| 摘要 |
An optical scanning device includes a vertical cavity surface emitting laser, a driving unit that controls modulation driving, a coupling optical system that couples a beam, an aperture that is configured to define a beam spot diameter, a deflecting unit that deflects a laser beam incoming, and a scanning optical system that guides the laser beam, wherein the driving unit controls so as to satisfy conditions 1 and 2 below: condition 1: P1>P100, condition 2: Wm<Ws, where P1 is an amount of light at a time after a period T1 corresponding to a minimum pixel unit has elapsed since beginning of light emission, P100 is an amount of light at a time after a time period of 100×T1 has elapsed since the beginning of light emission, Wm is a static beam spot diameter in a main-scanning direction, and Ws is a static beam spot diameter in a sub-scanning direction.
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