Endoscope object optical system - Olympus Endo Technology America Inc.

Title:

Endoscope object optical system

Document Type and Number:

Japanese Patent JP6161520

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To secure a flange back even at a wide angle of view.SOLUTION: An endoscope objective lens optical system comprises, in order from an object side: a first lens group G1 that has a negative refractive power; a second lens group G2 that has a positive refractive power; a luminosity stop; a third lens group G3 that has the positive refractive power; and two reflection surfaces. The endoscope objective lens optical system satisfies following conditional expressions: Fb/FL>3.2...(1), d3/fl3<0.1...(2), and fl1/FL>-0.8...(3) where FL is denoted as a focal length, Fb is denoted as a distance from a final lens surface to an imaging surface, fl1 is denoted as a focal length of the first lens group, fl3 is denoted as a focal length of the third lens group, and d3 is denoted as a distance to the third lens group from the stop.

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Inventors:

Yasushi Namii
Ikutoshi Fukushima

Application Number:

JP2013235949A

Publication Date:

July 12, 2017

Filing Date:

November 14, 2013

Export Citation:

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Assignee:

Olympus Endo Technology America Inc.

International Classes:

G02B13/04; A61B1/00; G02B13/18; G02B23/26

Foreign References:

WO2011049195A1
WO2013114725A1

Attorney, Agent or Firm:

Kunio Ueda
Noriharu Fujita

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