Title:
LENS SYSTEM AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/244866
Kind Code:
A1
Abstract:
This imaging lens system (10) is configured from a negative refractive power first lens group (G1), a positive refractive power second lens group (G2), a positive refractive power third lens group (G3) and a positive refractive power fourth lens group (G4), arranged in order from the object side (11). When focusing from infinity to very close, the distance (d6) along the optical axis (15) between the first lens group (G1) and the second lens group (G2) increases, the distance (d9) between the second lens group (G2) and the third lens group (G3) decreases, and the fourth lens group (G4) is fixed relative to the image plane (5) as well as to an aperture (St) arranged on the object side (11) of the fourth lens group.
Inventors:
MIYASHITA YUYA (JP)
Application Number:
PCT/JP2019/024030
Publication Date:
December 26, 2019
Filing Date:
June 18, 2019
Export Citation:
Assignee:
NITTOH INC (JP)
International Classes:
G02B13/00; G02B13/18
Domestic Patent References:
| WO2015072245A1 | 2015-05-21 |
Foreign References:
| US20140002910A1 | 2014-01-02 | |||
| JP2001208966A | 2001-08-03 | |||
| JP2004061679A | 2004-02-26 | |||
| JP2011186269A | 2011-09-22 |
Attorney, Agent or Firm:
IMAI, Akira (JP)
Download PDF: