Light scanning apparatus and method to prevent damage to an...

Details Light scanning apparatus and method to prevent damage to an... Light scanning apparatus and method to prevent damage to an...

2006-08-03

2008-10-14

Amari, Alessandro (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S199200, C359S900000, C250S234000, C250S235000, C250S236000

Reexamination Certificate

active

07436564

ABSTRACT:
A light scanning apparatus makes a light beam scan along a main scanning direction on an effective scanning region having a predetermined width. A deflector includes an oscillation mirror which deflects the light beam and makes the light beam scan a second scanning range which contains but extends beyond a first scanning range corresponding to the effective scanning region A detector detects the scanning light beam which moves through a position outside the first scanning range but within the second scanning range, and outputs a detection signal A controller drives the oscillation mirror based on the detection signal and accordingly adjusts the amplitude of the oscillation mirror, and stops driving the oscillation mirror when the detection signal is not outputted from the detector even though a light source is turned on to emit the light beam.

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