Title:
OPTICAL SYSTEM, IMAGE CAPTURING DEVICE AND DISTANCE MEASURING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2016/068095
Kind Code:
A1
Abstract:
Provided is a technology that is suitable for both widening an image capture field angle and securing angular resolution over the entire image capturing range. In an image capture optical system of the present invention: the rate of change of the image height per unit field angle, or dy/dθ, is larger than 0 at a maximum field angle θmax; and the rate of change of the field angle per unit image height, or D(θ) = 1/(dy(θ)/dθ), is configured such that θp, which satisfies expression D(θp) > {(D(θmax) - D(0))/ θmaxθ}θp + D(0), lies in a range of 0 <θ <θmax, and such that a switching field angle θs of the rate of change of the field angle per unit image height D(θ) satisfies expression 1.5 < (y(θs)/θs)/{(y(θmax) - y(θs))/(θmax - θs)} < 3.0.
Inventors:
MURATA SEIJI (JP)
BETSUI KEIICHI (JP)
BETSUI KEIICHI (JP)
Application Number:
PCT/JP2015/080155
Publication Date:
May 06, 2016
Filing Date:
October 27, 2015
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
G02B13/00; G01C3/06; G02B7/30; G02B13/18; G03B15/00
Foreign References:
| JP2005110207A | 2005-04-21 | |||
| JP2009058648A | 2009-03-19 | |||
| JP2010003014A | 2010-01-07 | |||
| JP2000221391A | 2000-08-11 | |||
| JP2004354572A | 2004-12-16 | |||
| JP2013045089A | 2013-03-04 |
Other References:
See also references of EP 3214474A4
Attorney, Agent or Firm:
INOUE Manabu et al. (JP)
Manabu Inoue (JP)
Manabu Inoue (JP)
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