Patent ID: 9155148
Filing Date: 2015-10-06
Classification: G02B,G03B,H04N,H05B

Abstract:
1. A light source drive device, comprising: a first current source which provides a predetermined current to a light source corresponding to a predetermined light output; a second current source which provides an overshoot current to the light source synchronized with the predetermined current of the first current source, the overshoot current being an additional current which increases the current applied to the light source; and a processor configured to perform: wherein the overshoot time is set so that the overshoot time is smaller than a time period from the rising of the predetermined current to when a light emission of the light source is detected, wherein the light source drive device further includes: a light detector which receives emitted light from the light source and outputs a signal corresponding to an amount of the emitted light; and an integrator which integrates the signal output from the light detector, wherein the setting of the overshoot time detects the light emission when an integrated value obtained by the integrator becomes equal to or larger than an overshoot time threshold.