Title:
ENDOSCOPE OBJECTIVE OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2016/204000
Kind Code:
A1
Abstract:
Provided is an endoscope objective optical system having small size, good optical performance, and a bright F number. The present invention is characterized in that a negative first lens L1, a positive second meniscus lens L2 in which the convex face thereof is oriented toward the object side, an aperture diaphragm S, a biconvex third lens L3, and an overall positive cemented lens CL in which a biconvex fourth lens L4 and a negative fifth lens L5 are joined are arranged in this order from the object side, and conditional expressions (1) and (2) are satisfied. (1): -3 ≤ f1/Ih ≤ -1.2. (2): 0.25 ≤ L3_5/L ≤ 0.7. Here, f1 is the focal distance of the first lens L1, Ih is the maximum image height of the endoscope objective optical system, L3_5 is the distance from the object-side face of the third lens L3 to the image-side face of the fifth lens along the optical axis AX, and L is the distance from the object-side face of the first lens L1 to the image surface along the optical axis AX.
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Inventors:
KAMO YUJI (JP)
Application Number:
PCT/JP2016/066668
Publication Date:
December 22, 2016
Filing Date:
June 03, 2016
Export Citation:
Assignee:
OLYMPUS CORP (JP)
International Classes:
G02B13/04; A61B1/00; G02B23/26
Domestic Patent References:
| WO2010119640A1 | 2010-10-21 |
Foreign References:
| KR100457967B1 | 2004-12-03 | |||
| JP2009223183A | 2009-10-01 | |||
| US20140268369A1 | 2014-09-18 |
Attorney, Agent or Firm:
SAITO Keisuke et al. (JP)
Keisuke Saito (JP)
Keisuke Saito (JP)
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