JPS5935142B2 - color picture tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a color picture tube using a bulb with a simplified structure using a shallow panel with a spherical surface, which achieves weight reduction, mechanical precision, structural strength, and The present invention relates to a high-precision, high-safety, and low-cost color picture tube that has increased explosion-proof strength and is configured in a tube-like manner by using ceramic funnel members and metal elements implanted in the panel.

FIG. 1 is a schematic structural diagram of a shadow mask type color picture tube that has been put into practical use up until now.

In the figure, a panel (also called a face plate) is formed of a face part 101, which is an image display part, and a side wall part 102. On the inner surface of the side wall part 102, there is a metal or ceramic plate for suspending a shadow mask. It has a panel pin 103.

λ is a funnel-shaped funnel, which is the cone part 201
, and has an electron gun 8 inside a neck portion 203 formed in a small diameter portion of the cone portion.

3 is a shadow mask, which is usually made of an iron plate with 100,000 to 400,000 small holes, and has a color separation function.

Side wall portion 102 of panel 1 and adhesive surface portion 2 of funnel 2
02 is joined with solder glass 4.

The operation of this type of color picture tube is well explained in literature, so it will be omitted here.

As is clear from FIG. 1, the conventional panel ↑ has a planar shape having a face portion 101 and side wall portions 102.

When these panel members are molded using a mold in a glass molding factory, the height dimension of the side wall portion 102 is regulated, which may reduce the yield during melt molding or cause stress strain even after molding. This caused damage to the panel 1.

In addition, the reference pins for suspending the shadow mask structure, that is, the panel pins 103, are also planted on the side wall 102 on the same plane with their dimensions and positions regulated, so the equipment required is enormous, which improves both cost and work efficiency. It is well known that there is no such thing.

Further, since the shadow mask 3 is formed from a thin iron plate, when the mask is suspended and supported, it is attached to a frame 104 having a strong L-shaped cross section.

During operation, the shadow mask 3 is heated (about 80°C) by the electron beam emitted from the electron gun.
It expands in the horizontal and vertical axes perpendicular to the tube axis.

Since the thermal conductivity changes depending on the difference in the thickness of the iron plate between the frame 104 and the shadow mask 3, the position of the opening made in the shadow mask and the inner surface of the face part 101 to which the phosphor is attached is becomes distorted and degrades the video quality.

In order to compensate for these as much as possible, metal members with different thermal expansion (
A bimetal) 105 is welded and fixed along the side wall of the frame 104 to provide a shadow mask 3 for heat conduction during operation.
I am trying to correct the deviation.

However, since these methods require thermal correction, it is difficult to accurately align the three-color dots or stripes of the phosphor with one opening in the shadow mask 3, and they have the drawback of requiring complicated members. .

For suspension, an elastic metal element (spring) 106
The panel pin 103 is engaged with the panel pin 103 via the .

These panel pins 103 are usually welded to the center of the long and short sides of the rectangular side wall 102, and the support structure of the shadow mask 3 is also welded to each side of the shadow mask. Since it is located in the center of the frame, there is a drawback that there is no support point and the image fluctuates, especially at the diagonal corners, which causes color shift in the image.

The present invention provides a color picture tube that eliminates the above-mentioned drawbacks of the conventional art, and will be described in detail below with reference to FIGS. 2 to 6.

FIG. 2 shows the panel shape of the present invention, and is a perspective view showing a part of a substantially rectangular panel 400 in which a position-regulating element 300 made of metal or the like is implanted in the periphery.

A metal element 300 is implanted on the diagonal of the rectangular shallow dish panel, that is, near a corner, by high frequency welding or the like.

The shallow pan panel has a flat seal 412.

At least three of the metal elements 300 are welded to each other for position regulation.

Details of the metal element 300 are shown in FIG. 3a. As shown in b, the first wing piece 30L301' is formed with a fan-shaped opening at an angle θ.

This first wing piece is provided with semicircular beads 305, 305', is formed to be flexible, and is adapted to engage with a reference portion 501 provided on a funnel 500 shown in FIG.

When engaged, the first wing pieces 301, 301' in FIG. 3 are deformed and bent inward as shown by dotted lines 301a, 301'a.

The lower ends of the beads 305 and 305' have a bottom part 302 having trapezoidal wing support parts 303 and 303', and the bottom part 302 has a trapezoidal cylinder 30 protruding from the center thereof.
6 is provided.

This trapezoidal cylinder 306 serves as a reference when suspending and engaging the shadow mask.

Further, the second wing pieces 304, 304' at the lower end directly connected to the wing support parts 303, 303' have a partially cutout part 30.
7,307' and is effective in preventing removal when welded to a glass panel.

FIGS. 4a and 4b are a partial front view and a partial detailed cross-sectional view when a shadow mask 402 of the present invention is mounted on a glass panel 400. FIG.

The shadow mask 402 has a reinforcing support part 405 on its side wall part 402a, and a metal spring 403 having a U-shaped cross section is welded to a support plate 405a vertically erected on the reinforcing support part 405 along the tube axis. .

By engaging this metal spring 403 with the element 300 implanted in the glass panel 400, the shadow mask is suspended and supported.

The longitudinal positioning of the U-shaped metal spring 403 is as follows:
It is determined by the distance between the inner surface of the panel 400 and the outer spherical surface of the shadow mask 402.

The stop side plate 403a of this U-shaped metal spring 403 has a circular hole that fits into the trapezoidal cylinder 306 of the metal element 300, and can be moved by an angle θ as shown by the dotted line in order to remove the shadow mask 402.

The springs 403 fixedly support the shadow mask 402 by three or four tubular bodies.

Figure 5 is a diagram showing a funnel made of ceramics, a
1 is a plan view thereof, b is a vertical sectional view thereof, and C is an enlarged perspective view of a main part.

That is, this funnel 500 is formed in a figure 7 shape, that is, two planes forming an acute angle to each other, near the large-diameter opening at a location corresponding to the position of the funnel 300 installed in the panel 400 as shown in FIG. and a reference portion 5 having an inclined surface that gradually becomes narrower from the panel side toward the neck side.
01.

A metal anode terminal 504 is sealed to the side wall of the cone portion 505 of the funnel by metallization welding.

The large-diameter round part A-A' plane perpendicular to the tube axis C of the cone part 505 coincides with the sealing surface 412 of the panel 400,
Similarly, the BB' plane of the small diameter opening perpendicular to the tube axis C coincides with the part to be welded by the neck 503 and the solder glass 502.

A ceramic funnel 500 is thus formed.

Since the reference part 501 is made of ceramic, unlike glass, it has high mechanical strength, so there is no risk of damage even if the metal element 300 is strongly pressed and engaged, so that the position of the panel 400 and the funnel 500 can be controlled. can be maintained accurately and with high precision.

FIG. 6 shows a partially cutaway sectional view of an embodiment of the color picture tube of the present invention.

Fluorescent material (red, blue, green) 4 on a glass panel 400
10 to form an aluminum vapor deposition film (not shown).

Side wall portion 402a and reinforcing support portion 405 of shadow mask 402 that engage with metal element 300 implanted in panel 400
The shadow mask 402 and the panel 4 are fixed by welding.
After setting a predetermined distance from the inner surface of 00 and determining the position, the spring 403 having a U-shaped cross section is attached to the metal element 30.
0, and the reinforcing support portion 405 and the spring 403 are supported by welding.

Ceramic funnel cone 505 and neck 5
03 has been welded and fixed in advance with solder glass 502,
The engagement position of the tip of the metal element 300 is regulated by the reference part 501 formed inside the cone part 505 along the tapered shape, and the metal element 300 is sealed and supported with a solder glass 406 interposed therebetween.

During this engagement, the wing portion 30L301 of the metal element 300
' is flexible, so it is easy to attach the metal element 300 of the panel 400 and the reference part 501 of the funnel 500.

An electron gun assembly 80 is built into the glass neck 503 and is precisely aligned with one opening of the shadow mask 402 incorporated in the panel and the three color positions of the phosphor film 410. It will be done.

In such a color picture tube, the mechanical precision allows accurate positioning, so the electrical characteristics are excellent, and the color shift phenomenon is prevented, the image quality is improved, the sharpness is increased, and the color effect is outstanding. .

Also, the side wall portion 402a of the shadow mask 402 is attached to the panel 40.
Since it is widened to the limit on the inner surface of 0, even when the electron beam is overscanned, the effect of preventing secondary electrons from electrons can be obtained.

(Previously, aluminum foil members were used.

) That is, the color picture tube of the present invention eliminates the need for a thermal expansion metal bimetal and a mask frame, and has excellent economical effects, and also has excellent shape and mechanical strength because it uses a ceramic funnel.

The embodiments described above are merely representative examples, and it goes without saying that various modifications can be made within the scope of the claims.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway elevational view of a conventional color picture tube, Figures 2 to 5 are for explaining the present invention, Figure 2 is an enlarged perspective view of the main part of the panel, and Figure 3 a. is a side view of the position regulating element, Figure 3 is a plan view of the position regulating element, Figure 4 a is a partial front view of a panel incorporating a shadow mask, and Figure 4 is B of Figure 4 a. - Cross-sectional view taken along line B', Figure 5a
5 is a plan view of the funnel, FIG. 5 is an explanatory partially cutaway elevational view of the funnel and neck portion, FIG. 5C is a partially enlarged perspective view of the funnel, and FIG. 6 is a color picture tube according to the present invention. FIG. 1.200,400...Panel, 2,500・
・・・・・・Funnel, 3,402・・・・・・
Shadow mask, 300...Position regulating element,
501...Reference part.

Claims (1)

[Claims] 1 A shallow dish-shaped panel with a phosphor film formed on the inner surface and a sealing surface on the periphery, and a flexible wing section planted near the inner corner of this panel so as to protrude from the sealing surface. a metal spring having a hole that fits into the trapezoidal tube of the position regulating element, a shadow mask suspended and engaged via a support plate and a reinforcing support part; It has two flat inclined surfaces forming an acute angle that come into contact with the wing portions of the regulating element, a reference part that engages with the position regulating element is provided, and a large diameter opening is joined to the sealing surface part. 1. A color picture tube comprising: a ceramic funnel; and a neck, which is joined to a small-diameter opening of the ceramic funnel and has an electron gun assembly built therein.