By using conventional MEMS processes, we have successfully developed a high accuracy and easily controllable
deformable mirror with simple structure. Our deformable mirror is driven by a single actuator different from a
conventional deformable mirror of multi-actuator type. The deformed shape is controlled by giving strength
distribution on the reverse side of the mirror. Furthermore, we have obtained a reflective film of low stress which had
previously been a challenge.
High data transfer rate has been demanded for data storage devices along increasing the storage capacity. In order to
increase the transfer rate, high-speed data processing techniques in read-channel devices are required. Generally, parallel
architecture is utilized for the high-speed digital processing. We have developed a new architecture of Interpolated
Timing Recovery (ITR) to achieve high-speed data transfer rate and wide capture-range in read-channel devices for the
information storage channels. It facilitates the parallel implementation on large-scale-integration (LSI) devices.
We investigated the effect of the Viterbi detection of partial response in a magneto-optical disk system using a magnetic field modulation recording, and achieve a wide phase margin at 0.4 micrometers /bit.
We have studied the influence of the pit shape upon the amplitude characteristics of the optical channel in an MO disk system, and studied three channel codings to determine their suitability for high-density recording. It is confirmed that magnetic field modulation with pulsed laser irradiation has the highest amplitude characteristics and NRZI format is most adequate for the method at the density of 0.6 micrometers /bit to 1.0 micrometers /bit.