US3678329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube
Assignee: Sony Corp
•
Filing: 1970-06-22
•
Granted: 1972-07-18
•
Expires: 1990-06-22
Abstract
Abstract In a cathode ray tube of the type in which a plurality of electron beams are directed toward a phosphor screen by a beam generating assembly and are made to intersect each other substantially at the optical center of a main focusing electron lens by which all of the beams are focused on the screen, the usual grid electrode assembly is provided with an additional or auxiliary electrode for at least one of the beams, which auxiliary electrode has applied thereto a selected voltage by which the beam cutoff voltages for the plural beams can be maintained at selected values while permitting independent control of the modulation conditions for the several beams.
Inventors
- 👤 Senri Miyaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:53
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/462; B; B82; B82Y; B82Y10/00; H01J29/48; H01J29/51; H01J31/00; H01J31/08; H01J31/10; H01J31/20; H01J31/201; H01J31/203; H01J31/206
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
195 words
A cathode ray tube comprising: A. A phosphor screen; B. Beam producing means to form a plurality of separately modulatable electron beams to impinge on said screen after intersecting each other at a location in the tube between said beam producing means and said screen, said beam producing means comprising: 1. cathode means emitting the electrons to form said beams, and 2. a grid electrode assembly for controlling the electron beams, said grid electrode assembly comprising: a. a first grid electrode, b. a second grid electrode arranged to act on each of said beams, and c. auxiliary electrode means arranged between said first and second grid electrodes in the path of at least one of said beams and having a voltage applied thereto which is related to the potentials of said first and second grid electrodes for achieving independent control of the modulating conditions for said beams; and C. Electron lens means common to all of said beams and comprising main focusing lens means positioned to dispose the optical center thereof substantially at said location in the tube, said lens means comprising a plurality of electrodes arranged between said grid electrode assembly and said screen.
Claim 2
Dependent Claim
195 words
A cathode ray tube comprising: A. A phosphor screen; B. Beam producing means to form a plurality of separately modulatable electron beams to impinge on said screen after intersecting each other at a location in the tube between said beam producing means and said screen, said beam producing means comprising: 1. cathode means emitting the electrons to form said beams, and 2. a grid electrode assembly for controlling the electron beams, said grid electrode assembly comprising: a. a first grid electrode, b. a second grid electrode arranged to act on each of said beams, and c. auxiliary electrode means arranged between said first and second grid electrodes in the path of at least one of said beams and having a voltage applied thereto which is related to the potentials of said first and second grid electrodes for achieving independent control of the modulating conditions for said beams; and C. Electron lens means common to all of said beams and comprising main focusing lens means positioned to dispose the optical center thereof substantially at said location in the tube, said lens means comprising a plurality of electrodes arranged between said grid electrode assembly and said screen.
Claim 3
Dependent Claim
133 words
a grid electrode assembly for controlling the electron beams, said grid electrode assembly comprising: a. a first grid electrode, b. a second grid electrode arranged to act on each of said beams, and C. auxiliary electrode means arranged between said first and second grid electrodes in the path of at least one of said beams and having a voltage applied thereto which is related to the potentials of said first and second grid electrodes for achieving independent control of the modulating conditions for said beams; and C. Electron lens means common to all of said beams and comprising main focusing lens means positioned to dispose the optical center thereof substantially at said location in the tube, said lens means comprising a plurality of electrodes arranged between said grid electrode assembly and said screen.
Claim 4
Dependent Claim
133 words
a grid electrode assembly for controlling the electron beams, said grid electrode assembly comprising: a. a first grid electrode, b. a second grid electrode arranged to act on each of said beams, and C. auxiliary electrode means arranged between said first and second grid electrodes in the path of at least one of said beams and having a voltage applied thereto which is related to the potentials of said first and second grid electrodes for achieving independent control of the modulating conditions for said beams; and C. Electron lens means common to all of said beams and comprising main focusing lens means positioned to dispose the optical center thereof substantially at said location in the tube, said lens means comprising a plurality of electrodes arranged between said grid electrode assembly and said screen.
Claim 5
Dependent Claim
21 words
A cathode ray tube according to claim 1, in which said auxiliary electrode means is provided for each of said beams.
Claim 6
Dependent Claim
68 words
A cathode ray tube according to claim 1, in which there are three of said electron beams directed by said beam producing means in a common plane, said auxiliary electrode means includes an auxiliary electrode for each of said three beams, and the voltage applied to the auxiliary electrode for the central one of said three beams is the same as the potential of said second grid electrode.
Claim 7
Dependent Claim
51 words
A cathode ray tube according to claim 1, in which said plurality of electron beams consists of a central beam and two side beams directed by said beam producing means in a common plane, and said auxiliary electrode means consists of an auxiliary electrode only for each of said side beams.
Claim 8
Dependent Claim
30 words
A cathode ray tube according to claim 4, in which said second grid electrode has a central projection extending toward said first grid electrode through which said central beam passes.
Claim 9
Dependent Claim
83 words
A cathode ray tube according to claim 4, in which there are independent cathode means and an independent first grid electrode for each of said beams, said voltage applied to each auxiliary electrode is different from said potential of said second grid electrode, and said cathode means and first grid electrode for said central beam are arranged relative to each other to provide said central beam with a cutoff voltage that is equal to the cutoff voltage for each of said side beams.
Claim 10
Dependent Claim
28 words
A cathode ray tube according to claim 6, in which said voltage applied to each said auxiliary electrode is greater than said potential of said second grid electrode.
Claim 11
Dependent Claim
40 words
A cathode ray tube according to claim 7, in which said cathode means for said central beam is disposed closer to the respective first grid electrode than are the cathode means and said first grid electrodes for the side beams.
Claim 12
Dependent Claim
52 words
A cathode ray tube according to claim 7, in which said first grid electrodes have apertures for the passage of the respective beams therethrough, and the aperture of said first grid electrode for said central beam is of greater size than the apertures of the first grid electrodes for the side beams.
Claim 13
Dependent Claim
23 words
A cathode ray tube according to claim 7, in which said auxiliary electrodes are disposed relatively near to the respective first grid electrodes.
Claim 14
Dependent Claim
28 words
A cathode ray tube according to claim 6, in which said voltage applied to each said auxiliary electrode is less than said potential of said second grid electrode.
Claim 15
Dependent Claim
28 words
A cathode ray tube according to claim 11, in which said auxiliary electrodes are disposed approximately midway between the respective first grid electrodes and said second grid electrode.
Claim 16
Dependent Claim
40 words
A cathode ray tube according to claim 11, in which said cathode means for said central beam is disposed further from the respective first grid electrode than are the cathode means and said first grid electrodes for the side beams.
Claim 17
Dependent Claim
52 words
A cathode ray tube according to claim 11, in which said first grid electrodes have apertures for the passage of the respective beams therethrough, and the aperture of said first grid electrode for said central beam is of smaller size than the apertures of the first grid electrodes for the side beams.
References Cited (Backward Citations)
US2888606A
Cited
US3028521A
Cited
US2935642A
Cited
US2862144A
Cited
US3289034A
Cited
US3417199A
Cited
US3514663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |