Optimization of Seesaw Swing Arm Actuator Design for Small Form Factor Optical Disk Drive

Abstract

Many small form factor (SFF) optical pickup heads based on the swing arm design utilize a piezoelectric material or the slim metal plate to perform the focusing action. The seesaw-type actuator is a new mechanism used in the focusing action for SFF optical data storage devices. The swing arm nutates along a pivot instead of a hinge in the vertical movement. In this paper, an optimized design of a biaxial voice coil motor (VCM), in which the tracking and focusing VCMs are combined in the rear of the swing arm, is proposed. Simulation and experiment results demonstrate the effectiveness of the proposed design methodology by showing that the stress magnitude distribution characteristics, mechanism stiffness, and driving stability of the optimized design are enhanced in comparison with those of the original.

Prism-type holographic optical element design and verification for the blue-light small-form-factor optical pickup head

“…Shih et al also proposed a system assembly method for precisely aligning components by using virtual images of the photodetector (PD) and laser from the HOE diffraction. Based on the design configuration, there have been a series of studies presented to fulfill and strengthen its feasibility, such as the micro blue-light objective lens with the numerical aperture (NA) of 0.65 [12], the dual-stage seesaw-swivel actuator [13][14][15][16], the astigmatic reflector [17], and the fabrication using microelectromechanical systems (MEMS) technologies [18,19]. The servo characteristics of the design have been successfully verified by Hou et al [20][21][22] for the red-light system and by Lin et al [23] for the blue-light system, respectively.…”

Enhancement of Optical Adaptive Sensing by Using a Dual-Stage Seesaw-Swivel Actuator with a Tunable Vibration Absorber

“…While attempting to reduce the size of optical heads, several works have scaled down all components of a conventional unit [ 1 , 2 ] and simplified the optical configuration, and micro optical elements, such as lenses and prisms. Other approaches integrate an optical module with a seesaw swivel actuator [ 3 , 4 ].…”