Title:
OPTICAL ELEMENT DESIGNING METHOD, OPTICAL ELEMENT AND OPTICAL PICKUP DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/145202
Kind Code:
A1
Abstract:
Provided are a method for designing an optical element for an optical pickup device,
an optical element and an optical pickup device. The optical element has excellent
wavelength characteristics and suitably records and/or reproduces information
on and/or from different optical discs but is easy to manufacture. A first basic
structure and a second basic structure are superposed each other by having the
directions of blazed portions of the structures opposite to each other, and while
having a single optical path difference adding structure, which is easy to manufacture,
the light quantity of a uth diffracted light of a first luminous flux is
increased to the maximum and the light quantity of an xth diffracted light
(x satisfies a formula (1)) is increased to the maximum. Thus, for instance,
a spherical aberration due to the protection board thicknesses of a first optical
disc and a second optical disc can be corrected, and a chromatic aberration due
to changes of the light source wavelength of a first light source can be corrected
(including elimination of chromatic aberration and giving a prescribed chromatic
aberration), and the optical element for the optical pickup device is designed
for suitably recording and/or reproducing information.
Inventors:
NAKAMURA, Kentarou (Inc.2970, Ishikawa-mach, Hachioji-shi Tokyo 05, 1928505, JP)
中村 健太郎 (〒05 東京都八王子市石川町２９７０番地コニカミノルタオプト株式会社内 Tokyo, 1928505, JP)
中村 健太郎 (〒05 東京都八王子市石川町２９７０番地コニカミノルタオプト株式会社内 Tokyo, 1928505, JP)
Application Number:
JP2007/061798
Publication Date:
December 21, 2007
Filing Date:
June 12, 2007
Export Citation:
Assignee:
Konica Minolta Opto, Inc. (2970, Ishikawa-machiHachioji-shi, Tokyo 05, 1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町２９７０番地 Tokyo, 1928505, JP)
NAKAMURA, Kentarou (Inc.2970, Ishikawa-mach, Hachioji-shi Tokyo 05, 1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町２９７０番地 Tokyo, 1928505, JP)
NAKAMURA, Kentarou (Inc.2970, Ishikawa-mach, Hachioji-shi Tokyo 05, 1928505, JP)
International Classes:
G02B5/18; G02B13/00; G02B13/18; G11B7/135
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