JPS643164Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color picture tube, and more particularly to the arrangement of a funnel getter in a color picture tube provided with an internal magnetic shield.

Color picture tubes, especially three-electron beam type color picture tubes having a color selection electrode such as a shadow mask, are susceptible to the effects of earth's magnetism, so an internal magnetic shield is usually installed along the inner wall of the funnel from the color selection electrode.

On the other hand, since there are many parts inside the color picture tube, such as the shadow mask, mask frame, and their supports, the getter for the funnel is placed close to the inner wall of the funnel, and the wide space inside the funnel is kept under high vacuum. things are being done.

Next, one example of such a color picture tube will be explained with reference to FIG. That is, a color picture tube consists of a panel 2, on the inner surface of which is adhered a phosphor screen 1 having regularly arranged phosphor layers that emit light in red, green, and blue colors when electron beams strike the panel 2; side wall part 3
The funnel 4 connected to the
A net 5 connected to the net 5, and a cathode 6 _K , a first grid 6 ₁ , a second grid 6 2 , a third grid _{6 3 ,} a fourth grid 6 ₄ and a convergence electrode 6 ₅ installed in the net 5 . The electron gun 6 and the three electron beams from this electron gun 6 are selected and the phosphor screen 1
A color selection electrode 7 such as a shadow mask that is projected onto each phosphor layer forming the phosphor layer, and a mask frame that holds the color selection electrode 7 and is supported via a support by a panel pin installed on the inner wall of the side wall 3. 8, an internal magnetic shield 9 fixed to the mask frame 8 and provided along the inner wall of the funnel 4 in the direction of the neck 5, and an internal conductive coating 10 formed on the inner wall from the neck 5 to the funnel 4. and,
It is fixed to the side wall of the convergence electrode ₆₅ of the electron gun 6 and is electrically connected to the internal conductive coating 10,
Three valve spacers 11 for positioning the electron gun 6 and a getter 12 filled with getter material
and a getter support 1 fixed to the side wall of the convergence electrode 6 of the electron gun 6 and supporting the getter 12 on the internal conductive film 10 on the inner wall of the funnel 4.
3, and an anode terminal 14 that is implanted in the funnel 4 and applies an external anode voltage to the internal conductive coating 10.
and an external conductive coating 15 applied to the outer wall of the funnel 4.

In the color picture tube having the structure described above, the getter support 13 is connected to the convergence electrode 6 of the electron gun 6.
₅ and the fourth grid 6 ₄ connected thereto, and since the getter 12 is in contact with the internal conductive coating 10 , the getter support 13 connects the support 12 ₁ of the getter 12 and the valve spacer 11 . The inner conductive coating 10 between them will be short-circuited. In such a color picture tube, there is a gap between the fourth grid ₆₄ to which the anode voltage is applied and the opposing third grid ₆₃ to which a low voltage is applied during the manufacturing process of the color picture tube. When discharge occurs during the voltage aging process or during operation in a color receiver,
This impairs the effectiveness of the internal conductive coating 10, which has a high resistance in order to reduce the discharge current caused by this discharge. Moreover, if the length of the getter support 13 is too long, it may come into contact with the internal magnetic shield 9 or get between the internal magnetic shield 9 and the funnel, reducing the getter effect. 12 is dispersed into the tube by high-frequency heating from outside the tube, but at this time, the high-frequency heating simultaneously heats the internal magnetic shield 9, causing insufficient or uneven heating of the getter 12, and causing the getter material to scatter. There are drawbacks such as the fact that the particles are not dispersed uniformly and sufficiently.

The present invention was developed in view of the above-mentioned drawbacks of the conventional method, and it does not reduce the effect of the discharge current of the internal conductive coating, the getter scatters in a favorable direction, and the getter can be easily and firmly attached. The aim is to provide a color picture tube with a wide range of colors.

That is, in the present invention, an opening or a notch is formed in the internal magnetic shield, a getter support is installed in this opening or notch, and a getter filled with a getter substance is inserted into the getter support. It is characterized by being attached closer to the inner wall of the funnel than the magnetic shield.

Next, an embodiment of the color picture tube of the present invention will be described with reference to FIGS. 2 to 6.

That is, a color picture tube consists of a panel 22 on which is adhered a phosphor screen 21 on which a phosphor layer is regularly arranged to emit light in red, green, and blue colors when electron beams strike it, and a side wall of this panel 22. A funnel 24 connected to the portion 23, a neck 25 connected to the funnel 24, a cathode _26K installed in the neck 25, a first grid ₂₆₁ , a second grid ₂₆₂ , and a third grid _263. , a fourth grid ₂₆₄ and a convergence electrode ₂₆₅ .
A color selection electrode 27 such as a shadow mask that selects three electron beams from the electron gun 26 and strikes each phosphor layer forming the phosphor screen 21, and a side wall portion 23 that holds the color selection electrode 27. A mask frame 28 is supported by a support body on panel pins installed in the inner wall, and a net 25 is fixed to the mask frame 28 and extends along the inner wall of the funnel 24.
A first shielding plate 29 1 and a first shielding plate 29 ₁ are provided in the direction of the phosphor screen, are partially overlapped on the short side of the phosphor screen, and are configured such that a V-shaped notch 29 ₃ is formed by the open end edge. Internal magnetic shield 2 consisting of 2 shielding plates 29 ₂
9, an internal conductive coating 30 formed on the inner wall from the neck 25 to the funnel 24;
Three valve spacers 31 are fixed to the side wall of the convergence electrode ₆₅ of the electron gun 26, are electrically connected to the internal conductive coating 30, and are used to position the electron gun 26; and the V-shaped internal magnetic shield 29. Getsuta support 4 installed between notch 29 ₃
3, the getter support 43 is attached to the center thereof in a position closer to the inner wall of the funnel 24 than the internal magnetic shield 29, and the V-shaped notch 29
an anode terminal 34 that is implanted in the funnel 24 and applies an external anode voltage to the internal conductive coating 30; and an external magnet coated on the outer wall of the funnel 24. It has a conductive film 35. Note that the getter 42 is filled with, for example, an oxidation-resistant getter material.

For example, as shown in FIG. 3, the getter support 43 has a central portion 43a for fixing the getter 42, two sides 43b with both ends of this central side bent in the same direction at approximately right angles, and a predetermined portion of these two sides 43b. It consists of a protrusion 43c provided at the top and a tongue 43d bent outward from the protrusion 43c at a predetermined distance, and is made by bending a ribbon-shaped metal plate into a substantially U-shape in the longitudinal direction. As shown in _FIG .
Slits 29 _1a , 29 are provided oppositely near the notch formed by the shielding plate 29 ₂ .
A tongue piece 43d is inserted into _2a , and is mechanically fixed by this tongue piece 43d and the protrusion 43c.

FIG. 5 shows the first shielding plate 29 ₁ and the second shielding plate 2.
9 ₂ is spaced apart from the opening 29 ₄ .

FIG. 6 shows the funnel 24, the internal conductive coating 30,
This shows the positional relationship between the getter support 43 and the internal magnetic shield 29, and the getter 42 is shown to be located closer to the inner wall of the funnel 24 than the internal magnetic shield 29.

When arranged in this way, by making the length of the getter support 43 shown in FIG. 3 appropriate, the getter 42 can be effectively heated with high frequency without heating the internal magnetic shield 29 from outside the tube too much. Furthermore, by separating the getter 42 from the internal conductive coating 30, it is possible to prevent thermal failure of the internal conductive coating 30 and the funnel 24 due to high frequency heating.

Further, the getter support 43 in this embodiment described above does not come into contact with the internal conductive coating 30,
Therefore, the fourth grid 26 ₄ to which the anode voltage is applied
Even if discharge occurs between the 3rd grid 263 _{and the third} grid 263, which is installed opposite to this and to which low voltage is applied, during the high voltage aging process during the manufacturing process of color picture tubes, or when the color picture tube is installed and operated in a color picture tube machine. Moreover, the effect of the internal conductive coating 30, which has a high resistance in order to reduce the discharge current due to this discharge, is not deteriorated. Furthermore, when the electron gun 26 is enclosed in the neck 25, it is not necessary to insert the getter 42 to the inner wall of the funnel via a long getter support as in the conventional case, which damages the internal conductive coating 30 and generates dust inside the tube. There's nothing to do. Furthermore, as shown in FIGS. 3 and 4, by mechanically fixing both ends of the getter support 43, there is no splash during welding, and the getter support 43 can be firmly attached.
Furthermore, by making the shape of the getter support 43 appropriate, it is easy to change the scattering direction of the getter material, and as a result, the getter material does not fly to undesired areas, and the brightness of the phosphor screen, black spots, and electronic It is possible to obtain a good color picture tube in which the landing of the beam onto the phosphor layer and the convergence characteristics are hardly affected.

In the above embodiment, the getter support is provided in the notch or opening of the internal magnetic shield, but in a color picture tube or the like in which the internal magnetic shield serves as both the mask frame and the like, the getter support is provided in the mask frame. Of course, it may be provided.

As mentioned above, the color picture tube of the present invention can maintain its characteristics well by changing the position and attachment mechanism of the funnel getter, and its industrial value is extremely large.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view of a conventional color picture tube, FIGS. 2 to 6 are views showing an embodiment of the color picture tube of the present invention, and FIG. 3 is a side view showing the getter and getter support used in FIG. 2; FIG. 4 is an explanatory view of the main parts showing the getter and getter support of FIG. 3 attached to the internal magnetic shield; FIG. 5 is an explanatory view of the main part showing a state in which the getter is attached to the opening of the internal magnetic shield, and FIG. 6 is an explanatory view of the main part showing the positional relationship of the internal magnetic shield, the getter, and the funnel. 9,29... Internal magnetic shield, 10,30...
Internal conductive coating, 11, 31...valve spacer,
12,42...Getsuta, 13,43...Getsuta support.

Claims (1)

[Claims for Utility Model Registration] (1) A panel having a phosphor screen formed of a phosphor layer that emits red, green, and blue colors when struck by an electron beam on its inner surface, and a panel connected to this panel. A funnel, a net connected to the funnel, an electron gun mounted in the net, a shadow mask for selecting the impingement of the electron beam emitted from the electron gun onto the phosphor layer, and an internal magnetic shield disposed in the neck direction from the peripheral edge almost along the inner wall of the funnel, and having an opening or a notch formed in a part; 1. A color picture tube comprising: a built-in getter support; and a getter supported by the getter support and disposed at a position closer to the inner wall of the funnel than the internal magnetic shield. (2) The getter support is formed by bending a ribbon-shaped metal plate into a substantially U-shape in the longitudinal direction, with both ends facing near the opening or notch of the internal magnetic shield. The color picture tube according to claim 1, which is mechanically supported through a slit.