US3814979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoothing optical cathode ray tube
Assignee: TDK Micronas GmbH
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Filing: 1972-09-29
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Granted: 1974-06-04
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Expires: 1992-09-29
Abstract
Abstract An image dissector is combined with an optical cathode ray tube to provide detection and observation of very short duration low level pulses of light. The cathode ray tube includes a photocathode, accelerating grid, fast sweep deflection electrodes and focusing coils to direct electrons onto a slow decay phosphor screen. This is optically coupled to the image dissector having another photocathode, low frequency sweep deflection coils, focusing coils and a scanning aperture which directs electrons into a multiplier for connection to a display or utilization device. The phosphor screen provides temporary storage of short duration light pulses while the slow scan dissector provides discrete output signal pulses of amplitudes proportional to brightness. The device has a sensitivity capable of detecting single photons with a time resolution in the order of picoseconds.
Inventors
- 👤 E Eberhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:09
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/26; H01J31/42; H01J31/44; H01J31/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
296 words
An optical scanning device comprising: a remote source of optical radiation pulses; a first tubular enclosure having a first transparent faceplate at one end; a first electron emissive photosensitive cathode on the inner surface of said first faceplate emitting a first beam of electrons in accordance with the intensity of optical radiation from said source; a phosphor screen at the other end emitting light in accordance with the intensity of electron impingement thereon and having a predetermined decay time; first means for directing and focusing said first electron beam onto said screen; first deflection means between said first photosensitive cathode and screen for rapidly scanning said first electron beam across said screen in a predetermined path; a second tubular enclosure having a second transparent faceplate at one end adjacent said phosphor screen to receive light from said screen; a second electron emissive photosensitive cathode on the inner surface of said second faceplate emitting a second beam of electrons in accordance with the intensity of light from said screen; an apertured scanninG electrode at the other end of said second enclosure; second means for directing and focusing said second electron beam onto said apertured scanning electrode; second deflection means between said second photosensitive cathode and scanning electrode for slowly scanning said second electron beam across the aperture of said scanning electrode at a rate faster than said decay time of said phosphor, said slowly scanning deflection means scanning said second beam in the same relative path as said first rapidly scanning deflection means; electron multiplier means disposed to receive and amplify electrons passing through said aperture; output means providing output signal from said multiplier having an amplitude varying in accordance with the brightness of said light from said screen; and utilization means connected to said output means.
Claim 2
Dependent Claim
296 words
An optical scanning device comprising: a remote source of optical radiation pulses; a first tubular enclosure having a first transparent faceplate at one end; a first electron emissive photosensitive cathode on the inner surface of said first faceplate emitting a first beam of electrons in accordance with the intensity of optical radiation from said source; a phosphor screen at the other end emitting light in accordance with the intensity of electron impingement thereon and having a predetermined decay time; first means for directing and focusing said first electron beam onto said screen; first deflection means between said first photosensitive cathode and screen for rapidly scanning said first electron beam across said screen in a predetermined path; a second tubular enclosure having a second transparent faceplate at one end adjacent said phosphor screen to receive light from said screen; a second electron emissive photosensitive cathode on the inner surface of said second faceplate emitting a second beam of electrons in accordance with the intensity of light from said screen; an apertured scanninG electrode at the other end of said second enclosure; second means for directing and focusing said second electron beam onto said apertured scanning electrode; second deflection means between said second photosensitive cathode and scanning electrode for slowly scanning said second electron beam across the aperture of said scanning electrode at a rate faster than said decay time of said phosphor, said slowly scanning deflection means scanning said second beam in the same relative path as said first rapidly scanning deflection means; electron multiplier means disposed to receive and amplify electrons passing through said aperture; output means providing output signal from said multiplier having an amplitude varying in accordance with the brightness of said light from said screen; and utilization means connected to said output means.
Claim 3
Dependent Claim
126 words
The device of claim 1 wherein said first means for directing and focusing said first beam includes an accelerating grid mesh adjacent said first cathode and means applying a high voltage gradient between said grid and said first cathode, said first deflection means including a pair of horizontal and vertical rods disposed about said beam, and pulse means applying a high gradient high frequency resonant voltage to said first deflection means to rapidly scan said first electron beam across said screen in a rotary path, said second deflection means including deflection coils applying a relatively low frequency sweep current to slowly scan said second electron beam over said aperture following the same said rotary path, and said utilization means includes means for displaying said output signal.
Claim 4
Dependent Claim
26 words
The device of claim 2 wherein said first means for directing and focusing said first beam includes a further accelerating grid mesh adjacent said phosphor screen.
Claim 5
Dependent Claim
18 words
The device of claim 2 including lens means for directing said optical radiation pulses onto said first faceplate.
Claim 6
Dependent Claim
22 words
The device of claim 2 wherein said second faceplate includes means for coupling light from said phosphor screen to said second cathode.
Claim 7
Dependent Claim
30 words
The device of claim 5 wherein said pulse means applies said high frequency voltage to said accelerating grid mesh in synchronism with said voltage applied to said first deflection means.
Claim 8
Dependent Claim
30 words
The device of claim 5 wherein said pulse means applies said high frequency voltage to said horizontal and vertical rods respectively 90* out of phase to provide a circular deflection.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |