Patent US4914668A successfully refreshed from Google Patents.
US4914668A
Expired / Lapsed
US
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Semiconductor laser including a reflection film
Assignee: Mitsubishi Electric Corp
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Filing: 1989-02-10
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Granted: 1990-04-03
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Expires: 2009-02-10
Abstract
Abstract A semiconductor laser device for a laser printer in which a reflection film having reflectance in a range of 45 to 65% is provided on a laser output facet for outputting a laser output beam.
Inventors
- 👤 Yutaka Nagai
- 👤 Yutaka Mihashi
- 👤 Kenji Ikeda
- 👤 Yoichiro Ota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:34
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/02; H01S5/028
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
53 words
In a semiconductor laser device having two facets through which laser light is output, a multiple layer reflection film having a reflectivity of 45 to 65% including at least one layer of amorphous silicon (a-Si) and one layer of alumina (Al 2 O 3 ) disposed on one of the laser output facets.
Claim 2
Dependent Claim
53 words
In a semiconductor laser device having two facets through which laser light is output, a multiple layer reflection film having a reflectivity of 45 to 65% including at least one layer of amorphous silicon (a-Si) and one layer of alumina (Al 2 O 3 ) disposed on one of the laser output facets.
Claim 3
Dependent Claim
28 words
A semiconductor laser device as defined in claim 1 wherein said reflection film comprises a triple layer structure comprising Al 2 O 3 /a-Si/Al 2 O 3 .
Claim 4
Dependent Claim
39 words
A semiconductor device as defined in claim 1 wherein said reflection film comprises a triple layer structure comprising Al 2 O 3 /a-Si/SiO 2 wherein the Al 2 O 3 layer is in contact with the laser output facet.
Claim 5
Dependent Claim
37 words
A semiconductor device as defined in claim 1 wherein said reflection film comprises a triple layer structure comprising SiO 2 /a-Si/Al 2 O 3 wherein the SiO 2 layer is in contact with the laser output facet.
Claim 6
Dependent Claim
39 words
A semiconductor device as defined in claim 1 wherein said reflection film comprises a four layer structure comprising a-Si/SiO 2 /a-Si/Al 2 O 3 wherein the Al 2 O 3 layer is in contact with the laser output facet.
Claim 7
Dependent Claim
37 words
A semiconductor device as defined in claim 1 wherein said reflection film comprises a four layer structure comprising a-Si/Al 2 O 3 /a-Si/SiO 2 wherein the SiO 2 layer is in contact with the laser output facet.
Claim 8
Dependent Claim
34 words
A semiconductor device as defined in claim 1 wherein the reflection film includes at least three layers and the optical thicknesses of the respective layers are one-quarter of the wavelength of the laser light.
Claim 9
Dependent Claim
41 words
A semiconductor device as defined in claim 1 wherein said semiconductor laser device is disposed on a sub-mount which has a heat sink at a surface thereof opposite said laser device including facet protection films disposed on both of said facets.
Claim 10
Dependent Claim
42 words
A semiconductor device as defined in claim 8 wherein laser light output from the laser facet contacting the reflection film is utilized as a laser output beam said laser light output from the other laser facet is utilized as a monitor output.
Claim 11
Dependent Claim
20 words
A semiconductor device as defined in claim 8 wherein said laser facet protection film comprises Al 2 O 3 .
Claim 12
Dependent Claim
13 words
A semiconductor laser device defined in claim 8 wherein said sub-mount comprises silicon.
Claim 13
Dependent Claim
19 words
A semiconductor laser device defined in claim 8 wherein said heat sink comprises one of copper, gold and silver.
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) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |