Title:
接眼レンズ及びそれを有する観察装置、撮像装置
Document Type and Number:
Japanese Patent JP6391371
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an ocular lens having a long eye relief, a wide viewing angle and a compact size, and high optical performance, and an observation device including the same.SOLUTION: An ocular lens includes, in order from an object side to an observation side: a first lens G1 having positive refractive power; a second lens G2 having negative refractive power; a third lens G3 having positive refractive power; a fourth lens G4 having negative refractive power; and a fifth lens G5 having positive refractive power. A focal length of the fifth lens is set to be shorter than a focal length of the third lens, and the focal length of the third lens is set to be shorter than a focal length of the first lens.SELECTED DRAWING: Figure 1
Inventors:
Atsushi Kawamura
Application Number:
JP2014176294A
Publication Date:
September 19, 2018
Filing Date:
August 29, 2014
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B25/00; G03B13/02
Domestic Patent References:
| JP2001272610A | ||||
| JP2006208559A |
Foreign References:
| US3862796 | ||||
| US1759529 |
Attorney, Agent or Firm:
Takuma Abe
Sogo Kuroiwa
Sogo Kuroiwa
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