JPS5927065B2 - color cathode ray tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color cathode ray tube suitable for use as a color picture tube of a color television receiver, for example.

A conventional color cathode ray tube (shadow mask type color picture tube) 10 is constructed as shown in FIG. 1, in which reference numeral 11 is a panel made of glass.

This panel 11 is an image display section, and support pins 16 made of metal or ceramic material for suspending a shadow mask are implanted on the inner surface of the side wall 11a.

Furthermore, a fluorescent surface 12 based on three primary colors (red, blue, and green) is formed on the inner surface of the panel 11, and a highly pure aluminum metal film 13 is further formed on this fluorescent surface 12 by vapor deposition technology. , no adhesion is formed.

A shadow mask 15, which is made of a curved iron plate with usually 100,000 to 400,000 small holes and has a color separation function, is spaced approximately equally spaced from the fluorescent surface 12 and has a strong generally L-shaped cross section. The support frame 14 is fitted into the support frame 14 and fixed by welding.

A support pin 16 is installed on the side wall 11a of the panel 11.
The metal support band 11 is welded and fixed to the side wall of the frame 14 so that a predetermined distance from the fluorescent surface 12 is maintained by the elastic metal support band 11 interposed between the frame 14 and the frame 14, and the metal support band 11 is integrally suspended. There is.

In addition, in order to block the reflected beam incident on the space between the side wall 11a of the panel 11 and the side wall of the frame 14 by deflecting the electron beam, a shielding plate 1 made of aluminum foil is installed.
8 is attached to the frame 14.

The panel 11 having such a shadow mask 15 etc. has a funnel-shaped funnel 21 with a low melting point glass 19 in the large diameter part.
The funnel 21 is integrally connected to the neck tube 24.

The funnel 21 is a metal terminal 2 that supplies high voltage electricity.
0 and has means for supplying high voltage from the outside to the inside.

Further, a graphite conductive coating 22 is baked onto the inner wall surface of the funnel 21 up to a portion of the neck tube 24 .

An electron gun assembly 25 is enclosed within the neck tube 24, and has a structural principle in which the high voltage is supplied to the shadow mask 15 and the electron gun assembly 25 by connection means of spring elements 27 and 28.

Then, the color cathode ray tube 10 is completed by keeping the inside of the container in a vacuum and following the flow of the cathode ray tube manufacturing equipment process.

In terms of electrical operation, the effective image surface is no different from conventional finished products, but explosion-proof safety is required.
The outer periphery of the side wall of the panel 11 is wrapped and fixed with a predetermined tightening force by an explosion-proof metal ring element 26 formed of a metal ring and a steel band.

In such a conventional color cathode ray tube 10, during operation, the electron beam emitted from the electron gun 25 is deflected by a deflection device (not shown) attached to the outer periphery of the connection between the funnel 21 and the neck tube 24, so that the electron beam is displayed on an effective screen. Department, as well as
It is deflected to an extra area, passes through the small hole of the shadow mask 15, and hits the three colors (red, blue, green material) of the predetermined fluorescent surface 12 to emit light. A phenomenon occurs in the shadow mask 15 in which the iron plate is heated by the electron beam energy.

As a result, thermal expansion occurs due to temperature, and the shadow mask 1
Discrepancies occur due to deformation and elongation of the spherical value of the molded 5 itself and the pitch between small holes.

Therefore, there are three
There is a drawback that the colored fluorescent surfaces 12 cannot emit light accurately, and the areas of other fluorescent surfaces 12 also emit light, resulting in an image with mixed colors without the faithful color effect of the video screen.

To deal with this phenomenon, even if the color image is adjusted by adjustment on the television receiver side, the difference in the thickness of the shadow mask 15 and the thickness of the frame 14, that is, due to the difference in capacitance and the relationship between time, the transfer of heat conduction is affected. The situation remains unstable.

Similar to the above case due to thermal expansion, there was a drawback that the image was not stable and the image showed a color shift phenomenon.

In addition, each electrode portion convex portion shadow mask 15 and frame 14
, installation of the frame 14 and the elastic metal support band 17 , installation of the frame 14 and the aluminum foil shielding plate 1
8, the frame 14 and the spring element 2T, etc., are fixed by welding using a welding device, so there is no risk of molten lumps scattering and damaging the effective dimension V of the video screen of the fluorescent surface 12 inside the tube, or peeling off the graphite conductive coating 22. In other words, the peeled part is a defect that deteriorates the electrical characteristics of the cathode ray tube due to adhesion of foreign matter (
There was a drawback that it resulted in poor withstanding voltage.

The object of the present invention is to provide a color cathode ray tube that eliminates the above-mentioned conventional drawbacks.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

This invention has major features in its panel shape, shadow mask structure, and its suspension means, but first a general description of the color cathode ray tube (shadow mask type color picture tube) according to the invention will be given, and then the above features will be described in detail.

That is, the overall structure of a shadow mask type color picture tube 50, which is an example of the present invention, is shown in FIG.
1 is a panel made of glass.

This panel 51 consists of a spherical part for displaying an image and a side wall 51a connected to the spherical part and bent inward. A surface 52 is formed by an exposure method, and a highly pure aluminum metal film 53 is deposited on the fluorescent surface 52 by a vapor deposition technique.

Furthermore, metal support pins 55 are installed on the inner surface of the inclined side wall 51a at substantially right angle positions along the tangent line.

Also, it is made of an iron plate having a curved surface and usually having 100,000 to 400,000 small holes at approximately equal intervals to the fluorescent surface 52,
A shadow mask 54 having a color separation function is arranged within the panel 51.

A support band 66 made of an elastic metal material is attached to the outer periphery of the shadow mask 54 so as to be substantially parallel to the side wall 51a of the panel 51.
is engaged with.

The panel 51 having such a shadow mask 54 is
A large diameter portion of a funnel-shaped funnel 51 is integrally joined with a low melting point glass 60, and this funnel 57 is integrally connected to a neck tube 62.

A metal terminal 61 for supplying high voltage electricity is welded to a part of the funnel 57, so that high voltage is supplied from the outside to the inside.

Further, a graphite conductive coating 58 is applied by baking to the inner wall surface of the funnel 57 up to a part of the neck tube 62, and a graphite conductive coating 59 is applied to the outer wall surface of the funnel 57 by trimming the metal terminal 61 into an arc shape. ing.

An electron gun assembly 63 is enclosed within the neck tube 62, and the high voltage is supplied to the shadow mask 54 and the electron gun assembly 63 by means of spring elements 65 and 64.

Note that the panel 51 and the funnel 57 are welded together using the low melting point glass 60 before the electron gun assembly 63 is enclosed.

In order to ensure safety through explosion-proofing, the outer periphery of the side wall of the panel 51 is wrapped and fixed with an explosion-proof metal ring 67 with a predetermined tightening force, and a resin 68 is provided in the gap between the metal ring 67 and the panel 51. is filled.

Next, the features of this invention will be described in detail.

FIGS. 3a and 3b are a perspective view and a cross-sectional view of the panel 51,
In the present invention, the panel 51 includes a spherical portion serving as an effective screen and side walls 51a and 51b on long and short sides connected to the spherical portion.
It consists of

The effective screen size (2) is formed by a rectangular cross-section of the spherical portion, and the bottom portion, that is, the sealing surface 51c, is formed in the same planar shape.

Each of the long side walls 51a and the short side walls 51b is a flat surface that is inclined with respect to the outer periphery.

That is, at the center of each side wall 51a, 51b, a triangular space 51d is formed, as shown in the figure.

Figure 3 shows its central cross section, where the angle θ and height hl are 13v-90° (14 type) glass bulb, forming a space with an angle θ-35° and height h1 = 471 nm. It is something that will be done.

In addition, the height dimension h1 is set lower than the height dimension h (7'1 mm) in the conventional method (Fig. 1), so it is approximately 66 mm.
%It has become.

Therefore, as mentioned above, the inclination angle of the side walls 51a and 51b is 35 degrees, and the triangular empty space area at the center of each side is 20 mm (base size) (inner effective value) and height with respect to the vertical masquerade line of effective surface dimension V. A space having a dimension value of about 35 mm (minus the wall thickness value) is formed.

Further, since the angle between the tangent between the spherical surface and the side wall is greater than 90°, stress strain at a portion of the corner is small.

In this invention, these spaces are used for suspending the shadow mask 54.

That is, the structure in which this space is used to suspend the shadow mask 54 is as shown in FIG.

As already mentioned, the inclined side walls 51a, 51b of the panel 51
A support pin 55 is installed in the right angle direction, and the protruding portion of the support pin 55 has a conical shape.

This support pin 55 engages with an elastic holding piece 68 provided on a support band 66 fixed to the shadow mask 54, and the holding piece 68
It is designed to be firmly supported by its elastic force.

This support pin 55 is connected to the side wall 5 on the four sides of the panel 51, that is, on the long side.
Four or three pieces are planted at each predetermined position on the side wall 51b on the short side.

In terms of position, they do not have to be on the same plane.

This is because there is extra support band 66 provided around the outer periphery of shadow mask 54.

Next, as is clear from FIGS. 4 and 5, the shadow mask 54 has numerous round holes (or rectangular holes) formed by etching technology, but as described above, the outer periphery is a frame. It is supported by a support band 66 having a shape.

In this case, the side of the support band 66 facing the shadow mask 54 becomes a reinforced corner part 66a, and the opposite side forms a skirt flare part 66b substantially parallel to the shadow mask 54.

The support band 66 was conventionally provided perpendicular to the tube axis, but
In these types of electron beams, when the electron beam is deflected, it is incident obliquely and when it hits a vertical side wall, it is reflected in an almost perpendicular direction, so it enters the fluorescent film 52 side and images unnecessary areas. There was a drawback to making comparisons.

However, in this invention, since the support band 66 is provided with an inclination close to the curvature along the deflection angle from the deflection center of the electron beam, the support band 66 that collides with the incident angle forms a right angle, so that This has the advantage of eliminating the image emission caused by the secondary electron beam.

Note that the values of these support bands 66 can be set depending on the size of the color cathode ray tube and the type of deflection angle.

Furthermore, as is clear from FIG. 5, an elastic holding piece 68 that is engaged with the support pin 55 is fixed to the support band 66 at a position corresponding to the support pin 55.

This elastic holding piece 68 consists of a fixing part 68a, an elastic part 68b, an engaging part 68C, and an engaging hole 68d. After setting the interval value between the two elastic holding pieces 68, the fixing portion 68a of the elastic holding piece 68 is welded and fixed together.

Finally, FIGS. 6a and 6b show the explosion-proof system of the present invention in detail, in which the side walls 51a and 51b of the panel 51 and the outer periphery of the large-diameter opening end of the funnel 57 are covered with an explosion-proof metal ring 67. Cover and tighten.

b shows a part of the explosion-proof metal ring 67, which is actually an integral rectangular frame ring, and the side wall 51a of the panel 51,
It is molded along the shape of 51b.

The central part of each side was made one dimension larger to improve the joint strength, making it easy to pass safety standards and other inspections.

Since the central part of each side of the rectangular panel 51 generally has low implosion (pressure resistance) strength, the metal ring 67 of the present invention has enough width to cover it, so the resin 68 is placed in the space. After filling and joining, we were able to obtain strong explosion-proof strength.

The color cathode ray tube of the present invention is constructed as described above and shown in the drawings, including the side wall 51a of the panel 51.

Since the inclination angle of the electron beam 51b and the deflection angle of the electron beam are perpendicular to each other, and the supporting band 66 of the shadow mask 54 is also inclined along this angle, the intrusion of the electron beam from the interval value is ignored and the electron beam is projected onto the image screen. The diffused reflection phenomenon disappeared.

Therefore, the frame 14 and shielding plate 18, which were conventionally necessary, are no longer necessary, making the structure simple and inexpensive.

That is, since the angle of inclination between the screen display portion of the panel 51 and the side wall is an obtuse angle, stress and strain are small for a glass panel, and implosion factors are alleviated.

Further, since the triangular space formed by the screen display section and the inclined side wall can be large, the means for suspending the shadow mask 54 can be configured with ample margin.

Furthermore, the shadow mask 54 is provided with a support band 66, and this support band 66 is formed with a skirt flare portion 66b, which prevents deformation of the shadow mask, improves mechanical strength, and prevents electron beams from entering from the gap. Therefore, it is possible to obtain the effect of preventing the reflection of secondary electrons caused by the inclined portion of the mask against the deflection of the electron beam from affecting the image plane.

Moreover, the side walls 11a and 11b of the panel 11 have a large surface area,
Therefore, the metal rings 67 are also large, and the surface area filled with the resin 68 between the metal rings 61 can be increased, so that the strength due to pressure implosion resistance is significantly improved.

It goes without saying that the present invention is not limited to color picture tubes for televisions.

As explained above, according to the present invention, a color cathode ray tube of great practical value can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional color cathode ray tube, FIG. 2 is a sectional view showing a color cathode ray tube according to an embodiment of the present invention, and FIGS. 3a and 3b are panels of the color cathode ray tube in FIG. FIG. 4 is a sectional view showing the suspension structure of the shadow mask on the panel, FIG. 5 is a perspective view showing the main parts of the shadow mask on an enlarged scale, and FIG. 6 a
, b are a sectional view and a perspective view showing the vicinity of the explosion-proof metal ring. 51...Panel, 51a...Side wall, 5
2...Fluorescent surface, 53...Aluminum metal film, 54...Shadow mask, 55...
... Support pin, 57 ... Funnel, 58
, 59...Graphite conductive coating, 61...Metal terminal, 62...Neck tube, 63...
Electron gun, 66... Support band, 66a...
Part of reinforced corner, 66b... Part of skirt flare, 67... Explosion-proof metal ring.

Claims (1)

[Claims] 1 A panel consisting of a screen display part with a fluorescent surface formed on its inner surface, a side wall connected to the screen display part and bent so as to be inclined so that the inner side forms an obtuse angle; a shadow mask disposed at a predetermined distance from the panel and having a support band on its outer periphery, the support band being locked to a support pin protruding from the side wall via an elastic holding piece; a joined funnel-shaped funnel, a neck tube connected to the funnel and containing an electron gun, and an explosion-proof metal ring that is tightened to cover the outer periphery of the side wall of the panel and a part of the outer periphery of the funnel; A color cathode ray tube comprising a resin filling a gap between the metal ring and the panel and funnel.