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US 5,665,982 AGranted
Semiconductor photo-device having oblique top surface of stem for eliminating stray light
AssigneeNEC Corporation
InventorMasahiro Torikai
Life of this patent
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Abstract
A semiconductor laser emitting device has a semiconductor laser emitting diode mounded on a heat sink attached to a side surface of a heat conductive stem accommodated in a package; and a top surface of the stem is oblique with respect to the optical path of a laser beam, roughened and topographically coated with an anti-reflecting film so as to drastically decrease a stray light.
Claims6
A semiconductor photo-device comprising:
- a package having a non-transparent wall member and a transparent window member for forming in combination an internal space;
- a semiconductor photo-emitting element provided in said internal space and having a photo-radiating surface for radiating a visual light beam through said transparent window member toward an object outside of said package;
- and
- a stem fixed to said non-transparent wall member in said internal space and supporting said semiconductor photo-emitting element, said stem having a top surface opposed to said transparent window member and declining at 45 degrees with respect to a virtual surface perpendicular to an optical path of said visual light beam so as to prevent said object from a stray light reflecting on said top surface.
1 more element
Dependencies are inferred from the claim text.