Title:
OBJECTIVE OPTICAL SYSTEM, IMAGING DEVICE, AND ENDOSCOPE
Document Type and Number:
WIPO Patent Application WO/2022/259420
Kind Code:
A1
Abstract:
Provided are an objective optical system, an imaging device, and an endoscope which are capable of: ensuring lens movement stroke at the time of focus adjustment; suppressing the impact of misalignment and the deterioration of optical performance due to manufacturing error; and setting the baseline length of a left eye objective optical system and a right eye objective optical system so that such length is shorter at the time of 3D viewing. The objective optical system comprises, in order from the object side: a front group FG; an aperture stop S; and a rear group RG. The front group FG includes: a negative refractive power first lens L1 in which a concave surface is faced toward the image side; a negative refractive power second lens L2; and a positive refractive power third lens L3. The rear group includes: a positive refractive power fourth lens L4; and a positive refractive power fifth lens L5. The fifth lens L5 is a cemented lens and satisfies the following conditional expression (1). 2.3 < f3/f5 < 20 (1). Here, f3 represents the focal distance of the third lens L3, and f5 represents the focal distance of the fifth lens L5.
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Inventors:
KAWAKAMI YOSHIHIRO (JP)
Application Number:
PCT/JP2021/021919
Publication Date:
December 15, 2022
Filing Date:
June 09, 2021
Export Citation:
Assignee:
OLYMPUS MEDICAL SYSTEMS CORP (JP)
International Classes:
A61B1/00; G02B13/04; G02B23/26
Domestic Patent References:
| WO2018135269A1 | 2018-07-26 | |||
| WO2019167310A1 | 2019-09-06 |
Foreign References:
| JP2018159853A | 2018-10-11 | |||
| JP2000137164A | 2000-05-16 |
Attorney, Agent or Firm:
SAITO Keisuke (JP)
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