Optical scanning device, image display device provided with...

Details Optical scanning device, image display device provided with... Optical scanning device, image display device provided with...

2009-03-19

2010-10-19

Stultz, Jessica T (Department: 2873)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S247000, C359S223100

Reexamination Certificate

active

07817322

ABSTRACT:
An optical scanning element performs scanning with light by bringing a mirror portion into a swinging state by generating resonance oscillations of the mirror portion due to torsional oscillations. The optical scanning element has a first resonance frequency and a second resonance frequency which generate longitudinal oscillations and lateral oscillations on a lower region side and a high region side of a resonance frequency of the torsional oscillations respectively. Outputting of a drive signal is started by setting a frequency of a drive signal which is used for oscillating the optical scanning element to a specific frequency which falls between the first resonance frequency and the second resonance frequency and is higher than the resonance frequency of the torsional oscillations and, thereafter, the frequency of the outputted drive signal is shifted to the resonance frequency of the torsional oscillations after outputting of the drive signal is started.

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