Title:
IMAGE PICKUP OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2014/128828
Kind Code:
A1
Abstract:
Provided is a wide angle image pickup optical system composed of four lenses, the wide angle image pickup optical system that is capable of sufficiently decreasing various types of aberrations including chromatic aberration of magnification. The wide angle image pickup optical system includes the following arranged from the object side to the image plane side: a first lens that is a negative meniscus lens having a convex surface on the object side; a second lens that is negative; a third lens that is positive; an aperture stop; and a fourth lens that is positive , wherein the following expressions are satisfied, where ν2, ν3, and ν4 represent abbe numbers of materials that form the second to fourth lenses with respect to a d-line, respectively, f2 and f3 represent focal distances of the second and third lenses, respectively, and f represents a focal distance of the whole optical system:
ν2>35 (1)
ν3<45 (2)
ν4>35 (3)
ν2-ν3≥10 (4)
ν4-ν3≥10 (5)
-2.3 ≤ f2/f ≤ -1.5 (6)
3.0 ≤ f3/f ≤ 4.0 (7)
Inventors:
KANAI NORIFUMI (JP)
Application Number:
PCT/JP2013/053988
Publication Date:
August 28, 2014
Filing Date:
February 19, 2013
Export Citation:
Assignee:
NALUX CO LTD (JP)
International Classes:
G02B13/04; G02B13/18
Domestic Patent References:
| WO2009066532A1 | 2009-05-28 |
Foreign References:
| JP2010015007A | 2010-01-21 | |||
| JP2011215443A | 2011-10-27 | |||
| JP2011232418A | 2011-11-17 | |||
| JP2002244031A | 2002-08-28 | |||
| JP2005227426A | 2005-08-25 | |||
| JP2006259704A | 2006-09-28 |
Attorney, Agent or Firm:
FUSHIMI, NAOYA (JP)
Naoya Fushimi (JP)
Naoya Fushimi (JP)
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