Subaperture coarse tracking optical system for optical data stor

Details Subaperture coarse tracking optical system for optical data stor Subaperture coarse tracking optical system for optical data stor

1984-07-16

1987-08-11

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369111, 369109, 250202, G11B 7095

Patent

active

046866620

ABSTRACT:
A subaperture optical system for preventing interference between light inadvertently reflected from the protective overcoat of an optical recording disk from disruptively interfering with light reflected from the active layer of the optical recording disk, thereby causing coarse servo tracking errors as the coarse servo actuator carriage translates over the coarse servo tracks on the disk service. The optical system is comprised of a laser light source, a collimating lens system, an astigmatizing lens system, a subaperture mirror, a carriage actuator, a beam relaying telescope, an objective lens, an objective lens focus actuator, a reflected coarse servo beam focusing lens, and a coarse servo detector. The laser issues a beam which follows a first subaperture path that is parallel to, but off center from, the optical axis of an objective lens of the optical system. The beam is formed into a line focused spot which is focused on the disk surface at a non normal angle. The beam reflected by the active layer and the protective overcoat are spatially separated, and therefore do not interfere. The reflected beams follow a second subaperture path to the coarse servo detector, where the reflected signal is detected unaffected by any interference between the reflected beams.

REFERENCES:
patent: 3876841 (1975-04-01), Kramer
patent: 3959581 (1976-05-01), Laub
patent: 3983317 (1976-09-01), Glorioso
patent: 4085423 (1978-04-01), Tsunoda
patent: 4157568 (1979-06-01), Okki
patent: 4165519 (1979-08-01), Gota
patent: 4322838 (1982-03-01), Neumann

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