Title:
WAVEPLATE ELEMENT AND OPTICAL PICKUP DEVICE
Document Type and Number:
WIPO Patent Application WO/2008/072519
Kind Code:
A1
Abstract:
There is provided a waveplate element capable of mitigating performance degradation
due to incident angle dependency even when the waveplate element is used in an
optical system in which convergent light or divergent light is incident. The
waveplate (10) has a periodic uneven structure having a structural pitch P shorter
than a used wavelength λ. The periodic uneven structure is divided into
at least first to third areas (11, 12, 13) along a diving line drawn perpendicular
to a fast axis in a plane constituted by the fast axis and a slow axis, wherein the
first area has a periodic uneven structure different from those of the second
and third areas disposed on mutually opposite sides of the first area.
More Like This:
Inventors:
IMAE MAKIKO (JP)
MASUDA OSAMU (JP)
MASUDA OSAMU (JP)
Application Number:
PCT/JP2007/073475
Publication Date:
June 19, 2008
Filing Date:
December 05, 2007
Export Citation:
Assignee:
KONICA MINOLTA HOLDINGS INC (JP)
IMAE MAKIKO (JP)
MASUDA OSAMU (JP)
IMAE MAKIKO (JP)
MASUDA OSAMU (JP)
International Classes:
G02B5/30; G11B7/135
Foreign References:
| JP2006260635A | 2006-09-28 | |||
| JP2005332435A | 2005-12-02 | |||
| JP2006318568A | 2006-11-24 | |||
| JP2005285305A | 2005-10-13 |
Download PDF: