Optical pickup to circularize light emitted from a light source

Details Optical pickup to circularize light emitted from a light source Optical pickup to circularize light emitted from a light source

1997-06-12

1998-08-18

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369112, 369 4432, G11B 700

Patent

active

057967008

ABSTRACT:
An optical pickup having a beam shaping device for changing an oval-shaped light beam emitted from a light source into a circular light beam, and an astigmatic difference correcting device for correcting the astigmatic difference of the light is provided. The beam shaping device is a cylindrical lens arranged between the light source and a beam splitter, having a convex cross-section, for converging the incident light, e.g., with respect to an X-axial direction. The astigmatic difference correcting device is an astigmatism lens arranged along an optical path between the cylindrical lens and a light path changing device, as a concave lens, for linearly passing light of a certain direction and diverging light of other directions.

REFERENCES:
patent: 4734906 (1988-03-01), Baer et al.
patent: 5239414 (1993-08-01), Reno

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