KR100751307B1 - Cathode ray tube and manufacturing method thereof - Google Patents

Abstract

A cathode ray tube, comprising: a panel having a fluorescent film formed on an inner surface thereof; A funnel sealed to the panel and including a neck portion having an electron gun receiving region and a sealing region; A stem having a plurality of stem pins applied to each electrode of the electron gun and supported by a stem mount, respectively, wherein an inner diameter of the sealing region of the neck portion is larger than an inner diameter of the electron gun receiving region, and positioned inside the neck portion. The diameter of the inner stem pin circle according to the arrangement of the inner stem pins is smaller than the diameter of the outer stem pin circle according to the arrangement of the outer stem pins located outside the neck portion, and the sealing area of the neck portion at the middle of the height of the stem mount. The cathode ray tube, characterized in that the horizontal length to the inner surface of the greater than or equal to 1.0mm and less than or equal to 2.0mm.

Description

Cathode ray tube and manufacturing method thereof

1 is a longitudinal sectional view showing the main part of a conventional cathode ray tube;

Figure 2a is a cross-sectional view showing the configuration of a conventional stem,

2B is a plan view showing the structure of a conventional stem;

Figure 2c is a bottom view showing the configuration of a conventional stem,

3 is a cross-sectional view showing a state in which a conventional stem is sealed to the neck portion of the cathode ray tube,

4 is a cross-sectional view showing a state where a conventional stem is sealed to the neck portion of another cathode ray tube;

Figure 5a is a cross-sectional view showing the configuration of the stem of the cathode ray tube according to an embodiment of the present invention,

Figure 5b is a plan view showing the configuration of the stem of the cathode ray tube according to an embodiment of the present invention,

Figure 5c is a bottom view showing the configuration of the stem of the cathode ray tube according to an embodiment of the present invention,

6A is a cross-sectional view of the neck portion before the stem of FIG. 5A is coupled to the neck portion of the cathode ray tube;                 

Figure 6b is a cross-sectional view showing a state where the stem and neck portion before the stem of Figure 5a is sealed to be coupled to the neck portion of the cathode ray tube,

Fig. 6C is a cross-sectional view showing a state in which the stem of Fig. 5A is sealed to the neck portion of the cathode ray tube.

<Explanation of symbols for main parts of the drawings>

9, 39 ... Neck 6, 30 ... Stem

11, 31 ... flange 12, 32 ... exhaust pipe

13, 33 ... stem pin 13a, 33a ... inner stem pin

13b, 33b ... outer stem pin 33c ... middle

15, 34 ... Stemmount D1 ... Internal diameter of the electron gun receiving area of the neck

D2 ... Inner diameter of the sealing area of the neck part D2 ... Outer diameter of the electron gun receiving area of the neck part

Φ1 ... diameter of inner stem pin circle Φ2 ... diameter of outer stem pin circle

Φ3 ... diameter of stem flange Φ4 ... diameter of stemmount

The present invention relates to a cathode ray tube and a method of manufacturing the same, and more particularly, to a neck portion of a funnel constituting the cathode ray tube, a stem sealed thereto, and a sealing method thereof.

In general, a cathode ray tube is a panel in which a phosphor layer 2 is formed on an inner surface of the cathode ray tube and a shadow mask 3 is fixed to be maintained at a predetermined distance from the phosphor layer 2. (1), a neck (9) and a cone (18) are formed and a funnel (4) sealed to the panel (1), and accommodated in the neck (9) to emit an electron beam (7) It consists of an electron gun (5), a deflection yoke (8) fixed to the cone portion (18), and a stem (6) on which the electron gun (5) is mounted and sealed at the end of the neck portion (9).

Referring to the operation principle of the cathode ray tube, first, when a heater (not shown) installed inside the cathode of the electron gun 5 generates heat, electrons are emitted from the oxide coated on the upper surface of the cathode. Next, the electrons emitted from the cathode pass through each of the electrodes arranged at a predetermined interval to form an electron beam 7 having a desired characteristic. The electron beam 7 thus formed is deflected by the magnetic field formed by the deflection yoke 8 and then passes through the shadow mask 3 to collide with the phosphor layer 2 applied on the inner surface of the panel 1 to emit the phosphor. Therefore, the image is reproduced.

In order for the above-described operation to be performed smoothly, the inside of the cathode ray tube must be maintained in a vacuum state. For this purpose, a plurality of stem pins 13 for supplying power to the electron gun 5 and an exhaust pipe 12 for exhaust are provided. The formed stem 6 is sealed at the end of the neck portion 9, the inside of the cathode ray tube is vacuumed through the exhaust pipe 12, and the exhaust pipe 12 is melted and sealed.

2A to 2C show the configuration of a conventional stem in cross section, plane and bottom, respectively. Referring to the figure, an exhaust pipe 12 for vacuum inside the cathode ray tube is formed at the center of the flange 11 of the stem. In addition, in order to apply a predetermined voltage to each electrode (not shown) of the electron gun 5 along the periphery of the flange 11, a plurality of stem pins 13 are spaced at predetermined intervals to form a stem pin circle. do. Meanwhile, a stem mount 15 is formed around each stem pin 13 in order to maintain strength and insulation characteristics of the metallic stem pins 13. The conventional stem 6 applies a predetermined voltage to each electrode of the electron gun 5 and the diameter Φ 1 of the internal stem pin circle formed by the inner stem pins 13a connected to each electrode of the electron gun 5. The outer stem pins 13b formed by the outer stem pins 13b connected to the sockets (not shown) have the same stem pins 13.

3 is a cross-sectional view showing a state in which a stem 6 of the related art is coupled to the neck portion 9 of the cathode ray tube described in FIG. 1. Referring to the drawings, the stem is sealed in the neck portion by introducing a stem into an end portion of the neck portion 9 and melting the part where the side surface of the flange 11 of the stem 6 contacts the inner surface of the neck portion.

Conventionally, when the diameter of a neck part differs, the stem which has a stem pin circle corresponding to it was needed. That is, the stem used for the neck portion having an outer diameter D of 22.5 mm could be coupled to the socket for 22.5 mm, and the stem used for the neck portion having an outer diameter D of 29.1 mm could be coupled only to the socket for 29.1 mm. However, since the chassis for 29.1 mm is mainly produced in the monitor market larger than 15 inches, this has a problem that it is not compatible with the mini-neck cathode ray tube having an outer diameter of 26.5 mm in the neck portion.

In addition, the electrode of the electron gun used for the small neck portion for lowering power consumption becomes smaller, so that the spherical aberration becomes large and the number of electrodes of the electron gun increases to prevent this. The number of stem pins increases in response to the increased number of electrodes, resulting in a withstand voltage problem. In order to solve this withstand voltage problem, when the inner diameter of the neck portion is increased and the diameter of the stem flange is increased to seal the end portion of the neck portion, it is difficult to reduce power consumption and seal the end portion of the neck portion because of increasing the inner diameter of the neck portion. Therefore, there is a problem in that a dedicated facility is required and productivity is lowered.

The neck portion 200 of the cathode ray tube for solving the above problems is disclosed in US Pat. No. 6,078,134.

Referring to FIG. 4, the neck portion 200 of the cathode ray tube is a stem mount 63 formed by convexly stacking the glass material integral with the stem 400 around the base portion of the stem gun 62 on the electron gun holding side. ), And the distance from the central axis A of the neck portion 200 to the inner wall of the region accommodating the main portion of the electron gun 61 of the neck portion is the first distance R1, the height in the tube axis direction of the stem mount 63 ( The distance from the center axis A of the neck portion to the outer side surface of the stem mount 63 measured at the position of the height of 1/2 of H) is the second axis R2, the center axis of the neck portion from the inner wall of the neck portion 200. In the case where the distance to (A) is defined as the third distance, at least in the neck portion region facing the stem mount 63, except for the vicinity of the melted portions of the stem 400 and the neck portion 200, The three distances are not smaller than the first distance R1, and the relationship between the first distance R1 and the second distance R2 satisfies 0 &lt; R1-R2 &lt; 2.1 mm.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide a cathode ray tube having a stem that is compatible even when the neck portions have different diameters.                         

In addition, an object of the present invention is to provide a method for manufacturing a cathode ray tube that is easy to work and has improved productivity by sealing the compatible stem with a neck portion using existing equipment.

The cathode ray tube of the present invention for achieving the above object is a panel formed with a fluorescent film on the inner surface; A funnel sealed to the panel and including a neck portion having an electron gun receiving region and a sealing region; A stem having a plurality of stem pins applied to each electrode of the electron gun and supported by a stem mount, respectively, wherein an inner diameter of a sealing area of the neck portion is larger than an inner diameter of the electron gun receiving region, The diameter of the inner stem pin circle according to the arrangement of the inner stem pins located therein is smaller than the diameter of the outer stem pin circle according to the arrangement of the outer stem pins located outside the neck, and at the middle of the height of the stem mount. The horizontal length to the inner surface of the sealing area of the neck portion is greater than or equal to 1.0 mm and less than or equal to 2.0 mm.

In addition, the outer diameter of the electron gun receiving region of the neck portion is characterized in that 22.5 ± 0.7mm.

And the method of manufacturing a cathode ray tube of the present invention for achieving the above object is a panel with a fluorescent film formed on the inner surface; A funnel sealed to the panel and including a neck portion having an electron gun receiving region and a sealing region; A method of manufacturing a cathode ray tube, the method comprising: a stem applying a voltage to each electrode of the electron gun, each having a plurality of stem pins supported by a stem mount, wherein the inner diameter of the sealing area of the neck portion is within the electron gun receiving area. A first step formed larger than the diameter; A second step in which the diameter of the inner stem pin circle according to the arrangement of the inner stem pins of the stem is smaller than the diameter of the outer stem pin circle according to the arrangement of the outer stem pins of the stem; A third step of introducing the stem into the sealing region of the neck portion such that a vertical distance from an end of the sealing region of the neck portion to a lower surface of the flange of the stem is greater than or equal to 0.3 mm and less than or equal to 1.5 mm; A fourth step of pulling the stem in the direction of the outer stem pin to seal the sealing area with the neck portion so that a horizontal length between the stem mount and the inner surface of the neck portion is greater than or equal to 1.0 mm and less than or equal to 2.0 mm; and Characterized in that.

In the first step, the sealing area of the neck portion is characterized in that the flare shape is opened at a predetermined angle from the electron gun receiving region of the neck portion.

Hereinafter, a cathode ray tube according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

5A to 5C are cross-sectional views, a plan view, and a bottom view showing the configuration of a stem of a cathode ray tube according to an embodiment of the present invention, respectively.

Referring to the drawings, the stem 30 includes a flange 31, an exhaust pipe 32 formed at the center of the flange 31, a plurality of stem pins 33, and a stem mount for supporting the stem pins. (34). The exhaust pipe 32 is formed for the vacuum inside the cathode ray tube. In addition, the stem pin 33 is connected to each electrode of the electron gun (not shown) is located inside the neck portion and is spaced apart from each other by a predetermined distance along the periphery of the flange 31 of a predetermined diameter (Φ ₁ ) A plurality of inner stem pins 33a forming an inner stem pin circle, and an intermediate part embedded in the flange 31 and the inner stem pins 33a are bent outwardly and connected to outer stem pins 33b to be described later. A diameter of the internal stem pin circle that is connected to a socket 33c for applying a predetermined voltage to each electrode of an electron gun (not shown), and the other end is connected to the intermediate portion 33c. It consists of a plurality of outer stem pins 33b which form an outer stem pin circle of diameter Φ2 larger than φ1. The diameter Φ 2 of the outer stem pin circle is preferably nominal 15.24 mm in order to be compatible with the chassis for 29.1 mm. In addition, the diameter of the inner stem pin circle (Φ1) is preferably set to 13.5mm to be sealed to the mini neck portion of 22.5mm. This is to prevent the breakdown voltage and the crack of the stem pin by securing a predetermined distance between the stem pin and the distance between the stem pin and the inner surface of the neck portion.

Meanwhile, in order to increase insulation and support the inner stem pins 33a, an integral stem mount 34 is formed along the periphery of the flange 31. The diameter of the circle Φ4 formed by the stem mount 34 along the periphery of the flange is such that the distance from the inner diameter D2 of the sealing area of the neck portion to be described later is 1 mm or more for easy workability during sealing. It is preferable to set it as 16.4 mm. In addition, the diameter 31 of the flange 31 is 20.3mm, and the side surface of the flange is preferably formed to be inclined in the same direction as the inclination of the sealing area 41 of the neck portion to be described later to facilitate work during sealing. .                     

6A illustrates a cross section of a neck portion of a cathode ray tube according to an embodiment of the present invention before the stem of FIG. 5A is coupled to a neck portion of the cathode ray tube.

Referring to the drawing, the neck portion 39 includes an electron gun receiving region 40 in which most of the electron gun is accommodated, and a sealing region in which the inner stem pins 33a and the stem mount 34 are accommodated and the stem is sealed ( 41).

The outer diameter D3 of the electron gun receiving region of the neck portion is preferably 22.5 ± 0.7 mm.

The sealing portion 41 of the neck portion has a flare shape which is opened at a predetermined angle from the electron gun receiving region 40 of the neck portion so that the inner diameter D2 of the sealing region of the neck portion is larger than the inner diameter D1 of the electron gun receiving region. do. Preferably, the opening angle α is set to 20 ° so that the vertical length h1 in the direction of the tube axis B of the sealing area of the neck portion is 8 mm. This is to allow the difference between the diameter Φ 4 of the stem mount circle and the inner diameter D2 of the sealing area of the neck portion to be 1 mm or more after sealing the stem 30 to the neck portion 39.

6C is a cross-sectional view illustrating a state in which the stem of FIG. 5A is sealed to the neck portion of the cathode ray tube.

Referring to the drawings, the portion where the flange 31 and the end portion of the sealing area 41 of the neck contact is melted and sealed. After sealing the sealing region 41 and the stem 30 of the neck portion, the horizontal length d from the middle portion h2 of the height of the stem mount 34 to the inner surface 41a of the sealing region of the neck portion is It is desirable to seal to be greater than or equal to 1.0 mm and less than or equal to 2.0 mm. This is because a proper distance, such as the horizontal distance d, must be present between the stem mount 34 on the flange 31 of the stem and the inner surface 41a of the sealing area of the neck portion. This is because this is prevented and the withstand voltage is improved during pneumatic treatment.

On the other hand, the resistor 43 is provided along the electrode 42 of the electron gun. The resistor 43 drops the voltage applied through the internal conductive film formed on the funnel 4 and applies it to the electrode 42 of the electron gun. And the stem pin 33 is made of at least nine. One of the stem pins is grounded by being connected to the resistor 43.

Referring to the method of sealing the stem in the sealing area of the neck portion of the cathode ray tube as follows.

First, the inner diameter D2 of the sealing region of the neck portion is formed larger than the inner diameter D1 of the electron gun receiving region (first step). The sealing portion 41 of the neck portion is formed in a flare shape that is opened at a predetermined angle from the electron gun receiving region 40 of the neck portion. The diameter of the inner stem pin circle according to the arrangement of the inner stem pins 33a of the stem is smaller than the diameter of the outer stem pin circle according to the arrangement of the outer stem pins 33b of the stem. (Step 2). FIG. 6B is a cross-sectional view showing a state where the stem and the neck portion are positioned before the stem of FIG. 5A is sealed to be coupled to the neck portion of the cathode ray tube. Referring to the drawings, the neck portion is sealed so that the vertical distance h3 from the end portion 41b of the sealing region of the neck portion to the lower surface 31b of the flange of the stem is greater than or equal to 0.3 mm and less than or equal to 1.5 mm. The stem 30 is retracted and positioned in the area 41 (third step). When the sealing area 41 of the neck portion is melted and sealed, the stem 30 is pulled in the direction of the outer stem pin 33b to reduce the thickness k of the sealing area 41 of the neck portion, thereby reducing the sealing. The horizontal length d between the mound 34 and the inner surface 41a of the sealing area of the neck portion is greater than or equal to 1.0 mm and less than or equal to 2.0 mm (fourth step).

As described above, the cathode ray tube according to the present invention has an advantage that it can be compatible with the cathode ray tube having a different diameter of the neck by forming an outer stem pin circle having a diameter larger than that of the inner stem pin circle.

In addition, since the inner diameter of the sealing area of the neck portion is larger than the inner diameter of the electron gun receiving area, the stem is sealed on the inner surface of the neck portion, thereby eliminating the need for a dedicated facility required for sealing at the end of the neck portion, thereby improving productivity.

In addition, since the stem is sealed in the sealing area of the neck portion, there is no glass debris or foreign matter, which is advantageous in the withstand voltage.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (5)

A panel having a fluorescent film formed on an inner surface thereof; A funnel sealed to the panel and including a neck portion having an electron gun receiving region and a sealing region; And applying a voltage to each electrode of the electron gun, each stem having a plurality of stem pins supported by a stem mount. An array of outer stem pins whose inner diameter of the sealing region of the neck portion is larger than the inner diameter of the electron gun receiving region, and the diameter of the inner stem pin circles according to the arrangement of the inner stem pins positioned inside the neck portion, are located outside the neck portion. Cathode ray tube, characterized in that less than the diameter of the outer stem pin circle, the horizontal length from the middle of the height of the stem mount to the inner surface of the sealing area of the neck portion is greater than or equal to 1.0mm and less than or equal to 2.0mm . The method of claim 1, An outer diameter of the electron gun receiving region of the neck portion is 22.5 ± 0.7mm. The method according to claim 1 or 2, The stem pin is made of at least nine, one of them is connected to a resistor applied to the electrode constituting the electron gun by dropping the voltage applied through the inner conductive film. A panel having a fluorescent film formed on an inner surface thereof; A funnel sealed to the panel and including a neck portion having an electron gun receiving region and a sealing region; In the method of manufacturing a cathode ray tube comprising a; applying a voltage to each electrode of the electron gun, each having a plurality of stem pins supported by a stem mount, A first step of forming an inner diameter of the sealing region of the neck portion larger than an inner diameter of the electron gun receiving region; A second step in which the diameter of the inner stem pin circle according to the arrangement of the inner stem pins of the stem is smaller than the diameter of the outer stem pin circle according to the arrangement of the outer stem pins of the stem;  A third step of introducing the stem into the sealing region of the neck portion such that a vertical distance from an end of the sealing region of the neck portion to a lower surface of the flange of the stem is greater than or equal to 0.3 mm and less than or equal to 1.5 mm; A fourth step of pulling the stem in the direction of the outer stem pin to seal the sealing area with the neck portion so that a horizontal length between the stem mount and the inner surface of the neck portion is greater than or equal to 1.0 mm and less than or equal to 2.0 mm; and Method for producing a cathode ray tube, characterized in that. The method of claim 4, wherein And the sealing region of the neck portion is flared open at a predetermined angle from the electron gun receiving region of the neck portion.

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