JPS6149785B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color picture tube. For example, a conventional black stripe type color picture tube has three single electron guns 33a, each of which emits an electron beam independently, as shown in FIGS.
33b and 33c are arranged in parallel on a horizontal plane passing through the central axis of the envelope 20 consisting of the rectangular panel 22, the funnel 21, and the neck 32, and the central single electron gun 33a is arranged on the central axis. 3 electron gun 34 , and a rectangular slit hole 28 inside the panel 22 facing the electron gun 34 .
The user wears a shadow mask 30 in which a large number of . In the figure, 35 is a convergence electrode, and 36 is a deflection device. However, this shadow mask 3
0, on the inner surface of the rectangular panel 22, a large number of black light-absorbing stripes are applied in parallel in the long side direction of the panel 22 so as to be substantially parallel to the rectangular sides of the panel 22. , phosphor strips 25R, 25 that emit red, green, and blue light between each strip 24 and emit different colors.
A fluorescent surface 26 is formed by forming G and 25B vertically without any cuts. On the effective surface of the shadow mask 30 , rectangular slit through holes 28 are linearly arranged through bridges 29 in the longitudinal direction of the panel, that is, in the long side direction of the panel, forming a through hole row. They are arranged in parallel at a predetermined pitch P in the horizontal direction, that is, in the short side direction of the panel. By the way, when a color image is reproduced using this color picture tube, a shadow 49 of the bridge 29 of the shadow mask 30 appears on the fluorescent surface 26. This shadow 49 does not contribute to the light emission of the phosphor nor to the absorption of external light, and therefore degrades the brightness and contrast of the color picture tube. Furthermore, in a color picture tube having an in-line type three electron gun as described above, the deflection yoke 36 is used as is well known.
By changing the horizontal deflection magnetic field distribution to a strong pink tension magnetic field and the vertical deflection magnetic field distribution to a strong barrel magnetic field, dynamic convergence can be omitted. Since it has a substantially rectangular shape that is long in the horizontal direction, the deflection angle of the electron beam is larger in the horizontal direction than in the vertical direction. Therefore, in the color picture tube mentioned above, since the electron guns are arranged in a row in the horizontal direction where the deflection angle is large, it is possible to omit dynamic convergence by making the horizontal deflection magnetic field distribution into a very strong pink tension magnetic field. It's on. For this reason, there was a drawback that convergence design, that is, design of the deflection yoke was extremely difficult. Furthermore, since the above-mentioned deflection magnetic field distribution is employed, there is a drawback that raster distortion in the lateral direction, that is, side pink friction distortion is large, and it is difficult to design a correction circuit for this distortion. The present invention has been made in view of the above-mentioned conventional drawbacks, and provides in-line electron guns arranged in a line in a first direction with a small deflection angle, that is, in a direction substantially parallel to the short side of a rectangular panel. and a through hole in which slit through holes are linearly arranged through a bridge in a second direction perpendicular to the first direction, that is, in a direction substantially parallel to the long sides of the rectangular panel. The rows are arranged in parallel at a predetermined pitch in the short side direction of the rectangular panel, and phosphor strips of different luminescent colors are elongated on the inner surface of the rectangular panel in a direction substantially parallel to the long side of the rectangular panel. The object of the present invention is to provide a color picture tube that is formed in such a manner that it is possible to reproduce a color image with excellent color purity, brightness, and high contrast. Next, a first embodiment of the color picture tube of the present invention will be described with reference to the drawings. As shown in FIG. 5, the envelope 50 consists of a funnel-shaped funnel 51 and a panel 52 joined to the large-diameter end of the funnel 51. As shown in FIG. On the inner surface of the rectangular panel, phosphor strips 62R, 62G, and 62B emitting light of different colors, e.g., red, green, and blue, correspond to a central beam and a pair of side beams, which will be described later.
A large number of fluorescent surfaces 63 are deposited seamlessly and parallel to each other in a second direction substantially parallel to the long sides of the rectangular panel.
is formed. Close to this phosphor surface 63 , a rectangular slit hole 78 is provided inside the phosphor strips 62R, 62 as shown in FIGS. 7 and 8.
G, 62B are arranged in a straight line through a bridge 79 in the same horizontal direction as the longitudinal direction to form a row of through holes, and the row of through holes is arranged at a constant pitch in a first direction parallel to the short side of the rectangular panel. Slit-shaped shadow masks 80 are arranged in parallel with P _V . The through hole 78 has a set of phosphor strips 6 arranged in a certain order.
There is a one-to-one correspondence with 2R, 62G, and 62B. Inside the net 52, which forms the small diameter portion of the funnel 51 facing the shadow mask 80 , there are
Three single electron guns 53a, 53b, and 53c, each of which independently emits an electron beam, are arranged in parallel along the vertical direction passing through the center axis of the network, that is, a first direction with a small deflection angle, and the central single electron gun 53a An in-line three-electron gun 54 is disposed on the central axis. The central single electron gun 53a emits a central beam passing on the central axis, and the single electron guns 53b and 53c on both sides emit a pair of side beams passing on both sides of the central beam. In the figure, 56 is a deflection device. To specifically illustrate the structure of the color picture tube described above using numerical values, an example of a color picture tube with 18 inches and 90 degrees deflection is as follows. Eccentric distance of the electron gun 6.6mm Distance between the electron gun and the inner surface of the panel 323.7mm Distance between the shadow mask and the inner surface of the panel 5.8mm Vertical pitch of the hole in the shadow mask P _V
0.3mm Horizontal pitch of the hole in the shadow mask P _H
1.0mm Shadow mask bridge width K 0.15mm Phosphor stripe height H _P 0.102mm The magnetic field distribution of the color picture tube deflection device 56 of the first embodiment of the present invention as described above is horizontally deflected as shown in FIG. Dynamic convergence can be omitted by using a barrel magnetic field as the magnetic field and a pink tension magnetic field as the vertical deflection magnetic field. As described above, since the electron guns are arranged in a row in the direction with a small deflection angle, that is, in the vertical direction, it is easy to design the deflection magnetic field distribution, and excellent convergence quality can be obtained. In addition, since the horizontal deflection magnetic field is a barrel magnetic field and the vertical deflection magnetic field is a pink tension magnetic field, it is possible to design a side pink tension distortion of 0%, which is more expensive than a top-and-bottom pink tension correction circuit. The pink tension correction circuit can be omitted. Furthermore, by optimizing the centrifugal distance of the electron gun, the dimensions of the color picture tube, and the deflection yoke design, it is also possible to omit the side pink shock distortion correction circuit and the top and bottom pink shock distortion correction circuit. In addition, if the shadow mask causes doming due to the energy of the electron beam, the shadow mask is also approximately rectangular in the horizontal direction and has a relatively large deflection angle, so the amount of thermal expansion in the horizontal direction is larger than that in the vertical direction, and The amount of beam movement on the fluorescent surface is also large in proportion to the angle. Since the phosphor surface 52 adapted to this embodiment is composed of phosphor strips that are continuous in the long side direction of the panel, that is, in the second direction, deterioration of color purity during doming is significantly reduced. Furthermore, as mentioned above, the distance between the shadow mask and the inner surface of the panel is approximately half that of a conventional color tube, so the amount of mislanding of the electron beam during doming and the amount of mislanding of the electron beam due to geomagnetism and manufacturing errors of the color picture tube are reduced. is approximately 1/2 that of conventional color tubes. Furthermore, since the phosphor surface is composed of phosphor strips with no breaks in the horizontal direction, so-called color vertical moiré does not occur at all. Also, as is well known, in shadow mask color picture tubes, in order to ensure color purity, a so-called guard band is provided between the width of the phosphor and the width of the beam. The larger the angle of the picture tube, the larger it must be. For this reason, the light emitting area had to be inevitably reduced, making it impossible to improve the brightness. However, in this embodiment, since the required direction of the guard band coincides with the direction of the smaller deflection angle, the required guard band is smaller than that of the conventional case, and therefore the light emitting area is increased and the picture tube becomes brighter. It can be done. As described above, according to the color picture tube of this embodiment, a color picture tube having excellent convergence characteristics, raster distortion characteristics, and color purity characteristics can be easily designed and manufactured. FIG. 10 shows a second embodiment of the invention. That is, a light-absorbing strip 91 made of a black light-absorbing material such as graphite is formed on the inner surface of the panel in the horizontal direction perpendicular to the central axis of the envelope, that is, in the second direction.
in the direction of. A phosphor surface 93 is provided between each strip 91 by applying a large number of phosphor strips in parallel and forming phosphor strips 92R, 92G, and 92B of different luminescent colors, e.g., red, green, and blue, without a break in the horizontal direction. There is. The phosphor strips 92R, 92G, and 92B emit light of different colors in the vertical direction through the light absorption strip 91, corresponding to the central beam and the pair of side beams, e.g.
They are regularly arranged in a certain order, such as blue, red, green, and blue. In the color picture tube of this embodiment having such a fluorescent surface, in addition to the above-mentioned effects, reflection of external light is reduced and an image with high contrast can be obtained. As described above, according to this embodiment, a color picture tube having excellent convergence characteristics, raster distortion characteristics, color purity characteristics, and contrast characteristics can be obtained. Next, a third embodiment of the color picture tube of the present invention will be described. The main parts of this embodiment are the same as those of the first embodiment shown in FIGS. 5 and 7 except for the fluorescent surface attached to the inner surface of the panel, so the explanation will be omitted without drawing. As shown in FIG. 11, a light-absorbing strip 101 made of a black light-absorbing material such as graphite is formed on the inner surface of the rectangular panel at a portion corresponding to the bridge 79 of the shadow mask shown in FIG. Between the light absorbing strips, phosphor strips 102R, 10 emitting light of different colors, e.g., red, green, and blue, are provided.
A phosphor surface 103 is formed in which a large number of phosphor strips 2G and 102B are formed such that the longitudinal direction of the phosphor strips is parallel to the long side direction of the rectangular panel, that is, the second direction. As shown in FIGS. 7 and 8, a rectangular slit hole 78 is provided close to and inside the fluorescent surface 103 for the fluorescent strips 102R and 102.
A slit-shaped shadow mask 80 is provided in which the through-holes are arranged in a straight line through the bridge 79 in the same horizontal direction as the longitudinal direction of 2G and 102B, and the through-holes are arranged in parallel in the vertical direction at a constant pitch _PV . has been done. The through hole has a set of phosphor strips 102R, 102G, 102B arranged in a certain order.
There is a one-to-one relationship between the bridge and one light-absorbing strip. Inside the net 52, which forms the small diameter portion of the funnel 51, facing the shadow mask 80 ,
Three single electron guns 53a, 53b, and 53c, each of which independently emits an electron beam, are arranged in parallel along the vertical direction passing through the network central axis, that is, the first direction, and the central single electron gun 53a is arranged along the central axis. An in-line three-electron gun 54 is provided. The central single electron gun 53a emits a central beam passing on the central axis, and the single electron guns 53b and 53c on both sides emit a pair of side beams passing on both sides of the central beam. Note that 56 is a deflection device that deflects the electron beam. To specifically illustrate the structure of the color picture tube using numerical values, an example of an 18-inch 90-degree deflection color tube is as follows. Eccentric distance of the electron gun 6.6mm Distance between the electron gun and the inner surface of the panel 323.7mm Distance between the shadow mask and the inner surface of the panel 5.8mm Vertical pitch of the hole in the shadow mask P _V
0.3mm Horizontal pitch of the hole in the shadow mask P _H
1.0mm Bridge width of shadow mask K 0.15mm Width of phosphor strip DP 0.82mm Height of phosphor strip HP 0.102mm Width of light-absorbing strip DB 0.20mm Height of light-absorbing strip HB 0.306 mm According to the color picture tube of this embodiment as described above,
Since light-absorbing strips are provided in the areas corresponding to the bridges of the shadow mask, all of the phosphor strips can contribute to light emission, and the light-absorbing strips absorb external light, resulting in a bright, high-contrast color picture tube. is obtained. In addition, since the distance between the shadow mask and the inner surface of the panel is approximately 1/2 that of conventional color picture tubes, the deterioration of color purity due to manufacturing errors, doming, geomagnetism, etc. is approximately 1/2 that of conventional color picture tubes. You will get an attractive colored tube. Furthermore, since the electron guns are arranged in-line in the vertical direction, that is, the first direction, where the deflection angle is small, the design of the deflection device is facilitated, and it is possible to design a deflection device that does not require dynamic convergence or deflection distortion correction. Become. Needless to say, excellent convergence quality can be obtained. Further, since the phosphors of the same luminescent color are arranged on a line parallel to the horizontal axis, that is, the direction perpendicular to the first direction, there is an advantage that color moiré is eliminated. As described above, according to this embodiment, it is possible to obtain a color picture tube that is bright, has high contrast, and has excellent color purity. FIG. 12 shows a fourth embodiment of the color picture tube of the present invention. That is, light-absorbing stripes 114 made of a black light-absorbing substance such as graphite are coated on the inner surface of the panel in parallel to the long sides of the rectangular panel, that is, in the second direction, and as in the third embodiment. A light-absorbing strip 111 made of a light-absorbing material is applied to a portion of the shadow mask corresponding to the bridge, and a light-emitting strip 111 made of a light-absorbing material is applied to the area surrounded by the light-absorbing strip 114 and the light-absorbing strip 111, emitting light emitting, for example, red, green, and blue. Rectangular phosphor strips 112R, 112G, 1 with different colors
12B, it is possible to obtain a color picture tube that is bright, has higher contrast than the third embodiment, and has better color purity. Next, a fifth embodiment of the color picture tube of the present invention will be described. In this embodiment, the bridges of the above-mentioned shadow mask, which had different steps, have been changed to straight lines, and for the sake of convenience, the same reference numerals are used in FIG. 5 and FIG. 13 used in the first embodiment. Then, the shadow mask 80 is provided with a light-transmitting portion 78 via a bridge 79 in the short side direction of a rectangular panel (not shown), which is the same as in the previous embodiment, but the bridge 79 of each through-hole row is It's in a straight line. Therefore, based on the concept of the third embodiment described above, a light absorption band made of, for example, graphite is placed at a position corresponding to the bridge, and the light absorption strip is aligned in the first direction as shown in FIG. A large number of 121 are formed so that their longitudinal directions are parallel,
Between the light absorption strips 121, phosphor strips 122R, 12 emitting light of different colors, e.g., red, green, and blue, are provided.
2G and 122B are formed in large numbers in a horizontal direction perpendicular to the first direction, that is, in a second direction, so that the longitudinal direction of the phosphor strips is parallel to each other.
23 is formed. Close to and inside this fluorescent surface 123 , as shown in FIG.
22G and 122B are arranged in a straight line through bridges 79 in the same horizontal direction as the longitudinal direction to form a light-transmitting row, and the light-transmitting rows are arranged vertically at a constant pitch, and the bridges 79 are arranged in a straight line in the vertical direction. The through holes in which the slit-shaped shadow masks 80 are arranged are arranged in a fixed order.
A group of phosphor strips 122R, 122G, and 122B correspond in a one-to-one relationship, and a group of bridges arranged in a vertical line also correspond to one light-absorbing strip. . Opposed to this shadow mask 80 , in a net 52 forming a small diameter portion of the funnel 51 shown in FIG.
An in-line three-electron gun 54 is provided in which the three electron beams are arranged in parallel in a first direction passing through the network central axis, and the central single electron gun 53a is disposed on the central axis. The central single electron gun 53a emits a central beam passing on the central axis, and the single electron guns 53b, 53 on both sides
c emits a pair of side beams passing on either side of this central beam. Note that 56 is a deflection device that deflects the single electron beam. To specifically illustrate the structure of the above-mentioned color picture tube using numerical values, an example of a color tube with an 18-inch 90-degree deflection is as follows. Eccentric distance of the electron gun 6.6mm Distance between the electron gun and the inner surface of the panel 323.7mm Distance between the shadow mask and the inner surface of the panel 5.8mm Vertical pitch of the hole in the shadow mask P _V
0.3mm Horizontal pitch of the hole in the shadow mask P _H
1.0mm Bridge width of the shadow mask K 0.15mm Width of the phosphor strips DP 0.82mm Height of the phosphor strips HP 0.102mm Width of the light absorption strips D _B 0.20mm According to this embodiment as described above Since the light absorption stripes are provided on the fluorescent surface portions that correspond to the bridges of the shadow mask and do not contribute to light emission, the contrast can be improved. In addition, as is well known, in shadow mask color picture tubes, in order to ensure color purity, there is a difference between the width of the phosphor and the width of the beam, a so-called guard band. Therefore, the light emitting area had to be made small, and the brightness could not be improved.However, by creating a structure like this example, the required direction of the guard band can be adjusted to the deflection angle. Since it coincides with the smaller direction, the required guard band is smaller than in the past, and the light emitting area can be increased to provide a bright picture tube. In other words, the beam width in the width direction of the phosphor is made larger than before, and light-absorbing stripes are provided in the shadow mask bridge part, which is originally a non-emitting part, which improves overall contrast and brightness. can be done. In addition, since the distance between the shadow mask and the inner surface of the panel is approximately 1/2 that of a conventional color picture tube, the deterioration of color purity due to manufacturing errors, doming, geomagnetism, etc. is approximately 1/2 that of a conventional color picture tube. An excellent color picture tube can be obtained. Furthermore, since the single electron guns are arranged in-line in the vertical direction where the deflection angle is small, the design of the deflection device is facilitated, and it is possible to design a deflection device that does not require dynamic convergence or correction of deflection distortion. Needless to say, excellent convergence quality can be obtained. Also, the horizontal axis, i.e. the first
Since the phosphors of the same emission color are arranged on a line parallel to the second direction perpendicular to the second direction, there is also an advantage that color moiré is eliminated. Regarding the formation of the light-absorbing stripes, three exposures are required in conventional color picture tubes, but the coating forming the black stripes in this example requires only one exposure and the manufacturing process is simple. It has the advantage of being standardized. As described above, according to this embodiment, a color picture tube that is bright, has high contrast, excellent color purity, high quality convergence and deflection distortion characteristics, and has a simple screen manufacturing process can be obtained. Next, a sixth embodiment of the color picture tube of the present invention will be explained with reference to FIG. The in-line electron gun and shadow mask used in this example are the fifth
The fluorescent surface 133 is omitted because it is similar to the embodiment of
As in the fifth embodiment described above, the light absorption strip 131 is linearly connected to the short side of the rectangular panel, that is, the first direction, and the light absorption strip 131 is connected linearly to the short side of the rectangular panel, that is, the second direction perpendicular to the first direction.
phosphor strips 132 that are arranged at predetermined intervals in the direction of
Light absorption strips 134 are also provided between R, 132B, and 132G, respectively. By having such a structure, contrast and color purity can be further improved in addition to the effects of the fifth embodiment described above. In the embodiments described above, except for the first embodiment, the deflection device has been omitted or briefly described, but this has the same effect as the first embodiment. In addition, in the second, fourth, and sixth embodiments, light-absorbing stripes were provided between each of the phosphor strips emitting light of three colors or between the phosphor strips. However, the invention is not limited to this, and the phosphor strips that emit light in three colors corresponding to one shadow mask perforation or the phosphor strips that are closely spaced without providing a light absorbing strip. By depositing phosphors of each color on the phosphor and then providing a light-absorbing strip only between the phosphor strips or the phosphor strips that emit light in the three colors,
Of course, the brightness can also be further improved.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a conventional black stripe type color picture tube, Fig. 2 is a plan view showing a part of the fluorescent surface shown in Fig. 1, and Fig. 3 is a part of the shadow mask shown in Fig. 1. FIG. 4 is a partially cutaway perspective view showing the positional relationship between the fluorescent surface and the shadow mask in FIG. 1, FIG. 5 is a partially cutaway perspective view of the color picture tube of the present invention, and FIG. The first color picture tube of the present invention
7 is a plan view showing a shadow mask corresponding to FIG. 6, and FIG. 8 is a main part showing the positional relationship between the fluorescent surface and the shadow mask in FIG. 5. FIG. 9 is a cutaway perspective view, FIG. 9 is a curve diagram showing the vertical deflection magnetic field and horizontal deflection magnetic field of the deflection device adapted to FIG. 2nd, 3rd, 4th
FIG. 13 is a plan view of a shadow mask applicable to the fifth and sixth embodiments of the color picture tube of the present invention, FIG. 14, and FIG.
FIG. 5 is a plan view of a fluorescent surface adapted to the fifth and sixth embodiments of the color picture tube of the present invention, respectively. 34 , 54 ...In-line type 3 electron gun, 30 , 8
0...Shadow mask, 28,78...Slit-like through hole, 29,79...Bridge, 26 , 63 , 9
3, 103 , 113 , 123 , 133 ...fluorescent surface.

Claims (1)

[Claims] 1. Three in-line electron guns arranged in a row along a first direction with a small deflection angle, and arranged via a bridge in a second direction perpendicular to the first direction. a shadow mask having a slit-like through-hole, and a shadow mask having red, green, and blue colors arranged in a predetermined order corresponding to each electron beam emitted from the in-line three-electron gun in the second direction. 1. A color picture tube comprising a phosphor surface made of continuous phosphor strips that emit light. 2. In-line type 3 electron guns arranged in a row along a first direction with a small deflection angle, and slit-shaped through holes arranged via a bridge in a second direction perpendicular to the first direction. a shadow mask having a red, green, and blue color arranged in a predetermined order corresponding to each electron beam emitted from the in-line three-electron gun in the second direction; 1. A color picture tube comprising: a fluorescent surface made of a phosphor strip having a light-absorbing strip in a portion corresponding to the phosphor surface; 3 In-line type 3 electron guns arranged in a row along a first direction with a small deflection angle, and slit-shaped through holes arranged via a bridge in a second direction perpendicular to the first direction. a shadow mask having a red, green, and blue color arranged in a predetermined order corresponding to each electron beam emitted from the in-line three-electron gun in the second direction; 1. A color picture tube comprising: a phosphor surface comprising phosphor strips having continuous light absorbing strips at predetermined intervals along one direction; 4. Three in-line electron guns arranged in a row along a first direction with a small deflection angle, and a slit-shaped through hole arranged via a bridge in a second direction perpendicular to the first direction. a shadow mask having a section, and continuous fireflies emitting red, green, and blue colors disposed in a predetermined order corresponding to each electron beam emitted from the in-line three-electron gun in the second direction. 1. A color picture tube comprising a fluorescent surface comprising light stripes and light absorption stripes formed between the phosphor strips. 5 In-line type 3 electron guns arranged in a row along a first direction with a small deflection angle, and slit-shaped through holes arranged via a bridge in a second direction perpendicular to the first direction. phosphor strips that emit light in red, green, and blue colors arranged in a predetermined order corresponding to each electron beam emitted from the in-line three-electron gun in the second direction; and a phosphor surface having light-absorbing stripes between the phosphor strips and at portions corresponding to the bridges. 6. Three in-line electron guns arranged in a row along a first direction with a small deflection angle, and a slit-shaped through hole arranged via a bridge in a second direction perpendicular to the first direction. phosphor strips that emit light in red, green, and blue colors arranged in a predetermined order corresponding to each electron beam emitted from the in-line three-electron gun in the second direction; and a phosphor surface comprising light absorption stripes formed at predetermined intervals between the phosphor strips and along the first direction.