发明名称 LASER LIGHT SOURCE AND OPTICAL PICKUP
摘要 <P>PROBLEM TO BE SOLVED: To provide a laser light source which projects a plurality of wavelengths and reduces return optical noise, and also to provide an optical pickup. <P>SOLUTION: The difference (n1 L1-n2 L2) of the product of first and second effective refractive indexes n1, n2 in each of first and second light emitting parts and first and second resonator lengths L1, L2 is made larger than 0.065mm corresponding to thickness difference or the like of each protection layer of a DVD and a CD. Thereby, the relation between the distance to an optical disc (external resonator length) and a resonator length (inner resonator length) is kept in the state of reduced return noise as for both first and second light emitting parts by setting the distance of a laser light source properly to a DVD and a CD. <P>COPYRIGHT: (C)2005,JPO&NCIPI
申请公布号 JP2005064387(A) 申请公布日期 2005.03.10
申请号 JP20030295461 申请日期 2003.08.19
申请人 SONY CORP 发明人 TANIMOTO TAKESHI
分类号 G11B7/125;H01S5/40 主分类号 G11B7/125
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