US 12,302,041 B2
Optical scanning device, driving method of optical scanning device, and image drawing system
Hirotoshi Yoshizawa, Kanagawa (JP); Shinichiro Sonoda, Kanagawa (JP); Yoshikazu Hishinuma, Kanagawa (JP); Nobuya Tanaka, Kanagawa (JP); and Yasushi Endo, Kanagawa (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on May 6, 2022, as Appl. No. 17/738,868.
Claims priority of application No. 2021-092417 (JP), filed on Jun. 1, 2021.
Prior Publication US 2022/0385866 A1, Dec. 1, 2022
Int. Cl. G02B 26/08 (2006.01); G02B 26/10 (2006.01); H04N 9/31 (2006.01)
CPC H04N 9/3135 (2013.01) [G02B 26/101 (2013.01); G02B 26/105 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An optical scanning device comprising:
a mirror portion that has a reflecting surface on which an incidence ray is reflected;
a first actuator that causes the mirror portion to swing around a first axis which is in a plane including the reflecting surface at a time of a standstill of the mirror portion;
a second actuator that causes the mirror portion to swing around a second axis which is in the plane including the reflecting surface at the time of the standstill of the mirror portion and intersects with the first axis;
a first angle detection sensor that outputs a signal corresponding to an angle of the mirror portion around the first axis;
a second angle detection sensor that outputs a signal corresponding to an angle of the mirror portion around the second axis; and
at least one processor,
wherein the processor is configured to
provide a first driving signal having a first driving frequency to the first actuator,
provide a second driving signal having a second driving frequency to the second actuator,
derive a first average phase delay time by averaging a first phase delay time of the output signal of the first angle detection sensor with respect to the first driving signal in a plurality of cycles,
derive a second average phase delay time by averaging a second phase delay time of the output signal of the second angle detection sensor with respect to the second driving signal in a plurality of cycles,
generate a first reference signal representing that the angle around the first axis is equal to a reference angle based on the first driving signal and the first average phase delay time, and
generate a second reference signal representing that the angle around the second axis is equal to a reference angle based on the second driving signal and the second average phase delay time.