Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2005-07-05
2005-07-05
Tran, Thang V. (Department: 2653)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112010
Reexamination Certificate
active
06914870
ABSTRACT:
To implement light quantity monitoring with high frequency responsivity and correction of astigmatic differences of a semiconductor laser with a simple configuration with a fewer parts.Of the light beam output from a semiconductor laser light source101, a peripheral beam component is entered by a light reflection element107into an anterior light monitoring photodetector103formed in the vicinity of a semiconductor laser light source101. Furthermore, the surface of the reflection sphere of the light reflection element is formed anamorphic, and thus condensed to an appropriate size on the photodetector without being focused, providing high frequency responsivity. Furthermore, the light reflection element107is placed inclined at a predetermined angle so as to cancel out astigmatic difference of the optical semiconductor laser light source101. In addition, the photodetector103is placed in the direction so that a reflected light108is bent by an inclination of the light reflection element107, reducing the amount of parallel displacement during adjustment of the light reflection element107.
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Asada Jun-ichi
Matsumiya Hiroaki
Momoo Kazuo
Nagashima Kenji
Nishiwaki Seiji
RatnerPrestia
Tran Thang V.
Vuong Bach Q.
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