US4731557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid cooling type projection picture tube
Assignee: Hitachi Ltd
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Filing: 1986-06-26
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Granted: 1988-03-15
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Expires: 2006-06-26
Abstract
Abstract A projection picture tube includes a bulb, a sealing chamber disposed in contact with a front surface of a phosphor screen panel of the bulb and sealed with a liquid coolant, and a holding mechanism for holding the sealing chamber by the bulb. The sealing chamber includes a transparent member disposed in front of the phosphor screen panel to be spaced apart therefrom, a heat dissipation member which is disposed between the transparent member and the phosphor screen panel and part of which is in contact with the liquid coolant sealed in the sealing chamber, seal members respectively disposed between the heat dissipation member and the phosphor screen panel and between the heat dissipation member and the transparent member, and a holding piece for holding the transparent member on the heat dissipation member. The holding mechanism is coupled to the heat dissipation member.
Inventors
- 👤 Tetsuo Asano
- 👤 Misao Ikeda
- 👤 Katsuyoshi Tamura
- 👤 Takumi Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:50
CPC Classifications
H; H01; H01J; H01J7/00; H01J7/24; H01J7/26; H01J29/00; H01J29/006
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
145 words
A projection picture tube comprising: a bulb; a sealing chamber disposed in contact with a front surface of a phosphor screen panel of said bulb and sealed with a liquid coolant; and a holding mechanism for holding said sealing chamber by said bulb, said sealing chamber being provided with a transparent member disposed in front of said phosphor screen panel to be spaced apart therefrom, a heat dissipation member which is disposed between said transparent member and said phosphor screen panel and part of which is in contact with the liquid coolant sealed in said sealing chamber, seal members respectively disposed between said heat dissipation member and said phosphor screen panel and between said heat dissipation member and said transparent member, and a holding piece for holding said transparent member on said heat dissipation member, said holding mechanism being coupled to said heat dissipation member.
Claim 2
Dependent Claim
145 words
A projection picture tube comprising: a bulb; a sealing chamber disposed in contact with a front surface of a phosphor screen panel of said bulb and sealed with a liquid coolant; and a holding mechanism for holding said sealing chamber by said bulb, said sealing chamber being provided with a transparent member disposed in front of said phosphor screen panel to be spaced apart therefrom, a heat dissipation member which is disposed between said transparent member and said phosphor screen panel and part of which is in contact with the liquid coolant sealed in said sealing chamber, seal members respectively disposed between said heat dissipation member and said phosphor screen panel and between said heat dissipation member and said transparent member, and a holding piece for holding said transparent member on said heat dissipation member, said holding mechanism being coupled to said heat dissipation member.
Claim 3
Dependent Claim
45 words
A tube according to claim 1, wherein said bulb includes a funnel and said holding mechanism comprises a plate-like member having an opening matching with an outer diameter of said funnel, and a coupling member for coupling said plate-like member to said heat dissipation plate.
Claim 4
Dependent Claim
23 words
A tube according to claim 1, wherein said bulb includes a funnel and a lock portion to which said holding mechanism is locked.
Claim 5
Dependent Claim
19 words
A tube according to claim 3, wherein said lock portion is formed on an outer surface of said funnel.
Claim 6
Dependent Claim
22 words
A tube according to claim 3, wherein said lock portion comprises two arcuated members formed at two sides of a tube axis.
Claim 7
Dependent Claim
21 words
A tube according to claim 3, wherein said lock portion is formed on a side wall of said phosphor screen panel.
Claim 8
Dependent Claim
26 words
A tube according to claim 4, wherein said lock portion is inclined at a given angle with respect to a plane perpendicular to a tube axis.
Claim 9
Dependent Claim
50 words
A tube according to claim 1, wherein said bulb includes a funnel and said holding mechanism comprises a holding member disposed from said heat dissipation member to said funnel along an outer surface of said bulb, and a fixing member for fixing said holding member to said heat dissipation member.
Claim 10
Dependent Claim
25 words
A tube according to claim 3, wherein said lock portion comprises step portions having lock surfaces in a direction substantially perpendicular to a tube axis.
Claim 11
Dependent Claim
30 words
A tube according to claim 3, wherein said lock portion comprises wall portions of said phosphor screen panel, said wall portions having a larger thickness than that of said funnel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |