JPH0416346Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a color picture tube, and more particularly to a color picture tube in which an internal magnetic shield is attached to a frame holding color selection electrodes.

[Technical background of the invention and its problems]

In order to prevent mislanding of the electron beam onto the phosphor screen due to the influence of external magnetism, some shadow mask type color picture tubes are provided with an internal magnetic shield to surround the path of the electron beam.

4 to 6 show an example of a conventional color picture tube provided with an internal magnetic shield.

This color picture tube 1 has a panel 3 1 on the inner surface of which is adhered a phosphor screen 4 in which two-color phosphor layers that emit light in each color of red, green, and blue are regularly arranged by the impingement of electron _beams . , a net 3 3 welded to the panel 3 ₁ via a funnel 3 ₂ , an electron gun 2 installed in _{the net 3 3 ,} and three-color fluorescence of three electron beams from the electron gun 2 A color selection electrode 5 such as a shadow mask that selects the impact on the body layer, and a panel pin 9 that holds this color selection electrode 5 and is installed on the inner wall of the panel 3 ₁ through a band-like frame support 8 . It includes a supported rectangular frame 6 and an internal magnetic shield 7 supported by the frame 6.

Of these, the assembly structure of the frame support 8, the frame 6, and the internal magnetic shield ₇ will be explained. ₂
is one end, and the other end is provided with a fitting hole ₈₁ for fitting and supporting the panel pin 9 described above. This frame support 8 is attached to each side of the frame 6, and the positions of the welded fixing part ₈₂ and the fitting hole ₈₁ of this frame support 8 with respect to the frame 6 usually coincide with the tube axis of the color picture tube. Horizontal axis X-X and vertical axis Y-Y passing through the central axis of frame 6
However, it is located a certain distance away. In other words, the position of arrow B is the welding holding part 8 ₂ , and the position of arrow A is the fitting hole part 8 ₁ .

The internal magnetic shield 7 is supported on the frame 6 by horizontal axis X-X, vertical axis Y-Y, and diagonal axis P-
Supports provided on the flange 7 ₁ of the internal magnetic shield 7 on the mounting portions 6 ₃ and 6 ₄ provided on P, Q-Q or in the middle of each of these axes, that is, at arbitrary locations on the flange portion 6 ₂ Align hole 7 ₂ and insert support pin 1
It is fixed by inserting 0.

However, the mounting support of the frame support 8 and the internal magnetic shield 7 to the frame 6 described above are different in position with respect to each axis such as the horizontal axis XX and the vertical axis Y-Y. As a result, the frame support 8 and the internal magnetic shield 7 have different attachment support stress points to the frame 6, and the stress point of the frame support 8 to the frame 6 is at arrow B point, that is, at the welded fixing portion 8.
₂ , and the stress points of the internal magnetic shield 7 on the frame 6 are the mounting holes 6 ₃ and 6 ₄ , so the frame 6
A large stress strain is applied to the color selection electrode 5 that selects the electron beam, and the generally used color selection electrode 5 with a plate thickness of 0.1 to 0.2 mm is likely to be deformed due to this stress strain, resulting in poor characteristics. A stable color picture tube 1 cannot be provided. Also, during operation, due to vibrations such as sounds, the surface contact portion between the flange portion 6 ₂ of the frame 6 and the flange portion 7 ₁ of the internal magnetic shield 7 rubs against each other, causing dirt and surface coating to peel off, and the color picture tube 1 There is a problem of deteriorating the characteristics of.

[Purpose of invention]

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a color picture tube that minimizes the deformation of color selection electrodes due to stress strain and has stable characteristics that do not generate dust or peeling. It is an object.

[Summary of the idea]

That is, in the present invention, each side of the rectangular frame holding the color selection electrode is provided with a welded fixing part to the frame at one end and a fitting hole part at the other end to fit into a panel pin implanted in the inner wall of the panel. In a color picture tube in which a strip-shaped frame support is attached via a welded fixing part, and an internal magnetic shield is supported on each side of the frame via a fixing part, The fixing part consists of point contact welding between the frame and the internal magnetic shield, and a gap is formed between the frame and the internal magnetic shield except for the fixing part of the point contact weld, and this fixing part is formed by point contact welding between the frame and the internal magnetic shield. This is a color picture tube characterized in that it is located between the welded fixing parts on each side of the frame and the horizontal and vertical axes passing through the center of the frame, and the fixing parts are laser welded.

[Example of idea]

Next, one embodiment of the color picture tube of the present invention will be described with reference to FIGS. 1 to 3.

That is, the color picture tube 21 has a panel 23 on the inner surface of which is adhered a phosphor screen 24 in which three-color phosphor layers that emit light in each color of red, green, and blue are regularly arranged by the impingement of electron beams. ₁ , a net 23 3 welded via a funnel 23 ₂ joined to this panel 23 ₁ , an electron gun 22 installed in this net _{23 3 ,} and 3 of the 3 electron beams from this electron gun 22. A color selection electrode 25 such as a shadow mask that selects the impact on the color phosphor layer, a panel pin 29 that holds this color selection electrode 25 and is embedded in the inner wall of the panel 23 ₁ , and a band-shaped frame support 28
a rectangular frame 26 supported via;
Internal magnetic shield 2 supported by this frame 26
It is equipped with 7.

Of these, the frame support 28 and the frame 26
To explain the assembly structure of the internal magnetic shield 27, the frame support 28 has a welded fixing part ₂₈₂ attached to the side wall part ₂₆₁ of the frame 26 having an L-shaped cross section by welding at one end, and a panel pin at the other end. Fitting hole portion 28 ₁ for fitting and supporting 29
is provided. This frame support body 28 is attached to each side of the frame 26, and the position of the welding fixing part ₂₈₂ and the fitting hole part ₂₈₁ of this frame support body 28 with respect to the frame 26 is normally the center of the frame 26 that regulates the frame 26. horizontal axis X-X passing through
and located a certain distance apart on either side of the vertical axis Y-Y. That is, the position of arrow B is the welding fixing part 28 ₂ , and the position of arrow A is the fitting hole part 28 ₁ .

Further, the internal magnetic shield 27 is supported by the frame 26 by the flange portion 27 of the internal magnetic shield 27.
A protrusion 2 formed on ₁ to protrude in the direction of the frame 26
The top part 27 ₃ of 7 ₂ is attached to the flange part 26 of the frame 26.
₂ by laser welding to form a fixed part.
This fixed part can be used for horizontal axis X-X or vertical axis Y-Y.
and the welding fixing part ₂₈₂ .

When the protrusion 27 ₂ is provided in this way, a gap 30 is provided between the flanges 26 ₂ and 27 ₁ , and there is no peeling of dirt or surface coating due to the rubbing of the flanges 26 ₂ and 27 ₁ . Become. Further, the stress strain applied to the frame 26 can be minimized for the following reason, and a color picture tube with stable characteristics can be obtained.

In other words, in order to prevent excessive stress strain from being applied to the frame, it is logical to consider the positional relationship between the support stress points of the frame support and internal magnetic shield with respect to the frame, so that the welded and fixed parts of the frame support and the fitting holes It is best that the fixed parts of the magnetic shield and the internal magnetic shield are all located on the horizontal and vertical axes of the frame, but in the case of a strip frame support, both the welded fixed parts and the fitting holes are located on the horizontal axis or the vertical axis. It is difficult to position it on the vertical axis.

Therefore, for such a strip-shaped frame support, as shown in the embodiment, the welding fixing portion 28 ₂ and the fitting hole portion 28 ₁ of the strip-shaped frame support 28 are aligned with respect to the horizontal axis and the vertical axis. It is best to place them on both sides. In this case, frame 2
In order to minimize the stress strain applied to the magnetic shield 6, the fixed portion of the internal magnetic shield may be aligned with the welded fixed portion ₂₈₂ . However, if the welded fixing portion 28 ₂ of the frame support 28 is displaced from the horizontal and vertical axes, the thermal expansion of the frame 26 due to heating will cause the welded fixing portion 28
₂ as the starting point, l ₁ > l ₂ and l ₃ > l ₄ . However, l ₁ ,
l ₂ , l ₃ , and l ₄ are the lengths from the welding fixing portion 28 ₂ to the end of the frame 26. In this case the internal magnetic shield 27
In order to eliminate the influence of this thermal expansion of the frame 26 on the frame 26, the fixing portions may be placed on the horizontal and vertical axes of the frame 26, which is a different position from that for minimizing the stress strain. Therefore, in order to reduce both the effects of stress strain and thermal expansion on the frame 26, the fixed part of the internal magnetic shield 27 should be located between the welded fixed part ₂₈₂ and the horizontal and vertical axes of the frame 26. As a result, the stress and strain applied to the frame 26 can be minimized to provide a color picture tube with stable characteristics.

In the embodiments described above, the internal magnetic shield was described, but the present invention can also be applied as is when supporting other parts on the frame.

[Effects of the invention] As described above, according to the invention, it is not only possible to minimize the stress and strain caused by attaching the frame support and internal magnetic shield to the frame, but also to prevent the generation of dust and peeling. It is possible to provide a color picture tube with stable characteristics.

[Brief explanation of the drawing]

1 to 3 are diagrams showing an embodiment of the color picture tube of the present invention, in which FIG. 1 is a longitudinal sectional view, and FIG.
The figure is a cross-sectional view of Figure 1 taken along line C-C, Figure 3 is an enlarged cross-sectional view of the main part, and Figures 4 to 6.
The figure shows an example of a color picture tube in Izu.
4 is a longitudinal cross-sectional view, FIG. 5 is a cross-sectional view of FIG. 4 taken along line D-D, and FIG. 6 is an enlarged cross-sectional view of a main part. 6, 26...mask frame, 6 ₂ , 26 ₂ , 7
₁ , 27 ₁ ... Flange portion, 7, 27 ... Internal magnetic shield, 8, 28 ... Frame support, 8 ₂ , 2
8 ₂ ... Welding fixing part, 10 ... Support pin, 27 ₂ ...
...Protrusion, 30...Gap.

Claims (1)

[Claims for Utility Model Registration] (1) On each side of a rectangular frame holding a color selection electrode, one end is welded and fixed to the frame, and the other end is fitted into a panel pin embedded in the inner wall of the panel. A color picture tube comprising: a band plate-shaped frame support provided with a fitting hole for attaching the frame through the welding fixing section; and an internal magnetic shield supported on each side of the frame via the fixing section. In the above, the fixed portions on each side of the frame are formed by point contact welding between the frame and the internal magnetic shield, and there is no gap between the frame and the internal magnetic shield except for the fixed portion of the point contact weld. A color picture tube characterized in that the fixing portion is located between the welding fixing portions on each side of the frame and a horizontal axis and a vertical axis passing through the center of the frame. (2) Utility model registration claim 1 characterized in that the fixing part is point contact welded by laser welding
Color picture tube as described in section.