Patent ID: 8649078
Filing Date: 2014-02-11
Classification: G02B

Abstract:
1. A driver for driving an optical deflector comprising: a mirror; a movable frame for supporting said mirror; a support body surrounding said movable frame; and a first group of piezoelectric actuators serving as cantilevers and a second group of piezoelectric actuators serving as cantilevers alternating with said first group of piezoelectric actuators, said piezoelectric actuators being folded at every actuator and connected from said support body to said movable frame, each of said piezoelectric actuators being in parallel with one axis of said mirror, said driver generating a first drive voltage having first repeated waves each with a first rising period and a first falling period, one of said first rising period and said first falling period being larger than the other, and applying said first drive voltage to said first group of piezoelectric actuators, said driver generating a second drive voltage having second repeated waves each with a second falling period corresponding to said first rising period of said first drive voltage and a second rising period corresponding to said first falling period of said first drive voltage so that said second drive voltage is opposite in phase with said first drive voltage, and applying said second drive voltage to said second group of piezoelectric actuators, wherein frequencies of said first and second repeated waves exclude natural frequencies of a mechanically-vibrating system of said mirror with respect to said axis thereof depending upon said piezoelectric actuators.