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Title:
OBJECTIVE LENS AND ENDOSCOPE USING SAME
Document Type and Number:
WIPO Patent Application WO/2011/125539
Kind Code:
A1
Abstract:
Disclosed is an objective lens for an endoscope, said objective lens being suitable for a small and high pixel density image pickup element and having a simple configuration. Also disclosed is the endoscope using the objective lens. The objective lens is configured by sequentially having, from the object side, a negative first lens (L1), a positive second lens (L2), an aperture stop (S), a positive third lens (L3), and a cemented lens (E45) having a positive fourth lens (L4) and a negative fifth lens (L5) bonded together. In the objective lens (1), the cemented lens (E45) satisfies the following conditional equations (1) and (2), where nn is the refractive index of the fifth lens (L5) with respect to the d line, νρ is the Abbe's number of the fourth lens (L4), and νn is the Abbe's number of the fifth lens (L5). (1) nn≥2.0 (2) 12<(νρ-νn)<34

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Inventors:
KATAHIRA, Yuko (43-2 Hatagaya 2-chome, Shibuya-k, Tokyo 72, 〒1510072, JP)
Application Number:
JP2011/057320
Publication Date:
October 13, 2011
Filing Date:
March 25, 2011
Export Citation:
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Assignee:
OLYMPUS MEDICAL SYSTEMS CORP. (43-2, Hatagaya 2-chome Shibuya-k, Tokyo 72, 〒1510072, JP)
オリンパスメディカルシステムズ株式会社 (〒72 東京都渋谷区幡ヶ谷2丁目43番2号 Tokyo, 〒1510072, JP)
International Classes:
G02B13/04; A61B1/00
Attorney, Agent or Firm:
UEDA, Kunio et al. (37F The Landmark Tower Yokohama, 2-2-1 Minatomirai, Nishi-ku, Yokohama-sh, Kanagawa 37, 〒2208137, JP)
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Claims: