JPH0279344A - Television receiver - Google Patents

Abstract

PURPOSE:To prevent an image-receiving tube from implosion while keeping the latest design of the tube alive by forming a window frame unit out of an opaque portion and a transparent portion, providing the transparent portion inside the opaque portion and specifying the relation among the sizes of the openings of window frames defining their respective portions and the size of a fluorescent screen. CONSTITUTION:A window frame unit fringing the peripheral region of a fluorescent screen which forms the whole surface panel of a color image-receiving tube(CRT) 1 is formed out of a transparent portion 21A and an opaque portion 21B while the transparent window frame portion 21A is provided inside the opaque window frame portion 21B. The relation among the size WEA of the opening of the transparent window frame portion 21A, the size WEB of the opening of the opaque window frame portion 21B and the size WS of the screen is then established to satisfy an expression of WEB>WEA WS. This makes it possible to obtain a television receiver with its highly reliable CRT 1, by providing such structure as hardly subjected to any injury being involved in a breakdown of glass while keeping the television receiver in its original novel design, and less possibility for the CRT 1 to implode.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television receiver, and particularly to a display device used in commonly used television receivers and computer terminals.

[Conventional technology]

For example, FIG. 3 shows a television receiver for explaining the concept of the present invention, which has recently come into use. Third
The picture receiver shown in the figure is broadly divided into a color picture tube (hereinafter referred to as CRT) 1 which is a display part, a circuit (not shown) for driving the same, and a case 20.

Figures 4 (a) and (b) are - CRT l used for boat fishing.
(Al is a side view of the CRT including a partially cutaway view, and (b) is a front view thereof.

In FIG. 4(a), a common shadow mask type color picture tube consists of a glass vacuum container,
A fluorescent screen 3 is attached to the inner surface of the front section 2A of the panel. Further, the panel front section 2A is connected to a funnel-shaped funnel section 4 via the panel side section 2B, and the glass vacuum container has a neck section 5 containing these and an electron gun (not shown). It is configured.

The fluorescent screen 3 is printed in correspondence with the countless small holes formed in the frit sealing surface 6, which is a shadow mask facing the fluorescent screen 3. 7 is a portion where the panel 2 and the funnel 4 are sealed with frit glass, which is glass solder.

Since the CRTl having the above-mentioned structure is a glass vacuum container, for example, scratches on the glass portion may develop and lead to the phenomenon of "implosion". This phenomenon occurs because the inside is a vacuum and atmospheric pressure is applied to the CRTl, but when the glass breaks due to cracks or the like, glass fragments are first sucked into the inside and then ejected. Since these flying glass fragments are extremely dangerous, CRTs are usually subjected to explosion-proof treatment. For example, paper tape 7 is wrapped around the panel side surface 2B in Fig. 4, and high-tensile steel is wrapped over the paper tape 7. It is tightened with a metal band 10, and due to this tightening force, even if the glass is broken, the glass fragments will be removed from the front surface 2 of the panel.
It is designed to significantly reduce the possibility of it jumping out to the A side. Reference numeral 9 denotes ears for attaching the CRTI to the receiver, which are held between the band 10 and the panel 2B or welded to the band 10.

FIG. 4(b) is a front view of the CRTI, and for future explanation, the long axis, short axis, and diagonal axis are X, Y, and P, respectively.
axis, and the screen center as the 0 axis. This zero axis coincides with the tube axis including the central axis of the neck portion 5. A fluorescent screen 3 is shown, shown in dash-dotted lines, which generally matches the side walls of the panel 2.

Figure 5 explains the recent trends in the design of television receivers, and shows the size of a window frame 21 called an "escutcheon" that frames the periphery of the fluorescent screen 3 in the receiver case, and the screen 3. shows the size of In previous general television receiver designs, the dimension WE of the hollow portion of the window frame 21 was made to approximately match the dimension WS of the screen.

However, in recent designs, the trend of WE>WS has become preferred. Further, the window frame 21 is usually made of a black resin molded product in order to make the screen 3 look more attractive and to prevent the unnecessary internal contents of the receiver from being seen.

Figures 6 (a) and (bl) are intended to explain recent trends in detail, and show cross-sectional views of the peripheral area of the screen at the X-axis end of the CRTl. This is an example of a window frame according to the invention, and the hollow dimension WE of the window frame 21 and the screen dimension WS show the relationship WE=WS, and the window frame 21 is provided on the viewer 22 side of the panel 2A. One problem is that the fluorescent screen 3 is located on the inner surface of the panel, and the window frame 2
1 is that it is an external surface. Normally, the size of panel glass varies depending on the size, but it is about 10 to 15 cranes. Figure 6 1
b) is an example of the window frame 21 in the case of the recent trend. In this figure, if the thickness of the panel is H and the viewer's line of sight 22 is inclined by θ degrees with respect to the tube axis, then the case shown in Figure 6 In the design of ~
) itan θ screen can be viewed without missing a comparison screen compared to the conventional one.

Although the explanation has been given here only in the X-axis direction, which is the long axis of the CRTI, the same tendency applies to the Y-axis and P-axis.

[Problem to be solved by the invention]

By the way, since a CRT is a glass vacuum container, stress is generated in the glass when it is evacuated.

Figure 7 is a diagram showing how stress is generated due to vacuum in a CRT.
Only the quadrants are shown. Therefore, CR corresponding to the Y-axis direction
SA is the line along the tube wall of T.

Similarly, LA and DA correspond to the X-axis and P-axis. The shaded areas in the figure are areas where tensile stress is generated in the glass, and these are areas that require special attention.

In addition, (a), (bl, (C1 is the above SA
, LA.

The stress along DA is shown, with tensile stress being shown outward from the CRT surface, and compressive stress being shown inward. What is more noteworthy here is that
The areas with high tensile stress are from the vicinity of the effective screen end on the front side of the panel to the panel side part 2B and the frit seal part 7.
and part of funnel 4, but these parts are the 6th part.
In the conventional design of Figure (a), high stress areas were not exposed at the end customer's location.

That is, the funnel 4 is inside the set from the panel side surface 2B, and the screen edge is also located as shown in FIG. 6(a).
As shown, the areas of high stress were hidden structures. However, in recent designs such as those shown in Figures 3, 5, and 6 (BL), areas with higher tensile stress are exposed than in the past, and there is a high possibility that unexpected damage will occur in the market. This structure increases the possibility of CRT implosion.

The present invention has been made to solve the above-mentioned problems, and aims to provide a receiver having a more reliable CRT while taking advantage of the features of recent designs.

[Means to solve the problem]

In the picture receiver according to the present invention, the window frame that frames the periphery of the fluorescent screen that constitutes the entire panel of the picture tube is composed of a transparent part and an opaque part, and the transparent window frame is placed inside the opaque window frame. The opening size W of the window frame of the transparent part is provided.
The relationship between EA, the opening dimension WEB of the window frame of the opaque portion, and the screen dimension WS is such that WEB>WEA≈WS.

[Effect]

In this invention, since the above-described structure is adopted, the design of the receiver satisfies WS<WE, but since the high-stress area is substantially covered by the transparent part of the window frame, there is an undesirable problem. Concerns about serious damage and destruction can be reduced to the same level as in the past, which has been experienced for a long time.

〔Example〕

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

FIG. 1 is a diagram showing a receiver according to an embodiment of the present invention.

In this embodiment, the conventional window frame 21 has two parts 21A and 21
The window frame 21B is an opaque window frame similar to the conventional one, and the window frame 21A is a transparent window frame made of a resin plate such as a transparent enbi plate with a thickness of 3 mm or less.

FIG. 2 is a diagram corresponding to conventional FIG. 6 (al and (bl) showing the size relationship of the window frames in FIG.
The relationship between the opening dimension WF of A, the opening dimension WEB of A, the opaque window frame 21B, and the dimension ws of the screen 3 is as follows: WEB>WEA≈WS.

As shown in FIG. 1, the transparent window frame 21A covers the entire circumference near the edge of the screen. Further, the opaque window frame 21B is the same as that shown in FIG. 3, which is a recent conventional example. Here, the transparent window frame 21A may be glued and fixed to the window frame 21B, or it may be fixed to the surface of the CRT in advance and attached to the receiver. Moreover, in order to make the transparent window frame 21A macroscopically similar to that shown in FIG. 3, it is desirable to have a wall thickness thinner than 3 mm so that extreme lines at the boundaries are not noticeable.

In this embodiment, the design of the receiver satisfies WS<WE, and the high-stress area is covered with a transparent window frame, so it may be unexpectedly scratched and CR
The possibility of T implosion is reduced, making CRT highly reliable.
It is possible to obtain a receiver having the following.

In another embodiment of the present invention, in order to avoid the complexity of assembling the receiver, a
For example, a coating film containing silicate is applied and heat treated, and a film equivalent to 21A is applied to the front of the screen panel.
It can also be made as a hard coat on external surfaces.

In yet another embodiment of the present invention, the film may not necessarily be baked by heat treatment, and in this case, the susceptibility to scratches can be significantly reduced.

〔Effect of the invention〕

As described above, according to the present invention, the window frame that frames the periphery of the fluorescent screen that constitutes the entire panel of the picture tube is composed of a transparent part and an opaque part, and the inside of the window frame is made transparent, Opening dimension WEA of the window frame of the transparent part, opening dimension WEB of the window frame of the opaque part, and dimension Ws of the screen.
Since the relationship between WEB > WEA ≒ WS allows the design of the receiver to remain new, it is possible to create a structure that is resistant to scratches that can lead to glass breakage, improving the reliability of the picture tube and, ultimately, the receiver. This has the effect of increasing the reliability of

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a receiver according to an embodiment of the present invention, and FIG.
The figure is a diagram for explaining the size of the screen window frame of a television receiver according to an embodiment of the present invention, Figure 3 is a diagram showing a conventional television receiver, and Figures 4 (al) and (b) are configurations of the picture tube. Figure 5 is a diagram illustrating a recently popular television receiver, Figure 6 is a diagram explaining the
al, (b) is a diagram showing the size of the screen window frame of a television receiver in recent design trends, Figures 7 and 8 (a)
) ~ (C1 is a diagram explaining the state of stress generation due to vacuum in the picture tube. In the figure, 1 is the picture tube, 2 is the panel, 2A is the front part of the panel,
2B is the panel side part, 3 is the fluorescent screen, 4 is the funnel part, 5 is the neck part, 6 is the frit sealing surface (shadow mask), 7 is the frit sealing part, 8 is the Gion tape, 9 is the ear, 10 is the Metal band, 20 is the case, 21 is the window frame, 2
1A is a window frame made of a transparent member, 21B is a window frame made of an opaque member, 22 is the viewer's eye, WS, WEA, and WEB are the fluorescent screen size and the opening size of window frame A, respectively. and the opening size of window frame B. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In a picture receiver that has a fluorescent screen on the inner surface of the front panel of the picture tube, and a window frame that frames the periphery of the fluorescent screen on the outer surface of the panel, the window frame has an opaque part and a transparent part. A transparent part is provided inside, and the relationship between the opening dimension WEA of the window frame of the transparent part, the opening dimension WEB of the window frame of the opaque part, and the dimension WS of the fluorescent screen is WEB>WEA A receiver characterized by having ≒WS.