Rotary access arm for optical disks

Details Rotary access arm for optical disks Rotary access arm for optical disks

1987-12-29

1988-12-27

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Having power driven transducer assembly

369222, 369244, G11B 308, G11B 700, G11B 2110

Patent

active

047945869

ABSTRACT:
A rotary access arm, e.g. for an optical disk has crossed voice coil actuators (6a,b) for in-plane and vertical movements, e.g. track and focus control; the actuators are secured to its distal end in close proximity to the focussing optical system (5a,b). The heavy elements like laser light source (8) and beam analyzer (11) are arranged near the rotational axis (10) of the arm (or are completely separated therefrom) allowing a very lightweight construction. In an optical storage system using stacked disks coaxial access arms with individual position control are provided. For increased reliability of operation each access arm has two focussing optical systems at its distal end, viewing in opposite directions, and a bistable optical switch (12) to selectively focus the laser beam on one of the two adjacent optical disks. The focussing optical system can be realized with individual lenses or with two conjugate plano-aspheric lenses bonded to a 90.degree. reflection prism.

REFERENCES:
patent: 4310918 (1982-01-01), Hirata
patent: 4408311 (1983-10-01), Suzuki et al.

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