Optical pickup and a wedge beam splitter

Details Optical pickup and a wedge beam splitter Optical pickup and a wedge beam splitter

2007-07-31

2007-07-31

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112280

Reexamination Certificate

active

10424821

ABSTRACT:
An optical pickup for a recording medium includes a light source, an objective lens, a main photodetector, and a front photodetector. The configuration of the optical pickup enables converging or diverging of light to be incident on a plate beam splitter so that light can be received at an effective light receiving region of a front photodetector without interference due to internal reflection occurring in the plate beam splitter. In the alternative, a wedge beam splitter in the optical pickup includes first and second mirror planes at a predetermined angle to transmit and reflect incident light at a predetermined ratio. In the optical pickup, an amount of light that is exactly proportional to an output power of the light source can be detected, where the output power of the light source can be accurately controlled, thereby improving a linearity of the output power of the light source.

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Korean Office Action issued in corresponding Korean Patent Application No. 10-2002-0072837, Aug. 27, 2004.
Office Action issued by the Japanese Patent Office on Dec. 21, 2004 during examination of the corresponding Japanese patent application.

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