Registers – Coded record sensors – Particular sensor structure
Patent
1992-05-08
1994-08-02
Pitts, Harold
Registers
Coded record sensors
Particular sensor structure
235472, 372 29, 372 31, G06K 710
Patent
active
053348265
ABSTRACT:
A semiconductor laser control method and apparatus includes a semiconductor laser, a semiconductor laser control circuit, a drive current measuring unit, a detection unit, a warning unit, and a memory unit. The memory unit stores initial drive current values and corresponding temperatures. The detection unit performs a step of comparing an actual drive current value measured by the drive current measuring unit with the initial drive current value corresponding to an actual temperature. The warning unit performing a step of generating an alarm predicting the expiration of service life of the semiconductor laser, when the actual drive current value exceeds the corresponding initial drive current value by a specified percentage. Consequently, the near expiration of the service life of the semiconductor laser can be confirmed and therefore render the operational effects such as replacement of the semiconductor laser, without causing any hindrance to the operation.
REFERENCES:
patent: 4267439 (1981-05-01), Thomas et al.
patent: 4567360 (1986-01-01), Yamada
patent: 4639606 (1987-01-01), Boles et al.
patent: 5019769 (1991-05-01), Levinson
patent: 5179269 (1993-01-01), Horie et al.
Katoh Hiroaki
Sato Shin'ichi
Fujitsu Limited
Pitts Harold
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