Semiconductor laser device with light emission inhibiting means

Patent · Tue Jun 06 04:00:00 EDT 1989

OSTI ID:5522456

Takesue, T; Murahashi, T; Nakazawa, T

This patent describes a semiconductor laser device. The device consists of: a semiconductor laser; a light quantity monitor circuit for monitoring the quantity of light emitted from the semiconductor laser, and for outputting a signal corresponding to the quantity of light emitted from the lase; A/D converting means for converting the signal output from the light quantity monitor circuit into a digital quantity and for providing a digital output; control means for controlling the digital quantity so that the digital output of the A/D converting means is within a predetermined range; D/A converting means for converting the output of the control means into an analog signal; current generating means for supplying the semiconductor laser with a predetermined driving current in accordance with the analog signal; and means for comparing the quantity of light emitted from the laser with a predetermined value.

• Assignee: Konishiroku Photo Industry Co., Ltd., Tokyo
• Patent Number(s): US 4837787
• OSTI ID: 5522456
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
DESIGN
ELECTROMAGNETIC RADIATION
ELECTRONIC CIRCUITS
INHIBITION
LASERS
MEASURING INSTRUMENTS
MONITORS
PULSE CIRCUITS
RADIATIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SIGNAL CONDITIONERS
SOLID STATE LASERS
VISIBLE RADIATION