Title:
A variable power optical system, an image pick-up optical apparatus, and digital equipment
Document Type and Number:
Japanese Patent JP5928426
Kind Code:
B2
Abstract:
A zooming optical system has, from the object side, a positive first group, a negative second group, a positive third group, a positive fourth group, and a negative fifth group. During zooming, at least the third to fifth groups move relative to the image plane, and focusing is achieved by moving the fourth group along the optical axis. The conditional formula -1.0 < M5 / f5 < -0.1 is fulfilled, where M5 is the distance along the optical axis from the position of the fifth group at the wide-angle end to the position of the fifth group at the telephoto end and f5 is the focal length of the fifth group.
Inventors:
Shoto Soma
Application Number:
JP2013198787A
Publication Date:
June 01, 2016
Filing Date:
September 25, 2013
Export Citation:
Assignee:
Konica Minolta Co., Ltd.
International Classes:
G02B15/20; G02B13/18
Domestic Patent References:
| JP2014126851A | ||||
| JP2013164623A | ||||
| JP2013037105A | ||||
| JP2012208434A | ||||
| JP2013101316A | ||||
| JP2006251468A | ||||
| JP2013097324A |
Attorney, Agent or Firm:
Sano patent office
Shizuo Sano
Inoue On
Shizuo Sano
Inoue On
Previous Patent: A mesh selecting method for nebulizers, a device, and a program
Next Patent: JPS5928427
Next Patent: JPS5928427