Title:
OBJECTIVE OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2010/119640
Kind Code:
A1
Abstract:
A high-performance objective optical system adaptable to image pick-up elements with a large number of pixels enables focusing according to the variation of the objective point distance and causes less variation of the angle of field when such focusing is carried out. The objective optical system is configured from at least three groups (G1, G2, G3). Since at least one lens group (G2) among the groups moves, focusing according to the variation of the objective point distance is possible. The following conditional expressions are satisfied.
ωf>60 ∙∙∙ (1)-1
ωn>60 ∙∙∙ (1)-2
0.8<ωn/ωf<1.2 ∙∙∙ (2)
where ωf is the maximum half angle of field (°) in the case of far-distance objective point observation, and ωn is the maximum half angle of field (°) in the case of near-distance objective point observation.
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Inventors:
TAKATO HIDEYASU (JP)
Application Number:
PCT/JP2010/002514
Publication Date:
October 21, 2010
Filing Date:
April 06, 2010
Export Citation:
Assignee:
OLYMPUS MEDICAL SYSTEMS CORP (JP)
TAKATO HIDEYASU (JP)
TAKATO HIDEYASU (JP)
International Classes:
G02B13/04; A61B1/00; G02B23/26
Foreign References:
| JPH05273459A | 1993-10-22 | |||
| JP2008003108A | 2008-01-10 | |||
| JP2005106878A | 2005-04-21 | |||
| JP2008158198A | 2008-07-10 | |||
| JP2001194580A | 2001-07-19 | |||
| JPS5515005A | 1980-02-01 | |||
| JP2000330015A | 2000-11-30 | |||
| JP2002028126A | 2002-01-29 | |||
| JPS6144283A | 1986-03-03 | |||
| JPH06317744A | 1994-11-15 | |||
| JPH11316339A | 1999-11-16 | |||
| JP2002267002A | 2002-09-18 |
Other References:
See also references of EP 2420880A4
Attorney, Agent or Firm:
NIRASAWA, Hiroshi et al. (JP)
Hiroshi Nirasawa (JP)
Hiroshi Nirasawa (JP)
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