Title:
IMAGING OPTICAL SYSTEM, IMAGING OPTICAL DEVICE, AND DIGITAL INSTRUMENT
Document Type and Number:
WIPO Patent Application WO/2015/111316
Kind Code:
A1
Abstract:
An imaging optical system has a lens group formed from a plurality of lenses and an IR cut-off filter. At least one lens of the plurality of lenses is an aspherical lens formed from a resin material that includes infrared absorbing material that absorbs infrared rays. The entire lens that includes the infrared absorbing material satisfies: prescribed conditions for the relationship between thickness (physical optical path length) at the light ray center of the nth lens and the weight percent concentration per unit length of absorbing material included in the nth lens; prescribed conditions for the thickness (physical optical path length) of the nth lens in the light path for 0.2 image height, 0.4 image height, 0.6 image height, and 0.8 image height; and prescribed conditions for an infrared cut-off coating at the transmittivity for an angle of incidence of 30°.
Inventors:
JIDAI HIDETAKA (JP)
NAKAMURA KOJI (JP)
MATSUSAKA KEIJI (JP)
NAKAMURA KOJI (JP)
MATSUSAKA KEIJI (JP)
Application Number:
PCT/JP2014/082692
Publication Date:
July 30, 2015
Filing Date:
December 10, 2014
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G02B13/00; G02B5/22; G02B5/26; G02B13/18
Domestic Patent References:
| WO2008072410A1 | 2008-06-19 |
Foreign References:
| JP2011100084A | 2011-05-19 | |||
| JP2004246141A | 2004-09-02 | |||
| JP2008020513A | 2008-01-31 |
Attorney, Agent or Firm:
SANO PATENT OFFICE (JP)
Patent business corporation Sano patent firm (JP)
Patent business corporation Sano patent firm (JP)
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