Title:
OCULAR OPTICAL SYSTEM, OBSERVATION DEVICE HAVING THE SAME, AND IMAGE CAPTURING DEVICE
Document Type and Number:
Japanese Patent JP2022188374
Kind Code:
A
Abstract:
To provide an ocular lens capable of securing a long eye relief with a wide angle of view while nicely suppressing aberrations.SOLUTION: An ocular optical system L0 provided herein is for observing an image displayed on an image display surface of an image display element, comprises a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 having positive refractive power arranged in order from the image display surface side to the observation side, and satisfies a given conditional expression regarding a focal length f1 of the first lens, a focal length f4 of the fourth lens, and a focal length f of the ocular optical system.SELECTED DRAWING: Figure 1
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Inventors:
MATSUDA TAKAO
Application Number:
JP2021096365A
Publication Date:
December 21, 2022
Filing Date:
June 09, 2021
Export Citation:
Assignee:
CANON KK
International Classes:
G02B25/00
Attorney, Agent or Firm:
Ryosuke Fujimoto
Atsuya Mizumoto
Tomoya Hirayama
Atsuya Mizumoto
Tomoya Hirayama