US3698786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage processing of cathode ray tubes
Assignee: RCA Licensing Corp
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Filing: 1970-12-28
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Granted: 1972-10-17
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Expires: 1990-12-28
Abstract
Abstract A cathode ray tube processing conveyor, comprising means for energizing the cathodes and applying a high voltage to the high voltage accelerating electrodes of the tubes, is provided with two rows of magnetic field coils of alternating polarities mounted on opposite sides of the conveyor and adjacent to the path of the tubes therealong, for deflecting the beams and thereby preventing damage to the screen during the application of the high voltage.
Inventors
- 👤 Edward Anthony Gronka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:27
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/484; H01J9/00; H01J9/44; H01J9/445
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
In a method of high-voltage processing of a cathode-ray tube comprising an electron beam source and an electrode for accelerating an electron beam from said source to a luminescent screen, wherein said tube is transported along a given path, said electron beam source is energized, and a high voltage with respect to said source is applied to said electrode to give rise to an electron beam during said transport; the improvement comprising the additional step of establishing a series of different substantially-contiguous magnetic fields at predetermined locations along said path forming a composite substantially-continuous non-uniform magnetic field along said path, whereby said tube, in its travel along said path, is subjected to said non-uniform field for substantially continuously deflecting said electron beam to prevent damage to said screen during the application of said high voltage.
Claim 2
Dependent Claim
135 words
In a method of high-voltage processing of a cathode-ray tube comprising an electron beam source and an electrode for accelerating an electron beam from said source to a luminescent screen, wherein said tube is transported along a given path, said electron beam source is energized, and a high voltage with respect to said source is applied to said electrode to give rise to an electron beam during said transport; the improvement comprising the additional step of establishing a series of different substantially-contiguous magnetic fields at predetermined locations along said path forming a composite substantially-continuous non-uniform magnetic field along said path, whereby said tube, in its travel along said path, is subjected to said non-uniform field for substantially continuously deflecting said electron beam to prevent damage to said screen during the application of said high voltage.
Claim 3
Dependent Claim
34 words
The method of claim 1, wherein said magnetic fields are established by at least one row of magnetic field coils of varying polarity when excited, mounted along said path and adjacent to said tube.
Claim 4
Dependent Claim
35 words
The method of claim 1, wherein said magnetic fields are established by two rows of magnetic field coils of alternating polarities when excited, mounted on opposite sides of said path and adjacent to said tube.
Claim 5
Dependent Claim
22 words
The method of claim 3, wherein the coils on one side are staggered along said path with respect to the opposite coils.
Claim 6
Dependent Claim
67 words
The method of claim 1, wherein said tube includes a cathode, a control grid and a screen grid, which constitute said beam source, and said accelerating electrode is located next to said screen grid; and said cathode and control grid are grounded and said screen grid is maintained at ground + or - 50 volts DC during the application of said high voltage to said accelerating electrode.
Claim 7
Dependent Claim
54 words
The method of claim 5, wherein said tube further includes a second accelerating electrode spaced along the beam path from said first-named accelerator electrode and connected thereto, and a further electrode interposed between said accelerating electrodes, and wherein a low voltage is applied to said further electrode during the application of said high voltage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |