US3575627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube with screen comprising laser crystals
Assignee: RCA Licensing Corp
•
Filing: 1967-12-29
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Granted: 1971-04-20
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Expires: 1987-12-29
Abstract
Abstract A cathode-ray tube has a screen comprising an array of laser crystals, in which the individual laser crystals emit coherent light in a narrow disclike beam when excited by an electron beam.
Inventors
- 👤 Frederick H Nicoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:13
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/0955; H01S3/0959; H01J; H01J29/00; H01J29/02; H01J29/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
31 words
A cathode-ray tube as described in claim 1 wherein said laser crystals are hexagonal crystals of a material chosen from the group consisting of zinc oxide, zinc sulfide and cadmium sulfide.
Claim 2
Dependent Claim
23 words
A cathode-ray tube as described in claim 2 wherein said hexagonal laser crystals are arranged on said screen with their C axes parallel.
Claim 3
Dependent Claim
16 words
A cathode-ray tube as described in claim 1 wherein said laser crystals consist of gallium arsenide.
Claim 4
Dependent Claim
22 words
A cathode-ray tube as described in claim 4 wherein said laser crystals are arranged on said screen with their long axes parallel.
Claim 5
Dependent Claim
19 words
A cathode-ray tube as described in claim 1 wherein said laser crystals are less than 100 microns in thickness.
Claim 6
Dependent Claim
36 words
A cathode-ray tube as described in claim 1 wherein said array therefor of laser crystals comprises a mixture of laser crystals composed of different materials, said crystals being chosen to emit light at different respective frequencies.
Claim 7
Dependent Claim
22 words
A cathode-ray tube as described in claim 1, wherein said laser crystals are adapted to emit light at a relatively narrow angle.
Claim 8
Dependent Claim
29 words
A cathode-ray tube as described in claim 1 wherein each one of said laser crystals is adapted to emit light in a broad angle in at least one plane.
Claim 9
Dependent Claim
16 words
A cathode-ray tube as described in claim 9 wherein said broad angle is substantially 360* .
Claim 10
Dependent Claim
27 words
A cathode-ray tube as described in claim 9 wherein said crystals are elongated and said plane is substantially perpendicular to the respective major axes of said crystals.
Claim 11
Dependent Claim
28 words
A cathode-ray tube as described in claim 11 wherein said crystal has a hexagonal crystallographic structure and said major axes are the respective C axes of said crystals.
Claim 12
Dependent Claim
38 words
A cathode-ray tube aS described in claim 9, wherein said screen is adapted to emit light at an angle of substantially 180* and comprises means for causing substantially all of said emitted light to pass through said faceplate.
Claim 13
Dependent Claim
24 words
A cathode-ray tube as described in claim 13 wherein said means includes: a first thin layer of a reflecting material adjacent to said crystals.
Claim 14
Dependent Claim
44 words
A cathode-ray tube as described in claim 1 wherein said target structure further includes: a second thin layer of a material having an index of refraction lower than the index of refraction of said laser crystals between said screen and said first thin layer.
References Cited (Backward Citations)
US1988605A
Cited
US3087085A
Cited
FR1335136A
Cited
US3281618A
Cited
US3344300A
Cited
FR1450990A
Cited
US3445826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |