US3746853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light emitting devices
Assignee: Nortel Networks Technology Corp
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Filing: 1972-03-10
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Granted: 1973-07-17
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Expires: 1992-03-10
Abstract
Abstract Light emitting arrays in which the light source is positioned between two opposed reflector surfaces. The light from the source is reflected back past the source by a first reflector and then re-reflected by a second reflector back past the light source to the first reflector. A very thin assembly is obtained. The arrangement is particularly suitable for light emitting diodes and can be used for character displays.
Inventors
- 👤 D Effer
- 👤 K Kosman
- 👤 L Boivin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:49
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0013; G02B6/0023; G02B6/0031; Y; Y10; Y10S; Y10S362/00; Y10S362/80; Y10S362/812
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
225 words
A light emitting device for producing widely diffused light comprising: a substantially planar substrate having a reflecting surface thereon; a semiconductor light emitting element mounted on the reflecting surface of said substrate, said light emitting element emitting light laterally in a direction parallel to said substrate and forwardly in a direction normal to said substrate; a body of encapsulating material enclosing said light emitting element, said body of encapsulating material having a front surface and at least one side surface, said side surface being tapered inwardly from said substrate to said front surface; a layer of reflecting material on the side surface of said body of encapsulating material for reflecting the laterally emitted light from said light emitting device downwardly onto the reflecting surface of said substrate; a layer of reflecting material on a portion of the front surface of said body of encapsulating material, said layer of reflecting material on said portion of said front surface being substantially in alignment with said light emitting element and being tapered inwardly from said front surface toward the reflecting surface of said substrate to reflect the forwardly directed light downwardly onto the reflecting surface of said substrate; the remaining portion of the front surface of said body of encapsulating material being light emitting to allow emission of the light reflected by the reflecting surface of said substrate.
Claim 2
Dependent Claim
225 words
A light emitting device for producing widely diffused light comprising: a substantially planar substrate having a reflecting surface thereon; a semiconductor light emitting element mounted on the reflecting surface of said substrate, said light emitting element emitting light laterally in a direction parallel to said substrate and forwardly in a direction normal to said substrate; a body of encapsulating material enclosing said light emitting element, said body of encapsulating material having a front surface and at least one side surface, said side surface being tapered inwardly from said substrate to said front surface; a layer of reflecting material on the side surface of said body of encapsulating material for reflecting the laterally emitted light from said light emitting device downwardly onto the reflecting surface of said substrate; a layer of reflecting material on a portion of the front surface of said body of encapsulating material, said layer of reflecting material on said portion of said front surface being substantially in alignment with said light emitting element and being tapered inwardly from said front surface toward the reflecting surface of said substrate to reflect the forwardly directed light downwardly onto the reflecting surface of said substrate; the remaining portion of the front surface of said body of encapsulating material being light emitting to allow emission of the light reflected by the reflecting surface of said substrate.
Claim 3
Dependent Claim
28 words
A light emitting device as claimed in claim 1, said inwardly tapered layer of reflecting material on said portion of said front surface comprising two intersecting reflecting surfaces.
Claim 4
Dependent Claim
30 words
A light emitting device as claimed in claim 1 including an electrical conductor pattern on said substrate, the reflecting surface of said substrate comprising part of said electrical conductor pattern.
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |