title: A two-dimensional laser scanning mirror using motion-decoupling electromagnetic actuators.
abstract: This work proposes a two-dimensional (2-D) laser scanning mirror with a novel actuating structure composed of one magnet and two coils. The mirror-actuating device generates decoupled scanning motions about two orthogonal axes by combining two electromagnetic actuators of the conventional moving-coil and the moving-magnet types. We implement a finite element analysis to calculate magnetic flux in the electromagnetic system and experiments using a prototype with the overall size of 22 mm (W) × 20 mm (D) × 15 mm (H) for the mirror size of 8 mm × 8 mm. The upper moving-coil type actuator to rotate only the mirror part has the optical reflection angle of 15.7° at 10 Hz, 90° at the resonance frequency of 60 Hz at ±3 V (±70 mA) and the bandwidth of 91 Hz. The lower moving-magnet type actuator has the optical reflection angle of 16.20° at 10 Hz and 50° at the resonance frequency of 60 Hz at ±5 V (±34 mA) and the bandwidth of 88 Hz. The proposed compact and simple 2-D scanning mirror has advantages of large 2-D angular deflections, wide frequency bandwidth and low manufacturing cost.
authors.affiliation: Department of Mechanical Engineering, Sogang University, 1 Shinsu-dong, Mapo-gu, Seoul 121-742, Korea.
authors.forename: Bu Hyun
authors.initials: BH
authors.lastname: Shin
authors.forename: Dongho
authors.initials: D
authors.lastname: Oh
authors.forename: Seung-Yop
authors.initials: SY
authors.lastname: Lee
references.citation: Opt Lett. 2011 Jun 1;36(11):1963-5
references.pmid: 21633416
references.citation: Sensors (Basel). 2010;10(7):6848-60
references.pmid: 22163580
references.citation: Sensors (Basel). 2009;9(1):631-44
references.pmid: 22389621