Patent ID: 6370175
Filing Date: 2002-04-09
Classification: H01S,H04N

Abstract:
A laser beam luminous energy correction method for correcting the variation of an output beam according to a beam position or an angle of incidence with a scanned surface when a beam output from a laser is scanned on the scanned surface via a scanning optical system,said correction method comprising the steps of: correcting a current value exceeding a threshold current part having a current value in the vicinity in a spontaneous emission area of an extrapolated point which is an intersection with an axis when a linear part corresponding to a laser emission area in the driving current-to-output beam luminous energy characteristic of said laser is extrapolated up to the axis showing that luminous energy is zero with a correction value for correcting the variation of an output beam according to a beam position or an angle of incidence with the scanned surface; and driving said laser based upon the result of the correction and the threshold current.