Title:
OBJECTIVE OPTICAL SYSTEM, IMAGING DEVICE, AND ENDOSCOPE
Document Type and Number:
WIPO Patent Application WO/2021/176509
Kind Code:
A1
Abstract:
Provided are: an objective optical system for which the overall length of the optical system is short, which has a focal function, and which has a simple configuration; an imaging device; and an endoscope. An objective optical system 10 includes, in order from the object side to the image side, a positive front-group GF and a positive rear-group GR. Focusing is carried out by moving the front-group GF in a direction along the optical axis AX. The objective optical system satisfies the following conditional formula (1). (1): ０．３５＜ＦＬ／Ｆｆ＜０．８５. In the formula, Ff is the focal distance of the positive front-group GF, and FL is the focal distance of the entire objective optical system 10 under a normal observation state.
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Inventors:
SAKURADA IPPEI (JP)
Application Number:
PCT/JP2020/008662
Publication Date:
September 10, 2021
Filing Date:
March 02, 2020
Export Citation:
Assignee:
OLYMPUS CORP (JP)
International Classes:
G02B13/04; G02B13/18
Foreign References:
| JP2018185383A | 2018-11-22 | |||
| JP2011013582A | 2011-01-20 | |||
| JP2017003678A | 2017-01-05 | |||
| JP2004020972A | 2004-01-22 | |||
| JP2014174234A | 2014-09-22 | |||
| JP2006003549A | 2006-01-05 | |||
| JP2013232014A | 2013-11-14 | |||
| JP2000352665A | 2000-12-19 |
Attorney, Agent or Firm:
SAITO Keisuke (JP)
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