发明名称 |
Optical pickup, optical information recording/reproducing apparatus using the same, and phase variable wave plate used in the pickup and the apparatus |
摘要 |
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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申请公布号 |
US7035192(B2) |
申请公布日期 |
2006.04.25 |
申请号 |
US20040873931 |
申请日期 |
2004.06.22 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
KITAOKA YASUO;KASAZUMI KEN'ICHI;KUMAGAWA KATSUHIKO;YAMAMOTO KAZUHISA;WADA HIDENORI |
分类号 |
G11B7/00;G11B7/125;G11B7/135;G11B11/00 |
主分类号 |
G11B7/00 |
代理机构 |
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代理人 |
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主权项 |
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