Optical pickup apparatus with single light source module

Details Optical pickup apparatus with single light source module Optical pickup apparatus with single light source module

2007-02-20

2007-02-20

Korzuch, William (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S120000, C369S112040, C369S047250

Reexamination Certificate

active

10389933

ABSTRACT:
An optical pickup apparatus includes a light source module which emits a light beam, a beam splitter which reflects or transmits the light beam emitted from the light source module, an objective lens which focuses the light beam passing through the beam splitter onto a disc, and a photodetector which receives and detects the light beam reflected by the disc, wherein the light source module includes a first light source and a second light source that emit first and second light beams having different wavelengths and are formed into a single module. The optical pickup apparatus further includes a first grating which divides the first light beam emitted from the first light source into three beams of the first light beam and transmits the second light beam emitted from the second light source, and a second grating which transmits the first light beam emitted from the first light source and divides the second light beam emitted from the second light source into three beams of the second light beam. Since the first and second light sources are formed into a single light source module, the number of parts of the optical pickup apparatus can be reduced, and the efficiency of light is improved.

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