JPH0963497A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode-ray tube which eliminates generation of color shear by setting an arrangement pitch of three-colored phosphor unit bodies in a long side of a panel and the rate of an interval from the center of a blue phosphor element to the center of a red phosphor element to specific values. SOLUTION: Electron beams emitted from an electron gun 11 move by local doming on a shadow mask 6 or moving of a panel 5 inside to a fluorescent screen 1 side by thermal expansion. The respective red, green, and blue electron beams 50 passing through an aperture 13 of the shadow mask 6 move while holding the relation of the BM alignment rate and the beam alignment rate. The moving distance of the electron beam caused by the local doming is the longest in the region from the center PO of the fluorescent screen 1, where the thermal deformation of the shadow mask 6 by the local doming is the largest, to 3/4P of the effective diameter (P). The intervals of phosphor elements 2 from red to blue becomes 2/3 of the arrangement pitch of the phosphor elements 2 or less by setting it to 95% BM alignment rate 97% in this region.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor screen in which a light absorption layer is arranged between stripe-shaped three-color phosphor elements,
The present invention relates to a fluorescent screen structure of a color CRT equipped with a red, green, and blue electron gun and a shadow mask.

[0002]

2. Description of the Related Art FIG. 8 is a partially cutaway side view of a conventional color cathode ray tube. In FIG. 8, 5 is a rectangular panel, 9 is a funnel, and a skirt portion 5a of the panel 5 has a welded glass 8 interposed therebetween. Joined and integrated. Panel 5
The inside of the funnel 9 is maintained in a vacuum to form a color cathode ray tube 14. Reference numeral 1 denotes a phosphor screen formed on the inner surface of the panel 5. As shown in FIG. 2, the phosphor screen 1 has phosphor elements 2 of three colors of red R, green G, and blue B in the short side direction of the panel 5. The light absorption layers 3 made of graphite are formed between the phosphor elements 2 while being formed and arranged in a stripe shape. Reference numeral 6 denotes a shadow mask, which has a slot-shaped opening 13 having a long axis in the short side direction of the rectangular panel 5 through which an electron beam 50 emitted from an electron gun 11 provided in a neck portion 9a of the funnel 9 passes. The shadow mask 6 is disposed at a predetermined distance from the fluorescent screen 1, the peripheral skirt portion 6a of the shadow mask 6 is supported by the frame 12 by welding, and the frame 12 is the inner surface of the skirt portion 5a of the panel 5. It is supported by the panel 5 via a pin 7 provided on the panel.
A deflection yoke 15 deflects the electron beam 50 emitted from the electron gun 11 to scan the entire surface of the shadow mask 6. 10 is an internal magnetic shield, and a color cathode ray tube 14
During the operation of, the electron beam 50 emitted from the electron gun 11 is prevented from being deflected by an external magnetic field such as geomagnetism.

Next, the operation of the above configuration will be described.
The red R, green G, and blue B electron beams 50 emitted from the electron gun 11 are deflected by the deflection yoke 15, scan the entire surface of the shadow mask 6, pass through the apertures 13, and pass through the inner surface of the panel 5. The phosphor elements 2 which are projected on the phosphor screen 1 and are arranged in stripes are excited to emit light. At this time, the electron beams 50 are arranged on the phosphor screen 1 at intervals as shown in FIG. The ratio of the electron beam interval to the arrangement pitch Wp2 in the long side direction is represented by the following formula. The value obtained by the following formula is generally called the beam alignment rate. In FIG. 3, the interval from blue B to red R of the electron beam 50 is W
When BR2 and the arrangement pitch in the long side direction are Wp2, beam alignment rate = WBR2 / WP2 × 150 (%). Further, the red R, green G, and blue B phosphor elements 2 at positions where the red R, green G, and blue B electron beams 50 passing through the apertures 13 of the shadow mask 6 impinge on the phosphor screen 1, respectively. In FIG. 2, as shown in FIG. 2, how much the interval between the phosphor elements 2 arranged at a predetermined interval on the inner surface of the panel 5 occupies the trio pitch Wpl in the long side direction of the phosphor screen. Is represented by the following formula. The value obtained by the following formula is generally called the BM arrangement rate.

In FIG. 2, when the spacing from red R to blue B of the phosphor elements 2 is WBR1 and the arrangement pitch of the phosphor elements 2 in the long side direction is WP1, BM arrangement ratio = WBR1 / WP1 × 150 ( %) ... The transmittance of the electron beam 50 of the shadow mask 6 is usually 15 to 30%, and the transmittance of the electron beam 50 is 70 to 70%.
Since 85% of the shadow mask 6 strikes the shadow mask 6 and is converted into heat, the shadow mask 6 is heated as a whole to cause thermal expansion and deformation. This is generally called doming. This doming reaches a constant state when the operating state of the color CRT 14 continues for several minutes. On the other hand, since the electron beam energy from a particularly bright portion in the screen is high, the shadow mask 6 is locally heated and locally deformed. This local doming is called local doming.

Next, the cause of the occurrence of local doming will be described with reference to FIG. In the figure,
The portion indicated by the broken line 6b indicates the portion where thermal deformation occurs due to thermal expansion of the shadow mask 6 which causes local doming. The portion where such local doming occurs will be described geometrically in order from the occurrence thereof. The electron beam 50 emitted from the point A of the electron gun 11 receives the deflection yoke 15
The entire surface of the shadow mask 6 is scanned by being deflected from the deflection center B of the above. For example, the electron beam 50a passes through the deflection center B, the point C of the shadow mask 6 and the point D on the phosphor screen 1, and strikes. Since 70 to 85% of the electron beam 50 strikes the shadow mask 6 and is converted into heat, the shadow mask 6 undergoes thermal deformation as shown by a broken line 6b after a few seconds, and the point C moves to the point E. To do.

As a result, the electron beam 5 on the phosphor screen 1
The collision point of 0b moves from the point D to the point F on the extension of the straight line connecting the points B and E, and collides with a point different from the original point (hereinafter referred to as mislanding) to cause a color shift phenomenon. . Due to the local doming as described above, the electron beam 50 moves in the long side direction of the phosphor screen 1 toward the center PO point of the phosphor screen 1 as shown by the arrow in FIG. Also,
When the local doming occurs in the shadow mask 6, the distance between the fluorescent screen 1 on the inner surface of the panel 5 and the shadow mask 6 becomes narrower, and as shown in FIG.
Since the distances between the red R, green G, and blue B electron beams 50 emitted from the electron beam 50 on the phosphor screen 1 are small, the relationship between the BM alignment rate and the beam alignment rate is In a normal state, BM alignment rate <beam alignment rate over the entire phosphor screen 1. The relationship between the BM alignment rate and the beam alignment rate is BM alignment rate <beam alignment rate as described above, and red R and blue of the electron beam 50 on the phosphor screen 1 are indicated by the arrows in FIG. 7B. The interval of B is larger than the interval of red R and blue B of the phosphor element 2. Therefore, when local doming occurs, the electron beam on the fluorescent screen is moved in the long side direction on the fluorescent screen 1 by the combination of the movements of the two electron beams 50 as shown in FIGS. 7A and 7B. The movement amount of 50 is as shown in FIG. That is, the electron beam 50 by local doming
The amount of movement of R is G <B <B in the left half on the phosphor screen 1, and R>G> B in the right half.
Above, on the left half on the phosphor screen 1, the blue B electron beam 50
Irradiates the red R phosphor element 2 located in the center PO direction of the phosphor screen 1, and the red R electron beam 50 is located in the center PO direction of the phosphor screen 1 in the right half on the phosphor screen 1. Blue B
Then, each of the blue B and red R phosphor elements 2 emits light, and mislanding occurs.

The red R, green G, and blue B electron beams 50 emitted from the electron gun 11 provided on the rectangular funnel 9 are deflected by the deflection yoke 15 and scan the entire surface of the shadow mask 6. , Shadow mask 6
To pass through the apertures 13 of the above and project on the phosphor screen 1 to excite each of the red R, green G, and blue B phosphor elements 2 arranged in stripes to emit light. Shadow mask 6
Of the red R, green G, and blue B electron beams 50 that have passed through the apertures 13 of the electron beam 50 when they strike the phosphor screen 1, as shown in FIG. When expressed as the electron beam density distribution in the long side direction, when the vertex of the electron beam density distribution is 100%, the electron beam 5 at 5% of the electron beam density distribution
When the width WB of 0 is the width of the electron beam 50 in the long side direction of the panel 5 when the phosphor screen 1 is bombarded, the red WB, the green G, and the blue B arranged on the phosphor screen 1 respectively. The stripe-shaped phosphor element 2 has a width larger than the width of the panel 5 in the long side direction, and as shown in FIG. 5, each of red R, green G, and blue B on the phosphor screen 1 formed on the inner surface of the panel 5 Electron beam 5
A part of 0 is projected to the light absorption layer 3 arranged on the inner surface of the panel 5.

WS is the width of the red R, green G, and blue B phosphor elements 2 in the long side direction of the panel 5, and WB is the width of the electron beam 50 in the long side direction of the panel 5 on the phosphor screen 1. At this time, the width of the electron beam 50 impinging on the light absorption layer 3 is obtained by the following formula. (WB-WS) / 2 ... The width of a part of the electron beam 50 obtained by the above equation is generally called a chip tolerance. The width of the chip tolerance is WK, and the width of the light absorption layer 3 in the long side direction of the panel 5 is WK.
In the case of BM, the width WT of a portion of the light absorption layer 3 where the electron beam 50 does not impinge, which is obtained by the following equation, is generally called the other-color hitting margin. WBM-WK ・ ・ ・ Generally, the relationship between the chipping tolerance WK and the other color striking tolerance WT is shown in FIG.
As shown in FIG. 1, in the region S3 that is the entire phosphor screen 1 formed on the inner surface of the panel 5, when the width of the light absorption layer 3 in the long side direction of the panel 5 is 100%, the chip tolerance WK and other colors The ratio of the batting margin WT is as follows. Area S3 WK: WT = 45%: 55% While the color CRT 14 is operating, the above-mentioned doming occurs. The doming includes the local doming in which the shadow mask 6 locally deforms due to thermal expansion and the entire doming in which the entire shadow mask 6 deforms due to thermal expansion. The whole doming process is similar to the local doming described above.

When the local doming or the total doming occurs in the shadow mask 6, the shadow mask 6 undergoes thermal deformation due to thermal expansion as described above, and the shadow mask 6 moves to the inner surface side of the panel 5, The space between the inner surface of the panel 5 and the shadow mask 6 becomes narrower, and the electron beam 50 moves in the direction shown in FIG. Due to the above phenomenon, the red R, green G, and blue B electron beams 50 are accurately emitted to the red R, green G, and blue B phosphor elements 2 on the phosphor surface 1 formed on the inner surface of the panel 5. It will not collide and will cause a mislanding. Further, when a color television is installed, the electron beam 5 emitted from the electron gun 1 by geomagnetism depends on the orientation of the panel 5 of the color CRT 14.
When 0 is deflected, the position of projection on the phosphor screen 1 formed on the inner surface of the panel 5 is changed, and the electron beam 50 may be chipped from above the phosphor element 2 as shown in FIG.
The color cathode ray tube 14 is provided with an internal magnetic shield 10 for preventing deflection of the electron beam 50 emitted from the electron gun 11 by an external magnetic field such as terrestrial magnetism. However, it is necessary to prevent any influence of the external magnetic field such as terrestrial magnetism. Therefore, the above phenomenon occurs.

[0010]

Since the conventional color cathode ray tube is constructed as described above, the doming,
The trajectory of the electron beam emitted from the electron gun changes due to the influence of the external magnetic field such as the earth's magnetism, and red, green, red, green, and
There is a problem that the blue electron beam does not strike accurately, the electron beam is missing from the phosphor element, color shift occurs, and the image quality deteriorates.

The present invention has been made in order to solve the above-mentioned problems, and is a phosphor element for an electron beam, which is a color shift due to the doming of a shadow mask, the deflection of an electron beam by an external magnetic field such as geomagnetism, and the like. It is an object of the present invention to provide a phosphor screen structure of a color cathode ray tube capable of preventing the occurrence of cracks and the like from above.

[0012]

A color cathode-ray tube according to the present invention is a three-color phosphor unit in which red, green and blue phosphor elements formed in stripes are arranged side by side through a light absorption layer. A rectangular panel having a fluorescent screen in which a plurality of columns are arranged,
In a color CRT equipped with a funnel having red, green, and blue electron guns in the neck, and a shadow mask having apertures for transmitting electron beams emitted from the electron guns,
The arrangement pitch of the three-color phosphor units in the long side direction of the panel is Wp1, and the distance from the center of the blue phosphor element to the center of the red phosphor element in the three-color phosphor unit is WBR1.
Then, the BM arrangement rate = WBR1 / Wp1 × 150
The BM arrangement ratio obtained by (%) is 95% ≦ BM arrangement ratio ≦ 97% in the central part of the phosphor screen, and 97% <BM arrangement ratio <100% near both ends of the long side of the phosphor screen. is there.

The distance from the center of the phosphor screen formed on the inner surface of the rectangular panel to the long side end of the phosphor screen is 3
The BM arrangement ratio in the region outside the circle having a radius of / 4 is set to 97% <BM arrangement ratio <100%.
Further, the BM arrangement rate in the region inside the circle having a radius of 3/4 of the distance from the center of the phosphor screen formed on the inner surface of the rectangular panel to the long side end of the phosphor screen is 95% <B
The M arrangement rate is <97%.

Also, red, green, and
A rectangular panel having a phosphor screen in which a plurality of rows of three-color phosphor units in which blue phosphor elements are arranged side by side through a light absorption layer are arranged, and a funnel having red, green, and blue electron guns in the neck portion , And in a color cathode-ray tube equipped with a shadow mask having an aperture for transmitting an electron beam emitted from the electron gun, the electron beam emitted from the electron gun passes through the aperture provided in the shadow mask and is projected onto the phosphor screen. When striking, the electron beam is represented in the electron beam density distribution in the long side direction of the panel, and the width of the electron beam at 5% of the electron beam density distribution is defined as 100% at the apex of the electron beam density distribution. WB, the width of the striped phosphor element in the long side direction of the panel is WS, and the electron beam width on the phosphor screen obtained by WK = (WB-WS) / 2
K, the width of the light absorption layer in the long side direction of the panel is WBM, and the width of the light absorption layer obtained by WT = WBM-WK is another color hitting tolerance WT. The relationship of the hitting margin WT is WK <WT at the center of the phosphor screen,
In the vicinity of both ends of the long side of the phosphor screen, WK> WT.

Further, WK> WT is set in a region outside a circle having a radius of 3/4 of the distance from the center of the phosphor screen formed on the inner surface of the panel to the long side end of the phosphor screen.
Further, WK <WT is set in a region inside a circle whose radius is 3/4 of the distance from the center of the phosphor screen formed on the inner surface of the panel to the long side end of the phosphor screen.

Further, in the central portion of the phosphor screen formed on the inner surface of the panel, the width of the light absorption layer in the long side direction of the panel is 100.
%, The ratio of the chip tolerance and the tolerance of other colors is 20% ≦
(WT-1WK) ≦ 25%, and the ratio of the chip tolerance and the other-color striking tolerance in the vicinity of both ends of the long side of the phosphor screen is 20% ≦ (WK
One WT) ≦ 25%.

[0017]

[Embodiment]

Embodiment 1. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a characteristic diagram showing the rate of change in the BM alignment rate in the structure of the phosphor screen 1 formed on the inner surface of the panel 5 of the color cathode-ray tube 14 according to Embodiment 1 of the present invention. The overall configuration of the color cathode ray tube and the arrangement configuration of the phosphor screen are the same as those of the conventional example shown in FIGS. 2, 3 and 8, and therefore the description thereof will be omitted, and in the following description, FIGS. The code used in 8 is used as it is. In FIG. 1, the BM arrangement ratio indicating the relationship between the intervals of the phosphor elements 2 in the structure of the phosphor screen 1 is defined as a point 3 / 4P of the effective diameter P from the center PO of the phosphor screen 1 in the long side direction of the phosphor screen 1. It is configured by changing so that an inflection point is formed. Specifically, in FIG. 4, a circle having a radius of 3 / 4P of the distance from the center PO of the phosphor screen 1 formed on the inner surface of the panel 5 in the long side direction of the panel 5 to the end of the effective diameter P of the phosphor screen 1 In the range area S1, 95% ≦ BM arrangement rate ≦ 97%
In the area S2 outside the range, 97% <BM arrangement rate <
It is set to 100%.

Next, the operation of the above configuration will be described.
Due to the local doming of the shadow mask 6 and the thermal expansion of the shadow mask 6 to the phosphor screen 1 side of the inner surface of the panel 5, the red light emitted from the electron gun 11 has passed through the aperture 13 of the shadow mask 6. R, green G,
The respective electron beams 50 of blue B move as shown in FIG. 7C due to the relationship between the BM alignment rate and the beam alignment rate described above. Electron beam 5 typically by local doming
The movement amount of 0 is the shadow mask 6 by the local doming.
The maximum amount of thermal deformation is the maximum in the area S1 within the range from the center PO of the phosphor screen 1 to 3/4 P of the effective diameter P. Therefore, as in the embodiment shown in FIG.
Area S within the range from the center PO to the 3/4 P of the effective diameter P
By setting 1 to 95% ≦ BM arrangement ratio ≦ 97%, the interval WBR1 from the red R to the blue B of the phosphor elements 2 on the phosphor surface 1 is 2/3 of the arrangement pitch WP1 of the phosphor elements 2.
It becomes the following.

Therefore, when the widths of the red R, green G, and blue B phosphor elements 2 are constant in the long side direction of the phosphor screen 1, light absorption between the red R and green G phosphor elements 2 is performed. The width of the light absorption layer 3 between the red R and blue B phosphor elements 2 is the largest with respect to the width of the layer 3 and the width of the light absorption layer 3 between the green G and blue B phosphor elements 2. By setting the width of the light absorption layer 3 between the red R and blue B phosphor elements 2 to be the largest in the long side direction, local doming occurs in the shadow mask 6, and FIG.
Even if it moves as shown in (c), it moves the largest in the direction of the center PO of the phosphor screen 1 in the trio of the electron beams 50 of red R, green G, and blue B in the long side direction of the phosphor screen 1. Depending on the amount of movement of the electron beam 50, specifically, the blue B electron beam 50 in the left half of the phosphor screen and the red R electron beam 50 in the right half of the phosphor screen, the distance between the red R and blue B phosphor elements 2 is determined. Since the width of the light absorption layer in the long side direction of the phosphor screen 1 is large, color misregistration does not occur.

In addition, in the vicinity of the short side portion of the panel 5, the electron beam 50 is easily deflected by an external magnetic field such as geomagnetism, and in the area S2 outside the range 3 / 4P of the effective diameter P from the center PO of the phosphor screen 1. The amount of deflection of the electron beam 50 due to geomagnetism is the largest. As in the embodiment of FIG. 1, by setting the out-of-range region S2 from the center PO of the phosphor screen 1 to 3/4 P of the effective diameter P to 97% <BM arrangement ratio <100%, on the phosphor screen 1. The interval WBR1 from red R to blue B of the phosphor elements 2 is approximately 2/3 of the arrangement pitch WP1 of the phosphor elements 2. Therefore, when the widths of the red R, green G, and blue B phosphor elements 2 are constant in the long side direction of the phosphor screen 1, the light absorption layer 3 between the red R and green G phosphor elements 2 is formed. The width, the width of the light absorption layer 3 between the green G and blue B phosphor elements 2, and the light absorption layer 3 between the red R and blue B phosphor elements 2 are set to be substantially equal. Since the widths in the long side direction of the phosphor screen 1 of the light absorption layer 3 between the phosphor elements 2 of red R, green G, and blue B are substantially equal to each other, even if the electron beam 50 is deflected by the external magnetic field, No deviation occurs. Therefore,
It is possible to obtain high quality images.

Embodiment 2 FIG. Hereinafter, another embodiment of the present invention will be described. In FIG. 4, an area S1 within a circle whose radius is 3 / 4P of the distance from the center PO of the fluorescent screen 1 formed on the inner surface of the panel 5 in the long side direction of the panel 5 to the end of the effective diameter P of the fluorescent screen 1. Then, chip margin WK and other color striking margin WT
Is set to WK <WT, and in the out-of-range area S2, the ratio of the chipping tolerance WK to the other-color hitting tolerance WT is set to WK> WT.

When the width of the light absorption layer 3 in the long side direction of the panel 5 is 100% in the entire phosphor screen 1 formed on the inner surface of the panel 5, the chip margin WK in the regions S1 and S2 is set. The ratio of the other color hitting tolerance WT is configured as follows as an example. Area S1 WK: WT 40%: 60% Area S2 WK: WT 60%: 40%

Next, the operation of the above configuration will be described.
When the shadow mask 6 is subjected to doming or local doming, the space between the fluorescent screen 1 on the inner surface of the panel 5 and the shadow mask 6 changes. Particularly, in the area S1 within a circle having a radius of 3 / 4P of the distance from the center PO of the phosphor screen 1 to the end of the effective diameter P of the phosphor screen 1 in the long side direction of the panel 5, the phosphor screen 1 on the inner surface of the panel 5 The change in the distance between the shadow mask 6 and the shadow mask 6 is the largest. When the local doming occurs in the shadow mask 6, the electron beam 50 emitted from the electron gun 11 is emitted.
On the phosphor screen 1 as described above.
It changes as shown in FIG. On the fluorescent screen 1, for the region S1, the chip margin WK is set on the panel 5 as described above.
40% of the width of the light absorption layer 3 in the long side direction of the electron beam 5
Since the width of 0 is made small, the electron beam that moves most in the direction of the center PO of the phosphor screen 1 in the trio of the electron beams 50 of red R, green G, and blue B in the long side direction of the phosphor screen 1. 50, specifically, even if the blue electron beam 50 in the left half of the phosphor screen and the red electron beam 50 in the right half move toward the center PO of the phosphor screen 1,
Since 0% ≦ (WT-1WK) ≦ 25%, no color misregistration occurs.

In the vicinity of the short side of the panel 5, the electron beam 50 is easily deflected by an external magnetic field such as geomagnetism, and the amount of deflection of the electron beam 50 by geomagnetism is the largest in the region S2. On the other hand, in the region S2, as in the above example, 20% ≦ (WK1WT) ≦ 25%, so that even if the electron beam 50 is deflected by the external magnetic field, red R, green G, and blue B No chipping of the electron beam 50 occurs on each phosphor element 2 as shown in FIG. Therefore,
It is possible to obtain high quality images.

[Brief description of drawings]

FIG. 1 is a characteristic diagram showing a BM arrangement rate in a fluorescent screen structure of a color cathode-ray tube according to Embodiment 1 of the present invention.

FIG. 2 is an array diagram of phosphor elements forming a phosphor screen.

FIG. 3 is an array diagram of electron beams on a fluorescent screen.

FIG. 4 is an explanatory view showing a structure of a fluorescent screen formed on the inner surface of the panel of the color CRT according to the second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a general relationship among a phosphor element forming a phosphor screen formed on an inner surface of a panel, a light absorption layer, and an electron beam according to a second embodiment.

FIG. 6 is a characteristic diagram showing a density distribution of an electron beam.

FIG. 7 is an explanatory diagram showing a moving direction of an electron beam due to doming of a shadow mask.

FIG. 8 is a partially cutaway side view of a general color CRT.

FIG. 9 is a persuasive diagram showing a state where an electron beam is missing.

FIG. 10 is an explanatory diagram of a doming occurrence principle.

FIG. 11 is an explanatory diagram showing a structure of a phosphor screen formed on the inner surface of a panel of a conventional color CRT.

[Explanation of symbols]

1 phosphor screen, 2 phosphor element, 3 light absorption layer, 5 panel, 6 shadow mask, 9 funnel, 9a neck part, 13 aperture, 14 color cathode ray tube, 50 electron beam.

Claims (7)

[Claims] 1. A rectangular panel having a phosphor screen in which a plurality of rows of three-color phosphor units in which stripe-shaped phosphor elements of red, green, and blue are arranged in parallel via a light absorption layer are arranged. A funnel having red, green, and blue electron guns in the neck portion, and a color cathode-ray tube having a shadow mask having apertures for transmitting electron beams emitted from the electron guns, in the long side direction of the panel. When the arrangement pitch of the three-color phosphor unit is Wp1 and the distance from the center of the blue phosphor element to the center of the red phosphor element in the three-color phosphor unit is WBR1, the BM arrangement ratio = W
BM calculated by BR1 / Wp1 × 150 (%)
The arrangement ratio is 95% ≦ BM arrangement ratio ≦ 97% in the central part of the phosphor screen, and 97% <B near both ends of the long side of the phosphor screen.
A color cathode ray tube characterized by having an M arrangement rate of <100%. 2. 3/4 of the distance from the center of the phosphor screen formed on the inner surface of the rectangular panel to the end of the long side of the phosphor screen.
The BM arrangement ratio in the area outside the circle whose radius is
The color cathode ray tube according to claim 1, wherein 7% <BM arrangement ratio <100%. 3. 3/4 of the distance from the center of the phosphor screen formed on the inner surface of the rectangular panel to the end of the long side of the phosphor screen.
The BM arrangement ratio in the area inside the circle whose radius is
The color cathode ray tube according to claim 1, wherein 5% <BM arrangement ratio <97%. 4. A rectangular panel having a phosphor screen in which a plurality of three-color phosphor unit bodies in which stripe-shaped red, green, and blue phosphor elements are arranged in parallel through a light absorption layer are arranged. An electron beam emitted from an electron gun in a color cathode-ray tube having a funnel having red, green, and blue electron guns at the neck and a shadow mask having an aperture for transmitting the electron beam emitted from the electron gun. When passing through the aperture provided in the shadow mask and impinging on the phosphor screen, the electron beam is represented by an electron beam density distribution in the long side direction of the panel, and the apex of this electron beam density distribution is 100%. Where WB is the width of the electron beam at 5% of the electron beam density distribution, WS is the width of the striped phosphor element in the long side direction of the panel, and WK = (WB-
WS) / 2, where the electron beam width on the phosphor screen is lacking, the margin is WK, and the width of the light absorption layer in the long side direction of the panel is WBM. WT = WBM-WK When the width of the light absorption layer is set to the other color hitting tolerance WT,
The relationship between the chip tolerance WK and the tolerance for hitting another color WT is WK <WT at the center of the phosphor screen, and WK> near both ends of the long side of the phosphor screen.
Color cathode ray tube characterized by being WT. 5. A region outside a circle whose radius is 3/4 of the distance from the center of the phosphor screen formed on the inner surface of the panel to the end of the long side of the phosphor screen is WK> WT. The color cathode ray tube according to claim 4. 6. A region inside a circle whose radius is 3/4 of the distance from the center of the phosphor screen formed on the inner surface of the panel to the long side edge of the phosphor screen is WK <WT. The color cathode ray tube according to claim 4. 7. The center of the phosphor screen formed on the inner surface of the panel has a ratio of the chip tolerance to the other color striking tolerance when the width of the light absorption layer in the long side direction of the panel is 100%. % ≤ (W
T1 WK) ≦ 25%, and in the vicinity of both ends of the long side of the phosphor screen, the ratio of the chip tolerance and the tolerance of other colors is 20% ≦ (WK-1W
The color cathode ray tube according to claim 4, wherein T) ≤ 25%.