Title:
IMAGING LENS, IMAGING OPTICAL DEVICE, DIGITAL INSTRUMENT, AND PRODUCTION METHOD FOR IMAGING LENS
Document Type and Number:
WIPO Patent Application WO/2019/098110
Kind Code:
A1
Abstract:
An imaging lens (LN) having, in order from the object side, a first group (Gr1) having a positive power, a second group (Gr2) having a positive power, and a third group (Gr3) having a negative power. During focusing from infinity to a close object: the first group (Gr1) has a fixed position; the second group (Gr2) and the third group (Gr3 ) move such that the gap between the first group (Gr1) and the second group (Gr2) narrows and the gap between the second group (Gr2) and the third group (Gr3) widens; and the conditional formula 1.0 < f1/f < 2.5 is fulfilled (f1: focal length of first group (Gr1), f: focal length of the entire system). As a result, an imaging lens is obtained that: achieves both a bright F value and a reduction in focus group weight; satisfactorily corrects aberrations from the infinite end to the closest end; and can obtain uniform image quality over the entire image.
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Inventors:
YAMADA KEIKO (JP)
IMAJIMA RYOSUKE (JP)
TATSUNO WATARU (JP)
SATO HARUO (JP)
IMAJIMA RYOSUKE (JP)
TATSUNO WATARU (JP)
SATO HARUO (JP)
Application Number:
PCT/JP2018/041421
Publication Date:
May 23, 2019
Filing Date:
November 08, 2018
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B13/00
Domestic Patent References:
| WO2012026069A1 | 2012-03-01 | |||
| WO2018135000A1 | 2018-07-26 |
Foreign References:
| JP2016180851A | 2016-10-13 | |||
| JP2013186458A | 2013-09-19 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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