US3742284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic camera tube
Assignee: United States Department of the Navy
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Filing: 1971-04-02
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Granted: 1973-06-26
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Expires: 1991-04-02
Abstract
Abstract An ultrasonic camera tube for converting a two-dimensional pattern of sound pressure into an electrical signal which may be displayed by a television picture tube as an equivalent light pattern. The camera tube includes a piezoelectric transducer for converting the sound pressure pattern into an electrical charge pattern. A photocathode mosaic is deposited on the inner face of the transducer. The photocathode mosaic is flooded with light to achieve photoemission of electrons. The charged mosaic elements discharge in vacuum through an adjacent grid and proceed onward to charge the capacitive storage elements on a mosaic screen adjacent to the grid. An electron beam then scans the elements of both cathode and screen mosaics to return them to their original states and also provides the signal readout. Readout is obtained by sensing the current taken from the elements of the mosaic screen during scanning wherein the sensed current is used to reproduce the sound image on a television tube.
Inventors
- 👤 G Sackman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:19
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/495; G; G01; G01N; G01N29/00; G01N29/04; G01N29/06; H01J31/49
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
An electron tube device comprising: a. a transducer element including a plate having first and second sides; b. said first side of said plate being coated with electrical conducting material; c. said second side of said plate being coated with a first mosaic of photoemissive material; d. a light source for illuminating said first mosaic; e. said first mosaic comprising a plurality of first capacitive elements wherein each of said first capacitive elements is electrically isolated from adjacent capacitive elements; f. first means for removing electrons from said plurality of capacitive elements of said first mosaic; and g. second means for storing the number of electrons removed from each of said capacitive elements.
Claim 2
Dependent Claim
113 words
An electron tube device comprising: a. a transducer element including a plate having first and second sides; b. said first side of said plate being coated with electrical conducting material; c. said second side of said plate being coated with a first mosaic of photoemissive material; d. a light source for illuminating said first mosaic; e. said first mosaic comprising a plurality of first capacitive elements wherein each of said first capacitive elements is electrically isolated from adjacent capacitive elements; f. first means for removing electrons from said plurality of capacitive elements of said first mosaic; and g. second means for storing the number of electrons removed from each of said capacitive elements.
Claim 3
Dependent Claim
22 words
The device of claim 1 wherein a. said first and second means and said first mosaic are enclosed in an evacuated envelope.
Claim 4
Dependent Claim
23 words
The device of claim 2 wherein: a. said first means comprises a grid at a positive potential with respect to said first mosaic
Claim 5
Dependent Claim
48 words
The device of claim 3 including: a. said second means comprises a mosaic screen including a plurality of second capacitive elements wherein each of said second capacitive elements is electrically isolated from adjacent elements; and b. said grid being positioned between said first mosaic and said mosaic screen.
Claim 6
Dependent Claim
31 words
The device of claim 4 wherein: a. an electron gun generating an electron beam for scanning said elements of said first mosaic and for scanning said elements of said mosaic screen.
Claim 7
Dependent Claim
131 words
The device of claim 5 wherein: a. said electron beam being discharged from said gun at a potential above the critical voltage of secondary electron emission from said mosaic screen material; b. part of the electrons of said beam striking said elements of said mosaic screen thereby providing a secondary emission of electrons from these elements that exceeds the number of electrons captured by these elements; c. the other part of said beam passing through said mosaic screen and then through said grid and then striking said elements of said first mosaic; d. said grid slowing said other part of said electron beam below the critical voltage; whereby e. secondary emission of electrons from the elements of said first mosaic is less than the number of electrons captured by these elements.
Claim 8
Dependent Claim
61 words
The device of claim 4 wherein: a. the capacitance of each of said first capacitive elements is greater than the capacitance of each of said second capacitive elements; whereby b. the charge transferred from said first capacitive element to said second capacitive element results in a greater voltage on said second capacitive element than the voltage on said first capacitive element.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |