Title:
観察装置及びそれを有する撮像装置
Document Type and Number:
Japanese Patent JP7179598
Kind Code:
B2
Abstract:
An observation device according to the present invention includes an image display element displaying an image, and a finder optical system used for observing the image displayed on an image display surface of the image display element. The finder optical system includes a positive first lens, a negative second lens, and a biconvex positive third lens arranged in this order from the image display surface side to the observation side. A focal length of the second lens, a focal length of the finder optical system, a curvature radius of a lens surface of the second lens on the image display surface side, a curvature radius of a lens surface of the second lens on the observation side, a diagonal length of the image display surface, and a curvature radius of a lens surface of the third lens on the image display surface side are appropriately set.
Inventors:
Nobuo Fumihiro
Application Number:
JP2018226995A
Publication Date:
November 29, 2022
Filing Date:
December 04, 2018
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B25/00; G02B13/18
Domestic Patent References:
| JP6194583A | ||||
| JP2016224239A | ||||
| JP2016166969A | ||||
| JP2013250506A | ||||
| JP2018189750A | ||||
| JP2012068302A | ||||
| JP2016051061A |
Foreign References:
| WO2019054358A1 | ||||
| US20040165278 |
Attorney, Agent or Firm:
Takuma Abe
Sougo Kuroiwa
Sougo Kuroiwa
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