Beam expander to change an elliptical light beam emitted from a

Details Beam expander to change an elliptical light beam emitted from a Beam expander to change an elliptical light beam emitted from a

1998-04-09

2000-01-11

Cabeca, John W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, G11B 7135

Patent

active

060143614

ABSTRACT:
An optical head device of the present invention includes: a semiconductor laser for emitting a light beam; a first optical element for converting the light beam emitted from the semiconductor laser into collimated light having an elliptic beam shape; shaping means for shaping the beam shape of the collimated light from an ellipse to a circle; and a second optical element for directing the collimated light having the beam shape which has been shaped into a circle onto an optical information recording medium. The semiconductor laser is located so that a short axis direction of the ellipse is substantially parallel to a rotation axis direction of the optical information recording medium.

REFERENCES:
patent: 5107477 (1992-04-01), Fujita et al.
patent: 5132959 (1992-07-01), Ishika
patent: 5761177 (1998-06-01), Muneyoshi et al.

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