Title:
OPTICAL ELEMENT, OPTICAL SYSTEM, AND IMAGE PICKUP DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/115689
Kind Code:
A1
Abstract:
An optical elements, wherein the transmissivity of visible light is reduced from a center portion towards a peripheral portion. Provided is an optical element having the following: a visible light absorbing section that is formed from a material which absorbs some or all of visible light, and the thickness of the visible light absorbing section increases from a center portion towards a peripheral portion; and a visible light transmitting section that is stacked on the visible light absorbing section and is formed from a material which transmits visible light. The abovementioned problem is solved by providing the optical element which is characterized in that in a case where the transmissivity of light having a wavelength of 420nm is T420, the transmissivity of light having a wavelength of 360nm is T360, and the average transmissivity of light having a wavelength from 400nm to 700nm is Tave, T420/T360≥3 in a region where Tave≥50%.
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Inventors:
ISHIDO SO (JP)
NAGAYAMA HIROMICHI (JP)
SHIOYA KENICHI (JP)
HOTAKA HIROKI (JP)
NAGAYAMA HIROMICHI (JP)
SHIOYA KENICHI (JP)
HOTAKA HIROKI (JP)
Application Number:
PCT/JP2014/051012
Publication Date:
July 31, 2014
Filing Date:
January 20, 2014
Export Citation:
Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
G02B5/00; G02B5/22; G03B11/00
Foreign References:
| JP2004536341A | 2004-12-02 | |||
| JP2007219210A | 2007-08-30 | |||
| JP2005266096A | 2005-09-29 | |||
| JP2009521722A | 2009-06-04 | |||
| JP2013254154A | 2013-12-19 |
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
Tadashige Ito (JP)
Tadashige Ito (JP)
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