Optical device and optical pickup device

Details Optical device and optical pickup device Optical device and optical pickup device

2005-01-25

2010-11-16

Miller, Brian E (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044410

Reexamination Certificate

active

07835251

ABSTRACT:
An optical device diffracts incident light with a hologram element and receives the diffracted light with light receiving faces20A to29on a light receiving element. Reflected sub-beams used for a tracking operation are received with different ones of the light receiving faces depending on the wavelengths of the reflected sub-beams. When first light receiving faces22, 23, 26, and27are receiving an incident beam of a first wavelength, output signals from the first light receiving faces and output signals from the other light receiving faces24, 25, 28, and29are processed to detect an unnecessary light component. The optical device can record and/or reproduce information signals to and/or from optical discs such as DVDs and CDs which need light sources of different wavelengths, without the influence of unnecessary reflected light from the optical discs or without complicating operation of output signals.

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