US5005058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-emitting diode with light-transmissive film
Assignee: Eastman Kodak Co
•
Filing: 1990-09-04
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Granted: 1991-04-02
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Expires: 2010-09-04
Abstract
Abstract A light-emitting diode device having a thin film of silicon nitride or the like is selected so that the intensity of the emitted light can be maintained at a more or less constant level even when the temperature of the light-emitting section rises.
Inventors
- 👤 Yukio Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:28
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/84; G; G02; G02B; G02B1/00; G02B1/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A light-emitting diode comprised of a light-emitting section constituted by a P-N junction and a thin film formed adjacent to the light-emitting section and through which light produced in the light-emitting section is transmitted to the outside, the thin film being formed of a material wherein the transmittivity of the thin film increases as the wavelength of the emitted light increases.
Claim 2
Dependent Claim
61 words
A light-emitting diode comprised of a light-emitting section constituted by a P-N junction and a thin film formed adjacent to the light-emitting section and through which light produced in the light-emitting section is transmitted to the outside, the thin film being formed of a material wherein the transmittivity of the thin film increases as the wavelength of the emitted light increases.
Claim 3
Dependent Claim
35 words
The light-emitting diode according to claim 1 wherein the rate of change in the transmittivity T of the thin film relative to the wavelength λ of the emitted light satisfies dT/dλ>10 -3 (nm -1 ).
Claim 4
Dependent Claim
117 words
A light-emitting diode comprised of a light-emitting section constituted by a P-N junction and a thin film formed adjacent to the light-emitting section and through which light produced in the light-emitting section is transmitted to the outside, wherein the thickness d of the thin film is (2m+1)+α<4nd/λ<2(m+1)-β, where m is zero or a positive integer, n is the refractive index of the thin film, β is the wavelength of the emitted light, α is zero or a positive constant and β is zero or a positive constant, the thin film being formed of a material wherein an increase in the wavelength of the emitted light is accompanied by an increase in the transmittivity of the thin film.
Claim 5
Dependent Claim
117 words
A light-emitting diode comprised of a light-emitting section constituted by a P-N junction and a thin film formed adjacent to the light-emitting section and through which light produced in the light-emitting section is transmitted to the outside, wherein the thickness d of the thin film is (2m+1)+α<4nd/λ<2(m+1)-β, where m is zero or a positive integer, n is the refractive index of the thin film, β is the wavelength of the emitted light, α is zero or a positive constant and β is zero or a positive constant, the thin film being formed of a material wherein an increase in the wavelength of the emitted light is accompanied by an increase in the transmittivity of the thin film.
Claim 6
Dependent Claim
35 words
The light-emitting diode according to claim 3 wherein α and β are selected so that the change in transmittivity T of the thin film at an emitted-light wavelength λ satisfies dT/dλ>10 -3 (nm -1 ).
Claim 7
Dependent Claim
13 words
The light-emitting diode of claim 4 wherein the thin film is silicon nitride.
References Cited (Backward Citations)
US4295148A
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US4495514A
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JPS5946071A
Cited
US4570172A
Cited
US4680602A
Cited
JPS6074484A
Cited
JPS61191084A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-01 | 2002-10-01 | 2003-04-02 | $7700.00 | Window Closed / Lapsed |