JP2004047236A - Color selection electrode thin plate, color selection mechanism, and cathode-ray tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color selection mechanism of a multiple-mask structure increasing restriction/attenuation effect and eliminating mis-alignment of bean transparent holes and to provide a cathode-ray tube having the color selection mechanism. <P>SOLUTION: A plurality of masks 51, 52 each having beam transparent holes 54, 57 at locations corresponding to each other are overlapped with each other. A color selection electrode thin plate 50 in which the overlapped masks 51, 52 are bonded between the end of the beam transparent holes 54, 57 and a welding part 61 toward a frame 46, is bridged and welded on the frame 46 to form the color selection mechanism 34. The cathode-ray tube comprises the color selection mechanism 34. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a color selecting electrode thin plate used for a cathode ray tube, a color selecting mechanism, and a cathode ray tube provided with the color selecting mechanism.
[0002]
[Prior art]
As a color selection mechanism of a color cathode ray tube, for example, a color selection mechanism 1 called an aperture grill as shown in FIG. 5 is known. The color selection mechanism 1 includes a frame-shaped metal frame 6 including a pair of opposed support members 2 and 3 and elasticity imparting members 4 and 5 extending between both ends of the support members 2 and 3. A mask member having a large number of slit-shaped beam transmitting holes 9 in one direction, that is, along the electron beam line scanning direction, that is, a color selecting electrode thin plate 10 is provided between opposed supporting members of the frame 6. It is stretched. The electrode thin plate 10 for color selection is made of a thin metal plate, and has a large number of narrow band-like grid elements 8 arranged at a predetermined pitch in the above-mentioned one direction, and a long slit between each adjacent grid elements 8 in the field direction of the electron beam. The grit element 8 is stretched between the support members 2 and 3 with a predetermined tension by the elasticity imparting members 4 and 5. The frame 6 is provided with a support spring 16 having an engaging hole 15 for engaging a panel pin at an end via a spring holder 14 in order to support the color selection mechanism 1 in the panel of the cathode ray tube.
[0003]
In a color cathode ray tube provided with such a color selection mechanism 1, there is no air resistance because the inside of the tube is a vacuum, and therefore, the color selection mechanism is subjected to an external forced vibration such as an impact or a sound output from a speaker. It is necessary to prevent one electrode thin plate 10 from resonating. That is, the color selection mechanism 1 requires a mechanism for suppressing the vibration of the electrode thin plate 10 or for attenuating the vibration once the vibration starts. As shown in FIG. 5, a well-known method of preventing vibration is a damper wire 11 made of, for example, a very fine steel wire along the arrangement direction of the grid element body 8 so as to contact the surface of the color selecting electrode thin plate 10. Is stretched. The damper wire 11 is stretched between damper springs 12 attached to the elastic members 4 and 5 of the frame 6. However, the damper line 11 creates a shadow on the image while being extremely thin. Further, when the color selecting electrode thin plate 10 vibrates in the normal direction with respect to the contact surface of the damper wire 11, the damping effect by the damper wire 11 is hardly obtained.
[0004]
On the other hand, with the increase in size and definition of color cathode ray tubes, it has been desired to more effectively attenuate the vibration of the grid element of the color selection mechanism. As one of the techniques that have been attracting attention in recent years, a color selection mechanism 21 shown in FIG. 6 (a perspective view of a main part) and FIG. 182983). The color selection mechanism 21 includes two thin steel plates each having a beam transmission hole 22a, 23a and a grid element body 22b, 23b corresponding to each other, that is, a color selection electrode thin plate formed by superposing masks 22 and 23. 24 is welded to the support members 2 and 3 of the frame 6. In the color selection mechanism 21, the two masks 22 and 23 attenuate each other due to the contact resistance between the two masks 22 and 23, thereby obtaining a high attenuation effect. Further, the vibration in the normal direction to the surface of the color selecting electrode thin plate 24 can attenuate by the collision of the masks 22 and 23 with each other. Therefore, the damper line can be omitted, and a good image can be obtained.
[0005]
[Problems to be solved by the invention]
By the way, in the color selection mechanism 21 having the double mask structure shown in FIGS. 6 and 7, the two masks 22 and 23 are welded to the support members 2 and 3 of the frame 6 in a state of being overlapped. After performing the blackening process on the mechanism 21, wrinkles are generated on the color selecting electrode thin plate 24 by the two masks 22 and 23 due to a difference in distribution of stress applied to the respective masks 22 and 23, and the two Adhesion between masks 22 and 23 is impaired. That is, as shown in FIGS. 6 and 8, a connecting portion (a continuous portion where no slit is formed) connecting the grid elements 22 b and 23 b of the masks 22 and 23 constituting the color selecting electrode thin plate 24, that is, the frame 6. A wrinkle 28 is locally generated (for example, in a region L including several grid elements) at a connecting portion 27 between the welded portion 26 to the end of the beam transmitting holes 22a and 23a, A gap 29 is generated between the grid element bodies 22b and 23b of the masks 22 and 23, and the adhesion is impaired.
If the two masks 22 and 23 are in uniform contact over the entire surface including the grid element, a vibration damping / damping effect can be obtained. Can not be obtained.
[0006]
Further, in order to overlap the two masks 22 and 23 and weld them to the frame 6 at the same time, a large amount of welding current is required, and welding pressure corresponding to the current is required. Therefore, the masks 22 and 23 are easily deformed by heat, and the two masks 22 and 23 are easily displaced. If the positions of the beam transmission holes 22a and 23a of the two masks 22 and 23 are not shifted, an appropriate amount of the electron beam B passes as shown in FIG. 9A, but the positions of the two masks 22 and 23 are 9B, an appropriate amount of the electron beam B cannot pass through, as shown in FIG. 9B, causing a problem in luminance and chromaticity on an image.
[0007]
In view of the above, the present invention enhances the vibration-damping / attenuation effect of the color-selecting electrode thin plate, and eliminates the displacement of the beam transmission hole, and provides a highly accurate color-selecting electrode thin plate, a color selecting mechanism, and the like. An object of the present invention is to provide a cathode ray tube having a color selection mechanism.
[0008]
[Means for Solving the Problems]
In the electrode plate for color selection according to the present invention, a plurality of masks provided with beam transmitting holes at positions corresponding to each other are superimposed, and the superimposed mask is formed between the end of the beam transmitting hole and the welded portion to the frame. It is configured to be joined to each other at a position between them.
[0009]
In the color-selecting electrode thin plate of the present invention, a plurality of superposed masks are joined to each other between the end of the beam transmitting hole and the welded portion to the frame. And the distance between them becomes smaller. Therefore, when the electrode plate for color selection is welded to the frame and subjected to blackening, the stress distribution between the plurality of masks in the region between the joint and the end of the beam transmission hole after the blackening treatment. Even if there is a difference, since the above-mentioned distance is small, wrinkles that form a gap between a plurality of masks do not occur. As a result, the plurality of masks are uniformly adhered over the entire surface. Even when a plurality of masks are joined by, for example, welding, the mask is a thin plate, so that a low welding current is sufficient and thermal deformation is avoided.
[0010]
In the color selection mechanism according to the present invention, a plurality of masks each having a beam transmission hole provided at a position corresponding to each other are overlapped, and the overlapped mask is placed between an end of the beam transmission hole and a welded portion to a frame in advance. The electrode plate for color selection which is joined at the position of the above is provided, and the electrode plate for color selection is stretched on a frame and welded.
[0011]
In the color selection mechanism of the present invention, there is provided a color selection electrode thin plate in which a plurality of superimposed masks are joined in advance at a position between an end of the beam transmission hole and a welded portion to the frame. Since the selection electrode plate is welded on the frame, the entire mask is uniformly adhered between the plurality of masks, and the color selection electrode plate can be satisfactorily controlled and attenuated even when subjected to external vibration.
[0012]
In the cathode ray tube according to the present invention, a plurality of masks provided with beam transmitting holes at positions corresponding to each other are superimposed, and the superimposed mask is previously disposed between the end of the beam transmitting hole and the welded portion to the frame. It has a color-selecting electrode thin plate which is joined at a position, and has a color-selecting mechanism which is formed by stretching and welding the color-selecting electrode thin plate on a frame.
[0013]
In the cathode ray tube of the present invention, since the color selection mechanism has the above-described structure, the color selection electrode thin plates including a plurality of masks are uniformly adhered to each other over the entire surface, so that the color selection electrode thin plates can be controlled even when subjected to external vibration. Vibration and attenuation are satisfactorily performed, and the image quality is not impaired.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, description will be made with reference to the drawings.
[0015]
FIG. 1 shows an embodiment of a color cathode ray tube according to the present invention.
The color cathode-ray tube 31 according to the present embodiment has red (R), green (G), and blue (B) phosphor layers, for example, each color, on an inner surface of a panel 32P of a cathode-ray tube (eg, a glass tube) 32. A color phosphor screen 33 composed of a phosphor stripe is formed, a color selection mechanism 34 according to the present invention described later is arranged opposite to the phosphor screen 33, and an electron gun 35 is arranged in the neck 32N. On the outside of the tube 3, the colors of the electron beam B _R from the electron gun _35, B _G, the deflection yoke 36 for deflecting the B _B in the line direction and field direction are arranged.
[0016]
Here, the line direction is defined as a direction in which the electron beam is scanned by one line, and the field direction is defined as a direction in which the line-scanned electron beam is scanned as a surface, that is, a direction orthogonal to the line direction. I do. Therefore, for example, in the case of the cathode ray tube 31 shown in FIG. 1, the line direction indicates the horizontal direction of the screen, and the field direction indicates the vertical direction of the screen. Although not shown, in the case of a so-called multi-neck type cathode ray tube having a plurality of neck portions and an electron gun arranged in each neck portion, the electron beam scans in the screen vertical direction while the screen is horizontal. Since scanning is performed in the direction, the line direction indicates the screen vertical direction, and the field direction indicates the screen horizontal direction.
[0017]
In this color cathode ray tube 31, each electron beam B [ _BR , _BG , _BB ] emitted from the cathode corresponding to each color of the electron gun 35 is converged by the main electron lens formed with a plurality of electrodes, and the phosphor screen is formed. The focus, focus, and convergence are made on 33, and the red, green, and blue phosphor stripes are irradiated. The electron beams B _R , B _G , and B _B are deflected in the horizontal and vertical directions by the deflection yoke 36 to display a required color image.
[0018]
2 to 4 show one embodiment of the color selection mechanism 34 in the color cathode ray tube 31. FIG. This embodiment is a case where the present invention is applied to an aperture grill.
The color selection mechanism 34 according to the present embodiment includes a pair of opposed L-shaped support members 42 and 43 and a U-shaped elastic member inserted between both ends of the support members 42 and 43. A frame-shaped metal frame 46 including application members 44 and 45 is provided, and a large number of slit-shaped beams are provided between opposed support members 42 and 43 of the frame 46 in one direction, that is, in the line scanning direction of the electron beam. A color selection electrode thin plate 50 having a transmission hole is stretched.
[0019]
In the present embodiment, in particular, the color selecting electrode thin plates 50 are formed by superposing a plurality of masks 51 and 52 having beam transmitting holes at positions corresponding to each other, in this example, two masks 51 and 52. That is, the color selecting electrode thin plate 50 is composed of a metal thin plate, and a large number of thin strip-shaped grid elements 53 are arranged at a predetermined pitch in the above-mentioned one direction, and between the adjacent grid elements 53 in the field scanning direction of the electron beam. Similarly to the first mask 51 in which a long slit-shaped beam transmission hole 54 is formed, and a planar continuous connection portion 55 that connects the grid element 53 to both sides in the longitudinal direction of the beam transmission hole 54, A large number of thin strip-shaped grid elements 56 made of a thin metal plate are arranged at a predetermined pitch in the above-mentioned one direction, and a slit-shaped beam transmitting hole 57 long in the field scanning direction of the electron beam is formed between adjacent grid elements 56. The second mask 52 has a planarly continuous connecting portion 58 for connecting the grid element body 56 to both sides in the longitudinal direction of the beam transmitting hole 57. In this example, the width W1 of the grid element 53 of the first mask 51 on the phosphor screen side is made larger than the width w2 of the grid element 56 of the second mask 52 on the electron gun side, and the first mask 51 is formed. Are used as substantial color selection electrodes, and the second mask 52 is used for preventing vibration. Note that the arrangement of the first mask 51 and the second mask 52 can be reversed.
[0020]
Before the two masks 51 and 52 are welded to the frame 46, a position (a broken line position in FIG. 3) 62 between the welded portion 61 to the frame 46 and the ends of the beam transmitting holes 54 and 57 in advance. At each other. In the present embodiment, joining (so-called temporary welding) is performed by seam welding or laser welding. The joining position 62 may be intermediate between the welded portion 61 of the frame 46 and the ends of the beam transmitting holes 54 and 57, but is preferably separated from the ends of the beam transmitting holes 54 and 57 by a distance X = 1 to 4 mm. Position. If the distance X exceeds 4 mm, wrinkles may occur. If the distance X is less than 1 mm, the grid elements 53 and 56 may be thermally deformed by heat, for example, when welding is performed.
At the time of joining the two masks 51 and 52, it is desirable to join them evenly and continuously, and it is desirable that the metal sheet portion other than the joining portion 62 is not deformed. If the conditions are satisfied, the effect can be expected without specifying the joining mode.
[0021]
With the two first and second masks 51 and 52 previously bonded at the position 62 in this manner, the color selecting electrode thin plate 50 is stretched over the frame 56 and the upper surfaces of the support members 42 and 43 are provided. The color selection mechanism 34 is formed by, for example, seam welding. In FIG. 2, the frame 46 has a support spring 66 having an engagement hole 65 for engaging the panel pin at an end via a spring holder 64 in order to support the color selection mechanism 1 in the panel of the cathode ray tube. Is attached.
[0022]
In the color selection mechanism 34 having the two-mask structure of the present embodiment, when subjected to vibration from the outside, the two masks 51 and 52 attenuate each other due to the contact resistance between the two masks 51 and 52 as described above. Thus, a high damping effect can be obtained. In addition, the vibration in the normal direction to the surface of the color selecting electrode thin plate 50 has an attenuating effect because the masks 51 and 52 collide with each other.
[0023]
According to the above-described embodiment, two masks 51 and 52 are overlapped as a color selection electrode thin plate constituting the color selection mechanism 34, and a welded portion 61 to the frame and ends of the beam transmission holes 54 and 57 are previously formed. The color selection mechanism 34 is formed by using the color selection electrode thin plate 50 which is joined at a position intermediate with the portion, preferably at a position 1 to 4 mm (= distance X) away from the end of the beam transmission hole, and the blackening process is performed. After that, wrinkles are prevented from being generated in the connecting portions 55 and 58. That is, even if a difference occurs in the stress distribution between the two masks 51 and 52 after the blackening process, the distance X between the joint 62 of the masks 51 and 52 and the ends of the beam transmitting holes 54 and 57 is small. Therefore, there is almost no connecting portion between the joining portion 62 and the end of the beam transmitting hole, and the wrinkle that makes a space between the two masks 51 and 52 does not occur. Therefore, the two masks 51 and 52 are evenly adhered to each other over the entire surface, and even if external vibration is applied, vibration of the grid element of the color selection mechanism 34 can be suppressed. That is, if the two masks 51 and 52 have good adhesion, the vibration control and attenuation of the color selection mechanism are ideally performed, and the image of the color cathode ray tube is hardly disturbed. In the color selection mechanism 50 according to the present embodiment, it is possible to omit the conventional damper wire for suppressing vibration, or to reduce the number of damper wires. Therefore, the influence of the shadow of the damper line is reduced, and a high quality and high quality color cathode ray tube can be provided.
[0024]
In joining the two masks 51 and 52, the metal thin plates are welded to each other, so that the welding can be performed with a lower welding current than the welding of the metal thin plate and the frame. Therefore, the thermal deformation of the masks 51 and 52 due to this bonding is very small and negligible, and does not affect the area of the grid element body. Therefore, the uniformity of the image is not impaired. Since the two masks 51 and 52 can be welded with a low current, the pressing force can be reduced. Therefore, after the relative positions of the two masks 51 and 52 are determined, a displacement due to welding heat or pressure hardly occurs. The accuracy of the relative position of the two masks 51 and 52 can be improved, and the relative positions of the beam transmitting holes 54 and 57 do not shift, so that an appropriate amount of electron beam passes through the beam transmitting holes of the color selection mechanism 34. And the brightness and chromaticity of the image are not impaired.
[0025]
Since the two masks 51 and 52 are preliminarily joined by preliminarily joining them, when the color selection electrode plate 50 is subsequently welded to the frame 46 to assemble the color selection mechanism 34, it is as if one color selection electrode plate was used. In the same operation as when welding is performed, the color selection mechanism 34 having a so-called double mask structure can be manufactured.
[0026]
The above-described color selection mechanism of the present invention can also be applied to a color selection mechanism for a multi-neck type color cathode ray tube. The multi-neck type color cathode ray tube is provided with a tube body composed of a plurality of, for example, a funnel having two necks, not shown, and a panel forming a large screen. A color selection mechanism is arranged by an aperture grill, and an electron gun is arranged in each neck. The panel is formed integrally and is formed in a horizontally long shape having a screen horizontal direction as a long axis and a screen vertical direction as a short axis. Along with this, the color selection mechanism is formed in common to the large screen area of the panel, and stretches the color selection electrode thin plate, which has a long slit-shaped beam transmission hole in the horizontal direction of the screen, on the frame. It is made by welding. This multi-neck type color cathode ray tube performs a field scan in a screen horizontal direction while an electron beam from each electron gun performs a line scan in a screen vertical direction with respect to each small image area of a panel to display a large screen. Is made. This color selection mechanism can be constituted by the color selection mechanism having the double mask structure described in the above embodiment.
Further, the above-described color selection mechanism of the present invention can be applied to a so-called slot mask used for a shadow mask type color cathode ray tube.
[0027]
The present invention can be configured as a display device such as a television receiver or a computer display by incorporating a color cathode ray tube having the above-described color selection mechanism into a set.
[0028]
【The invention's effect】
According to the color-selecting electrode thin plate according to the present invention, a plurality of, for example, two masks are superimposed, and a welded portion to the frame and an end portion of the beam transmission hole are joined and integrated, so that this is integrated. When a color selection mechanism is produced by welding on a frame, wrinkles can be eliminated and the adhesion between masks can be improved. When the bonding portion of the mask is provided at a position 1 to 4 mm away from the end of the beam transmission hole, wrinkles can be more reliably eliminated, and the adhesion between the masks can be improved.
Since a plurality of thin masks are joined in advance, a low welding current is sufficient when joining by welding, and deformation of the mask due to welding heat can be avoided. The accuracy of the relative position between the plurality of masks can be improved. Since a plurality of masks are joined and integrated, when assembling the color selection mechanism, it is possible to assemble them by the same means as when assembling a single normal color selection electrode thin plate.
[0029]
According to the color selection mechanism according to the present invention, a plurality of, for example, two masks constituting the color selection electrode thin plate can be uniformly brought into close contact with each other, and even when subjected to external vibration, the color selection electrode thin plate And damping can be ideally performed. Omitting or reducing the number of damper lines becomes possible, and the shadow of the damper lines on the screen can be eliminated or reduced. Since the accuracy of the relative position of the beam transmitting hole between the masks is improved, an appropriate amount of the electron beam can pass through the beam transmitting hole.
[0030]
According to the cathode ray tube of the present invention, since the above-described color selection mechanism is provided, the vibration of the color selection mechanism is suppressed even when external vibration is received, and the image is not disturbed. Since an appropriate amount of electron beam can pass through the beam transmission hole of the color selection mechanism, the brightness and chromaticity of the image are not impaired. Since the grid element of the color selection mechanism is not thermally deformed, the uniformity of the image is not impaired. Accordingly, it is possible to provide a cathode ray tube having high image quality and high quality, and for example, it is possible to implement a color cathode ray tube having a large size and a high definition.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a color cathode ray tube according to the present invention.
FIG. 2 is a configuration diagram illustrating an embodiment of a color selection mechanism according to the present invention.
FIG. 3 is an enlarged view of a main part of FIG. 2;
FIG. 4 is a cross-sectional view taken along line DD of FIG. 3;
FIG. 5 is a configuration diagram illustrating an example of a conventional color selection mechanism.
FIG. 6 is an enlarged view of a main part showing another example of a conventional color selection mechanism.
FIG. 7 is a sectional view taken along line AA of FIG. 6;
8A is a cross-sectional view taken along the line BB of FIG. 6 for explaining a problem of the color selection mechanism of FIG. 6; FIG. 7B is a cross-sectional view taken along line CC of FIG. 6.
9A and 9B are explanatory diagrams for explaining a problem of the color selection mechanism of FIG. 6;
[Explanation of symbols]
31 ... color cathode ray tube, 32 ... tube, 32P ... panel, 32N ... neck, 33 ... phosphor screen, 34 ... color selection mechanism, 35 ... electron gun 36 ... deflection yoke, B _{[B R,} B G, _{B B]} .. electron beam, 42, 43 ... support member, 44, 45 ... elasticity imparting member, 46 ... frame, 50 ... Color-selecting electrode thin plates, 51, 52 ... Mask, 53,56 ... Grid body, 54,57 ... Beam transmission holes, 55,58 ... Connecting parts, 61 ... Weld, 62 ... joint

Claims (9)

A plurality of masks provided with beam transmission holes at positions corresponding to each other are superimposed,
The electrode plate for color selection, wherein the superposed masks are joined to each other at a position between an end of the beam transmission hole and a welded portion to a frame. 2. The electrode plate for color selection according to claim 1, wherein two masks are overlapped. 2. The electrode plate for color selection according to claim 1, wherein the bonding portion of the mask is located at a distance of 1 to 4 mm from an end of the beam transmission hole. A beam selection hole is provided at a position corresponding to each other, a plurality of masks are overlapped, and the overlapped mask is previously joined at a position between an end portion of the beam transmission hole and a welded portion of a frame. Having a thin plate,
A color selection mechanism, wherein the color selection electrode thin plate is stretched and welded on the frame. The color selection mechanism according to claim 4, wherein the color selection electrode thin plate is formed by a two-layered mask. 5. The color selection mechanism according to claim 4, wherein a bonding portion of the mask on the color selection electrode thin plate is located at a distance of 1 to 4 mm from an end of the beam transmission hole. A plurality of masks provided with beam transmitting holes at positions corresponding to each other are superimposed, and the superimposed masks are previously joined at a position between an end of the beam transmitting hole and a welded portion to a frame. A cathode ray tube comprising: a color selection electrode thin plate; and a color selection mechanism in which the color selection electrode thin plate is stretched and welded on the frame. The cathode ray tube according to claim 7, wherein the color selecting electrode thin plate of the color selecting mechanism is formed by a two-layered mask. 8. The cathode ray tube according to claim 7, wherein a joining portion of the mask in the color selecting electrode thin plate of the color selecting mechanism is located at a distance of 1 to 4 mm from an end of the beam transmitting hole.

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