KR100785387B1 - Funnel for slim type cathode ray tube - Google Patents

Abstract

According to the present invention, in a funnel of a slim type cathode ray tube formed with a deflection angle of an electron beam of 120 degrees or more and divided into a body portion and a yoke portion, the yoke portion is 25% to 55 in a direction from the neck seal of the yoke portion to the body portion. By the length ratio of the long axis LA and the short axis SA of the yoke part to be 100% or less at this point, stress concentration may be prevented at the end of the diagonal axis of the yoke part even if the total length of the tube is reduced.

Cathode ray tube, tube, funnel, yoke, diagonal axis, major axis, minor axis, stress

Description

Funnel for slim type cathode ray tube}

1 is a side view of a partially cut away state in which a cathode ray tube of the prior art is shown;

2 is a front view showing a funnel of a cathode ray tube of the prior art,

3 is a side view showing a funnel of a cathode ray tube of the prior art,

4 is a front view showing a funnel of a slim cathode ray tube according to the present invention;

5 is a side view showing the long axis direction and the short axis direction of the funnel of the slim cathode ray tube according to the present invention.

<Explanation of symbols on main parts of the drawings>

30: funnel 31: body

32: York section

The present invention relates to a funnel of a slim cathode ray tube, and more particularly, to a funnel of a slim cathode ray tube capable of preventing stress concentration on the funnel when the deflection angle of the electron beam is configured to be 120 degrees or more.

1 is a cross-sectional view showing a structure of a conventional cathode ray tube, as shown in the cathode ray tube, the panel 1 and the funnel 2 are largely bonded to each other to form a tube 10.

A shadow mask 3 is provided inside the panel 1, which is supported by a frame 4 so as to be substantially parallel to the panel 1, and this frame 4 is provided. ) Is installed on the panel 1 via a spring 5. The inner side of the funnel 2 is provided with an inner shield 6 which blocks the external geomagnetic field so that the electron beam is not bent by the external geomagnetic field.

An electron gun 7 for generating an electron beam is inserted in the rear of the funnel 2, and a deflection yoke 8 for deflecting the electron beam to approximately 110 degrees or less is provided outside the yoke portion.

In this cathode ray tube, the electron beam emitted from the electron gun 7 is deflected up and down and left and right by the deflection yoke 8 and proceeds toward the panel 1, and passes through the through hole of the shadow mask 3. Next, the fluorescent surface 9 coated on the inner surface of the panel 1 is reached. At this time, the image is reproduced by the fluorescent surface 9 emitting light by the energy of the electron beam, so that the user can see the reproduced image through the panel 1.

Meanwhile, in the cathode ray tube as described above, the panel 1 and the funnel 2 are joined to each other through a frit sealing process, and then the electron gun 7 is inserted into the end of the funnel 2 in the encapsulation process, and the exhaust process is performed. After the tube 10 is made in a vacuum state, it is manufactured by encapsulation.

Here, when the tube 10 is evacuated, the panel 1 and the funnel 2 are subjected to a significant amount of tensile and compressive stress.

2 and 3 are a front view and a side view of the above-described conventional funnel, in which the yoke portion 2y of the funnel 2 is mainly formed in a round shape, but in recent years, the deflection of the deflection yoke 8 is increased. In order to change the rectangular RAC structure, the RAC type is designed to maintain an angle of about 20 degrees or more in the direction of the panel 1 in the top of round (TOR).

In the cathode ray tube having a deflection angle of 110 degrees or less, the stress concentration phenomenon applied to the yoke portion 2y of the funnel 2 is generally smaller than the stress concentration applied to the panel 1, so that it is a durability test according to external impact. The test did not have a significant effect.

However, with the development of a slim cathode ray tube having an electron beam deflection angle of 120 degrees or more, as the electric field of the tube 10 is reduced, the electric field of the panel 1 and the funnel 2 is inevitably reduced. Since the internal volume is also reduced, a lot of stress is generated in the panel 1 and the funnel 2 for the constant vacuum amount.

In particular, in the case of the funnel 2, it is generally difficult to shorten the length of the yoke portion 2y to which the deflection yoke 8 is fastened, so that the overall length is reduced by reducing the length of the body portion 2b. However, the shrinkage of the body portion 2b of the funnel 2 results in the stress being concentrated at the end of the diagonal axis of the yoke portion 2y, which is problematic in that the explosion-proof property against external shock is weak.

Therefore, there is a need for a design capable of preventing the phenomenon of stress concentration in the diagonal portion of the yoke portion 2y while reducing the overall length of the tube 10.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and by reducing the overall length of the tube by appropriately designing the length ratio of the long axis LA and the short axis SA for each predetermined section of the yoke part from the neck seal of the yoke part to the body part. The purpose of the present invention is to provide a funnel of a slim cathode ray tube capable of concentrating and eliminating the maximum stress of the diagonal axis of the yoke to improve explosion-proof characteristics.

The present invention for solving the above problems is formed so that the deflection angle of the electron beam is more than 120 degrees, in the funnel of the slim cathode ray tube divided into the body portion and the yoke portion, the yoke portion is the neck seal (opposite end opposite to the body portion) When the distance from the neck seal toward the body portion is 100%, the length of the long axis LA is formed to be shorter or equal to the length of the short axis SA at a point of 25% to 55%.

The yoke portion is characterized in that the length of the long axis LA is formed to be longer than or equal to the length of the short axis SA from the neck seal to the point of 0% to less than 25% in the body portion direction.

The yoke portion is characterized in that the length of the long axis (LA) is formed to be longer than or equal to the length of the short axis (SA) from the neck seal in the direction of the body portion from 55% over 100% point.

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

4 is a front view showing a funnel of the slim cathode ray tube according to the present invention, Figure 5 is a side view of the funnel of the slim cathode ray tube according to the present invention, the side view in the long axis direction is shown in solid line and the side view in the short axis direction in the hidden line Shown.

4 and 5, the funnel 30 of the slim cathode ray tube according to the present invention has an angle at which the electron beam deflection angle is 120 degrees or more, and a panel (not shown) and the funnel 30 are joined to each other. The overall length of the tube is applied to a slim cathode ray tube formed to be considerably shorter than the full length of the tube of a conventional cathode ray tube.

The funnel 30 is divided into a body part 31 and a yoke part 32 around a TOR (Top of Round), and the body part 31 is a seal edge surface SE joined to the panel in the TOR. ), And the yoke portion 32 is a portion from the TOR to the neck seal NS.

The yoke portion 32 of the funnel 30 is a portion to which the deflection yoke is fastened, and its cross section includes a long axis LA, a short axis SA, and a diagonal axis DA.

Here, the long axis LA of the yoke part 32 is a direction of a side that is formed relatively longer among a horizontal side and a vertical side when viewed from the front, and a short axis SA is a direction of a side that is formed relatively shorter, and the diagonal axis DA is a direction connecting the point where the long axis LA and the short axis SA meet at the center of the cross section.

Since the yoke portion 32 is difficult to reduce the length thereof, the length of the body portion 31 is mainly reduced. In this case, the diagonal axis DA of the yoke portion 32 is reduced due to the reduction of the body portion 31. It is confirmed through experiments that the stress is concentrated at the end, a design is required to reduce the stress at the end of the diagonal axis DA of the yoke part 32 so as not to be easily damaged by an external impact.

Accordingly, in the present invention, the long axis LA of the yoke part 32 may sufficiently correspond to the stress concentration at the end of the diagonal axis DA of the yoke part 32 according to the length reduction of the body part 31 in the funnel 30. ) And the ratio of the length of the single axis (SA) is properly designed to prevent stress concentration.

That is, when the yoke portion 32 is 100% of the distance from the neck seal (NS) to the TOR in the direction of the body portion 31, the point that is less than 25% from 0% (section A) ) Is formed such that the length of the long axis LA is longer than or equal to the length of the short axis SA. In other words, the length ratio LA / SA of the long axis LA and the short axis SA is 100% or more.

On the other hand, the yoke portion 32 is 25% to 55% of the point when the distance from the neck seal (NS) (Neck Seal) to the TOR in the direction of the body portion 31 to 100% (Section B) Is formed such that the length of the long axis LA is shorter than or equal to the length of the short axis SA. In other words, the length ratio LA / SA of the long axis LA and the short axis SA is 100% or less.

In addition, when the yoke portion 32 is 100% of the distance from the neck seal (NS) to the TOR in the direction of the body portion 31, it is 100% from the point exceeding 55% (section C). As in the 'section A', the length of the long axis LA is formed to be longer than or equal to the length of the short axis SA. In other words, the length ratio LA / SA of the long axis LA and the short axis SA is 100% or more.

The funnel 30 according to the present invention configured as described above will be described through the experimental results described in [Table 1] and [Table 2].

TABLE 1

TABLE 2

In [Table 1] and [Table 2] 'From NS' is the distance from the neck seal NS of the yoke portion 32 from the stress tested in the direction of the body portion 31, 'Yoke position' is It is a point stress-tested from the neck seal NS of the yoke part 32 toward the body part 31, and a "stress" is a stress at the diagonal axis DA of the yoke part 32.

When comparing [Table 1] and [Table 2] as described above are as follows.

First, Table 1 shows all points (Yoke position: 0% to 100%) of the yoke portion 32 in the direction of the body portion 31 from the neck seal NS of the yoke portion 32 as in the prior art. In the case where the length ratio LA / SA of the long axis LA and the short axis SA of the yoke part 32 is 100% or more, the end stress of the diagonal axis DA of the yoke part 32 is By being 4.7 to 10.2 Mpa, the end stress of the diagonal axis DA of the yoke portion 32 is relatively high.

[Table 2] shows the yoke position of the yoke portion 32 in the direction of the body portion 31 from the neck seal NS of the yoke portion 32 in the direction of 25% to 55% (B section). ), The length ratio (LA / SA) of the long axis LA and the short axis SA of the yoke part 32 is 100% or less, and other points, that is, the points where the yoke position is less than 25% (section A) At the point exceeding 55% (section C), the length ratio LA / SA of the long axis LA and the short axis SA of the yoke part 32 is 100% or more. By the end stress of the diagonal axis DA of 4.0) is 4.0 to 8.7 Mpa, it can be seen that the end stress of the diagonal axis DA of the yoke part 32 is relatively reduced compared to [Table 1].

The funnel of the slim cathode ray tube according to the present invention constructed and operated as described above is designed by appropriately designing the length ratio of the length and length of the length and length of the yoke portion of the yoke portion at each point of the yoke portion from the neck seal of the yoke portion to the body portion. According to the reduction of the overall length of the yoke portion has the advantage that can prevent the phenomenon of stress concentration on the diagonal axis end to improve the explosion-proof characteristics.

Claims (3)

In the funnel of the slim type cathode ray tube formed so that the deflection angle of the electron beam is 120 degrees or more, and divided into a body portion and a yoke portion, The yoke part is 100% of the distance from the neck seal (Neck Seal) opposite to the body part in the direction of the body part, and when the yoke part is viewed from the front, the long axis among the horizontal axis and the vertical axis is called the major axis (LA). When it is shortened (SA), The funnel of the slim cathode ray tube, characterized in that the length of the long axis (LA) is formed to be shorter or equal to the length of the short axis (SA) at a point that is 25% to 55% in the direction of the body portion from the neck seal. The method of claim 1, The yoke portion of the slim cathode ray tube, characterized in that the length of the long axis (LA) is formed to be longer than or equal to the length of the short axis (SA) from the neck seal in the direction of the body portion from 0% to less than 25%. Funnel. The method according to claim 1 or 2, The yoke portion of the slim cathode ray tube, characterized in that the length of the long axis (LA) is longer than or equal to the length of the short axis (SA) from the neck seal in the direction of the body portion from 55% to 100% point. Funnel.

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