JP2007173004A - Explosion-proof color picture tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an explosion-proof color picture tube with substantial explosion-proof properties, without fear of generating positional shift of a horizontal-direction center axis of the picture tube from that of a TV cabinet. <P>SOLUTION: A panel 4 having a front part 2 and a side wall part 3 with a phosphor screen 14 formed on an inside face and a funnel 5 are jointed, and an explosion-proof band 22 is mounted on the panel 4 so as to surround the front part 2 and the side wall parts 3. The explosion-proof band 22 is provided with a convex part 23 extended in a length direction of the band at an area further toward a front part 2 side than an interface 21 between the front part 2 and the side wall part 3, except for either end side of the band in a width direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an explosion-proof color picture tube.

  A conventional explosion-proof color picture tube will be described with reference to FIGS.

  The explosion-proof color picture tube 80 includes at least an envelope 81 and an explosion-proof band 72.

  The envelope 81 includes a substantially rectangular glass panel 54 having a front portion 52 and a side wall portion 53 having a phosphor screen 51 formed on the inner surface, and a funnel-shaped glass funnel joined to the side wall portion 53. 55. The phosphor screen 51 includes a light absorption layer 62 formed in a plurality of stripes, and three-color phosphor layers 63R, 63G, and 63B that are sequentially embedded between the stripes of the light absorption layer 62. Opposite to the phosphor screen 51, a substantially rectangular shadow mask 60 is provided. The shadow mask 60 is formed with a plurality of slit-shaped electron beam passage holes (openings) 61 and a curved main surface portion 65 facing the phosphor screen 51, and is bent with respect to the main surface portion 65. The skirt portion 66 is provided around the surface portion 65. The skirt portion 66 of the shadow mask 60 is welded to a frame 68 having a substantially rectangular frame shape. A shadow mask structure 67 composed of a shadow mask 60 and a frame 68 has a substantially wedge-shaped elastic support body 69 attached to the outer wall surface of the four corner portions of the frame 68, and the side wall portion 53 of the four corner portions of the panel 54. By being locked to a stud pin 70 planted on the inner wall surface, it is detachably supported inside the panel 54.

  An electron gun 57 that emits three electron beams 58R, 58G, and 58B is disposed in the neck 56 at the small diameter end of the funnel 55. The three electron beams 58R, 58G, and 58B emitted from the electron gun 57 are deflected by a deflecting device 59 mounted on the outer peripheral surface of the funnel 55, and the phosphor screen is passed through the electron beam passage hole 61 of the shadow mask 60. A color image is displayed by scanning 51 in the horizontal direction and the vertical direction.

  At the boundary between the front portion 52 and the side wall portion 53 of the panel 54, a line formed by a joint portion of the mold used when molding is performed (mold match line, hereinafter referred to as “MML”). 71 is continuously formed over the entire circumference. The outer diameter of the panel 54 is the same as the M.P. M.M. L. It becomes maximum at the position of 71. The explosion-proof band 72 is an M.I. M.M. L. 71 is attached to the panel 54 so as to cover up 71. The explosion-proof band 72 is usually manufactured by connecting both ends of a strip-shaped metal plate in an annular shape.

  Sectional views in a plane perpendicular to the longitudinal direction of a general explosion-proof band 72 are shown in FIGS. The explosion-proof band 72 in FIG. 8A is the most common. The explosion-proof band 72 shown in FIGS. M.M. L. It is bent along the shape of the outer wall surface in the vicinity of 71. In the explosion-proof band 72 of FIGS. 8C and 8D, the front end 52 side end is folded back 180 ° in order to improve the strength.

  The explosion-proof band 72 reinforces the mechanical strength of the explosion-proof color picture tube 80 by tightening the panel 54 and applying pressure around it. That is, the explosion-proof band 72 is used to prevent the occurrence of implosion accompanied by the scattering of glass fragments when the envelope 81 evacuated so that the inner space becomes a high vacuum is damaged by an external force or the like. A characteristic regarding the difficulty of implosion of the explosion-proof color picture tube 80 is referred to as an explosion-proof characteristic. In order to stably tighten the panel 54 and obtain sufficient explosion-proof characteristics, the explosion-proof band 72 is made of M.P. M.M. L. It is considered effective to be mounted on 71. Support members 73 are attached to the four corners of the explosion-proof band 72. The explosion-proof color picture tube 80 is held and fixed to a TV cabinet (not shown) via a support tool 73.

  In recent years, demands for cost reduction of explosion-proof color picture tubes are severe, and in order to meet this demand, various members of the explosion-proof color picture tubes have been made thinner. The material cost is also reduced by reducing the thickness of the explosion-proof band 72.

9A is a rear view of the corner portion of the explosion-proof color picture tube 80 mounted on the TV cabinet 74 as seen from the neck 56 side, and FIG. 9B is a view taken along the line 9B-9B in FIG. 9A. 9C is a front view of the corner portion of the explosion-proof color picture tube 80 attached to the TV cabinet 74 as viewed from the front portion 52 side of the panel 54. FIG. The explosion-proof color picture tube 80 has a positioning support piece 75 formed on the TV cabinet 74, and the M.M. M.M. L. By being brought into contact with the portion closer to the front portion 52 than 71, it is positioned and fixed with respect to the TV cabinet 74. Here, when the explosion-proof band 72 is thinned, only thin min, the horizontal center axis X _C of the horizontal central axis X _T and TV cabinet 74 of the explosion-proof color picture tube 80 is misaligned. Therefore, the TV set manufacturer has to modify or newly manufacture the TV cabinet 74, and it becomes necessary to modify or newly manufacture a molding die for the TV cabinet 74, resulting in an increase in cost.

  Patent Document 1 discloses an explosion-proof band in which a band-shaped groove along the longitudinal direction is formed on one surface and a hook-shaped protrusion corresponding to the groove is formed on the other surface. Such an explosion-proof band generally allows a strip-shaped metal material to pass between a roller having a convex shape continuous on the outer peripheral surface and a roller having a concave shape continuous on the outer peripheral surface. Manufactured by plastic deformation.

  However, the explosion-proof band of Patent Document 1 is an M.I. M.M. L. Since it is mounted on the panel so that the groove of the explosion-proof band is located on the top, it has the maximum outer diameter of the panel. M.M. L. Is separated from the explosion-proof band. M.M. L. The fastening force of the explosion-proof band cannot be applied directly on the top. Therefore, since sufficient pressure cannot be applied to the outer periphery of the panel, sufficient explosion-proof characteristics cannot be obtained.

Further, as shown in FIG. 9B, the positioning support piece 75 of the TV cabinet 74 is formed of the M.P. M.M. L. Since the abutting portion 71 is in contact with the portion closer to the front portion 52 than 71, the convex portion formed in the explosion-proof band of Patent Document 1 may not abut against the positioning support piece 75. Therefore, it is not fully solved the problem that the horizontal center axis X _C of the horizontal central axis X _T and TV cabinet 74 of the explosion-proof color picture tube 80 is misaligned when the explosion-proof band was thinned.

Patent Document 2 discloses an explosion-proof band in which flare portions are formed at both ends in the width direction. When the explosion-proof color picture tube is attached to the TV cabinet, the flare part of the explosion-proof band comes into contact with the positioning support piece of the TV cabinet. Therefore, if the projection height of the flare part is set appropriately, the explosion-proof band is thinned. problem and horizontal center axis X _C of the horizontal central axis X _T and TV cabinet explosion-proof color picture tube is misaligned cases it may be possible to overcome.

  However, when the explosion-proof color picture tube is mounted on the TV cabinet, the flare portion of the explosion-proof band is caught on various portions of the TV cabinet, and the mounting workability is lowered.

Moreover, when forming a flare part in a both-ends, the flatness of the width direction of parts other than a flare part deteriorates, and it will become the shape where the cross-sectional shape along the width direction curved. For this reason, when an explosion-proof band is attached to an explosion-proof color picture tube, the flare portions on the both ends of the explosion-proof band and the vicinity thereof are separated from the panel, and sufficient pressure cannot be applied to the outer periphery of the panel. Not enough explosion-proof properties.
Japanese Patent Laid-Open No. 6-76763 (FIGS. 2 and 3) JP 2000-59805 A (FIGS. 4 and 8)

If thinning the explosion proof band as described above, and the horizontal central axis X _T and TV misalignment and horizontal center axis X _C of the cabinet of the explosion-proof color picture tube, requires modified or new fabrication TV cabinet is there.

  In the explosion-proof band of Patent Document 1, the panel M.D. M.M. L. Since the fastening force of the explosion-proof band cannot be directly applied to the top, sufficient explosion-proof characteristics cannot be obtained.

  Further, the explosion-proof band of Patent Document 2 may solve the above-described problem of misalignment between the explosion-proof color picture tube and the TV cabinet. Another problem arises, such as deterioration and inability to obtain sufficient explosion-proof properties.

The present invention has been made in view of the above problems, has sufficient explosion-proof characteristics, does not deteriorate the workability of mounting the explosion-proof color picture tube on the TV cabinet, and is explosion-proof even if the explosion-proof band is thinned. and to provide an explosion-proof color picture tube in which a horizontal center axis X _C of the horizontal central axis X _T and TV cabinet type color picture tube does not cause positional deviation.

  An explosion-proof color picture tube according to the present invention includes a front panel having a phosphor screen formed on the inner surface and a panel having a side wall, an envelope formed of a funnel-shaped funnel joined to the side wall, and the front unit. And an explosion-proof band attached to the panel so as to surround the side wall portion.

  The explosion-proof band extends in the longitudinal direction of the explosion-proof band in a region excluding both side ends in the width direction of the explosion-proof band on the front part side from the boundary between the front part and the side wall part. Has a convex part.

  According to the present invention, the explosion-proof band is a part having the maximum outer diameter of the panel. M.M. L. The top can be tightened directly. Thereby, the mechanical strength of the explosion-proof color picture tube evacuated to a high vacuum can be reinforced.

  In addition, since the convex part is formed in the area excluding both ends in the width direction of the explosion-proof band, when the explosion-proof color picture tube is mounted on the TV cabinet, the explosion-proof band is caught on various parts of the TV cabinet, and the mounting workability There is no problem of lowering.

  Furthermore, even if the explosion-proof band is made thinner, there is no positional deviation between the horizontal central axis of the explosion-proof color picture tube and the horizontal central axis of the TV cabinet. As a result, it is possible to achieve both cost reduction of the explosion-proof color picture tube and continuous use of the conventional TV cabinet.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the explosion-proof color picture tube 30 of the present embodiment includes at least an envelope 31 and an explosion-proof band 22.

  The envelope 31 includes a substantially rectangular glass panel 4 composed of a front part 2 and a side wall part 3 on which the phosphor screen 1 is formed, and a funnel-like glass funnel joined to the side wall part 3. It consists of five. The phosphor screen 1 includes a light absorption layer 12 formed in a plurality of stripes, and three-color phosphor layers 13R, 13G, and 13B that are sequentially embedded between the stripes of the light absorption layer 12. Opposite to the phosphor screen 1, a substantially rectangular shadow mask 10 is provided. The shadow mask 10 is formed with a plurality of slit-like electron beam passage holes (openings) 11, a curved main surface portion 15 facing the phosphor screen 1, and a main surface portion 15 that is bent to the main surface portion 15. The skirt portion 16 is provided around the surface portion 15. The skirt portion 16 of the shadow mask 10 is welded to a frame 18 having a substantially rectangular frame shape. The shadow mask structure 17 including the shadow mask 10 and the frame 18 is provided with a substantially wedge-shaped elastic support body 19 attached to the outer wall surfaces of the four corner portions of the frame 18 and the side wall portions 3 of the four corner portions of the panel 4. By being locked to the stud pin 20 planted on the inner wall surface, it is detachably supported inside the panel 4.

  An electron gun 7 that emits three electron beams 8R, 8G, and 8B is disposed in the neck 6 at the small diameter end of the funnel 5. The three electron beams R, 8G, and 8B emitted from the electron gun 7 are deflected by a deflecting device 9 mounted on the outer peripheral surface of the funnel 5 and are phosphor screens through the electron beam passage holes 11 of the shadow mask 10. By scanning 1 in the horizontal and vertical directions, a color image is displayed.

  At the boundary between the front part 2 and the side wall part 3 of the panel 4, there are lines (mold match line (MML)) 21 formed by the joint part of the mold used when the molding process is performed. The outer diameter of the panel 4 is maximized at the position of the MML 21. The explosion-proof band 22 covers the MML 21 so as to cover the MML 21. The explosion-proof band 22 is usually manufactured by connecting both ends of a strip-shaped metal plate in an annular shape.

  The explosion-proof band 22 reinforces the mechanical strength of the explosion-proof color picture tube 30 by tightening the panel 4 and applying pressure around it. That is, the explosion-proof band 22 is used to prevent the occurrence of implosion accompanied by the scattering of glass fragments when the envelope 31 evacuated so that the inner space becomes a high vacuum is damaged by an external force or the like.

  As shown in FIG. 3, the explosion-proof band 22 has a convex portion 23 extending continuously in the longitudinal direction. The protruding direction of the convex portion 23 is on the opposite side to the panel 4. The convex portion 23 is formed in a part of a region excluding both side ends of the explosion-proof band 22 in the width direction (direction substantially parallel to the tube axis Z). Such a convex portion 23 causes a strip-shaped metal material to be plastically deformed by passing between a roller having a convex shape continuous on the outer peripheral surface and a roller having a concave shape continuous on the outer peripheral surface. Can be manufactured. In this case, a concave portion extending in the longitudinal direction is formed at a position corresponding to the convex portion 23 on the surface opposite to the surface on which the convex portion 23 is formed.

  In the tube axis Z direction, the convex portion 23 is a boundary between the front portion 2 and the side wall portion 3. M.M. L. 21 is located closer to the front part 2 than 21. Therefore, the concave portion formed on the surface opposite to the convex portion 23 is M.M. M.M. L. 21 is located closer to the front part 2 than 21. Therefore, the explosion-proof band 22 is M.M. M.M. L. 21. M.M. L. The clamping force of the explosion-proof band 22 can be directly applied on 21. As a result, since sufficient pressure can be applied to the outer periphery of the panel 4, sufficient explosion-proof characteristics can be obtained.

  Moreover, since the convex part 23 is formed in the area | region except the both ends of the width direction of the explosion-proof band 22, the both-sides end of the explosion-proof band 22 in which the convex part 23 is not formed in the direction away from the panel 4 in flare form. Does not protrude. Therefore, when the explosion-proof color picture tube 30 is mounted on the TV cabinet, there is no problem that the explosion-proof band 22 is caught on various portions of the TV cabinet and the mounting workability is deteriorated. Moreover, even if the convex part 23 is formed using a pair of rolls as described above, the cross-sectional shape along the width direction of the explosion-proof band 22 is unlikely to be warped, and thus the clamping force of the explosion-proof band is reduced. There is nothing.

  Supports 24 are attached to the four corners of the explosion-proof band 22. The explosion-proof color picture tube 30 is held and fixed to a TV cabinet (not shown) via a support 24.

The protrusion 23 provided on the explosion-proof band 22 is M.M. M.M. L. Since it is located on the front part 2 side than 21, when mounting the explosion-proof color picture tube 30 on the TV cabinet, the positioning support piece formed on the TV cabinet comes into contact with the convex part 23 of the explosion-proof band 22. Thus, the explosion-proof color picture tube 30 can be positioned and fixed with respect to the TV cabinet. Even if the material of the explosion-proof band 22 is thinned, if the height of the convex portion 23 is appropriately set in accordance with the thinning amount, the explosion-proof color image receiver described in FIGS. 9A to 9C. a horizontal central axis X _C of the horizontal central axis X _T and TV cabinets tube can be prevented from being displaced. Here, the height of the convex portion 23 is the outer surface from the region where the convex portion 23 is not formed on the outer surface of the explosion-proof band 22 (the surface not in contact with the panel 4) to the top of the convex portion 23. The distance in the normal direction.

The location having the maximum outer diameter D _MAX of the explosion-proof color picture tube 30 including the convex portion 23 of the explosion-proof band 22 is M.M. M.M. L. It is preferable that it exists in the front part 2 side rather than 21. That is, it is preferable that the outer diameter of the explosion-proof color picture tube 30 is the maximum value D _MAX at the position of the convex portion 23. Thus, when the explosion-proof color picture tube 30 is mounted on the TV cabinet, the positioning support piece formed on the TV cabinet always comes into contact with the convex portion 23 of the explosion-proof band 22. Therefore, the positioning accuracy when the explosion-proof color picture tube 30 is mounted on the TV cabinet is improved.

  The results of an experiment using an explosion-proof color picture tube with a screen diagonal size of 68 cm are shown below.

  Two identical color picture tubes were prepared. A conventional explosion-proof color picture tube was manufactured by attaching a conventional explosion-proof band with a thickness of 1.5 mm with no projections on one color picture tube (hereinafter referred to as “conventional example”). . The other color picture tube was equipped with an explosion-proof band having a thickness of 1.0 mm provided with a convex portion in a part of the region excluding both side edges in the width direction to produce an explosion-proof color picture tube corresponding to the present invention. (Hereinafter, this is referred to as “Example”).

  The explosion-proof band of the explosion-proof color picture tube of the example was manufactured as follows. A strip-shaped long metal material having a predetermined width and a thickness of 1.0 mm wound on a roller was prepared. The metal material was unwound, passed through a forming device having a driving force, a convex portion continuous in the longitudinal direction was formed, and cut into a predetermined length. And the both ends were piled up and welded to make an annular shape. In addition, as a method of connecting in a ring shape, a known method can be used without being limited thereto, and for example, both ends of a metal material may be butted and a joint plate may be overlapped and welded. The forming apparatus includes a pair of upper and lower forming rollers, and a continuous convex shape is formed on the outer peripheral surface of one of the rollers, and a concave that continues to a position corresponding to the convex shape is formed on the outer peripheral surface of the other roller. A shape (groove) is formed. A gap corresponding to the thickness of the metal material is provided between the pair of forming rollers. By allowing the metal material to pass between the pair of forming rollers, it was possible to continuously form a convex portion on one surface and a concave portion on the other surface in the longitudinal direction of the metal material. The height of the convex part was 0.5 mm.

  In the embodiment, the above-described explosion-proof band is the same as the M.V. M.M. L. , And the convex part is M. of the panel. M.M. L. It was mounted by shrink fitting on the panel so that it was located closer to the front side. In the state after the explosion-proof band was attached, the outer diameter of the explosion-proof color picture tube was the maximum at the position of the convex portion.

  The explosion-proof band of the conventional explosion-proof color picture tube was manufactured in the same manner as in the example except that the thickness of the metal material was different and the convex part and the concave part were not formed using the forming device.

  In the conventional example, the conventional explosion-proof band is the same as that of the panel. M.M. L. In the same manner as in the example, it was shrink-fitted to the panel and attached.

  Two conventional TV cabinets designed to be fitted with the conventional explosion-proof color picture tube were prepared. One TV cabinet was fitted with the conventional explosion-proof color picture tube, and the other TV cabinet was fitted with the explosion-proof color picture tube of the example.

  4A is a rear view of a corner portion of a conventional explosion-proof color picture tube 80 mounted on a conventional TV cabinet 74 as viewed from the neck side, and FIG. 4B is a view of 4B- of FIG. 4A. 4B is an enlarged cross-sectional view of the portion 4C of FIG. 4B, and FIG. 4D is a conventional explosion-proof color image receiver mounted on a conventional TV cabinet 74. It is the front view which looked at the corner part of the pipe | tube 80 from the front part side of the panel.

A conventional explosion-proof color picture tube 80 in which an explosion-proof band 72 having a thickness of 1.5 mm is shrink-fitted is placed in a conventional TV cabinet 74, and is attached to the TV cabinet 74 via supports 73 provided at the four corners of the explosion-proof band 72. Holding fixed. At this time, the positioning support piece 75 provided on the inner wall of the TV cabinet 74 is connected to the M.M. M.M. L. Only the region closer to the front portion 52 than 71 contacts the outer surface of the explosion-proof band 72, whereby the explosion-proof color picture tube 80 is positioned with respect to the TV cabinet 74. As a result, the horizontal center axis X _C matches the horizontal center axis X _T and TV cabinet 74 of the explosion-proof color picture tube 80, and the central axis of the tube axis and TV cabinet 74 of the explosion-proof color picture tube 80 Matched. That is, the dimension of the positioning support piece 75 of the TV cabinet 74 is set so that the tube axis of the explosion-proof color picture tube 80 coincides with the central axis of the TV cabinet 74 when it comes into contact with the outer surface of the explosion-proof band 72. Has been.

  The conventional TV cabinet 74 was equipped with the explosion-proof color picture tube of the example. FIG. 5A is a rear view of the corner portion of the explosion-proof color picture tube 30 of the embodiment mounted on the conventional TV cabinet 74 as viewed from the neck side, and FIG. 5B is 5B- of FIG. 5A. 5B is a cross-sectional view taken along the line 5B, FIG. 5C is an enlarged cross-sectional view of the portion 5C of FIG. 5B, and FIG. 5D is an explosion-proof color image receiver mounted on a conventional TV cabinet 74. It is the front view which looked at the corner part of the pipe | tube 30 from the front part side of the panel.

The explosion-proof color picture tube 30 of the embodiment in which the explosion-proof band 22 having a thickness of 1.0 mm and the height of the convex portion 23 is 0.5 mm is shrink-fitted is placed in a conventional TV cabinet 74 and provided at the four corners of the explosion-proof band 72. It was held and fixed to the TV cabinet 74 via the support 24. At this time, the positioning support piece 75 provided on the inner wall of the TV cabinet 74 has the M.M. M.M. L. 21, the outer surface of the convex portion 23 of the explosion-proof band 22 located on the front portion 2 side than 21 is brought into contact, whereby the color image receiver 30 is positioned with respect to the TV cabinet 74. The explosion-proof band 22 of the embodiment is made of a material 0.5 mm thinner than the explosion-proof band 72 of the conventional example, but the height of the convex portion 23 is set to be the same as this thickness difference (0.5 mm). and a horizontal central axis X _C matches the horizontal center axis X _T and TV cabinet 74 of the type color picture tube 30, the central axis of the tube axis and TV cabinet 74 of the explosion-proof color picture tube 30 are matched.

Thus, in the embodiment, the M.I. M.M. L. The convex portion 23 is provided in the region of the explosion-proof band 22 closer to the front portion 2 than 21, and the height of the convex portion 23 is the same as the thickness reduction of the explosion-proof band 22 with respect to the conventional explosion-proof band 72. Therefore, even if the explosion-proof band 22 is thinner than the conventional explosion-proof band 72, the explosion-proof color picture tube 30 of the embodiment has the horizontal center axis _XT and the horizontal center of the TV cabinet 74. without the axis X _C is misalignment could be attached to the TV cabinet 74. That is, in the embodiment, the design change of the positioning support piece 75 of the conventional TV cabinet 74, the modification of the molding die associated therewith, the new TV cabinet different from the TV cabinet 74, and the molding corresponding thereto. There was no need to make a metal mold.

  Further, the convex portion 23 formed on one surface of the explosion-proof band 22 has a M.M. M.M. L. 21 is located on the side of the front part 2 with respect to 21, the recess formed on the other surface is also M.21. M.M. L. It was located on the front part 2 side rather than 21. As a result, the M.I. M.M. L. The explosion-proof band 22 is brought into contact with the upper surface 21, and the tightening force of the explosion-proof band 22 is set to M.21. M.M. L. 21 could be directly affected. Therefore, sufficient pressure can be applied to the outer periphery of the panel 4, and sufficient explosion-proof characteristics can be obtained.

  Furthermore, since the convex portion 23 is formed in a region excluding both ends of the explosion-proof band 22 in the width direction, the edge of the explosion-proof band 22 in the width direction when the explosion-proof color picture tube 30 is attached to the TV cabinet 74. Is not caught in various parts of the TV cabinet 74, and the mounting workability is not different from the conventional example.

  According to the present invention, even if the explosion-proof band is thin, the conventional explosion-proof color picture tube is aligned with the center of the conventional TV cabinet without modifying or newly manufacturing the conventional TV cabinet. It can be installed in a TV cabinet, which is effective for cost reduction. Further, since the projections are formed on the explosion-proof band, the explosion-proof characteristics of the explosion-proof color picture tube are not deteriorated. Therefore, the industrial value of the present invention is extremely high, and its application field is not particularly limited and can be used in a wide range.

FIG. 1 is a cross-sectional view showing a schematic configuration of an explosion-proof color picture tube according to an embodiment of the present invention. FIG. 2 is a perspective view showing an arrangement of electron beam passage holes of a shadow mask in an explosion-proof color picture tube according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing an explosion-proof band and its periphery in an explosion-proof color picture tube according to an embodiment of the present invention. 4A is a rear view showing a corner portion of a conventional explosion-proof color picture tube mounted on a conventional TV cabinet, and FIG. 4B is an arrow along line 4B-4B in FIG. 4A. 4C is an enlarged cross-sectional view of a portion 4C of FIG. 4B, and FIG. 4D shows a corner portion of a conventional explosion-proof color picture tube mounted on a conventional TV cabinet. FIG. FIG. 5A is a rear view showing a corner portion of an explosion-proof color picture tube of an embodiment mounted on a conventional TV cabinet, and FIG. 5B is an arrow along line 5B-5B in FIG. 5A. FIG. 5C is an enlarged cross-sectional view of a portion 5C of FIG. 5B, and FIG. 5D shows a corner portion of an explosion-proof color picture tube of an embodiment mounted on a conventional TV cabinet. FIG. FIG. 6 is a cross-sectional view showing a schematic configuration of a conventional explosion-proof color picture tube. FIG. 7 is a perspective view showing an arrangement of electron beam passage holes of a shadow mask in a conventional explosion-proof color picture tube. 8A to 8D are cross-sectional views of a general explosion-proof band attached to a conventional explosion-proof color picture tube. 9A is a rear view showing a corner portion of a conventional explosion-proof color picture tube mounted on a TV cabinet, and FIG. 9B is a cross-sectional view taken along line 9B-9B in FIG. 9A. FIG. 9C is a front view showing a corner portion of a conventional explosion-proof color picture tube mounted on a TV cabinet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Phosphor screen 2 Front part 3 Side wall part 4 Panel 5 Funnel 6 Neck 7 Electron gun 8R, 8G, 8B 3 Electron beam 9 Deflector 10 Shadow mask 11 Electron beam passage hole 12 Light absorption layer 13R, 13G, 13B Three-color fluorescence Body layer 15 Main surface portion 16 Skirt portion 17 Shadow mask structure 18 Frame 19 Elastic support 20 Stud pin 21 Mold match line (MML)
DESCRIPTION OF SYMBOLS 22 Explosion-proof band 23 Convex part 24 Support tool 30 Explosion-proof type color picture tube 31 Envelope 51 Phosphor screen 52 Front part 53 Side wall part 54 Panel 55 Funnel 56 Neck 57 Electron gun 58R, 58G, 58B 3 Electron beam 59 Deflector 60 Shadow mask 61 Electron beam passage hole 62 Light absorption layer 63R, 63G, 63B Three-color phosphor layer 65 Main surface portion 66 Skirt portion 67 Shadow mask structure 68 Frame 69 Elastic support 70 Stud pin 71 Mold match line (M.M.L. .)
72 Explosion-proof band 73 Support tool 74 TV cabinet 75 Positioning support piece 80 Explosion-proof color picture tube 81 Envelope

Claims (2)

A panel having a front part and a side wall part with a phosphor screen formed on the inner surface, an envelope made of a funnel-shaped funnel joined to the side wall part, and the panel so as to surround the front part and the side wall part An explosion-proof color picture tube having an explosion-proof band attached to
The explosion-proof band extends in the longitudinal direction of the explosion-proof band in a region excluding both side ends in the width direction of the explosion-proof band on the front part side from the boundary between the front part and the side wall part. An explosion-proof color picture tube having a convex portion. 2. The portion having the maximum outer diameter of the explosion-proof color picture tube including the convex portion of the explosion-proof band exists on the front portion side of the boundary between the front portion and the side wall portion in the tube axis direction. Explosion-proof color picture tube as described in 1.

Images