US3582573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent diode with 1/e width of less than one mil. and sound recording system
Assignee: Norton Research Corp
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Filing: 1968-12-09
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Granted: 1971-06-01
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Expires: 1988-12-09
Abstract
Abstract An electroluminescent junction diode having sharply peaked light output is used in conjunction with a sound motion picture camera to record sound on motion picture film. Both the P and N portions of the diode have relatively high absorption coefficients to provide an exponential light output having a 1/e width of less than 1.0 mil.
Inventors
- 👤 Allan S Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:24
CPC Classifications
G; G03; G03B; G03B31/00; G02; G02B; G02B23/00; G02B23/24; H; H10; H10H; H10H20/00; H10H20/80
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
202 words
A system for recording data on a photographic film comprising means for creating relative motion between said photographic film and a light source at a constant speed, said light source comprising an electroluminescent junction diode, the plane of the junction being generally perpendicular to the direction of relative motion, one edge of the diode being positioned less than about 0.001 inch from the surface of the film, the junction diode comprising a base crystal containing one type of impurity, a layer on said crystal containing a second type impurity to form a PN junction diode, said diode being formed of a semiconductor material having P and N regions forming a light-emitting PN junction, the P and N regions adjacent the junction each having an absorption coefficient for the light generated in the diode on the order of 100 cm. 1 and above, and the index of refraction of the semiconductor material being at least as great as 2.5, whereby the light emitted from the diode in the vicinity of the plane of the junction has a 1/e width of less than 1.0 mil, and means for modulating current fed to the diode in accordance with a signal to be recorded on film.
Claim 2
Independent Claim
202 words
A system for recording data on a photographic film comprising means for creating relative motion between said photographic film and a light source at a constant speed, said light source comprising an electroluminescent junction diode, the plane of the junction being generally perpendicular to the direction of relative motion, one edge of the diode being positioned less than about 0.001 inch from the surface of the film, the junction diode comprising a base crystal containing one type of impurity, a layer on said crystal containing a second type impurity to form a PN junction diode, said diode being formed of a semiconductor material having P and N regions forming a light-emitting PN junction, the P and N regions adjacent the junction each having an absorption coefficient for the light generated in the diode on the order of 100 cm. 1 and above, and the index of refraction of the semiconductor material being at least as great as 2.5, whereby the light emitted from the diode in the vicinity of the plane of the junction has a 1/e width of less than 1.0 mil, and means for modulating current fed to the diode in accordance with a signal to be recorded on film.
Claim 3
Dependent Claim
13 words
The system of claim 1 wherein the diode is formed of silicon carbide.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |