Light scanning apparatus and method to prevent damage to an oscillation mirror, reducing its amplitude, in an abnormal control condition via a detection signal outputted to a controller even though the source still emits light

A light scanning apparatus includes a deflector having an oscillation mirror that oscillates about an axis that is orthogonal to a main scanning direction. A detector detects a scanning light beam deflected by the oscillation mirror and moving in a scanning region. A controller adjusts the amplitude of the oscillation mirror based on a detection signal outputted from the detector, and stops driving the oscillation mirror when the detection signal is not outputted from the detector.

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