Color selection apparatus for cathode ray tube

• US 20020105256A1
• Filed: 11/15/2001
• Published: 08/08/2002
• Est. Priority Date: 12/08/2000
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Kim, Dong Hwan, Park, Joon Suk
• Granted Patent: US 6,717,343 B2
• Time in Patent Office: Days
• US Class Current: 313/407
• CPC Class Codes: H01J 2229/0722 Frame
• CPC Class Codes: H01J 29/073 Mounting arrangements associated with shadow masks

Abstract

A color selection apparatus for a cathode ray tube, having a frame formed with a pair of supporting members arranged facing each other at a predetermined distance therebetween and a pair of elastic members coupled to the supporting members; and a mask formed with a plurality of slits for passing electron beams and fixed to the supporting members under tension. Each of the elastic members is formed with a pair of opposite parts facing each other in parallel at a predetermined distance therebetween, and a connection part perpendicularly arranged between the opposite parts. The opposite parts are preferably opposite each other in a direction where the electron beams advance (z-axis direction of the cathode ray tube). Alternatively, the opposite parts are opposite each other in a major direction of the mask (x-axis direction of the cathode ray tube).

Claims

1. A color selection apparatus for a cathode ray tube, comprising:

a frame formed with a pair of supporting members arranged facing each other with a predetermined distance therebetween and a pair of elastic members coupled to the supporting members; and

a mask formed with a plurality of slits for passing electron beams and fixed to the supporting members under tension,

wherein each of the elastic members is formed with a pair of opposite parts facing each other in parallel with a predetermined distance therebetween and a connection part perpendicularly arranged between the opposite parts.

2. The color selection apparatus of claim 1 wherein the elastic member includes a pair of opposite parts facing each other in a direction where electron beams advance, and wherein the connection part is perpendicularly arranged between the opposite parts.

3. The color selection apparatus of claim 2 wherein the elastic member has a vertical length (a), a horizontal length (b) and a thickness (t), and is formed to maintain a secondary moment of inertia M₂ at a level higher than 85% of secondary moment of inertia M₁, the M₁ being a secondary moment of inertia of an elastic member which is formed as a square hollow pipe having a vertical length (a), a horizontal length (b) and a thickness (t);

the M₁ and M₂ being represented by the following formula;

4. The color selection apparatus of claim 1 wherein the mask has a major direction and a minor direction;

and wherein the elastic member includes a pair of opposite parts facing each other in the major direction of the mask, and wherein the connection part is perpendicularly arranged between the opposite parts.

5. The color selection apparatus of claim 4 wherein the elastic member has a vertical length (a), a horizontal length (b) and a thickness (t), and is formed to maintain a secondary moment of inertia M₂ at a level higher than 85% of secondary moment of inertia M₁, the M₁ being a secondary moment of inertia of an elastic member which is formed as a square hollow pipe having a vertical length (a), a horizontal length (b) and a thickness (t);

the M₁ and M₂ being represented by the following formulas;

6. A cathode ray tube, comprising:

a face panel on which a phosphor screen is formed;

a neck portion in which an electron gun assembly is arranged, the electron gun emitting three electron beams toward the phosphor screen;

a funnel placed between the face panel and the neck portion;

a deflection yoke mounted at an outer periphery of the funnel for deflecting the electron beams emitted from the electron gun; and

a color selection apparatus fixedly installed inside the face panel for dividing the three electron beams onto a corresponding red R, green G, and blue B phosphor layers of the phosphor screen, the color selection apparatus comprising;

a frame formed with a pair of supporting members arranged facing each other with a predetermined distance therebetween and a pair of elastic members coupled to the supporting members; and

a mask formed with a plurality of slits for passing electron beams and fixed to the supporting members under tension;

wherein each of the elastic members is formed with a pair of opposite parts facing each other in parallel with a predetermined distance therebetween and a connection part perpendicularly arranged between the opposite parts.

7. The cathode ray tube of claim 6 wherein the elastic member includes a pair of opposite parts facing each other in a direction in which the electron beams advance, and wherein the connection part is perpendicularly arranged between the opposite parts.

8. The cathode ray tube of claim 7 wherein the elastic member has a vertical length (a), a horizontal length (b) and a thickness (t), and is formed to maintain a secondary moment of inertia M₂ at a level higher than 85% of secondary moment of inertia M₁, the M₁ being a secondary moment of inertia of an elastic member which is formed as a square hollow pipe having a vertical length (a), a horizontal length (b) and a thickness (t);

the M₁ and M₂ being represented by the following formulas;

9. The cathode ray tube of claim 6 wherein the mask has a major direction and a minor direction;

and wherein the elastic member includes a pair of opposite parts facing each other in a major direction of the mask, and wherein the connection part is perpendicularly arranged between the opposite parts.

10. The cathode ray tube of claim 9 wherein the elastic member has a vertical length (a), a horizontal length (b) and a thickness (t), and is formed to maintain a secondary moment of inertia M₂ at a level higher than 85% of a secondary moment of inertia M₁, the M₁ being a secondary moment of inertia of an elastic member which is formed as a square hollow pipe having a vertical length (a), a horizontal length (b) and a thickness (t);

the M₁ and M₂ being represented by the following formulas;