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US5673349A
Expired / Lapsed
US
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Semiconductor laser module
Assignee: NEC Corp
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Filing: 1996-07-01
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Granted: 1997-09-30
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Expires: 2016-07-01
Abstract
Abstract A semiconductor laser module is described in which the vicinity of one end of optical fiber 22 is fixed to one side wall of the semiconductor laser module 20, an electronic cooling element 23 is secured to the interior bottom surface of a module package 21, and a substrate 24 composed of a metal plate having a two-level construction in which the upper-level portion 24U and the lower-level portion 24D have a level difference h, the upper surface of the electronic cooling element 23 being secured to the lower surface of upper-level portion 24U, a semiconductor laser 25 being secured to the end portion of the upper surface of upper-level portion 24U, and a lens 26 being mounted on the upper surface of lower-level portion 24D of the substrate; whereby the overall height occupied by all components is reduced by the level difference h as compared with a semiconductor laser module in which the lower surface of the substrate is a single plane.
Inventors
- 👤 Tomonari Kosugi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:15
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4204; G02B6/4219; G02B6/4236; G02B6/4237
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
203 words
A semiconductor laser module comprising: a module package of a predescribed shape; a substrate of good heat conductivity composed of a step portion, an upper-level portion which is a flat plate arranged perpendicular to an upper portion of one side wall surface of said step portion, and a lower-level portion which is a flat plate arranged perpendicular to a lower portion of an opposite side wall surface of said step portion so that a lower surface of said lower-level portion being lower than a lower surface of said upper-level portion; a temperature regulation element for regulating temperature having its lower surface secured to an interior bottom surface of said module package and having its upper surface secured to the lower surface of said upper-level portion of said substrate; a semiconductor laser that emits a laser light and that is disposed in the vicinity of one end of said upper-level portion of said substrate; an optical fiber having one end secured at a level of a side-wall portion of said module package which is irradiated by said laser light; and a lens arranged on an upper surface of said lower-level portion of said substrate which optically couples said semiconductor laser and said optical fiber.
Claim 2
Dependent Claim
203 words
A semiconductor laser module comprising: a module package of a predescribed shape; a substrate of good heat conductivity composed of a step portion, an upper-level portion which is a flat plate arranged perpendicular to an upper portion of one side wall surface of said step portion, and a lower-level portion which is a flat plate arranged perpendicular to a lower portion of an opposite side wall surface of said step portion so that a lower surface of said lower-level portion being lower than a lower surface of said upper-level portion; a temperature regulation element for regulating temperature having its lower surface secured to an interior bottom surface of said module package and having its upper surface secured to the lower surface of said upper-level portion of said substrate; a semiconductor laser that emits a laser light and that is disposed in the vicinity of one end of said upper-level portion of said substrate; an optical fiber having one end secured at a level of a side-wall portion of said module package which is irradiated by said laser light; and a lens arranged on an upper surface of said lower-level portion of said substrate which optically couples said semiconductor laser and said optical fiber.
Claim 3
Dependent Claim
53 words
A semiconductor laser module according to claim 1 wherein a level difference between the lower surface of said upper-level portion and the lower surface of said lower-level portion is set such that the upper surface of said lower-level portion of said substrate is lower than an upper surface of said temperature regulation element.
Claim 4
Dependent Claim
38 words
A semiconductor laser module according to claim 1 wherein the lower surface of said lower-level portion of said substrate is arranged in a non-contacting state at a prescribed spacing from the interior bottom surface of said module package.
Claim 5
Dependent Claim
24 words
A semiconductor laser module according to claim 1 wherein said temperature regulation element is an electronic cooling element for electronically cooling said semiconductor laser.
References Cited (Backward Citations)
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Cited
EP0259018A1
Cited
US4752109A
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DE3902579A1
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JPH04356989A
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JPH05281442A
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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) | 2000-09-29 | 2001-03-31 | 2001-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-29 | 2005-03-31 | 2005-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-29 | 2009-03-31 | 2009-09-30 | $7700.00 | Window Closed / Lapsed |