US3787609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic color filter system
Assignee: TDK Micronas GmbH
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Filing: 1972-06-13
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Granted: 1974-01-22
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Expires: 1992-06-13
Abstract
Abstract An image scanning system employs a solid state color filter providing a plurality of selectable discrete colors which are produced by voltage pulses of different amplitudes applied to the filter in a predetermined sequence. The filter is disposed on the faceplate of an image dissector tube which scans a scene and provides an output signal carrying the color information. A single camera tube with one electron multiplier can generate the three primary colors using a frame sequential, line-sequential, element-by-element or a random scanning system. The output signal may be transmitted to a receiver display tube having a like color filter with synchronized switching voltages or a standard three gun color cathode ray tube.
Inventors
- 👤 C Plumeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:05
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/055; G02F1/0556; H01J31/00; H01J31/08; H01J31/26; H01J31/42; H01J31/46; H04; H04N; H04N23/00; H04N23/10; H04N23/12; H01J2229/00; H01J2229/89; H01J2229/8926
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
An image scanning system comprising: an image dissector tube having a faceplate at one end for receiving a radiation image, a radiation responsive electron emissive photocathode on the inner surface of said faceplate, an apertured electrode at the other end having only one scanning aperture for receiving electrons and one electron multiplier positioned adjacent said aperture, means for directing and focusing electrons from said photocathode onto said apertured electrode, means for repetitively scanning a transverse portion of said photocathode over said aperture of said electrode, a color filter adjacent said faceplate in the path of said radiation image, said filter including a plurality of voltage responsive ferroelectric color elements producing selective colors in accordance with pulses of predetermined voltage amplitudes applied thereto, a pair of transparent electrodes on opposite sides of said filter, and means for applying pulses of selected voltage amplitudes in a predetermined sequence to said filter electrodes, said filter directing radiation images of said selective colors onto said transverse portion of said photocathode, said electron multiplier providing an output signal modulated in accordance with said radiation images of selective colors.
Claim 2
Dependent Claim
183 words
An image scanning system comprising: an image dissector tube having a faceplate at one end for receiving a radiation image, a radiation responsive electron emissive photocathode on the inner surface of said faceplate, an apertured electrode at the other end having only one scanning aperture for receiving electrons and one electron multiplier positioned adjacent said aperture, means for directing and focusing electrons from said photocathode onto said apertured electrode, means for repetitively scanning a transverse portion of said photocathode over said aperture of said electrode, a color filter adjacent said faceplate in the path of said radiation image, said filter including a plurality of voltage responsive ferroelectric color elements producing selective colors in accordance with pulses of predetermined voltage amplitudes applied thereto, a pair of transparent electrodes on opposite sides of said filter, and means for applying pulses of selected voltage amplitudes in a predetermined sequence to said filter electrodes, said filter directing radiation images of said selective colors onto said transverse portion of said photocathode, said electron multiplier providing an output signal modulated in accordance with said radiation images of selective colors.
Claim 3
Dependent Claim
31 words
The system of claim 1 wherein said filter is a thin horizontal strip positioned on said faceplate over said portion of said photocathode, said scanning means successively scanning said photocathode portion.
Claim 4
Dependent Claim
45 words
The system of claim 2 wherein said means for applying pulses to said filter instantaneously applies the same pulse amplitude to the entire filter to produce one color across said strip for each successive scanning, said pulses and color changing in a predetermined sequential pattern.
Claim 5
Dependent Claim
62 words
The system of claim 1 wherein said filter covers an extended vertical portion of said faceplate, said means for applying pulses applies different successive pulses to said filter to produce different respective colors in a repetitive sequential pattern, and said scanning means includes means for vertically scanning successive transverse portions of said photocathode in synchronism with said successive pulses of different colors.
Claim 6
Dependent Claim
68 words
The system of claim 1 including means for transmitting said output signal, means for receiving said signal, and means for displaying said received signal, said display means including a second color filter and second means for applying pulses to said second color filter in synchronism with said first color filter and the first pulse applying means to apply the same selected voltages for displaying the same color images.
Claim 7
Dependent Claim
17 words
The system of claim 1 wherein said filter is a thin plate of ferroelectric lead zirconate-titanate ceramic.
Claim 8
Dependent Claim
33 words
The system of claim 1 wherein said means for applying pulses to said filter applies a plurality of different successive instantaneous pulse amplitudes during the scanning of each elemental area of said photocathode.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |