Back to results
US 4,901,325 AGranted
Semiconductor laser device
AssigneeHitachi, Ltd.
InventorsTakeshi Kato, Kenichi Mizuishi, Katuaki Chiba, Takeshi Nakao, Masahiro Ojima, Shigeru Nakamura, Takeshi Maeda
Life of this patent
Estimating the term…
Abstract
A semiconductor laser device utilizing at least a pair of semiconductor laser chips; and a fixing device for fixing the semiconductor laser chips so that electrode surfaces are approximately parallel and opposite to each other and the interval between light emitting spots of the semiconductor laser chips is small.
Claims19
A semiconductor laser device comprising:
- a first semiconductor laser chip including first and second chip surfaces which are parallel to each other, a first active layer which is located between and parallel to said first and second chip surfaces, said first active layer being positioned closer to said first chip surface than said second chip surface, and a light emitting surface;
- a second semiconductor laser chip including first and second chip surfaces which are parallel to each other, a second active layer which is located between and parallel to said first and second ship surfaces, said second active layer being positioned closer to said first chip surface than said second chip surface, and a light emitting surface;
- means for exciting said first and second semiconductor laser chips;
- supporting means for supporting said first and second semiconductor laser chips such that said first surface of said first semiconductor laser chip and said first surface of said second semiconductor laser chip are substantially parallel and opposite to each other.
1 more element
An apparatus comprising:
- a first semiconductor laser chip including first and second chip surfaces which are parallel to each other, a first active layer which is located between and parallel to said first and second chips surfaces, said first active layer being positioned closer to said first chip surface than said second chip surface, and a light emitting surface;
- a second semiconductor laser chip including first and second chip surfaces which are parallel to each other, a second active layer which is located between and parallel to said first and second chip surfaces, said second active layer being positioned closer to said first chip surface than said second chip surface, and a light emitting surface which is separated from said light emitting surface of said first semiconductor laser chip by a distance d.sub.1 ;
- supporting means for supporting said first and second laser chips such that said first surface of said first laser chip and said first surface of said second laser chip are substantially parallel and opposite to each other;
- collimating means including a first lens having a predetermined focal length f.sub.c for collimating first and second laser beams emitted from said first and second semiconductor laser chips;
- and
- focusing means including a second lens having a predetermined focal length f.sub.F for focusing said first and second laser beams, after said laser beams are collimated by said collimating means, onto an information recording medium so as to form collected light spots on said information recording medium which are separated from each other by a distance of D.sub.1.
3 more elements
Dependencies are inferred from the claim text.