (en) |
| CN (1) | CN1132217C (en) |
| DE (1) | DE69806686T2 (en) |
| MY (1) | MY120743A (en) |
| TW (1) | TW423010B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2420205A1 (en) * | 1978-03-13 | 1979-10-12 | Videocolor Sa | MASK TUBE FOR COLOR TELEVISION |
| JPS59111234A (en) * | 1982-12-14 | 1984-06-27 | Mitsubishi Electric Corp | Color picture tube |
| JPS59141150A (en) * | 1983-01-31 | 1984-08-13 | Mitsubishi Electric Corp | Shadow mask-type color picture tube |
| JP2577361B2 (en) * | 1985-09-25 | 1997-01-29 | 株式会社東芝 | Color picture tube |
| KR100348683B1 (en) * | 1995-09-18 | 2002-10-31 | 가부시끼가이샤 히다치 세이사꾸쇼 | Color cathode ray tube |
-
1998
- 1998-05-11 TW TW087107214A patent/TW423010B/en not_active IP Right Cessation
- 1998-05-14 DE DE69806686T patent/DE69806686T2/en not_active Expired - Fee Related
- 1998-05-14 EP EP98108821A patent/EP0880160B1/en not_active Expired - Lifetime
- 1998-05-19 MY MYPI98002216A patent/MY120743A/en unknown
- 1998-05-20 KR KR1019980019135A patent/KR100271710B1/en not_active IP Right Cessation
- 1998-05-20 CN CN98109280A patent/CN1132217C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| MY120743A (en) | 2005-11-30 |
| EP0880160A2 (en) | 1998-11-25 |
| TW423010B (en) | 2001-02-21 |
| KR19980087384A (en) | 1998-12-05 |
| DE69806686D1 (en) | 2002-08-29 |
| CN1199919A (en) | 1998-11-25 |
| DE69806686T2 (en) | 2003-03-13 |
| EP0880160B1 (en) | 2002-07-24 |
| EP0880160A3 (en) | 1999-02-03 |
| KR100271710B1 (en) | 2000-11-15 |
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