Basic design of linear oscillatory actuator for two-dimensional optical scanner

Abstract

Optical scanners are used in various devices, for example, distribution systems, handy terminals (portable instruments) and so forth. Portable instruments are required to be precise and work efficiently. Recently, there has been increased demand for two-dimensional scanners rather than one-dimensional scanners. To produce such scanners, miniaturization and reducing the thickness of module. The authors propose a linear oscillatory actuator (LOA) with two torsion bars for use in two-dimensional optical scanners. The LOA is smaller and more efficient drive used to generate spring resonance in conventional optical devices. The LOA can vibrate a mirror with a scanning angle of 2° for lengthwise scanning and with a scanning angle of 20° for crosswise scanning. The resonant frequency is 50.5 Hz for crosswise scanning. Moreover, the LOA is safe for practical use because the safety factor of the torsion bars is 9.6.