Optical pickup, optical information recording/reproducing...

Details Optical pickup, optical information recording/reproducing... Optical pickup, optical information recording/reproducing...

2007-05-08

2007-05-08

Ben, Loha (Department: 2873)

Optical: systems and elements

Collimating of light beam

C359S637000, C369S112010, C369S112040, C369S112050, C369S112090, C369S100000, C369S044230, C369S044370, C369S121000

Reexamination Certificate

active

10975308

ABSTRACT:
Laser beams respectively emitted from a SHG blue laser unit and a red semiconductor laser unit that have photo detectors respectively are turned into parallel lights by a collimator lens and then coupled by a dielectric multi-layer film mirror so as to be propagated on the same optical axis. The dielectric multi-layer film mirror is configured so as to transmit light with a wavelength of 500 nm or shorter and reflect light with a wavelength of 500 nm or longer for both P wave and S wave. The lights that are transmitted and reflected by the dielectric multi-layer film mirror pass through a polarizing hologram and a phase variable wave plate and are focused on an optical disk by an objective lens. In this manner, a simple configuration can realize a compatibility with many types of optical disks and a stable signal detection even when using a polarizing optical detection system.

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