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Three-Dimensional Actuator For Optical Head

This paper describes the design and characteristics of a three dimensional actuator for an optical readout head. In order to obtain enough servo gain, it is necessary to reduce the size and weight of the moving parts. Instead of the conventional galvano mirror, this actuator drives the objective lens, which is suspended in the collimated laser beam, towards three directions, vertical, radial and tangential, without tilting. The major advantages of this unique three dimensional actuator lie in reducing a cost of the objective lens and the number of the adjusting points.