Semiconductor laser module, spatial optical transmission system and electronic appliance
AssigneeSharp Kabushiki Kaisha
InventorAtsushi Shimonaka
Life of this patent
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Abstract
A highly sensitive and inexpensive spatial optical transmission system using an LD (Laser Diode) as a light source and making use of the characteristics of a light receiving element is provided. The system includes a laser chip oscillating a laser beam, and a light receiving element receiving and converting to an electric signal the laser beam emitted from the laser chip and propagated through a space. The laser chip oscillates a laser beam having a wavelength of which absorption coefficient at the light receiving element is in a range of 0.001 to 0.3 μm−1.
Claims18
A spatial optical transmission system, comprising:
- a semiconductor laser device oscillating a laser beam;
- and
- a light receiving element receiving and converting to an electric signal the laser beam emitted from said semiconductor laser device and propagated through a space;
- wherein
- said semiconductor laser device oscillates said laser beam having a wavelength of which absorption coefficient at said light receiving element is in a range of 0.001 to 0.3 μm−1.
A semiconductor laser module, comprising:
- a circuit board;
- a semiconductor laser device mounted on said circuit board;
- a silicon based resin, which is a jellied resin having JIS-A hardness of approximately zero after curing, covering at least a light emitting end surface of said semiconductor laser device;
- and
- another sealing resin sealing the semiconductor laser device covered by said silicon based resin on said circuit board.
A semiconductor laser module, comprising:
- a circuit board;
- a semiconductor laser device mounted on said circuit board and having a light emitting surface arranged approximately parallel to a surface of said circuit board;
- and
- a sealing resin sealing said semiconductor laser device on said circuit board.
Dependencies are inferred from the claim text.