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Patent Searching and Data


Title:
WIDE-ANGLE OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2008/072457
Kind Code:
A1
Abstract:
Provided is a wide-angle optical system having a picture angle exceeding 180 degrees and in particular, a small-size and bright ultra-wide-angle imaging optical system and projection optical system having a small F number. The ultra-wide-angle imaging optical system or the projection optical system having a picture angle exceeding 180 degrees and formed only by transmission planes includes: a front group (Gf) formed by at least one meniscus lens (L1) having a negative focal distance; an aperture (S); and a back group (Gb) formed by at least two lenses having a positive focal distance. The transmission plane of at least one plane of the front group (Gf) is formed by an extended rotary free curved surface.

Inventors:
TOGINO, Takayoshi (C/O OLYMPUS CORPORATION, 43-2 Hatagaya 2-Chome, Shibuya-K, Tokyo 72, 1510072, JP)
Application Number:
JP2007/072602
Publication Date:
June 19, 2008
Filing Date:
November 15, 2007
Export Citation:
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Assignee:
OLYMPUS CORPORATION (43-2, Hatagaya 2-Chome Shibuya-K, Tokyo 72, 1510072, JP)
オリンパス株式会社 (〒72 東京都渋谷区幡ヶ谷2丁目43番2号 Tokyo, 1510072, JP)
International Classes:
G02B13/06; G02B13/18; G03F7/20; H01L21/027
Foreign References:
JP2006337691A2006-12-14
JPS4920534B11974-05-25
Attorney, Agent or Firm:
NIRASAWA, Hiroshi et al. (AZUSA PATENT OFFICE, Ueno-Suzuki Bldg. 7th Floor16-3, Ueno 3-Chome,Taito-K, Tokyo 05, 1100005, JP)
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