Tracking and focussing functions in optical disk apparatus

Details Tracking and focussing functions in optical disk apparatus Tracking and focussing functions in optical disk apparatus

1992-02-18

1994-01-11

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 44230, 369 44370, 369112, 369121, 385132, G11B 7095

Patent

active

052788121

ABSTRACT:
In optical apparatus for reading, writing or erasing optical disks, the optical head is implemented in integrated form. Silicon optical bench technology, including integrated optical waveguides, Y-splitters and directional couplers, is used in the design of the tracking, lens focussing, and read/write/erase functions.

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patent: 4478483 (1984-10-01), Sprague
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patent: 4998793 (1991-03-01), Henry et al.
patent: 5070488 (1991-12-01), Fukushima et al.
patent: 5195152 (1993-03-01), Gupta
Patent Abstracts of Japan, vol. 9, No. 190, (P-378), Aug. 7, 1985, and p. 60-059547.
SPIE vol. 935 Gradient-Index Optics and Miniature Optics (1988) Glenn T. Sincerbox, "Miniature Optics for Optical Recording" pp. 63-75.
Katagiri et al., "A Monolithic Three-Channel LD-PD Array with Vertically Staggered facets for Autofocusing Reflectivity Sensors", IEEE Photonics Technology Letters, May 4, 1992, No. 5, pp. 476-479.

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