Title:
ENDOSCOPE OBJECTIVE LENS AND ENDOSCOPE
Document Type and Number:
Japanese Patent JP2022083845
Kind Code:
A
Abstract:
To provide an endoscope objective lens which offers good correction for chromatic aberration, reduced size, and good optical performance, and to provide an endoscope having the same.SOLUTION: An endoscope objective lens provided herein consists of, in order from the object side: a first lens group consisting of one negative lens; a second lens group consisting of two lenses that are cemented together; an aperture stop; a third lens group consisting of two lenses that are cemented together, the two lenses having refractive power of opposite signs; and a fourth lens group consisting of two lenses that are cemented together, the two lenses having refractive power of opposite signs. The endoscope objective lens satisfies predefined conditional expressions regarding Abbe numbers, length of the lens system, etc.SELECTED DRAWING: Figure 1
Inventors:
HARADA KEISUKE
Application Number:
JP2020195416A
Publication Date:
June 06, 2022
Filing Date:
November 25, 2020
Export Citation:
Assignee:
FUJIFILM CORP
International Classes:
A61B1/00; G02B13/04; G02B23/26
Attorney, Agent or Firm:
Patent Service Corporation Taiyo International Patent Office