Title:
光ピックアップ装置
Document Type and Number:
Japanese Patent JP5142057
Kind Code:
B2
Abstract:
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a first light source (11) for emitting first light flux having a first wavelength; a second light source (12) for emitting second light flux having a second wavelength, the first wavelength being different from the second wavelength; a converging optical system (1) having an optical axis and a diffractive portion, and a photo detector (30); wherein in case that the first light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the first light flux is greater than that of any other ordered diffracted ray of the first light flux, and in case that the second light flux passes through the diffractive portion to generate at least one diffracted ray, an amount of n-th ordered diffracted ray of the second light flux is greater than that of any other ordered diffracted ray of the second light flux, where n stands for an integer other than zero.
Inventors:
Kohei Daejeon
Noriichi Arai
Shinichiro Saito
Toshiyuki Kojima
Torihiko Kiriki
Noriichi Arai
Shinichiro Saito
Toshiyuki Kojima
Torihiko Kiriki
Application Number:
JP2011103452A
Publication Date:
February 13, 2013
Filing Date:
May 06, 2011
Export Citation:
Assignee:
Konica Minolta Holdings Co., Ltd.
International Classes:
G11B7/135; G11B7/1374; G02B3/10; G02B5/18; G02B13/00; G02B13/18; G11B7/09; G11B7/126; G11B7/1392; G11B7/00
Domestic Patent References:
| JP9219034A | ||||
| JP973654A | ||||
| JP10149571A | ||||
| JP7272301A |
Attorney, Agent or Firm:
Keijiro Tamura
Kenichi Kobayashi
Kenichi Kobayashi