JPS5923433A - Shadow mask body structure - Google Patents

Abstract

PURPOSE:To prevent the deterioration of a screen caused by the mounting shift of an electron shield and obtain stable picture quality by providing a moving part such as a memory metal that can freely be bent through a bent section such as a thin section and a hole section on the end face of an opening section that is opposed to the tube axle of a frame. CONSTITUTION:A frame 24 that holds a shadow mask 23 permits a side wall section 241 to be fixed to the skirt section 231 of a mask 23 and a bottom section 242 to be formed into almost an L-shaped cross section so as to be opposed to a tube axle. A moving part 28 that can freely be bent through a thin section 27 as a bent section is provided at least on a part of the end face of an opening section that is opposed to the tube axle of this bottom section 242. That is, before a phosphor screen is formed, the moving section 28 is bent as shown by a broken line so that the exposure condition of the phosphor screen is identical to the dimensions of a frame opening section. After the phosphor screen is formed, the moving part is returned to the direction of an arrowhead 29 and is sent in a desired position as an electron shield.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a shadow mask structure, and more particularly to an improvement in a frame.

[Technical background of the invention and its problems]

The first panel part of a general shadow mask type color picture tube
The main parts of the shadow mask structure will be explained with reference to FIG.

That is, a deep dish-shaped panel (11) made of tempered glass with a spherical front surface has a predetermined arrangement of dot-shaped or band-shaped fluorescent screens (2) formed on the spherical inner bottom surface of the panel (11). A shadow mask (3) having outer dimensions smaller than the opening dimensions of this panel (1) is housed inside.

Further, a frame (4) for holding this shadow mask (3) is provided on the funnel side (not shown) of this shadow mask (3), and this frame (4) has a side wall portion (4).
, ) are fixed to the skirt part (3 m) of the shadow mask (3), and the bottom part (4,) faces the tube axis and has an L-shaped cross section. ,
The side wall portion (4,) is provided with a plurality of support pieces (5) made of a spring material with one end fixed to form a shadow mask structure, and a lock near the other end of the support piece (5) is provided. The hole is secured by a panel pin (forced) installed in the inner wall of the panel (1), which supports the shadow mask structure so that the distance between the shadow mask (3) and the phosphor screen (2) is a predetermined value. There is.

Furthermore, an annular electron shield (8) made of a thin metal plate is fixed to the bottom surface (4,) of the frame (4). However, as is well known, the electron shield (8) is usually fixed after the phosphor screen (2) is formed.
) is fixed to the bottom part (4,) of the frame (4).
The distance between the tube axis side cut section OI of the bottom surface part (4,) and the tube axis side cut section Qll of the electron shield (8) is not uniform, and as a result, the fluorescence of the electron beam from the electron gun (not shown) The electron beam that should be hitting the effective part of the surface (2) may be cut by the electron shield (8), or conversely it will hit a part other than the effective part, resulting in poor quality of the characteristics of the color picture tube. In addition, since this electron shield (8) is generally made of a thin aluminum plate, it is easily deformed during the process from molding to fixing it to the frame, which also causes poor characteristic quality. There was an interval that caused this.

[Purpose of the invention]

The present invention has been made in view of the various drawbacks of the conventional art described above, and includes a movable part that can be freely bent via a bending part on at least a part of the end face of the opening of the frame facing the tube axis. The object is to provide a shadow mask structure adapted for use in electron shielding.

[Summary of the invention]

That is, the present invention includes a frame holding a shadow mask;
In a shadow mask structure comprising a support piece having one end fixed to the frame and attached to a panel pin through a locking hole near the other end, at least one of the end faces of the opening facing the tube axis of the frame It is characterized in that a movable part that can be freely bent via a bending part is provided in a part, and the bending part is a thin part, a hole part, and the movable part is made of memory metal.

[Embodiments of the invention]

Next, a first embodiment of the present invention will be explained with reference to FIGS. 3 to 5.

That is, a frame (24) for holding this shadow mask (c) is provided on the funnel side (not shown) of the shadow mask (231), and this frame (21 is attached to the side wall part (2).
41) is the shadow mask (231's skirt part (231)
) and the bottom part (24,
) is formed to face the tube axis and has a roughly L-shaped cross section, and the side wall (241) is provided with a plurality of support pieces (C) made of spring material with one end fixed. One Q
The locking hole (c) near the other end of the shadow mask Q3 is locked to a panel pin planted on the inner wall of the panel.
As in the conventional example, the shadow mask structure is supported so that the distance between the phosphor screen and the phosphor screen becomes a predetermined value. It is characterized in that a movable part (g) that can be freely bent is provided at least in part through a thin wall part (2) serving as a bending part. That is, before the phosphor screen is formed, the movable part (281) is bent as shown by the broken line in FIG.
It is also possible to set it at a desired position as an electron shield in both directions.

In this way, the movable part C can be freely bent via the bending part.
By providing the mark, the movable part (c) used as an electron shield can be molded from the same part as the frame 3, and the electron shield (8) can be molded from the same part as the frame 3.
) is fixed after forming the phosphor screen, the gap (1z) between the opening cut surface (Ill) of the electron shield and the press cut surface α of the opening end surface (9) of the frame (1z) will never occur. The cut surface of the movable part track that serves as an electron shield with respect to the central axis of the panel (1), that is, the tube axis (
28+) becomes fixed, and the electron beam from the electron gun (not shown) that is supposed to hit the effective part of the phosphor screen is cut by the movable part (c), or conversely it hits a part other than the effective part. There is no need to do this, and the quality of the characteristics as a color picture tube can be made extremely good.

Furthermore, since the movable part is made of the same material as the frame C24j, it does not deform like in conventional electron shields. Furthermore, the movable part (C) remains in frame C until after the phosphor screen is formed.
Since the movable part (28) is located inside a, it is possible to prevent deformation of the movable part (28) during transport during the formation of the phosphor screen, and since the movable part (28) is a shared part with the electron shield, the material Further benefits can be obtained in terms of losses.

In the above embodiment, the thin wall portion was formed by a groove with a V-shaped cross section from both sides, but it is of course possible to form a groove with a U-shaped cross section from one side. It goes without saying that various reinforcing means may be provided on the side wall portion (24s) and/or the bottom surface portion (24t') for reinforcement, since it is structurally desirable to do so.

6 and 7 show modified examples of this embodiment, and FIG. 6 shows a side wall portion (24
1), the bottom part (24t) is further bent in an inverted shape to form a side wall part (24+a) and a bottom part (24za), and a tapered side wall part (24+b) and a bottom part (24zb) are provided. A movable part (C) is provided through the bottom part (24zb) and the thin part Qη. Furthermore, in FIG. 7, a flange (29) is further provided at the end of the side wall portion (241) on the side of the shadow mask (C) for the same purpose as in FIG.
In this case, the skirt part (231
) will be held on the inner surface of the side wall part (241) of the frame (two forces).

The other parts are almost the same as those in FIG. 6, so the explanation will be omitted.

Next, the main part of the second embodiment of the present invention will be explained with reference to FIG.

That is, in this embodiment, the frame (goods) is formed into a substantially U-shaped shape, and includes a side wall (241), a bottom (2" it), and a side wall (2").
24rB) - bottom part (24ta), and this bottom part (24ta)
4ga) and a hole (g) as a bending part between the movable part and the
It is characterized by having the following.

In the above embodiment, the hole serving as the bent portion was semicircular, but
This may be a trapezoid, a triangle, or any shape in which the low rotation portion (281) is easy to bend.

Next, a third embodiment of the present invention will be explained with reference to FIG.

In the figure, the same reference numerals as in the embodiment of the cylinder 2 indicate the same parts and will not be particularly described.

That is, in this embodiment, frame c! 4) bottom part (242
A memory metal 311 as a movable part is connected to a), and the memory metal r31) is effective because it changes not only its size and position but also its shape through processing.

In addition to the embodiments described above, it is conceivable that various reinforcement measures are taken for the frame C21.

〔Effect of the invention〕

As described above, according to the present invention, the conventional electron shield installation does not cause deterioration of the color picture tube screen due to positional deviation, maintains stable image quality, and uses a frame that can be shared with the electron shield. Further effects can be obtained in terms of material loss, and by making the frame thinner and providing a reinforcing section, the landing at the initial start-up can be improved, and this has great industrial value.

[Brief explanation of the drawing]

1 and 2 are diagrams showing a conventional shadow mask structure. FIG. 1 is an exploded perspective view including the panel part, FIG. 2 is a sectional view of the main part, and FIGS. FIG. 4 is a diagram showing a first embodiment of the shadow mask structure of the invention, FIG. 3 is a perspective view, and FIG. 4 is a sectional view of essential parts showing the relationship with a frame with a shadow mask. 5 is an enlarged sectional view of the main part of FIG. 4, FIGS. 6 and 7 are sectional views of the main part of different modifications of the second embodiment, and FIG. 8 is a sectional view of the main part of the shadow mask structure of the present invention. FIG. 9 is a perspective view of the main parts of the second embodiment, and FIG.
FIG. 2 is a perspective view of essential parts of the embodiment. 3.23...Shadow mask 4,24...Frame 5.25--Support piece 8...Electron shield 27...Thin wall part 28...Movable part 29...
・Flange 30...hole 31...Memory Metal Agent Patent Attorney Inoue -Male

Claims (3)

[Claims] (1) A shadow mask structure consisting of a frame that holds a shadow mask, and a support piece that has one end fixed to the frame and is attached to a panel bin through a locking hole near the other end, A shadow mask structure, characterized in that a movable part that can be freely bent via a bending part is provided on at least a part of the end face of the opening of the frame facing the tube axis. (2) The shadow mask structure according to claim 1, wherein the bent portion is a thin portion. (3) The shadow mask structure according to claim 1, wherein the bent portion is a hole. (4) The shadow mask structure according to claim 1, wherein the movable part is a memory metal part.