JP2001093445A - Funnel of cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a funnel of a cathode-ray tube which can prevent cracks from occurring in a moil part of the funnel when manufactured, improve productivity, and improve deflection sensitivity when an electron beam is deflected by a deflection yoke. SOLUTION: A funnel of a cathode-ray tube comprises a body 31, a cone part 32 which is formed under the body 31 in one body therewith, a moil part 33 which extends from the cone part 32 and formed in one body with the cone part 32, and a neck part 35 which is joined with an end portion of the moil part 33 and has a cylindrical shape thinner than the moil part 33. Cracks in the moil part 33 are prevented from occurring when molding the funnel 30. Deflection sensitivity is improved when an electron beam is deflected by a deflection yoke that is attached to the cone part 32. A room in forming a hole through which the electron beam of an electrode of an electron gun that is attached to the neck part 35 passes can be also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube and, more particularly, to a cathode ray tube funnel having an improved neck portion for mounting an electron gun.

[0002]

2. Description of the Related Art In general, a cathode ray tube has the disadvantage that it is relatively large and heavy in comparison with other display devices such as a PDP and an LCD, but it has a high resolution and brightness of an image and a long life. It also has long strengths. In recent years, there has been no development of an alternative display device having such advantages as a cathode ray tube, and in response to the trend of flattening and increasing the size of the display device, the trend of flattening and increasing the size of the cathode ray tube has been increasing. It is in.

FIG. 5 shows an example of such a conventional cathode ray tube.

Referring to the drawings, a conventional cathode ray tube includes a panel 12 having a fluorescent film 11 formed on an inner surface thereof, a shadow mask frame assembly 13 mounted inside the panel 12, and a sealing member. A funnel 15 having a neck portion 15a on which the electron gun 14 is mounted and an electron gun 1 mounted on a cone portion 15b of the funnel 15
Deflection yoke 1 for deflecting the electron beam emitted from electron beam 4
6 is provided.

[0005] The conventional cathode ray tube configured as above is
10 ^{-7 to} 10
Maintaining a high vacuum of ^-9 torr, large cathode ray tubes have thick panels and funnels for structural strength to withstand such high vacuum inside.

FIGS. 6 and 7 show an example of a method for manufacturing a funnel of such a large cathode ray tube.

Referring to the drawings, a funnel 15 is manufactured using upper and lower molds 21 and 22 having a cavity in the shape of the funnel 15 excluding the neck 15a.
That is, the molten glass is poured into the lower mold 22 in a state where the upper and lower molds 21 and 22 are separated from each other, and then the upper and lower molds 21 and 22 are molded to remove the neck portion 15a. The funnel 15 is formed. After completion of the molding, the upper and lower molds are divided to separate the funnel 15 excluding the molded neck 15a, and then cooled.
As described above, the funnel 15 excluding the neck portion 15a, that is, the moir portion (moil por) to which the neck portion 15a is joined.
When the manufacture of the funnel 15 having the option 15b is completed, the neck 15a, which has been manufactured separately, is joined to the moir 15b of the funnel 15.

In the funnel 15 described above, the thickness of the moir portion 15b and the thickness of the neck portion 15a increase with the thickness of the main body 15d. When the neck portion 15a and the cone portion 15c are thickened as described above, the deflection sensitivity of the electron beam emitted from the electron gun 14 to be deflected by the deflection magnetic field of the deflection yoke 16 is deteriorated, as shown in FIG. In order to prevent such a deterioration in deflection sensitivity, the cone 15c of the funnel 15 on which the deflection yoke is mounted is formed thin in a large cathode ray tube.

However, in the conventional cathode ray tube constructed as described above, since the thickness of the body 15d of the funnel 15 and the thickness of the foil portion 15b are different, the difference in the heat shrinkage due to the cooling during the molding of the funnel causes There was a problem that cracks occurred in the portion 15b.

[0010] In particular, the thickness of the neck portion 15a is 2.2 mm.
Below, there is a problem that fine cracks occur in the moir portion 15b, making the production of the funnel 15 more difficult and lowering the productivity.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to prevent cracks from occurring in a moil portion at the time of manufacturing a funnel, thereby improving productivity. It is an object of the present invention to provide a cathode ray tube funnel capable of improving the deflection sensitivity when deflecting an electron beam by a deflection yoke.

[0012]

According to one aspect of the present invention, there is provided a cathode ray tube funnel comprising: a main body; a cone portion integrally formed at a lower portion of the main body; A moil portion extending and integrally formed, and a cylindrical neck portion thinner than the moil portion and joined to an end of the moil portion.

A funnel for a cathode ray tube according to another aspect of the present invention includes a main body, a cone portion integrally formed at a lower portion of the main body, a moil portion extending from the cone portion and integrally formed; And a cylindrical neck portion having an inner diameter larger than that of the moil portion, which is joined to an end of the portion.

Further, the funnel of the cathode ray tube is characterized in that the outer diameter of the neck portion is smaller than the outer diameter of the moir portion.

The funnel of the cathode ray tube is characterized in that the outer diameter of the neck portion is the same as the outer diameter of the moir portion.

[0016]

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

FIG. 1 is a view showing one embodiment of a funnel of a cathode ray tube according to the present invention.

As shown in the figure, the funnel 30 has a main body 31 expanded upward, a cone portion 32 located below the main body 31, and a moir portion 33 located below the cone portion 32. . The main body 31 and the cone 32
The moir part 33 is integrally formed by a single mold, and a cylindrical neck part 35 manufactured separately is fused to an end of the moir part 33.

Here, the thickness T1 of the moir part 33 is:
In order to prevent the occurrence of cracks due to the difference in the amount of heat shrinkage between the moir part 33, the main body 31 and the cone part 32,
It is desirable to form the main body 31 and the main body 31 so as not to have a great difference. With this configuration, it is possible to prevent a crack due to a difference in the amount of heat shrinkage between the foil portion 33, the main body 31, and the cone portion 32 during a cooling stage during the manufacturing process of the funnel 30 excluding the neck portion 35.

The thickness T2 of the neck portion 35 is smaller than the thickness T1 of the moil portion 33. Thus, when an electron beam (not shown) emitted from an electron gun (not shown) is deflected by a deflection yoke (not shown) mounted on the cone portion 32, the deflection sensitivity can be improved. Preferably,
When the thickness of the neck portion 35 is 0.15 mm,
Should not be less than 2.2 mm.

Further, preferably, the inner diameter (NID) of the neck portion 35 is set to be equal to the inner diameter (NID) of the moil portion 33 so that the electrode of the electron gun mounted therein has a margin for forming an electron beam passage hole. MID). More preferably, the outer diameter (NOD) of the neck portion 35 is smaller than the outer diameter (MOD) of the moil portion 33 in order to facilitate insertion of the deflection yoke.

As described above, the neck portion 35 and the moil portion 3
The relationship between the inner and outer diameters of 3 is not limited by the above-described embodiment, but can be varied into various forms depending on the deflection sensitivity of the deflection yoke, the mounting state of the deflection yoke and the electron gun, and the like.

For example, as shown in FIG. 2, the inner diameter of the neck portion 35 and the inner diameter of the moil portion 33 can be formed to be the same, and the outer diameter of the neck portion 35 can be formed smaller than the outer diameter of the moil portion 33.

Further, as shown in FIG.
5, the inner diameter of the neck portion 35 and the outer diameter of the moil portion 33 can be made the same.

Further, as shown in FIG. 4, the inner diameter of the neck portion 35 can be formed smaller than the inner diameter of the moir portion 33, and the outer diameter of the neck portion 35 can be formed smaller than the outer diameter of the moir portion 33.

[0026]

According to the present invention, it is possible to prevent cracks from occurring in the moil portion during the formation of the funnel, to improve the deflection sensitivity of the deflection of the electron beam by the deflection yoke attached to the cone portion, and to attach the electron beam to the neck portion. Of the electron beam passing hole of the electrode of the electron gun to be formed can be improved.

Although the present invention has been described with reference to the embodiments shown in the accompanying drawings, it is by way of example only.
Those skilled in the art will recognize that various modifications and equivalent embodiments are possible. Therefore, the true scope of the present invention should be determined only by the spirit and scope of the appended claims.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a funnel of a cathode ray tube according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the funnel of the cathode ray tube according to the present invention.

FIG. 3 is a sectional view showing still another embodiment of the funnel of the cathode ray tube according to the present invention.

FIG. 4 is a sectional view showing still another embodiment of the funnel of the cathode ray tube according to the present invention.

FIG. 5 is a sectional view showing a general cathode ray tube.

FIG. 6 is a sectional view showing a mold for manufacturing a conventional funnel of a cathode ray tube.

FIG. 7 is a cross-sectional view showing a connection relationship between a moir portion and a neck portion in a conventional funnel of a cathode ray tube.

[Explanation of symbols]

 Reference Signs List 30 funnel 31 main body 32 cone part 33 moir part 35 neck part

Claims (4)

[Claims] 1. A main body, a cone portion integrally formed at a lower portion of the main body, a moil portion extending from the cone portion and integrally formed,
A funnel for a cathode ray tube, wherein the funnel is joined to an end of the moir part and has a cylindrical neck part thinner than the moir part. 2. A body, a cone portion integrally formed at a lower portion of the body, a moil portion extending from the cone portion and integrally formed, and joined to an end of the moil portion. A funnel for a cathode ray tube, comprising a cylindrical neck portion having an inner diameter larger than the moir portion. 3. A funnel for a cathode ray tube according to claim 2, wherein an outer diameter of said neck portion is smaller than an outer diameter of said moir portion. 4. The funnel for a cathode ray tube according to claim 2, wherein an outer diameter of the neck portion is the same as an outer diameter of the moir portion.