Title:
内視鏡用対物光学系及び内視鏡
Document Type and Number:
Japanese Patent JP7302034
Kind Code:
B2
Abstract:
An objective optical system for an endoscope consisting of, in order from an object side toward an image side: a front group having negative focal power; an aperture stop; and a rear group having positive focal power, wherein: the front group includes only three lenses, which consist of, in order from the object side toward the image side: a first lens having negative focal power; a second lens having negative focal power; and a third lens having positive focal power, the rear group includes only three lenses, which consist of, in order from the object side toward the image side: a fourth lens having positive focal power; a fifth lens having positive focal power; and a sixth lens having negative focal power, the second lens and the third lens are cemented to each other, and the fifth lens and the sixth lens are cemented to each other.
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Inventors:
Tomoyuki Baba
Application Number:
JP2021572747A
Publication Date:
July 03, 2023
Filing Date:
January 19, 2021
Export Citation:
Assignee:
Fujifilm Corporation
International Classes:
G02B13/04; A61B1/00; G02B23/26
Domestic Patent References:
| JP2019109356A | ||||
| JP2277015A | ||||
| JP2016151629A |
Foreign References:
| US20170212329 |
Attorney, Agent or Firm:
Patent Attorney Corporation Taiyo International Patent Office