US5046798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor light emitting device and apparatus using the same
Assignee: Hitachi Ltd
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Filing: 1989-08-01
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Granted: 1991-09-10
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Expires: 2009-08-01
Abstract
Abstract A collimated-beam generating device using a semiconductor laser includes a two-lens system in which light converged by a first lens is converted into a collimated beam by a second lens, whereby a distance between the semiconductor laser and the first lens is made large, assembly of the device is made easy, and a collimated beam having a small beam diameter can be produced.
Inventors
- 👤 Yasutoshi Yagiu
- 👤 Tetsuo Kumazawa
- 👤 Makoto Shimaoka
- 👤 Kunio Aiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:38
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4204; G02B6/4207; G02B6/4208; G02B6/4209; G02B6/4206; H; H10; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/855; H10W; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
51 words
A semiconductor light emitting device comprising: a semiconductor light emitting element; a first lens for converging light from said semiconductor light emitting element; and a second lens disposed with a focal position thereof aligned with the converging point of said first lens for converting the converged light into a collimated beam.
Claim 2
Dependent Claim
51 words
A semiconductor light emitting device comprising: a semiconductor light emitting element; a first lens for converging light from said semiconductor light emitting element; and a second lens disposed with a focal position thereof aligned with the converging point of said first lens for converting the converged light into a collimated beam.
Claim 3
Dependent Claim
19 words
A semiconductor light emitting device according to claim 1, wherein said semiconductor light emitting element includes a semiconductor laser.
Claim 4
Dependent Claim
20 words
A semiconductor light emitting device according to claim 1, wherein said semiconductor light emitting element includes a light emitting diode.
Claim 5
Dependent Claim
48 words
A semiconductor light emitting device according to claim 1, wherein a distance between said light emitting element and said first lens is not smaller than 0.5 mm, and wherein a diameter of the collimated beam after it passes through said second lens is not larger than 1 mm.
Claim 6
Dependent Claim
42 words
An optical transmission module comprising a semiconductor light emitting device according to claim 1, and one of an optical fiber and an optical isolator, wherein said collimated beam is made incident upon said one of an optical fiber and an optical isolator.
Claim 7
Dependent Claim
48 words
An optical transmission module comprising a semiconductor light emitting device according to claim 1, an optical isolator, and an optical fiber, wherein said collimated beam is made incident upon said optical isolator and is thereafter made incident upon said optical fiber one of directly and through a lens.
Claim 8
Dependent Claim
58 words
A semiconductor light emitting device comprising: a semiconductor light emitting element; a first lens for converging light emitted from the semiconductor light emitting element to a converging point; and a second lens for converting the converged light into a collimated beam, the second lens being disposed such that a focal point thereof is located at the converging point.
Claim 9
Dependent Claim
58 words
A semiconductor light emitting device comprising: a semiconductor light emitting element; a first lens for converging light emitted from the semiconductor light emitting element to a converging point; and a second lens for converting the converged light into a collimated beam, the second lens being disposed such that a focal point thereof is located at the converging point.
Claim 10
Dependent Claim
109 words
A semiconductor light emitting device comprising: a semiconductor light emitting element mounted on a stem; a sealing cap having a central aperture covered by a glass window and fixed to said stem to cover said semiconductor light emitting element; a first lens for converging light from said semiconductor light emitting element through said glass window of said sealing cap; a second lens for converting the light converged by said first lens into a collimated beam; and a cylindrically-shaped lens holder fixed onto said sealing cap and having a central aperture in which said first and second lenses are held such that their optical axes are aligned with each other.
Claim 11
Dependent Claim
109 words
A semiconductor light emitting device comprising: a semiconductor light emitting element mounted on a stem; a sealing cap having a central aperture covered by a glass window and fixed to said stem to cover said semiconductor light emitting element; a first lens for converging light from said semiconductor light emitting element through said glass window of said sealing cap; a second lens for converting the light converged by said first lens into a collimated beam; and a cylindrically-shaped lens holder fixed onto said sealing cap and having a central aperture in which said first and second lenses are held such that their optical axes are aligned with each other.
Claim 12
Dependent Claim
19 words
A semiconductor light emitting device according to claim 8, wherein said semiconductor light emitting element includes a semiconductor laser.
Claim 13
Dependent Claim
20 words
A semiconductor light emitting device according to claim 8, wherein said semiconductor light emitting element includes a light emitting diode.
Claim 14
Dependent Claim
48 words
A semiconductor light emitting device according to claim 8, wherein a distance between said light emitting element and said first lens is not smaller than 0.5 mm, and wherein a diameter of the collimated beam after it passes through said second lens is not larger than 1 mm.
Claim 15
Dependent Claim
42 words
An optical transmission module comprising a semiconductor light emitting device according to claim 8, and one of an optical fiber and an optical isolator, wherein said collimated beam is made incident upon said one of an optical fiber and an optical isolator.
Claim 16
Dependent Claim
48 words
An optical transmission module comprising a semiconductor light emitting device according to claim 8, an optical isolator, and an optical fiber, wherein said collimated beam is made incident upon said optical isolator and is thereafter made incident upon said optical fiber one of directly and through a lens.
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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) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |