Title:
A finder light study system and an imaging device
Document Type and Number:
Japanese Patent JP6071504
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a high-performance finder optical system which offers high observation magnification to allow observation of large finder images, has a sufficiently long eye relief, and is well corrected for chromatic aberration, and to provide an image capturing device having the same.SOLUTION: A finder optical system is for observing an object image formed on a predefined plane by an image capturing optical system and comprises, in order toward an observation side, an image reversing member for forming an erected image, a first lens group having negative refractive power, a second lens group which has positive refractive power and is moved in an optical axis direction to adjust diopter, and a third lens group having positive or negative refractive power. A refractive index nd1 and an Abbe number vd1 of a first lens belonging to the first lens group, and a refractive index nd2 and an Abbe number vd2 of a second lens belonging to the second lens group satisfy predetermined conditions.
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Inventors:
Tomohiro Ino
Application Number:
JP2012269257A
Publication Date:
February 01, 2017
Filing Date:
December 10, 2012
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B25/00; G02B13/18
Domestic Patent References:
| JP2010237430A | ||||
| JP11109259A | ||||
| JP64081925A |
Attorney, Agent or Firm:
Yukio Takanashi