Glass bulb for a cathode-ray tube and a cathode-ray tube device
AssigneesMatsushita Electric Industrial Co., Ltd., Nippon Electric Glass Co., Ltd.
InventorsHiroshi Sakurai, Hiromi Wakasono, Masaya Kyono, Koji Kuwahara
Life of this patent
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Abstract
In a disclosed glass bulb for a cathode-ray tube (CRT), a funnel unit have a less depth than a conventional one. The glass bulb for the CRT includes a panel unit having a panel screen, a neck unit holding an electron gun, and a funnel unit having a funnel-like shape, and the panel unit and the neck unit are bridged by the funnel unit. In the glass bulb, the funnel unit is formed from a plurality of glass members and a maximum-to-minimum thickness ratio of each of the plurality of glass members is designed to be within a range suitable for producing the glass members using pressing.
Claims18
A glass bulb for a cathode-ray tube comprising:
- a panel unit having a panel screen;
- a neck unit holding an electron gun;
- and a funnel unit having a funnel-like shape, wherein the panel unit and the neck unit are bridged by the funnel unit, wherein
- the funnel unit is formed from a plurality of glass members, the plurality of glass members including at least a first glass member on a side of the panel unit and a second glass member on a side of the neck unit, and
- a maximum-to-minimum thickness ratio of each of the plurality of glass members is designed to be within a range suitable for producing the plurality of glass members using pressing, the maximum-to-minimum thickness ratio being a ratio of thickness of a thickest portion to thickness of a thinnest portion.
A glass bulb for a cathode-ray tube comprising:
- a panel unit having a panel screen;
- a neck unit holding an electron gun;
- and a funnel unit having a funnel-like shape, wherein the panel unit and the neck unit are bridged by the funnel unit, wherein
- physically strengthened glass is used in at least part of the funnel unit.
A manufacturing method of a glass bulb for a cathode-ray tube including:
- a panel unit having a panel screen;
- a neck unit holding an electron gun;
- and a funnel unit having a funnel-like shape, wherein the panel unit and the neck unit are bridged by the funnel unit, the manufacturing method comprising:
- a glass member preparing step for preparing at least one physically strengthened glass member for the funnel unit, the funnel unit being formed from a plurality of glass members;
- and
- a glass bulb forming step for forming the glass bulb from the plurality of glass members including the glass member which is prepared in the glass member preparing step.
A cathode-ray tube device comprising:
- a glass bulb for the cathode-ray tube including:
- a panel unit having a panel screen;
- a neck unit holding an electron gun;
- and a funnel unit having a funnel-like shape, wherein the panel unit and the neck unit are bridged by the funnel unit, wherein
- the funnel unit is formed from a plurality of glass members, the plurality of glass members including at least a first glass member on a side of the panel unit and a second glass member on a side of the neck unit, and
- a maximum-to-minimum thickness ratio of each of the plurality of glass members is designed to be within a range suitable for producing the plurality of glass members using pressing, the maximum-to-minimum thickness ratio being a ratio of thickness of a thickest portion to thickness of a thinnest portion.
A cathode-ray tube device comprising:
- a glass bulb for the cathode-ray tube including:
- a panel unit having a panel screen;
- a neck unit holding an electron gun;
- and a funnel unit having a funnel-like shape, wherein the panel unit and the neck unit are bridged by the funnel unit, wherein
- physically strengthened glass is used in at least part of the funnel unit.
Dependencies are inferred from the claim text.