Patent US1874849A successfully refreshed from Google Patents.
Patent EP0217003A1 successfully refreshed from Google Patents.
EP0217003A1
Expired / Lapsed
EP
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Fluorescent display tube
Assignee: Noritake Itron Corp
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Filing: 1986-06-25
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Granted: —
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Expires: 2006-06-25
Abstract
Abstract A fluorescent display tube includes a plurality of phosphor screens formed on a front panel of an envelope to constitute a matrix, a plurality of cathode electrodes (7 1,1 to 7 3.3 ) floating from the inner surface of a rear panel (3) of the envelope and corresponding to the phosphor screens so as to constitute a matrix in the same manner as the phosphor screens grid electrodes (8,. 8 2 , 8 3 ) which are arranged between the phosphor screens and the cathode electrodes of the rows of the matrix and each of which has electron beam apertures (9 1 , 9 2 , 9 3 ), and stripe-like back electrodes (10 1 , 10 2 , 10 3 ) formed on the inner surface of the rear panel (3) so as to correspond to the columns of the matrix. A voltage applied to the cathode electrodes (7 1,1 , to 7 3 . 3 ) is higher or lower than that to the grid and back electrodes (8,, 8 2 , 8 3 ; 10 1 , 10 2 , 10 3 ). Light emission of the phosphor screens can be arbitrarily controlled to obtain high resolution with a compact arrangement.
Inventors
- 👤 Masaaki Ise Electronics Corporation Kobayashi
- 👤 Yosiyuki Ise Electronics Corporation Okubo
- 👤 Kazunori Ise Electronics Corporation Tatsuda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 15:03
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/15
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
286 words
A fluorescent display tube comprising an envelope (1) constituted by a front panel (2), a rear panel (3), and a side panel (4), at least said front panel (2) being able to transmit light therethrough, characterized by comprising: a plurality of phosphor screens (5 1,1 - 5 3,3 ) formed on an inner surface of said front panel (2) to constitute a matrix in a first direction and in a second direction perpendicular to the first direction; a plurality of anodes (6 1 , 6 2 ), respectively arranged around said phosphor screens, for accelerating electron beams; a plurality of cathodes (7 1,1 - 7 3,3 ), respectively corresponding to said phosphor screens and supported to float from an inner surface of said rear panel, for emitting the electron beams; plate-like control grids (8 1 - 8 3 ) which are respectively arranged between said phosphor screens (5 1,1 - 5 3,3 ) and said cathodes (7 1,1 7 3,3 ) arranged in the first direction, and which have apertures (9 1 - 9 3 ) for transmitting the electron beams (11) from said cathodes (7 1,1 - 7 3,3 ) to said phosphor screens (5 1,1 - 5 3,3 ); and stripe-like back electrodes (10 1 - 10 3 ) which oppose said cathodes (7 1,1 - 7 3,3 ) aligned on said inner surface of said rear panel (3) along the second direction, wherein voltages applied to said control and back electrodes (8 1 - 8 3 , 10 1 - 10 3 ) are higher or lower than those applied to said cathodes (7 1,1 - 7 3,3 ), thereby controlling light emission of said phosphor screens (5 1,1 - 5 3,3 ).
Claim 2
Dependent Claim
286 words
A fluorescent display tube comprising an envelope (1) constituted by a front panel (2), a rear panel (3), and a side panel (4), at least said front panel (2) being able to transmit light therethrough, characterized by comprising: a plurality of phosphor screens (5 1,1 - 5 3,3 ) formed on an inner surface of said front panel (2) to constitute a matrix in a first direction and in a second direction perpendicular to the first direction; a plurality of anodes (6 1 , 6 2 ), respectively arranged around said phosphor screens, for accelerating electron beams; a plurality of cathodes (7 1,1 - 7 3,3 ), respectively corresponding to said phosphor screens and supported to float from an inner surface of said rear panel, for emitting the electron beams; plate-like control grids (8 1 - 8 3 ) which are respectively arranged between said phosphor screens (5 1,1 - 5 3,3 ) and said cathodes (7 1,1 7 3,3 ) arranged in the first direction, and which have apertures (9 1 - 9 3 ) for transmitting the electron beams (11) from said cathodes (7 1,1 - 7 3,3 ) to said phosphor screens (5 1,1 - 5 3,3 ); and stripe-like back electrodes (10 1 - 10 3 ) which oppose said cathodes (7 1,1 - 7 3,3 ) aligned on said inner surface of said rear panel (3) along the second direction, wherein voltages applied to said control and back electrodes (8 1 - 8 3 , 10 1 - 10 3 ) are higher or lower than those applied to said cathodes (7 1,1 - 7 3,3 ), thereby controlling light emission of said phosphor screens (5 1,1 - 5 3,3 ).
Claim 3
Dependent Claim
27 words
A tube according to claim 1, wherein said phosphor screens (5 1,1 - 5 3,3 ) have a square shape and are arranged close to each other.
Claim 4
Dependent Claim
34 words
A tube according to claim 1, wherein said phosphor screens (5 1,1 - 5 3 , 3 ) are constituted by red, green, and blue phosphor screens, which are provided in the same number.
Claim 5
Dependent Claim
48 words
A tube according to claim 1, wherein each of said cathodes (7 1,1 73,3) is suspended to override a corresponding one of said stripe-like back electrodes (10 1 - 10 3 ) through two support members (17a, 17b) fixed on said inner surface of said rear panel (3).
References Cited (Backward Citations)
US4472658A
Cited
EP0101195A2
Cited
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