Title:
OCULAR OPTICAL SYSTEM, OBSERVATION DEVICE HAVING THE SAME, AND IMAGE CAPTURING DEVICE
Document Type and Number:
Japanese Patent JP2023161289
Kind Code:
A
Abstract:
To provide an ocular optical system which offers sufficient correction for various aberrations while maintaining a wide angle of view.SOLUTION: An ocular optical system provided herein comprises a first lens having negative refractive power, a second lens having positive refractive power, a third lens having negative refractive power, and a fourth lens having positive refractive power arranged in order from a display element side to an observation side. A focal length f1 of the first lens, a focal length f2 of the second lens, a focal length f3 of the third lens, and a focal length f4 of the fourth lens are each set appropriately.SELECTED DRAWING: Figure 1
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Inventors:
TAKUMI AI
Application Number:
JP2022071582A
Publication Date:
November 07, 2023
Filing Date:
April 25, 2022
Export Citation:
Assignee:
CANON KK
International Classes:
G02B13/18; G02B25/00
Attorney, Agent or Firm:
Takuma Abe
Sougo Kuroiwa
Sougo Kuroiwa