发明名称 |
OPTICAL RECORDING AND REPRODUCING DEVICE |
摘要 |
PROBLEM TO BE SOLVED: To improve signal quality by increasing the signal light quantity of a light beam for information detection emitted from a prism with a beam splitter. SOLUTION: This optical recording and reproducing device includes a quarter- wave plate 29 for converting the light beam reflected by or transmitted through the joint surfaces 30 of the prism 23 with a beam splitter and made incident on an objective lens to circularly polarized light. The joint surfaces 30 are formed of polarizable films having polarization characteristics in such a manner that the reflectivity or transmittance of the light beam reflected by or transmitted through the joint surfaces 30 and made incident on the quarter-wave plate 29 is larger than 50% and that the transmittance or reflectivity at the time of transmission or reflection through or by the respective joint surfaces 30 after the reflection by the disk is larger than 50%. |
申请公布号 |
JPH09147405(A) |
申请公布日期 |
1997.06.06 |
申请号 |
JP19950302587 |
申请日期 |
1995.11.21 |
申请人 |
MATSUSHITA ELECTRIC IND CO LTD |
发明人 |
TOMITA HIROTOSHI;NAKAMURA TORU;HAYASHI TAKUO |
分类号 |
G11B7/09;G11B7/125;G11B7/135 |
主分类号 |
G11B7/09 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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