Optical system for tracing information recording medium with mul

Details Optical system for tracing information recording medium with mul Optical system for tracing information recording medium with mul

1985-02-25

1987-08-25

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 46, G11B 7135

Patent

active

046897810

ABSTRACT:
In an optical system for tracing an optical disk with multiple laser beams, a light beam emitted from a semiconductor laser is collimated by a collimator lens and then is incident on a light reflecting element. The element has a first surface, a first coating layer coated on the first surface, a second surface and a second coating layer coated on the second surface. A first light beam component reflected from the first surface proceeds straight along the optical axis. A second light beam component which passes through the element and is reflected from the second surface proceeds straight in a direction at a slight angle to the optical axis. The first and second light beam components are incident on an objective lens in different directions, and first and second beam spots are formed on a recording layer on the optical disk.

REFERENCES:
patent: 3876841 (1975-04-01), Kramer et al.
patent: 3922069 (1975-11-01), Kishikawa et al.
patent: 3992575 (1976-11-01), Velzel et al.
patent: 4411492 (1983-10-01), Bluege
patent: 4502757 (1985-03-01), Maeda
patent: 4513408 (1985-04-01), Nomura et al.
patent: 4545651 (1985-10-01), Kato et al.

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