Optical head device having a pinhole member for removing wavefro

Details Optical head device having a pinhole member for removing wavefro Optical head device having a pinhole member for removing wavefro

1997-10-27

2000-06-06

Neyzari, Ali

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4424, 369 4423, 369112, G11B 7135

Patent

active

060727632

ABSTRACT:
Disclosed is an optical head device for projecting a laser spot on an optical disk and reading out recorded information by detecting a recording state recorded on a recording surface of the optical disk, which has: a collimator lens which converges divergent light emitted from a semiconductor laser; and a pinhole member which removes a wavefront aberration at an outline portion of the light converged by the collimator lens; wherein the collimator lens and the pinhole member are disposed in an image-forming optical system, where a microspot is produced, from the semiconductor laser as a light source to an objective lens, and a wavefront aberration of the semiconductor laser is removed to minimize a wavefront aberration of the image-forming optical system.

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