Glass funnel for cathode-ray tube 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, within a range excluding corners, has a first region of predetermined dimension, the predetermined dimension 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.
Claims14
A glass funnel for a cathode-ray tube, having a shape of a funnel with a rectangular larger opening portion at one end and a smaller opening portion at the other end, said larger opening portion being composed of major sides across a minor axis, minor sides across a major axis, and corners on a diagonal axis, the corners continuing between said major sides and said minor sides, the glass funnel 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 for 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, within a range excluding said corners, has a first region of predetermined dimension measured from said seal edge surface in a direction parallel to a tube axis and a second region excluding said first portion;
- when constituting a cathode-ray tube, said first region falls on a region to undergo tensile vacuum stress resulting from a vacuum pressure in said cathode-ray tube;
- said second region has a thickness smaller than a thickness of said first region, so that a boundary portion between said first region and said second region forms a stepped portion on an external surface of said body portion.
A glass funnel for a cathode-ray tube, having a shape of a funnel with a rectangular larger opening portion at one end and a smaller opening portion at the other end, said larger opening portion being composed of major sides across a minor axis, minor sides across a major axis, and corners on a diagonal axis, corners continuing between said major sides and said minor sides, the glass funnel 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 for 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 first region of predetermined dimension measured from said seal edge surface in a direction parallel to a tube axis and a second portion excluding said first portion;
- when constituting a cathode-ray tube, said first region falls on a region to undergo tensile vacuum stress resulting from a vacuum pressure in said cathode-ray tube;
- said second region has a thickness smaller than a thickness of said first region, so that a boundary portion between said first region and said second region forms a stepped portion on an external surface of said body portion;
- and
- a maximum step ΔTLmax of said stepped portion on said major side and a maximum step ΔTSmax of said stepped portion on said minor side have a relationship that ΔTSmax≦ΔTLmax.
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 rectangular larger opening portion a one end and a smaller opening portion at the other end, said larger opening portion being composed of major sides across a minor axis, minor sides across a major axis, and corners on a diagonal axis, the corners continuing between said major sides and said minor sides, the glass funnel 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 for 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, within a range excluding said corners, has a first region of predetermined dimension measured from said seal edge surface in a direction parallel to a tube axis and a second region excluding said first portion;
- when constituting a cathode-ray tube, said first region falls on a region to undergo tensile vacuum stress resulting from a vacuum pressure in said cathode-ray tube;
- said second region has a thickness smaller than a thickness of said first region, so that a boundary portion between said first region and said second region forms a stepped portion on an external surface of said body portion;
- 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.
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 for a cathode-ray tube, having a shape of a funnel with a rectangular larger opening portion at one end and a smaller opening portion at the other end, said larger opening portion being composed of major sides across a minor axis, minor sides across a major axis, and corners on a diagonal axis, corners continuing between said major sides and said minor sides, the glass funnel 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 for 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 first region of predetermined dimension measured from said seal edge surface in a direction parallel to a tube axis and a second portion excluding said first portion;
- when constituting a cathode-ray tube, said first region falls on a region to undergo tensile vacuum stress resulting from a vacuum pressure in said cathode-ray tube;
- said second region has a thickness smaller than a thickness of said first region, so that a boundary portion between said first region and said second region forms a stepped portion on an external surface of said body portion;
- and
- a maximum step ΔTLmax of said stepped portion on said major side and a maximum step ΔTSmax of said stepped portion on said minor side have a relationship that ΔTSmax≦ΔTLmax;
- 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 a rejoined to each other.
Dependencies are inferred from the claim text.