CN1770375A - Cathode ray tube and image display apparatus using the same - Google Patents
Cathode ray tube and image display apparatus using the same Download PDFInfo
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- CN1770375A CN1770375A CN 200510106948 CN200510106948A CN1770375A CN 1770375 A CN1770375 A CN 1770375A CN 200510106948 CN200510106948 CN 200510106948 CN 200510106948 A CN200510106948 A CN 200510106948A CN 1770375 A CN1770375 A CN 1770375A
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Abstract
A cathode-ray tube is provided with at least a panel formed with a phosphor screen thereon, a shadow mask equipped with a plurality of electron beam passing portions and frames. The panel and the frames are attached to be held by an resilient supports is a state the phosphor screen and shadow mask 3 are opposed. The resilient supports are a combination of two or more types having substantially different spring constants.
Description
The application divides an application, and female case application number is 00814687X (international application no is PCT/JP 00/07392), and the applying date is on October 23rd, 2000, and denomination of invention is cathode ray tube and the image display device that uses this cathode ray tube.
Technical field
The present invention relates to cathode ray tube (in this manual hereinafter referred to as color picture tube) and use the image display device of this cathode ray tube, particularly relate to the image display device that elastic support body has the color picture tube of characteristics and uses this color picture tube, this elastic support body is used for being applied with at mask the state framework that lower support has set up of tension force.
Background technology
As shown in Figure 1, color picture tube has periphery and is formed with the panel 52 of sidewall 51 and the shell that is made of the cone part 53 that engages with this panel 52, forms the phosphor screen 54 that is made of R, G, B3 look on the inner face of the effective portion of panel.Dispose shadow mask 55 opposite to each other with this phosphor screen 54, be formed with a lot of electron beam through-holes on this shadow mask.In addition, on the neck 56 of cone part 53, set the electron gun 57 of launching 3 beam electrons bundles, make this 3 beam electrons beam steering owing to be contained in the magnetic field of deflection yoke 80 generations in cone part 53 outsides, by above-mentioned shadow mask 55 levels, vertically in phosphor screen 54 enterprising line scannings, demonstrate coloured image.
At this, recently color picture tube is from the mirroring less of outer light, ornamental good this point, the developing of panel towards the complanation direction, and thereupon, shadow mask 55 also develops to the complanation direction.If shadow mask 55 is set as the plane, only, can not keep its plane with framework 58 supporting shadow masks 55 main bodys.In addition, only support, because outside vibration makes shadow mask 55 produce vibration easily, to the display image generation harmful effect of color picture tube with framework 58.Therefore, shadow mask 55 is applied certain tension force and be erected on the framework 58.
In addition because electron beam impinges upon on the shadow mask 55, the facial disfigurement of shadow mask 55 and produce take doming effect also is set as the plane because of shadow mask 55, special near the both ends of the surface of the left and right sides of picture the displacement of electron beam big.Therefore, set up, when keeping shadow mask 55, the thermal expansion that produces for the bump that absorbs because of electron beam applies in the practicality that approaches elastic limit tension force to greatest extent to shadow mask 55.
In this color picture tube,, must make shadow mask 55 keep the matching relationship of regulation with respect to the 3 look phosphor layers that constitute phosphor screen 54 in order on phosphor screen 54, to demonstrate correct coloured image.One of reason of the matching relationship of destruction shadow mask 55 and phosphor screen 54 is the vibration of shadow mask 55.As mentioned above, though on shadow mask 55, be applied with tension force, only depend on this point to be difficult to suppress fully the vibration of shadow mask 55.The vibration of shadow mask 55 is that the vibration that applies from the outside or impact (for example being located at the vibration of the loud speaker etc. of panel 52 sidepieces) are passed to shadow mask 55 and produce by elastic support body 59, framework 58 by panel 52.Because shadow mask 55 produces vibration, the variable in distance between shadow mask 55 and the phosphor screen 54, the depression dislocation that can produce electron beam.For this reason, wish that the vibration of shadow mask 55 is as far as possible little, and decay at short notice.
In order to suppress the vibration of shadow mask 55, must suppress the vibration of shadow mask 55 itself and the vibration of framework 58.
Suppress the method that shadow mask 55 vibrates itself, according to reports, the example that vibration isolator is set is arranged on the end face of shadow mask 55.Fig. 2 represents an example of vibration isolator.This vibration isolator 61 is the structures with end bent wiry, and sweep is fed, is arranged in the hole 62 of shadow mask 55.But the size of the sort of degree of vibration isolator 61 free vibrations is set in the hole 62 of shadow mask 55 for.When being used for shadow mask 55 vibration, make the part of the energy of shadow mask 55 vibrations make vibration isolator 61 produce vibration, the vibration of shadow mask 55 just decays.Even be provided with the structure of this vibration isolator 61, it also is inadequate that the moving effect of vibration damping is brought into play in the whole zone of shadow mask 55.
In addition, in order to suppress the vibration of framework 58, must add vibrational energy with framework 58 and be transformed into the effect that heat energy etc. for example absorbs (below be referred to as damping effect).Example in the past such as spy open flat 9-293459 communique and disclose, and have reported the method for establishing sliding part on elastic support body 59, suppressing framework 58 vibrations by friction.Fig. 3 represents that the spy opens the structure of the elastic support body that flat 9-293459 communique disclosed.Among Fig. 3, (a) being front view, (b) is the figure of expression side, by having with the fitting portion 65 of the chimeric embedded hole 64 of cylindrical pin 63, being fixed on the fixed part 66 on the framework 58 and the connecting portion 67 that fitting portion 65 and fixed part 66 couple together constituted.Connecting portion 67 on the way is joined together by welding, forms the V glyph shape.Fixed part 66 is provided with wing limit 68, and insert in the logical hole 69 that is located on the fitting portion 65 on this wing limit 68.Along with the vibration of framework, this elastic support body is when the direction of arrow is made expanding-contracting action, slides and play damping effect in wing limit 68 and hole 69.But this elastic support body complex structure is made difficulty, and the cost height is considered from these problems, in fact is difficult to adopt.
And, this shadow mask 55 is being formed in the operation of phosphor screen 54 as photomask, with the photographic printing method, require to load and unload for several times shadow mask 55.Therefore, the elastic support body 59 of the framework 58 keeping setting up shadow mask 55 is installed, loading and unloading easily, and also reproducibility that should loading and unloading is good, can be installed on the same position.
In addition, elastic support body 59 is had the effect that suppresses vibration except requiring it, also require following characteristic.
(1) arch characteristic, cold hot properties are taken in improvement.
(2) guarantee resistance to impact.
So-called above-mentioned (1) to take arch characteristic (phenomenon) be a kind of like this phenomenon, promptly, as mentioned above, mean because the bump of electron beam, the temperature of shadow mask 55 rises, and produce the temperature difference between the panel 52 (being generally glass), make the matching relationship of regulation produce the phenomenon that claims partially owing to constitute the difference of the material coefficient of thermal expansion rate of shadow mask 55 and panel 52.Cold hot properties is the shadow mask 55 that causes of the peripheral temperature environment owing to panel 52 too and the temperature difference of panel 52 makes both location matches relations produce the phenomenon of skew.All be the phenomenon that makes both location matches relation generation skews because of the shadow mask 55 and the temperature difference of panel 52, become the reason of colour cast and color spot.These skews can not absorb fully even apply tension force on shadow mask 55.Therefore, produce under the situation of relative expansion, must dwindle the distance of the panel inner surface of shadow mask 55 and formation phosphor screen 54, absorb both offsets at shadow mask 55.Otherwise, produce under the situation about expanding at panel 52, must enlarge the distance between shadow mask 55 and the panel 52.For this reason, elastic support body 59 must have the function that changes the position of shadow mask 55 according to the panel 52 and the temperature difference of shadow mask 55.
In addition, when transporting the colorful visualization device, sometimes owing to the state of affairs that meets accident (for example goods collapse etc.) is subjected to the impact do not considered under user mode usually.Buckle when making shadow mask 55 produce displacement because this impact can cause the plastic deformation of elastic support body 59 and fitting portion, the location matches between shadow mask and the panel produces skew.Therefore, even must having, elastic support body 59 when being subjected to specific impact (acceleration), do not make shadow mask 55 produce the intensity of displacement yet.
As mentioned above, the structure of wishing to constitute (following it is called frame structure) by framework, shadow mask, elastic support body in the inhibition vibration of shadow mask, take and have comprehensive good characteristic aspect doming effect and cold hot properties, the resistance to impact.
Below, represent one of existing frame structure example.To be representational framework 58 be arranged on the overall pattern of the state on the panel 62 by the elastic support body 59 of band plate-like to Fig. 4 (a), and Fig. 4 (b) is the enlarged drawing of the elastic support body 59 of expression band plate-like.Elastic support body 59 card of band plate-like ends fastener 60 (a) on the cylindrical pin 63 of panel 62, be fixed on fixed part 60 (b) on the framework, and connect connecting portion 60 (c) formation of fastener 60 (a) and fixed part 60 (b).The elastic support body of this band shape is called the TCM type, has the characteristics of excellent impact resistance.And, in order to take, have the bimetal structure that constitutes by different 2 kinds of material α (oblique line part) of thermal expansion and β (non-oblique line part) to taking the countermeasure of doming effect and cold high temperataure phenomena.But there is following problem in this elastic support body 59: during elastic support body 59 itself temperature-resistant, do not bring into play the bimetallic effect, so poor for the responsiveness of the rapid temperature rising of environmental change and shadow mask.In addition, also there is following problems:,, can not use the thermal coefficient of expansion with panel material that the very material for shadow mask of big-difference is arranged so can not take big correction because the temperature variation of elastic support body 59 is little.
Also there is following problem in this frame structure: because the bight 74 of framework 58 is freely, so be easy to generate vibration, elastic support body to the TCM type does not have effectiveness in vibration suppression, therefore in case produce vibration, can not produce goodish attenuating, as a result, shadow mask also produces vibration, image quality is produced harmful effects such as colour cast.
Fig. 5 (a) represents the frame structure of another conventional example.As shown in the drawing, on the madial wall of the across corner of panel 70, establish cylindrical pin 71, end fastener 72 (a) on this cylindrical pin 71, be fixed on the fixed part 72 (b) on the framework and connect connecting portion 72 (c) formation that the V word of fastener 72 (a) and fixed part 72 (b) is opened by card, often this connecting portion 72 (c) is installed in phosphor screen one side.But there is following problem in this structure.
(1) because elastic support body 72 is set,, difficulty is installed on the across corner of panel 70 so the gap between panel 70 and the framework 73 is little.Therefore, framework 73 is assembled into the assembling operation difficulty relatively on the panel 70, because of the damage of elastic support body 72 and cylindrical pin 71, panel 70 reduces rate of finished products.
(2) owing to be arranged on the across corner of panel 70, thus elastic support body 72 can not establish broad, shock-resistant characteristic is poor.
Summary of the invention
The present invention be solve above-described existing problem and provide a kind of anti-external vibration good, taking the also good and color picture tube structure of assembling easily aspect doming effect and cold hot properties, the resistance to impact and adopting the image display device of this color picture tube.
The first string of present patent application, it is a kind of cathode ray tube, this cathode ray tube has the panel that is formed with phosphor screen at least, have several electron beams by portion shadow mask and setting up the framework that keeps this shadow mask under the state of tension force applying, under above-mentioned phosphor screen and shadow mask state in opposite directions, with elastic support body above-mentioned panel of maintenance and said frame are installed, the characteristics of this cathode ray tube are, in fact above-mentioned elastic support body is located at the framework central portion, and near the tension force the above-mentioned shadow mask central portion is greater than the tension force of above-mentioned shadow mask end.
As above-mentioned structure, because in fact elastic support body is located at the central portion of framework, so can improve assembleability and frame support, and because near the tension force of the warp tension ratio end the shadow mask central portion is big, so not only the end of shadow mask but also central portion also have effectiveness in vibration suppression.
Second scheme of present patent application is a kind of cathode ray tube, this cathode ray tube has the panel that is formed with phosphor screen at least, have several electron beams by portion shadow mask and setting up the framework that keeps this shadow mask under the state of tension force being applied with, under above-mentioned phosphor body and shadow mask state in opposite directions, with elastic support body above-mentioned panel of maintenance and said frame are installed, the characteristics of this cathode ray tube are, above-mentioned elastic support body is fixed on the elastic support body holding plate of the substantial middle portion that is located at framework, and near the tension force of the above-mentioned shadow mask of the warp tension ratio end the central portion of above-mentioned shadow mask is big.
According to said structure, because elastic support body is fixed on the elastic support body holding plate of the substantial middle of being located at framework, even so be not positioned between the framework under the conplane situation, by regulating the direction that extends of elastic support body holding plate, also elastic support body can be configured in the same plane, therefore can further bring into play the action effect of above-mentioned the first string.
At this, in above-mentioned first alternative plan, elastic support body is preferably by being fixed on fixed part on the framework, being entrenched in the fitting portion on the cylindrical pin of being located on the panel inside surface of side wall and being connected and fixed portion and the connecting portion of fitting portion constituting.And, the shape that connecting portion preferably roughly is in the shape of the letter V.Because, be set as such structure, good taking be can obtain and characteristic and cold hot properties encircleed.
At this moment, the area of the fixed part of elastic support body is preferably 5cm
2More than.This is because increase the area of fixed part, and the power that is applied on the framework is disperseed, and prevents the shadow mask tension distribution graphic change that the distortion because of framework causes.In order to make this effect more obvious, the ratio of the area of the fixed part of elastic support body and the fixing area of the framework of elastic support body is more preferably greater than 1/25.
In addition, preferably elastic support body has vibration-proof structure.Even this is because the vibration attenuation of shadow mask if the vibration of framework is unattenuated, then should vibration can be propagated the cause of giving shadow mask.
About the spring constant of elastic support body, form porosely if be set as on the connecting portion of elastic support body, the size in hole is adjusted, then under the situation of the size that does not change elastic support body, can change spring constant with comparalive ease.
By elastic support body be applied to power on the framework be preferably heavy above, the 8kg of 1kg heavy below, the spring constant of elastic support body is preferably 0.1kg weight/mm～2.5kg weight/mm.
Be provided with the vibration isolator that damped vibration is used on the shadow mask that sets up, shadow mask has such tension distribution, and promptly the central portion maximum along with reducing towards end face portion, like this, can make the vibration attenuation of whole shadow mask really.At this moment, in order to enlarge the vibration-damping effect of vibration isolator to whole shadow mask, the tension force that the tension force of supposing the shadow mask central portion is T1, end for tension force following, the end is that the tension force of the pars intermedia between T3, central portion and the end is T2, then preferably make the tension distribution of shadow mask satisfy following relation: T1 〉=T2 〉=T3, and T1 〉=1.1 * T3.
In order to improve attenuating, vibration isolator is not preferably with the standing part of shadow mask and be the structure that can move about.
Specifically, vibration isolator is to insert the logical hole that is formed on the shadow mask to constitute, and vibration isolator is wire-shaped parts or endless member preferably.
As the material of shadow mask, even preferably be heated to high temperature, the also little Fe-Ni alloy of creep.
The 3rd scheme of present patent application provides a kind of cathode ray tube, this cathode ray tube has the panel that is formed with phosphor screen at least and has the mask of several electron beams by portion, and keeps the framework of this mask, under above-mentioned phosphor screen and mask state in opposite directions, with several elastic support bodies above-mentioned panel of maintenance and said frame are installed, the characteristics of this cathode ray tube are, above-mentioned several elastic support bodies are actually by different the constituting more than at least 2 kinds of spring constant.
As long as above-mentioned formation, several elastic support bodies are actually by different the constituting more than at least 2 kinds of spring constant, suppress the simple harmonic vibration mode grow of vibration easily, so can suppress frame vibration.
Here, in above-mentioned third party's case, in order to suppress the vibration of mask, preferably as described in first scheme, in fact elastic support body is located at the central part of said frame.
In order to obtain good arch characteristic and the cold hot properties taken, elastic support body is preferably by being fixed on fixed part on the framework, being entrenched in the fitting portion on the cylindrical pin of being located on the panel side wall inner surface and being connected and fixed portion and the connecting portion of fitting portion constituting.The shape that connecting portion preferably roughly is in the shape of the letter V.
In order further to improve the intensity of simple harmonic vibration mode, preferably in opposite directions the spring constant of elastic support body is identical among the elastic support body.
In addition, the area of the fixed part of elastic support body is preferably 5cm
2More than.This is because increase the area of fixed part the power that is applied on the framework to be disperseed, and prevents to make because of frame deformation the cause of the tension distribution curvilinear motion of shadow mask.In order to bring into play this effect more effectively, preferably the area of the fixed part of elastic support body and the ratio of the fixing area of the framework of elastic support body are at least greater than 1/25.
Elastic support body preferably possesses vibration-proof structure.Even this is because the vibration of shadow mask can decay,, then should vibration can propagate the reason of giving shadow mask if the vibration of framework is unattenuated.
About the spring constant of elastic support body, form porosely if be set as on the connecting portion of elastic support body, the size in hole is adjusted, then under the situation of the size that does not change elastic support body, can change spring constant with comparalive ease.
By elastic support body be applied to power on the framework be preferably heavy above, the 8kg of 1kg heavy below, the spring constant of elastic support body is preferably 0.1kg weight/mm～2.5kg weight/mm.
Preferably mask remains on the said frame being applied with to set up under the state of tension force, and in this case, the tension distribution of mask is that near the tension force the central portion is better greater than the tension force of end.This is that shadow mask has such tension distribution because be provided with the vibration isolator that damped vibration is used on the shadow mask that sets up, and promptly the central portion maximum along with reducing towards end face portion, like this, can make the vibration attenuation of whole shadow mask really.At this moment, in order to enlarge the vibration-damping effect of vibration isolator to whole shadow mask, the tension force of supposing the shadow mask central portion is that the tension force of T1, end is that the tension force of the pars intermedia between T3, central portion and the end is T2, make the tension distribution of shadow mask satisfy T1 〉=T2 〉=T3, and the relation of T1 〉=1.1 * T3 is better.
In order to improve attenuating, vibration isolator is not preferably with the standing part of shadow mask and be the structure that can move about.
Specifically, vibration isolator is to insert the logical hole that is formed on the shadow mask to constitute, and preferably vibration isolator is wire-shaped parts or endless member.
As the material of shadow mask, even preferably be heated to high temperature, the also little Fe-Ni alloy of creep.
In above-mentioned three schemes, not only applicable to above-mentioned cathode ray tube, and applicable to the image display device of all TV displaies that on this cathode ray tube, increased electron beam control circuit, housing etc. etc.
The simple declaration of accompanying drawing
Fig. 1 is the profile of the structure of expression color picture tube.
Fig. 2 is the axonometric drawing of expression shadow mask existing color picture tube, that be provided with vibration isolator.
Fig. 3 (a) and (b) are figure that expression has the existing elastic support body of damping effect, and Fig. 3 (a) is a front view, and Fig. 3 (b) is an end view.
Fig. 4 is the structure chart of the existing color picture tube of expression, and Fig. 4 (a) is a front view, and Fig. 4 (b) is an enlarged axonometric map.
Fig. 5 is the structure chart of the existing color picture tube of expression, and Fig. 5 (a) is a front view, and Fig. 5 (b) is an enlarged axonometric map.
Fig. 6 is the axonometric drawing of the 1st kind of mode of expression.
Fig. 7 is the axonometric drawing of the 1st kind of employed elastic support body of mode.
Fig. 8 is the state diagram of an example of the tension distribution of expression shadow mask, and Fig. 8 (a) is the state diagram that the A type distributes, and Fig. 8 (b) is the state diagram that the M type distributes.
Fig. 9 is the state diagram that the tension distribution of expression shadow mask changes.
Figure 10 is the axonometric drawing of a kind of form of expression vibration isolator.
Figure 11 is the axonometric drawing of the another kind of form of expression vibration isolator.
Figure 12 is the figure of expression T1/T3 and vibration damping time relation.
Figure 13 is the figure of the variation of expression elastic support body, and Figure 13 (a) is an axonometric drawing, and Figure 13 (b) is a profile.
Figure 14 is the figure of another variation of expression elastic support body, and Figure 14 (a) is an axonometric drawing, and Figure 14 (b) is a profile.
Figure 15 is the axonometric drawing of the 2nd kind of employed elastic support body of mode.
Figure 16 is the axonometric drawing of the 3rd kind of employed elastic support body of mode.
Figure 17 is the state diagram of the attenuation state of the frame vibration in the 3rd kind of mode of expression.
Figure 18 is the state diagram of the analysis result of representational framework mode of vibration.
The axonometric drawing of the action of the elastic support body when Figure 19 is expression twisting vibration mode.
The profile of the action of the elastic support body when Figure 20 is expression simple harmonic vibration mode.
Figure 21 is the axonometric drawing of the 4th kind of mode of expression.
The best mode that carries out an invention
Below, with accompanying drawing embodiments of the present invention are specifically described.The shadow mask of the color picture tube that below describes is the tabular mask, and the structure of the color picture tube that describes with Fig. 1 also is same structure in following embodiment.
(the 1st kind of mode)
Fig. 6 represents the axonometric drawing of the frame section of embodiment of the present invention 1.Among Fig. 6, symbol 1 is a left and right sides framework, and symbol 2 is frameworks up and down, and shadow mask 3 remains on up and down on the framework 2 setting up under the state that is applied with tension force on the above-below direction (direction of arrow).On the end face portion of the left and right sides of shadow mask 3, be provided with wire-shaped vibration isolator 4, be used to make the vibration attenuation of shadow mask 3.The framework that adopts 29 types to use in the present embodiment, the tension distribution of shadow mask 3 is set at: central portion is 4.3kg weight/mm
2, left and right sides end face portion is 3.4kg weight/mm
2, the pars intermedia between central portion and the end face portion is 3.6kg weight/mm
2Shadow mask 3 uses the 36%Ni-Fe alloy.
At this, for whole zone performance vibration-damping effect at shadow mask 3, shown in Fig. 8 (a), preferably such tension distribution, promptly the central portion of shadow mask the highest, along with the tension distribution that reduces gradually towards the end (distributing) hereinafter referred to as the A type.Reason is shown in Fig. 8 (b), beyond central portion, have in the distribution (distributing) of peak tension hereinafter referred to as the M type, can see the vibration-damping effect that causes because of vibration isolator from the end to the zone (a) that tension force becomes peak value, but little in central portion zone (b) vibration-damping effect.This is to become node and vibrate the cause that the expansion of the vibration-damping effect of vibration isolator is suppressed at the peak tension position because tension force is the parts P of peak value.Under the situation that wrinkle and tension force inequality are arranged on the shadow mask, vibration-damping effect is also little by the same token.
[test]
Regarding above-mentioned shadow mask and framework as CRT estimates.Its result of table 1 expression.The band plate-like elastic support body (hereinafter referred to as the TCM type) of also having put down in writing present use in table 1 reaches at the elastic support body shown in following the 2nd kind of mode.
(table 1)
Evaluating characteristics result (29 type)
| Project | Target | The 1st kind of mode | The 2nd kind of mode | Conventional example (TCM type) | |||
| The result | Judge | The result | Judge | The result | Judge | ||
| Test * 1 loud speaker test * 2 is beaten in vibration | The following no polychrome skew of colour cast 2sec | 1.5sec there is not the polychrome skew | ○ ○ | 1.6sec there is not the polychrome skew | ○ ○ | 1sec does not have the polychrome skew | ○ ○ |
| Cold high temperature | Below 1 μ m/ ℃ | 0.9μm/ ℃ | ○ | 1μm/℃ | ○ | 1.5μm/ ℃ | × |
| Totally take doming effect | Below the 30 μ m | 20～ 30μm | ○ | 28μm | ○ | 40μm | × |
| Fall (shock-resistant) test (35G:40ms) | Framework is provided with below the | 15～ 20μm | ○ | 20μm | ○ | More than the 100 μ m | × |
Table 1 clearly illustrates which project all reaches target, and anti-external vibration is good, take aspect doming effect and cold hot properties, the resistance to impact also good.And because axle is gone up the SP structure, assembling easily, the fraction defective in the panel-mounted operation (also comprising photo-mask process) with framework reduces significantly, is below 1/10.
In addition, existing TCM type is taken arch characteristic, cold hot properties, resistance to impact is insufficient.Therefore, preferably be set as above-mentioned elastic bearing body structure (hereinafter referred to as mechanical type).
[other item]
Area (1) the 1st kind of employed elastic support body 5 of mode, that be fixed on the fixed part 6 on the framework is made as 10cm
2, but be not limited to this value.Wish that this area is bigger, preferably minimum is 5cm
2This is that then because the power that elastic support body 5 is applied on the framework is concentrated, frame deformation as shown in Figure 9, makes the cause of the tension distribution curvilinear motion of shadow mask 3 because if the area of fixed part 6 is little.As mentioned above, if the tension distribution curvilinear motion of shadow mask, then produce the zone that the vibration of shadow mask is difficult to decay, so undesirable.Owing to this reason, wish that area elastic support body 5, that be fixed on the fixed part 6 on the framework is big, preferably minimum is 5cm
2
In (2) the 1st kinds of modes (size of panel is 29 types), as mentioned above, by area elastic support body 5, that be fixed on the fixed part 6 on the framework is set as greater than 5cm
2, can prevent the vibration of shadow mask 3, but this method also can adapt to other big or small panel.In this case, confirmed to be set as area (A1cm by experiment with the fixed part 6 of elastic support body 5
2) with the fixing area (A2cm of the framework of elastic support body 5
2) ratio (A1/A2) greater than 1/25 structure, can obtain same effect.
In (3) the 1st kinds of modes, use the mechanical type elastic support body 5 of spring constant as 1.2kg weight/mm, the power that is applied to when being located at framework on the panel on the framework is about 3.5kg heavily, adapts to mechanical type elastic support body 5 of the present invention and is not limited to this.But, the power on the framework of being applied to be preferably heavy above, the 8kg of 1kg heavy below.Because if heavy less than 1kg, then framework is located at the state labile that is provided with on the mask, on the other hand, if heavy greater than 8kg, then framework produces distortion, and the tension distribution of shadow mask 3 becomes the M type, the cause that vibration is difficult to decay.
So, confirm by experiment, realize that the above-mentioned spring constant that the mechanical type elastic support body 5 of state is set is preferably more than the 0.1kg weight/mm, below the 2.5kg weight/mm.This is because the gap between framework and the panel, in fact maximum limit is 20mm (panel size hour this value is littler), and for realizing the above-mentioned power of setting, spring constant is necessary for more than the 0.1kg weight/mm, in addition, if spring constant is below the 2.5kg weight/mm, the spring rigidity is excessive, is difficult to cause distortion, the assembleability extreme difference, even apply identical power, deflection is also little, so make the cause of taking arch characteristic and cold hot properties reduction (extent of amendment is extremely narrow).
In (4) the 1st kinds of modes, be located at vibration isolator 4 on shadow mask 3 left and right sides end face portion and be the local buckling of wire-shaped parts, insert in the hole 21 that is formed on the shadow mask 3 and constitute, being not limited to this but adapt to vibration isolator 4 of the present invention, for example also can be the such endless member of Figure 10 9.In addition, also can be as shown in figure 11, a part contacts with shadow mask end face 12, and another part is fixed on the vibration isolator 11 on the framework 10.
(5) as the material of shadow mask, the thermal creep amount when wishing under applying the state of tension force high temperature is little.In making the CRT process, must carry out following several high-temperature heat treatment process, be the heat treatment of the stress that reduces when setting up shadow mask to be produced and for fusion (frit) technology that forms shell etc.Shadow mask has tension force and is erected on the framework, and this structure is when carrying out above-mentioned Technology for Heating Processing, and shadow mask then produces phenomenons such as tension force reduces, tension distribution variation, shadow mask wrinkle if produce thermal creep, and this is unfavorable.In addition,, must apply very big tension force,, produce a lot of problems such as frame weight increase, spanning equipment complexity and expense increase, complex process etc. because of frame strength improves to shadow mask in order to absorb thermal creep.Therefore, the material of shadow mask preferably the employed Ni-Fe alloy of present embodiment (invar material etc.), under applying the state of tension force the little material of thermal creep amount during high temperature.
(6) in order on whole shadow mask, to enlarge the attenuating of vibration isolator, the tension force of supposing the shadow mask central portion is T1, and the tension force of end is T3, and the tension force of the pars intermedia between central portion and the end is T2, then preferably make the tension distribution of shadow mask satisfy following relation: T1 〉=T2 〉=T3, and T1 〉=1.1 * T3.This is because as shown in figure 12, when T1＜1.1 * T3, and the cause that the vibration damping time is elongated.Among Figure 12, the so-called vibration damping time means that vibration amplitude reaches the time below 1/10.
(7) shown in Figure 13 (a) and (b), preferably elastic support body be that slip cylindraceous is welded on the fixed part 6 with parts 33 or will be welded on fixed part 6 first-class methods with parts 35 in the band shape slip that cylindrical pin 34 front ends slide as shown in figure 14 and has vibration-proof structure by the section that will slide at cylindrical pin 34 front ends.Even this is that this vibration can be propagated the cause of giving shadow mask because the vibration attenuation of shadow mask is unattenuated as if the vibration of framework.
(the 2nd kind of mode)
Figure 15 represents the axonometric drawing of the frame section of embodiment of the present invention 2.In addition, put on identical symbol, omit its explanation having with the parts of execution mode 1 identical function.
Be located at the elastic support body holding plate 20 of the substantial middle portion of framework 2 up and down (area that elastic support body holding plate 20 is fixed on the framework 2 up and down is 15cm about framework being contained in the setting on the framework 2 up and down of the elastic support body 5 used on the panel, being fixed on
2) on, and the tension distribution on the shadow mask 3 to set central portion for be 4.0kg weight/mm
2, left and right sides end face portion is 3.2kg weight/mm
2, the pars intermedia between central portion and the end face portion is 3.5kg weight/mm
2, in addition, identical with the structure of above-mentioned execution mode 1.
[experiment]
Regarding above-mentioned shadow mask and framework as CRT estimates.It the results are shown in above-mentioned table 1.Identical with the situation of above-mentioned execution mode 1, which all reaches target, and anti-external vibration is good, takes and looks for phenomenon and cold hot properties also good.And, owing to be that axle is gone up the SP structure, assembling easily, the fraction defective that framework is installed in the operation (comprising photo-mask process) on the panel is reduced to below 1/10 significantly.
(other item)
About (1)～(7) of above-mentioned the 1st a kind of mode content, the 2nd kind of mode too, its explanation of Therefore, omited.
(the 3rd kind of mode)
Figure 16 represents the axonometric drawing of the elastic support body of embodiment of the present invention 3.Have with the parts of the 1st kind of mode identical functions and put on identical symbol, omit its explanation.
On framework 2 up and down spring constant being set is 0.2kg weight/mm (L1:50mm, L2:25mm, t:0.3mm) elastic support body, it is 1.2kg weight/mm (L1:50mm that elastic constant is set on left and right sides framework 1, L2:25mm, t:0.6mm) elastic support body is in addition, identical with the structure of above-mentioned the 1st kind of mode.Use this elastic support body, applied force is respectively the 1.2kg weight on framework when being located at framework on the panel, 3.5kg is heavy.
[experiment]
Above frame structure is estimated as CRT.Its result of table 2 expression.
(table 2)
Evaluating characteristics result (29 type)
| Project | Target | The 3rd kind of mode | Conventional example (TCM type) | ||
| The result | Judge | The result | Judge | ||
| Test * 1 loud speaker test * 2 is beaten in vibration | The following no polychrome skew of colour cast 2sec | 0.5sec there is not the polychrome skew | ○ ○ | 1.5sec there is not the polychrome skew | ○ ○ |
| Cold high temperature | Below 1 μ m/ ℃ | 0.9μm/℃ | ○ | 1.5μm/℃ | × |
| Totally take doming effect | Below the 30 μ m | 20～30μm | ○ | 40μm | × |
| Fall (shock-resistant) test (35G:40ms) | Framework is provided with below the | 15～20μm | ○ | More than the 100 μ m | × |
Clearly illustrated that by table 2 which project all reaches target, anti-external vibration is good, takes doming effect and cold hot properties, resistance to impact is also good.Particularly, shown in Figure 17 (b),, also can in less than 0.5 second time, suppress the vibration of framework even on panel, apply the impact of acceleration 3G about vibration.And owing to be that axle is gone up the SP structure, so be easy to assembling, the fraction defective in the operation (also comprising photo-mask process) that framework is installed on the panel is reduced to below 1/10 significantly.
In addition, in the existing TcM type, take arch characteristic, cold hot properties, resistance to impact is insufficient.Therefore, preferably be set as above-mentioned mechanical type.
Therefore, the 3rd kind of mode is effective to suppressing frame vibration, and its principle is described as follows.Mode of vibration at the frame structure of the elastic support body of the substantial middle portion of framework configuration mechanical type is resolved, and as shown in figure 18, (analysis result of Figure 18 is the mode of vibration of the frame structure of 29 profile plates 3 kinds of modes.If the size variation of panel, though the mode of vibration form is identical, the occurrence frequency of mode of vibration changes).
(1) twisting vibration mode: the mode that framework vibrates with reversing (framework that 29 types are used is to produce about 85Hz).
(2) simple harmonic vibration mode: to be located at the elastic support body on the framework up and down or to be located at elastic support body on the framework of the left and right sides is made rotary vibration as fulcrum mode (framework that 29 types are used is to take place about 115Hz and 130Hz).
(3) parallel mode of vibration: framework carries out parallel mobile mode of vibration (framework used of 29 types with 140Hz about take place) along tube axial direction (arrow A direction among the figure).
Loud speaker is set on panel surface, only applies the frequency that produces various mode of vibrations, disconnect loud speaker then, measure the vibration attenuation state when (being called the test of loud speaker single-tone), in the twisting vibration mode, how vibration is proceeded also unattenuatedly.In the simple harmonic vibration mode, compare, can in the time below 1/10, suppress vibration with the twisting vibration mode.In the parallel mode of vibration, be difficult to measure, restrain vibration very soon.
Its reason can consider to be the manner of execution of elastic support body.Under the situation of twisting vibration mode, as shown in figure 19, any elastic support body is that move at the center with cylindrical pin 85 all, and the fitting portion 86 (a) of elastic support body and connecting portion 86 (c) are reversed.When carrying out such action,, continue vibration so frame vibration can not be suppressed because elastic support body does not have effectiveness in vibration suppression.In the simple harmonic vibration mode, the elastic support body and the torsional mode that become fulcrum are done same action, and elastic support body is in addition made expanding-contracting action (making expanding-contracting action along the direction of arrow) as shown in Figure 20.At this moment, on the fitting portion 86 (a) of cylindrical pin 85 and elastic support body, the embedded hole 87 of elastic support body and cylindrical pin 85 produce very little slip.The friction that causes because of the slip of this embedded hole 87 and cylindrical pin 85 plays damping effect, works to suppress frame vibration.In the parallel mode of vibration, all elastic support bodies are made expanding-contracting action, play great damping effect, so can instantaneous inhibition frame vibration.
Be located at left and right sides framework, the elastic support body on the framework often all is identical (shape, spring constant etc.) up and down, in this case, frame vibration produces simple harmonic vibration mode and parallel mode of vibration hardly based on torsional mode.Therefore, can not suppress frame vibration and continue vibration.We find the elastic support body that uses spring constant different can produce 2 kinds of mode of vibrations of twisting vibration mode and simple harmonic vibration mode.
Table 3 be to the spring constant that is located at the elastic support body on the framework up and down be fixed as 0.2kg weight/mm, the spring constant that is located at the elastic support body on the framework of left and right sides torsional mode and the result that studies of the strength ratio of simple harmonic vibration mode when 0.2kg weight/mm is changed to 1.9kg weight/mm.
(table 3)
| Be located at the spring constant of the spring on the framework of the left and right sides | Oscillation intensity (comparing) | |
| Torsional mode | The simple harmonic vibration mode | |
| K:0.2kg weight/ | 5 | 0 |
| K:1.2kg weight/ | 3 | 1.7 |
| K:1.5kg weight/mm | 1 | 0.5 |
| K:1.9kg weight/mm | 0.6 | 0.7 |
The spring constant of the spring about being located on the framework: 0.2kg weight/mm
Intensity shown in this table 3 is that the oscillation intensity of the mensuration system that produced when adding external vibration of facility is 1 o'clock a relative value.By this result as can be known, make the spring constant of the left and right sides framework and the elastic support body of framework up and down different, the effect that the simple harmonic vibration mode suppresses to vibrate is stronger.
Like this,, a part of twisting vibration mode conversion the simple harmonic vibration mode can be become, frame vibration can be suppressed by making the spring constant difference of elastic support body.For improving the intensity of simple harmonic vibration mode, the identical elastic support body about being located on the framework, the elastic support body in opposite directions that is located on the framework of the left and right sides all are identical spring constants, and this is effective.
About the spring constant of elastic support body, if on the connecting portion of elastic support body, form the hole, adjust with the size in hole, then the size of heart change elastic support body can not change spring constant with comparalive ease.
[other item]
(1) of above-mentioned the 1st kind of mode～(7), in the 3rd kind of mode too, its explanation of Therefore, omited.
In (8) the 3rd kinds of modes, elastic support body makes the structure that is directly arranged on the framework, but the present invention is not limited to this, also can be shown in the 2nd kind of mode, and make by the elastic support body holding plate elastic support body is located at structure on the framework.
In (9) the 3rd kinds of modes, in fact elastic support body is located at the central authorities of said frame, but is not limited to this structure.Yet,, preferably in fact elastic support body is located at said frame central authorities in order to suppress the vibration of mask preferably.
(10) for improving the intensity of simple harmonic vibration mode, preferably in opposite directions the spring constant of elastic support body is identical among the elastic support body.
(11) mask is preferably in to set up under the state that is applied with tension force and remains on the said frame, and in this case, the tension distribution of mask is that near the tension force the central portion is better greater than the tension force of end.This is that shadow mask has such tension distribution because be provided with the vibration isolator that damped vibration is used on the shadow mask setting up, and promptly the central portion maximum along with reducing towards end face portion, can make the cause of the vibration attenuation of whole shadow mask really.
(12) the 3rd inventions also applicable to: " setting up the mask of the dull and stereotyped mask that is keeping having several electron beam through-holes along longitudinal and transverse 2 directions of picture ", " along above-below direction set up several slices that keeping being called opening grid (aperture grille) mask ".In addition, shadow mask is not limited to plane, also comprises cylindrical the face that sets up.
(the 4th kind of mode)
The 4th kind of mode of the present invention is to adopt the TV imagescope of the color picture tube of execution mode 1～execution mode 3.Figure 21 is the axonometric drawing of its summary of expression.Among Figure 21, symbol 25 is color picture tubes of the present invention, and symbol 26 is loud speakers, and symbol 27 is the first-class circuit of controlling electron beam and high frequency.Because this structure, the caused colour cast of external vibration is few, and the reliability height aspect the contingency when transporting can be realized plane TV imagescope.
Structure of the present invention is not limited to the TV imagescope, also applicable to all images display unit such as monitors.
The possibility of utilizing on the industry
As mentioned above, according to the present invention, have following excellent results: can provide anti-external vibration good, taking aspect arch characteristic and cold hot properties, the resistance to impact the also color picture tube of the good and structure that is easy to assemble, and can provide the plane that utilizes this color picture tube TV imagescope.
Claims (22)
1. cathode ray tube, this cathode ray tube has the panel that is formed with phosphor screen at least and has the mask of several electron beams by portion, and keeps the framework of this mask, under above-mentioned phosphor screen and mask state in opposite directions, with several elastic support bodies above-mentioned panel of maintenance and said frame are installed, it is characterized in that
Above-mentioned several elastic support bodies are actually by different the constituting more than at least 2 kinds of spring constant.
2. cathode ray tube according to claim 1 is characterized in that,
In fact above-mentioned elastic support body is located at the central part of said frame.
3. cathode ray tube according to claim 1 is characterized in that,
Above-mentioned elastic support body is by being fixed on fixed part on the said frame, being entrenched in the fitting portion on the cylindrical pin on the inner face of being located at above-mentioned panel sidewall and being connected and fixed portion and the connecting portion of fitting portion constituting.
4. cathode ray tube according to claim 3 is characterized in that,
The shape that above-mentioned connecting portion is roughly V-shaped.
5. cathode ray tube according to claim 1 is characterized in that,
In opposite directions the spring constant of elastic support body is identical among the above-mentioned elastic support body.
6. cathode ray tube according to claim 3 is characterized in that, is provided with the hole on the connecting portion of above-mentioned elastic support body, adjusts spring constant with the size in this hole.
7. cathode ray tube according to claim 1 is characterized in that,
When said frame utilizes above-mentioned elastic support body to be arranged on the above-mentioned panel, the power on the said frame of being applied to be defined as heavy above, the 8kg of 1kg heavy below.
8. cathode ray tube according to claim 1 is characterized in that, the spring constant of above-mentioned elastic support body is defined as more than the 0.1kg weight/mm, below the 2.5kg weight/mm.
9. cathode ray tube according to claim 3 is characterized in that,
The area of the fixed part of above-mentioned elastic support body is 5cm
2More than.
10. cathode ray tube according to claim 3 is characterized in that,
The ratio of the area of the fixed part of above-mentioned elastic support body and the area of the said frame of fixing above-mentioned elastic support body is at least greater than 1/25.
11. cathode ray tube according to claim 1 is characterized in that,
Above-mentioned mask remains on the said frame being applied with to set up under the state of tension force.
12. cathode ray tube according to claim 11 is characterized in that,
The tension distribution of above-mentioned mask is that near the tension force of the warp tension ratio end the central portion is big.
13. cathode ray tube according to claim 11 is characterized in that,
If the tension force of mask central portion is T1, the tension force of end is T3, and the tension force of the pars intermedia between central portion and the end is T2, and then the tension distribution of above-mentioned mask satisfies T1 〉=T2 〉=T3, and the relation of T1 〉=1.1 * T3.
14. cathode ray tube according to claim 12 is characterized in that,
If the tension force of mask central portion is T1, the tension force of end is T3, and the tension force of the pars intermedia between central portion and the end is T2, and then the tension distribution of above-mentioned mask satisfies T1 〉=T2 〉=T3, and the relation of T1 〉=1.1 * T3.
15. cathode ray tube according to claim 7 is characterized in that,
On above-mentioned mask, be provided with the vibration isolator that damped vibration is used.
16. cathode ray tube according to claim 15 is characterized in that,
Above-mentioned vibration isolator can move about with respect to above-mentioned mask.
17. cathode ray tube according to claim 16 is characterized in that,
Above-mentioned vibration isolator is inserted in the logical hole that is formed on the above-mentioned mask.
18. cathode ray tube according to claim 17 is characterized in that,
Above-mentioned vibration isolator is the wire-shaped parts.
19. cathode ray tube according to claim 17 is characterized in that,
Above-mentioned vibration isolator is an endless member.
20. cathode ray tube according to claim 1 is characterized in that,
Above-mentioned shadow mask is made of the Fe-Ni alloy.
21. an image display device has described cathode ray tube of claim 1 and electron beam control circuit, housing.
22. image display device according to claim 21 is characterized in that, also has loud speaker.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP299654/99 | 1999-10-21 | ||
| JP29965499 | 1999-10-21 | ||
| JP367205/99 | 1999-12-24 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB00814687XA Division CN100341103C (en) | 1999-10-21 | 2000-10-23 | Cathode-ray tube and image display comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1770375A true CN1770375A (en) | 2006-05-10 |
Family
ID=36751550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510106948 Pending CN1770375A (en) | 1999-10-21 | 2000-10-23 | Cathode ray tube and image display apparatus using the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1770375A (en) |
-
2000
- 2000-10-23 CN CN 200510106948 patent/CN1770375A/en active Pending
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Open date: 20060510 |