Optical pickup device having a diaphram with a predetermined ape

Details Optical pickup device having a diaphram with a predetermined ape Optical pickup device having a diaphram with a predetermined ape

1997-01-07

1999-11-16

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369118, G11B 700

Patent

active

059869933

ABSTRACT:
An optical pickup device which can obtain a stable reproduction signal by increasing the numerical aperture of an objective lens includes an objective lens facing a disc, a light source for radiating light to the disc via the objective lens, a beam splitter provided between the light source and objective lens for directing the light reflected from the disc in a path different from that of the light travelled from the light source, a photodetector for detecting the light reflected from the disc and travelled via the beam splitter, and a diaphragm provided between the beam splitter and light source and having a predetermined numerical aperture.

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