Inner shield for color cathode ray tube
View Patent ↗The invention relates to an inner shield for color cathode ray tube. The inner shield has two long side parts and two short side parts. Each of two long sides has an opening part which comprises an inclined part and an U-shape recessed edge. Otherwise, the opening part may comprise an vertical part and an U-shape recessed edge. Each of two short sides has a V-shaped opening. The inner shield of the invention is capable of surely shielding unintended external magnetic field.
1. An inner shield for color cathode ray tube, composed of two long side parts facing each other and two short side parts facing each other, which form a small opening part at an electron gun's side and a large opening part at a panel's side, comprising:
a plurality of first recessed parts recessed for a given depth at one or more slopes from each of diagonal points of said long side parts at a small opening part's side towards a large opening part's side of said long side parts; and
a plurality of second recessed parts recessed for a given depth in a round shape in connection with said first recessed parts,
wherein said slopes are corresponding to the ratio of a length of said first recessed parts in the direction of center axis of said long side parts to a length of said first recessed parts at the right angle to center axis of said long side parts, and
wherein an absolute value of said slopes become smaller as said first recessed parts become far from said small opening part's side of said long side parts and close to said large opening part's side of said long side parts.
2. An inner shield for color cathode ray tube, composed of two long side parts facing each other and two short side parts facing each other, which form a small opening part at a electron gun's side and a large opening part at a panel's side, comprising:
a plurality of first recessed parts recessed for a given depth at one or more slopes from each of diagonal points of said long side parts at a small opening part's side towards a large opening part's side of said long side parts; and
a plurality of second recessed parts recessed for a given depth in a round shape in connection with said first recessed parts,
wherein said slopes are corresponding to the ratio of a length of said first recessed parts in the direction of center axis of said long side parts to a length of said first recessed parts at the right angle to center axis of said long side parts, and
wherein each of said first recessed parts comprises a first inclined part with a first slope and a second inclined part with a second slope, an absolute value of said second slope is smaller than that of said first slope.
3. The inner shield according to claim 2 , wherein said first slope of said first inclined part has an infinite value.
4. The inner shield according to claim 1 , wherein said second recessed parts are in a U-shape.
5. The inner shield according to claim 1 , comprising:
a plurality of third recessed parts recessed for a given depth at a third slope from each of diagonal points of said short side parts at said small opening part's side towards said large opening part's side of said short side parts, wherein said third slope is the ratio of a length of said third recessed part in the direction of center axis of said short side parts to a length of said third recessed part at the right angle to center axis of said short side parts; and
a plurality of fourth recessed parts recessed at a fourth slope of 0 in connection with said third recessed parts,
wherein said third and fourth slopes are ratios of a length of said third and fourth recessed parts in the direction of center axis of said short side parts to a length of said third and fourth recessed parts at the right angle to center axis of said short side parts.
6. The inner shield according to claim 5 , wherein said third slope of said third recessed parts has an infinite value.
7. The inner shield according to claim 2 , comprising:
a plurality of third recessed parts recessed for a given depth at a third slope from each of diagonal points of said short side parts at said small opening part's side towards said large opening part's side of said short side parts, wherein said third slope is the ratio of a length of said third recessed part in the direction of center axis of said short side parts to a length of said third recessed part at the right angle to center axis of said short side parts; and
a plurality of fourth recessed parts recessed at a fourth slope of 0 in connection with said third recessed parts,
wherein said third and fourth slopes are ratios of a length of said third and fourth recessed parts in the direction of center axis of said short side parts to a length of said third and fourth recessed parts at the right angle to center axis of said short side parts.
8. The inner shield according to claim 7 , wherein said third slope of said third recessed parts has an infinite value.
9. The inner shield according to claim 3 , comprising:
a plurality of third recessed parts recessed for a given depth at a third slope from each of diagonal points of said short side parts at said small opening part's side towards said large opening part's side of said short side parts, wherein said third slope is the ratio of a length of said third recessed part in the direction of center axis of said short side parts to a length of said third recessed part at the right angle to center axis of said short side parts; and
a plurality of fourth recessed parts recessed at a fourth slope of 0 in connection with said third recessed parts,
wherein said third and fourth slopes are ratios of a length of said third and fourth recessed parts in the direction of center axis of said short side parts to a length of said third and fourth recessed parts at the right angle to center axis of said short side parts.
10. The inner shield according to claim 9 , wherein said third slope of said third recessed parts has an infinite value.
11. The inner shield according to claim 4 , comprising:
a plurality of third recessed parts recessed for a given depth at a third slope from each of diagonal points of said short side parts at said small opening part's side towards said large opening part's side of said short side parts, wherein said third slope is the ratio of a length of said third recessed part in the direction of center axis of said short side parts to a length of said third recessed part at the right angle to center axis of said short side parts; and
a plurality of fourth recessed parts recessed at a fourth slope of 0 in connection with said third recessed parts,
wherein said third and fourth slopes are ratios of a length of said third and fourth recessed parts in the direction of center axis of said short side parts to a length of said third and fourth recessed parts at the right angle to center axis of said short side parts.
12. The inner shield according to claim 11 , wherein said third slope of said third recessed parts has an infinite value.
13. The inner shield according to claim 1 , comprising said third recessed parts recessed in a V-shape from each of diagonal points of said short side parts at said small opening part's side towards said short side part's large opening part's side.
14. The inner shield according to claim 13 , wherein each of pointed parts of said third recessed parts at said large opening part's side has a given curvature.
15. The inner shield according to claim 2 , comprising said third recessed parts recessed in a V-shape from each of diagonal points of said short side parts at said small opening part's side towards said short side part's large opening part's side.
16. The inner shield according to claim 15 , wherein each of pointed parts of said third recessed parts at said large opening part's side has a given curvature.
17. The inner shield according to claim 3 , comprising said third recessed parts recessed in a V-shape from each of diagonal points of said short side parts at said small opening part's side towards said short side part's large opening part's side.
18. The inner shield according to claim 17 , wherein each of pointed parts of said third recessed parts at said large opening part's side has a given curvature.
19. The inner shield according to claim 4 , comprising said third recessed parts recessed in a V-shape from each of diagonal points of said short side parts at said small opening part's side towards said short side part's large opening part's side.
20. The inner shield according to claim 19 , wherein each of pointed parts of said third recessed parts at said large opening part's side has a given curvature.
21. The inner shield according to claim 2 , wherein said second recessed parts are in a U-shape.
22. The inner shield according to claim 21 , comprising:
a plurality of third recessed parts recessed for a given depth at a third slope from each of diagonal points of said short side parts at said small opening part's side towards said large opening part's side of said short side parts, wherein said third slope is the ratio of a length of said third recessed part in the direction of center axis of said short side parts to a length of said third recessed part at the right angle to center axis of said short side parts; and
a plurality of fourth recessed parts recessed at a fourth slope of 0 in connection with said third recessed parts,
wherein said third and fourth slopes are ratios of a length of said third and fourth recessed parts in the direction of center axis of said short side parts to a length of said third and fourth recessed parts at the right angle to center axis of said short side parts.
23. The inner shield according to claim 22 , wherein said third slope of said third recessed parts has an infinite value.
24. The inner shield according to claim 21 , comprising said third recessed parts recessed in a V-shape from each of diagonal points of said short side parts at said small opening part's side towards said short side part's large opening part's side.
25. The inner shield according to claim 24 , wherein each of pointed parts of said third recessed parts at said large opening part's side has a given curvature.