Samsung Sdi Co., Inc.

Wan Kim

Soon-chul Shin

Gwang-soo Kang

Soon-Cheol Shin

Chan-Yong Kim

Do-houn Pyun

Do-hun Pyun

Gi-young Song

Tae-il Yoon

Joon-Suk Park

Choong-lak Kim

Jeong-in Yoo

A cathode ray tube includes a panel having a substantially flat outer surface and an inner curved surface with a phosphor screen. The panel has a substantially rectangular effective screen portion with two long sides parallel to each other, two short sides parallel to each other and four rounded edges interconnecting each long side and the neighboring short side. The effective screen portion is structure such that a first line V1 interconnecting centers of the long sides, a second line H1 interconnecting centers of the short sides and a third line D1 interconnecting centers of the rounded edges opposite to each other meet at a point. The effective screen portion has a first thickness Tv at the centers of the long sides, a second thickness Th at the centers of the short sides, a third thickness Td at the centers of the edges and a fourth thickness Tc at the meeting point of the all three lines V1, H1 and D1. A shadow mask is disposed within the panel so that the shadow mask faces the inner curved surface of the panel. The shadow mask has a curvature corresponding to the inner curved surface of the panel. The ratio of the second thickness Th to the third thickness Td while subtracting the fourth thickness Tc from each thickness satisfies the following condition: 0.75(Th&#x2212;Tc)/Td&#x2212;Tc)&#x2266;0.85, and the ratio of the first thickness Tv to the thickness Td while subtracting the fourth thickness Tc from each thickness satisfies the following condition: 0.75&#x2266;(Tv&#x2212;Tc)/(Td&#x2212;Tc)&#x2266;0.85.

Cathode ray tube

A cathode ray tube with a panel that has a thickness of the central portion of an effective area of a screen surface that is TC, a thickness of a vertical edge that is TV, a thickness of a horizontal edge portion that is TH, and a thickness of an edge in a diagonal direction that is TD. The respective values of TC, TV, TH and TD satisfy the expression (TH&minus;TC)&plus;(TV&minus;TC)&plus;(TD&minus;TC)<TC/3, and the radius of curvature in the diagonal direction of the outer surface of the effective area is 1450 mm or more. Thus, by limiting the difference in thickness of the central portion and the peripheral portion of the effective screen area of the panel and the curvature radius of the inner and outer surfaces of the effective screen, the weight of the panel is reduced and an increase of an incident angle caused by flatness of the screen panel is prevented so that a convergence feature of an electron beam is improved. Also, emotional sense of flatness according to the flatness of the screen surface can be improved.

Panel of cathode ray tube

A tension mask assembly for a color cathode ray tube includes a tension mask including at least two divided portions, each having a plurality of strips separated a predetermined distance from each other for forming slots, and each having a plurality of bridges for connecting the strips and defining slots, and a frame including first and second support members for supporting both end portions of the divided portions so that tension is applied to the strips of the divided portions and at least one pair of elastic members for supporting the first and second support members.

Tension mask assembly for color CRT having at least two divided portions

There is provided a hook assembly attached to a shadow mask frame including a base and a spring with a hole in one end thereof and the other end attached to said base, wherein a middle portion of said base is arched such that the arched portion takes the shape of a tunnel.

Hook assembly for use in shadow mask frame assembly

A tensioned shadow mask for a cathode ray tube (CRT), including: a series of parallel strips separated by slits having a predetermined interval; a plurality of tie bars interconnecting adjacent strips to define a plurality of slits at predetermined intervals; and a plurality of dummy bridges disposed between adjacent tie bars, extending from one of the strips to the other but not interconnecting the adjacent strips, wherein a length of the dummy bridges is greater than a length of the tie bars in the longitudinal direction of the strips.

Tensioned shadow mask for cathode ray tube including tie bars having dummy bridges

A tensioned shadow mask for a color cathode ray tube (CRT) adopting the same. In the color CRT including a faceplate on an inner side, a phosphor screen, a tensioned mask, and frame assembly secured to the faceplate, a funnel connected to the faceplate, the funnel having a neck portion and a cone portion, an electron gun in the neck portion of the funnel, and a deflection yoke on the cone portion of the funnel, the tensioned mask including a series of parallel strips separated by slits at an interval, tie bars interconnecting adjacent strips and defining slits at intervals, and dummy bridges disposed between adjacent tie bars, the dummy bridges respectively extending from adjacent strips toward each other in respective slits but not interconnecting the adjacent strips.

Tensioned shadow mask and color cathode ray tube adopting the same

A flat type color cathode ray tube (CRT) includes a bulb consisting of a flat type panel where a fluorescent film on which inner surface a fluorescent pattern and black matrix are coated is formed, and a funnel extended from the panel, and a frame assembly having a flat type shadow mask installed adjacent to the panel in the bulb and having a plurality of strips for forming a plurality of slits and a tie bar for connecting neighboring strips, wherein a vertical pitch of the black matrix formed on the fluorescent film is less than or equal to a vertical pitch of the tie bar of the flat type shadow mask.

Growing community of inventors

Yongin, South Korea

Wan Kim