Title:
光ピックアップ装置
Document Type and Number:
Japanese Patent JP3948481
Kind Code:
B2
Abstract:
An optical pick-up apparatus comprising: first, second and third light sources for recording and/or reproducing respectively first, second and third optical information recording material; an objective optical element having a diffractive structure on an optical surface of the objective lens, wherein a diffraction efficiency E1 of a first primary diffractive ray is not less than 90%, a diffraction order n1 of the first primary diffractive ray is an odd number, and an output power PW3, which is an output power of the third light source when the third light source emits the third light flux, is emitted is greater than an output power PW1, which is an output power of the first light source when the first light source emits the first light flux.
Inventors:
Ikenaka Seino
Application Number:
JP2005513001A
Publication Date:
July 25, 2007
Filing Date:
August 04, 2004
Export Citation:
Assignee:
Konica Minolta Opto Co., Ltd.
International Classes:
G11B7/135; G02B13/00; G11B7/125; G11B7/1275; G11B7/1374; G11B7/00
Domestic Patent References:
| JP2002298422A | ||||
| JP2004164817A | ||||
| JP200532411A |
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