Laser drive device that drives laser diode, method of controlling the same, and storage medium
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United States of America Patent
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Aug 23, 2016
Grant Date -
Oct 30, 2014
app pub date -
Apr 22, 2014
filing date -
Apr 30, 2013
priority date (Note) -
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Abstract
A laser drive device capable of easily reducing influence of bias light emission and thereby preventing variation in threshold current. A light amount of a laser beam emitted from a laser diode is detected by a photodiode. A drive current supplied to the laser diode is controlled according to the detected light amount to thereby control the amount of light emitted from the laser diode to a plurality of set light amounts. A threshold current is calculated according to the detected light amount and the drive current. The light amounts are changed and selected, and threshold currents calculated with respect to respective set light amounts are compared. A light amount corresponding to a difference in threshold current not less than a predetermined value is set as a set light amount for use in light amount control of the laser diode.
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