Optical pickup for correcting an astigmatic difference of light

Details Optical pickup for correcting an astigmatic difference of light Optical pickup for correcting an astigmatic difference of light

1997-05-29

1999-02-16

Young, W. R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, G11B 700

Patent

active

058727604

ABSTRACT:
An optical pickup for correcting an astigmatic difference of a light by using a collimating lens arranged at an angle with respect to the thickness direction of an active layer of a light source and parallel to the width direction of the active layer, for collimating the light emitted from the light source, is provided. The collimating lens is arranged between an edge emitting laser diode having an active layer and a beam splitter, and corrects the astigmatic difference of the light emitted from the edge emitting laser diode. Therefore, a compact optical pickup can be achieved since additional optical elements for correcting the astigmatic difference of the laser beam are not required.

REFERENCES:
patent: 5500849 (1996-03-01), Noguchi
patent: 5777961 (1998-07-01), Matsui

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