JPS5857857B2 - color picture tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an improved color picture tube structure, and in particular a method for attaching a shadow mask to a funnel in a color picture tube using a panel without sidewalls. It is.

Recently, with the aim of reducing the cost of color picture tubes, panels having a structure without side walls have begun to be used.

This is an attempt to raise the production index and reduce costs by reducing the weight of the panels.

Additionally, the lack of a skirt on the panel makes it easier to perform various treatments on the phosphor surface; for example, the conventional method of injecting phosphor slurry into the inner surface of the panel and rotating the panel at high speed to evenly coat the phosphor surface. Instead, there is a method in which the phosphor slurry is poured in a curtain shape and applied by passing the panel through the curtain.
No. 465.

However, there is a condition that the shadow mask as a color selection electrode must be attached to the panel in a state where it can be freely removed and with good position reproducibility with respect to the panel even if it is repeatedly removed. In this case, instead of the conventional pins embedded in the side wall of the panel, mask supporting studs must be embedded or glued into the inner surface of the panel, and various methods have been proposed for this structure. has been done.

However, providing a support stand inside the panel has various disadvantages as described below.

The first drawback is that the usable fluorescent surface area is reduced.

The studs must be located on the inside of the funnel, and if you look through the fluorescent surface of a television set, it is unsightly to see the studs. Since the phosphor is coated only on the inside at a distance, the phosphor surface area becomes significantly narrower than the outside of the panel.

Conversely, this means that the external size of a panel having the same fluorescent surface size becomes larger, and in the conventional example, the external size is between 20 and 40 mm larger.

If the external size of the panel is large, the external size of the television set will also be large and the design will be very unsightly.

A second drawback is that it is highly unsuitable for the curtain-like application of phosphor slurry as disclosed in U.S. Pat. No. 3,876,465.

In order for the slurry flowing in a curtain shape to be evenly applied to the inner surface of the panel, the curtain must be a uniform laminar flow, but near the stand the slurry curtain is disturbed by the stand and becomes turbulent flow, which causes the membrane near the studs to flow. The structure becomes uneven and looks very unsightly.

Although this phenomenon is less likely to occur in an area a certain distance from the stand, using only a portion with a uniform film structure reduces the usable area of the fluorescent surface, which is very inconvenient, similar to the first drawback.

The third drawback is that if you use a panel without side walls and use a compatible mask as described below, it will be very easy to create a luminous surface by printing, but in this case you will not be able to stand it even if you turn it. Its existence is very inconvenient.

The fourth drawback is that the pins embedded in the inner surface of the panel have no protected part because there is no side wall of the panel, and when placed on a flat plate, the studs directly hit the flat plate.

With this type of structure, there are many opportunities to apply force to the studs during work, which can result in cranking of the panel or deformation of the stand, resulting in a high defect rate in the manufacturing process and an increase in manufacturing costs. have shortcomings.

However, recent technological advances have shown that this problem can be resolved.

Conventionally, the shadow mask and panel have had a relationship similar to the negative and positive images in a photograph, and once the combination of shadow mask and panel has been put into the exposure process, it must not be changed until the color picture tube is completed. However, in most cases, satisfactory color purity for a color picture tube could not be obtained.

However, recently it has become possible to obtain sufficient color purity even if the shadow masks are replaced during the process, that is, it has become possible to provide compatibility between shadow masks.

In such a case, it is not necessarily necessary to attach the shadow mask to the panel, and it is sufficient to attach the shadow mask to a predetermined position on the funnel immediately before welding the panel and the funnel with frit glass or the like.

Therefore, an object of the present invention is to provide a method for attaching the shadow mask to the funnel instead of to the panel when compatible shadow masks are used. By carrying out the present invention, the shadow mask can be attached to the inner surface of the panel. This eliminates the need for mounting supports, which increases the surface area of the inner surface of the panel that can be used as a luminescent surface.

It is suitable for the phosphor coating method shown in Patent No. 3,876,465, and is also very advantageous for producing a phosphor surface by a printing method.

Additionally, since there are no supports, there are no panel cranks that would otherwise occur due to unintentional force being applied to the supports, and the panels can be stored and moved in a dense manner, which is necessary for transportation, warehousing, etc. Costs can be significantly reduced.

Next, the content of the present invention will be explained using the drawings.

FIG. 1 is a diagram showing an embodiment of a color picture tube of the present invention.

The panel 1 is made of glass of substantially uniform thickness with a convex top surface and a concave bottom surface, and the concave inner surface 2 has only a phosphor and a metal back layer.

If necessary, a light-absorbing material layer may be interposed between the dot-like or stripe-like phosphors for the purpose of improving contrast.

Furthermore, as will be described later, a graphite film may be provided in the vicinity of where the contact spring fixed to the shadow mask comes into contact with the inner surface of the panel, and the graphite film may be further overlapped with a metal puncture layer to achieve electrical conduction.

The shadow mask 3 has a portion 4 shaped to have almost the same shape as the inner surface 2 of the panel and has a hole through which the electron beam passes, a first side wall portion 5 without holes, and a first side wall portion 5 that is formed from the first side wall portion. Flange portion 6 bent outward at approximately right angles
, a second side wall portion 7 bent toward the electron gun from the outer end of the flange portion 6, and mounting elements 8 provided at at least three of the four corners.

The side wall portion 5, the crank portion 6, and the second side wall portion 7 are provided with reinforcing ribs 9.

Further, a contact spring 41 is fixed to the shadow mask by welding or the like to establish electrical conduction with the metal puncture layer on the inner surface of the panel.

The upper open end of the funnel 10 is a sealing surface 11 formed in a chevron shape along the edge of the inner surface 2 of the panel 1. Near the sealing surface 11, at least three of the four corners of the inner surface of the funnel are covered with shadow masks. A support 12 for engaging with the mounting element 8 of No. 3 is embedded.

Instead of being embedded, the support 12 may be fixed with a frit or the like.

A neck pipe 13 is welded to the lower open end of the funnel 10.

First, the parts prepared as shown in Figure 1 are shadow mask 3.
After engaging the mounting element 8 with the support 12 of the funnel 10 and placing the panel 1 on the sealing surface 11 and accurately fixing the mutual positional relationship between the panel and the funnel with a jig, the two are fixed using low melting point glass. Glue.

Thereafter, the electron gun may be sealed, evacuated, and aged according to the usual manufacturing method for color picture tubes.

FIG. 2 shows mounting elements 8 located at the corners of the shadow mask 3.
It is a perspective view showing further details.

The mounting element 8 is attached to the spring support 21 and the spring 2
2.

The spring support 21 includes a portion 21a fixed to the first side wall portion 5 of the shadow mask 3 by welding or the like, a portion 21c to which the spring 22 is fixed by welding or the like, and an arm portion 21b connecting the two.

One end of the spring 22 is fixed to the spring support 21, and the other end is provided with a hole 23 for engaging with the support 12.

The spring support body 21 extends from the corner of the shadow mask 3 to the first side wall portions on both sides sandwiching the corner.

Since it is difficult to provide the flange portion 6 and the second side wall portion 7 to a part of the pre-processed corner of the shadow mask 3,
The spring support 21 is made of a thin metal band of 0.5 to 2 mm to provide a reinforcing effect.

FIG. 3 shows the first side wall 5, the flange 6, and the second
FIG. 7 is a diagram showing that the side wall portion 7 of the device has a sufficient shielding effect against an overscanned electron beam.

FIG. 4 is a diagram showing a conduction mechanism of a color picture tube according to the present invention.

The high voltage supplied from the outer surface of the funnel of the anode button 42 embedded in the funnel 10 is applied to the anode button 4
The button is pressed on the inner surface of the funnel 2 and transmitted to the inner conductive film 43 coated on the inner surface of the funnel 10, and the inner conductive film 43
It is transmitted to the support 12 through.

The light is then transmitted to the entire shadow mask 3 via the spring 22 engaged with the support 12 .

A phosphor layer 44 and a metal puncture layer 45 are present on the inner surface 2 of the panel 1, and after the attachment element 8 of the shadow mask 3 is engaged with the support 12 of the funnel 10, the panel 1 is sealed to the funnel 3. When placed at a predetermined position on the surface 11, the tip of the contact spring 41 fixed to the shadow mask 3 by welding or the like comes into contact with the metal back layer 45, and as a result, the height supplied from the anode button 42 The voltage reaches the metal pack layer 45.

In order to make the contact between the contact spring 41 and the metal puncture layer 45 more reliable and stable, a graphite film 46 is provided on the inner surface of the panel, the tips of the contact springs 41 are brought into contact, and the graphite film 46 is extended to the metal puncture layer 45. Conductivity can be achieved by at least overlapping them and bringing them into contact.

The shadow mask having such a configuration as described above can be fixed to the funnel, unlike the conventional method, and can be attached and detached freely.

Therefore, there is no need for a support for supporting the shadow mask on the inner surface of the panel, and the shape of the panel becomes very simple.

Although various applications are possible without departing from the purpose of the present invention, a few of them will be described below.

Figures 5a and 5b show another embodiment of the invention.

FIG. 5a is a perspective view of the mounting element and the support according to this embodiment, and FIG. 5 shows a cross-sectional view of the mounting element and the support when they are pressed into a fitted state.

The mounting element 8 is attached to the spring support 21 and the spring 3
1.

The spring 31 has a portion 31a welded to the spring support 21, and a protrusion 3 whose end is folded back into a U shape to generate spring force and determine the fitting position with the support 32.
1b, bent portion 31c, and housing portion 31 for attachment and detachment
Consists of d.

The support 32 includes a leg portion 32a buried in the inner surface of the funnel and a surface 32c bent at a certain angle from the surface including the leg portion and including a fitting hole 32b for the spring 31.

FIG. 5 shows a state in which the spring 31 and the support 32 are fitted together, and as is clear from the figure, the inner surface of the fitting hole 32b of the support 32 is preferably slightly rounded.

When the button is in such a fitted state, the elastic energy due to the spring force of the spring 31 is minimized, making it possible to obtain stable support.

Furthermore, this example is characterized by the following points.

That is, if the shadow mask is compatible, it is sufficient to attach the shadow mask immediately before the panel and funnel are semi-permanently fixed with frit glass or the like.

Therefore, in the case of this example as well, just before the funnel and panel are combined and put into the furnace, the shadow mask mounting element 8 is constructed from the upper open end side of the funnel, while aligning the shadow mask and the central axis of the funnel almost in the same direction. If the bent portion of the spring 31 is inserted into the hole 32b of the support 32 and pushed in, the spring 31 will click and stop when it reaches the state shown in Figure 4.

Therefore, the work of inserting the shadow mask becomes very easy, and deformation and damage to the shadow mask due to handling errors can be greatly reduced.

Further, when the shadow mask is to be removed from the funnel support, it can be easily removed by bending the hook portion 31b in the direction of the arrow in FIG.

6a and 6b show still another embodiment of the present invention, which is a modification of the shadow mask holding mechanism shown in FIG. 5,
The same parts as in FIG. 5 are given the same reference numerals.

A feature of FIG. 6 is that the bent portion 31c of the spring 31 is provided with a second protrusion 31e.

Furthermore, in this case, the inner surface of the fitting hole 32b of the support member 32 does not need to be particularly rounded, and may be slightly chamfered as necessary.

In the case of a structure like this example, the first protrusion 31b and the second protrusion 31e provided on the spring 31 are connected to the support 3.
Since the surface 32c including the second fitting hole 32b is sandwiched between the surfaces 32c by spring force, very stable and firm holding can be obtained.

Furthermore, ease of insertion, click stop mechanism, method of removal, etc. are exactly the same as in the case of FIG.

Figures 7a, b, and c are other application examples of the present invention, and Figure 7a
The spring 42 is a modification of the spring shown in FIG.
FIG. 1 is a modification of the support shown in FIG. 5, and FIG. 7C is a modification of the support shown in FIG.

=Generally, the position of the shadow mask is determined by three mounting elements and the supports that engage with them, but if you want to firmly hold the shadow mask, prepare four or more mounting elements and four or more supports each. You may do so.

However, in this case, if the mounted state is not perfect, safety points will occur in various states of the shadow mask, and the position reproducibility of the shadow mask will be lost.

This application example solves this drawback and is particularly effective for the shadow mask structure of the present invention in which the peripheral portion of the shadow mask can be moved in the tube axis direction with a relatively weak force.

The feature of FIG. 7a is that the shape of the hole 23 is elongated in the lateral direction.

Three of the holes in the attachment element f of the shadow mask are left as before, and one hole is made in this manner, thereby obtaining the following effects.

That is, if the hole shape is as shown in FIG. 7a, the position of the shadow mask in the tube axis direction is completely fixed.

That is, the distance between the shadow mask and the inner surface of the panel can be maintained stably.

The position of the shadow mask in the plane perpendicular to the tube axis is the remaining 3
determined by the number of mounting elements.

In Figure 7, c, the position of the shadow mask is completely fixed in the direction of the tube axis by the spring and support, but it can move freely within a certain range in the plane perpendicular to the tube axis, as in a. obtain.

As in the case of FIG. 7a, the position of the shadow mask is determined by the remaining three sets of mounting elements and supports.

In the present invention, the mounting elements of the Nyadou mask and the supports on the inner surface of the funnel are all located at the corners of the screen, but as is conventionally done, the mounting elements and supports are provided on the short axis and the long axis. Various modifications are possible, such as providing it at a position slightly apart from the axis or at a position slightly apart from the axis.

In addition, although the above description describes the use of compatible masks, it is clear that a structure in which a mask and a panel are paired as in the past is also within the technical scope of the present application, and in such a structure, for example, exposure This can be achieved, for example, by inserting a light source into the neck tube and exposing it with a shadow mask attached to the funnel, and there are various effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the components of a color picture tube according to the present invention, FIG. 2 is a diagram showing details of a mounting element used in the present invention, and FIG. 3 is an electron beam with an overscanned shadow mask used in the present invention. FIG. 4 is a diagram showing an application example of the present invention, FIG. 5 a y b is a diagram showing another application example of the present invention, FIGS. 6 a, b, and 7 a ,b,c
FIG. 3 is a diagram showing another application example of the present invention. 1...Panel, 3...Shadow mask, 10...
Funnel, 12.32... Support, 22.31...
- Spring, 43... Internal conductive film, 44... Phosphor layer, 45... Metal dock layer, 46... Graphite layer.

Claims (1)

[Scope of Claims] 1. A color picture tube constructed by a combination of the following parts. (a) It has a roughly rectangular screen, and has a structure in which a flat glass is bent to have a convex surface on the outside and a concave surface on the inside, and there is no side wall, and the concave surface is stimulated by an electron beam. A panel comprising at least a phosphor layer and a metal puncture layer that emit light when (c) a funnel having a lower opening end connected to a neck part in which an electron gun is disposed, and a supporter for engaging and holding a shadow mask near the upper opening end; (c) as a whole; Similar to the panel, it has a rectangular shape,
The panel is shaped into a substantially spherical shape along the inner surface of the panel, has an electron transmission hole in the spherical surface, and is provided with a shadow mask mounting element provided to engage with a support provided on the cut funnel. shadow mask. 2. According to claim 1, the shadow mask attachment element and the funnel support are engaged when the shadow mask is inserted from the upper open end of the funnel with their axes substantially aligned in the same direction. The structure has a click stop at a predetermined position, and at that position, the shadow mask is completely fixed, and when the shadow mask is removed from the funnel, it can be easily removed by bending a part of the mounting element within the elastic limit. A color picture tube with a structure that allows for 3. Based on paragraph 1 or 2 of the scope of claims,
Mounting elements are provided at the four corners of the shadow mask, and supports are also provided at the four corners of the corresponding funnel.The engagement structure at one of the four corners is fixed in the direction along the tube axis, and A color picture tube characterized by having a structure that allows movement in a plane perpendicular to the axis. 4. In claim 1 or 2, the edge of the shadow mask which has an opening and is shaped into a semi-spherical shape has an edge bent approximately parallel to the tube axis toward the electron gun. A flange part is bent outward perpendicularly to the tube axis, and a second side wall part is bent along a funnel toward the electron gun side. A color picture tube characterized by a structure that shields unnecessary overscanned electrons. 5% The color picture tube according to claim 1, characterized in that the shadow mask and the metal puncture layer on the inner surface of the panel are electrically connected through a conductive film partially superimposed on the metal back layer. 6. A color picture tube according to claim 5, characterized in that a contact spring fixed to the shadow mask is brought into contact with the conductive film to establish electrical continuity between the shadow mask and the metal puncture layer. 7. A color picture tube according to claim 5 or 6, in which the conductive film is made of graphite.