Glass funnel and glass bulb for cathode ray tube
AssigneeNippon Electric Glass Co., Ltd.
InventorsMasaya Kyono, Hiroshi Kakigi
Life of this patent
Estimating the term…
Abstract
A body portion of the funnel has a first region of dimension h, the dimension h being measured from the seal edge surface in a direction parallel to a tube axis, and a second region excluding the first region. The second region has a thickness relatively smaller than the thickness of the first region, so that a boundary portion between the two regions forms a stepped portion on the external surface of the body portion.
Claims12
A glass funnel for a cathode-ray tube, having a shape of a funnel with a larger opening portion at one end and a smaller opening portion at the other end, comprising a seal edge portion extending from a seal edge surface of said larger opening portion to a mold match line, a yoke portion to be equipped with a deflection yoke, said yoke portion being arranged at a side of said smaller opening portion, and a body portion continuing between said mold match line and said yoke portion, wherein:
- said seal edge surface has a thickness almost equal to a thickness of a seal edge surface of a glass panel for a cathode-ray tube to be joined thereto;
- said body portion has a region of dimension h measured from said seal edge surface in a direction parallel to a tube axis and the other region excluding said region of dimension h;
- when constituting a cathode-ray tube, said region of dimension h falls on a region to undergo tensile vacuum stress resulting from a vacuum pressure in said cathode-ray tube;
- said other region has a thickness smaller than a thickness of said region of dimension h, so that a boundary portion between said region of dimension h and said other region forms a stepped portion on an external surface of said body portion;
- said stepped portion has a step ΔT of 0.06≦ΔT/S≦0.3 with respect to a thickness S of said seal edge surface.
A glass bulb for a cathode-ray tube comprising:
- a glass panel for a cathode-ray tube including a face portion having a substantially flat external surface, a skirt portion extending from the periphery of said face portion, and a seal edge surface arranged on an end surface of said skirt portion;
- a glass funnel, having a shape of a funnel with a larger opening portion at one end and a smaller opening portion at the other end, comprising a seal edge portion extending from a seal edge surface of said larger opening portion to a mold match line, a yoke portion to be equipped with a deflection yoke, said yoke portion being arranged at a side of said smaller opening portion, and a body portion continuing between said mold match line and said yoke portion, wherein:
- said seal edge surface has a thickness almost equal to a thickness of a seal edge surface of a glass panel for a cathode-ray tube to be joined thereto;
- said body portion has a region of dimension h measured from said seal edge surface in a direction parallel to a tube axis and the other region excluding said region of dimension h;
- when constituting a cathode-ray tube, said region of dimension h falls on a region to undergo tensile vacuum stress resulting from a vacuum pressure in said cathode-ray tube;
- said other region has a thickness smaller than a thickness of said region of dimension h, so that a boundary portion between said region of dimension h and said other region forms a stepped portion on an external surface of said body portion;
- said stepped portion has a step ΔT of 0.06≦ΔT/S≦0.3 with respect to a thickness S of said seal edge surface;
- and
- a neck portion to be equipped with an electron gun, said neck portion being joined to said smaller opening portion of the glass funnel for a cathode-ray tube,
- wherein said seal edge surface of said glass panel for a cathode-ray tube and said seal edge surface of the glass funnel for a cathode-ray tube are joined to each other.
Dependencies are inferred from the claim text.