Recent studies of miniaturization of optical disk pickups in Japan

Hiroshi Nishihara

doi:10.1117/12.19629

1 August 1990 Recent studies of miniaturization of optical disk pickups in Japan

Hiroshi Nishihara

Proceedings Volume 1248, Storage and Retrieval Systems and Applications; (1990) https://doi.org/10.1117/12.19629
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

Abstract

Miniaturization of optical disk pickups is very important for higher data rate, faster access and lower cost, which are all required in future computer data storage systems. Various proposals that have been made along this direction in Japan for the last few years are reviewed. Proposed pickups for miniaturization are divided into the following four ones: (1) Conventional type pickups: these are miniaturized further by reducing the size and weight of each component as well as the number of components. (2) A laser/photodiode chip pickup: the laser is optically switched by relief of external recording medium, and the pickup is mounted on a flying slider, which eliminates the focus servo system. (3) Pickups with holographic optical elements: HOEs are used for replacement of discrete components. Since a single hologram can have several functions such as beam splitting and focusing, the number of those components can be reduced. Various types of complicated HOEs are proposed for tracking/focusing error detection. (4) A waveguide-type pickup: several optical components such as focusing grating, splitting grating and four photodiode are integrated on a single waveguide chip. These miniaturization research activities will become more important for future development of disk systems.

Citation Download Citation

Hiroshi Nishihara "Recent studies of miniaturization of optical disk pickups in Japan", Proc. SPIE 1248, Storage and Retrieval Systems and Applications, (1 August 1990); https://doi.org/10.1117/12.19629

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