KR100301196B1 - Structure of color cathode ray tube panel - Google Patents

Abstract

PURPOSE: A structure of a color cathode ray tube panel is provided to prevent an error due to mis-convergence by using a flat panel glass having a thickness of a center portion of an inner face different from the thickness of a peripheral portion of the inner face. CONSTITUTION: A shadow mask(104) is supported by a rail(105). A multitude of crossed electron beam is landed on a fluorescent screen(103). A color cathode ray tube panel has an inner face and a flat panel glass. The fluorescent screen(103) is formed on the inner face of the color cathode ray tube. A mask support body is adhered to the inner face of the color cathode ray tube. The flat panel glass has a flat outer face and an inner face. In the flat panel glass, the thickness of a center portion of the inner face is different from the thickness of a peripheral portion of the inner face.

Description

Panel structure of color cathode ray tube

1 is a block diagram of a conventional flat mask (FIM) CRT.

2 is a state diagram of a conventional cathode ray tube.

3 is a conventional cathode ray tube,

(a) is a central state diagram.

(b) is a peripheral state diagram.

4 is a partial fastening of the conventional cathode ray tube.

FIG. 5 is a diagram showing a fluorescent dot dot pitch state. FIG.

6 is a state diagram of the cathode ray tube of the present invention.

7 is a cathode ray tube of the present invention,

(a) is a central state diagram.

(b) is a state diagram state.

8 is a partial fastening of the cathode ray tube of the present invention.

* Explanation of symbols for main parts of the drawings

101 panel glass 102 funnel glass

103: phosphor screen 104: shadow mask

105: rail 108: electron beam

The present invention relates to a panel structure of a color cathode ray tube. In particular, the outer surface of the panel glass is flattened and the inner surface is spherical as it moves from the center portion to the periphery portion by a miss convergence value. will be.

In the conventional cathode ray tube, as shown in FIGS. 1 to 4, the nipple type funnel 2 mounted inside the panel 1 having an outer surface and an inner surface thereof is planarized, and red (R) and rust (G) surfaces on the inner wall of the panel 1. ), Neck (9) provided with a phosphor screen (3) on the phosphor side of blue (B) color, and equipped with an inline electron gun (6) corresponding to the phosphor screen (3), and the phosphor screen (3). Neck (9) provided with an inline electron gun (6) corresponding thereto, a flat shadow mask (4) supported by a rail (5) at a position proximate to said phosphor screen (3), and in said electron gun (6) The emitted electron beam 8 is deflected by the deflector 7 and configured to reproduce the color image via the planar shadow mask 4.

In the state configured as described above, the electron beam 8 emitted from the electron gun 6 proceeds with R and B having the same angle θ at the center of G, starting from the reference line of the deflector 7 as shown in the second diagram. Light is emitted by landing on the red, green, and blue phosphor layers formed on the phosphor screen 3 by crossing each other in the holes of the planar shadow mask 4 spaced apart from the phosphor screen 3 by a predetermined distance Q.

The electron beam 8 landing on the central part and the main part of the phosphor screen 3 is designed such that the distance of the blue and green phosphors emitted as a third degree, that is, the D of the main part and the distance D 'of the main part separated by the distance l is as follows. do.

D = D '

However, even when the glass of the panel 1 is flattened and the performance of the deflector 7 is improved, a convergence defect occurs as a result of the distance D 'of the blue and green phosphors around the phosphor screen 3 becoming larger than the center D. There was a problem that the color cathode ray tube cannot be used completely.

In view of the above, the present invention has an object to prevent the misconvergence defect occurring in the color cathode ray tube by making the inner surface of the panel glass whose outer surface is planar different from the thickness of the central portion and the peripheral portion.

The present invention will be explained with reference to FIGS. 5 to 7.

In the phosphor screen 103 on which the electron beam 108 intersected by the shadow mask 104 supported by the rail 105 lands, the inner surface of the panel glass 101 whose outer surface is planar is different from the center and the thickness of the peripheral portion. It was provided by making spherical.

Then, the inner surface of the glass panel 101 has been provided by a spherical screen using an expression of _{D 1 '= D 1 1 +} cos7 ° (ℓ × 0.01).

In the figure, reference numeral 102 denotes a funnel.

In the above formula, D ₁ ′ is the panel glass thickness at the periphery, D ₁ is the panel glass thickness at the center, and ℓ represents the distance between D ₁ and D ₁ ′.

In the present invention configured as described above, the thickness D ₁ ′ of the periphery of the panel glass 101 appears as a result calculated using a misconvergence value generated in the conventional cathode ray tube.

For example, as shown in FIG. 5, when the misconvergence value of the cathode ray tube is 15, the value of the peripheral thickness D ₁ ′ of the glass of the panel 101 is obtained as follows.

(For colored cathode ray tubes with panel glass thickness (D ₁ ) = 15 mm, dot pitch (Pv) = 0.25 mm, Ph = 0.433 mm θ 1 = 38 °)

b = Ph / 3 = 0.433 / 3 = 0.1443 mm

a = b / 2 = 0.1443 / 2 = 0.0722 mm

Miss Convergence Value = 15 × 0.0722 = 1.083mm

That is, the distance D ₁ of the green and green phosphors on the main surface of the phosphor screen 103 is 1.083 mm larger than the distance D of the center portion.

The glass thickness D ₁ ′ of the panel 101 of the periphery is calculated so that the distance D ′ of the blue and green phosphors around the phosphor screen 103 is equal to the distance D of the central portion.

D ₁ '= X + D ₁

tan 52 = X / 1.083

X = tan 52 × 1.083 = 1.153 mm

D ₁ '= 1.153 + 15 = 16.153 mm

(Unit: mm)

The panel glass 101 spherical by this value can prevent misconvergence defects caused by the distance between the electron beams 108 incident on the phosphor screen 103.

As described above, the present invention is an invention capable of eliminating misconvergence defects by making the inner surface of the panel glass flattened on the outer surface.

Claims (2)

In a panel of a color cathode ray tube having a flat panel on which a phosphor screen is formed and a mask support is attached to the inner surface. The flat panel has no skirt portion, the outer surface is flattened, and the inner surface of the panel structure of a color cathode ray tube, characterized in that the thickness of the central portion and the peripheral portion are different. Wherein a peripheral thickness of the plate-like panel D ₁ 'referred to, and a central portion thickness of the plate-like panel as D _1, D ₁ and D _1' to as ℓ a _{distance, D 1 '= D 1 +} cos7 ° ( A panel structure of a color cathode ray tube, characterized by satisfying the expression