US 12,249,931 B2
Control apparatus for vibration type motor, and driving apparatus
Hirotaka Shindo, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jul. 30, 2021, as Appl. No. 17/444,091.
Claims priority of application No. 2020-132101 (JP), filed on Aug. 4, 2020.
Prior Publication US 2022/0045629 A1, Feb. 10, 2022
Int. Cl. H02N 2/00 (2006.01); H04N 23/68 (2023.01)
CPC H02N 2/0075 (2013.01) [H04N 23/687 (2023.01)] 14 Claims
OG exemplary drawing
 
1. A control apparatus for a vibration type motor, the control apparatus comprising:
a processor or circuit that serves as a driving signal generating unit configured to generate a driving signal of the vibration type motor; and
a booster circuit configured to boost the driving signal,
wherein the driving signal generating unit sets a duty ratio to a first duty ratio when a driving frequency of the vibration type motor is a first driving frequency, and sets the duty ratio to a second duty ratio higher than the first duty ratio when the driving frequency is a second driving frequency higher than the first driving frequency, and
wherein at the second driving frequency, a current distortion of a current waveform of the vibration type motor is smaller when the duty ratio is set to the second duty ratio than when the duty ratio is set to the first duty ratio.