Title:
撮像光学系および撮像装置
Document Type and Number:
Japanese Patent JP6572644
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To achieve a new retrofocus type imaging optical system.SOLUTION: An imaging optical system has a first lens group 1G having a negative refractive power, an aperture diaphragm S, and a second lens group 2G having a positive refractive power arranged in order from an object side to an image side; the first lens group 1G has a negative lens L1 and a positive lens L2 having a biconcave shape arranged in order from the object side to the image side; the second lens group 2G has a cemented lens of a negative lens L3 and a positive lens L4 having a concave surface directed to the object side arranged on a side of the aperture diaphragm S.SELECTED DRAWING: Figure 1
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Inventors:
Takahiro Nakayama
Application Number:
JP2015131823A
Publication Date:
September 11, 2019
Filing Date:
June 30, 2015
Export Citation:
Assignee:
株式会社リコー
International Classes:
G02B13/04; G02B13/18
Domestic Patent References:
| JP3122607A | ||||
| JP3078716A | ||||
| JP2008107391A | ||||
| JP3100511A | ||||
| JP2005338143A | ||||
| JP2010156762A | ||||
| JP10039207A | ||||
| JP11249008A |
Foreign References:
| WO2014147856A1 | ||||
| US20160070094 | ||||
| US20080180809 | ||||
| US20050259329 | ||||
| US20100165476 | ||||
| US6043941 | ||||
| US6075658 |
Attorney, Agent or Firm:
Shuichi Kudo
Toru Kabayama
Shogo Honda
Toru Kabayama
Shogo Honda