Two-dimensional Random Access Scanner for optical disks

Details Two-dimensional Random Access Scanner for optical disks Two-dimensional Random Access Scanner for optical disks

1997-04-21

1998-06-09

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4424, 369112, 369118, G11B 7095

Patent

active

057646031

ABSTRACT:
A system and a method for optical access of the surface of an optical disk (or another moving media information storage device) with a very short seek time is presented. The system uses two-dimensional deflection of a light (typically laser) beam. The beam reaches a stationary lenslet array, where, at a particular moment, it intercepts a single lenslet. The lenslet focuses the beam to a spot on the information storage surface of the disk. For reading information, the beam is reflected through the lenslet. Taking advantage of the "cat-eye" retro-reflection principle, only one detector (or very few detectors) is needed. Since only one spot at the surface is illuminated at any given moment, this spot gets most of the laser's light, allowing sufficient power concentration when needed for writing information on the disk.

REFERENCES:
patent: 4550249 (1985-10-01), Damen et al.
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patent: 5465238 (1995-11-01), Russell
patent: 5483511 (1996-01-01), Jewell et al.
Ph. Marchand et al., "Motionless-Head for Parallel Readout Optical Disk," SPIE/IST Symp. on Electronic Imaging Science and Technology, Feb. 1992, San Jose, California, published in Proc. SPIE, vol. 1662 (SPIE, Bellingham, WA, 1992).
V.A. Ivanov et al., "Optoelectronic Neuroprocessor Based on Holographic Disk Memeory," Optical Memory and Nerual Networks, vol. 1, pp. 52-62 (1992).
Wai-Hon Lee, "Holographic Optical Head for Compact Disk Applications," Optical Engineering, vol. 28, No. 6, June, pp. 650-653, 1989.

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