申请公布号:JP4644891(B2)
申请号:JP19990329812
申请日期:1999.11.19
申请公布日期:2011.03.09
分类号:G02B13/00;G11B7/135;G02B5/18;G02B13/18
主分类号:G02B13/00
摘要:PROBLEM TO BE SOLVED: To provide an objective lens, whose aberration is sufficiently compensated, and a light pick up device using the objective lens in the conditions of the different wavelengths of laser beams and the different kinds of thicknesses for base plates. SOLUTION: Objective lens 16 has at least two diffraction surfaces, and has image-forming performance of substantially diffraction limit by the diffracted light beams of the same order with respect to two optical disks 20, having different kinds of thicknesses for cover glasses and two different wavelengths respectively corresponding to the disks, so that the aberration can be sufficiently compensated with respect to the different wavelengths and different kinds of thicknesses for the base plates.
VEHICULE ELECTRIQUE PAR EXEMPLE A DEUX ROUES
SOURCE LASER POUR L'ERADICATION PHOTONIQUE A ONDES MULTIPLES.
METHOD AND KIT FOR EVALUATING RISK OF OVARIAN CANCER IN CARRIERS OF BRC A1 MUTATION
PROCEDE DE FABRICATION D'UNE PEAU MICROPOREUSE EN MATERIAU COMPOSITE
SYSTEME DE FREIN MECANIQUE, NOTAMMENT POUR VEHICULE AUTOMOBILE
Fremgangsmåter og blandinger for sekresjon av heterologe polypeptider
DIGITAL RADIO TELEPHONE FOR A DIGITAL MOBILE RADIO COMMUNICATION SYSTEM
DISPOSITIF ELECTRONIQUE DELIVRANT UNE REFERENCE TEMPORELLE SURE POUR LA PROTECTION D'UN LOGICIEL
Compsn. for oral admin. of acid-labile omeprazole
COUVERCLE SUPERIEUR DES SOUPAPES DE MOTEUR A COMBUSTION INTERNE
COMPOSITION COSMETIQUE DE FIXATION ET DE BRILLANCE