Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1987-02-25
1989-04-25
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250201, 369 45, G01J 132
Patent
active
048250643
ABSTRACT:
In an apparatus for energizing a semiconductor laser array, the semiconductor laser array has first and second laser structures. The first laser beam emitted from the first laser structure is detected and is converted into a first photoelectric signal by a first photodetecting region of a detector. The first photoelectric signal is compared with a first reference signal by a first subtracter and a first comparison signal is outputted from the first subtracter. A first energizing signal for energizing the first semiconductor structure is determined by a first energizing circuit in accordance with the first comparison signal so that the first laser beam is maintained in a predetermined intensity level. The second laser beam emitted from the second laser structure is also detected by a second photodetecting region of the detector and is converted into a second photoelectric signal. The photoelectric signal is also compared by a second subtracter which outputs a second comparison signal. A second energizing signal for energizing the second semiconductor structure is determined by a second energizing circuit in accordance with the second comparison signal so that the second laser beam is maintained in a predetermined level.
REFERENCES:
patent: 4507763 (1985-03-01), Kato
patent: 4546463 (1985-10-01), Opheij et al.
patent: 4660189 (1987-04-01), Tsukamura et al.
patent: 4663751 (1987-05-01), Kaku et al.
patent: 4667316 (1987-05-01), Suda et al.
Kabushiki Kaisha Toshiba
Shami Khaled
Westin Edward P.
LandOfFree
Apparatus for energizing a semiconductor laser array having a pl does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for energizing a semiconductor laser array having a pl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for energizing a semiconductor laser array having a pl will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1197484