Title:
COUPLING LENS AND OPTICAL PICKUP DEVICE
Document Type and Number:
WIPO Patent Application WO/2006/025271
Kind Code:
A1
Abstract:
A coupling lens is provided for projecting two luminous fluxes at different angles by using a phase structure, for achieving compatibility between a high-density optical disc and a CD having a wavelength ratio of the using luminous fluxes at approximately 1:2. An optical pickup device provided with the coupling lens thereon is also provided. The coupling lens at least has a first lens part composed of a material having an abbe number (νd1) to a d line that satisfies inequalities of 0<νd1≤40, and the first lens part has a first phase structure.
Inventors:
IKENAKA KIYONO (JP)
Application Number:
PCT/JP2005/015511
Publication Date:
March 09, 2006
Filing Date:
August 26, 2005
Export Citation:
Assignee:
KONICA MINOLTA OPTO INC (JP)
IKENAKA KIYONO (JP)
IKENAKA KIYONO (JP)
International Classes:
G02B5/18; G02B13/00; G02B13/18; G11B7/135
Foreign References:
| JP2004079146A | 2004-03-11 | |||
| JP2003279850A | 2003-10-02 | |||
| JP2004163944A | 2004-06-10 | |||
| JPH11223765A | 1999-08-17 |
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