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Title:
OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2008/075529
Kind Code:
A1
Abstract:
A small-sized optical system for shooting an image having a 360° omnidirectional angle of filed without adversely influenced by the flare light and a high resolution or projecting an image at a 360° omnidirectional angle of filed. The optical system has a front group (10) including two reflective surfaces and two transmissive surfaces all being rotationally symmetrical with respect to the center axis (1), a rear group (20) being rotationally symmetrical with respect to the center axis and having a positive power, and an aperture (5) coaxial with the center axis. A light beam entering the front group travels through a first transmissive surface (11), is reflected by a first reflective surface (12) provided on the opposite side to the first transmissive surface with the center axis interposed toward the opposite side to the image plane, reflected by a second reflective surface (13) disposed on the same side as the first transmissive surface toward the image plane, exits outside from a transparent medium through a second transmissive surface (14), travels through the rear group (20), and focused onto an image plane (30). The entrance pupil (6Y) in the cross-section including the center axis (1) is disposed near the second reflective surface (13).

Inventors:
TOGINO, Takayoshi (C/O OLYMPUS CORPORATION, 43-2 Hatagaya 2-Chome, Shibuya-K, Tokyo 72, 1510072, JP)
Application Number:
JP2007/072598
Publication Date:
June 26, 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:
G02B17/08; G02B13/06; G02B13/18; G03B21/00; G03B37/00
Foreign References:
JP2006292814A2006-10-26
JP2006243689A2006-09-14
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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