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Patent Searching and Data


Title:
ACHROMATIC LENS SYSTEM AND OPTICAL INSTRUMENT
Document Type and Number:
WIPO Patent Application WO/2008/099945
Kind Code:
A1
Abstract:
An achromatic lens system etc. which is light in weight and easy to manufacture and which can satisfactorily corrects the spherical aberration along with the chromatic aberration. The achromatic lens system is characterized in that it has a cemented plastic lens which is fabricated by joining a plastic lens (L11) having a positive refracting power to a plastic lens (L12) having a negative refracting power and has a positive refracting power as a whole and a contact multilayer diffractive optical element (L11E), the diffractive optical device (L11E) is located nearer to the image than the cemented plastic lens, the diffractive optical device (L11E) is constituted by joining two diffractive device elements (DE11, DE12) made of different optical materials, and the joining surface of the elements is a diffractive optical surface (Gf) having diffractive grating grooves formed thereon.

Inventors:
MATSUMOTO, Miho (C/O NIKON CORPORATION, 2-3 Marunouchi 3-chome, Chiyoda-k, Tokyo 31, 1008331, JP)
松本実保 (〒31 東京都千代田区丸の内3丁目2番3号株式会社ニコン内 Tokyo, 1008331, JP)
MIYAKAWA, Akiko (C/O NIKON CORPORATION, 2-3 Marunouchi 3-chome, Chiyoda-k, Tokyo 31, 1008331, JP)
Application Number:
JP2008/052596
Publication Date:
August 21, 2008
Filing Date:
February 08, 2008
Export Citation:
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Assignee:
NIKON VISION CO., LTD. (3-25, Futaba 1-chome Shinagawa-k, Tokyo 43, 1420043, JP)
株式会社ニコンビジョン (〒43 東京都品川区二葉1丁目3番25号 Tokyo, 1420043, JP)
MATSUMOTO, Miho (C/O NIKON CORPORATION, 2-3 Marunouchi 3-chome, Chiyoda-k, Tokyo 31, 1008331, JP)
松本実保 (〒31 東京都千代田区丸の内3丁目2番3号株式会社ニコン内 Tokyo, 1008331, JP)
International Classes:
G02B13/18; G02B5/18
Attorney, Agent or Firm:
INOUE, Yoshio (3F Garoh Bldg, 1-4 Nihonbashi 3-chome, Chuo-k, Tokyo 27, 1030027, JP)
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