JP2004265790A - Mask supporting frame and color cathode-ray tube equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress formation of "wrinkles" of a shadow mask to be bridged and retained by making small the gap per unit length of stress distribution in longitudinal direction inherent in a first frame constituting member constituting the long side, in a state the shadow mask is bridged and retained. <P>SOLUTION: A second frame constituting member 14 is composed of a second frame constituting member main body 14a to constitute the short side, and a extended part 14b extended in roughly right-angl to the second frame constituting member body 14a in the same direction from both edges of the second frame constituting member body 14a. A fixing part is formed in one part including a free end of the extended part 14b, and the fixing part is fixed between the end part of the first frame constituting member 7 and the center part. The cross sectional area of the face orthogonally crossing in the longitudinal direction of the fixing part to the first frame constituting member 7 of the second frame constituting member 14 is gradually made smaller toward the free end of the extended part 14b. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a color cathode ray tube used for a television receiver, a computer display, and the like, and a mask support frame for supporting a shadow mask used for the color cathode ray tube.
[0002]
[Prior art]
FIG. 6 shows a basic configuration of a general color cathode ray tube used for a television receiver or the like. As shown in FIG. 6, a color cathode ray tube generally has a phosphor screen surface 2a on the inner surface thereof, and has a substantially rectangular face panel 2 and a funnel 3 connected to the rear of the face panel 2. , An electron gun 4 built in the neck 3a of the funnel 3, and a predetermined distance from the phosphor screen surface 2a on the inner surface of the face panel 2 at a predetermined position in the bulb. A shadow mask 6 for regulating the arrival position of the electron beam emitted from the electron gun 4 and a mask support frame 19 for holding and fixing the shadow mask 6 are provided. A deflection yoke 5 for deflecting the electron beam emitted from the electron gun 4 in the vertical and horizontal directions is provided on the outer periphery of the funnel 3 on the neck 3a side.
[0003]
The shadow mask 6 plays a role of color selection for three electron beams emitted from the electron gun 4 and corresponding to R (red), G (green), and B (blue) colors. Are formed by etching a large number of substantially slot-shaped openings that are electron beam passage holes. In FIG. 6, A indicates the trajectory of the electron beam.
[0004]
The mask support frame 19 forms a long side, and connects the pair of upper and lower first frame components 7 to which the shadow mask 6 is fixed, and the ends on the same side of the pair of first frame components 7. And a pair of left and right second frame components 8 forming short sides, which are joined to the first frame component 7 by welding. The mask support frame 19 and the shadow mask 6 fixed thereto form a shadow mask structure 9. In this case, the mask support frame 19 is compressed by applying a compressive force from the outside of the pair of upper and lower first frame components 7, and the shadow mask 6 is moved in a state where a tensile force is applied to the shadow mask 6. By fixing to the one frame component 7 and then removing the compressive force, tension is applied to the shadow mask 6 (stretch type mask).
[0005]
A pair of upper and lower first frame components 7 constituting the long sides of the mask support frame 19 are provided with plate-like spring attachment members 21 respectively, and the spring members 10 are fixed to these spring attachment members 21. Here, the mounting hole 10 a of the spring member 10 is located at the center of the first frame component 7 or in the vicinity thereof. Further, a pair of left and right second frame components 8 constituting the short sides of the mask support frame 19 are provided with spring mounting members 11, respectively, and a spring member 12 is fixed to these spring mounting members 11. Here, the mounting hole 12 a of the spring member 12 is located at the center of the second frame component 8 or in the vicinity thereof. To fix the shadow mask structure 9 to the face panel 2, the mounting holes 10 a of the spring member 10 are engaged with pins 13 planted above and below the inner surface of the face panel 2, and the mounting holes 12 a of the spring member 12 are fixed. Is locked to pins (not shown) implanted on the left and right sides of the inner surface of the face panel 2. At this time, the pair of left and right second frame components 8 constituting the short sides of the mask support frame 19 are compressed by the compressive force applied to the pair of upper and lower first frame components 7 when the shadow mask 6 is fixed. It is in a state of being curved toward the gun 4 side.
[0006]
By the way, in a color cathode ray tube using a shadow mask (stretched type mask) 6 to which tension (tension) is applied, the tension is reduced due to thermal expansion of the shadow mask 6 due to the impact of an electron beam, and the shadow mask structure 9 (the effect of the pair of left and right second frame members 8 trying to extend straight from the state curved toward the electron gun 4) to the shadow mask 6 with respect to the phosphor screen surface 2a. "Shadow mask misalignment" occurs in the direction. As a result, a so-called doming phenomenon occurs in which an electron beam passing through the electron beam passage hole does not properly hit a predetermined phosphor and color unevenness occurs.
[0007]
For this reason, as shown in FIG. 7, the second frame component main body 17a constituting the short side and the second frame component main body 17a extend substantially perpendicularly in the same direction from both ends of the second frame component main body 17a. A technique has been proposed in which a shadow mask structure 18 is configured using a pair of left and right second frame components 17 having an extension portion 17b (for example, see Patent Document 1). In this case, the free end of the extension 17b of the second frame component 17 is fixed by welding between the end and the center of the first frame component 7 forming the long side. The use of the shadow mask structure 18 configured as described above can reduce the “shadow mask misalignment” as described below. That is, when the shadow mask structure 18 is used, even if a compressive force is applied to the pair of upper and lower first frame components 7 when the shadow mask 6 is fixed, the extension portion 17b bends. The stress in the tube axis direction generated in the frame member main body 17a is absorbed by the extending portion 17b, and the second frame member main body 17a is not so much bent toward the electron gun 4 side. Therefore, even if the tension is reduced by thermal expansion of the shadow mask 6 due to the impact of the electron beam, the shadow mask 6 is not so far away from the phosphor screen surface 2a in the tube axis direction, so that color unevenness occurs. Can be suppressed. Also, if this shadow mask structure 18 is used, the distribution of the tensile force of the shadow mask 6 in the longitudinal direction of the pair of first frame components 7 constituting the long side can be easily made to be mountain-shaped, and the vibration of the shadow mask 6 can be shadowed. The free end of the mask 6 makes it easier to suppress.
[0008]
[Patent Document 1] JP-A-6-36703
[Problems to be solved by the invention]
However, the color cathode ray tube having the above-mentioned conventional shadow mask structure has the following problems. That is, in the conventional mask supporting frame constituting the shadow mask structure 18, since the rigidity of the portion where the second frame component 17 is fixed to the first frame component 7 is locally increased, the shadow mask 6 is In the state of being stretched and held on the mask support frame, the stress distribution in the longitudinal direction existing in the first frame component 7 constituting the long side includes a component (undulation) of a fourth-order function or more. For this reason, when the tension is reduced due to the thermal expansion of the shadow mask 6 after the heat treatment step in manufacturing the cathode ray tube and during the operation of the completed cathode ray tube (when the electron beam is projected on the shadow mask 6). In addition, the restoration of the mask support frame becomes uneven, and there is a problem that "wrinkles" occur in the tension direction of the shadow mask 6 at the portion where the second frame component 17 is fixed to the first frame component 7.
[0010]
The present invention has been made to solve the above-mentioned problem in the prior art, and has a stress distribution in a longitudinal direction of a first frame component constituting a long side in a state where a shadow mask is stretched and held. It is an object of the present invention to provide a mask supporting frame capable of suppressing the occurrence of "wrinkles" of a shadow mask held and stretched by reducing a drop per unit length, and a color cathode ray tube including the same. .
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the configuration of the mask support frame according to the present invention includes a pair of first frame constituent members forming long sides,
A second frame component member main body constituting a short side, and an extending portion extending from the both ends of the second frame component member main body at substantially right angles to the second frame component member main body in the same direction; A mask support frame comprising a pair of second frame components fixed at a portion including a free end of the portion between an end portion and a central portion of the first frame component,
A cross-sectional area of a surface orthogonal to the longitudinal direction of at least a portion including a portion fixed to the first frame component of the extension portion is a surface orthogonal to the longitudinal direction of the second frame component other than the portion. Is smaller than the cross-sectional area.
[0012]
According to the configuration of the mask support frame, it is possible to suppress a local increase in rigidity at a portion where the second frame component is fixed to the first frame component, so that the shadow mask is stretched and held. In this state, a drop per unit length of the stress distribution in the longitudinal direction, which is present in the first frame constituting member constituting the long side, can be reduced. As a result, after the heat treatment step in manufacturing the cathode ray tube, and when the tension of the completed cathode ray tube is reduced due to the thermal expansion of the shadow mask during the operation of the completed cathode ray tube (at the time of electron beam impact on the shadow mask), The restoration of the mask supporting frame can be made uniform, and the occurrence of "wrinkles" of the shadow mask that is stretched and held can be suppressed.
[0013]
Further, in the configuration of the mask support frame of the present invention, the cross-sectional area of a portion of the extension portion where the cross-sectional area of a surface orthogonal to the longitudinal direction is small is a free end of the extension portion. Preferably, it gradually decreases toward.
[0014]
Further, in the configuration of the mask support frame of the present invention, in the extending portion, a portion in which a cross-sectional area of a surface orthogonal to the longitudinal direction is small, and the two in the longitudinal direction of the extending portion. It is preferable that the cross-sectional area of a surface perpendicular to both directions of the free end of the extension part gradually decreases toward the inside of a line connecting the free ends of the two extension parts.
[0015]
Further, in the configuration of the mask support frame of the present invention, in the extending portion, a portion in which a cross-sectional area of a surface orthogonal to the longitudinal direction is small, and the two in the longitudinal direction of the extending portion. It is preferable that the cross-sectional area of a surface orthogonal to both directions of connecting the free ends of the extending portions gradually decreases toward the outside of a line connecting the free ends of the two extending portions.
[0016]
According to these preferred examples, in addition to being able to suppress the occurrence of "wrinkles" of the shadow mask that is stretched and held, it is also possible to avoid a sudden change in the cross section of the second frame component member. It is possible to prevent local stress concentration of the second frame component in a state where the mask is stretched and held. As a result, thermal deformation of the second frame component caused by stress concentration can be reduced, so that productivity can be improved (yield can be improved). Further, according to these preferred examples, the cross-sectional area of at least a portion of the extension portion including the portion fixed to the first frame component, which is orthogonal to the longitudinal direction, is changed to the second frame component other than the portion. When the cross-sectional area is smaller than the cross-sectional area of the surface orthogonal to the longitudinal direction, the cut portion of the second frame member becomes a flat surface, and the process is facilitated, so that the process can be simplified.
[0017]
Further, the configuration of the color cathode ray tube according to the present invention, a face panel having a phosphor screen surface made of a plurality of color phosphors on the inner surface, a bulb comprising a funnel connected behind the face panel,
An electron gun built into the neck of the funnel;
A shadow having a plurality of electron beam passage holes for allowing an electron beam emitted from the electron gun to pass therethrough, and being disposed at a predetermined position in the bulb at a predetermined distance from the phosphor screen surface A mask,
A color cathode ray tube comprising a mask support frame for holding and fixing the shadow mask in a state where a constant tension is applied to the shadow mask,
The mask support frame of the present invention is used as the mask support frame, and the shadow mask is stretched and held between a pair of the first frame components.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described more specifically with reference to embodiments.
[0019]
The basic configuration of the color cathode ray tube in the present embodiment is the same as that of the general color cathode ray tube shown in FIG. 6, and therefore, the present embodiment will be described with reference to FIG.
[0020]
FIG. 1 is a perspective view showing a mask supporting frame according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a second frame constituting member constituting a short side of the mask supporting frame according to the present embodiment.
[0021]
As shown in FIG. 6, the color cathode ray tube 1 in the present embodiment has a phosphor screen surface 2a on the inner surface, and is connected to a face panel 2 made of glass or the like and behind the face panel 2; A bulb consisting of a funnel 3 made of glass or the like, an electron gun 4 built in a neck 3a of the funnel 3, and a phosphor screen surface 2a on the inner surface of the face panel 2 are kept at a predetermined distance from the bulb. A shadow mask 6 for regulating the arrival position of the electron beam emitted from the electron gun 4, and a mask support frame 20 for holding and fixing the shadow mask 6. Here, the shadow mask 6 plays a role of color selection for three electron beams emitted from the electron gun 4 and corresponding to R (red), G (green), and B (blue) colors. It is formed by forming a large number of substantially slot-shaped openings, which are electron beam passage holes, in a flat plate by etching. A deflection yoke 5 for deflecting the electron beam emitted from the electron gun 4 in the vertical and horizontal directions is provided on the outer periphery of the funnel 3 on the neck 3a side.
[0022]
As shown in FIGS. 1 and 6, the mask support frame 20 has a long side, and a pair of upper and lower first frame components 7 to which the shadow mask 6 is fixed, and a short side. A pair of left and right second frame components 14 are fixed to the first frame component 7 by welding so that the frame components 7 remain parallel.
[0023]
The first frame component member 7 constituting the long side is formed by extracting a coiled iron material having a plate thickness of 3 to 6 mm and performing a bending process so as to have an L-shaped cross section. The present invention is not limited to this, and it can also be formed by subjecting a plate-shaped iron material to press punching and then performing bending.
[0024]
As shown in FIGS. 1 and 2, the second frame component 14 is made of a quadrangular prism made of an iron material having a cross section of 14 to 16 mm × 14 to 16 mm, and has a short side. The main body 14a is composed of an extension portion 14b that extends from both ends of the second frame component member body 14a in the same direction at substantially right angles to the second frame component member body 14a. A fixing portion 16 for fixing the second frame component 14 to the first frame component 7 is formed in a part including the free end of the extension portion 14b. The fixing portion 16 is fixed between the end portion and the center portion of the first frame component 7, and in a state where the second frame component 14 is fixed to the first frame component 7, the extending portion 14 b One frame component 7 is in a state of extending inward from the end.
[0025]
Here, the length of the second frame component main body 14a is 200 to 500 mm, the length of the extension 14b is 100 to 200 mm, and the length of the first frame component 7 is the length of the extension 14b. It is about 2 to 5 times. These lengths differ depending on the screen size of the color cathode ray tube.
[0026]
Also, the cross-sectional area of the surface orthogonal to the longitudinal direction of the portion of the second frame component 14 fixed to the first frame component 7 is the surface of the surface orthogonal to the longitudinal direction of the second frame component 14 other than the fixed portion. It is smaller than the cross-sectional area. Specifically, as shown in FIGS. 1 and 2, the cross-sectional area of a surface orthogonal to the longitudinal direction of the fixing portion gradually decreases toward the free end of the extension 14 b. According to this configuration, it is possible to avoid a sudden change in the cross section of the second frame component 14, so that the local stress concentration of the second frame component 14 in a state where the shadow mask 6 is stretched and held. Can be prevented. As a result, the thermal deformation of the second frame member 14 caused by the stress concentration can be reduced, so that the productivity (yield) can be improved. Further, according to this configuration, the cross-sectional area of a surface orthogonal to the longitudinal direction of the portion of the second frame component 14 fixed to the first frame component 7 is set to the longitudinal direction of the second frame component 14 other than the fixed portion. In the case where the cross-sectional area is smaller than the cross-sectional area of the surface orthogonal to the direction, the cutting portion of the fixed portion becomes a flat surface, which facilitates the processing, so that the processing step can be simplified.
[0027]
The first frame component 7 that forms the long side of the mask support frame 20 has an L-shaped cross section on a surface orthogonal to the longitudinal direction, and is provided on the upper surface 7a of the pair of upper and lower first frame components 7. The shadow mask structure 15 is configured by fixing the shadow mask 6. In FIG. 1, the illustration of the shadow mask 6 is omitted.
[0028]
A pair of first frame components 7 constituting the long sides of the mask support frame 20 are provided with plate-shaped spring attachment members 21 respectively, and the spring members 10 are fixed to these spring attachment members 21. Here, the mounting hole 10 a of the spring member 10 is located at the center of the first frame component 7 or in the vicinity thereof. The spring member 12 is fixed to the pair of second frame components 14 of the mask support frame 20. Here, the mounting hole 12a of the spring member 12 is located at or near the center of the second frame component main body 14a that forms the short side. To fix the shadow mask structure 15 to the face panel 2, the mounting holes 10 a of the spring member 10 are engaged with the pins 13 planted above and below the inner surface of the face panel 2, and the mounting holes 12 a of the spring member 12 are fixed. Is locked to pins (not shown) implanted on the left and right sides of the inner surface of the face panel 2.
[0029]
The inventor of the present invention has proposed a shadow mask structure (length of the second frame component member: 250 mm, length of the extended portion: 107 mm, length of the first frame component 7: The length of the protrusion is about 4.5 times, and the material of the first frame component 7 and the material of the second frame component are both chrome molybdenum steel) and are inherent in the first frame component 7 constituting the long side. The longitudinal stress distribution was examined. The shadow mask 6 is applied with a tension (tension) such that the tension distribution becomes a mountain shape in which the tension distribution becomes smaller from the center to the periphery. FIG. 3 shows the result. FIG. 3 shows the relationship between the distance from the center of the first frame component 7 constituting the long side and the stress. In FIG. 3, the solid line represents the stress distribution inherent in the first frame component 7 of the present invention (this embodiment), and the broken line represents the stress distribution inherent in the first frame component 7 of the prior art. Represents.
[0030]
As shown in FIG. 3, in both the present invention and the prior art, the stress distribution is generated at the center of the first frame component 7 at the portion where the second frame component is fixed to the first frame component 7 (frame fixing region). It is considered that the occurrence of "wrinkles" in the shadow mask 6 stretched and held can be suppressed by flattening the stress distribution particularly in the frame fixing region.
[0031]
Looking at the stress distribution inherent in the first frame component 7 according to the prior art shown by the broken line in FIG. 3, the stress change in the frame fixing region is large. In particular, in a region at the end 10 mm (a region of 130 to 140 mm in FIG. 3) of the frame fixing region where “wrinkles” easily occur, 8.0 kgf / mm ² (= 7.84 × 10 ⁷ N / m ² ). The change in stress has occurred.
[0032]
On the other hand, looking at the stress distribution inherent in the first frame constituting member 7 according to the present invention shown by the solid line in FIG. 0.7 kgf / mm ² (= 6.57 × 10 ⁷ N / m ² ). Therefore, according to the present invention, an improvement effect of about 16% is obtained as compared with the prior art. That is, according to the present invention, in the state in which the shadow mask 6 is stretched and held, the drop per unit length of the longitudinal stress distribution in the first frame component member 7 constituting the long side is reduced. can do.
[0033]
In the present invention, the above-mentioned improvement effect is obtained because the cross-sectional area of the surface orthogonal to the longitudinal direction of the fixed portion of the second frame component 14 to the first frame component 7 is set to a value other than the fixed portion. This is because, by making the cross-sectional area smaller than the surface orthogonal to the longitudinal direction of the second frame component member 14, the rigidity at the fixed portion locally increases. By obtaining such an improvement effect, the shadow mask 6 can be removed after the heat treatment step when manufacturing the cathode ray tube and during the operation of the completed cathode ray tube (when the electron beam is projected on the shadow mask 6). When the tension is reduced due to thermal expansion, the restoration of the mask support frame 20 is made uniform, and the occurrence of "wrinkles" of the shadow mask 6 that is stretched and held can be suppressed.
[0034]
The displacement of the shadow mask structure in the tube axis direction due to the thermal expansion of the shadow mask 6 which causes color unevenness is 10 μm in both the present invention and the prior art, and the same effect as that of the prior art can be obtained in the present invention. Have been.
[0035]
Further, in the present invention, the area of the fixing portion 16 is set to approximately 15 mm × 30 mm = approximately 450 mm ² , which is equivalent to that of the related art, and the first frame of the second frame constituting member 14 in a state where the shadow mask is stretched and held. The stress concentration at the boundary between the first frame component 7 and the second frame component 14 at the portion fixed to the component 7 is reduced as in the prior art.
[0036]
In the above embodiment, the cross-sectional area of the surface orthogonal to the longitudinal direction of the portion of the second frame component 14 fixed to the first frame component 7 gradually increases toward the free end of the extension 14b. The configuration is such that the cross-sectional area is reduced, but the cross-sectional area only needs to be smaller than the cross-sectional area of a surface other than the fixing portion and orthogonal to the longitudinal direction of the second frame component member 14. Therefore, for example, the following configuration can be adopted. That is, as shown in FIG. 4, the cross-sectional area of a surface of the fixed portion orthogonal to both the longitudinal direction of the extending portion 14b and the direction connecting the free ends of the two extending portions 14b is equal to the two extending portions 14b. May be adopted such that the width gradually decreases toward the inside of the line segment connecting the free ends. As shown in FIG. 5, the cross-sectional area of a surface of the fixed portion orthogonal to both the longitudinal direction of the extending portion 14b and the direction connecting the free ends of the two extending portions 14b is equal to the two extending portions 14b. May be adopted such that the width gradually decreases toward the outside of the line connecting the free ends.
[0037]
Further, in the above embodiment, the cross-sectional area of a surface orthogonal to the longitudinal direction of the fixed portion of the second frame component 14 to the first frame component 7 is determined by the cross-sectional area of the second frame component 14 other than the fixed portion. Although the cross-sectional area is smaller than the cross-sectional area of the surface orthogonal to the longitudinal direction, the cross-sectional area of the surface orthogonal to the longitudinal direction of at least the portion including the fixing portion of the extension portion 14b is the second frame other than that portion. Any configuration may be used as long as it is smaller than the cross-sectional area of a plane orthogonal to the longitudinal direction of the component member 14. In this case, it is desirable that the length in the longitudinal direction of the extension portion 14b of the portion including the fixed portion excluding the fixed portion is 50 to 100 mm.
[0038]
【The invention's effect】
As described above, according to the present invention, the cross-sectional area of at least a portion of the extension portion including the portion fixed to the first frame component, which is orthogonal to the longitudinal direction, is set to the second frame other than the portion. By making it smaller than the cross-sectional area of a surface orthogonal to the longitudinal direction of the constituent member, it is possible to suppress the rigidity at the fixed portion from locally increasing, so that the shadow mask is stretched and held, It is possible to reduce a drop per unit length of a stress distribution in the longitudinal direction which is present in the first frame constituting member constituting the long side. As a result, after the heat treatment step in manufacturing the cathode ray tube, and when the tension of the completed cathode ray tube is reduced due to the thermal expansion of the shadow mask during the operation of the completed cathode ray tube (at the time of electron beam bombardment on the shadow mask), The restoration of the mask support frame can be made uniform, and the occurrence of "wrinkles" of the shadow mask that is stretched and held can be suppressed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a mask supporting frame according to an embodiment of the present invention; FIG. 2 is a perspective view showing a second frame constituting member constituting a short side of the mask supporting frame according to an embodiment of the present invention; FIG. 3 is a diagram showing a stress distribution in a longitudinal direction of a first frame component constituting a long side of a mask support frame in a state where a shadow mask is stretched and held according to an embodiment of the present invention. 4 is a perspective view showing another example of the second frame constituting member constituting the short side of the mask supporting frame in one embodiment of the present invention. FIG. 5 is a short side of the mask supporting frame in one embodiment of the present invention. FIG. 6 is a perspective view showing still another example of the second frame constituting member of FIG. 6. FIG. 6 is a sectional view showing the basic structure of the color cathode ray tube. FIG. 7 is a perspective view showing a mask support frame in the prior art. Description]
DESCRIPTION OF SYMBOLS 1 Color cathode ray tube 2 Face panel 2a Phosphor screen surface 3 Funnel 3a Neck 4 Electron gun 6 Shadow mask 7 First frame component 14 Second frame component 14a Second frame component main body 14b Extension 16 Fixing portion 20 Mask support frame

Claims (5)

A pair of first frame constituent members forming a long side,
A second frame component member main body constituting a short side, and an extending portion extending from the both ends of the second frame component member main body at substantially right angles to the second frame component member main body in the same direction; A mask support frame comprising a pair of second frame components fixed at a portion including a free end of the portion between an end portion and a central portion of the first frame component,
A cross-sectional area of a surface orthogonal to the longitudinal direction of at least a portion including a portion fixed to the first frame component of the extension portion is a surface orthogonal to the longitudinal direction of the second frame component other than the portion. A mask supporting frame having a cross-sectional area smaller than that of the mask supporting frame. 2. The mask according to claim 1, wherein the cross-sectional area of a portion of the extension that has a smaller cross-sectional area on a surface orthogonal to the longitudinal direction gradually decreases toward a free end of the extension. Support frame. Of the extending portion, a portion having a smaller cross-sectional area of a surface orthogonal to the longitudinal direction is orthogonal to both the longitudinal direction of the extending portion and the direction connecting the free ends of the two extending portions. The mask supporting frame according to claim 1, wherein a cross-sectional area of the surface gradually decreases inward of a line connecting the free ends of the two extending portions. Of the extending portion, a portion having a smaller cross-sectional area of a surface orthogonal to the longitudinal direction is orthogonal to both the longitudinal direction of the extending portion and the direction connecting the free ends of the two extending portions. The mask supporting frame according to claim 1, wherein a cross-sectional area of the surface gradually decreases toward an outside of a line connecting the free ends of the two extending portions. A face panel having a phosphor screen surface composed of a plurality of color phosphors on an inner surface thereof, and a bulb including a funnel connected to the back of the face panel,
An electron gun built into the neck of the funnel;
A shadow having a plurality of electron beam passage holes for allowing an electron beam emitted from the electron gun to pass therethrough, and being disposed at a predetermined position in the bulb at a predetermined distance from the phosphor screen surface A mask,
A color cathode ray tube comprising a mask support frame for holding and fixing the shadow mask in a state where a constant tension is applied to the shadow mask,
A color cathode ray, wherein the mask support frame according to any one of claims 1 to 4 is used as the mask support frame, wherein the shadow mask is stretched and held between a pair of the first frame components. tube.

Images