US 12,405,440 B2
Driving-unit operation method and controller
Yoichi Itagaki, Tokyo (JP); Masahiro Ishikawa, Tokyo (JP); Daisuke Yamaguchi, Tokyo (JP); Michael Brumann, Bienne (CH); and Raphael Hoesli, Nidau (CH)
Assigned to Miniswys S.A, Biel/Bienne (CH); and MITSUMI ELECTRIC CO., LTD., Tokyo (JP)
Appl. No. 17/783,672
Filed by Yoichi Itagaki, Tokyo (JP); Masahiro Ishikawa, Tokyo (JP); Daisuke Yamaguchi, Tokyo (JP); and Miniswys S.A., Bienne (CH)
PCT Filed Nov. 10, 2020, PCT No. PCT/JP2020/041911
§ 371(c)(1), (2) Date Jun. 9, 2022,
PCT Pub. No. WO2021/117404, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-225710 (JP), filed on Dec. 13, 2019.
Prior Publication US 2023/0024495 A1, Jan. 26, 2023
Int. Cl. G02B 7/08 (2021.01); G02B 27/64 (2006.01); G03B 5/00 (2021.01); G03B 13/36 (2021.01)
CPC G02B 7/08 (2013.01) [G02B 27/646 (2013.01); G03B 5/00 (2013.01); G03B 13/36 (2013.01); G03B 2205/0007 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A driving-unit operation method of operating a driving unit for driving a passive element relative to an active element,
the active element including a resonator and at least one excitation section configured to excite a vibration of the resonator,
the resonator including at least one arm extending from a coupling portion of the resonator,
the at least one arm including a contact portion at an outer end of the at least one arm,
the contact portion being movable by vibrational motion of the at least one arm,
the passive element being disposed to be driven by the vibrational motion to move relative to the active element,
the passive element including a first contact region and being disposed such that the first contact region and the first contact portion make contact with each other by a prestressing force when the active element is not excited,
the driving-unit operation method comprising:
driving the at least one excitation section by a drive signal that is a periodic signal including a drive pulse repeated at an excitation frequency, while repeatedly omitting the drive pulse, thereby generating a periodically repeated pulse block with a pulse block duty cycle expressed by a relation Ton/Tb between a pulse block on time (Ton) and a pulse block cycle (Tb); and
modifying the drive signal depending on the position error signal, wherein
in the modifying the drive signal:
in case that a position error signal is within a first range, a shape of the drive pulse is modified into a first driving pulse shape or the excitation frequency is modified by a first excitation frequency detuning value, and the pulse block duty cycle is set to a first pulse block duty cycle value, and
in case that the position error signal is within a second range, the shape of the drive pulse is modified into a second drive pulse shape or the excitation frequency is modified by a second excitation frequency detuning value, and the pulse block duty cycle is set to a second pulse block duty cycle value.