CATHODE RAY TUBE WITH IMPROVED MASK ASSEMBLY

• US 20090072699A1
• Filed: 05/15/2008
• Published: 03/19/2009
• Est. Priority Date: 09/13/2007
• Status: Abandoned Application

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Youn, Hae-Su, Suk, Bong-Kyung, Pyun, Do-Hun, Lee, Won-Bok, Lim, Jong-Hoon, Ha, Kuen-Dong
• Application Number:
  US12/121,707
• Publication Number:
  US 20090072699A1
• Time in Patent Office: Days
• US Class Current: 313/402
• CPC Class Codes: H01J 2229/0788 Parameterised dimensions of aperture plate, e.g. relationships, polynomial expressions
• CPC Class Codes: H01J 29/076 characterised by the shape or distribution of beam-passing apertures

Abstract

A cathode ray tube including a shadow mask. The shadow mask includes an aperture portion including a plurality of beam guide holes, a non-aperture portion surrounding the aperture portion, and a skirt portion that is bent from an edge of the non-aperture portion toward an electron gun. The non-aperture portion includes a pair of longer sides, a pair of shorter sides, and four corner portions, and a first width of the non-aperture portion measured at the longer side and a second width of the non-aperture portion measured at the shorter side are formed to be less than a third width of the non-aperture portion measured at the corner portions. The shadow mask satisfies the following conditions: 2 mm≦w1<w3, and 2 mm≦w2<w3, where w1 denotes the first width of the non-aperture portion, w2 denotes the second width of the non-aperture portion, and w3 denotes the third width of the non-aperture portion.

Claims

1. A cathode ray tube comprising:

a vacuum tube comprising a panel in which a fluorescence screen is formed, a funnel that is provided to a rear part of the panel, and a neck;

an electron gun positioned inside the neck;

a deflection yoke positioned outside the funnel; and

a shadow mask positioned inside the panel with a predetermined distance to the fluorescence screen and having an aperture portion including a plurality of beam guide holes, a non-aperture portion surrounding the aperture portion, and a skirt portion bent from an edge of the non-aperture portion toward the electron gun,

wherein the non-aperture portion includes a pair of longer sides, a pair of shorter sides, and four corner portions, and a first width of the non-aperture portion measured at the longer side and a second width of the non-aperture portion measured at the shorter side are formed to be less than a third width of the non-aperture portion measured at one of the corner portions,

wherein the shadow mask satisfies the following conditions;

2 mm≦

w1<

w3, and 2 mm≦

w2<

w3, where w1 denotes the first width of the non-aperture portion, w2 denotes the second width of the non-aperture portion, and w3 denotes the third width of the non-aperture portion.

2. The cathode ray tube of claim 1, wherein the cathode ray tube has an over-scan area that is greater than an area of the aperture portion of the shadow mask.

3. The cathode ray tube of claim 2, wherein the first width of the non-aperture portion is formed to be less than a distance between an edge of the over-scan area measured at the longer side, and the aperture portion.

4. The cathode ray tube of claim 2, wherein the second width of the non-aperture portion is formed to be less than a distance between an edge of the over-scan area measured at the shorter side, and the aperture portion.

5. The cathode ray tube of claim 2, wherein the third width of the non-aperture portion is formed to be greater than a distance between an edge of the over-scan area measured at the corner portion, and the aperture portion.

6. The cathode ray tube of claim 2, wherein the over-scan area is 1.08 times the area of the aperture portion.

7. The cathode ray tube of claim 1, wherein the shadow mask includes a cutout portion in the skirt portion to partially reduce a width of the skirt portion.

8. The cathode ray tube of claim 1, further comprising a mask frame for supporting the shadow mask, wherein the mask frame is formed along an outer line of the skirt portion to correspond to the skirt portion.