US3576586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable area injection luminescent device
Assignee: Bell and Howell Co
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Filing: 1968-08-05
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Granted: 1971-04-27
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Expires: 1988-08-05
Abstract
Abstract An electroluminescent semiconductor diode having a PN junction extending along an edge thereof and first and second contacts spaced thereon. Forward voltage is applied via the first contact through the PN junction to generate light thereat and the second contact is held at ground potential to limit the spread of light to the vicinity of the first contact. As voltage across the PN junction increases, the light spreads from the first contact to the second contact as a function of such voltage increase. The regions of the semiconductor defining the PN junction can be shaped so that light is generated at a predetermined nonlinear function of the voltage across the PN junction.
Inventors
- 👤 Bernd Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:06
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/30; G; G01; G01D; G01D15/00; G01D15/14; G11; G11B; G11B7/00; G11B7/002; G11B7/003; G11B7/0032; G11B7/12; G11B7/125; G11B7/127; H01S5/10; H10; H10H; H10H20/00; H10H20/80; H10H20/81; H10H20/819; H10H20/83; H10H20/831; H01S5/06; H01S5/062; H01S5/06233; H01S5/06243
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
The device of claim 1 including opposed polished edge portions of said diode defining a laser cavity therebetween, said PN junction extending between said portions.
Claim 2
Dependent Claim
14 words
The device of claim 1 wherein said second and third contact means are equipotential.
Claim 3
Dependent Claim
64 words
A photorecorder, comprising: means generating a signal current to be recorded; a recording station; means for moving photosensitive paper through said recording station; and means at said recording station for emitting light to impinge on said photosensitive paper, comprising an electroluminescent diode of claim 1 responsive to said signal current so that said light spreads lengthwise along said edge as signal current voltage changes.
Claim 4
Dependent Claim
18 words
The device of claim 1 wherein said first and second contacts are disposed entirely within said first region.
Claim 5
Dependent Claim
26 words
The device of claim 5 wherein said first region is shaped to generate light as a predetermined nonlinear function of voltage applied across said PN junction.
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |