Title:
INFRARED OPTICAL SYSTEM, IMAGING OPTICAL DEVICE AND DIGITAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/195730
Kind Code:
A1
Abstract:
This infrared optical system, which uses a wavelength range of 3-5 µm, comprises, from the object side to the image side, a first lens having negative power and having a concave meniscus shape towards the object side, a second lens having positive power, and a stop, and comprises a bandpass filter between the second lens and the image plane. The first lens is aspherical, the second lens is spherical, and the bandpass filter has the characteristic of transmitting only light of wavelengths 3.1-3.5 µm. This infrared optical system satisfies the conditional expressions -8 < (r1+r2) / (r1-r2) < -7 (r1, r2: radius of curvature of the object-side surface and the image-side surface of the first lens), and 0.7 < (r3+r4) / (r3-r4) < 1.8 (r3, r4: radius of curvature of the object-side surface and the image-side surface of the second lens).
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Inventors:
JIN MAKOTO (JP)
Application Number:
PCT/JP2017/017393
Publication Date:
November 16, 2017
Filing Date:
May 08, 2017
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G02B13/14; G02B13/04; G02B13/18; G03B9/02
Domestic Patent References:
| WO2016027786A1 | 2016-02-25 | |||
| WO2016190243A1 | 2016-12-01 |
Foreign References:
| US20120229892A1 | 2012-09-13 | |||
| JP2013195795A | 2013-09-30 | |||
| CN203502651U | 2014-03-26 | |||
| JP2003185919A | 2003-07-03 |
Attorney, Agent or Firm:
SANO PATENT OFFICE (JP)
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