Title:
光ピックアップ光学系およびこれを用いた光ピックアップ装置
Document Type and Number:
Japanese Patent JP4437731
Kind Code:
B2
Abstract:
An objective optical system focuses light from a light source onto at least two different types of optical recording media having different substrate thicknesses in order to record or reproduce information onto the optical recording media by using a different light convergence or divergence effect based on a difference in the vibrational direction of the polarization of polarized incident light. This difference may be caused by passing the light through a uniaxial crystal, such as crystallized quartz, that has its optic axis arranged to use an extraordinary ray and an ordinary ray that are subject to different refractive indexes in an objective optical system even though the rays have the same wavelength. Diffractive optics may also be used to enable excellent focusing on more than two recording media. An optical pickup optical system and an optical pickup device using this optical pickup optical system include the objective optical system.
Inventors:
Toshiaki Katsuma
Yu Kitahara
Masao Mori
Tetsuya Ozato
Yu Kitahara
Masao Mori
Tetsuya Ozato
Application Number:
JP2004296952A
Publication Date:
March 24, 2010
Filing Date:
October 08, 2004
Export Citation:
Assignee:
Fujinon Co., Ltd.
International Classes:
G11B7/135
Domestic Patent References:
| JP11039704A | ||||
| JP10069672A | ||||
| JP9043401A | ||||
| JP2003149443A | ||||
| JP10228664A | ||||
| JP2004326858A | ||||
| JP10186224A |
Attorney, Agent or Firm:
Hiroshi Kawano