Title:
OBJECTIVE OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2017/119188
Kind Code:
A1
Abstract:
Provided is a bright, high-performance objective optical system capable of focusing in response to a change in the object distance, reducing manufacturing error sensitivity, and being used in a small high pixel imaging element. The objective optical system includes, in the order from an object side, a positive first group G1, a negative second group G2, and a positive third group G3. The objective optical system performs focusing by moving the second group G2. A lens closest to the object is a positive plano-convex lens L8 with the convex surface facing the object. The flat surface of the positive plano-convex lens L8 is attached directly to an imaging surface I or bonded onto a cover glass CG formed on the imaging surface I. The objective optical system satisfies the following conditional expression (1):
5 < ff / f < 8 (1)
Where ff represents a focal length of a positive plano-convex lens arranged closest to the object side, and f represents a focal length of a whole objective optical system during normal observation.
Inventors:
TAKATO HIDEYASU (JP)
Application Number:
PCT/JP2016/083354
Publication Date:
July 13, 2017
Filing Date:
November 10, 2016
Export Citation:
Assignee:
OLYMPUS CORP (JP)
International Classes:
G02B13/04; A61B1/00; G02B23/26
Domestic Patent References:
| WO2014208373A1 | 2014-12-31 |
Foreign References:
| JP2009163256A | 2009-07-23 | |||
| JP2000267002A | 2000-09-29 |
Other References:
See also references of EP 3401718A4
Attorney, Agent or Firm:
SAITO Keisuke et al. (JP)
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