Bulb for color cathode ray tube and color cathode ray tube and methods for production thereof | Patent Publication Number 20030214213
US 20030214213 A1Publication DateNov 20, 2003
Original Assignee
Current Assignee
Inventor/ApplicantsMasanao Uesugi
Seiichi Tsunoda
Seiichi Tsunoda
International
2
H01J
G03F
National
5
313/364.
313/461.
430/240.
313/477.00R
430/230.
Field of Search
0
- 1. A method for producing a bulb for a color cathode ray tube, said bulb comprising a face plate and a color selection member having a plurality of opening portions, and satisfying the following expression (1), wherein X is a nominal diagonal inchage of the bulb and P (unit: mm) is a pitch of the opening portions along an electron beam sweep direction in the central portion of the bulb, nsaid method including the step of exposing a light sensitive film formed on an inner surface of the face plate on the basis of a transmitted-light strength distribution of superposed Fresnel diffraction waves of exposure lights which are emitted from a plurality of exposure light sources arranged in different positions along the electron beam sweep direction and pass through the opening portions formed in the color selection member, to form exposed regions in the light sensitive film which regions correspond to the opening portions, in which a transmitted-light strength of superposed Fresnel diffraction waves of the two exposure lights, out of a plurality of the exposure lights, which are emitted from the two exposure light sources contributing to the exposure of edge portions of the light sensitive film corresponding to each opening portion satisfies the following requirements (A) and (B); (A) in an area of the transmitted-light strength in which area the transmitted-light strength on the light sensitive film decreases along the electron beam sweep direction from a central portion of the exposed region of the light sensitive film corresponding to each opening portion, the derivative of the first order of the transmitted-light strength has at least one upward-convex area, and (B) the edge portions of the exposed light sensitive film corresponding to each opening portion are included in an area of the transmitted-light strength which area corresponds to the upward-convex area which appears first along the electron beam sweep direction from the central portion of the exposed region corresponding to each opening portion, out of the upward-convex areas of the derivative of the first order of the transmitted-light strength. 0.0117X0.0457
- 5. The method for producing a bulb for a color cathode ray tube according to any one of claims 1 to 4, in which the number of the exposure light sources is 2.
- 6. The method for producing a bulb for a color cathode ray tube according to any one of claims 1 to 4, in which the number of the exposure light sources is 3 or more, and the transmitted-light strength of superposed Fresnel diffraction waves of the exposure lights from all of the exposure light sources satisfies ICENTER/IEDGE1.2, wherein ICENTER is a transmitted-light strength in the central portion of the exposed region corresponding to each opening portion and IEDGE is a transmitted-light strength in the edge portion of the light sensitive film corresponding to each opening portion.
- 7. A method for producing a color cathode ray tube constituted of a bulb for a color cathode ray tube, said bulb comprising a face plate and a color selection member having a plurality of opening portions, and said bulb satisfying the following expression (1), wherein X is a nominal diagonal inchage of the bulb and P (unit: mm) is a pitch of the opening portions along an electron beam sweep direction in the central portion of the bulb, nsaid method including the step of exposing a light sensitive film formed on an inner surface of the face plate on the basis of a transmitted-light strength distribution of superposed Fresnel diffraction waves of exposure lights which are emitted from a plurality of exposure light sources arranged in different positions along the electron beam sweep direction and pass through the opening portions formed in the color selection member, to form exposed regions in the light sensitive film which regions correspond to the opening portions, in which a transmitted-light strength of superposed Fresnel diffraction waves of the two exposure lights, out of a plurality of the exposure lights, which are emitted from the two exposure light sources contributing to the exposure of edge portions of the light sensitive film corresponding to each opening portion satisfies the following requirements (A) and (B); (A) in an area of the transmitted-light strength in which area the transmitted-light strength on the light sensitive film decreases along the electron beam sweep direction from a central portion of the exposed region of the light sensitive film corresponding to each opening portion, the derivative of the first order of the transmitted-light strength has at least one upward-convex area, and (B) the edge portions of the exposed light sensitive film corresponding to each opening portion are included in an area of the transmitted-light strength which area corresponds to the upward-convex area which appears first along the electron beam sweep direction from the central portion of the exposed region corresponding to each opening portion, out of the upward-convex areas of the derivative of the first order of the transmitted-light strength. 0.0117X0.0457
- 11. A bulb for a color cathode ray tube comprising a face plate and a color selection member having a plurality of opening portions, said bulb satisfying the following expressions (1) and (2), wherein X is a nominal diagonal inchage of the bulb, P (unit: mm) is a pitch of the opening portions along an electron beam sweep direction in the central portion of the bulb, GH (unit: mm) is a distance between an inner surface of the face plate and the color selection member in the central portion of the bulb, and LT is a value obtained by dividing a size (unit: mm) of the opening portion along the electron beam sweep direction in the central portion of the bulb by the pitch P (unit: mm).
- 12. A color cathode ray tube constituted of a bulb for a cathode ray tube, said bulb comprising a face plate and a color selection member having a plurality of opening portions, and said bulb satisfying the following expressions (1) and (2), wherein X is a nominal diagonal inchage of the bulb, P (unit: mm) is a pitch of the opening portions along an electron beam sweep direction in the central portion of the bulb, GH (unit: mm) is a distance between an inner surface of the face plate and the color selection member in the central portion of the bulb, and LT is a value obtained by dividing a size (unit: mm) of the opening portion along the electron beam sweep direction in the central portion of the bulb by the pitch P (unit: mm).
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